------------[ cut here ]------------
======================================================
WARNING: possible circular locking dependency detected
6.7.0-rc4-next-20231205-syzkaller #0 Not tainted
------------------------------------------------------
syz-executor.4/8520 is trying to acquire lock:
ffffffff8d19a0f8 ((console_sem).lock){-.-.}-{2:2}, at: down_trylock+0x12/0x70 kernel/locking/semaphore.c:139

but task is already holding lock:
ffffffff8dc76638 (pool_rwlock){----}-{2:2}, at: stack_depot_put lib/stackdepot.c:621 [inline]
ffffffff8dc76638 (pool_rwlock){----}-{2:2}, at: stack_depot_put+0x24/0x110 lib/stackdepot.c:613

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #3 (pool_rwlock){----}-{2:2}:
       __raw_read_lock_irqsave include/linux/rwlock_api_smp.h:160 [inline]
       _raw_read_lock_irqsave+0x46/0x90 kernel/locking/spinlock.c:236
       stack_depot_save_flags+0x169/0x740 lib/stackdepot.c:508
       kasan_save_stack+0x42/0x50 mm/kasan/common.c:48
       __kasan_record_aux_stack+0xc2/0xd0 mm/kasan/generic.c:517
       task_work_add+0x88/0x2a0 kernel/task_work.c:48
       task_tick_numa kernel/sched/fair.c:3512 [inline]
       task_tick_fair+0x5a5/0xc30 kernel/sched/fair.c:12599
       scheduler_tick+0x210/0x650 kernel/sched/core.c:5674
       update_process_times+0x19e/0x220 kernel/time/timer.c:2076
       tick_sched_handle+0x8e/0x170 kernel/time/tick-sched.c:255
       tick_nohz_highres_handler+0xe9/0x110 kernel/time/tick-sched.c:1516
       __run_hrtimer kernel/time/hrtimer.c:1688 [inline]
       __hrtimer_run_queues+0x654/0xc20 kernel/time/hrtimer.c:1752
       hrtimer_interrupt+0x31b/0x800 kernel/time/hrtimer.c:1814
       local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1065 [inline]
       __sysvec_apic_timer_interrupt+0x10c/0x410 arch/x86/kernel/apic/apic.c:1082
       sysvec_apic_timer_interrupt+0x90/0xb0 arch/x86/kernel/apic/apic.c:1076
       asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:645
       lock_acquire+0x1f2/0x530 kernel/locking/lockdep.c:5722
       down_write+0x3a/0x50 kernel/locking/rwsem.c:1579
       vma_start_write include/linux/mm.h:716 [inline]
       __split_vma+0x923/0x1190 mm/mmap.c:2360
       do_vmi_align_munmap+0x2c2/0x1ad0 mm/mmap.c:2531
       do_vmi_munmap+0x20b/0x440 mm/mmap.c:2690
       __vm_munmap+0x145/0x390 mm/mmap.c:2977
       elf_map fs/binfmt_elf.c:383 [inline]
       elf_load+0x4ce/0x870 fs/binfmt_elf.c:408
       load_elf_interp fs/binfmt_elf.c:675 [inline]
       load_elf_binary+0x3436/0x4e10 fs/binfmt_elf.c:1200
       search_binary_handler fs/exec.c:1736 [inline]
       exec_binprm fs/exec.c:1778 [inline]
       bprm_execve fs/exec.c:1853 [inline]
       bprm_execve+0x7ef/0x1a80 fs/exec.c:1809
       kernel_execve+0x3d7/0x4e0 fs/exec.c:2021
       try_to_run_init_process init/main.c:1364 [inline]
       kernel_init+0x137/0x2a0 init/main.c:1497
       ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
       ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242

