Warning: Permanently added '10.128.1.127' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program syzkaller login: [ 718.237828] INFO: task syz-executor376:8310 blocked for more than 140 seconds. [ 718.245298] Not tainted 4.19.211-syzkaller #0 [ 718.250940] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 718.259316] syz-executor376 D29984 8310 8112 0x00000004 [ 718.264954] Call Trace: [ 718.267592] __schedule+0x887/0x2040 [ 718.271547] ? io_schedule_timeout+0x140/0x140 [ 718.276147] ? lock_downgrade+0x720/0x720 [ 718.280472] ? __mutex_lock+0x418/0x1190 [ 718.284534] schedule+0x8d/0x1b0 [ 718.288057] schedule_preempt_disabled+0xf/0x20 [ 718.292720] __mutex_lock+0x5f0/0x1190 [ 718.296620] ? __se_sys_perf_event_open+0x1863/0x2720 [ 718.301989] ? mutex_trylock+0x1a0/0x1a0 [ 718.306050] ? __se_sys_perf_event_open+0x1806/0x2720 [ 718.311431] ? lock_acquire+0x170/0x3c0 [ 718.315407] ? __se_sys_perf_event_open+0x1687/0x2720 [ 718.320770] ? check_preemption_disabled+0x41/0x280 [ 718.325785] __se_sys_perf_event_open+0x1863/0x2720 [ 718.330972] ? perf_event_set_output+0x4c0/0x4c0 [ 718.335725] ? lock_downgrade+0x720/0x720 [ 718.340042] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 718.345406] ? trace_hardirqs_off_caller+0x6e/0x210 [ 718.350575] ? do_syscall_64+0x21/0x620 [ 718.354547] do_syscall_64+0xf9/0x620 [ 718.358717] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 718.363900] RIP: 0033:0x7f725c923a99 [ 718.367604] Code: Bad RIP value. [ 718.371167] RSP: 002b:00007f725c8b4318 EFLAGS: 00000246 ORIG_RAX: 000000000000012a [ 718.379017] RAX: ffffffffffffffda RBX: 00007f725c9ab3f8 RCX: 00007f725c923a99 [ 718.386280] RDX: 0000000000000000 RSI: 00000000ffffffff RDI: 0000000020000000 [ 718.393689] RBP: 00007f725c9ab3f0 R08: 0000000000000000 R09: 0000000000000000 [ 718.401094] R10: 0000000000000003 R11: 0000000000000246 R12: 00007f725c9ab3fc [ 718.408484] R13: 00007fff59d0486f R14: 00007f725c8b4400 R15: 0000000000022000 [ 718.415773] [ 718.415773] Showing all locks held in the system: [ 718.422268] 1 lock held by khungtaskd/1570: [ 718.426598] #0: 00000000a53a26b4 (rcu_read_lock){....}, at: debug_show_all_locks+0x53/0x265 [ 718.435481] 1 lock held by in:imklog/7821: [ 718.439851] #0: 00000000999b29e5 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x26f/0x310 [ 718.447980] 2 locks held by syz-executor376/8310: [ 718.452822] #0: 00000000186587b9 (&cpuctx_mutex){+.+.}, at: __se_sys_perf_event_open+0x1856/0x2720 [ 718.462212] #1: 00000000186587b9 (&cpuctx_mutex/1){+.+.}, at: __se_sys_perf_event_open+0x1863/0x2720 [ 718.471748] [ 718.473372] ============================================= [ 718.473372] [ 718.480582] NMI backtrace for cpu 0 [ 718.484205] CPU: 0 PID: 1570 Comm: khungtaskd Not tainted 4.19.211-syzkaller #0 [ 718.491888] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 718.501220] Call Trace: [ 718.503805] dump_stack+0x1fc/0x2ef [ 718.507421] nmi_cpu_backtrace.cold+0x63/0xa2 [ 718.511901] ? lapic_can_unplug_cpu+0x80/0x80 [ 718.516378] nmi_trigger_cpumask_backtrace+0x1a6/0x1f0 [ 718.521637] watchdog+0x991/0xe60 [ 718.525072] ? reset_hung_task_detector+0x30/0x30 [ 718.529983] kthread+0x33f/0x460 [ 718.533330] ? kthread_park+0x180/0x180 [ 718.537285] ret_from_fork+0x24/0x30 [ 718.541097] Sending NMI from CPU 0 to CPUs 1: [ 718.546138] NMI backtrace for cpu 1 [ 718.546144] CPU: 1 PID: 4687 Comm: systemd-journal Not tainted 4.19.211-syzkaller #0 [ 718.546150] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 718.546154] RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x50 [ 718.546165] Code: ff 48 89 df e8 11 dd 35 00 e9 ab fe ff ff 4c 89 ef e8 04 dd 35 00 e9 23 fe