INFO: task syz-executor.3:27012 blocked for more than 143 seconds. Not tainted 5.14.0-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.3 state:D stack:28616 pid:27012 ppid: 8455 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:4940 [inline] __schedule+0x940/0x26f0 kernel/sched/core.c:6287 schedule+0xd3/0x270 kernel/sched/core.c:6366 schedule_timeout+0x1db/0x2a0 kernel/time/timer.c:1857 do_wait_for_common kernel/sched/completion.c:85 [inline] __wait_for_common kernel/sched/completion.c:106 [inline] wait_for_common kernel/sched/completion.c:117 [inline] wait_for_completion_timeout+0x171/0x280 kernel/sched/completion.c:157 usb_start_wait_urb+0x144/0x4c0 drivers/usb/core/message.c:63 usb_bulk_msg+0x226/0x550 drivers/usb/core/message.c:387 do_proc_bulk+0x3a3/0x750 drivers/usb/core/devio.c:1236 proc_bulk drivers/usb/core/devio.c:1273 [inline] usbdev_do_ioctl drivers/usb/core/devio.c:2547 [inline] usbdev_ioctl+0x586/0x36c0 drivers/usb/core/devio.c:2713 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:874 [inline] __se_sys_ioctl fs/ioctl.c:860 [inline] __x64_sys_ioctl+0x193/0x200 fs/ioctl.c:860 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x4665f9 RSP: 002b:00007fc4daa55188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 00000000004665f9 RDX: 0000000020000740 RSI: 00000000c0185502 RDI: 0000000000000003 RBP: 00000000004bfcc4 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf80 R13: 00007ffe660b77bf R14: 00007fc4daa55300 R15: 0000000000022000 Showing all locks held in the system: 1 lock held by khungtaskd/1636: #0: ffffffff8b97cf20 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6446 2 locks held by in:imklog/8114: #0: ffff888029e92670 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:990 #1: ffff8880b9d31ad8 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested kernel/sched/core.c:474 [inline] #1: ffff8880b9d31ad8 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock kernel/sched/sched.h:1317 [inline] #1: ffff8880b9d31ad8 (&rq->__lock){-.-.}-{2:2}, at: rq_lock kernel/sched/sched.h:1620 [inline] #1: ffff8880b9d31ad8 (&rq->__lock){-.-.}-{2:2}, at: __schedule+0x236/0x26f0 kernel/sched/core.c:6201 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1636 Comm: khungtaskd Not tainted 5.14.0-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:105 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:210 [inline] watchdog+0xc1d/0xf50 kernel/hung_task.c:295 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: 4840 Comm: systemd-journal Not tainted 5.14.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__exit_to_user_mode kernel/entry/common.c:132 [inline] RIP: 0010:syscall_exit_to_user_mode+0x33/0x60 kernel/entry/common.c:304 Code: 9c 58 fa f6 c4 02 75 39 48 89 ef e8 c7 fc 2d f8 e8 d2 0d 46 f8 48 8b 7c 24 08 e8 78 d3 24 f8 eb 14 66 90 0f 00 2d 9d 3b 58 00 <48> 8b 7c 24 08 5d e9 b2 f3 ff ff bf 01 00 00 00 e8 08 03 00 00 eb RSP: 0018:ffffc90001767f30 EFLAGS: 000000d3 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: ffff88801981e280 RSI: ffffffff893568b8 RDI: 0000000000000000 RBP: ffffc90001767f58 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000001 R12: ffffc90001767f58 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 FS: 00007fa6cf8768c0(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fa6ccf59000 CR3: 00000000183fc000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7fa6ceb0ef17 Code: ff ff ff 48 8b 4d a0 0f b7 51 fe 48 8b 4d a8 66 89 54 08 fe e9 1a ff ff ff 66 2e 0f 1f 84 00 00 00 00 00 b8 27 00 00 00 0f 05 0f 1f 84 00 00 00 00 00 b8 6e 00 00 00 0f 05 c3 0f 1f 84 00 00 RSP: 002b:00007ffe34139c38 EFLAGS: 00000202 ORIG_RAX: 0000000000000027 RAX: 00000000000012e8 RBX: 00005629e52fc200 RCX: 00007fa6ceb0ef17 RDX: 00007ffe34139cf8 RSI: 0000000000000001 RDI: 00005629e52fc200 RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000069 R11: 0000000000000202 R12: 00007ffe34139cf8 R13: 00000000000012e8 R14: 00007ffe3413cae0 R15: 00007ffe3413a0f0 ---------------- Code disassembly (best guess): 0: 9c pushfq 1: 58 pop %rax 2: fa cli 3: f6 c4 02 test $0x2,%ah 6: 75 39 jne 0x41 8: 48 89 ef mov %rbp,%rdi b: e8 c7 fc 2d f8 callq 0xf82dfcd7 10: e8 d2 0d 46 f8 callq 0xf8460de7 15: 48 8b 7c 24 08 mov 0x8(%rsp),%rdi 1a: e8 78 d3 24 f8 callq 0xf824d397 1f: eb 14 jmp 0x35 21: 66 90 xchg %ax,%ax 23: 0f 00 2d 9d 3b 58 00 verw 0x583b9d(%rip) # 0x583bc7 * 2a: 48 8b 7c 24 08 mov 0x8(%rsp),%rdi <-- trapping instruction 2f: 5d pop %rbp 30: e9 b2 f3 ff ff jmpq 0xfffff3e7 35: bf 01 00 00 00 mov $0x1,%edi 3a: e8 08 03 00 00 callq 0x347 3f: eb .byte 0xeb