INFO: task krfcommd:2893 blocked for more than 143 seconds. Not tainted 5.14.0-rc5-next-20210812-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:krfcommd state:D stack:29640 pid: 2893 ppid: 2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:4711 [inline] __schedule+0x93a/0x26f0 kernel/sched/core.c:5966 schedule+0xd3/0x270 kernel/sched/core.c:6045 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6104 __mutex_lock_common kernel/locking/mutex.c:1036 [inline] __mutex_lock+0xa46/0x1300 kernel/locking/mutex.c:1096 rfcomm_process_sessions net/bluetooth/rfcomm/core.c:1979 [inline] rfcomm_run+0x2ed/0x4a20 net/bluetooth/rfcomm/core.c:2086 kthread+0x3e5/0x4d0 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 INFO: task syz-executor439:6591 blocked for more than 143 seconds. Not tainted 5.14.0-rc5-next-20210812-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor439 state:D stack:27704 pid: 6591 ppid: 6564 flags:0x00004006 Call Trace: context_switch kernel/sched/core.c:4711 [inline] __schedule+0x93a/0x26f0 kernel/sched/core.c:5966 schedule+0xd3/0x270 kernel/sched/core.c:6045 __lock_sock+0x13d/0x260 net/core/sock.c:2645 lock_sock_nested+0xf6/0x120 net/core/sock.c:3178 lock_sock include/net/sock.h:1612 [inline] rfcomm_sk_state_change+0xb4/0x390 net/bluetooth/rfcomm/sock.c:73 __rfcomm_dlc_close+0x1b6/0x8a0 net/bluetooth/rfcomm/core.c:489 rfcomm_dlc_close+0x1ea/0x240 net/bluetooth/rfcomm/core.c:520 __rfcomm_sock_close+0xac/0x260 net/bluetooth/rfcomm/sock.c:220 rfcomm_sock_shutdown+0xe9/0x210 net/bluetooth/rfcomm/sock.c:931 rfcomm_sock_release+0x5f/0x140 net/bluetooth/rfcomm/sock.c:951 __sock_release+0xcd/0x280 net/socket.c:649 sock_close+0x18/0x20 net/socket.c:1311 __fput+0x288/0x9f0 fs/file_table.c:280 task_work_run+0xdd/0x1a0 kernel/task_work.c:164 exit_task_work include/linux/task_work.h:32 [inline] do_exit+0xbd4/0x2a60 kernel/exit.c:825 do_group_exit+0x125/0x310 kernel/exit.c:922 get_signal+0x47f/0x2160 kernel/signal.c:2846 arch_do_signal_or_restart+0x2a9/0x1c40 arch/x86/kernel/signal.c:865 handle_signal_work kernel/entry/common.c:148 [inline] exit_to_user_mode_loop kernel/entry/common.c:172 [inline] exit_to_user_mode_prepare+0x17d/0x290 kernel/entry/common.c:209 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline] syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:302 do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x446009 RSP: 002b:00007ffc1aae5d68 EFLAGS: 00000246 ORIG_RAX: 000000000000002a RAX: fffffffffffffffc RBX: 0000000000000003 RCX: 0000000000446009 RDX: 0000000000000080 RSI: 0000000020000000 RDI: 0000000000000004 RBP: 0000000000000003 R08: 000000ff00000001 R09: 000000ff00000001 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000011df2b8 R13: 000000000000000e R14: 00007ffc1aae5dc0 R15: 0000000000000003 INFO: lockdep is turned off. NMI backtrace for cpu 0 CPU: 0 PID: 27 Comm: khungtaskd Not tainted 5.14.0-rc5-next-20210812-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 nmi_cpu_backtrace.cold+0x47/0x144 lib/nmi_backtrace.c:105 nmi_trigger_cpumask_backtrace+0x1ae/0x220 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:254 [inline] watchdog+0xcb7/0xed0 kernel/hung_task.c:339 kthread+0x3e5/0x4d0 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 6599 Comm: kworker/u4:1 Not tainted 5.14.0-rc5-next-20210812-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events_unbound toggle_allocation_gate RIP: 0010:lookup_object lib/debugobjects.c:198 [inline] RIP: 0010:debug_object_activate+0x172/0x3e0 lib/debugobjects.c:658 Code: 8b ab 40 1e 3c 90 31 db 48 85 ed 74 48 49 bd 00 00 00 00 00 fc ff df 48 8d 7d 18 83 c3 01 48 89 f8 48 c1 e8 03 42 80 3c 28 00 <0f> 85 c6 01 00 00 4c 3b 65 18 0f 84 bf 00 00 00 48 89 e8 48 c1 e8 RSP: 0018:ffffc900012ef9e0 EFLAGS: 00000046 RAX: 1ffff1100210b8ab RBX: 0000000000000003 RCX: ffffffff815b8c80 RDX: 1ffffffff20969cb RSI: 0000000000000006 RDI: ffff88801085c558 RBP: ffff88801085c540 R08: ffffffff904b4e48 R09: 0000000000000003 R10: fffff5200025df2a R11: 0000000000000000 R12: ffffffff8bac2508 R13: dffffc0000000000 R14: 1ffff9200025df3e R15: ffffffff898dcc40 FS: 0000000000000000(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f0fcbe40010 CR3: 000000000b68e000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: debug_timer_activate kernel/time/timer.c:729 [inline] __mod_timer+0x77d/0xe30 kernel/time/timer.c:1050 __queue_delayed_work+0x1a7/0x270 kernel/workqueue.c:1656 queue_delayed_work_on+0x105/0x120 kernel/workqueue.c:1681 queue_delayed_work include/linux/workqueue.h:522 [inline] toggle_allocation_gate mm/kfence/core.c:642 [inline] toggle_allocation_gate+0x1ca/0x390 mm/kfence/core.c:618 process_one_work+0x98d/0x1630 kernel/workqueue.c:2275 worker_thread+0x658/0x11f0 kernel/workqueue.c:2421 kthread+0x3e5/0x4d0 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 ---------------- Code disassembly (best guess): 0: 8b ab 40 1e 3c 90 mov -0x6fc3e1c0(%rbx),%ebp 6: 31 db xor %ebx,%ebx 8: 48 85 ed test %rbp,%rbp b: 74 48 je 0x55 d: 49 bd 00 00 00 00 00 movabs $0xdffffc0000000000,%r13 14: fc ff df 17: 48 8d 7d 18 lea 0x18(%rbp),%rdi 1b: 83 c3 01 add $0x1,%ebx 1e: 48 89 f8 mov %rdi,%rax 21: 48 c1 e8 03 shr $0x3,%rax 25: 42 80 3c 28 00 cmpb $0x0,(%rax,%r13,1) 2a: 0f 85 c6 01 00 00 jne 0x1f6 <-- trapping instruction 30: 4c 3b 65 18 cmp 0x18(%rbp),%r12 34: 0f 84 bf 00 00 00 je 0xf9 3a: 48 89 e8 mov %rbp,%rax 3d: 48 rex.W 3e: c1 .byte 0xc1 3f: e8 .byte 0xe8