INFO: task syz-executor.4:8718 blocked for more than 140 seconds. Not tainted 4.19.211-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.4 D28256 8718 8114 0x00000004 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x887/0x2040 kernel/sched/core.c:3517 schedule+0x8d/0x1b0 kernel/sched/core.c:3561 schedule_timeout+0x92d/0xfe0 kernel/time/timer.c:1794 do_wait_for_common kernel/sched/completion.c:83 [inline] __wait_for_common kernel/sched/completion.c:104 [inline] wait_for_common+0x29c/0x470 kernel/sched/completion.c:115 usb_start_wait_urb+0x14b/0x4c0 drivers/usb/core/message.c:62 usb_bulk_msg+0x226/0x550 drivers/usb/core/message.c:253 proc_bulk+0x3de/0x860 drivers/usb/core/devio.c:1211 usbdev_do_ioctl+0x696/0x3030 drivers/usb/core/devio.c:2435 usbdev_ioctl+0x21/0x30 drivers/usb/core/devio.c:2585 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:501 [inline] do_vfs_ioctl+0xcdb/0x12e0 fs/ioctl.c:688 ksys_ioctl+0x9b/0xc0 fs/ioctl.c:705 __do_sys_ioctl fs/ioctl.c:712 [inline] __se_sys_ioctl fs/ioctl.c:710 [inline] __x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:710 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7fdcf0e5b279 Code: Bad RIP value. RSP: 002b:00007fdcef7d0168 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007fdcf0f6df80 RCX: 00007fdcf0e5b279 RDX: 0000000020000000 RSI: 00000000c0185502 RDI: 0000000000000003 RBP: 00007fdcf0eb5189 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffc5e40cfbf R14: 00007fdcef7d0300 R15: 0000000000022000 Showing all locks held in the system: 1 lock held by khungtaskd/1570: #0: 000000006e9a619d (rcu_read_lock){....}, at: debug_show_all_locks+0x53/0x265 kernel/locking/lockdep.c:4441 3 locks held by systemd-udevd/4699: 1 lock held by in:imklog/7807: #0: 00000000ee55b8d0 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x26f/0x310 fs/file.c:767 2 locks held by kworker/u4:4/12057: 2 locks held by kworker/0:3/9059: #0: 00000000e8b301d1 ((wq_completion)"rcu_gp"){+.+.}, at: process_one_work+0x767/0x1570 kernel/workqueue.c:2124 #1: 00000000c3bf512b ((work_completion)(&rew.rew_work)){+.+.}, at: process_one_work+0x79c/0x1570 kernel/workqueue.c:2128 5 locks held by kworker/u4:10/14901: #0: 00000000a5120dba ((wq_completion)"%s""netns"){+.+.}, at: process_one_work+0x767/0x1570 kernel/workqueue.c:2124 #1: 000000009311fd92 (net_cleanup_work){+.+.}, at: process_one_work+0x79c/0x1570 kernel/workqueue.c:2128 #2: 000000000bc94a4d (pernet_ops_rwsem){++++}, at: cleanup_net+0xa8/0x8b0 net/core/net_namespace.c:521 #3: 0000000050ae2f9b (rtnl_mutex){+.+.}, at: ip_tunnel_delete_nets+0x8e/0x580 net/ipv4/ip_tunnel.c:1083 #4: 000000000c376c59 (rcu_preempt_state.exp_mutex){+.+.}, at: exp_funnel_lock kernel/rcu/tree_exp.h:297 [inline] #4: 000000000c376c59 (rcu_preempt_state.exp_mutex){+.+.}, at: _synchronize_rcu_expedited+0x4dc/0x6f0 kernel/rcu/tree_exp.h:667 1 lock held by syz-executor.5/18343: 1 lock held by syz-executor.3/18371: 3 locks held by syz-executor.4/18375: attempt to access beyond end of device 2 locks held by syz-executor.1/18376: loop3: rw=2049, want=16, limit=15 Buffer I/O error on dev loop3, logical block 15, lost async page write ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1570 Comm: khungtaskd Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1fc/0x2ef lib/dump_stack.c:118 nmi_cpu_backtrace.cold+0x63/0xa2 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1a6/0x1f0 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:203 [inline] watchdog+0x991/0xe60 kernel/hung_task.c:287 kthread+0x33f/0x460 kernel/kthread.c:259 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 18368 Comm: syz-executor.3 Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022 RIP: 0033:0x7f7f8ee00111 Code: 49 89 0e 49 89 7e 08 49 8b 50 f8 48 89 ee 4c 89 e3 4c 89 c0 0f 1f 44 00 00 49 89 dd 48 39 cf 72 2f 48 83 e8 08 48 39 d1 73 14 <0f> 1f 80 00 00 00 00 48 8b 50 f8 48 83 e8 08 48 39 ca 77 f3 48 39 RSP: 002b:00007ffe4b4cb140 EFLAGS: 00000293 RAX: 00007f7f8ec6b818 RBX: 00007f7f8ec6ade8 RCX: ffffffff81b0d803 RDX: ffffffff81b0e1da RSI: 00007f7f8ec6adf0 RDI: ffffffff81b0e7be RBP: 00007f7f8ec62280 R08: 00007f7f8ec6ef38 R09: 00000000c3b7ffd7 R10: 0000000000000000 R11: 0000000000000000 R12: 00007f7f8ec62278 R13: 00007f7f8ec6ade8 R14: 00007f7f8ec62270 R15: 0000000000000018 FS: 000055555690b400 GS: 0000000000000000