Hi,
Jut done upgrade on my laptop to the latest Fedora rawhide packages.
After reboot and login in dmesg I found logged btrfs issue:
[ 94.192907] ======================================================
[ 94.192911] WARNING: possible circular locking dependency detected
[ 94.192917] 4.15.0-0.rc2.git2.1.fc28.x86_64 #1 Not tainted
[ 94.192921] ------------------------------------------------------
[ 94.192926] mysqld/1225 is trying to acquire lock:
[ 94.192930] (&mm->mmap_sem){++++}, at: [<0000000065e31c80>]
get_user_pages_unlocked+0x5b/0x1b0
[ 94.192955]
but task is already holding lock:
[ 94.192962] (&ei->dio_sem){++++}, at: [<0000000008becadb>]
btrfs_direct_IO+0x395/0x410 [btrfs]
[ 94.193059]
which lock already depends on the new lock.
[ 94.193069]
the existing dependency chain (in reverse order) is:
[ 94.193076]
-> #4 (&ei->dio_sem){++++}:
[ 94.193102] down_write+0x4d/0xb0
[ 94.193183] btrfs_log_changed_extents+0x7c/0x680 [btrfs]
[ 94.193261] btrfs_log_inode+0x9c0/0x11a0 [btrfs]
[ 94.193326] btrfs_log_inode_parent+0x2d7/0xaa0 [btrfs]
[ 94.193395] btrfs_log_dentry_safe+0x58/0x80 [btrfs]
[ 94.193466] btrfs_sync_file+0x332/0x4e0 [btrfs]
[ 94.193477] do_fsync+0x38/0x60
[ 94.193484] SyS_fsync+0xc/0x10
[ 94.193493] do_syscall_64+0x66/0x210
[ 94.193501] return_from_SYSCALL_64+0x0/0x75
[ 94.193505]
-> #3 (&ei->log_mutex){+.+.}:
[ 94.193519] __mutex_lock+0x7f/0xa40
[ 94.193563] btrfs_log_inode+0x162/0x11a0 [btrfs]
[ 94.193604] btrfs_log_inode_parent+0x2d7/0xaa0 [btrfs]
[ 94.193646] btrfs_log_dentry_safe+0x58/0x80 [btrfs]
[ 94.193692] btrfs_sync_file+0x332/0x4e0 [btrfs]
[ 94.193698] do_fsync+0x38/0x60
[ 94.193705] SyS_fsync+0xc/0x10
[ 94.193711] do_syscall_64+0x66/0x210
[ 94.193718] return_from_SYSCALL_64+0x0/0x75
[ 94.193721]
-> #2 (sb_internal){.+.+}:
[ 94.193737] debug_check_no_obj_freed+0xde/0x248
[ 94.193740]
-> #1 ((completion)&async->wait){+.+.}:
[ 94.193753] wait_for_completion+0x63/0x1e0
[ 94.193792] btrfs_async_run_delayed_refs+0x14b/0x170 [btrfs]
[ 94.193837] __btrfs_end_transaction+0x1ee/0x2e0 [btrfs]
[ 94.193881] btrfs_dirty_inode+0x6a/0xd0 [btrfs]
[ 94.193891] touch_atime+0xab/0xd0
[ 94.193934] btrfs_file_mmap+0x3f/0x60 [btrfs]
[ 94.193942] mmap_region+0x3ac/0x5e0
[ 94.193949] do_mmap+0x2e1/0x450
[ 94.193959] vm_mmap_pgoff+0xd5/0x120
[ 94.193966] SyS_mmap_pgoff+0x1c2/0x250
[ 94.193973] entry_SYSCALL_64_fastpath+0x1f/0x96
[ 94.193976]
-> #0 (&mm->mmap_sem){++++}:
[ 94.193990] lock_acquire+0x9f/0x1f0
[ 94.193995] down_read+0x44/0xa0
[ 94.194001] get_user_pages_unlocked+0x5b/0x1b0
[ 94.194006] get_user_pages_fast+0xcf/0x140
[ 94.194014] iov_iter_get_pages+0xc5/0x2f0
[ 94.194021] do_blockdev_direct_IO+0x193c/0x2950
[ 94.194065] btrfs_direct_IO+0x166/0x410 [btrfs]
[ 94.194074] generic_file_direct_write+0x9d/0x160
[ 94.194117] btrfs_file_write_iter+0x300/0x650 [btrfs]
[ 94.194125] aio_write+0x116/0x1a0
[ 94.194132] do_io_submit+0x42d/0x940
[ 94.194139] entry_SYSCALL_64_fastpath+0x1f/0x96