-> #2 (&rq->__lock){-.-.}-{2:2}:
       _raw_spin_lock_nested+0x31/0x40 kernel/locking/spinlock.c:378
       raw_spin_rq_lock_nested+0x29/0x130 kernel/sched/core.c:558
       raw_spin_rq_lock kernel/sched/sched.h:1385 [inline]
       rq_lock kernel/sched/sched.h:1699 [inline]
       task_fork_fair+0x70/0x240 kernel/sched/fair.c:12619
       sched_cgroup_fork+0x3cf/0x510 kernel/sched/core.c:4835
       copy_process+0x6a38/0x9770 kernel/fork.c:2601
       kernel_clone+0xfd/0x940 kernel/fork.c:2899
       user_mode_thread+0xb4/0xf0 kernel/fork.c:2977
       rest_init+0x27/0x2b0 init/main.c:695
       arch_call_rest_init+0x13/0x30 init/main.c:827
       start_kernel+0x39e/0x480 init/main.c:1072
       x86_64_start_reservations+0x18/0x30 arch/x86/kernel/head64.c:555
       x86_64_start_kernel+0xb2/0xc0 arch/x86/kernel/head64.c:536
       secondary_startup_64_no_verify+0x166/0x16b

-> #1 (&p->pi_lock){-.-.}-{2:2}:
       __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
       _raw_spin_lock_irqsave+0x3a/0x50 kernel/locking/spinlock.c:162
       class_raw_spinlock_irqsave_constructor include/linux/spinlock.h:522 [inline]
       try_to_wake_up+0x9a/0x13d0 kernel/sched/core.c:4252
       up+0x79/0xb0 kernel/locking/semaphore.c:191
       __up_console_sem kernel/printk/printk.c:340 [inline]
       __console_unlock kernel/printk/printk.c:2706 [inline]
       console_unlock+0x1cf/0x260 kernel/printk/printk.c:3038
       vprintk_emit+0x17f/0x5f0 kernel/printk/printk.c:2303
       vprintk+0x7b/0x90 kernel/printk/printk_safe.c:45
       _printk+0xc8/0x100 kernel/printk/printk.c:2328
       kauditd_printk_skb kernel/audit.c:546 [inline]
       kauditd_hold_skb+0x1fb/0x240 kernel/audit.c:581
       kauditd_send_queue+0x229/0x280 kernel/audit.c:766
       kauditd_thread+0x61e/0xa80 kernel/audit.c:890
       kthread+0x2c1/0x3a0 kernel/kthread.c:389
       ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
       ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242

-> #0 ((console_sem).lock){-.-.}-{2:2}:
       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+0x246e/0x3b30 kernel/locking/lockdep.c:5137
       lock_acquire kernel/locking/lockdep.c:5754 [inline]
       lock_acquire+0x1b1/0x530 kernel/locking/lockdep.c:5719
       __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
       _raw_spin_lock_irqsave+0x3a/0x50 kernel/locking/spinlock.c:162
       down_trylock+0x12/0x70 kernel/locking/semaphore.c:139
       __down_trylock_console_sem+0x40/0x140 kernel/printk/printk.c:323
       console_trylock+0x73/0x130 kernel/printk/printk.c:2659
       console_trylock_spinning kernel/printk/printk.c:1923 [inline]
       vprintk_emit+0x162/0x5f0 kernel/printk/printk.c:2302
       vprintk+0x7b/0x90 kernel/printk/printk_safe.c:45
       _printk+0xc8/0x100 kernel/printk/printk.c:2328
       __warn_printk+0x158/0x350 kernel/panic.c:721
       refcount_warn_saturate+0x149/0x210 lib/refcount.c:28
       __refcount_sub_and_test include/linux/refcount.h:283 [inline]
       __refcount_dec_and_test include/linux/refcount.h:315 [inline]
       refcount_dec_and_test include/linux/refcount.h:333 [inline]
       stack_depot_put lib/stackdepot.c:627 [inline]
       stack_depot_put+0xe4/0x110 lib/stackdepot.c:613
       __kasan_record_aux_stack+0xb3/0xd0 mm/kasan/generic.c:515
       insert_work+0x38/0x230 kernel/workqueue.c:1653
       __queue_work+0x633/0x11d0 kernel/workqueue.c:1802
       __queue_delayed_work+0x1bf/0x270 kernel/workqueue.c:1953
       mod_delayed_work_on+0xcc/0x1a0 kernel/workqueue.c:2027
       kblockd_mod_delayed_work_on+0x29/0x40 block/blk-core.c:1046
       blk_kick_flush block/blk-flush.c:348 [inline]
       blk_flush_complete_seq+0xa66/0x10c0 block/blk-flush.c:213
       mq_flush_data_end_io+0x2e3/0x580 block/blk-flush.c:376
       __blk_mq_end_request+0x248/0x4f0 block/blk-mq.c:1046
       scsi_end_request+0x444/0x9a0 drivers/scsi/scsi_lib.c:572
       scsi_io_completion+0x178/0x14c0 drivers/scsi/scsi_lib.c:975
       scsi_complete+0x124/0x250 drivers/scsi/scsi_lib.c:1437
       blk_complete_reqs+0xb2/0xf0 block/blk-mq.c:1131
       __do_softirq+0x216/0x8d5 kernel/softirq.c:553
       invoke_softirq kernel/softirq.c:427 [inline]
       __irq_exit_rcu kernel/softirq.c:632 [inline]
       irq_exit_rcu+0xb5/0x120 kernel/softirq.c:644
       common_interrupt+0xb0/0xd0 arch/x86/kernel/irq.c:247
       asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:636
       lock_acquire+0x1f2/0x530 kernel/locking/lockdep.c:5722
       lock_sock_nested+0x3a/0xf0 net/core/sock.c:3519
       lock_sock include/net/sock.h:1720 [inline]
       rfcomm_sock_recvmsg+0xd4/0x280 net/bluetooth/rfcomm/sock.c:608
       sock_recvmsg_nosec net/socket.c:1044 [inline]
       ____sys_recvmsg+0x4ab/0x5c0 net/socket.c:2801
       ___sys_recvmsg+0x115/0x1a0 net/socket.c:2845
       do_recvmmsg+0x2af/0x740 net/socket.c:2939
       __sys_recvmmsg net/socket.c:3020 [inline]
       __do_sys_recvmmsg net/socket.c:3041 [inline]
       __se_sys_recvmmsg net/socket.c:3034 [inline]
       __x64_sys_recvmmsg+0x1a6/0x290 net/socket.c:3034
       do_syscall_x64 arch/x86/entry/common.c:51 [inline]
       do_syscall_64+0x40/0x110 arch/x86/entry/common.c:82
       entry_SYSCALL_64_after_hwframe+0x62/0x6a