ff ff 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 <48> 8b 34 24 65 48 8b 04 25 c0 df 01 00 65 8b 15 cc 59 9f 7e 81 e2 [ 718.546169] RSP: 0018:ffff8880a122fa30 EFLAGS: 00000046 [ 718.546177] RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff8167ada7 [ 718.546182] RDX: 0000000000000000 RSI: ffff8880a1220440 RDI: 0000000000000005 [ 718.546186] RBP: ffff8880a13b1300 R08: ffff8880a13b2cf0 R09: 0000000000000000 [ 718.546191] R10: 0000000000000005 R11: 0000000000000000 R12: ffff8880a122fba8 [ 718.546196] R13: 0000000000000000 R14: ffff8880a13b2d30 R15: ffffffff814d4fc0 [ 718.546202] FS: 00007f06022b58c0(0000) GS:ffff8880ba100000(0000) knlGS:0000000000000000 [ 718.546206] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 718.546211] CR2: 00007f05ff685000 CR3: 00000000a1295000 CR4: 00000000003406e0 [ 718.546216] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 718.546221] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 718.546224] Call Trace: [ 718.546227] trace_hardirqs_off+0x50/0x200 [ 718.546230] devkmsg_poll+0xce/0x210 [ 718.546234] ep_item_poll+0x14a/0x3e0 [ 718.546237] ? ep_eventpoll_poll+0x160/0x160 [ 718.546241] ep_send_events_proc+0x1e1/0xb50 [ 718.546245] ? ep_read_events_proc+0x440/0x440 [ 718.546248] ? _raw_spin_unlock_irq+0x24/0x80 [ 718.546252] ? ep_read_events_proc+0x440/0x440 [ 718.546256] ep_scan_ready_list+0x285/0x9a0 [ 718.546259] ? ep_poll_callback+0xc80/0xc80 [ 718.546262] ? ep_poll+0x9c8/0xcb0 [ 718.546266] ? _raw_spin_unlock_irq+0x24/0x80 [ 718.546269] ep_poll+0x36f/0xcb0 [ 718.546273] ? lockdep_hardirqs_on+0x3a8/0x5c0 [ 718.546276] ? ep_send_events_proc+0xb50/0xb50 [ 718.546280] ? debug_object_init_on_stack+0x20/0x20 [ 718.546283] ? kfree+0x110/0x210 [ 718.546287] ? task_work_run+0x11c/0x1c0 [ 718.546291] ? __secure_computing+0x104/0x360 [ 718.546294] ? syscall_trace_enter+0x3b7/0xd60 [ 718.546298] ? syscall_slow_exit_work+0x630/0x630 [ 718.546302] do_epoll_wait+0x1aa/0x200 [ 718.546305] __x64_sys_epoll_wait+0x93/0xf0 [ 718.546308] do_syscall_64+0xf9/0x620 [ 718.546312] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 718.546316] RIP: 0033:0x7f060157e2e3 [ 718.546326] Code: 00 f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 83 3d 29 54 2b 00 00 75 13 49 89 ca b8 e8 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 34 c3 48 83 ec 08 e8 0b c2 00 00 48 89 04 24 [ 718.546330] RSP: 002b:00007ffe14e97578 EFLAGS: 00000246 ORIG_RAX: 00000000000000e8 [ 718.546339] RAX: ffffffffffffffda RBX: 0000561400e901e0 RCX: 00007f060157e2e3 [ 718.546344] RDX: 0000000000000013 RSI: 00007ffe14e97580 RDI: 0000000000000008 [ 718.546349] RBP: 00007ffe14e97770 R08: 00007ffe14f62000 R09: 000000b919d0e1c4 [ 718.546354] R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffe14e97580 [ 718.546359] R13: 0000000000000001 R14: 0000000000000000 R15: 0005e0496f9104e2 [ 718.547240] Kernel panic - not syncing: hung_task: blocked tasks [ 718.850925] CPU: 0 PID: 1570 Comm: khungtaskd Not tainted 4.19.211-syzkaller #0 [ 718.858353] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 718.867682] Call Trace: [ 718.870284] dump_stack+0x1fc/0x2ef [ 718.873898] panic+0x26a/0x50e [ 718.877073] ? __warn_printk+0xf3/0xf3 [ 718.880944] ? lapic_can_unplug_cpu+0x80/0x80 [ 718.885435] ? ___preempt_schedule+0x16/0x18 [ 718.889830] ? watchdog+0x991/0xe60 [ 718.893446] ? nmi_trigger_cpumask_backtrace+0x15e/0x1f0 [ 718.898883] watchdog+0x9a2/0xe60 [ 718.902322] ? reset_hung_task_detector+0x30/0x30 [ 718.907150] kthread+0x33f/0x460 [ 718.910505] ? kthread_park+0x180/0x180 [ 718.914460] ret_from_fork+0x24/0x30 [ 718.918418] Kernel Offset: disabled [ 718.922033] Rebooting in 86400 seconds..