Backport deadlock fix for issue ZOL#7939
A deadlock issue got fixed upstream and merged into master [0]. This patch backports the fix by splitting it into the parts for SPL and ZFS. [0] https://github.com/zfsonlinux/zfs/pull/7939 Signed-off-by: Stoiko Ivanov <s.ivanov@proxmox.com>
This commit is contained in:
Stoiko Ivanov
Thomas Lamprecht
parent
ff03aa2dfd
commit
1bb9f57dcf
@ -0,0 +1,42 @@
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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: ilbsmart <wgqimut@gmail.com>
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Date: Wed, 17 Oct 2018 02:11:24 +0800
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Subject: [PATCH] deadlock between mm_sem and tx assign in zfs_write() and page
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fault
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The bug time sequence:
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1. thread #1, `zfs_write` assign a txg "n".
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2. In a same process, thread #2, mmap page fault (which means the
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`mm_sem` is hold) occurred, `zfs_dirty_inode` open a txg failed,
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and wait previous txg "n" completed.
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3. thread #1 call `uiomove` to write, however page fault is occurred
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in `uiomove`, which means it need `mm_sem`, but `mm_sem` is hold by
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thread #2, so it stuck and can't complete, then txg "n" will
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not complete.
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So thread #1 and thread #2 are deadlocked.
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Reviewed-by: Chunwei Chen <tuxoko@gmail.com>
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Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
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Reviewed-by: Matthew Ahrens <mahrens@delphix.com>
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Signed-off-by: Grady Wong <grady.w@xtaotech.com>
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Closes #7939
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(backported from: zfs-upstream 779a6c0bf6df76e0dd92c1ccf81f48512b835bb0)
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Signed-off-by: Stoiko Ivanov <s.ivanov@proxmox.com>
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---
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include/sys/uio.h | 1 +
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1 file changed, 1 insertion(+)
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diff --git a/include/sys/uio.h b/include/sys/uio.h
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index 764beb9..2895690 100644
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--- a/include/sys/uio.h
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+++ b/include/sys/uio.h
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@@ -53,6 +53,7 @@ typedef struct uio {
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int uio_iovcnt;
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offset_t uio_loffset;
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uio_seg_t uio_segflg;
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+ boolean_t uio_fault_disable;
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uint16_t uio_fmode;
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uint16_t uio_extflg;
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offset_t uio_limit;
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@ -1 +1,2 @@
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0001-remove-DKMS-and-module-build.patch
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0001-remove-DKMS-and-module-build.patch
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0002-deadlock-between-mm_sem-and-tx-assign-in-zfs_write-a.patch
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@ -0,0 +1,376 @@
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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: ilbsmart <wgqimut@gmail.com>
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Date: Wed, 17 Oct 2018 02:11:24 +0800
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Subject: [PATCH] deadlock between mm_sem and tx assign in zfs_write() and page
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fault
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The bug time sequence:
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1. thread #1, `zfs_write` assign a txg "n".
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2. In a same process, thread #2, mmap page fault (which means the
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`mm_sem` is hold) occurred, `zfs_dirty_inode` open a txg failed,
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and wait previous txg "n" completed.
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3. thread #1 call `uiomove` to write, however page fault is occurred
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in `uiomove`, which means it need `mm_sem`, but `mm_sem` is hold by
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thread #2, so it stuck and can't complete, then txg "n" will
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not complete.
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So thread #1 and thread #2 are deadlocked.
