[ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... Starting Load/Save RF Kill Switch Status... [ OK ] Started Update UTMP about System Runlevel Changes. [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.15.211' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 477.641210][ T27] audit: type=1400 audit(1597217251.521:8): avc: denied { execmem } for pid=6849 comm="syz-executor293" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=process permissive=1 [ 637.405466][ T1169] INFO: task syz-executor293:6849 blocked for more than 143 seconds. [ 637.413628][ T1169] Not tainted 5.8.0-syzkaller #0 [ 637.419917][ T1169] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 637.428699][ T1169] syz-executor293 D27648 6849 6843 0x80000002 [ 637.435101][ T1169] Call Trace: [ 637.439292][ T1169] __schedule+0x8e5/0x21e0 [ 637.443733][ T1169] ? io_schedule_timeout+0x140/0x140 [ 637.449868][ T1169] ? io_wq_cancel_all+0x5a0/0x5a0 [ 637.454884][ T1169] ? _raw_spin_unlock_irq+0x1f/0x80 [ 637.460862][ T1169] schedule+0xd0/0x2a0 [ 637.464948][ T1169] io_uring_flush+0x740/0xa90 [ 637.470397][ T1169] ? io_req_task_cancel+0x20/0x20 [ 637.475946][ T1169] ? add_wait_queue_exclusive+0x180/0x180 [ 637.481725][ T1169] ? find_held_lock+0x2d/0x110 [ 637.487386][ T1169] ? lock_is_held_type+0xbb/0xf0 [ 637.492324][ T1169] ? io_req_task_cancel+0x20/0x20 [ 637.497721][ T1169] filp_close+0xb4/0x170 [ 637.501980][ T1169] put_files_struct+0x1cc/0x350 [ 637.506879][ T1169] exit_files+0x7e/0xa0 [ 637.511090][ T1169] do_exit+0xb43/0x29f0 [ 637.515230][ T1169] ? mm_update_next_owner+0x7a0/0x7a0 [ 637.520706][ T1169] ? io_submit_sqes+0x2380/0x2380 [ 637.525949][ T1169] ? __sys_socket+0x16d/0x200 [ 637.530628][ T1169] ? lock_is_held_type+0xbb/0xf0 [ 637.535655][ T1169] do_group_exit+0x125/0x310 [ 637.540245][ T1169] __x64_sys_exit_group+0x3a/0x50 [ 637.545258][ T1169] do_syscall_64+0x2d/0x70 [ 637.549736][ T1169] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 637.555731][ T1169] RIP: 0033:0x43f388 [ 637.559616][ T1169] Code: Bad RIP value. [ 637.563674][ T1169] RSP: 002b:00007fff386423f8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 637.573013][ T1169] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043f388 [ 637.581079][ T1169] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 637.589132][ T1169] RBP: 00000000004beb88 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 637.597164][ T1169] R10: 0000000000400b1b R11: 0000000000000246 R12: 0000000000000001 [ 637.605137][ T1169] R13: 00000000006d01a0 R14: 0000000000000000 R15: 0000000000000000 [ 637.613172][ T1169] [ 637.613172][ T1169] Showing all locks held in the system: [ 637.620955][ T1169] 1 lock held by khungtaskd/1169: [ 637.626010][ T1169] #0: ffffffff89bd62c0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 [ 637.635957][ T1169] 1 lock held by in:imklog/6523: [ 637.640870][ T1169] #0: ffff8880a620e370 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 [ 637.650057][ T1169] [ 637.652384][ T1169] ============================================= [ 637.652384][ T1169] [ 637.660838][ T1169] NMI backtrace for cpu 1 [ 637.665165][ T1169] CPU: 1 PID: 1169 Comm: khungtaskd Not tainted 5.8.0-syzkaller #0 [ 637.673026][ T1169] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 637.683074][ T1169] Call Trace: [ 637.686421][ T1169] dump_stack+0x18f/0x20d [ 637.690738][ T1169] nmi_cpu_backtrace.cold+0x70/0xb1 [ 637.695952][ T1169] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 637.701577][ T1169] nmi_trigger_cpumask_backtrace+0x1b3/0x223 [ 637.707573][ T1169] watchdog+0xd7d/0x1000 [ 637.711809][ T1169] ? reset_hung_task_detector+0x30/0x30 [ 637.717354][ T1169] kthread+0x3b5/0x4a0 [ 637.721401][ T1169] ? __kthread_bind_mask+0xc0/0xc0 [ 637.726488][ T1169] ? __kthread_bind_mask+0xc0/0xc0 [ 637.731616][ T1169] ret_from_fork+0x1f/0x30 [ 637.736121][ T1169] Sending NMI from CPU 1 to CPUs 0: [ 637.741733][ C0] NMI backtrace for cpu 0 [ 637.741740][ C0] CPU: 0 PID: 3902 Comm: systemd-journal Not tainted 5.8.0-syzkaller #0 [ 637.741746][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 637.741751][ C0] RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x60 [ 637.741763][ C0] Code: 48 89 ef 5d e9 31 7a 3f 00 5d be 03 00 00 00 e9 76 c2 25 02 66 0f 1f 44 00 00 48 8b be b0 01 00 00 e8 b4 ff ff ff 31 c0 c3 90 <65> 48 8b 14 25 00 ff 01 00 65 8b 05 20 b5 8d 7e a9 00 01 ff 00 48 [ 637.741767][ C0] RSP: 0018:ffffc900015f7da0 EFLAGS: 00000293 [ 637.741775][ C0] RAX: 0000000000000000 RBX: 1ffff920002befbb RCX: ffffffff81c77baa [ 637.741781][ C0] RDX: 1ffff11014d8950f RSI: ffffffff81c77b15 RDI: ffff8880a6c4a878 [ 637.741786][ C0] RBP: 0000000000000001 R08: 0000000000000000 R09: ffffffff8c5eea27 [ 637.741791][ C0] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000001 [ 637.741797][ C0] R13: ffffc900015f7df8 R14: dffffc0000000000 R15: 0000000000000000 [ 637.741803][ C0] FS: 00007f8f6f3a98c0(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 [ 637.741807][ C0] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 637.741813][ C0] CR2: 00007f8f6c75b000 CR3: 00000000a8548000 CR4: 00000000001506f0 [ 637.741818][ C0] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 637.741823][ C0] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 637.741826][ C0] Call Trace: [ 637.741830][ C0] mntput_no_expire+0x15f/0xc50 [ 637.741834][ C0] ? do_raw_spin_unlock+0x171/0x230 [ 637.741838][ C0] ? clone_private_mount+0x140/0x140 [ 637.741841][ C0] ? dput+0x35/0xbc0 [ 637.741844][ C0] ? dput+0x1d9/0xbc0 [ 637.741849][ C0] ? inode_permission.part.0+0xab/0x410 [ 637.741852][ C0] mntput+0x67/0x90 [ 637.741855][ C0] do_faccessat+0x31c/0x820 [ 637.741859][ C0] ? stream_open+0x60/0x60 [ 637.741863][ C0] ? __secure_computing+0x104/0x360 [ 637.741866][ C0] do_syscall_64+0x2d/0x70 [ 637.741871][ C0] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 637.741874][ C0] RIP: 0033:0x7f8f6e6659c7 [ 637.741886][ C0] Code: 83 c4 08 48 3d 01 f0 ff ff 73 01 c3 48 8b 0d c8 d4 2b 00 f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 b8 15 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d a1 d4 2b 00 f7 d8 64 89 01 48 [ 637.741890][ C0] RSP: 002b:00007ffc995eff98 EFLAGS: 00000246 ORIG_RAX: 0000000000000015 [ 637.741899][ C0] RAX: ffffffffffffffda RBX: 00007ffc995f2eb0 RCX: 00007f8f6e6659c7 [ 637.741905][ C0] RDX: 00007f8f6f0d6a00 RSI: 0000000000000000 RDI: 000055e44b1109a3 [ 637.741910][ C0] RBP: 00007ffc995effd0 R08: 0000000000000000 R09: 0000000000000000 [ 637.741915][ C0] R10: 0000000000000069 R11: 0000000000000246 R12: 0000000000000000 [ 637.741921][ C0] R13: 0000000000000000 R14: 00007ffc995f2eb0 R15: 00007ffc995f04c0 [ 637.743130][ T1169] Kernel panic - not syncing: hung_task: blocked tasks [ 638.016229][ T1169] CPU: 1 PID: 1169 Comm: khungtaskd Not tainted 5.8.0-syzkaller #0 [ 638.024086][ T1169] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 638.034134][ T1169] Call Trace: [ 638.037422][ T1169] dump_stack+0x18f/0x20d [ 638.041791][ T1169] panic+0x2e3/0x75c [ 638.045687][ T1169] ? __warn_printk+0xf3/0xf3 [ 638.050254][ T1169] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 638.055860][ T1169] ? preempt_schedule_thunk+0x16/0x18 [ 638.061215][ T1169] ? watchdog.cold+0x5/0x16b [ 638.065794][ T1169] ? watchdog+0xa82/0x1000 [ 638.070196][ T1169] watchdog.cold+0x16/0x16b [ 638.074685][ T1169] ? reset_hung_task_detector+0x30/0x30 [ 638.080206][ T1169] kthread+0x3b5/0x4a0 [ 638.084263][ T1169] ? __kthread_bind_mask+0xc0/0xc0 [ 638.089348][ T1169] ? __kthread_bind_mask+0xc0/0xc0 [ 638.094433][ T1169] ret_from_fork+0x1f/0x30 [ 638.099940][ T1169] Kernel Offset: disabled [ 638.104258][ T1169] Rebooting in 86400 seconds..