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Skip dbuf_evict_one() from dbuf_evict_notify() for reclaim thread

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Avoid calling dbuf_evict_one() from memory reclaim contexts (e.g. Linux
kswapd, FreeBSD pagedaemon). This prevents deadlock caused by reclaim
threads waiting for the dbuf hash lock in the call sequence:
dbuf_evict_one -> dbuf_destroy -> arc_buf_destroy

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Alexander Motin <alexander.motin@TrueNAS.com>
Signed-off-by: Kaitlin Hoang <kthoang@amazon.com>
Closes #17561
This commit is contained in:
khoang98
2025-08-01 19:47:41 -04:00
committed by Tony Hutter
parent 46bc182a5d
commit 3a8e23d0f8
6 changed files with 46 additions and 1 deletions
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include/sys/zfs_context.h
+5
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@@ -235,6 +235,11 @@ typedef pthread_t kthread_t;
#define thread_join(t) pthread_join((pthread_t)(t), NULL)
#define newproc(f, a, cid, pri, ctp, pid) (ENOSYS)
/*
* Check if the current thread is a memory reclaim thread.
* Always returns false in userspace (no memory reclaim thread).
*/
#define current_is_reclaim_thread() (0)
/* in libzpool, p0 exists only to have its address taken */
typedef struct proc {