[ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... [ OK ] Started Update UTMP about System Runlevel Changes. Starting Load/Save RF Kill Switch Status... [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.20' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 717.601429] INFO: task syz-executor252:8116 blocked for more than 140 seconds. [ 717.608876] Not tainted 4.19.211-syzkaller #0 [ 717.614894] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 717.623319] syz-executor252 D27920 8116 8114 0x00000004 [ 717.628942] Call Trace: [ 717.631820] __schedule+0x887/0x2040 [ 717.635536] ? io_schedule_timeout+0x140/0x140 [ 717.640198] ? _raw_spin_unlock+0x29/0x40 [ 717.644713] schedule+0x8d/0x1b0 [ 717.648084] fuse_wait_on_page_writeback.isra.0+0x11b/0x170 [ 717.654098] ? fuse_do_ioctl+0x1850/0x1850 [ 717.658332] ? wait_woken+0x250/0x250 [ 717.662448] ? fuse_writepage_locked+0xb63/0x1010 [ 717.667299] ? fuse_writepage_locked+0x1010/0x1010 [ 717.672570] fuse_launder_page+0xb6/0xe0 [ 717.676638] invalidate_inode_pages2_range+0x795/0x1110 [ 717.682308] ? clear_shadow_entry+0x170/0x170 [ 717.686805] ? fuse_file_alloc+0x1d9/0x270 [ 717.691031] ? do_raw_spin_unlock+0x171/0x230 [ 717.695848] ? _raw_spin_unlock+0x29/0x40 [ 717.699994] ? fuse_do_open+0x1c4/0x500 [ 717.704269] fuse_finish_open+0x2e2/0x590 [ 717.708417] fuse_open_common+0x254/0x2c0 [ 717.713026] do_dentry_open+0x4aa/0x1160 [ 717.717081] ? fuse_open_common+0x2c0/0x2c0 [ 717.721692] ? inode_permission.part.0+0x10c/0x450 [ 717.726616] ? chown_common+0x550/0x550 [ 717.730570] ? inode_permission+0x3d/0x140 [ 717.735256] path_openat+0x793/0x2df0 [ 717.739059] ? path_lookupat+0x8d0/0x8d0 [ 717.743402] ? mark_held_locks+0xf0/0xf0 [ 717.747464] do_filp_open+0x18c/0x3f0 [ 717.751499] ? may_open_dev+0xf0/0xf0 [ 717.755310] ? lock_downgrade+0x720/0x720 [ 717.759437] ? lock_acquire+0x170/0x3c0 [ 717.763596] ? __alloc_fd+0x34/0x570 [ 717.767304] ? do_raw_spin_unlock+0x171/0x230 [ 717.771831] ? _raw_spin_unlock+0x29/0x40 [ 717.775971] ? __alloc_fd+0x28d/0x570 [ 717.779753] do_sys_open+0x3b3/0x520 [ 717.783517] ? filp_open+0x70/0x70 [ 717.787052] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 717.792456] ? trace_hardirqs_off_caller+0x6e/0x210 [ 717.797899] ? do_syscall_64+0x21/0x620 [ 717.801920] do_syscall_64+0xf9/0x620 [ 717.805712] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 717.810878] RIP: 0033:0x7f8e590c64c9 [ 717.814622] Code: Bad RIP value. [ 717.817977] RSP: 002b:00007f8e590772f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000055 [ 717.825724] RAX: ffffffffffffffda RBX: 00007f8e591574c0 RCX: 00007f8e590c64c9 [ 717.833044] RDX: 00007f8e590c64c9 RSI: 0000000000000140 RDI: 00000000200001c0 [ 717.840304] RBP: 00007f8e59124164 R08: 0000000000000000 R09: 0000000000000000 [ 717.847624] R10: 0000000000000000 R11: 0000000000000246 R12: 0030656c69662f2e [ 717.854942] R13: 00007f8e59120158 R14: 00007f8e59122160 R15: 00007f8e591574c8 [ 717.862287] [ 717.862287] Showing all locks held in the system: [ 717.868608] 1 lock held by khungtaskd/1571: [ 717.872958] #0: 00000000fb378684 (rcu_read_lock){....}, at: debug_show_all_locks+0x53/0x265 [ 717.881633] 1 lock held by in:imklog/7811: [ 717.885844] #0: 00000000d8291f7d (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x26f/0x310 [ 717.893882] 2 locks held by syz-executor252/8116: [ 717.898715] #0: 000000004bd28fe9 (sb_writers#11){.+.+}, at: mnt_want_write+0x3a/0xb0 [ 717.906761] #1: 0000000046266e71 (&sb->s_type->i_mutex_key#17){+.+.