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Reviewed-by: Chunwei Chen <tuxoko@gmail.com>
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Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
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Reviewed-by: Matthew Ahrens <mahrens@delphix.com>
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Signed-off-by: Grady Wong <grady.w@xtaotech.com>
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Closes #7939
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(backported from: zfs-upstream 779a6c0bf6df76e0dd92c1ccf81f48512b835bb0)
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Signed-off-by: Stoiko Ivanov <s.ivanov@proxmox.com>
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---
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include/sys/uio_impl.h | 2 +-
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module/zcommon/zfs_uio.c | 31 ++++-
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module/zfs/zfs_vnops.c | 24 +++-
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tests/zfs-tests/cmd/mmapwrite/mmapwrite.c | 140 +++++++++++++++------
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.../tests/functional/mmap/mmap_write_001_pos.ksh | 8 +-
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5 files changed, 151 insertions(+), 54 deletions(-)
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diff --git a/include/sys/uio_impl.h b/include/sys/uio_impl.h
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index 37e283da..cfef0b95 100644
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--- a/include/sys/uio_impl.h
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+++ b/include/sys/uio_impl.h
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@@ -42,7 +42,7 @@
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#include <sys/uio.h>
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extern int uiomove(void *, size_t, enum uio_rw, uio_t *);
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-extern void uio_prefaultpages(ssize_t, uio_t *);
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+extern int uio_prefaultpages(ssize_t, uio_t *);
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extern int uiocopy(void *, size_t, enum uio_rw, uio_t *, size_t *);
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extern void uioskip(uio_t *, size_t);
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diff --git a/module/zcommon/zfs_uio.c b/module/zcommon/zfs_uio.c
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index 7b4175bb..8e969bbc 100644
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--- a/module/zcommon/zfs_uio.c
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+++ b/module/zcommon/zfs_uio.c
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@@ -50,6 +50,7 @@
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#include <sys/types.h>
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#include <sys/uio_impl.h>
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#include <linux/kmap_compat.h>
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+#include <linux/uaccess.h>
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/*
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* Move "n" bytes at byte address "p"; "rw" indicates the direction
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@@ -77,8 +78,24 @@ uiomove_iov(void *p, size_t n, enum uio_rw rw, struct uio *uio)
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if (copy_to_user(iov->iov_base+skip, p, cnt))
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return (EFAULT);
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} else {
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- if (copy_from_user(p, iov->iov_base+skip, cnt))
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- return (EFAULT);
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+ if (uio->uio_fault_disable) {
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+ if (!access_ok(VERIFY_READ,
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+ (iov->iov_base + skip), cnt)) {
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+ return (EFAULT);
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+ }
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+
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+ pagefault_disable();
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+ if (__copy_from_user_inatomic(p,
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+ (iov->iov_base + skip), cnt)) {
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+ pagefault_enable();
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+ return (EFAULT);
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+ }
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+ pagefault_enable();
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+ } else {
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+ if (copy_from_user(p,
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+ (iov->iov_base + skip), cnt))
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+ return (EFAULT);
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+ }
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}
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break;
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case UIO_SYSSPACE:
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@@ -156,7 +173,7 @@ EXPORT_SYMBOL(uiomove);
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* error will terminate the process as this is only a best attempt to get
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* the pages resident.
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*/
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-void
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+int
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uio_prefaultpages(ssize_t n, struct uio *uio)
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{
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const struct iovec *iov;
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@@ -170,7 +187,7 @@ uio_prefaultpages(ssize_t n, struct uio *uio)
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switch (uio->uio_segflg) {
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case UIO_SYSSPACE:
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case UIO_BVEC:
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- return;
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+ return (0);
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case UIO_USERSPACE:
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case UIO_USERISPACE:
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break;
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@@ -194,7 +211,7 @@ uio_prefaultpages(ssize_t n, struct uio *uio)
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p = iov->iov_base + skip;
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while (cnt) {
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if (fuword8((uint8_t *)p, &tmp))
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- return;
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+ return (EFAULT);
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incr = MIN(cnt, PAGESIZE);
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p += incr;
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cnt -= incr;
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@@ -204,8 +221,10 @@ uio_prefaultpages(ssize_t n, struct uio *uio)
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*/
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p--;
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if (fuword8((uint8_t *)p, &tmp))
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- return;
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+ return (EFAULT);
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}
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+
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+ return (0);
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}
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EXPORT_SYMBOL(uio_prefaultpages);
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diff --git a/module/zfs/zfs_vnops.c b/module/zfs/zfs_vnops.c
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index 5a2e55eb..c866352d 100644
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--- a/module/zfs/zfs_vnops.c
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+++ b/module/zfs/zfs_vnops.c
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@@ -675,7 +675,10 @@ zfs_write(struct inode *ip, uio_t *uio, int ioflag, cred_t *cr)
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xuio = (xuio_t *)uio;
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else
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#endif
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- uio_prefaultpages(MIN(n, max_blksz), uio);
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+ if (uio_prefaultpages(MIN(n, max_blksz), uio)) {
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+ ZFS_EXIT(zfsvfs);
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+ return (SET_ERROR(EFAULT));
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+ }
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/*
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* If in append mode, set the io offset pointer to eof.
