INFO: task syz-executor.4:22211 blocked for more than 140 seconds. Not tainted 4.14.277-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.4 D28880 22211 7966 0x00000004 Call Trace: context_switch kernel/sched/core.c:2811 [inline] __schedule+0x88b/0x1de0 kernel/sched/core.c:3387 schedule+0x8d/0x1b0 kernel/sched/core.c:3431 schedule_timeout+0x80a/0xe90 kernel/time/timer.c:1724 do_wait_for_common kernel/sched/completion.c:91 [inline] __wait_for_common kernel/sched/completion.c:112 [inline] wait_for_common+0x272/0x430 kernel/sched/completion.c:123 usb_start_wait_urb+0x125/0x440 drivers/usb/core/message.c:61 usb_bulk_msg+0x1f6/0x500 drivers/usb/core/message.c:252 proc_bulk+0x331/0x6d0 drivers/usb/core/devio.c:1223 usbdev_do_ioctl+0x5b0/0x2b70 drivers/usb/core/devio.c:2449 usbdev_ioctl+0x21/0x30 drivers/usb/core/devio.c:2599 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:500 [inline] do_vfs_ioctl+0x75a/0xff0 fs/ioctl.c:684 SYSC_ioctl fs/ioctl.c:701 [inline] SyS_ioctl+0x7f/0xb0 fs/ioctl.c:692 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x7f1c829090e9 RSP: 002b:00007f1c8127e168 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f1c82a1bf60 RCX: 00007f1c829090e9 RDX: 0000000020000180 RSI: 00000000c0185502 RDI: 0000000000000003 RBP: 00007f1c8296308d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffdfd800e0f R14: 00007f1c8127e300 R15: 0000000000022000 Showing all locks held in the system: 1 lock held by khungtaskd/1531: #0: (tasklist_lock){.+.+}, at: [] debug_show_all_locks+0x7c/0x21a kernel/locking/lockdep.c:4548 1 lock held by in:imklog/7641: #0: (&f->f_pos_lock){+.+.}, at: [] __fdget_pos+0x1fb/0x2b0 fs/file.c:819 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1531 Comm: khungtaskd Not tainted 4.14.277-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/12/2022 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x1b2/0x281 lib/dump_stack.c:58 nmi_cpu_backtrace.cold+0x57/0x93 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x13a/0x180 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:140 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:195 [inline] watchdog+0x5b9/0xb40 kernel/hung_task.c:274 kthread+0x30d/0x420 kernel/kthread.c:232 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 22 Comm: kworker/u4:1 Not tainted 4.14.277-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/12/2022 Workqueue: bat_events batadv_nc_worker task: ffff8880b55e25c0 task.stack: ffff8880b55f0000 RIP: 0010:rcu_read_unlock include/linux/rcupdate.h:684 [inline] RIP: 0010:batadv_nc_purge_orig_hash net/batman-adv/network-coding.c:422 [inline] RIP: 0010:batadv_nc_worker+0x580/0xc50 net/batman-adv/network-coding.c:728 RSP: 0018:ffff8880b55f7cd8 EFLAGS: 00000202 RAX: 0000000000000001 RBX: ffff888076406198 RCX: 1ffffffff11993ac RDX: 0000000000000000 RSI: ffffffff87ccff80 RDI: ffff8880ba42ca8c RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000020012 R10: ffff8880b55e2e98 R11: ffff8880b55e25c0 R12: dffffc0000000000 R13: ffff8880b552a100 R14: ffff88813fe468c0 R15: ffff8880a49f8000 FS: 0000000000000000(0000) GS:ffff8880ba400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000c0003bf200 CR3: 00000000b3f67000 CR4: 00000000003406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: process_one_work+0x793/0x14a0 kernel/workqueue.c:2117 worker_thread+0x5cc/0xff0 kernel/workqueue.c:2251 kthread+0x30d/0x420 kernel/kthread.c:232 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404 Code: ed 88 01 00 00 0f 85 26 fc ff ff e8 bb 96 69 fa e8 b6 71 5a fa 85 c0 74 12 e8 ad 96 69 fa 80 3d d8 d1 07 03 00 0f 84 b3 02 00 00 9b 96 69 fa e8 56 6b 5a fa e8 91 96 69 fa 48 c7 c2 00 b0 eb ---------------- Code disassembly (best guess): 0: ed in (%dx),%eax 1: 88 01 mov %al,(%rcx) 3: 00 00 add %al,(%rax) 5: 0f 85 26 fc ff ff jne 0xfffffc31 b: e8 bb 96 69 fa callq 0xfa6996cb 10: e8 b6 71 5a fa callq 0xfa5a71cb 15: 85 c0 test %eax,%eax 17: 74 12 je 0x2b 19: e8 ad 96 69 fa callq 0xfa6996cb 1e: 80 3d d8 d1 07 03 00 cmpb $0x0,0x307d1d8(%rip) # 0x307d1fd 25: 0f 84 b3 02 00 00 je 0x2de * 2b: e8 9b 96 69 fa callq 0xfa6996cb <-- trapping instruction 30: e8 56 6b 5a fa callq 0xfa5a6b8b 35: e8 91 96 69 fa callq 0xfa6996cb 3a: 48 rex.W 3b: c7 .byte 0xc7 3c: c2 00 b0 retq $0xb000 3f: eb .byte 0xeb