[ 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 '10.128.0.49' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 717.640228] INFO: task syz-executor370:8120 blocked for more than 140 seconds. [ 717.647675] Not tainted 4.19.211-syzkaller #0 [ 717.654030] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 717.662253] syz-executor370 D28520 8120 8115 0x00000004 [ 717.667889] Call Trace: [ 717.670815] __schedule+0x887/0x2040 [ 717.674548] ? io_schedule_timeout+0x140/0x140 [ 717.679117] ? _raw_spin_unlock+0x29/0x40 [ 717.683634] schedule+0x8d/0x1b0 [ 717.687006] fuse_wait_on_page_writeback.isra.0+0x11b/0x170 [ 717.693116] ? fuse_do_ioctl+0x1850/0x1850 [ 717.697461] ? wait_woken+0x250/0x250 [ 717.701590] ? fuse_writepage_locked+0xb63/0x1010 [ 717.706438] ? fuse_writepage_locked+0x1010/0x1010 [ 717.711681] fuse_launder_page+0xb6/0xe0 [ 717.715742] invalidate_inode_pages2_range+0x795/0x1110 [ 717.721422] ? clear_shadow_entry+0x170/0x170 [ 717.725922] ? fuse_file_alloc+0x1d9/0x270 [ 717.730393] ? do_raw_spin_unlock+0x171/0x230 [ 717.734923] ? _raw_spin_unlock+0x29/0x40 [ 717.739231] ? fuse_do_open+0x1c4/0x500 [ 717.743314] fuse_finish_open+0x2e2/0x590 [ 717.747465] fuse_open_common+0x254/0x2c0 [ 717.751661] do_dentry_open+0x4aa/0x1160 [ 717.755719] ? fuse_open_common+0x2c0/0x2c0 [ 717.760024] ? inode_permission.part.0+0x10c/0x450 [ 717.765014] ? chown_common+0x550/0x550 [ 717.768983] ? inode_permission+0x3d/0x140 [ 717.773274] path_openat+0x793/0x2df0 [ 717.777074] ? path_lookupat+0x8d0/0x8d0 [ 717.781188] ? mark_held_locks+0xf0/0xf0 [ 717.785238] ? mark_held_locks+0xf0/0xf0 [ 717.789283] do_filp_open+0x18c/0x3f0 [ 717.793121] ? may_open_dev+0xf0/0xf0 [ 717.796927] ? lock_downgrade+0x720/0x720 [ 717.801127] ? lock_acquire+0x170/0x3c0 [ 717.805090] ? __alloc_fd+0x34/0x570 [ 717.808796] ? do_raw_spin_unlock+0x171/0x230 [ 717.813339] ? _raw_spin_unlock+0x29/0x40 [ 717.817487] ? __alloc_fd+0x28d/0x570 [ 717.821370] do_sys_open+0x3b3/0x520 [ 717.825078] ? filp_open+0x70/0x70 [ 717.828603] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 717.834013] ? trace_hardirqs_off_caller+0x6e/0x210 [ 717.839027] ? do_syscall_64+0x21/0x620 [ 717.843210] do_syscall_64+0xf9/0x620 [ 717.847071] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 717.852294] RIP: 0033:0x7fd9ddd6e4c9 [ 717.856004] Code: Bad RIP value. [ 717.859344] RSP: 002b:00007fd9ddcfe2f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000055 [ 717.867116] RAX: ffffffffffffffda RBX: 00007fd9dddff4d0 RCX: 00007fd9ddd6e4c9 [ 717.874428] RDX: 00007fd9ddd6e4c9 RSI: 0000000000000000 RDI: 0000000020000140 [ 717.881753] RBP: 00007fd9dddcc164 R08: 0000000000000000 R09: 0000000000000000 [ 717.889013] R10: 0000000000000000 R11: 0000000000000246 R12: 0030656c69662f2e [ 717.896349] R13: 00007fd9dddc8158 R14: 00007fd9dddca160 R15: 00007fd9dddff4d8 [ 717.903715] [ 717.903715] Showing all locks held in the system: [ 717.910033] 1 lock held by khungtaskd/1570: [ 717.914451] #0: 00000000bc449516 (rcu_read_lock){....