[ 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 '10.128.1.68' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 769.956542] EXT4-fs (loop0): warning: checktime reached, running e2fsck is recommended [ 769.966439] EXT4-fs (loop0): mounted filesystem without journal. Opts: ,errors=continue [ 1001.338058] INFO: task syz-executor247:7978 blocked for more than 140 seconds. [ 1001.345477] Not tainted 4.14.302-syzkaller #0 [ 1001.351187] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 1001.359324] syz-executor247 D27448 7978 7977 0x00000004 [ 1001.364949] Call Trace: [ 1001.367522] __schedule+0x88b/0x1de0 [ 1001.371274] ? mark_held_locks+0xa6/0xf0 [ 1001.375330] ? io_schedule_timeout+0x140/0x140 [ 1001.379947] schedule+0x8d/0x1b0 [ 1001.383305] io_schedule+0xb5/0x120 [ 1001.386907] bit_wait_io+0x12/0x90 [ 1001.390471] __wait_on_bit_lock+0xc2/0x1d0 [ 1001.394692] ? bit_wait+0x90/0x90 [ 1001.398197] ? mark_buffer_dirty_inode+0x2ce/0x3a0 [ 1001.403114] out_of_line_wait_on_bit_lock+0xbc/0xd0 [ 1001.408158] ? __wait_on_bit_lock+0x1d0/0x1d0 [ 1001.412640] ? bit_waitqueue+0x30/0x30 [ 1001.416504] __lock_buffer+0x43/0x50 [ 1001.420241] __sync_dirty_buffer+0x214/0x290 [ 1001.424637] __ext4_handle_dirty_metadata+0x169/0x480 [ 1001.429987] ext4_convert_inline_data_nolock+0x8d8/0xc60 [ 1001.435429] ? ext4_read_inline_page+0x560/0x560 [ 1001.440217] ext4_try_add_inline_entry+0x2a5/0x4a0 [ 1001.445138] ? ext4_da_write_inline_data_end+0x410/0x410 [ 1001.450617] ext4_add_entry+0x2ee/0xa40 [ 1001.454579] ? ext4_prepare_inline_data+0x166/0x1c0 [ 1001.459622] ? set_nlink+0xc4/0x120 [ 1001.463236] ? make_indexed_dir+0xe20/0xe20 [ 1001.467539] ext4_mkdir+0x5cf/0xbd0 [ 1001.471193] ? ext4_init_dot_dotdot+0x5a0/0x5a0 [ 1001.475858] ? security_inode_mkdir+0xca/0x100 [ 1001.480481] vfs_mkdir+0x463/0x6e0 [ 1001.484016] SyS_mkdirat+0x1fd/0x270 [ 1001.487717] ? SyS_mknod+0x30/0x30 [ 1001.491282] ? __do_page_fault+0x159/0xad0 [ 1001.495513] ? do_syscall_64+0x4c/0x640 [ 1001.499519] ? SyS_mknod+0x30/0x30 [ 1001.503050] do_syscall_64+0x1d5/0x640 [ 1001.506920] entry_SYSCALL_64_after_hwframe+0x5e/0xd3 [ 1001.512134] RIP: 0033:0x7fb43a343239 [ 1001.515830] RSP: 002b:00007ffdf73c3c98 EFLAGS: 00000246 ORIG_RAX: 0000000000000102 [ 1001.523564] RAX: ffffffffffffffda RBX: 0030656c69662f2e RCX: 00007fb43a343239 [ 1001.530867] RDX: 0000000000000000 RSI: 0000000020000540 RDI: 0000000000000004 [ 1001.538173] RBP: 0000000000000000 R08: 00007fb43a3b1ec0 R09: 00007fb43a3b1ec0 [ 1001.545429] R10: 00007fb43a3b1ec0 R11: 0000000000000246 R12: 00007ffdf73c3cc0 [ 1001.552758] R13: 0000000000000000 R14: 431bde82d7b634db R15: 0000000000000000 [ 1001.560089] [ 1001.560089] Showing all locks held in the system: [ 1001.566396] 1 lock held by khungtaskd/1532: [ 1001.570784] #0: (tasklist_lock){.+.+}, at: [] debug_show_all_locks+0x7c/0x21a [ 1001.579902] 1 lock held by in:imklog/7686: [ 1001.584123] #0: (&f->f_pos_lock){+.+.}, at: [] __fdget_pos+0x1fb/0x2b0 [ 1001.592586] 3 locks held by syz-executor247/7978: [ 1001.597411] #0: (sb_writers#3){.+.+}, at: [] mnt_want_write+0x3a/0xb0 [ 1001.605818] #1: (&type->i_mutex_dir_key#3/1){+.+.