INFO: task syz-executor.5:6486 blocked for more than 143 seconds. Not tainted 5.15.0-rc3-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.5 state:D stack:26712 pid: 6486 ppid: 10723 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: 0033:0x7f26cbfd8709 RSP: 002b:00007f26c954f188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f26cc0dcf60 RCX: 00007f26cbfd8709 RDX: 0000000020000580 RSI: 00000000c0185502 RDI: 0000000000000004 RBP: 00007f26cc032cb4 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffee5fb8f1f R14: 00007f26c954f300 R15: 0000000000022000 Showing all locks held in the system: 1 lock held by khungtaskd/27: #0: ffffffff8b97fe60 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6446 1 lock held by systemd-journal/2965: 2 locks held by in:imklog/6224: #0: ffff88801a9b4370 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:990 #1: ffff888014bb2428 (&mm->mmap_lock#2){++++}-{3:3}, at: file_ctx security/apparmor/include/file.h:33 [inline] #1: ffff888014bb2428 (&mm->mmap_lock#2){++++}-{3:3}, at: aa_file_perm+0x119/0x1180 security/apparmor/file.c:609 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 27 Comm: khungtaskd Not tainted 5.15.0-rc3-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: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 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 154 Comm: kworker/u4:2 Not tainted 5.15.0-rc3-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: phy17 ieee80211_iface_work RIP: 0010:mark_lock+0x151/0x17b0 kernel/locking/lockdep.c:4554 Code: 12 00 00 48 89 ee 48 23 70 50 41 ba 01 00 00 00 0f 84 79 01 00 00 48 b8 00 00 00 00 00 fc ff df 48 01 c3 48 c7 03 00 00 00 00 43 08 00 00 00 00 48 c7 43 10 00 00 00 00 48 8b 84 24 10 01 00 RSP: 0018:ffffc90001fefab0 EFLAGS: 00000082 RAX: dffffc0000000000 RBX: fffff520003fdf5d RCX: 1ffffffff1faa942 RDX: dffffc0000000000 RSI: 0000000000000004 RDI: ffffffff8fd54a10 RBP: 0000000000000004 R08: 0000000000000000 R09: ffffffff8fcfba0f R10: 0000000000000001 R11: 0000000000086089 R12: 0000000000000002 R13: ffff888016a10a20 R14: 0000000000000766 R15: ffff888016a10a40 FS: 0000000000000000(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f6ef312e020 CR3: 000000000b68e000 CR4: 0000000000350ef0 Call Trace: mark_held_locks+0x9f/0xe0 kernel/locking/lockdep.c:4194 __trace_hardirqs_on_caller kernel/locking/lockdep.c:4212 [inline] lockdep_hardirqs_on_prepare kernel/locking/lockdep.c:4280 [inline] lockdep_hardirqs_on_prepare+0x135/0x400 kernel/locking/lockdep.c:4232 trace_hardirqs_on+0x5b/0x1c0 kernel/trace/trace_preemptirq.c:49 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline] _raw_spin_unlock_irqrestore+0x50/0x70 kernel/locking/spinlock.c:194 spin_unlock_irqrestore include/linux/spinlock.h:418 [inline] skb_dequeue+0x125/0x180 net/core/skbuff.c:3206 ieee80211_iface_work+0x224/0xd00 net/mac80211/iface.c:1487 process_one_work+0x9bf/0x16b0 kernel/workqueue.c:2297 worker_thread+0x658/0x11f0 kernel/workqueue.c:2444 kthread+0x3e5/0x4d0 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 ---------------- Code disassembly (best guess): 0: 12 00 adc (%rax),%al 2: 00 48 89 add %cl,-0x77(%rax) 5: ee out %al,(%dx) 6: 48 23 70 50 and 0x50(%rax),%rsi a: 41 ba 01 00 00 00 mov $0x1,%r10d 10: 0f 84 79 01 00 00 je 0x18f 16: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 1d: fc ff df 20: 48 01 c3 add %rax,%rbx 23: 48 c7 03 00 00 00 00 movq $0x0,(%rbx) * 2a: c7 43 08 00 00 00 00 movl $0x0,0x8(%rbx) <-- trapping instruction 31: 48 c7 43 10 00 00 00 movq $0x0,0x10(%rbx) 38: 00 39: 48 rex.W 3a: 8b .byte 0x8b 3b: 84 24 10 test %ah,(%rax,%rdx,1) 3e: 01 00 add %eax,(%rax)