INFO: task syz-executor.0:27658 blocked for more than 143 seconds. Not tainted 5.9.0-rc4-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.0 state:D stack:28344 pid:27658 ppid: 6869 flags:0x20024004 Call Trace: context_switch kernel/sched/core.c:3778 [inline] __schedule+0xea9/0x2230 kernel/sched/core.c:4527 schedule+0xd0/0x2a0 kernel/sched/core.c:4602 schedule_timeout+0x1d8/0x250 kernel/time/timer.c:1855 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+0x15e/0x270 kernel/sched/completion.c:157 usb_start_wait_urb+0x144/0x2b0 drivers/usb/core/message.c:63 usb_bulk_msg+0x226/0x550 drivers/usb/core/message.c:254 do_proc_bulk+0x39b/0x710 drivers/usb/core/devio.c:1231 proc_bulk drivers/usb/core/devio.c:1268 [inline] usbdev_do_ioctl drivers/usb/core/devio.c:2542 [inline] usbdev_ioctl+0x586/0x3360 drivers/usb/core/devio.c:2708 compat_ptr_ioctl+0x67/0x90 fs/ioctl.c:789 __do_compat_sys_ioctl+0x1d3/0x230 fs/ioctl.c:842 do_syscall_32_irqs_on arch/x86/entry/common.c:78 [inline] __do_fast_syscall_32+0x60/0x90 arch/x86/entry/common.c:137 do_fast_syscall_32+0x2f/0x70 arch/x86/entry/common.c:160 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c RIP: 0023:0xf7f6d549 Code: Bad RIP value. RSP: 002b:00000000f55670cc EFLAGS: 00000296 ORIG_RAX: 0000000000000036 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00000000c0185502 RDX: 00000000200005c0 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 Showing all locks held in the system: 1 lock held by khungtaskd/1170: #0: ffffffff89bd6a40 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:5829 2 locks held by in:imklog/6664: 2 locks held by agetty/6763: #0: ffff88809691a098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:267 #1: ffffc90000fe42e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x223/0x1a30 drivers/tty/n_tty.c:2156 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1170 Comm: khungtaskd Not tainted 5.9.0-rc4-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x198/0x1fd lib/dump_stack.c:118 nmi_cpu_backtrace.cold+0x70/0xb1 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1b3/0x223 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:209 [inline] watchdog+0xd7d/0x1000 kernel/hung_task.c:295 kthread+0x3b5/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 57 Comm: kworker/u4:2 Not tainted 5.9.0-rc4-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: bat_events batadv_purge_orig RIP: 0010:rcu_lockdep_current_cpu_online kernel/rcu/tree.c:1163 [inline] RIP: 0010:rcu_lockdep_current_cpu_online+0xcf/0x110 kernel/rcu/tree.c:1150 Code: 5b 20 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 75 41 48 8b 45 70 48 85 c3 0f 95 c0 65 ff 0d 81 da a0 7e <74> 07 48 83 c4 08 5b 5d c3 e8 52 52 9f ff eb f2 48 89 04 24 e8 68 RSP: 0018:ffffc90000f37ae0 EFLAGS: 00000282 RAX: 0000000000000001 RBX: 0000000000000001 RCX: 1ffffffff1308b20 RDX: 1ffffffff137b35e RSI: 0000000000000203 RDI: ffffffff89bd9af0 RBP: ffffffff89bd9a80 R08: 0000000000000000 R09: ffffffff8ab26b8f R10: fffffbfff1564d71 R11: 0000000000000000 R12: 0000000000000001 R13: ffff8880522c4f58 R14: ffffffff87d9c270 R15: 000000000000013d FS: 0000000000000000(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f287093e000 CR3: 0000000092ce5000 CR4: 00000000001526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: rcu_read_lock_held_common kernel/rcu/update.c:123 [inline] rcu_read_lock_held_common kernel/rcu/update.c:113 [inline] rcu_read_lock_sched_held+0x25/0xb0 kernel/rcu/update.c:134 trace_lock_release include/trace/events/lock.h:58 [inline] lock_release+0x6a1/0x8f0 kernel/locking/lockdep.c:5017 __raw_spin_unlock_bh include/linux/spinlock_api_smp.h:174 [inline] _raw_spin_unlock_bh+0x12/0x30 kernel/locking/spinlock.c:207 spin_unlock_bh include/linux/spinlock.h:399 [inline] batadv_purge_orig_ref+0xee0/0x1540 net/batman-adv/originator.c:1366 batadv_purge_orig+0x17/0x60 net/batman-adv/originator.c:1379 process_one_work+0x94c/0x1670 kernel/workqueue.c:2269 worker_thread+0x64c/0x1120 kernel/workqueue.c:2415 kthread+0x3b5/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294