}, at: [] filename_create+0x12a/0x3f0 [ 1001.615686] #2: (&ei->xattr_sem){++++}, at: [] ext4_try_add_inline_entry+0xc2/0x4a0 [ 1001.625284] [ 1001.626899] ============================================= [ 1001.626899] [ 1001.633951] NMI backtrace for cpu 1 [ 1001.637569] CPU: 1 PID: 1532 Comm: khungtaskd Not tainted 4.14.302-syzkaller #0 [ 1001.644986] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 [ 1001.654313] Call Trace: [ 1001.656877] dump_stack+0x1b2/0x281 [ 1001.660479] nmi_cpu_backtrace.cold+0x57/0x93 [ 1001.664950] ? irq_force_complete_move+0x350/0x350 [ 1001.669853] nmi_trigger_cpumask_backtrace+0x13a/0x180 [ 1001.675103] watchdog+0x5b9/0xb40 [ 1001.678530] ? hungtask_pm_notify+0x50/0x50 [ 1001.682828] kthread+0x30d/0x420 [ 1001.686169] ? kthread_create_on_node+0xd0/0xd0 [ 1001.690814] ret_from_fork+0x24/0x30 [ 1001.694598] Sending NMI from CPU 1 to CPUs 0: [ 1001.699377] NMI backtrace for cpu 0 [ 1001.699381] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.14.302-syzkaller #0 [ 1001.699386] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 [ 1001.699389] task: ffffffff88e74480 task.stack: ffffffff88e00000 [ 1001.699391] RIP: 0010:check_preemption_disabled+0xc/0x240 [ 1001.699394] RSP: 0018:ffffffff88e07e48 EFLAGS: 00000097 [ 1001.699399] RAX: ffffffff88e74480 RBX: ffffffff88f7ab08 RCX: 1ffffffff11997ac [ 1001.699402] RDX: 0000000000000000 RSI: ffffffff878b2ec0 RDI: ffffffff87cd1280 [ 1001.699406] RBP: dffffc0000000000 R08: 0000000000000000 R09: 0000000000000000 [ 1001.699409] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8880ba42ca80 [ 1001.699412] R13: ffffffff878b2ec0 R14: 0000000000000000 R15: 0000000000000000 [ 1001.699416] FS: 0000000000000000(0000) GS:ffff8880ba400000(0000) knlGS:0000000000000000 [ 1001.699419] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 1001.699422] CR2: 00007f1b02075000 CR3: 00000000a14f8000 CR4: 00000000003406f0 [ 1001.699426] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 1001.699429] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 1001.699431] Call Trace: [ 1001.699433] rcu_eqs_enter_common+0x14d/0x360 [ 1001.699435] do_idle+0x16d/0x3c0 [ 1001.699438] ? trace_event_define_fields_x86_irq_vector+0x28/0x28 [ 1001.699441] cpu_startup_entry+0x14/0x20 [ 1001.699443] start_kernel+0x743/0x763 [ 1001.699445] ? mem_encrypt_init+0x5/0x5 [ 1001.699447] ? load_ucode_bsp+0x1ae/0x1e4 [ 1001.699450] secondary_startup_64+0xa5/0xb0 [ 1001.699451] Code: 4b 97 64 fe e9 46 fb ff ff e8 11 d4 3a fe 4d 89 e5 48 89 ac 24 c8 00 00 00 e9 d7 fb ff ff 90 41 57 41 56 41 55 49 89 f5 41 54 55 <48> 89 fd 53 e8 eb d3 3a fe 65 44 8b 25 d3 9a e7 7c 65 8b 05 ec [ 1001.700148] Kernel panic - not syncing: hung_task: blocked tasks [ 1001.870143] CPU: 1 PID: 1532 Comm: khungtaskd Not tainted 4.14.302-syzkaller #0 [ 1001.877562] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 [ 1001.886886] Call Trace: [ 1001.889452] dump_stack+0x1b2/0x281 [ 1001.893051] panic+0x1f9/0x42d [ 1001.896220] ? add_taint.cold+0x16/0x16 [ 1001.900171] watchdog+0x5ca/0xb40 [ 1001.903600] ? hungtask_pm_notify+0x50/0x50 [ 1001.907903] kthread+0x30d/0x420 [ 1001.911245] ? kthread_create_on_node+0xd0/0xd0 [ 1001.915886] ret_from_fork+0x24/0x30 [ 1001.919884] Kernel Offset: disabled [ 1001.923496] Rebooting in 86400 seconds..