other info that might help us debug this:

Chain exists of:
  (console_sem).lock --> &rq->__lock --> pool_rwlock

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(pool_rwlock);
                               lock(&rq->__lock);
                               lock(pool_rwlock);
  lock((console_sem).lock);

 *** DEADLOCK ***

5 locks held by syz-executor.4/8520:
 #0: ffff888018e80130 (sk_lock-AF_BLUETOOTH-BTPROTO_RFCOMM){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1720 [inline]
 #0: ffff888018e80130 (sk_lock-AF_BLUETOOTH-BTPROTO_RFCOMM){+.+.}-{0:0}, at: rfcomm_sock_recvmsg+0xd4/0x280 net/bluetooth/rfcomm/sock.c:608
 #1: ffff88801e60fa18 (&fq->mq_flush_lock){..-.}-{2:2}, at: mq_flush_data_end_io+0x25c/0x580 block/blk-flush.c:369
 #2: ffffffff8d1ac6a0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:301 [inline]
 #2: ffffffff8d1ac6a0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:747 [inline]
 #2: ffffffff8d1ac6a0 (rcu_read_lock){....}-{1:2}, at: __queue_work+0xf2/0x11d0 kernel/workqueue.c:1730
 #3: ffff8880b993c2f8 (&pool->lock){-.-.}-{2:2}, at: __queue_work+0x39e/0x11d0 kernel/workqueue.c:1766
 #4: ffffffff8dc76638 (pool_rwlock){----}-{2:2}, at: stack_depot_put lib/stackdepot.c:621 [inline]
 #4: ffffffff8dc76638 (pool_rwlock){----}-{2:2}, at: stack_depot_put+0x24/0x110 lib/stackdepot.c:613

