| Date | Name | Commit | Repro | Result |
|---|---|---|---|---|
| 2024/03/04 | upstream (ToT) | 90d35da658da | C | [report] BUG: MAX_LOCKDEP_KEYS too low! |
syzbot |
sign-in | mailing list | source | docs |
| 🐞 Open [558] 🐞 Fixed [32] 🐞 Invalid [299] ⬇ Missing Backports [45] 📈 Kernel Health 📈 Bug Lifetimes 📈 Fuzzing 📈 Crashes | 💬 Send us feedback |
| Date | Name | Commit | Repro | Result |
|---|---|---|---|---|
| 2024/03/04 | upstream (ToT) | 90d35da658da | C | [report] BUG: MAX_LOCKDEP_KEYS too low! |
| Kernel | Title | Repro | Cause bisect | Fix bisect | Count | Last | Reported | Patched | Status |
|---|---|---|---|---|---|---|---|---|---|
| upstream | possible deadlock in lookup_slow (3) kernfs | 279 | 1d21h | 286d | 0/26 | upstream: reported on 2023/07/19 13:17 | |||
| linux-5.15 | possible deadlock in lookup_slow | 11 | 241d | 413d | 0/3 | auto-obsoleted due to no activity on 2023/12/11 13:10 | |||
| linux-4.19 | possible deadlock in lookup_slow | 22 | 1416d | 1842d | 0/1 | auto-closed as invalid on 2020/10/12 22:59 | |||
| upstream | possible deadlock in lookup_slow fs | 139 | 1802d | 2043d | 0/26 | auto-closed as invalid on 2019/10/25 08:42 | |||
| linux-4.14 | possible deadlock in lookup_slow | C | 2027 | 421d | 1712d | 0/1 | upstream: reported C repro on 2019/08/24 01:53 | ||
| upstream | possible deadlock in lookup_slow (2) fs | 7 | 1570d | 1615d | 0/26 | auto-closed as invalid on 2020/05/11 09:17 |
BTRFS info (device loop0): using free space tree
BTRFS info (device loop0): has skinny extents
BTRFS info (device loop0): enabling ssd optimizations
======================================================
WARNING: possible circular locking dependency detected
5.15.150-syzkaller #0 Not tainted
------------------------------------------------------
syz-executor391/3961 is trying to acquire lock:
ffff0000df030fe0 (&type->i_mutex_dir_key#6){++++}-{3:3}, at: inode_lock_shared include/linux/fs.h:799 [inline]
ffff0000df030fe0 (&type->i_mutex_dir_key#6){++++}-{3:3}, at: lookup_slow+0x50/0x84 fs/namei.c:1679
but task is already holding lock:
ffff0000d9ea8ce0 (&fs_devs->device_list_mutex){+.+.}-{3:3}, at: btrfs_free_stale_devices+0x158/0x9ec fs/btrfs/volumes.c:603
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #3 (&fs_devs->device_list_mutex){+.+.}-{3:3}:
__mutex_lock_common+0x194/0x2154 kernel/locking/mutex.c:596
__mutex_lock kernel/locking/mutex.c:729 [inline]
mutex_lock_nested+0xa4/0xf8 kernel/locking/mutex.c:743
write_all_supers+0x134c/0x3a6c fs/btrfs/disk-io.c:4159
btrfs_sync_log+0x19c8/0x2294 fs/btrfs/tree-log.c:3327
btrfs_sync_file+0x924/0xe60 fs/btrfs/file.c:2349
vfs_fsync_range fs/sync.c:188 [inline]
vfs_fsync fs/sync.c:202 [inline]
do_fsync fs/sync.c:212 [inline]
__do_sys_fdatasync fs/sync.c:225 [inline]
__se_sys_fdatasync fs/sync.c:223 [inline]
__arm64_sys_fdatasync+0xac/0x104 fs/sync.c:223
__invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52
el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181
el0_svc+0x7c/0x1f0 arch/arm64/kernel/entry-common.c:608
el0t_64_sync_handler+0x84/0xe4 arch/arm64/kernel/entry-common.c:626
el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584
-> #2 (&fs_info->tree_log_mutex){+.+.}-{3:3}:
__mutex_lock_common+0x194/0x2154 kernel/locking/mutex.c:596
__mutex_lock kernel/locking/mutex.c:729 [inline]
mutex_lock_nested+0xa4/0xf8 kernel/locking/mutex.c:743
btrfs_sync_log+0x1904/0x2294 fs/btrfs/tree-log.c:3308
btrfs_sync_file+0x924/0xe60 fs/btrfs/file.c:2349
vfs_fsync_range fs/sync.c:188 [inline]
vfs_fsync fs/sync.c:202 [inline]
do_fsync fs/sync.c:212 [inline]
__do_sys_fdatasync fs/sync.c:225 [inline]
__se_sys_fdatasync fs/sync.c:223 [inline]
__arm64_sys_fdatasync+0xac/0x104 fs/sync.c:223
__invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52
el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181
el0_svc+0x7c/0x1f0 arch/arm64/kernel/entry-common.c:608
el0t_64_sync_handler+0x84/0xe4 arch/arm64/kernel/entry-common.c:626
