| Title | Replies (including bot) | Last reply |
|---|---|---|
| [syzbot] Monthly nilfs report (Jan 2024) | 0 (1) | 2024/01/02 13:35 |
| [syzbot] [nilfs?] possible deadlock in nilfs_dirty_inode (2) | 0 (1) | 2023/12/22 00:59 |
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| Title | Replies (including bot) | Last reply |
|---|---|---|
| [syzbot] Monthly nilfs report (Jan 2024) | 0 (1) | 2024/01/02 13:35 |
| [syzbot] [nilfs?] possible deadlock in nilfs_dirty_inode (2) | 0 (1) | 2023/12/22 00:59 |
| Kernel | Title | Repro | Cause bisect | Fix bisect | Count | Last | Reported | Patched | Status |
|---|---|---|---|---|---|---|---|---|---|
| upstream | possible deadlock in nilfs_dirty_inode (3) nilfs | 16 | 184d | 235d | 0/28 | closed as dup on 2024/07/04 16:38 | |||
| upstream | possible deadlock in nilfs_dirty_inode nilfs | 1 | 547d | 543d | 0/28 | auto-obsoleted due to no activity on 2023/09/30 14:44 | |||
| upstream | possible deadlock in nilfs_dirty_inode (4) nilfs | C | 2 | 53d | 63d | 28/28 | fixed on 2024/11/14 10:09 |
======================================================
WARNING: possible circular locking dependency detected
6.7.0-rc6-syzkaller-00022-g55cb5f43689d #0 Not tainted
------------------------------------------------------
kswapd0/108 is trying to acquire lock:
ffff888079954608 (sb_internal#4){.+.+}-{0:0}, at: nilfs_dirty_inode+0x1a0/0x270 fs/nilfs2/inode.c:1158
but task is already holding lock:
ffffffff8d11c740 (fs_reclaim){+.+.}-{0:0}, at: balance_pgdat+0x160/0x1a90 mm/vmscan.c:6746
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #2 (fs_reclaim){+.+.}-{0:0}:
__fs_reclaim_acquire mm/page_alloc.c:3693 [inline]
fs_reclaim_acquire+0x100/0x150 mm/page_alloc.c:3707
might_alloc include/linux/sched/mm.h:303 [inline]
prepare_alloc_pages.constprop.0+0x155/0x550 mm/page_alloc.c:4339
__alloc_pages+0x193/0x2420 mm/page_alloc.c:4557
alloc_pages_mpol+0x258/0x5f0 mm/mempolicy.c:2133
folio_alloc+0x1e/0xe0 mm/mempolicy.c:2211
filemap_alloc_folio+0x3bb/0x490 mm/filemap.c:974
__filemap_get_folio+0x54c/0xaa0 mm/filemap.c:1918
pagecache_get_page+0x2c/0x250 mm/folio-compat.c:99
block_write_begin+0x38/0x490 fs/buffer.c:2223
nilfs_write_begin+0x9f/0x1a0 fs/nilfs2/inode.c:261
page_symlink+0x391/0x490 fs/namei.c:5187
nilfs_symlink+0x24f/0x3e0 fs/nilfs2/namei.c:153
vfs_symlink fs/namei.c:4464 [inline]
vfs_symlink+0x3e4/0x620 fs/namei.c:4448
do_symlinkat+0x25f/0x310 fs/namei.c:4490
__do_sys_symlinkat fs/namei.c:4506 [inline]
__se_sys_symlinkat fs/namei.c:4503 [inline]
__ia32_sys_symlinkat+0x97/0xc0 fs/namei.c:4503
do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline]
__do_fast_syscall_32+0x62/0xe0 arch/x86/entry/common.c:321
do_fast_syscall_32+0x33/0x70 arch/x86/entry/common.c:346
entry_SYSENTER_compat_after_hwframe+0x70/0x7a
-> #1 (&nilfs->ns_segctor_sem){++++}-{3:3}:
down_read+0x9a/0x330 kernel/locking/rwsem.c:1526
nilfs_transaction_begin+0x329/0xa40 fs/nilfs2/segment.c:223
nilfs_symlink+0x130/0x3e0 fs/nilfs2/namei.c:140
vfs_symlink fs/namei.c:4464 [inline]
vfs_symlink+0x3e4/0x620 fs/namei.c:4448
do_symlinkat+0x25f/0x310 fs/namei.c:4490
__do_sys_symlinkat fs/namei.c:4506 [inline]
__se_sys_symlinkat fs/namei.c:4503 [inline]
__ia32_sys_symlinkat+0x97/0xc0 fs/namei.c:4503
do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline]
__do_fast_syscall_32+0x62/0xe0 arch/x86/entry/common.c:321
do_fast_syscall_32+0x33/0x70 arch/x86/entry/common.c:346
entry_SYSENTER_compat_after_hwframe+0x70/0x7a
-> #0 (sb_internal#4){.+.+}-{0:0}:
check_prev_add kernel/locking/lockdep.c:3134 [inline]
check_prevs_add kernel/locking/lockdep.c:3253 [inline]
validate_chain kernel/locking/lockdep.c:3869 [inline]
__lock_acquire+0x2433/0x3b20 kernel/locking/lockdep.c:5137
lock_acquire kernel/locking/lockdep.c:5754 [inline]
lock_acquire+0x1ae/0x520 kernel/locking/lockdep.c:5719
percpu_down_read include/linux/percpu-rwsem.h:51 [inline]
