======================================================
WARNING: possible circular locking dependency detected
5.15.178-syzkaller #0 Not tainted
------------------------------------------------------
syz.0.2608/14983 is trying to acquire lock:
ffff0000da01ba70 (&type->i_mutex_dir_key#5){++++}-{3:3}, at: inode_lock_shared include/linux/fs.h:799 [inline]
ffff0000da01ba70 (&type->i_mutex_dir_key#5){++++}-{3:3}, at: lookup_slow+0x50/0x84 fs/namei.c:1679
but task is already holding lock:
ffff0000e843f4e0 (&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:
-> #4 (&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
btrfs_run_dev_stats+0xe4/0xe24 fs/btrfs/volumes.c:7985
commit_cowonly_roots+0x17c/0x808 fs/btrfs/transaction.c:1290
btrfs_commit_transaction+0xef4/0x30f0 fs/btrfs/transaction.c:2392
btrfs_commit_super+0xb4/0xd0 fs/btrfs/disk-io.c:4338
close_ctree+0x3b0/0x898 fs/btrfs/disk-io.c:4470
btrfs_put_super+0x40/0x50 fs/btrfs/super.c:340
generic_shutdown_super+0x130/0x2f0 fs/super.c:475
kill_anon_super+0x4c/0x74 fs/super.c:1089
btrfs_kill_super+0x40/0x58 fs/btrfs/super.c:2391
deactivate_locked_super+0xb8/0x13c fs/super.c:335
deactivate_super+0x108/0x128 fs/super.c:366
cleanup_mnt+0x3c0/0x474 fs/namespace.c:1143
__cleanup_mnt+0x20/0x30 fs/namespace.c:1150
task_work_run+0x130/0x1e4 kernel/task_work.c:188
tracehook_notify_resume include/linux/tracehook.h:189 [inline]
do_notify_resume+0x262c/0x32b8 arch/arm64/kernel/signal.c:946
prepare_exit_to_user_mode arch/arm64/kernel/entry-common.c:133 [inline]
exit_to_user_mode arch/arm64/kernel/entry-common.c:138 [inline]
el0_svc+0xfc/0x1f0 arch/arm64/kernel/entry-common.c:609
el0t_64_sync_handler+0x84/0xe4 arch/arm64/kernel/entry-common.c:626
el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584
-> #3 (&fs_info->tree_log_mutex){+.+.}-{3:3}:
__lock_release kernel/locking/lockdep.c:5339 [inline]
lock_release+0x340/0xa1c kernel/locking/lockdep.c:5643
__mutex_unlock_slowpath+0xe0/0x6d4 kernel/locking/mutex.c:851
mutex_unlock+0x8c/0xe0 kernel/locking/mutex.c:536
btrfs_commit_transaction+0x1650/0x30f0 fs/btrfs/transaction.c:2439
btrfs_commit_super+0xb4/0xd0 fs/btrfs/disk-io.c:4338
close_ctree+0x3b0/0x898 fs/btrfs/disk-io.c:4470
btrfs_put_super+0x40/0x50 fs/btrfs/super.c:340
generic_shutdown_super+0x130/0x2f0 fs/super.c:475
kill_anon_super+0x4c/0x74 fs/super.c:1089
btrfs_kill_super+0x40/0x58 fs/btrfs/super.c:2391
deactivate_locked_super+0xb8/0x13c fs/super.c:335
deactivate_super+0x108/0x128 fs/super.c:366
cleanup_mnt+0x3c0/0x474 fs/namespace.c:1143
__cleanup_mnt+0x20/0x30 fs/namespace.c:1150
task_work_run+0x130/0x1e4 kernel/task_work.c:188
tracehook_notify_resume include/linux/tracehook.h:189 [inline]
do_notify_resume+0x262c/0x32b8 arch/arm64/kernel/signal.c:946
prepare_exit_to_user_mode arch/arm64/kernel/entry-common.c:133 [inline]
exit_to_user_mode arch/arm64/kernel/entry-common.c:138 [inline]
el0_svc+0xfc/0x1f0 arch/arm64/kernel/entry-common.c:609
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 (sb_internal#2){.+.+}-{0:0}:
percpu_down_read include/linux/percpu-rwsem.h:51 [inline]
__sb_start_write include/linux/fs.h:1813 [inline]
sb_start_intwrite include/linux/fs.h:1930 [inline]
start_transaction+0x644/0x1480 fs/btrfs/transaction.c:678
btrfs_join_transaction+0x30/0x40 fs/btrfs/transaction.c:791
btrfs_dirty_inode+0xb4/0x1c0 fs/btrfs/inode.c:6436
btrfs_update_time+0x248/0x270 fs/btrfs/inode.c:6478
inode_update_time fs/inode.c:1868 [inline]
touch_atime+0x434/0xa4c fs/inode.c:1941
file_accessed include/linux/fs.h:2523 [inline]
btrfs_file_mmap+0xb0/0x11c fs/btrfs/file.c:2451
call_mmap include/linux/fs.h:2179 [inline]
mmap_file+0x6c/0xc8 mm/util.c:1092
__mmap_region mm/mmap.c:1784 [inline]
mmap_region+0xb24/0x1408 mm/mmap.c:2921
do_mmap+0x698/0xdb8 mm/mmap.c:1574
vm_mmap_pgoff+0x1a4/0x2b4 mm/util.c:551
ksys_mmap_pgoff+0x458/0x668 mm/mmap.c:1623
__do_sys_mmap arch/arm64/kernel/sys.c:28 [inline]
__se_sys_mmap arch/arm64/kernel/sys.c:21 [inline]
__arm64_sys_mmap+0xf8/0x110 arch/arm64/kernel/sys.c:21
__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 (&mm->mmap_lock){++++}-{3:3}:
__might_fault+0xc8/0x128 mm/memory.c:5355
filldir64+0x2bc/0x9e4 fs/readdir.c:335
dir_emit_dot include/linux/fs.h:3721 [inline]
dir_emit_dots include/linux/fs.h:3732 [inline]
dcache_readdir+0x134/0x678 fs/libfs.c:196
iterate_dir+0x1f4/0x4ec
__do_sys_getdents64 fs/readdir.c:369 [inline]
__se_sys_getdents64 fs/readdir.c:354 [inline]
__arm64_sys_getdents64+0x1c4/0x4c4 fs/readdir.c:354
__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#5){++++}-{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:1498
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:1431
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#5 --> &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#5);
*** DEADLOCK ***
2 locks held by syz.0.2608/14983:
#0: ffff800015222028 (uuid_mutex){+.+.}-{3:3}, at: btrfs_forget_devices+0x28/0x98 fs/btrfs/volumes.c:1430
#1: ffff0000e843f4e0 (&fs_devs->device_list_mutex){+.+.}-{3:3}, at: btrfs_free_stale_devices+0x158/0x9ec fs/btrfs/volumes.c:603
stack backtrace:
CPU: 0 PID: 14983 Comm: syz.0.2608 Not tainted 5.15.178-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
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:1498
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:1431
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