[ OK ] Started Serial Getty on ttyS0. [ OK ] Reached target Login Prompts. [ OK ] Reached target Multi-User System. [ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.228' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 497.752227] hrtimer: interrupt took 37012 ns [ 717.709163] INFO: task syz-executor962:8110 blocked for more than 140 seconds. [ 717.716672] Not tainted 4.19.211-syzkaller #0 [ 717.723115] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 717.731706] syz-executor962 D28536 8110 8109 0x00000004 [ 717.737348] Call Trace: [ 717.740955] __schedule+0x887/0x2040 [ 717.744689] ? io_schedule_timeout+0x140/0x140 [ 717.750208] ? mark_held_locks+0xa6/0xf0 [ 717.754275] ? rwsem_down_read_failed+0x20a/0x390 [ 717.760079] schedule+0x8d/0x1b0 [ 717.763453] rwsem_down_read_failed+0x20a/0x390 [ 717.768120] ? rt_mutex_futex_unlock+0xf0/0xf0 [ 717.774038] call_rwsem_down_read_failed+0x14/0x30 [ 717.780739] down_read+0x44/0x80 [ 717.784120] ? __do_page_fault+0x97f/0xd60 [ 717.788356] __do_page_fault+0x97f/0xd60 [ 717.793697] ? page_fault+0x8/0x30 [ 717.797255] ? trace_hardirqs_off_caller+0x6e/0x210 [ 717.803160] ? spurious_fault+0x840/0x840 [ 717.807316] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 717.813099] ? page_fault+0x8/0x30 [ 717.816647] page_fault+0x1e/0x30 [ 717.821011] RIP: 0033:0x7f9ed6c2ad30 [ 717.824728] Code: Bad RIP value. [ 717.828089] RSP: 002b:00007ffca7b2dc68 EFLAGS: 00010246 [ 717.834803] RAX: 0000000000000000 RBX: 0000000000000064 RCX: 0000000000000000 [ 717.842624] RDX: 00007ffca7b2dc80 RSI: 0000000000000000 RDI: 0000000000000000 [ 717.850460] RBP: 0000000000000032 R08: 00007ffca7bd3000 R09: 0000008062bbd76d [ 717.857729] R10: 001a140d3c870080 R11: 0000000000000001 R12: 00007f9ed6c7141c [ 717.865916] R13: 00007ffca7b2dcd0 R14: 00007ffca7b2dcf0 R15: 0000000000000001 [ 717.873796] INFO: task syz-executor962:8111 blocked for more than 140 seconds. [ 717.881727] Not tainted 4.19.211-syzkaller #0 [ 717.886736] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 717.895599] syz-executor962 D27416 8111 8109 0x80000004 [ 717.902241] Call Trace: [ 717.904864] __schedule+0x887/0x2040 [ 717.908585] ? io_schedule_timeout+0x140/0x140 [ 717.914653] ? mark_held_locks+0xa6/0xf0 [ 717.918816] ? rwsem_down_read_failed+0x20a/0x390 [ 717.924602] schedule+0x8d/0x1b0 [ 717.927977] rwsem_down_read_failed+0x20a/0x390 [ 717.933636] ? rt_mutex_futex_unlock+0xf0/0xf0 [ 717.938229] ? rcu_nmi_exit+0xb3/0x180 [ 717.943036] ? retint_kernel+0x2d/0x2d [ 717.946947] call_rwsem_down_read_failed+0x14/0x30 [ 717.952823] down_read+0x44/0x80 [ 717.956200] ? do_exit+0x6e4/0x2be0 [ 717.960712] do_exit+0x6e4/0x2be0 [ 717.964178] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 717.968944] ? lockdep_hardirqs_on+0x3a8/0x5c0 [ 717.976172] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 717.981540] ? mm_update_next_owner+0x650/0x650 [ 717.986221] ? rcu_nmi_exit+0xb3/0x180 [ 717.990998] ? retint_kernel+0x2d/0x2d [ 717.994910] do_group_exit+0x125/0x310 [ 717.998815] get_signal+0x3f2/0x1f70 [ 718.003768] ? vm_mmap_pgoff+0x152/0x200 [ 718.007847] do_signal+0x8f/0x1670 [ 718.012299] ? setup_sigcontext+0x820/0x820 [ 718.016625] ? down_write_killable+0x9a/0xb0 [ 718.021962] ? vm_mmap_pgoff+0xe8/0x200 [ 718.025944] ? vma_is_stack_for_current+0xc0/0xc0 [ 718.031727] ? do_dup2+0x450/0x450 [ 718.035279] ? ksys_mmap_pgoff+0x12e/0x5a0 [ 718.040408] ? fput+0x2b/0x190 [ 718.043603] ? ksys_mmap_pgoff+0x2ad/0x5a0 [ 718.047838] ? exit_to_usermode_loop+0x36/0x2a0 [ 718.053773] exit_to_usermode_loop+0x204/0x2a0 [ 718.058362] do_syscall_64+0x538/0x620 [ 718.063123] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 718.068315] RIP: 0033:0x7f9ed6be9b89 [ 718.072965] Code: Bad RIP value. [ 718.076330] RSP: 002b:00007f9ed6b9b2f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000009 [ 718.085011] RAX: fffffffffffffffc RBX: 0000000000000009 RCX: 00007f9ed6be9b89 [ 718.092837] RDX: 0000000000000000 RSI: 0000000000002000 RDI: 0000000020341000 [ 718.100619] RBP: 00007f9ed6c71408 R08: 0000000000000004 R09: 0000000000000000 [ 718.107891] R10: 0000000000000011 R11: 0000000000000246 R12: 00007f9ed6c71400 [ 718.116513] R13: 00007f9ed6c3f074 R14: 0000000000000000 R15: 0000000000022000 [ 718.124423] [ 718.124423] Showing all locks held in the system: [ 718.131331] 1 lock held by khungtaskd/1569: [ 718.135644] #0: 00000000f54e9854 (rcu_read_lock){....}, at: debug_show_all_locks+0x53/0x265 [ 718.145244] 1 lock held by in:imklog/7794: [ 718.150613] #0: 00000000479760d1 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x26f/0x310 [ 718.158609] 1 lock held by syz-executor962/8110: [ 718.164276] #0: 000000004833c0f3 (&mm->mmap_sem){++++}, at: __do_page_fault+0x97f/0xd60 [ 718.173052] 1 lock held by syz-executor962/8111: [ 718.177798] #0: 000000004833c0f3 (&mm->mmap_sem){++++}, at: do_exit+0x6e4/0x2be0 [ 718.187779] 1 lock held by syz-executor962/8112: [ 718.193079] [ 718.194702] ============================================= [ 718.194702] [ 718.202639] NMI backtrace for cpu 0 [ 718.206268] CPU: 0 PID: 1569 Comm: khungtaskd Not tainted 4.19.211-syzkaller #0 [ 718.213707] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 718.223048] Call Trace: [ 718.225633] dump_stack+0x1fc/0x2ef [ 718.229265] nmi_cpu_backtrace.cold+0x63/0xa2 [ 718.233761] ? lapic_can_unplug_cpu+0x80/0x80 [ 718.238250] nmi_trigger_cpumask_backtrace+0x1a6/0x1f0 [ 718.243526] watchdog+0x991/0xe60 [ 718.246978] ? reset_hung_task_detector+0x30/0x30 [ 718.251814] kthread+0x33f/0x460 [ 718.255172] ? kthread_park+0x180/0x180 [ 718.259151] ret_from_fork+0x24/0x30 [ 718.262954] Sending NMI from CPU 0 to CPUs 1: [ 718.268044] NMI backtrace for cpu 1 [ 718.268051] CPU: 1 PID: 8112 Comm: syz-executor962 Not tainted 4.19.211-syzkaller #0 [ 718.268057] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 718.268060] RIP: 0010:__lock_acquire+0x7f0/0x3ff0 [ 718.268071] Code: 14 92 48 8d 6c d6 d8 48 ba 00 00 00 00 00 fc ff df 48 8d 7d 21 48 89 f9 48 c1 e9 03 0f b6 14 11 48 89 f9 83 e1 07 38 ca 7f 08 <84> d2 0f 85 c9 26 00 00 49 8d 7a 21 0f b6 6d 21 48 ba 00 00 00 00 [ 718.268076] RSP: 0018:ffff8880b0caf770 EFLAGS: 00000097 [ 718.268083] RAX: 00000000000005d0 RBX: 3f15d94582dca06a RCX: 0000000000000001 [ 718.268088] RDX: 0000000000000000 RSI: ffff8880b01a2888 RDI: ffff8880b01a28a9 [ 718.268093] RBP: ffff8880b01a2888 R08: 00000000000005d0 R09: 0000000000000001 [ 718.268098] R10: ffff8880b01a28b0 R11: 0000000000000000 R12: 00000000000405d0 [ 718.268103] R13: ffff8880b01a2000 R14: ffff8880b01a28c8 R15: 0000000000000000 [ 718.268108] FS: 00007f9ed6b7a700(0000) GS:ffff8880ba100000(0000) knlGS:0000000000000000 [ 718.268113] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 718.268118] CR2: 0000555555c192b8 