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abd39a8289
To avoid deadlocking the system it is crucial that all memory allocations performed in the zio_execute() call path are marked KM_PUSHPAGE (GFP_NOFS). This ensures that while a z_wr_iss thread is processing the syncing transaction group it does not re-enter the filesystem code and deadlock on itself. Call Trace: [<ffffffffa02580e8>] cv_wait_common+0x78/0xe0 [spl] [<ffffffffa0347bab>] txg_wait_open+0x7b/0xa0 [zfs] [<ffffffffa030e73d>] dmu_tx_wait+0xed/0xf0 [zfs] [<ffffffffa0376a49>] zfs_putpage+0x219/0x360 [zfs] [<ffffffffa038d75e>] zpl_putpage+0x1e/0x60 [zfs] [<ffffffffa038d7b2>] zpl_writepage+0x12/0x20 [zfs] [<ffffffff8115f907>] writeout+0xa7/0xd0 [<ffffffff8115fa6b>] move_to_new_page+0x13b/0x170 [<ffffffff8115fed4>] migrate_pages+0x434/0x4c0 [<ffffffff811559ab>] compact_zone+0x4fb/0x780 [<ffffffff81155ed1>] compact_zone_order+0xa1/0xe0 [<ffffffff8115602c>] try_to_compact_pages+0x11c/0x190 [<ffffffff811200bb>] __alloc_pages_nodemask+0x5eb/0x8b0 [<ffffffff81159932>] kmem_getpages+0x62/0x170 [<ffffffff8115a54a>] fallback_alloc+0x1ba/0x270 [<ffffffff8115a2c9>] ____cache_alloc_node+0x99/0x160 [<ffffffff8115b059>] __kmalloc+0x189/0x220 [<ffffffffa02539fb>] kmem_alloc_debug+0xeb/0x130 [spl] [<ffffffffa031454a>] dnode_hold_impl+0x46a/0x550 [zfs] [<ffffffffa0314649>] dnode_hold+0x19/0x20 [zfs] [<ffffffffa03042e3>] dmu_read+0x33/0x180 [zfs] [<ffffffffa034729d>] space_map_load+0xfd/0x320 [zfs] [<ffffffffa03300bc>] metaslab_activate+0x10c/0x170 [zfs] [<ffffffffa0330ad9>] metaslab_alloc+0x469/0x800 [zfs] [<ffffffffa038963c>] zio_dva_allocate+0x6c/0x2f0 [zfs] [<ffffffffa038a249>] zio_execute+0x99/0xf0 [zfs] [<ffffffffa0254b1c>] taskq_thread+0x1cc/0x330 [spl] [<ffffffff8108ddf6>] kthread+0x96/0xa0 Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Issue #291 |
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| Makefile.in | ||