[ 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 '10.128.0.29' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 640.288889] EXT4-fs (loop0): mounted filesystem without journal. Opts: errors=remount-ro,nombcache,usrquota, [ 857.966862] INFO: task syz-executor291:7976 blocked for more than 140 seconds. [ 857.974307] Not tainted 4.14.296-syzkaller #0 [ 857.980155] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 857.988180] syz-executor291 D26864 7976 7975 0x00000004 [ 857.993792] Call Trace: [ 857.996362] __schedule+0x88b/0x1de0 [ 858.000283] ? mark_held_locks+0xa6/0xf0 [ 858.004339] ? io_schedule_timeout+0x140/0x140 [ 858.008952] schedule+0x8d/0x1b0 [ 858.012313] io_schedule+0xb5/0x120 [ 858.015918] bit_wait_io+0x12/0x90 [ 858.019493] __wait_on_bit_lock+0xc2/0x1d0 [ 858.023720] ? bit_wait+0x90/0x90 [ 858.027200] ? mark_buffer_dirty_inode+0x2ce/0x3a0 [ 858.032125] out_of_line_wait_on_bit_lock+0xbc/0xd0 [ 858.037202] ? __wait_on_bit_lock+0x1d0/0x1d0 [ 858.041690] ? bit_waitqueue+0x30/0x30 [ 858.045559] __lock_buffer+0x43/0x50 [ 858.049308] __sync_dirty_buffer+0x214/0x290 [ 858.053708] __ext4_handle_dirty_metadata+0x169/0x480 [ 858.058938] ext4_convert_inline_data_nolock+0x8d8/0xc60 [ 858.064383] ? ext4_read_inline_page+0x560/0x560 [ 858.069177] ext4_try_add_inline_entry+0x2a5/0x4a0 [ 858.074109] ? ext4_da_write_inline_data_end+0x410/0x410 [ 858.079601] ext4_add_entry+0x2ee/0xa40 [ 858.083573] ? ext4_prepare_inline_data+0x166/0x1c0 [ 858.088615] ? set_nlink+0xc4/0x120 [ 858.092244] ? make_indexed_dir+0xe20/0xe20 [ 858.096551] ext4_mkdir+0x5cf/0xbd0 [ 858.100226] ? ext4_init_dot_dotdot+0x5a0/0x5a0 [ 858.104888] ? security_inode_mkdir+0xca/0x100 [ 858.109502] vfs_mkdir+0x463/0x6e0 [ 858.113040] SyS_mkdirat+0x1fd/0x270 [ 858.116799] ? SyS_mknod+0x30/0x30 [ 858.120335] ? __do_page_fault+0x159/0xad0 [ 858.124550] ? do_syscall_64+0x4c/0x640 [ 858.128551] ? SyS_mknod+0x30/0x30 [ 858.132095] do_syscall_64+0x1d5/0x640 [ 858.135966] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 858.141185] RIP: 0033:0x7f8b568f6979 [ 858.144883] RSP: 002b:00007ffdfb48f9d8 EFLAGS: 00000246 ORIG_RAX: 0000000000000102 [ 858.152615] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f8b568f6979 [ 858.159930] RDX: 0000000000000000 RSI: 0000000020000200 RDI: 0000000000000003 [ 858.167224] RBP: 0000000000000000 R08: 00007f8b56964ec0 R09: 00007f8b56964ec0 [ 858.174483] R10: 00007f8b56964ec0 R11: 0000000000000246 R12: 00007ffdfb48fa00 [ 858.181790] R13: 0000000000000000 R14: 431bde82d7b634db R15: 0000000000000000 [ 858.189123] [ 858.189123] Showing all locks held in the system: [ 858.195440] 1 lock held by khungtaskd/1533: [ 858.199851] #0: (tasklist_lock){.+.+}, at: [] debug_show_all_locks+0x7c/0x21a [ 858.208975] 1 lock held by in:imklog/7701: [ 858.213189] #0: (&f->f_pos_lock){+.+.}, at: [] __fdget_pos+0x1fb/0x2b0 [ 858.221639] 3 locks held by syz-executor291/7976: [ 858.226470] #0: (sb_writers#3){.+.+}, at: [] mnt_want_write+0x3a/0xb0 [ 858.234844] #1: (&type->i_mutex_dir_key#3/1){+.+.