* [syzbot] [ocfs2?] possible deadlock in ocfs2_evict_inode (2)
@ 2026-07-20 5:05 syzbot
0 siblings, 0 replies; only message in thread
From: syzbot @ 2026-07-20 5:05 UTC (permalink / raw)
To: jlbec, joseph.qi, linux-kernel, mark, ocfs2-devel, syzkaller-bugs
Hello,
syzbot found the following issue on:
HEAD commit: 58717b2a1365 Merge tag 'sound-7.2-rc4' of git://git.kernel..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=100354b9580000
kernel config: https://syzkaller.appspot.com/x/.config?x=20c9876b0f77b546
dashboard link: https://syzkaller.appspot.com/bug?extid=99ed7f9e22e83c1eaea1
compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-58717b2a.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/c55a804d84b6/vmlinux-58717b2a.xz
kernel image: https://storage.googleapis.com/syzbot-assets/9e654c04764e/bzImage-58717b2a.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+99ed7f9e22e83c1eaea1@syzkaller.appspotmail.com
======================================================
WARNING: possible circular locking dependency detected
syzkaller #0 Not tainted
------------------------------------------------------
kswapd0/70 is trying to acquire lock:
ffff8880444617a0 (&ocfs2_sysfile_lock_key[INODE_ALLOC_SYSTEM_INODE]){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:1024 [inline]
ffff8880444617a0 (&ocfs2_sysfile_lock_key[INODE_ALLOC_SYSTEM_INODE]){+.+.}-{4:4}, at: ocfs2_remove_inode fs/ocfs2/inode.c:767 [inline]
ffff8880444617a0 (&ocfs2_sysfile_lock_key[INODE_ALLOC_SYSTEM_INODE]){+.+.}-{4:4}, at: ocfs2_wipe_inode fs/ocfs2/inode.c:930 [inline]
ffff8880444617a0 (&ocfs2_sysfile_lock_key[INODE_ALLOC_SYSTEM_INODE]){+.+.}-{4:4}, at: ocfs2_delete_inode fs/ocfs2/inode.c:1191 [inline]
ffff8880444617a0 (&ocfs2_sysfile_lock_key[INODE_ALLOC_SYSTEM_INODE]){+.+.}-{4:4}, at: ocfs2_evict_inode+0x1489/0x4390 fs/ocfs2/inode.c:1333
but task is already holding lock:
ffff8880444633a0 (&ocfs2_sysfile_lock_key[ORPHAN_DIR_SYSTEM_INODE]){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:1024 [inline]
ffff8880444633a0 (&ocfs2_sysfile_lock_key[ORPHAN_DIR_SYSTEM_INODE]){+.+.}-{4:4}, at: ocfs2_wipe_inode fs/ocfs2/inode.c:888 [inline]
ffff8880444633a0 (&ocfs2_sysfile_lock_key[ORPHAN_DIR_SYSTEM_INODE]){+.+.}-{4:4}, at: ocfs2_delete_inode fs/ocfs2/inode.c:1191 [inline]
ffff8880444633a0 (&ocfs2_sysfile_lock_key[ORPHAN_DIR_SYSTEM_INODE]){+.+.}-{4:4}, at: ocfs2_evict_inode+0xe39/0x4390 fs/ocfs2/inode.c:1333
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #3 (&ocfs2_sysfile_lock_key[ORPHAN_DIR_SYSTEM_INODE]){+.+.}-{4:4}:
down_write+0x96/0x200 kernel/locking/rwsem.c:1631