stack backtrace:
CPU: 1 PID: 8520 Comm: syz-executor.4 Not tainted 6.7.0-rc4-next-20231205-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xd9/0x1b0 lib/dump_stack.c:106
 check_noncircular+0x316/0x400 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+0x246e/0x3b30 kernel/locking/lockdep.c:5137
 lock_acquire kernel/locking/lockdep.c:5754 [inline]
 lock_acquire+0x1b1/0x530 kernel/locking/lockdep.c:5719
 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
 _raw_spin_lock_irqsave+0x3a/0x50 kernel/locking/spinlock.c:162
 down_trylock+0x12/0x70 kernel/locking/semaphore.c:139
 __down_trylock_console_sem+0x40/0x140 kernel/printk/printk.c:323
 console_trylock+0x73/0x130 kernel/printk/printk.c:2659
 console_trylock_spinning kernel/printk/printk.c:1923 [inline]
 vprintk_emit+0x162/0x5f0 kernel/printk/printk.c:2302
 vprintk+0x7b/0x90 kernel/printk/printk_safe.c:45
 _printk+0xc8/0x100 kernel/printk/printk.c:2328
 __warn_printk+0x158/0x350 kernel/panic.c:721
 refcount_warn_saturate+0x149/0x210 lib/refcount.c:28
 __refcount_sub_and_test include/linux/refcount.h:283 [inline]
 __refcount_dec_and_test include/linux/refcount.h:315 [inline]
 refcount_dec_and_test include/linux/refcount.h:333 [inline]
 stack_depot_put lib/stackdepot.c:627 [inline]
 stack_depot_put+0xe4/0x110 lib/stackdepot.c:613
 __kasan_record_aux_stack+0xb3/0xd0 mm/kasan/generic.c:515
 insert_work+0x38/0x230 kernel/workqueue.c:1653
 __queue_work+0x633/0x11d0 kernel/workqueue.c:1802
 __queue_delayed_work+0x1bf/0x270 kernel/workqueue.c:1953
 mod_delayed_work_on+0xcc/0x1a0 kernel/workqueue.c:2027
 kblockd_mod_delayed_work_on+0x29/0x40 block/blk-core.c:1046
 blk_kick_flush block/blk-flush.c:348 [inline]
 blk_flush_complete_seq+0xa66/0x10c0 block/blk-flush.c:213
 mq_flush_data_end_io+0x2e3/0x580 block/blk-flush.c:376
 __blk_mq_end_request+0x248/0x4f0 block/blk-mq.c:1046
 scsi_end_request+0x444/0x9a0 drivers/scsi/scsi_lib.c:572
 scsi_io_completion+0x178/0x14c0 drivers/scsi/scsi_lib.c:975
 scsi_complete+0x124/0x250 drivers/scsi/scsi_lib.c:1437
 blk_complete_reqs+0xb2/0xf0 block/blk-mq.c:1131
 __do_softirq+0x216/0x8d5 kernel/softirq.c:553
 invoke_softirq kernel/softirq.c:427 [inline]
 __irq_exit_rcu kernel/softirq.c:632 [inline]
 irq_exit_rcu+0xb5/0x120 kernel/softirq.c:644
 common_interrupt+0xb0/0xd0 arch/x86/kernel/irq.c:247
 </IRQ>
 <TASK>
 asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:636
RIP: 0010:lock_acquire+0x1f2/0x530 kernel/locking/lockdep.c:5722
Code: c1 05 7a 05 9a 7e 83 f8 01 0f 85 c4 02 00 00 9c 58 f6 c4 02 0f 85 af 02 00 00 48 85 ed 74 01 fb 48 b8 00 00 00 00 00 fc ff df <48> 01 c3 48 c7 03 00 00 00 00 48 c7 43 08 00 00 00 00 48 8b 84 24
RSP: 0018:ffffc900159ef8a0 EFLAGS: 00000206
RAX: dffffc0000000000 RBX: 1ffff92002b3df16 RCX: ffffffff816792ee
RDX: 0000000000000001 RSI: ffffffff8accb6a0 RDI: ffffffff8b2f13c0
RBP: 0000000000000200 R08: 0000000000000000 R09: fffffbfff2425a19
R10: ffffffff9212d0cf R11: 0000000000000000 R12: 0000000000000001
R13: 0000000000000000 R14: ffff888018e80130 R15: 0000000000000000
 lock_sock_nested+0x3a/0xf0 net/core/sock.c:3519
 lock_sock include/net/sock.h:1720 [inline]
 rfcomm_sock_recvmsg+0xd4/0x280 net/bluetooth/rfcomm/sock.c:608