}, at: debug_show_all_locks+0x53/0x265 [ 717.923139] 1 lock held by in:imklog/7812: [ 717.927352] #0: 00000000c698c4d2 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x26f/0x310 [ 717.935376] 2 locks held by syz-executor370/8120: [ 717.940282] #0: 00000000c87021b3 (sb_writers#11){.+.+}, at: mnt_want_write+0x3a/0xb0 [ 717.948255] #1: 00000000ca9d44f4 (&sb->s_type->i_mutex_key#17){+.+.}, at: fuse_open_common+0x1bc/0x2c0 [ 717.957846] [ 717.959466] ============================================= [ 717.959466] [ 717.966868] NMI backtrace for cpu 1 [ 717.970565] CPU: 1 PID: 1570 Comm: khungtaskd Not tainted 4.19.211-syzkaller #0 [ 717.978013] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 717.987345] Call Trace: [ 717.989926] dump_stack+0x1fc/0x2ef [ 717.993539] nmi_cpu_backtrace.cold+0x63/0xa2 [ 717.998020] ? lapic_can_unplug_cpu+0x80/0x80 [ 718.002494] nmi_trigger_cpumask_backtrace+0x1a6/0x1f0 [ 718.007757] watchdog+0x991/0xe60 [ 718.011192] ? reset_hung_task_detector+0x30/0x30 [ 718.016014] kthread+0x33f/0x460 [ 718.019361] ? kthread_park+0x180/0x180 [ 718.023318] ret_from_fork+0x24/0x30 [ 718.027135] Sending NMI from CPU 1 to CPUs 0: [ 718.031797] NMI backtrace for cpu 0 [ 718.031803] CPU: 0 PID: 4692 Comm: systemd-journal Not tainted 4.19.211-syzkaller #0 [ 718.031809] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 718.031813] RIP: 0033:0x7ffcc548a9c8 [ 718.031823] Code: 05 e5 c6 ff ff 48 0f 43 05 dd c6 ff ff c3 c7 07 00 00 00 00 31 c0 c3 66 66 2e 0f 1f 84 00 00 00 00 00 55 48 89 e5 41 55 41 54 <4c> 8d 25 b1 c6 ff ff 48 83 ec 10 83 ff 05 0f 84 7f 01 00 00 41 89 [ 718.031827] RSP: 002b:00007ffcc5427bd0 EFLAGS: 00000206 [ 718.031834] RAX: 00007ffcc548a9c0 RBX: 0000000000000000 RCX: 0000000000000000 [ 718.031839] RDX: 00000000ffffffff RSI: 00007ffcc5427c10 RDI: 0000000000000000 [ 718.031844] RBP: 00007ffcc5427be0 R08: 000056410281f210 R09: 0000000000000000 [ 718.031849] R10: 0000000000000000 R11: 0000000000000202 R12: 00007ffcc5427ca0 [ 718.031854] R13: 00007ffcc5427c98 R14: 00005641023e0958 R15: 0005dcf5803c29c2 [ 718.031858] FS: 00007ff4feb158c0 GS: 0000000000000000 [ 718.032684] Kernel panic - not syncing: hung_task: blocked tasks [ 718.128218] CPU: 1 PID: 1570 Comm: khungtaskd Not tainted 4.19.211-syzkaller #0 [ 718.135641] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 718.144971] Call Trace: [ 718.147545] dump_stack+0x1fc/0x2ef [ 718.151153] panic+0x26a/0x50e [ 718.154329] ? __warn_printk+0xf3/0xf3 [ 718.158195] ? _raw_spin_unlock_irqrestore+0x79/0xe0 [ 718.163373] ? cpumask_next+0x3c/0x40 [ 718.167150] ? printk_safe_flush+0xd6/0x120 [ 718.171450] ? watchdog+0x991/0xe60 [ 718.175084] ? nmi_trigger_cpumask_backtrace+0x15e/0x1f0 [ 718.180533] watchdog+0x9a2/0xe60 [ 718.183981] ? reset_hung_task_detector+0x30/0x30 [ 718.188809] kthread+0x33f/0x460 [ 718.192158] ? kthread_park+0x180/0x180 [ 718.196130] ret_from_fork+0x24/0x30 [ 718.200135] Kernel Offset: disabled [ 718.203759] Rebooting in 86400 seconds..