======================================================
WARNING: possible circular locking dependency detected
6.1.45-syzkaller #0 Not tainted
------------------------------------------------------
syz-executor184/4260 is trying to acquire lock:
ffff0000d79fa130 (sk_lock-AF_BLUETOOTH-BTPROTO_RFCOMM){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1733 [inline]
ffff0000d79fa130 (sk_lock-AF_BLUETOOTH-BTPROTO_RFCOMM){+.+.}-{0:0}, at: rfcomm_sk_state_change+0x60/0x2c8 net/bluetooth/rfcomm/sock.c:73
but task is already holding lock:
ffff0000d0ddf928 (&d->lock){+.+.}-{3:3}, at: __rfcomm_dlc_close+0x1f8/0x600 net/bluetooth/rfcomm/core.c:487
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #3 (&d->lock){+.+.}-{3:3}:
__mutex_lock_common+0x190/0x21a0 kernel/locking/mutex.c:603
__mutex_lock kernel/locking/mutex.c:747 [inline]
mutex_lock_nested+0x38/0x44 kernel/locking/mutex.c:799
__rfcomm_dlc_close+0x1f8/0x600 net/bluetooth/rfcomm/core.c:487
rfcomm_dlc_close+0x100/0x194 net/bluetooth/rfcomm/core.c:520
__rfcomm_sock_close+0x138/0x258 net/bluetooth/rfcomm/sock.c:220
rfcomm_sock_shutdown+0xa8/0x214 net/bluetooth/rfcomm/sock.c:912
rfcomm_sock_release+0x58/0x114 net/bluetooth/rfcomm/sock.c:933
__sock_release net/socket.c:652 [inline]
sock_close+0xb8/0x1fc net/socket.c:1370
__fput+0x30c/0x7bc fs/file_table.c:320
____fput+0x20/0x30 fs/file_table.c:348
task_work_run+0x240/0x2f0 kernel/task_work.c:179
exit_task_work include/linux/task_work.h:38 [inline]
do_exit+0x554/0x1a88 kernel/exit.c:869
do_group_exit+0x194/0x22c kernel/exit.c:1019
get_signal+0x14a0/0x158c kernel/signal.c:2862
do_signal arch/arm64/kernel/signal.c:1076 [inline]
do_notify_resume+0x3ac/0x3470 arch/arm64/kernel/signal.c:1129
prepare_exit_to_user_mode arch/arm64/kernel/entry-common.c:137 [inline]
exit_to_user_mode arch/arm64/kernel/entry-common.c:142 [inline]
el0_svc+0x9c/0x168 arch/arm64/kernel/entry-common.c:638
el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:581
-> #2 (rfcomm_mutex){+.+.}-{3:3}:
__mutex_lock_common+0x190/0x21a0 kernel/locking/mutex.c:603
__mutex_lock kernel/locking/mutex.c:747 [inline]
mutex_lock_nested+0x38/0x44 kernel/locking/mutex.c:799
rfcomm_dlc_exists+0xb0/0x32c net/bluetooth/rfcomm/core.c:542
__rfcomm_create_dev net/bluetooth/rfcomm/tty.c:414 [inline]
rfcomm_create_dev net/bluetooth/rfcomm/tty.c:485 [inline]
rfcomm_dev_ioctl+0x888/0x22a8 net/bluetooth/rfcomm/tty.c:587
rfcomm_sock_ioctl+0x98/0xf0 net/bluetooth/rfcomm/sock.c:880
sock_do_ioctl+0x134/0x2dc net/socket.c:1174
sock_ioctl+0x4ec/0x858 net/socket.c:1291
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:870 [inline]
__se_sys_ioctl fs/ioctl.c:856 [inline]
__arm64_sys_ioctl+0x14c/0x1c8 fs/ioctl.c:856
__invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
invoke_syscall+0x98/0x2c0 arch/arm64/kernel/syscall.c:52
el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
do_el0_svc+0x64/0x218 arch/arm64/kernel/syscall.c:206
el0_svc+0x58/0x168 arch/arm64/kernel/entry-common.c:637
el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:581
-> #1 (rfcomm_ioctl_mutex){+.+.}-{3:3}:
__mutex_lock_common+0x190/0x21a0 kernel/locking/mutex.c:603
__mutex_lock kernel/locking/mutex.c:747 [inline]
mutex_lock_nested+0x38/0x44 kernel/locking/mutex.c:799
rfcomm_create_dev net/bluetooth/rfcomm/tty.c:484 [inline]
rfcomm_dev_ioctl+0x258/0x22a8 net/bluetooth/rfcomm/tty.c:587
rfcomm_sock_ioctl+0x98/0xf0 net/bluetooth/rfcomm/sock.c:880
sock_do_ioctl+0x134/0x2dc net/socket.c:1174
sock_ioctl+0x4ec/0x858 net/socket.c:1291
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:870 [inline]
__se_sys_ioctl fs/ioctl.c:856 [inline]
__arm64_sys_ioctl+0x14c/0x1c8 fs/ioctl.c:856
__invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
invoke_syscall+0x98/0x2c0 arch/arm64/kernel/syscall.c:52
el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
do_el0_svc+0x64/0x218 arch/arm64/kernel/syscall.c:206
el0_svc+0x58/0x168 arch/arm64/kernel/entry-common.c:637
el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:581
-> #0 (sk_lock-AF_BLUETOOTH-BTPROTO_RFCOMM){+.+.}-{0:0}:
check_prev_add kernel/locking/lockdep.c:3098 [inline]
check_prevs_add kernel/locking/lockdep.c:3217 [inline]