 sock_recvmsg_nosec net/socket.c:1044 [inline]
 ____sys_recvmsg+0x4ab/0x5c0 net/socket.c:2801
 ___sys_recvmsg+0x115/0x1a0 net/socket.c:2845
 do_recvmmsg+0x2af/0x740 net/socket.c:2939
 __sys_recvmmsg net/socket.c:3020 [inline]
 __do_sys_recvmmsg net/socket.c:3041 [inline]
 __se_sys_recvmmsg net/socket.c:3034 [inline]
 __x64_sys_recvmmsg+0x1a6/0x290 net/socket.c:3034
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x40/0x110 arch/x86/entry/common.c:82
 entry_SYSCALL_64_after_hwframe+0x62/0x6a
RIP: 0033:0x7f18f907cae9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 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 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f18f9d9d0c8 EFLAGS: 00000246 ORIG_RAX: 000000000000012b
RAX: ffffffffffffffda RBX: 00007f18f919bf80 RCX: 00007f18f907cae9
RDX: 03ffffffffffff33 RSI: 0000000020000000 RDI: 0000000000000004
RBP: 00007f18f90c847a R08: 00000000200037c0 R09: 0000000000000000
R10: 0000000000003f00 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007f18f919bf80 R15: 00007fffe911aee8
 </TASK>
refcount_t: underflow; use-after-free.
WARNING: CPU: 1 PID: 8520 at lib/refcount.c:28 refcount_warn_saturate+0x14a/0x210 lib/refcount.c:28
Modules linked in:
CPU: 1 PID: 8520 Comm: syz-executor.4 Not tainted 6.7.0-rc4-next-20231205-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023
RIP: 0010:refcount_warn_saturate+0x14a/0x210 lib/refcount.c:28
Code: ff 89 de e8 98 f4 22 fd 84 db 0f 85 66 ff ff ff e8 5b f9 22 fd c6 05 d1 8b be 0a 01 90 48 c7 c7 80 b6 2e 8b e8 47 e8 e8 fc 90 <0f> 0b 90 90 e9 43 ff ff ff e8 38 f9 22 fd 0f b6 1d ac 8b be 0a 31
RSP: 0018:ffffc900001f0aa0 EFLAGS: 00010082
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff814e05d9
RDX: ffff8880193d5940 RSI: ffffffff814e05e6 RDI: 0000000000000001
RBP: ffff88807ca7621c R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000138db0 R12: ffff888017a988c0
R13: ffff8880186c9000 R14: ffff8880186c905c R15: ffff8880b993c340
FS:  00007f18f9d9d6c0(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000002069d030 CR3: 000000007a7c1000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 000000000000b937 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 __refcount_sub_and_test include/linux/refcount.h:283 [inline]
 __refcount_dec_and_test include/linux/refcount.h:315 [inline]
 refcount_dec_and_test include/linux/refcount.h:333 [inline]
 stack_depot_put lib/stackdepot.c:627 [inline]
 stack_depot_put+0xe4/0x110 lib/stackdepot.c:613
 __kasan_record_aux_stack+0xb3/0xd0 mm/kasan/generic.c:515
 insert_work+0x38/0x230 kernel/workqueue.c:1653
 __queue_work+0x633/0x11d0 kernel/workqueue.c:1802
 __queue_delayed_work+0x1bf/0x270 kernel/workqueue.c:1953
 mod_delayed_work_on+0xcc/0x1a0 kernel/workqueue.c:2027
 kblockd_mod_delayed_work_on+0x29/0x40 block/blk-core.c:1046
 blk_kick_flush block/blk-flush.c:348 [inline]
 blk_flush_complete_seq+0xa66/0x10c0 block/blk-flush.c:213
 mq_flush_data_end_io+0x2e3/0x580 block/blk-flush.c:376
 __blk_mq_end_request+0x248/0x4f0 block/blk-mq.c:1046
 scsi_end_request+0x444/0x9a0 drivers/scsi/scsi_lib.c:572
 scsi_io_completion+0x178/0x14c0 drivers/scsi/scsi_lib.c:975