}, at: fuse_open_common+0x1bc/0x2c0 [ 717.916375] [ 717.917990] ============================================= [ 717.917990] [ 717.925061] NMI backtrace for cpu 0 [ 717.928676] CPU: 0 PID: 1571 Comm: khungtaskd Not tainted 4.19.211-syzkaller #0 [ 717.936097] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 717.945432] Call Trace: [ 717.948006] dump_stack+0x1fc/0x2ef [ 717.951613] nmi_cpu_backtrace.cold+0x63/0xa2 [ 717.956198] ? lapic_can_unplug_cpu+0x80/0x80 [ 717.960673] nmi_trigger_cpumask_backtrace+0x1a6/0x1f0 [ 717.965932] watchdog+0x991/0xe60 [ 717.969370] ? reset_hung_task_detector+0x30/0x30 [ 717.974192] kthread+0x33f/0x460 [ 717.977552] ? kthread_park+0x180/0x180 [ 717.981511] ret_from_fork+0x24/0x30 [ 717.985320] Sending NMI from CPU 0 to CPUs 1: [ 717.990094] NMI backtrace for cpu 1 [ 717.990100] CPU: 1 PID: 4686 Comm: systemd-journal Not tainted 4.19.211-syzkaller #0 [ 717.990106] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 717.990110] RIP: 0010:filename_lookup+0x0/0x5a0 [ 717.990121] Code: e6 e4 90 ff 48 8b 7c 24 18 e8 9c a4 f1 ff e9 89 fc ff ff e8 32 a1 f1 ff e9 fa fe ff ff 66 66 2e 0f 1f 84 00 00 00 00 00 66 90 <55> 48 89 e5 41 57 49 89 cf 41 56 49 89 f6 41 55 49 bd 00 00 00 00 [ 717.990125] RSP: 0018:ffff8880a111fe68 EFLAGS: 00000246 [ 717.990133] RAX: ffff8880b05c0c80 RBX: 0000000000000000 RCX: ffff8880a111feb0 [ 717.990138] RDX: 0000000000000001 RSI: ffff8880b05c0c80 RDI: 00000000ffffff9c [ 717.990143] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 [ 717.990148] R10: 0000000000000005 R11: 0000000000000000 R12: 0000000000000001 [ 717.990153] R13: ffff8880ae689900 R14: ffff8880a111feb0 R15: 0000000000000000 [ 717.990159] FS: 00007f15ab5778c0(0000) GS:ffff8880ba100000(0000) knlGS:0000000000000000 [ 717.990163] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 717.990168] CR2: 00007f15a8947000 CR3: 00000000a1127000 CR4: 00000000003406e0 [ 717.990173] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 717.990178] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 717.990181] Call Trace: [ 717.990184] do_faccessat+0x248/0x7a0 [ 717.990188] ? __ia32_sys_fallocate+0x140/0x140 [ 717.990192] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 717.990196] ? trace_hardirqs_off_caller+0x6e/0x210 [ 717.990199] ? do_syscall_64+0x21/0x620 [ 717.990202] do_syscall_64+0xf9/0x620 [ 717.990206] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 717.990210] RIP: 0033:0x7f15aa8329c7 [ 717.990220] 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 [ 717.990224] RSP: 002b:00007fffd54fc138 EFLAGS: 00000246 ORIG_RAX: 0000000000000015 [ 717.990233] RAX: ffffffffffffffda RBX: 00007fffd54ff050 RCX: 00007f15aa8329c7 [ 717.990238] RDX: 00007f15ab2a3a00 RSI: 0000000000000000 RDI: 0000561048c859a3 [ 717.990243] RBP: 00007fffd54fc170 R08: 0000000000000000 R09: 0000000000000000 [ 717.990248] R10: 0000000000000069 R11: 0000000000000246 R12: 0000000000000000 [ 717.990252] R13: 0000000000000000 R14: 00007fffd54ff050 R15: 00007fffd54fc660 [ 717.990859] Kernel panic - not syncing: hung_task: blocked tasks [ 718.218718] CPU: 0 PID: 1571 Comm: khungtaskd Not tainted 4.19.211-syzkaller #0 [ 718.226138] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 718.235469] Call Trace: [ 718.238040] dump_stack+0x1fc/0x2ef [ 718.241648] panic+0x26a/0x50e [ 718.244828] ? __warn_printk+0xf3/0xf3 [ 718.248694] ? lapic_can_unplug_cpu+0x80/0x80 [ 718.253165] ? ___preempt_schedule+0x16/0x18 [ 718.257553] ? watchdog+0x991/0xe60 [ 718.261156] ? nmi_trigger_cpumask_backtrace+0x15e/0x1f0 [ 718.266587] watchdog+0x9a2/0xe60 [ 718.270018] ? reset_hung_task_detector+0x30/0x30 [ 718.274836] kthread+0x33f/0x460 [ 718.278179] ? kthread_park+0x180/0x180 [ 718.282132] ret_from_fork+0x24/0x30 [ 718.286085] Kernel Offset: disabled [ 718.289703] Rebooting in 86400 seconds..