INFO: task krfcommd:2893 blocked for more than 143 seconds. Not tainted 5.14.0-rc5-next-20210813-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:krfcommd state:D stack:29592 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-executor669:6620 blocked for more than 143 seconds. Not tainted 5.14.0-rc5-next-20210813-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor669 state:D stack:27440 pid: 6620 ppid: 6588 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+0xbae/0x2a30 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: 0033:0x445fe9 RSP: 002b:00007ffd638fe028 EFLAGS: 00000246 ORIG_RAX: 000000000000002a RAX: fffffffffffffffc RBX: 0000000000000003 RCX: 0000000000445fe9 RDX: 0000000000000080 RSI: 0000000020000000 RDI: 0000000000000004 RBP: 0000000000000003 R08: 000000ff00000001 R09: 000000ff00000001 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000f682b8 R13: 0000000000000072 R14: 00007ffd638fe080 R15: 0000000000000003 INFO: lockdep is turned off. NMI backtrace for cpu 0 CPU: 0 PID: 26 Comm: khungtaskd Not tainted 5.14.0-rc5-next-20210813-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: 2595 Comm: kworker/u4:6 Not tainted 5.14.0-rc5-next-20210813-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events_unbound toggle_allocation_gate RIP: 0010:inat_get_opcode_attribute+0x0/0x50 arch/x86/lib/inat.c:14 Code: 8b 10 31 c0 0f 1f 00 c3 66 90 0f 1f 00 0f ae e8 48 8b 10 31 c0 0f 1f 00 c3 90 0f 1f 00 31 d2 48 c7 c0 f2 ff ff ff c3 cc cc cc <53> 89 fb e8 f8 05 81 fd 0f b6 db 48 b8 00 00 00 00 00 fc ff df 48 RSP: 0018:ffffc9000a5cf900 EFLAGS: 00000246 RAX: ffffffff81bb13e9 RBX: 0000000000000001 RCX: 0000000000000001 RDX: 1ffffffff037627d RSI: ffffffff83f5255d RDI: 00000000000000e9 RBP: dffffc0000000000 R08: 0000000000000001 R09: 000000000000000f R10: ffffffff83f524db R11: 00000000000000e9 R12: 0000000000000000 R13: 00000000000000e9 R14: dffffc0000000000 R15: 00000000000000e9 FS: 0000000000000000(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fadfa653000 CR3: 000000000b68e000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: insn_get_prefixes.part.0+0x293/0x1200 arch/x86/lib/insn.c:138 insn_get_prefixes arch/x86/lib/insn.c:130 [inline] insn_get_opcode arch/x86/lib/insn.c:271 [inline] insn_get_modrm+0x646/0x7c0 arch/x86/lib/insn.c:342 insn_get_sib+0x29c/0x330 arch/x86/lib/insn.c:420 insn_get_displacement+0x31c/0x660 arch/x86/lib/insn.c:463 insn_get_immediate arch/x86/lib/insn.c:631 [inline] insn_get_length arch/x86/lib/insn.c:706 [inline] insn_decode+0x473/0x4e0 arch/x86/lib/insn.c:746 arch_jump_entry_size+0xa0/0x110 arch/x86/kernel/jump_label.c:24 __jump_label_patch+0x7c/0x1b0 arch/x86/kernel/jump_label.c:45 arch_jump_label_transform_queue+0x63/0x100 arch/x86/kernel/jump_label.c:137 __jump_label_update+0x12e/0x400 kernel/jump_label.c:451 jump_label_update+0x1d5/0x430 kernel/jump_label.c:830 static_key_disable_cpuslocked+0x152/0x1b0 kernel/jump_label.c:207 static_key_disable+0x16/0x20 kernel/jump_label.c:215 toggle_allocation_gate mm/kfence/core.c:640 [inline] toggle_allocation_gate+0x185/0x390 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 INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.542 msecs ---------------- Code disassembly (best guess): 0: 8b 10 mov (%rax),%edx 2: 31 c0 xor %eax,%eax 4: 0f 1f 00 nopl (%rax) 7: c3 retq 8: 66 90 xchg %ax,%ax a: 0f 1f 00 nopl (%rax) d: 0f ae e8 lfence 10: 48 8b 10 mov (%rax),%rdx 13: 31 c0 xor %eax,%eax 15: 0f 1f 00 nopl (%rax) 18: c3 retq 19: 90 nop 1a: 0f 1f 00 nopl (%rax) 1d: 31 d2 xor %edx,%edx 1f: 48 c7 c0 f2 ff ff ff mov $0xfffffffffffffff2,%rax 26: c3 retq 27: cc int3 28: cc int3 29: cc int3 2a: 53 push %rbx <-- trapping instruction 2b: 89 fb mov %edi,%ebx 2d: e8 f8 05 81 fd callq 0xfd81062a 32: 0f b6 db movzbl %bl,%ebx 35: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 3c: fc ff df 3f: 48 rex.W