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@@ -820,8 +823,19 @@ zfs_write(struct inode *ip, uio_t *uio, int ioflag, cred_t *cr)
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if (abuf == NULL) {
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tx_bytes = uio->uio_resid;
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+ uio->uio_fault_disable = B_TRUE;
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error = dmu_write_uio_dbuf(sa_get_db(zp->z_sa_hdl),
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uio, nbytes, tx);
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+ if (error == EFAULT) {
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+ dmu_tx_commit(tx);
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+ if (uio_prefaultpages(MIN(n, max_blksz), uio)) {
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+ break;
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+ }
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+ continue;
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+ } else if (error != 0) {
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+ dmu_tx_commit(tx);
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+ break;
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+ }
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tx_bytes -= uio->uio_resid;
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} else {
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tx_bytes = nbytes;
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@@ -921,8 +935,12 @@ zfs_write(struct inode *ip, uio_t *uio, int ioflag, cred_t *cr)
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ASSERT(tx_bytes == nbytes);
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n -= nbytes;
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- if (!xuio && n > 0)
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- uio_prefaultpages(MIN(n, max_blksz), uio);
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+ if (!xuio && n > 0) {
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+ if (uio_prefaultpages(MIN(n, max_blksz), uio)) {
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+ error = EFAULT;
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+ break;
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+ }
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+ }
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}
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zfs_inode_update(zp);
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diff --git a/tests/zfs-tests/cmd/mmapwrite/mmapwrite.c b/tests/zfs-tests/cmd/mmapwrite/mmapwrite.c
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index 190d31af..b9915d5d 100644
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--- a/tests/zfs-tests/cmd/mmapwrite/mmapwrite.c
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+++ b/tests/zfs-tests/cmd/mmapwrite/mmapwrite.c
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@@ -31,74 +31,132 @@
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#include <string.h>
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#include <sys/mman.h>
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#include <pthread.h>
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+#include <errno.h>
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+#include <err.h>
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/*
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* --------------------------------------------------------------------
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- * Bug Id: 5032643
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+ * Bug Issue Id: #7512
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+ * The bug time sequence:
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+ * 1. context #1, zfs_write assign a txg "n".
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+ * 2. In the same process, context #2, mmap page fault (which means the mm_sem
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+ * is hold) occurred, zfs_dirty_inode open a txg failed, and wait previous
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+ * txg "n" completed.
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+ * 3. context #1 call uiomove to write, however page fault is occurred in
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+ * uiomove, which means it need mm_sem, but mm_sem is hold by
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+ * context #2, so it stuck and can't complete, then txg "n" will not
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+ * complete.
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*
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- * Simply writing to a file and mmaping that file at the same time can
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- * result in deadlock. Nothing perverse like writing from the file's
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- * own mapping is required.
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+ * So context #1 and context #2 trap into the "dead lock".