el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584
-> #1 (sb_internal#2){.+.+}-{0:0}:
__lock_release kernel/locking/lockdep.c:5339 [inline]
lock_release+0x340/0xa1c kernel/locking/lockdep.c:5643
up_write+0x98/0x438 kernel/locking/rwsem.c:1593
btrfs_inode_unlock+0x40/0x80 fs/btrfs/inode.c:140
btrfs_sync_file+0x870/0xe60 fs/btrfs/file.c:2340
vfs_fsync_range fs/sync.c:188 [inline]
vfs_fsync fs/sync.c:202 [inline]
do_fsync fs/sync.c:212 [inline]
__do_sys_fdatasync fs/sync.c:225 [inline]
__se_sys_fdatasync fs/sync.c:223 [inline]
__arm64_sys_fdatasync+0xac/0x104 fs/sync.c:223
__invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52
el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181
el0_svc+0x7c/0x1f0 arch/arm64/kernel/entry-common.c:608
el0t_64_sync_handler+0x84/0xe4 arch/arm64/kernel/entry-common.c:626
el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584
-> #0 (&type->i_mutex_dir_key#6){++++}-{3:3}:
check_prev_add kernel/locking/lockdep.c:3053 [inline]
check_prevs_add kernel/locking/lockdep.c:3172 [inline]
validate_chain kernel/locking/lockdep.c:3788 [inline]
__lock_acquire+0x32d4/0x7638 kernel/locking/lockdep.c:5012
lock_acquire+0x240/0x77c kernel/locking/lockdep.c:5623
down_read+0xc0/0x398 kernel/locking/rwsem.c:1488
inode_lock_shared include/linux/fs.h:799 [inline]
lookup_slow+0x50/0x84 fs/namei.c:1679
walk_component+0x394/0x4cc fs/namei.c:1976
link_path_walk+0x5a0/0xc38
path_lookupat+0x90/0x3d0 fs/namei.c:2454
filename_lookup+0x1c4/0x4c8 fs/namei.c:2484
kern_path+0x4c/0x194 fs/namei.c:2582
lookup_bdev+0xc0/0x25c block/bdev.c:979
device_matched fs/btrfs/volumes.c:568 [inline]
btrfs_free_stale_devices+0x658/0x9ec fs/btrfs/volumes.c:608
btrfs_forget_devices+0x5c/0x98 fs/btrfs/volumes.c:1388
btrfs_control_ioctl+0x12c/0x248 fs/btrfs/super.c:2451
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:874 [inline]
__se_sys_ioctl fs/ioctl.c:860 [inline]
__arm64_sys_ioctl+0x14c/0x1c8 fs/ioctl.c:860
__invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52
el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181
el0_svc+0x7c/0x1f0 arch/arm64/kernel/entry-common.c:608
el0t_64_sync_handler+0x84/0xe4 arch/arm64/kernel/entry-common.c:626
el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584
other info that might help us debug this:
Chain exists of:
&type->i_mutex_dir_key#6 --> &fs_info->tree_log_mutex --> &fs_devs->device_list_mutex
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(&fs_devs->device_list_mutex);
lock(&fs_info->tree_log_mutex);
lock(&fs_devs->device_list_mutex);
lock(&type->i_mutex_dir_key#6);
*** DEADLOCK ***
2 locks held by syz-executor391/3961:
#0: ffff800014fa5e28 (uuid_mutex){+.+.}-{3:3}, at: btrfs_forget_devices+0x28/0x98 fs/btrfs/volumes.c:1387
#1: ffff0000d9ea8ce0 (&fs_devs->device_list_mutex){+.+.}-{3:3}, at: btrfs_free_stale_devices+0x158/0x9ec fs/btrfs/volumes.c:603
stack backtrace:
CPU: 1 PID: 3961 Comm: syz-executor391 Not tainted 5.15.150-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024
Call trace:
dump_backtrace+0x0/0x530 arch/arm64/kernel/stacktrace.c:152
show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:216
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x108/0x170 lib/dump_stack.c:106
dump_stack+0x1c/0x58 lib/dump_stack.c:113
print_circular_bug+0x150/0x1b8 kernel/locking/lockdep.c:2011
check_noncircular+0x2cc/0x378 kernel/locking/lockdep.c:2133
check_prev_add kernel/locking/lockdep.c:3053 [inline]
check_prevs_add kernel/locking/lockdep.c:3172 [inline]
validate_chain kernel/locking/lockdep.c:3788 [inline]
__lock_acquire+0x32d4/0x7638 kernel/locking/lockdep.c:5012
lock_acquire+0x240/0x77c kernel/locking/lockdep.c:5623
down_read+0xc0/0x398 kernel/locking/rwsem.c:1488
inode_lock_shared include/linux/fs.h:799 [inline]
lookup_slow+0x50/0x84 fs/namei.c:1679
walk_component+0x394/0x4cc fs/namei.c:1976
link_path_walk+0x5a0/0xc38
path_lookupat+0x90/0x3d0 fs/namei.c:2454
