[ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... Starting Load/Save RF Kill Switch Status... [ OK ] Started Load/Save RF Kill Switch Status. [ OK ] Started Update UTMP about System Runlevel Changes. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.235' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 711.221775] EXT4-fs (loop0): mounted filesystem without journal. Opts: ,errors=continue [ 857.965245] INFO: task syz-executor417:7970 blocked for more than 140 seconds. [ 857.965258] Not tainted 4.14.280-syzkaller #0 [ 857.965261] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 857.965265] syz-executor417 D27080 7970 7969 0x00000004 [ 857.991552] Call Trace: [ 857.994126] __schedule+0x88b/0x1de0 [ 857.997869] ? mark_held_locks+0xa6/0xf0 [ 858.001926] ? io_schedule_timeout+0x140/0x140 [ 858.006655] schedule+0x8d/0x1b0 [ 858.010013] io_schedule+0xb5/0x120 [ 858.013618] bit_wait_io+0x12/0x90 [ 858.017301] __wait_on_bit_lock+0xc2/0x1d0 [ 858.021773] ? bit_wait+0x90/0x90 [ 858.025255] ? mark_buffer_dirty_inode+0x2ce/0x3a0 [ 858.030182] out_of_line_wait_on_bit_lock+0xbc/0xd0 [ 858.035233] ? __wait_on_bit_lock+0x1d0/0x1d0 [ 858.039720] ? bit_waitqueue+0x30/0x30 [ 858.043587] __lock_buffer+0x43/0x50 [ 858.047318] __sync_dirty_buffer+0x214/0x290 [ 858.051716] __ext4_handle_dirty_metadata+0x169/0x480 [ 858.056930] ext4_convert_inline_data_nolock+0x4e1/0xbd0 [ 858.062457] ? ext4_read_inline_page+0x560/0x560 [ 858.067244] ext4_convert_inline_data+0x2ae/0x300 [ 858.073757] ? ext4_inline_data_truncate+0x940/0x940 [ 858.078890] ? __fd_install+0x227/0x5c0 [ 858.082858] ext4_fallocate+0x106/0x1d80 [ 858.086945] ? rcu_lockdep_current_cpu_online+0xed/0x140 [ 858.092384] ? ext4_insert_range+0x1340/0x1340 [ 858.096994] vfs_fallocate+0x346/0x790 [ 858.101041] SyS_fallocate+0x4a/0x80 [ 858.104729] ? compat_SyS_ftruncate+0x20/0x20 [ 858.109250] do_syscall_64+0x1d5/0x640 [ 858.113128] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 858.118352] RIP: 0033:0x7f079df14999 [ 858.122048] RSP: 002b:00007ffe64dbe7a8 EFLAGS: 00000246 ORIG_RAX: 000000000000011d [ 858.129778] RAX: ffffffffffffffda RBX: 0030656c69662f2e RCX: 00007f079df14999 [ 858.137072] RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000004 [ 858.144328] RBP: 00007ffe64dbe7d0 R08: 00007ffe64dbe640 R09: 0000000000000000 [ 858.151613] R10: 0000000000000040 R11: 0000000000000246 R12: 00007ffe64dbe7d0 [ 858.158910] R13: 0000000000000000 R14: 431bde82d7b634db R15: 0000000000000000 [ 858.166230] [ 858.166230] Showing all locks held in the system: [ 858.172537] 1 lock held by khungtaskd/1533: [ 858.176917] #0: (tasklist_lock){.+.+}, at: [] debug_show_all_locks+0x7c/0x21a [ 858.186106] 1 lock held by in:imklog/7650: [ 858.190316] #0: (&f->f_pos_lock){+.+.}, at: [] __fdget_pos+0x1fb/0x2b0 [ 858.198750] 2 locks held by syz-executor417/7970: [ 858.203574] #0: (sb_writers#3){.+.+}, at: [] vfs_fallocate+0x5c1/0x790 [ 858.212027] #1: (&ei->xattr_sem){++++}, at: [] ext4_convert_inline_data+0x19d/0x300 [ 858.221610] [ 858.223223] ============================================= [ 858.223223] [ 858.230286] NMI backtrace for cpu 0 [ 858.233902] CPU: 0 PID: 1533 Comm: khungtaskd Not tainted 4.14.280-syzkaller #0 [ 858.241407] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 858.250732] Call Trace: [ 858.253297] dump_stack+0x1b2/0x281 [ 858.256898] nmi_cpu_backtrace.cold+0x57/0x93 [ 858.261366] ? irq_force_complete_move+0x350/0x350 [ 858.266269] nmi_trigger_cpumask_backtrace+0x13a/0x180 [ 858.271610] watchdog+0x5b9/0xb40 [ 858.275062] ? hungtask_pm_notify+0x50/0x50 [ 858.279359] kthread+0x30d/0x420 [ 858.282699] ? kthread_create_on_node+0xd0/0xd0 [ 858.287342] ret_from_fork+0x24/0x30 [ 858.291099] Sending NMI from CPU 0 to CPUs 1: [ 858.295660] NMI backtrace for cpu 1 skipped: idling at pc 0xffffffff87246a1e [ 858.296627] Kernel panic - not syncing: hung_task: blocked tasks [ 858.308971] CPU: 0 PID: 1533 Comm: khungtaskd Not tainted 4.14.280-syzkaller #0 [ 858.316389] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 858.325803] Call Trace: [ 858.328367] dump_stack+0x1b2/0x281 [ 858.331976] panic+0x1f9/0x42d [ 858.335160] ? add_taint.cold+0x16/0x16 [ 858.339116] watchdog+0x5ca/0xb40 [ 858.342553] ? hungtask_pm_notify+0x50/0x50 [ 858.346849] kthread+0x30d/0x420 [ 858.350192] ? kthread_create_on_node+0xd0/0xd0 [ 858.354838] ret_from_fork+0x24/0x30 [ 858.358705] Kernel Offset: disabled [ 858.362315] Rebooting in 86400 seconds..