 scsi_complete+0x124/0x250 drivers/scsi/scsi_lib.c:1437
 blk_complete_reqs+0xb2/0xf0 block/blk-mq.c:1131
 __do_softirq+0x216/0x8d5 kernel/softirq.c:553
 invoke_softirq kernel/softirq.c:427 [inline]
 __irq_exit_rcu kernel/softirq.c:632 [inline]
 irq_exit_rcu+0xb5/0x120 kernel/softirq.c:644
 common_interrupt+0xb0/0xd0 arch/x86/kernel/irq.c:247
 </IRQ>
 <TASK>
 asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:636
RIP: 0010:lock_acquire+0x1f2/0x530 kernel/locking/lockdep.c:5722
Code: c1 05 7a 05 9a 7e 83 f8 01 0f 85 c4 02 00 00 9c 58 f6 c4 02 0f 85 af 02 00 00 48 85 ed 74 01 fb 48 b8 00 00 00 00 00 fc ff df <48> 01 c3 48 c7 03 00 00 00 00 48 c7 43 08 00 00 00 00 48 8b 84 24
RSP: 0018:ffffc900159ef8a0 EFLAGS: 00000206
RAX: dffffc0000000000 RBX: 1ffff92002b3df16 RCX: ffffffff816792ee
RDX: 0000000000000001 RSI: ffffffff8accb6a0 RDI: ffffffff8b2f13c0
RBP: 0000000000000200 R08: 0000000000000000 R09: fffffbfff2425a19
R10: ffffffff9212d0cf R11: 0000000000000000 R12: 0000000000000001
R13: 0000000000000000 R14: ffff888018e80130 R15: 0000000000000000
 lock_sock_nested+0x3a/0xf0 net/core/sock.c:3519
 lock_sock include/net/sock.h:1720 [inline]
 rfcomm_sock_recvmsg+0xd4/0x280 net/bluetooth/rfcomm/sock.c:608
 sock_recvmsg_nosec net/socket.c:1044 [inline]
 ____sys_recvmsg+0x4ab/0x5c0 net/socket.c:2801
 ___sys_recvmsg+0x115/0x1a0 net/socket.c:2845
 do_recvmmsg+0x2af/0x740 net/socket.c:2939
 __sys_recvmmsg net/socket.c:3020 [inline]
 __do_sys_recvmmsg net/socket.c:3041 [inline]
 __se_sys_recvmmsg net/socket.c:3034 [inline]
 __x64_sys_recvmmsg+0x1a6/0x290 net/socket.c:3034
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x40/0x110 arch/x86/entry/common.c:82
 entry_SYSCALL_64_after_hwframe+0x62/0x6a
RIP: 0033:0x7f18f907cae9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 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 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f18f9d9d0c8 EFLAGS: 00000246 ORIG_RAX: 000000000000012b
RAX: ffffffffffffffda RBX: 00007f18f919bf80 RCX: 00007f18f907cae9
RDX: 03ffffffffffff33 RSI: 0000000020000000 RDI: 0000000000000004
RBP: 00007f18f90c847a R08: 00000000200037c0 R09: 0000000000000000
R10: 0000000000003f00 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007f18f919bf80 R15: 00007fffe911aee8
 </TASK>
----------------
Code disassembly (best guess):
   0:	c1 05 7a 05 9a 7e 83 	roll   $0x83,0x7e9a057a(%rip)        # 0x7e9a0581
   7:	f8                   	clc
   8:	01 0f                	add    %ecx,(%rdi)
   a:	85 c4                	test   %eax,%esp
   c:	02 00                	add    (%rax),%al
   e:	00 9c 58 f6 c4 02 0f 	add    %bl,0xf02c4f6(%rax,%rbx,2)
  15:	85 af 02 00 00 48    	test   %ebp,0x48000002(%rdi)
  1b:	85 ed                	test   %ebp,%ebp
  1d:	74 01                	je     0x20
  1f:	fb                   	sti
  20:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  27:	fc ff df
* 2a:	48 01 c3             	add    %rax,%rbx <-- trapping instruction
  2d:	48 c7 03 00 00 00 00 	movq   $0x0,(%rbx)
  34:	48 c7 43 08 00 00 00 	movq   $0x0,0x8(%rbx)
  3b:	00
  3c:	48                   	rex.W
  3d:	8b                   	.byte 0x8b
  3e:	84                   	.byte 0x84
  3f:	24                   	.byte 0x24