[ 94.194142]
other info that might help us debug this:
[ 94.194147] Chain exists of:
&mm->mmap_sem --> &ei->log_mutex --> &ei->dio_sem
[ 94.194162] Possible unsafe locking scenario:
[ 94.194166] CPU0 CPU1
[ 94.194169] ---- ----
[ 94.194172] lock(&ei->dio_sem);
[ 94.194178] lock(&ei->log_mutex);
[ 94.194184] lock(&ei->dio_sem);
[ 94.194190] lock(&mm->mmap_sem);
[ 94.194196]
*** DEADLOCK ***
[ 94.194202] 2 locks held by mysqld/1225:
[ 94.194205] #0: (sb_writers#10){.+.+}, at: [<00000000164669fb>]
aio_write+0x191/0x1a0
[ 94.194220] #1: (&ei->dio_sem){++++}, at: [<0000000008becadb>]
btrfs_direct_IO+0x395/0x410 [btrfs]
[ 94.194268]
stack backtrace:
[ 94.194276] CPU: 1 PID: 1225 Comm: mysqld Not tainted
4.15.0-0.rc2.git2.1.fc28.x86_64 #1
[ 94.194281] Hardware name: Sony Corporation VPCSB2M9E/VAIO, BIOS
R2087H4 06/15/2012
[ 94.194285] Call Trace:
[ 94.194296] dump_stack+0x85/0xbf
[ 94.194304] print_circular_bug+0x1f5/0x2e0
[ 94.194315] ? copy_trace+0x80/0x80
[ 94.194320] check_prev_add+0x3da/0x780
[ 94.194332] ? __lock_acquire+0x11e9/0x1270
[ 94.194338] __lock_acquire+0x11e9/0x1270
[ 94.194349] lock_acquire+0x9f/0x1f0
[ 94.194355] ? get_user_pages_unlocked+0x5b/0x1b0
[ 94.194365] down_read+0x44/0xa0
[ 94.194371] ? get_user_pages_unlocked+0x5b/0x1b0
[ 94.194376] get_user_pages_unlocked+0x5b/0x1b0
[ 94.194383] ? mark_held_locks+0x4e/0x80
[ 94.194391] get_user_pages_fast+0xcf/0x140
[ 94.194400] iov_iter_get_pages+0xc5/0x2f0
[ 94.194411] do_blockdev_direct_IO+0x193c/0x2950
[ 94.194417] ? __lock_acquire+0x2c3/0x1270
[ 94.194460] ? btrfs_endio_direct_read+0xb0/0xb0 [btrfs]
[ 94.194504] ? btrfs_page_exists_in_range+0x310/0x310 [btrfs]
[ 94.194552] ? btrfs_page_exists_in_range+0x310/0x310 [btrfs]
[ 94.194591] ? btrfs_endio_direct_read+0xb0/0xb0 [btrfs]
[ 94.194633] ? btrfs_direct_IO+0x166/0x410 [btrfs]
[ 94.194669] btrfs_direct_IO+0x166/0x410 [btrfs]
[ 94.194706] ? btrfs_endio_direct_read+0xb0/0xb0 [btrfs]
[ 94.194718] generic_file_direct_write+0x9d/0x160
[ 94.194763] btrfs_file_write_iter+0x300/0x650 [btrfs]
[ 94.194776] aio_write+0x116/0x1a0
[ 94.194787] ? __might_fault+0x3e/0x90
[ 94.194797] ? do_io_submit+0x42d/0x940
[ 94.194804] do_io_submit+0x42d/0x940
[ 94.194819] ? entry_SYSCALL_64_fastpath+0x1f/0x96
[ 94.194826] entry_SYSCALL_64_fastpath+0x1f/0x96
[ 94.194833] RIP: 0033:0x7f7e2d309687
[ 94.194837] RSP: 002b:00007f7e10ce34a8 EFLAGS: 00000206 ORIG_RAX:
00000000000000d1
[ 94.194844] RAX: ffffffffffffffda RBX: 00007f7e186a8000 RCX: 00007f7e2d309687
[ 94.194849] RDX: 00007f7e10ce34b0 RSI: 0000000000000001 RDI: 00007f7e24ddb000
[ 94.194853] RBP: 00007f7e10ce3830 R08: 00007f7e10ce34b0 R09: 0000000000000400
[ 94.194857] R10: 0000000000000000 R11: 0000000000000206 R12: 00007f7e17d18c50
[ 94.194861] R13: 0000561dfbb5d028 R14: 000000185b3a7525 R15: 0000000000000001
kloczek
--
Tomasz Kłoczko | LinkedIn: http://lnkd.in/FXPWxH
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