}, at: [] filename_create+0x12a/0x3f0 [ 858.244708] #2: (&ei->xattr_sem){++++}, at: [] ext4_try_add_inline_entry+0xc2/0x4a0 [ 858.254295] [ 858.255916] ============================================= [ 858.255916] [ 858.263215] NMI backtrace for cpu 1 [ 858.266892] CPU: 1 PID: 1533 Comm: khungtaskd Not tainted 4.14.296-syzkaller #0 [ 858.274326] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/11/2022 [ 858.283674] Call Trace: [ 858.286243] dump_stack+0x1b2/0x281 [ 858.289862] nmi_cpu_backtrace.cold+0x57/0x93 [ 858.294334] ? irq_force_complete_move+0x350/0x350 [ 858.299239] nmi_trigger_cpumask_backtrace+0x13a/0x180 [ 858.304496] watchdog+0x5b9/0xb40 [ 858.307936] ? hungtask_pm_notify+0x50/0x50 [ 858.312234] kthread+0x30d/0x420 [ 858.315574] ? kthread_create_on_node+0xd0/0xd0 [ 858.320221] ret_from_fork+0x24/0x30 [ 858.323978] Sending NMI from CPU 1 to CPUs 0: [ 858.328741] NMI backtrace for cpu 0 [ 858.328745] CPU: 0 PID: 8 Comm: rcu_preempt Not tainted 4.14.296-syzkaller #0 [ 858.328749] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/11/2022 [ 858.328752] task: ffff8880b540e200 task.stack: ffff8880b5418000 [ 858.328755] RIP: 0010:debug_smp_processor_id+0x0/0x20 [ 858.328757] RSP: 0018:ffff8880b541fdb8 EFLAGS: 00000046 [ 858.328762] RAX: 1ffffffff11ef4a8 RBX: 0000000000035000 RCX: 0000000000006190 [ 858.328766] RDX: 1ffffffff11ef4a2 RSI: 0000000000000001 RDI: ffffffff88f7a548 [ 858.328769] RBP: fffffbfff11ef512 R08: ffffffff8b9d3780 R09: 00000000000c0033 [ 858.328772] R10: ffff8880b540ea88 R11: ffff8880b540e200 R12: dffffc0000000000 [ 858.328776] R13: ffffffff88f7a500 R14: ffffffff88f7a540 R15: ffffffff88f7a500 [ 858.328779] FS: 0000000000000000(0000) GS:ffff8880ba400000(0000) knlGS:0000000000000000 [ 858.328782] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 858.328786] CR2: 00007f429ba96000 CR3: 00000000a1b5e000 CR4: 00000000003406f0 [ 858.328789] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 858.328793] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 858.328794] Call Trace: [ 858.328797] rcu_gp_kthread+0x11b0/0x1e60 [ 858.328799] ? force_qs_rnp+0x4f0/0x4f0 [ 858.328801] ? force_qs_rnp+0x4f0/0x4f0 [ 858.328803] kthread+0x30d/0x420 [ 858.328806] ? kthread_create_on_node+0xd0/0xd0 [ 858.328808] ret_from_fork+0x24/0x30 [ 858.328809] Code: 44 ff ff ff e8 32 99 64 fe eb a5 4c 89 ff e8 98 99 64 fe e9 c6 fe ff ff e8 8e 99 64 fe e9 9a fe ff ff 66 0f 1f 84 00 00 00 00 00 bb db 3a fe 48 c7 c6 c0 09 cd 87 48 c7 c7 00 0a cd 87 e9 a8 [ 858.329531] Kernel panic - not syncing: hung_task: blocked tasks [ 858.489717] CPU: 1 PID: 1533 Comm: khungtaskd Not tainted 4.14.296-syzkaller #0 [ 858.497142] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/11/2022 [ 858.506481] Call Trace: [ 858.509059] dump_stack+0x1b2/0x281 [ 858.512673] panic+0x1f9/0x42d [ 858.515842] ? add_taint.cold+0x16/0x16 [ 858.519796] watchdog+0x5ca/0xb40 [ 858.523225] ? hungtask_pm_notify+0x50/0x50 [ 858.527529] kthread+0x30d/0x420 [ 858.530871] ? kthread_create_on_node+0xd0/0xd0 [ 858.535518] ret_from_fork+0x24/0x30 [ 858.539481] Kernel Offset: disabled [ 858.543112] Rebooting in 86400 seconds..