[ OK ] Found device /dev/ttyS0. [ OK ] Started Getty on tty2. [ OK ] Started Serial Getty on ttyS0. [ OK ] Started Getty on tty1. [ OK ] Started getty on tty2-tty6 if dbus and logind are not available. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.185' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program executing program syzkaller login: [ 485.359991][ T28] audit: type=1400 audit(1597051386.928:8): avc: denied { execmem } for pid=6846 comm="syz-executor672" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=process permissive=1 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 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 [ 637.466940][ T1161] INFO: task syz-executor672:7284 blocked for more than 143 seconds. [ 637.475091][ T1161] Not tainted 5.8.0-syzkaller #0 [ 637.480625][ T1161] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 637.489846][ T1161] syz-executor672 D28360 7284 6846 0x80004000 [ 637.496217][ T1161] Call Trace: [ 637.499718][ T1161] __schedule+0x8e5/0x21e0 [ 637.504147][ T1161] ? io_schedule_timeout+0x140/0x140 [ 637.509672][ T1161] ? io_wq_cancel_all+0x5a0/0x5a0 [ 637.514700][ T1161] ? _raw_spin_unlock_irq+0x1f/0x80 [ 637.520004][ T1161] schedule+0xd0/0x2a0 [ 637.524124][ T1161] io_uring_flush+0x740/0xa90 [ 637.528843][ T1161] ? io_req_task_cancel+0x20/0x20 [ 637.533952][ T1161] ? add_wait_queue_exclusive+0x180/0x180 [ 637.539772][ T1161] ? find_held_lock+0x2d/0x110 [ 637.544532][ T1161] ? lock_is_held_type+0xbb/0xf0 [ 637.549954][ T1161] ? io_req_task_cancel+0x20/0x20 [ 637.555034][ T1161] filp_close+0xb4/0x170 [ 637.559344][ T1161] put_files_struct+0x1cc/0x350 [ 637.564195][ T1161] exit_files+0x7e/0xa0 [ 637.568474][ T1161] do_exit+0xb43/0x29f0 [ 637.572640][ T1161] ? _down_write_nest_lock+0x150/0x150 [ 637.578342][ T1161] ? mm_update_next_owner+0x7a0/0x7a0 [ 637.583715][ T1161] ? lock_is_held_type+0xbb/0xf0 [ 637.588751][ T1161] do_group_exit+0x125/0x310 [ 637.593347][ T1161] __x64_sys_exit_group+0x3a/0x50 [ 637.598461][ T1161] do_syscall_64+0x2d/0x70 [ 637.602879][ T1161] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 637.608805][ T1161] RIP: 0033:0x440938 [ 637.612689][ T1161] Code: Bad RIP value. [ 637.617566][ T1161] RSP: 002b:00007ffc0e913ed8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 637.625968][ T1161] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000440938 [ 637.633981][ T1161] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 637.642022][ T1161] RBP: 00000000004c01d0 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 637.650024][ T1161] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 [ 637.658057][ T1161] R13: 00000000006d21a0 R14: 0000000000000000 R15: 0000000000000000 [ 637.666080][ T1161] [ 637.666080][ T1161] Showing all locks held in the system: [ 637.673890][ T1161] 1 lock held by khungtaskd/1161: [ 637.678986][ T1161] #0: ffffffff89bd62c0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 [ 637.688920][ T1161] 1 lock held by in:imklog/6515: [ 637.693849][ T1161] #0: ffff8880a5ca6930 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 [ 637.703026][ T1161] [ 637.705347][ T1161] ============================================= [ 637.705347][ T1161] [ 637.713781][ T1161] NMI backtrace for cpu 0 [ 637.718190][ T1161] CPU: 0 PID: 1161 Comm: khungtaskd Not tainted 5.8.0-syzkaller #0 [ 637.726057][ T1161] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 637.736086][ T1161] Call Trace: [ 637.739467][ T1161] dump_stack+0x18f/0x20d [ 637.743776][ T1161] nmi_cpu_backtrace.cold+0x70/0xb1 [ 637.748993][ T1161] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 637.754618][ T1161] nmi_trigger_cpumask_backtrace+0x1b3/0x223 [ 637.760621][ T1161] watchdog+0xd7d/0x1000 [ 637.764857][ T1161] ? reset_hung_task_detector+0x30/0x30 [ 637.770409][ T1161] kthread+0x3b5/0x4a0 [ 637.774469][ T1161] ? __kthread_bind_mask+0xc0/0xc0 [ 637.779554][ T1161] ? __kthread_bind_mask+0xc0/0xc0 [ 637.784670][ T1161] ret_from_fork+0x1f/0x30 [ 637.789244][ T1161] Sending NMI from CPU 0 to CPUs 1: [ 637.794991][ C1] NMI backtrace for cpu 1 [ 637.794996][ C1] CPU: 1 PID: 3889 Comm: systemd-journal Not tainted 5.8.0-syzkaller #0 [ 637.795001][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 637.795005][ C1] RIP: 0010:memset_erms+0x9/0x10 [ 637.795014][ C1] Code: c1 e9 03 40 0f b6 f6 48 b8 01 01 01 01 01 01 01 01 48 0f af c6 f3 48 ab 89 d1 f3 aa 4c 89 c8 c3 90 49 89 f9 40 88 f0 48 89 d1 aa 4c 89 c8 c3 90 49 89 fa 40 0f b6 ce 48 b8 01 01 01 01 01 01 [ 637.795017][ C1] RSP: 0018:ffffc90005277d08 EFLAGS: 00010246 [ 637.795024][ C1] RAX: 00000000000c1e00 RBX: 0000000000000cc0 RCX: 00000000000006c0 [ 637.795029][ C1] RDX: 0000000000001000 RSI: 0000000000000000 RDI: ffff88809de8b540 [ 637.795033][ C1] RBP: ffff8880aa240900 R08: ffff88809de8ac00 R09: ffff88809de8ac00 [ 637.795037][ C1] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000286 [ 637.795041][ C1] R13: 0000000000000cc0 R14: ffff8880aa240900 R15: ffff88809de8ac00 [ 637.795046][ C1] FS: 00007fa07185e8c0(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000 [ 637.795050][ C1] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 637.795055][ C1] CR2: 00007fa06ec13000 CR3: 00000000927ab000 CR4: 00000000001506e0 [ 637.795060][ C1] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 637.795064][ C1] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 637.795066][ C1] Call Trace: [ 637.795069][ C1] kmem_cache_alloc+0x2e0/0x3a0 [ 637.795072][ C1] getname_flags.part.0+0x50/0x4f0 [ 637.795075][ C1] ? __sanitizer_cov_trace_switch+0x45/0x70 [ 637.795078][ C1] getname+0x8e/0xd0 [ 637.795081][ C1] do_sys_openat2+0xf5/0x420 [ 637.795084][ C1] ? seccomp_notify_ioctl+0xd90/0xd90 [ 637.795087][ C1] ? strncpy_from_user+0x2bf/0x3e0 [ 637.795090][ C1] ? build_open_flags+0x650/0x650 [ 637.795093][ C1] ? getname_flags.part.0+0x1dd/0x4f0 [ 637.795096][ C1] __x64_sys_open+0x119/0x1c0 [ 637.795099][ C1] ? do_sys_open+0x140/0x140 [ 637.795102][ C1] ? __secure_computing+0x104/0x360 [ 637.795105][ C1] do_syscall_64+0x2d/0x70 [ 637.795109][ C1] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 637.795111][ C1] RIP: 0033:0x7fa070dee840 [ 637.795121][ C1] Code: 73 01 c3 48 8b 0d 68 77 20 00 f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 83 3d 89 bb 20 00 00 75 10 b8 02 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 31 c3 48 83 ec 08 e8 1e f6 ff ff 48 89 04 24 [ 637.795125][ C1] RSP: 002b:00007ffe015fba28 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 [ 637.795133][ C1] RAX: ffffffffffffffda RBX: 00007ffe015fbd30 RCX: 00007fa070dee840 [ 637.795137][ C1] RDX: 00000000000001a0 RSI: 0000000000080042 RDI: 00005605a9deabc0 [ 637.795142][ C1] RBP: 000000000000000d R08: 0000000000000000 R09: 00000000ffffffff [ 637.795146][ C1] R10: 0000000000000069 R11: 0000000000000246 R12: 00000000ffffffff [ 637.795150][ C1] R13: 00005605a9ddd060 R14: 00007ffe015fbcf0 R15: 00005605a9deac10 [ 637.796178][ T1161] Kernel panic - not syncing: hung_task: blocked tasks [ 638.079134][ T1161] CPU: 0 PID: 1161 Comm: khungtaskd Not tainted 5.8.0-syzkaller #0 [ 638.086992][ T1161] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 638.097017][ T1161] Call Trace: [ 638.100292][ T1161] dump_stack+0x18f/0x20d [ 638.104662][ T1161] panic+0x2e3/0x75c [ 638.108555][ T1161] ? __warn_printk+0xf3/0xf3 [ 638.113121][ T1161] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 638.118726][ T1161] ? preempt_schedule_thunk+0x16/0x18 [ 638.124072][ T1161] ? watchdog.cold+0x5/0x16b [ 638.128635][ T1161] ? watchdog+0xa82/0x1000 [ 638.133028][ T1161] watchdog.cold+0x16/0x16b [ 638.137508][ T1161] ? reset_hung_task_detector+0x30/0x30 [ 638.143063][ T1161] kthread+0x3b5/0x4a0 [ 638.147109][ T1161] ? __kthread_bind_mask+0xc0/0xc0 [ 638.152191][ T1161] ? __kthread_bind_mask+0xc0/0xc0 [ 638.157294][ T1161] ret_from_fork+0x1f/0x30 [ 638.163070][ T1161] Kernel Offset: disabled [ 638.167397][ T1161] Rebooting in 86400 seconds..