inode_lock include/linux/fs.h:1024 [inline]
ocfs2_wipe_inode fs/ocfs2/inode.c:888 [inline]
ocfs2_delete_inode fs/ocfs2/inode.c:1191 [inline]
ocfs2_evict_inode+0xe39/0x4390 fs/ocfs2/inode.c:1333
evict+0x624/0xb50 fs/inode.c:825
ocfs2_dentry_iput+0x24d/0x390 fs/ocfs2/dcache.c:407
dentry_kill+0x1b9/0x880 fs/dcache.c:826
shrink_kill fs/dcache.c:1275 [inline]
shrink_dentry_list+0x209/0x310 fs/dcache.c:1292
prune_dcache_sb+0x119/0x180 fs/dcache.c:1374
super_cache_scan+0x35c/0x4a0 fs/super.c:223
do_shrink_slab+0x6d0/0x10e0 mm/shrinker.c:443
shrink_slab_memcg mm/shrinker.c:560 [inline]
shrink_slab+0x838/0x1220 mm/shrinker.c:638
shrink_one+0x2a2/0x730 mm/vmscan.c:5026
shrink_many mm/vmscan.c:5087 [inline]
lru_gen_shrink_node mm/vmscan.c:5165 [inline]
shrink_node+0x3303/0x3b60 mm/vmscan.c:6154
kswapd_shrink_node mm/vmscan.c:7008 [inline]
balance_pgdat mm/vmscan.c:7186 [inline]
kswapd+0x17b6/0x31c0 mm/vmscan.c:7462
kthread+0x388/0x470 kernel/kthread.c:436
ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
-> #2 (&osb->nfs_sync_rwlock){.+.+}-{4:4}:
down_read+0x4a/0x330 kernel/locking/rwsem.c:1574
ocfs2_nfs_sync_lock+0x106/0x270 fs/ocfs2/dlmglue.c:2875
ocfs2_delete_inode fs/ocfs2/inode.c:1142 [inline]
ocfs2_evict_inode+0x3a6/0x4390 fs/ocfs2/inode.c:1333
evict+0x624/0xb50 fs/inode.c:825
ocfs2_dentry_iput+0x24d/0x390 fs/ocfs2/dcache.c:407
dentry_kill+0x1b9/0x880 fs/dcache.c:826
shrink_kill fs/dcache.c:1275 [inline]
shrink_dentry_list+0x209/0x310 fs/dcache.c:1292
prune_dcache_sb+0x119/0x180 fs/dcache.c:1374
super_cache_scan+0x35c/0x4a0 fs/super.c:223
do_shrink_slab+0x6d0/0x10e0 mm/shrinker.c:443
shrink_slab_memcg mm/shrinker.c:560 [inline]
shrink_slab+0x838/0x1220 mm/shrinker.c:638
shrink_one+0x2a2/0x730 mm/vmscan.c:5026
shrink_many mm/vmscan.c:5087 [inline]
lru_gen_shrink_node mm/vmscan.c:5165 [inline]
shrink_node+0x3303/0x3b60 mm/vmscan.c:6154
kswapd_shrink_node mm/vmscan.c:7008 [inline]
balance_pgdat mm/vmscan.c:7186 [inline]
kswapd+0x17b6/0x31c0 mm/vmscan.c:7462
kthread+0x388/0x470 kernel/kthread.c:436
ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
-> #1 (fs_reclaim){+.+.}-{0:0}:
__fs_reclaim_acquire mm/page_alloc.c:4329 [inline]
fs_reclaim_acquire+0x71/0x100 mm/page_alloc.c:4343
might_alloc include/linux/sched/mm.h:317 [inline]
slab_pre_alloc_hook mm/slub.c:4565 [inline]
slab_alloc_node mm/slub.c:4925 [inline]
__kmalloc_cache_noprof+0x61/0x660 mm/slub.c:5511
_kmalloc_noprof include/linux/slab.h:969 [inline]
_kzalloc_noprof include/linux/slab.h:1290 [inline]
ocfs2_reserve_new_metadata_blocks+0x10c/0x9a0 fs/ocfs2/suballoc.c:1084
ocfs2_mknod+0x10e1/0x2240 fs/ocfs2/namei.c:351