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* --------------------------------------------------------------------
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*/
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+#define NORMAL_WRITE_TH_NUM 2
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+
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static void *
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-mapper(void *fdp)
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+normal_writer(void *filename)
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{
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- void *addr;
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- int fd = *(int *)fdp;
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+ char *file_path = filename;
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+ int fd = -1;
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+ ssize_t write_num = 0;
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+ int page_size = getpagesize();
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|
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|
- if ((addr =
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- mmap(0, 8192, PROT_READ, MAP_SHARED, fd, 0)) == MAP_FAILED) {
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|
- perror("mmap");
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|
- exit(1);
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|
+ fd = open(file_path, O_RDWR | O_CREAT, 0777);
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|
+ if (fd == -1) {
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|
+ err(1, "failed to open %s", file_path);
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|
}
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|
- for (;;) {
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|
- if (mmap(addr, 8192, PROT_READ,
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|
- MAP_SHARED|MAP_FIXED, fd, 0) == MAP_FAILED) {
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|
- perror("mmap");
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|
- exit(1);
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|
+
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|
+ char *buf = malloc(1);
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|
+ while (1) {
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|
+ write_num = write(fd, buf, 1);
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|
+ if (write_num == 0) {
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|
+ err(1, "write failed!");
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|
+ break;
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|
}
|
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|
+ lseek(fd, page_size, SEEK_CUR);
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|
+ }
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|
+
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|
+ if (buf) {
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|
+ free(buf);
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|
}
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|
- /* NOTREACHED */
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|
- return ((void *)1);
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|
}
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|
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|
-int
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|
-main(int argc, char **argv)
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|
+static void *
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|
+map_writer(void *filename)
|
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|
{
|
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|
- int fd;
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|
- char buf[1024];
|
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|
- pthread_t tid;
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|
+ int fd = -1;
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|
+ int ret = 0;
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|
+ char *buf = NULL;
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|
+ int page_size = getpagesize();
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|
+ int op_errno = 0;
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|
+ char *file_path = filename;
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|
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|
- memset(buf, 'a', sizeof (buf));
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|
+ while (1) {
|
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|
+ ret = access(file_path, F_OK);
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|
+ if (ret) {
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|
+ op_errno = errno;
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|
+ if (op_errno == ENOENT) {
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|