CR3: 00000000ab842000 CR4: 00000000003406e0 [ 718.268123] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 718.268128] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 718.268130] Call Trace: [ 718.268134] ? __schedule+0x88f/0x2040 [ 718.268137] ? switch_mm_irqs_off+0x764/0x1340 [ 718.268141] ? mark_held_locks+0xa6/0xf0 [ 718.268144] ? mark_held_locks+0xf0/0xf0 [ 718.268147] ? mark_held_locks+0xa6/0xf0 [ 718.268151] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 718.268155] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 718.268159] ? lockdep_hardirqs_on+0x3a8/0x5c0 [ 718.268162] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 718.268166] ? rcu_nmi_exit+0xb3/0x180 [ 718.268169] lock_acquire+0x170/0x3c0 [ 718.268172] ? perf_mmap+0x693/0x1810 [ 718.268176] ? perf_mmap+0x693/0x1810 [ 718.268179] __mutex_lock+0xd7/0x1190 [ 718.268182] ? perf_mmap+0x693/0x1810 [ 718.268186] ? perf_mmap+0x693/0x1810 [ 718.268189] ? mutex_trylock+0x1a0/0x1a0 [ 718.268193] ? __mutex_unlock_slowpath+0xea/0x610 [ 718.268197] ? wait_for_completion_io+0x10/0x10 [ 718.268200] ? check_memory_region+0xcb/0x170 [ 718.268204] perf_mmap+0x693/0x1810 [ 718.268207] ? perf_release+0x40/0x40 [ 718.268211] ? rcu_read_lock_sched_held+0x16c/0x1d0 [ 718.268214] mmap_region+0xc94/0x16b0 [ 718.268218] ? vm_munmap+0x140/0x140 [ 718.268221] ? get_unmapped_area+0x294/0x3c0 [ 718.268224] do_mmap+0x8e8/0x1080 [ 718.268228] vm_mmap_pgoff+0x197/0x200 [ 718.268232] ? vma_is_stack_for_current+0xc0/0xc0 [ 718.268235] ? do_dup2+0x450/0x450 [ 718.268238] ksys_mmap_pgoff+0x298/0x5a0 [ 718.268242] ? find_mergeable_anon_vma+0x260/0x260 [ 718.268246] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 718.268250] ? trace_hardirqs_off_caller+0x6e/0x210 [ 718.268253] ? do_syscall_64+0x21/0x620 [ 718.268257] do_syscall_64+0xf9/0x620 [ 718.268261] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 718.268264] RIP: 0033:0x7f9ed6be9b89 [ 718.268274] Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 11 15 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 [ 718.268278] RSP: 002b:00007f9ed6b7a2f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000009 [ 718.268287] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f9ed6be9b89 [ 718.268292] RDX: 0000000000000000 RSI: 0000000000002000 RDI: 0000000020395000 [ 718.268297] RBP: 00007f9ed6c71418 R08: 0000000000000003 R09: 0000000000000000 [ 718.268302] R10: 0000000000000011 R11: 0000000000000246 R12: 00007f9ed6c71410 [ 718.268307] R13: 00007f9ed6c3f074 R14: 00007f9ed6c6f130 R15: 0000000000022000 [ 718.296287] Kernel panic - not syncing: hung_task: blocked tasks [ 718.625233] CPU: 0 PID: 1569 Comm: khungtaskd Not tainted 4.19.211-syzkaller #0 [ 718.632669] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 718.642012] Call Trace: [ 718.644597] dump_stack+0x1fc/0x2ef [ 718.648223] panic+0x26a/0x50e [ 718.651410] ? __warn_printk+0xf3/0xf3 [ 718.655297] ? lapic_can_unplug_cpu+0x80/0x80 [ 718.659787] ? ___preempt_schedule+0x16/0x18 [ 718.664191] ? watchdog+0x991/0xe60 [ 718.667812] ? nmi_trigger_cpumask_backtrace+0x15e/0x1f0 [ 718.673262] watchdog+0x9a2/0xe60 [ 718.676717] ? reset_hung_task_detector+0x30/0x30 [ 718.681641] kthread+0x33f/0x460 [ 718.685002] ? kthread_park+0x180/0x180 [ 718.688972] ret_from_fork+0x24/0x30 [ 718.693497] Kernel Offset: disabled [ 718.697113] Rebooting in 86400 seconds..