validate_chain kernel/locking/lockdep.c:3832 [inline]
__lock_acquire+0x3338/0x764c kernel/locking/lockdep.c:5056
lock_acquire+0x26c/0x7cc kernel/locking/lockdep.c:5669
lock_sock_nested+0x78/0x138 net/core/sock.c:3470
lock_sock include/net/sock.h:1733 [inline]
rfcomm_sk_state_change+0x60/0x2c8 net/bluetooth/rfcomm/sock.c:73
__rfcomm_dlc_close+0x234/0x600 net/bluetooth/rfcomm/core.c:489
rfcomm_dlc_close+0x100/0x194 net/bluetooth/rfcomm/core.c:520
__rfcomm_sock_close+0x138/0x258 net/bluetooth/rfcomm/sock.c:220
rfcomm_sock_shutdown+0xa8/0x214 net/bluetooth/rfcomm/sock.c:912
rfcomm_sock_release+0x58/0x114 net/bluetooth/rfcomm/sock.c:933
__sock_release net/socket.c:652 [inline]
sock_close+0xb8/0x1fc net/socket.c:1370
__fput+0x30c/0x7bc fs/file_table.c:320
____fput+0x20/0x30 fs/file_table.c:348
task_work_run+0x240/0x2f0 kernel/task_work.c:179
exit_task_work include/linux/task_work.h:38 [inline]
do_exit+0x554/0x1a88 kernel/exit.c:869
do_group_exit+0x194/0x22c kernel/exit.c:1019
get_signal+0x14a0/0x158c kernel/signal.c:2862
do_signal arch/arm64/kernel/signal.c:1076 [inline]
do_notify_resume+0x3ac/0x3470 arch/arm64/kernel/signal.c:1129
prepare_exit_to_user_mode arch/arm64/kernel/entry-common.c:137 [inline]
exit_to_user_mode arch/arm64/kernel/entry-common.c:142 [inline]
el0_svc+0x9c/0x168 arch/arm64/kernel/entry-common.c:638
el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:581
other info that might help us debug this:
Chain exists of:
sk_lock-AF_BLUETOOTH-BTPROTO_RFCOMM --> rfcomm_mutex --> &d->lock
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(&d->lock);
lock(rfcomm_mutex);
lock(&d->lock);
lock(sk_lock-AF_BLUETOOTH-BTPROTO_RFCOMM);
*** DEADLOCK ***
3 locks held by syz-executor184/4260:
#0: ffff0000d6c9ac10 (&sb->s_type->i_mutex_key#11){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:756 [inline]
#0: ffff0000d6c9ac10 (&sb->s_type->i_mutex_key#11){+.+.}-{3:3}, at: __sock_release net/socket.c:651 [inline]
#0: ffff0000d6c9ac10 (&sb->s_type->i_mutex_key#11){+.+.}-{3:3}, at: sock_close+0x80/0x1fc net/socket.c:1370
#1: ffff800017fe2fc8 (rfcomm_mutex){+.+.}-{3:3}, at: rfcomm_dlc_close+0x44/0x194 net/bluetooth/rfcomm/core.c:507
#2: ffff0000d0ddf928 (&d->lock){+.+.}-{3:3}, at: __rfcomm_dlc_close+0x1f8/0x600 net/bluetooth/rfcomm/core.c:487
stack backtrace:
CPU: 1 PID: 4260 Comm: syz-executor184 Not tainted 6.1.45-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2023
Call trace:
dump_backtrace+0x1c8/0x1f4 arch/arm64/kernel/stacktrace.c:158
show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165
__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:2056
check_noncircular+0x2cc/0x378 kernel/locking/lockdep.c:2178
check_prev_add kernel/locking/lockdep.c:3098 [inline]
check_prevs_add kernel/locking/lockdep.c:3217 [inline]
validate_chain kernel/locking/lockdep.c:3832 [inline]
__lock_acquire+0x3338/0x764c kernel/locking/lockdep.c:5056
lock_acquire+0x26c/0x7cc kernel/locking/lockdep.c:5669
lock_sock_nested+0x78/0x138 net/core/sock.c:3470
lock_sock include/net/sock.h:1733 [inline]
rfcomm_sk_state_change+0x60/0x2c8 net/bluetooth/rfcomm/sock.c:73
__rfcomm_dlc_close+0x234/0x600 net/bluetooth/rfcomm/core.c:489
rfcomm_dlc_close+0x100/0x194 net/bluetooth/rfcomm/core.c:520
__rfcomm_sock_close+0x138/0x258 net/bluetooth/rfcomm/sock.c:220
rfcomm_sock_shutdown+0xa8/0x214 net/bluetooth/rfcomm/sock.c:912
rfcomm_sock_release+0x58/0x114 net/bluetooth/rfcomm/sock.c:933
__sock_release net/socket.c:652 [inline]
sock_close+0xb8/0x1fc net/socket.c:1370
__fput+0x30c/0x7bc fs/file_table.c:320
____fput+0x20/0x30 fs/file_table.c:348
task_work_run+0x240/0x2f0 kernel/task_work.c:179
exit_task_work include/linux/task_work.h:38 [inline]
do_exit+0x554/0x1a88 kernel/exit.c:869
do_group_exit+0x194/0x22c kernel/exit.c:1019
get_signal+0x14a0/0x158c kernel/signal.c:2862
do_signal arch/arm64/kernel/signal.c:1076 [inline]
do_notify_resume+0x3ac/0x3470 arch/arm64/kernel/signal.c:1129
prepare_exit_to_user_mode arch/arm64/kernel/entry-common.c:137 [inline]
exit_to_user_mode arch/arm64/kernel/entry-common.c:142 [inline]
el0_svc+0x9c/0x168 arch/arm64/kernel/entry-common.c:638
el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:581