+ fd = open(file_path, O_RDWR | O_CREAT, 0777);
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|
+ if (fd == -1) {
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|
+ err(1, "open file failed");
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|
+ }
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|
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|
- if (argc != 2) {
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|
- (void) printf("usage: %s <file name>\n", argv[0]);
|
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|
- exit(1);
|
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|
- }
|
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|
+ ret = ftruncate(fd, page_size);
|
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|
+ if (ret == -1) {
|
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|
+ err(1, "truncate file failed");
|
||||||
|
+ }
|
||||||
|
+ } else {
|
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|
+ err(1, "access file failed!");
|
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|
+ }
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|
+ } else {
|
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|
+ fd = open(file_path, O_RDWR, 0777);
|
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|
+ if (fd == -1) {
|
||||||
|
+ err(1, "open file failed");
|
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|
+ }
|
||||||
|
+ }
|
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|
|
||||||
|
- if ((fd = open(argv[1], O_RDWR|O_CREAT|O_TRUNC, 0666)) == -1) {
|
||||||
|
- perror("open");
|
||||||
|
- exit(1);
|
||||||
|
+ if ((buf = mmap(NULL, page_size, PROT_READ | PROT_WRITE,
|
||||||
|
+ MAP_SHARED, fd, 0)) == MAP_FAILED) {
|
||||||
|
+ err(1, "map file failed");
|
||||||
|
+ }
|
||||||
|
+
|
||||||
|
+ if (fd != -1)
|
||||||
|
+ close(fd);
|
||||||
|
+
|
||||||
|
+ char s[10] = {0, };
|
||||||
|
+ memcpy(buf, s, 10);
|
||||||
|
+ ret = munmap(buf, page_size);
|
||||||
|
+ if (ret != 0) {
|
||||||
|
+ err(1, "unmap file failed");
|
||||||
|
+ }
|
||||||
|
}
|
||||||
|
+}
|
||||||
|
|
||||||
|
- (void) pthread_setconcurrency(2);
|
||||||
|
- if (pthread_create(&tid, NULL, mapper, &fd) != 0) {
|
||||||
|
- perror("pthread_create");
|
||||||
|
- close(fd);
|
||||||
|
+int
|
||||||
|
+main(int argc, char **argv)
|
||||||
|
+{
|
||||||
|
+ pthread_t map_write_tid;
|
||||||
|
+ pthread_t normal_write_tid[NORMAL_WRITE_TH_NUM];
|
||||||
|
+ int i = 0;
|
||||||
|
+
|
||||||
|
+ if (argc != 3) {
|
||||||
|
+ (void) printf("usage: %s <normal write file name>"
|
||||||
|
+ "<map write file name>\n", argv[0]);
|
||||||
|
exit(1);
|
||||||
|
}
|
||||||
|
- for (;;) {
|
||||||
|
- if (write(fd, buf, sizeof (buf)) == -1) {
|
||||||
|
- perror("write");
|
||||||
|
- close(fd);
|
||||||
|
- exit(1);
|
||||||
|
+
|
||||||
|
+ for (i = 0; i < NORMAL_WRITE_TH_NUM; i++) {
|
||||||
|
+ if (pthread_create(&normal_write_tid[i], NULL, normal_writer,
|
||||||
|
+ argv[1])) {
|
||||||
|
+ err(1, "pthread_create normal_writer failed.");
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
- close(fd);
|
||||||
|
+ if (pthread_create(&map_write_tid, NULL, map_writer, argv[2])) {
|
||||||
|
+ err(1, "pthread_create map_writer failed.");
|
||||||
|
+ }
|
||||||
|
|
||||||
|
/* NOTREACHED */
|
||||||
|
+ pthread_join(map_write_tid, NULL);
|
||||||
|
return (0);
|
||||||
|
}
|
||||||
|
diff --git a/tests/zfs-tests/tests/functional/mmap/mmap_write_001_pos.ksh b/tests/zfs-tests/tests/functional/mmap/mmap_write_001_pos.ksh
|
||||||
|
index 1eda9710..24150b82 100755
|
||||||
|
--- a/tests/zfs-tests/tests/functional/mmap/mmap_write_001_pos.ksh
|
||||||
|
+++ b/tests/zfs-tests/tests/functional/mmap/mmap_write_001_pos.ksh
|
||||||
|
@@ -53,12 +53,14 @@ if ! is_mp; then
|
||||||
|
fi
|
||||||
|
|
||||||
|
log_must chmod 777 $TESTDIR
|
||||||
|
-mmapwrite $TESTDIR/test-write-file &
|
||||||
|
+mmapwrite $TESTDIR/normal_write_file $TESTDIR/map_write_file &
|
||||||
|
PID_MMAPWRITE=$!
|
||||||
|
-log_note "mmapwrite $TESTDIR/test-write-file pid: $PID_MMAPWRITE"
|
||||||
|
+log_note "mmapwrite $TESTDIR/normal_write_file $TESTDIR/map_write_file"\
|
||||||
|
+ "pid: $PID_MMAPWRITE"
|
||||||
|
log_must sleep 30
|
||||||
|
|
||||||
|
log_must kill -9 $PID_MMAPWRITE
|
||||||
|
-log_must ls -l $TESTDIR/test-write-file
|
||||||
|
+log_must ls -l $TESTDIR/normal_write_file
|
||||||
|
+log_must ls -l $TESTDIR/map_write_file
|
||||||
|
|
||||||
|
log_pass "write(2) a mmap(2)'ing file succeeded."
|
||||||
@ -4,3 +4,4 @@
|
|||||||
0004-Fix-deadlock-between-zfs-umount-snapentry_expire.patch
|
0004-Fix-deadlock-between-zfs-umount-snapentry_expire.patch
|
||||||
0005-Fix-race-in-dnode_check_slots_free.patch
|
0005-Fix-race-in-dnode_check_slots_free.patch
|
||||||
0006-Reduce-taskq-and-context-switch-cost-of-zio-pipe.patch
|
0006-Reduce-taskq-and-context-switch-cost-of-zio-pipe.patch
|
||||||
|
0007-deadlock-between-mm_sem-and-tx-assign-in-zfs_write-a.patch
|
||||||
|
|||||||
Loading…
Reference in New Issue
Block a user