======================================================
WARNING: possible circular locking dependency detected
6.12.0-rc1-syzkaller-00330-gfc20a3e57247 #0 Not tainted
------------------------------------------------------
syz.1.1615/12258 is trying to acquire lock:
ffff8880672a3258 (sk_lock-AF_BLUETOOTH-BTPROTO_RFCOMM){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1609 [inline]
ffff8880672a3258 (sk_lock-AF_BLUETOOTH-BTPROTO_RFCOMM){+.+.}-{0:0}, at: rfcomm_sk_state_change+0x5b/0x310 net/bluetooth/rfcomm/sock.c:73
but task is already holding lock:
ffff8880660c0928 (&d->lock){+.+.}-{3:3}, at: __rfcomm_dlc_close+0x226/0x6a0 net/bluetooth/rfcomm/core.c:491
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #3 (&d->lock){+.+.}-{3:3}:
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5825
__mutex_lock_common kernel/locking/mutex.c:608 [inline]
__mutex_lock+0x136/0xd70 kernel/locking/mutex.c:752
__rfcomm_dlc_close+0x226/0x6a0 net/bluetooth/rfcomm/core.c:491
rfcomm_dlc_close+0xf1/0x190 net/bluetooth/rfcomm/core.c:524
__rfcomm_sock_close+0x121/0x250 net/bluetooth/rfcomm/sock.c:220
rfcomm_sock_shutdown+0xb8/0x240 net/bluetooth/rfcomm/sock.c:901
__sys_shutdown_sock net/socket.c:2443 [inline]
__sys_shutdown net/socket.c:2455 [inline]
__do_sys_shutdown net/socket.c:2463 [inline]
__se_sys_shutdown+0x144/0x1b0 net/socket.c:2461
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
-> #2 (rfcomm_mutex){+.+.}-{3:3}:
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5825
__mutex_lock_common kernel/locking/mutex.c:608 [inline]
__mutex_lock+0x136/0xd70 kernel/locking/mutex.c:752
rfcomm_dlc_exists+0xa6/0x380 net/bluetooth/rfcomm/core.c:546
__rfcomm_create_dev net/bluetooth/rfcomm/tty.c:414 [inline]
rfcomm_create_dev net/bluetooth/rfcomm/tty.c:485 [inline]
rfcomm_dev_ioctl+0xb53/0x2220 net/bluetooth/rfcomm/tty.c:584
rfcomm_sock_ioctl+0x86/0xd0 net/bluetooth/rfcomm/sock.c:869
sock_do_ioctl+0x158/0x460 net/socket.c:1227
sock_ioctl+0x626/0x8e0 net/socket.c:1346
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:907 [inline]
__se_sys_ioctl+0xf9/0x170 fs/ioctl.c:893
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
-> #1 (rfcomm_ioctl_mutex){+.+.}-{3:3}:
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5825
__mutex_lock_common kernel/locking/mutex.c:608 [inline]
__mutex_lock+0x136/0xd70 kernel/locking/mutex.c:752
rfcomm_create_dev net/bluetooth/rfcomm/tty.c:484 [inline]
rfcomm_dev_ioctl+0x237/0x2220 net/bluetooth/rfcomm/tty.c:584
rfcomm_sock_ioctl+0x86/0xd0 net/bluetooth/rfcomm/sock.c:869
sock_do_ioctl+0x158/0x460 net/socket.c:1227
sock_ioctl+0x626/0x8e0 net/socket.c:1346
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:907 [inline]
__se_sys_ioctl+0xf9/0x170 fs/ioctl.c:893
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
-> #0 (sk_lock-AF_BLUETOOTH-BTPROTO_RFCOMM){+.+.}-{0:0}:
check_prev_add kernel/locking/lockdep.c:3161 [inline]
check_prevs_add kernel/locking/lockdep.c:3280 [inline]
validate_chain+0x18ef/0x5920 kernel/locking/lockdep.c:3904
__lock_acquire+0x1384/0x2050 kernel/locking/lockdep.c:5202
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5825
lock_sock_nested+0x48/0x100 net/core/sock.c:3611
lock_sock include/net/sock.h:1609 [inline]
rfcomm_sk_state_change+0x5b/0x310 net/bluetooth/rfcomm/sock.c:73
__rfcomm_dlc_close+0x26f/0x6a0 net/bluetooth/rfcomm/core.c:493
rfcomm_dlc_close+0xf1/0x190 net/bluetooth/rfcomm/core.c:524
__rfcomm_sock_close+0x121/0x250 net/bluetooth/rfcomm/sock.c:220
rfcomm_sock_shutdown+0xb8/0x240 net/bluetooth/rfcomm/sock.c:901
__sys_shutdown_sock net/socket.c:2443 [inline]
__sys_shutdown net/socket.c:2455 [inline]
__do_sys_shutdown net/socket.c:2463 [inline]
__se_sys_shutdown+0x144/0x1b0 net/socket.c:2461
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
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 ***
2 locks held by syz.1.1615/12258:
#0: ffffffff8fe4d548 (rfcomm_mutex){+.+.}-{3:3}, at: rfcomm_dlc_close+0x3b/0x190 net/bluetooth/rfcomm/core.c:511
#1: ffff8880660c0928 (&d->lock){+.+.}-{3:3}, at: __rfcomm_dlc_close+0x226/0x6a0 net/bluetooth/rfcomm/core.c:491
stack backtrace:
CPU: 0 UID: 0 PID: 12258 Comm: syz.1.1615 Not tainted 6.12.0-rc1-syzkaller-00330-gfc20a3e57247 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
print_circular_bug+0x13a/0x1b0 kernel/locking/lockdep.c:2074
check_noncircular+0x36a/0x4a0 kernel/locking/lockdep.c:2206
check_prev_add kernel/locking/lockdep.c:3161 [inline]
check_prevs_add kernel/locking/lockdep.c:3280 [inline]
validate_chain+0x18ef/0x5920 kernel/locking/lockdep.c:3904
__lock_acquire+0x1384/0x2050 kernel/locking/lockdep.c:5202
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5825
lock_sock_nested+0x48/0x100 net/core/sock.c:3611
lock_sock include/net/sock.h:1609 [inline]
rfcomm_sk_state_change+0x5b/0x310 net/bluetooth/rfcomm/sock.c:73
__rfcomm_dlc_close+0x26f/0x6a0 net/bluetooth/rfcomm/core.c:493
rfcomm_dlc_close+0xf1/0x190 net/bluetooth/rfcomm/core.c:524
__rfcomm_sock_close+0x121/0x250 net/bluetooth/rfcomm/sock.c:220
rfcomm_sock_shutdown+0xb8/0x240 net/bluetooth/rfcomm/sock.c:901
__sys_shutdown_sock net/socket.c:2443 [inline]
__sys_shutdown net/socket.c:2455 [inline]
__do_sys_shutdown net/socket.c:2463 [inline]
__se_sys_shutdown+0x144/0x1b0 net/socket.c:2461
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f3bdf57dff9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f3be0330038 EFLAGS: 00000246 ORIG_RAX: 0000000000000030
RAX: ffffffffffffffda RBX: 00007f3bdf736130 RCX: 00007f3bdf57dff9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000008
RBP: 00007f3bdf5f0296 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000001 R14: 00007f3bdf736130 R15: 00007ffe0ad00368
</TASK>