__sb_start_write include/linux/fs.h:1635 [inline]
sb_start_intwrite include/linux/fs.h:1757 [inline]
nilfs_transaction_begin+0x21e/0xa40 fs/nilfs2/segment.c:220
nilfs_dirty_inode+0x1a0/0x270 fs/nilfs2/inode.c:1158
__mark_inode_dirty+0x1e0/0xd60 fs/fs-writeback.c:2452
mark_inode_dirty_sync include/linux/fs.h:2311 [inline]
iput.part.0+0x5b/0x7b0 fs/inode.c:1800
iput+0x5c/0x80 fs/inode.c:1793
dentry_unlink_inode+0x292/0x430 fs/dcache.c:401
__dentry_kill+0x3b8/0x640 fs/dcache.c:607
shrink_dentry_list+0x11e/0x4a0 fs/dcache.c:1201
prune_dcache_sb+0xeb/0x150 fs/dcache.c:1282
super_cache_scan+0x327/0x540 fs/super.c:228
do_shrink_slab+0x428/0x1120 mm/shrinker.c:435
shrink_slab_memcg mm/shrinker.c:548 [inline]
shrink_slab+0xa83/0x1310 mm/shrinker.c:626
shrink_one+0x47d/0x7a0 mm/vmscan.c:4745
shrink_many mm/vmscan.c:4808 [inline]
lru_gen_shrink_node mm/vmscan.c:4923 [inline]
shrink_node+0x211c/0x3710 mm/vmscan.c:5863
kswapd_shrink_node mm/vmscan.c:6668 [inline]
balance_pgdat+0x9d2/0x1a90 mm/vmscan.c:6858
kswapd+0x5be/0xbf0 mm/vmscan.c:7118
kthread+0x2c6/0x3a0 kernel/kthread.c:388
ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242
other info that might help us debug this:
Chain exists of:
sb_internal#4 --> &nilfs->ns_segctor_sem --> fs_reclaim
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(fs_reclaim);
lock(&nilfs->ns_segctor_sem);
lock(fs_reclaim);
rlock(sb_internal#4);
*** DEADLOCK ***
2 locks held by kswapd0/108:
#0: ffffffff8d11c740 (fs_reclaim){+.+.}-{0:0}, at: balance_pgdat+0x160/0x1a90 mm/vmscan.c:6746
#1: ffff8880799540e0 (&type->s_umount_key#68){++++}-{3:3}, at: super_trylock_shared fs/super.c:610 [inline]
#1: ffff8880799540e0 (&type->s_umount_key#68){++++}-{3:3}, at: super_cache_scan+0x96/0x540 fs/super.c:203
stack backtrace:
CPU: 2 PID: 108 Comm: kswapd0 Not tainted 6.7.0-rc6-syzkaller-00022-g55cb5f43689d #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xd9/0x1b0 lib/dump_stack.c:106
check_noncircular+0x317/0x400 kernel/locking/lockdep.c:2187
check_prev_add kernel/locking/lockdep.c:3134 [inline]
check_prevs_add kernel/locking/lockdep.c:3253 [inline]
validate_chain kernel/locking/lockdep.c:3869 [inline]
__lock_acquire+0x2433/0x3b20 kernel/locking/lockdep.c:5137
lock_acquire kernel/locking/lockdep.c:5754 [inline]
lock_acquire+0x1ae/0x520 kernel/locking/lockdep.c:5719
percpu_down_read include/linux/percpu-rwsem.h:51 [inline]
__sb_start_write include/linux/fs.h:1635 [inline]
sb_start_intwrite include/linux/fs.h:1757 [inline]
nilfs_transaction_begin+0x21e/0xa40 fs/nilfs2/segment.c:220
nilfs_dirty_inode+0x1a0/0x270 fs/nilfs2/inode.c:1158
__mark_inode_dirty+0x1e0/0xd60 fs/fs-writeback.c:2452
mark_inode_dirty_sync include/linux/fs.h:2311 [inline]
iput.part.0+0x5b/0x7b0 fs/inode.c:1800
iput+0x5c/0x80 fs/inode.c:1793
dentry_unlink_inode+0x292/0x430 fs/dcache.c:401
__dentry_kill+0x3b8/0x640 fs/dcache.c:607
shrink_dentry_list+0x11e/0x4a0 fs/dcache.c:1201
prune_dcache_sb+0xeb/0x150 fs/dcache.c:1282
super_cache_scan+0x327/0x540 fs/super.c:228
do_shrink_slab+0x428/0x1120 mm/shrinker.c:435
shrink_slab_memcg mm/shrinker.c:548 [inline]
shrink_slab+0xa83/0x1310 mm/shrinker.c:626
shrink_one+0x47d/0x7a0 mm/vmscan.c:4745
shrink_many mm/vmscan.c:4808 [inline]
lru_gen_shrink_node mm/vmscan.c:4923 [inline]
shrink_node+0x211c/0x3710 mm/vmscan.c:5863
kswapd_shrink_node mm/vmscan.c:6668 [inline]
balance_pgdat+0x9d2/0x1a90 mm/vmscan.c:6858
kswapd+0x5be/0xbf0 mm/vmscan.c:7118
kthread+0x2c6/0x3a0 kernel/kthread.c:388
ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242
</TASK>
| Time | Kernel | Commit | Syzkaller | Config | Log | Report | Syz repro | C repro | VM info | Assets (help?) | Manager | Title |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2023/12/20 20:18 | upstream | 55cb5f43689d | de21eb89 | .config | console log | report | info | [disk image (non-bootable)] [vmlinux] [kernel image] | ci-qemu-upstream-386 | possible deadlock in nilfs_dirty_inode |