ocfs2_mkdir+0x181/0x460 fs/ocfs2/namei.c:660
vfs_mkdir+0x406/0x620 fs/namei.c:5276
filename_mkdirat+0x285/0x510 fs/namei.c:5309
__do_sys_mkdirat fs/namei.c:5330 [inline]
__se_sys_mkdirat+0x35/0x150 fs/namei.c:5327
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
-> #0 (&ocfs2_sysfile_lock_key[INODE_ALLOC_SYSTEM_INODE]){+.+.}-{4:4}:
check_prev_add kernel/locking/lockdep.c:3165 [inline]
check_prevs_add kernel/locking/lockdep.c:3284 [inline]
validate_chain kernel/locking/lockdep.c:3908 [inline]
__lock_acquire+0x1520/0x2cf0 kernel/locking/lockdep.c:5237
lock_acquire+0x106/0x350 kernel/locking/lockdep.c:5868
down_write+0x96/0x200 kernel/locking/rwsem.c:1631
inode_lock include/linux/fs.h:1024 [inline]
ocfs2_remove_inode fs/ocfs2/inode.c:767 [inline]
ocfs2_wipe_inode fs/ocfs2/inode.c:930 [inline]
ocfs2_delete_inode fs/ocfs2/inode.c:1191 [inline]
ocfs2_evict_inode+0x1489/0x4390 fs/ocfs2/inode.c:1333
evict+0x624/0xb50 fs/inode.c:825
ocfs2_dentry_iput+0x24d/0x390 fs/ocfs2/dcache.c:407
dentry_kill+0x1b9/0x880 fs/dcache.c:826
shrink_kill fs/dcache.c:1275 [inline]
shrink_dentry_list+0x209/0x310 fs/dcache.c:1292
prune_dcache_sb+0x119/0x180 fs/dcache.c:1374
super_cache_scan+0x35c/0x4a0 fs/super.c:223
do_shrink_slab+0x6d0/0x10e0 mm/shrinker.c:443
shrink_slab_memcg mm/shrinker.c:560 [inline]
shrink_slab+0x838/0x1220 mm/shrinker.c:638
shrink_one+0x2a2/0x730 mm/vmscan.c:5026
shrink_many mm/vmscan.c:5087 [inline]
lru_gen_shrink_node mm/vmscan.c:5165 [inline]
shrink_node+0x3303/0x3b60 mm/vmscan.c:6154
kswapd_shrink_node mm/vmscan.c:7008 [inline]
balance_pgdat mm/vmscan.c:7186 [inline]
kswapd+0x17b6/0x31c0 mm/vmscan.c:7462
kthread+0x388/0x470 kernel/kthread.c:436
ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
other info that might help us debug this:
Chain exists of:
&ocfs2_sysfile_lock_key[INODE_ALLOC_SYSTEM_INODE] --> &osb->nfs_sync_rwlock --> &ocfs2_sysfile_lock_key[ORPHAN_DIR_SYSTEM_INODE]
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(&ocfs2_sysfile_lock_key[ORPHAN_DIR_SYSTEM_INODE]);
lock(&osb->nfs_sync_rwlock);
lock(&ocfs2_sysfile_lock_key[ORPHAN_DIR_SYSTEM_INODE]);
lock(&ocfs2_sysfile_lock_key[INODE_ALLOC_SYSTEM_INODE]);
*** DEADLOCK ***
4 locks held by kswapd0/70:
#0: ffffffff8ec86cc0 (fs_reclaim){+.+.}-{0:0}, at: balance_pgdat mm/vmscan.c:7084 [inline]
#0: ffffffff8ec86cc0 (fs_reclaim){+.+.}-{0:0}, at: kswapd+0x9b6/0x31c0 mm/vmscan.c:7462
#1: ffff88803236c0d8 (&type->s_umount_key#53){.+.+}-{4:4}, at: super_trylock_shared fs/super.c:566 [inline]
#1: ffff88803236c0d8 (&type->s_umount_key#53){.+.+}-{4:4}, at: super_cache_scan+0x91/0x4a0 fs/super.c:198
