INFO: task krfcommd:2708 blocked for more than 143 seconds. Tainted: G W 5.17.0-syzkaller-13034-gd888c83fcec7 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:krfcommd state:D stack:29176 pid: 2708 ppid: 2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:5073 [inline] __schedule+0x937/0x1090 kernel/sched/core.c:6382 schedule+0xeb/0x1b0 kernel/sched/core.c:6454 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6513 __mutex_lock_common+0xd1f/0x2590 kernel/locking/mutex.c:673 __mutex_lock kernel/locking/mutex.c:733 [inline] mutex_lock_nested+0x1a/0x20 kernel/locking/mutex.c:785 rfcomm_process_sessions+0x21/0x3f0 net/bluetooth/rfcomm/core.c:2015 rfcomm_run+0x195/0x2c0 net/bluetooth/rfcomm/core.c:2122 kthread+0x2a3/0x2d0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 INFO: task syz-executor365:3631 blocked for more than 143 seconds. Tainted: G W 5.17.0-syzkaller-13034-gd888c83fcec7 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor365 state:D stack:26552 pid: 3631 ppid: 3625 flags:0x00004006 Call Trace: context_switch kernel/sched/core.c:5073 [inline] __schedule+0x937/0x1090 kernel/sched/core.c:6382 schedule+0xeb/0x1b0 kernel/sched/core.c:6454 __lock_sock+0x1cf/0x330 net/core/sock.c:2770 lock_sock_nested+0x9f/0x100 net/core/sock.c:3317 lock_sock include/net/sock.h:1682 [inline] rfcomm_sk_state_change+0x63/0x300 net/bluetooth/rfcomm/sock.c:73 __rfcomm_dlc_close+0x2cc/0x480 net/bluetooth/rfcomm/core.c:489 rfcomm_dlc_close+0x10d/0x1c0 net/bluetooth/rfcomm/core.c:520 __rfcomm_sock_close+0x101/0x220 net/bluetooth/rfcomm/sock.c:220 rfcomm_sock_shutdown+0xa5/0x220 net/bluetooth/rfcomm/sock.c:905 rfcomm_sock_release+0x55/0x120 net/bluetooth/rfcomm/sock.c:925 __sock_release net/socket.c:650 [inline] sock_close+0xd8/0x260 net/socket.c:1318 __fput+0x3f6/0x860 fs/file_table.c:317 task_work_run+0x146/0x1c0 kernel/task_work.c:164 exit_task_work include/linux/task_work.h:37 [inline] do_exit+0x5e3/0x20c0 kernel/exit.c:795 do_group_exit+0x2af/0x2b0 kernel/exit.c:925 get_signal+0x23bd/0x23c0 kernel/signal.c:2904 arch_do_signal_or_restart+0x8e/0x740 arch/x86/kernel/signal.c:867 exit_to_user_mode_loop kernel/entry/common.c:180 [inline] exit_to_user_mode_prepare+0x128/0x1f0 kernel/entry/common.c:215 __syscall_exit_to_user_mode_work kernel/entry/common.c:297 [inline] syscall_exit_to_user_mode+0x2e/0x70 kernel/entry/common.c:308 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f5789bd01b9 RSP: 002b:00007fff20bc4178 EFLAGS: 00000246 ORIG_RAX: 000000000000002a RAX: fffffffffffffffc RBX: 0000000000000003 RCX: 00007f5789bd01b9 RDX: 000000000000005a RSI: 0000000020000000 RDI: 0000000000000004 RBP: 0000000000000003 R08: 000000ff00000001 R09: 000000ff00000001 R10: 0000000000000000 R11: 0000000000000246 R12: 0000555555b182b8 R13: 0000000000000072 R14: 00007fff20bc41d0 R15: 0000000000000003 INFO: lockdep is turned off. NMI backtrace for cpu 0 CPU: 0 PID: 28 Comm: khungtaskd Tainted: G