filename_lookup+0x1c4/0x4c8 fs/namei.c:2484
kern_path+0x4c/0x194 fs/namei.c:2582
lookup_bdev+0xc0/0x25c block/bdev.c:979
device_matched fs/btrfs/volumes.c:568 [inline]
btrfs_free_stale_devices+0x658/0x9ec fs/btrfs/volumes.c:608
btrfs_forget_devices+0x5c/0x98 fs/btrfs/volumes.c:1388
btrfs_control_ioctl+0x12c/0x248 fs/btrfs/super.c:2451
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:874 [inline]
__se_sys_ioctl fs/ioctl.c:860 [inline]
__arm64_sys_ioctl+0x14c/0x1c8 fs/ioctl.c:860
__invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52
el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181
el0_svc+0x7c/0x1f0 arch/arm64/kernel/entry-common.c:608
el0t_64_sync_handler+0x84/0xe4 arch/arm64/kernel/entry-common.c:626
el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584
| Time | Kernel | Commit | Syzkaller | Config | Log | Report | Syz repro | C repro | VM info | Assets (help?) | Manager | Title |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2024/03/04 02:18 | linux-5.15.y | 80efc6265290 | 25905f5d | .config | console log | report | syz | C | [disk image] [vmlinux] [kernel image] [mounted in repro] | ci2-linux-5-15-kasan-arm64 | possible deadlock in lookup_slow | |
| 2024/04/13 08:33 | linux-5.15.y | cdfd0a7f0139 | c8349e48 | .config | console log | report | info | [disk image] [vmlinux] [kernel image] | ci2-linux-5-15-kasan | possible deadlock in lookup_slow | ||
| 2024/04/30 07:32 | linux-5.15.y | b925f60c6ee7 | f10afd69 | .config | console log | report | info | [disk image] [vmlinux] [kernel image] | ci2-linux-5-15-kasan-arm64 | possible deadlock in lookup_slow | ||
| 2024/04/21 02:18 | linux-5.15.y | c52b9710c83d | af24b050 | .config | console log | report | info | [disk image] [vmlinux] [kernel image] | ci2-linux-5-15-kasan-arm64 | possible deadlock in lookup_slow | ||
| 2024/04/20 14:55 | linux-5.15.y | c52b9710c83d | af24b050 | .config | console log | report | info | [disk image] [vmlinux] [kernel image] | ci2-linux-5-15-kasan-arm64 | possible deadlock in lookup_slow | ||
| 2024/04/20 14:46 | linux-5.15.y | c52b9710c83d | af24b050 | .config | console log | report | info | [disk image] [vmlinux] [kernel image] | ci2-linux-5-15-kasan-arm64 | possible deadlock in lookup_slow | ||
| 2024/04/14 06:52 | linux-5.15.y | fa3df276cd36 | c8349e48 | .config | console log | report | info | [disk image] [vmlinux] [kernel image] | ci2-linux-5-15-kasan-arm64 | possible deadlock in lookup_slow | ||
| 2024/04/13 04:16 | linux-5.15.y | cdfd0a7f0139 | c8349e48 | .config | console log | report | info | [disk image] [vmlinux] [kernel image] | ci2-linux-5-15-kasan-arm64 | possible deadlock in lookup_slow | ||
| 2024/04/10 07:16 | linux-5.15.y | 9465fef4ae35 | 171ec371 | .config | console log | report | info | [disk image] [vmlinux] [kernel image] | ci2-linux-5-15-kasan-arm64 | possible deadlock in lookup_slow | ||
| 2024/04/08 21:28 | linux-5.15.y | 9465fef4ae35 | 53df08b6 | .config | console log | report | info | [disk image] [vmlinux] [kernel image] | ci2-linux-5-15-kasan-arm64 | possible deadlock in lookup_slow | ||
| 2024/03/28 22:36 | linux-5.15.y | 9465fef4ae35 | e91187ee | .config | console log | report | info | [disk image] [vmlinux] [kernel image] | ci2-linux-5-15-kasan-arm64 | possible deadlock in lookup_slow | ||
| 2024/03/28 11:13 | linux-5.15.y | 9465fef4ae35 | 120789fd | .config | console log | report | info | [disk image] [vmlinux] [kernel image] | ci2-linux-5-15-kasan-arm64 | possible deadlock in lookup_slow | ||
| 2024/03/04 01:51 | linux-5.15.y | 80efc6265290 | 25905f5d | .config | console log | report | info | [disk image] [vmlinux] [kernel image] | ci2-linux-5-15-kasan-arm64 | possible deadlock in lookup_slow | ||
| 2023/12/13 22:34 | linux-5.15.y | d0fc081c6241 | 3222d10c | .config | console log | report | info | [disk image] [vmlinux] [kernel image] | ci2-linux-5-15-kasan-arm64 | possible deadlock in lookup_slow |