#2: ffff888012bb4bc0 (&osb->nfs_sync_rwlock){.+.+}-{4:4}, at: ocfs2_nfs_sync_lock+0x106/0x270 fs/ocfs2/dlmglue.c:2875
#3: ffff8880444633a0 (&ocfs2_sysfile_lock_key[ORPHAN_DIR_SYSTEM_INODE]){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:1024 [inline]
#3: ffff8880444633a0 (&ocfs2_sysfile_lock_key[ORPHAN_DIR_SYSTEM_INODE]){+.+.}-{4:4}, at: ocfs2_wipe_inode fs/ocfs2/inode.c:888 [inline]
#3: ffff8880444633a0 (&ocfs2_sysfile_lock_key[ORPHAN_DIR_SYSTEM_INODE]){+.+.}-{4:4}, at: ocfs2_delete_inode fs/ocfs2/inode.c:1191 [inline]
#3: ffff8880444633a0 (&ocfs2_sysfile_lock_key[ORPHAN_DIR_SYSTEM_INODE]){+.+.}-{4:4}, at: ocfs2_evict_inode+0xe39/0x4390 fs/ocfs2/inode.c:1333
stack backtrace:
CPU: 0 UID: 0 PID: 70 Comm: kswapd0 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
Call Trace:
<TASK>
dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
print_circular_bug+0x2e1/0x300 kernel/locking/lockdep.c:2043
check_noncircular+0x12e/0x150 kernel/locking/lockdep.c:2175
check_prev_add kernel/locking/lockdep.c:3165 [inline]
check_prevs_add kernel/locking/lockdep.c:3284 [inline]
validate_chain kernel/locking/lockdep.c:3908 [inline]
__lock_acquire+0x1520/0x2cf0 kernel/locking/lockdep.c:5237
lock_acquire+0x106/0x350 kernel/locking/lockdep.c:5868
down_write+0x96/0x200 kernel/locking/rwsem.c:1631
inode_lock include/linux/fs.h:1024 [inline]
ocfs2_remove_inode fs/ocfs2/inode.c:767 [inline]
ocfs2_wipe_inode fs/ocfs2/inode.c:930 [inline]
ocfs2_delete_inode fs/ocfs2/inode.c:1191 [inline]
ocfs2_evict_inode+0x1489/0x4390 fs/ocfs2/inode.c:1333
evict+0x624/0xb50 fs/inode.c:825
ocfs2_dentry_iput+0x24d/0x390 fs/ocfs2/dcache.c:407
dentry_kill+0x1b9/0x880 fs/dcache.c:826
shrink_kill fs/dcache.c:1275 [inline]
shrink_dentry_list+0x209/0x310 fs/dcache.c:1292
prune_dcache_sb+0x119/0x180 fs/dcache.c:1374
super_cache_scan+0x35c/0x4a0 fs/super.c:223
do_shrink_slab+0x6d0/0x10e0 mm/shrinker.c:443
shrink_slab_memcg mm/shrinker.c:560 [inline]
shrink_slab+0x838/0x1220 mm/shrinker.c:638
shrink_one+0x2a2/0x730 mm/vmscan.c:5026
shrink_many mm/vmscan.c:5087 [inline]
lru_gen_shrink_node mm/vmscan.c:5165 [inline]
shrink_node+0x3303/0x3b60 mm/vmscan.c:6154
kswapd_shrink_node mm/vmscan.c:7008 [inline]
balance_pgdat mm/vmscan.c:7186 [inline]
kswapd+0x17b6/0x31c0 mm/vmscan.c:7462
kthread+0x388/0x470 kernel/kthread.c:436
ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
</TASK>
---
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2026-07-20 5:05 [syzbot] [ocfs2?] possible deadlock in ocfs2_evict_inode (2) syzbot
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