W 5.17.0-syzkaller-13034-gd888c83fcec7 #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+0x1dc/0x2d8 lib/dump_stack.c:106 nmi_cpu_backtrace+0x45f/0x490 lib/nmi_backtrace.c:111 nmi_trigger_cpumask_backtrace+0x16a/0x280 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:212 [inline] watchdog+0xc82/0xcd0 kernel/hung_task.c:369 kthread+0x2a3/0x2d0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 983 Comm: kworker/u4:4 Tainted: G W 5.17.0-syzkaller-13034-gd888c83fcec7 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events_unbound toggle_allocation_gate RIP: 0010:insn_get_prefixes+0xbef/0x1930 arch/x86/lib/insn.c:195 Code: 44 8a 6d 00 41 0f b6 fd e8 be 99 ff ff 41 89 c4 41 83 e4 0f 41 8d 5c 24 f3 bf 02 00 00 00 89 de e8 86 c5 28 fd 83 fb 03 72 0a 6c c1 28 fd e9 c5 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 8b RSP: 0018:ffffc90004f7f638 EFLAGS: 00000286 RAX: 0000000000000000 RBX: 00000000fffffff3 RCX: dffffc0000000000 RDX: ffff88801d405700 RSI: 00000000fffffff3 RDI: 0000000000000002 RBP: ffffffff81d6dd5e R08: ffffffff845d45ca R09: ffffc90004f7f980 R10: fffff520009eff3b R11: 0000000000000000 R12: 0000000000000000 R13: ffffc90004f7f9e9 R14: ffffc90004f7f9e0 R15: 1ffff920009eff3a FS: 0000000000000000(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00005579209be000 CR3: 000000000ca8e000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: insn_get_opcode+0x1c5/0xa90 arch/x86/lib/insn.c:272 insn_get_modrm+0x205/0x760 arch/x86/lib/insn.c:343 insn_get_sib arch/x86/lib/insn.c:421 [inline] insn_get_displacement+0x12a/0xa90 arch/x86/lib/insn.c:464 insn_get_immediate+0x404/0x1fe0 arch/x86/lib/insn.c:632 insn_get_length arch/x86/lib/insn.c:707 [inline] insn_decode+0x350/0x4c0 arch/x86/lib/insn.c:747 arch_jump_entry_size arch/x86/kernel/jump_label.c:24 [inline] __jump_label_patch+0xdf/0x410 arch/x86/kernel/jump_label.c:45 arch_jump_label_transform_queue+0x49/0xd0 arch/x86/kernel/jump_label.c:137 __jump_label_update+0x15d/0x350 kernel/jump_label.c:451 static_key_disable_cpuslocked+0xcc/0x1b0 kernel/jump_label.c:207 static_key_disable+0x16/0x20 kernel/jump_label.c:215 toggle_allocation_gate+0x3c8/0x460 mm/kfence/core.c:793 process_one_work+0x83c/0x11a0 kernel/workqueue.c:2289 worker_thread+0xa6c/0x1290 kernel/workqueue.c:2436 kthread+0x2a3/0x2d0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 ---------------- Code disassembly (best guess): 0: 44 8a 6d 00 mov 0x0(%rbp),%r13b 4: 41 0f b6 fd movzbl %r13b,%edi 8: e8 be 99 ff ff callq 0xffff99cb d: 41 89 c4 mov %eax,%r12d 10: 41 83 e4 0f and $0xf,%r12d 14: 41 8d 5c 24 f3 lea -0xd(%r12),%ebx 19: bf 02 00 00 00 mov $0x2,%edi 1e: 89 de mov %ebx,%esi 20: e8 86 c5 28 fd callq 0xfd28c5ab 25: 83 fb 03 cmp $0x3,%ebx 28: 72 0a jb 0x34 * 2a: e8 6c c1 28 fd callq 0xfd28c19b <-- trapping instruction 2f: e9 c5 00 00 00 jmpq 0xf9 34: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 3b: fc ff df 3e: 48 rex.W 3f: 8b .byte 0x8b