[ 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 '10.128.0.255' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 479.442087] audit: type=1400 audit(1602406706.189:8): avc: denied { execmem } for pid=6491 comm="syz-executor140" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=process permissive=1 [ 479.475134] EXT4-fs (loop0): mounted filesystem without journal. Opts: ,errors=continue [ 638.257090] INFO: task syz-executor140:6492 blocked for more than 140 seconds. [ 638.264580] Not tainted 4.19.150-syzkaller #0 [ 638.271390] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 638.280065] syz-executor140 D26152 6492 6491 0x00000004 [ 638.285828] Call Trace: [ 638.289472] __schedule+0x8e5/0x22e0 [ 638.293191] ? io_schedule_timeout+0x140/0x140 [ 638.299193] schedule+0x8d/0x1b0 [ 638.302573] io_schedule+0xb5/0x120 [ 638.306184] bit_wait_io+0x12/0x90 [ 638.310732] __wait_on_bit_lock+0xb5/0x170 [ 638.314963] ? bit_wait+0x90/0x90 [ 638.319281] out_of_line_wait_on_bit_lock+0xd2/0x100 [ 638.324398] ? __wait_on_bit_lock+0x170/0x170 [ 638.329902] ? init_wait_var_entry+0x1a0/0x1a0 [ 638.334533] __lock_buffer+0x52/0x60 [ 638.338977] __sync_dirty_buffer+0x2a6/0x320 [ 638.343516] __ext4_handle_dirty_metadata+0x234/0x650 [ 638.349447] ext4_convert_inline_data_nolock+0x5c9/0xd30 [ 638.354898] ? ext4_read_inline_page+0x720/0x720 [ 638.360508] ext4_convert_inline_data+0x347/0x39d [ 638.365343] ? ext4_inline_data_truncate+0xa20/0xa20 [ 638.371268] ? find_held_lock+0x2d/0x110 [ 638.375326] ext4_fallocate+0x13b/0x2130 [ 638.380129] ? rcu_read_lock_sched_held+0x174/0x1e0 [ 638.385168] ? rcu_sync_lockdep_assert+0x99/0x100 [ 638.390869] ? ext4_insert_range+0x1540/0x1540 [ 638.396053] vfs_fallocate+0x487/0x9a0 [ 638.401099] __x64_sys_fallocate+0xcf/0x140 [ 638.405564] do_syscall_64+0xf9/0x670 [ 638.410085] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 638.415301] RIP: 0033:0x445489 [ 638.419271] Code: Bad RIP value. [ 638.422626] RSP: 002b:00007ffc17228468 EFLAGS: 00000246 ORIG_RAX: 000000000000011d [ 638.431080] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000445489 [ 638.438799] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003 [ 638.446060] RBP: 00000000006d1018 R08: 0000000000000001 R09: 0000000000000001 [ 638.454034] R10: 000000000000ffe0 R11: 0000000000000246 R12: 00000000004025f0 [ 638.461788] R13: 0000000000402680 R14: 0000000000000000 R15: 0000000000000000 [ 638.469511] [ 638.469511] Showing all locks held in the system: [ 638.475849] 1 lock held by khungtaskd/1094: [ 638.480914] #0: 000000008dc44be5 (rcu_read_lock){....}, at: debug_show_all_locks+0x53/0x291 [ 638.489979] 1 lock held by in:imklog/6231: [ 638.494466] #0: 000000003312ed9f (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xe3/0x100 [ 638.503131] 2 locks held by syz-executor140/6492: [ 638.509597] #0: 000000006bc7431b (sb_writers#3){.+.+}, at: vfs_fallocate+0x7c0/0x9a0 [ 638.518141] #1: 00000000a4d6796d (&ei->xattr_sem){++++}, at: ext4_convert_inline_data+0x20a/0x39d [ 638.528679] [ 638.530308] ============================================= [ 638.530308] [ 638.538432] NMI backtrace for cpu 1 [ 638.542593] CPU: 1 PID: 1094 Comm: khungtaskd Not tainted 4.19.150-syzkaller #0 [ 638.550036] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 638.559388] Call Trace: [ 638.562040] dump_stack+0x22c/0x33e [ 638.566372] nmi_cpu_backtrace.cold+0x18/0x3d [ 638.570906] ? nmi_cpu_backtrace_handler+0x10/0x10 [ 638.575835] nmi_trigger_cpumask_backtrace+0x1a6/0x1eb [ 638.581147] watchdog+0xa62/0x1020 [ 638.584691] ? reset_hung_task_detector+0x30/0x30 [ 638.589629] kthread+0x33f/0x460 [ 638.592997] ? kthread_park+0x180/0x180 [ 638.596969] ret_from_fork+0x24/0x30 [ 638.600906] Sending NMI from CPU 1 to CPUs 0: [ 638.606185] NMI backtrace for cpu 0 [ 638.606191] CPU: 0 PID: 55 Comm: kworker/u4:2 Not tainted 4.19.150-syzkaller #0 [ 638.606196] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 638.606200] Workqueue: writeback wb_workfn (flush-7:0) [ 638.606208] RIP: 0010:__lock_acquire+0x1b9/0x3ff0 [ 638.606218] Code: c0 0f 84 14 04 00 00 49 8d b8 38 01 00 00 be 04 00 00 00 4c 89 44 24 18 e8 c4 6b 53 00 4c 8b 44 24 18 f0 41 ff 80 38 01 00 00 <49> 8d 86 80 08 00 00 48 ba 00 00 00 00 00 fc ff df 48 89 c1 48 89 [ 638.606222] RSP: 0018:ffff8880a9197170 EFLAGS: 00000006 [ 638.606229] RAX: fffffbfff19c5dea RBX: 0000000000000000 RCX: ffffffff8157a06c [ 638.606233] RDX: fffffbfff19c5dea RSI: 0000000000000004 RDI: ffffffff8ce2ef48 [ 638.606238] RBP: 0000000000000000 R08: ffffffff8ce2ee10 R09: fffffbfff19c5de9 [ 638.606243] R10: ffffffff8ce2ef4b R11: 0000000000000003 R12: 0000000000000001 [ 638.606247] R13: 0000000000000000 R14: ffff8880a917e700 R15: ffff8880a2d91580 [ 638.606253] FS: 0000000000000000(0000) GS:ffff8880ae200000(0000) knlGS:0000000000000000 [ 638.606257] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 638.606261] CR2: 00000000006d2080 CR3: 0000000084930000 CR4: 00000000001406f0 [ 638.606266] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 638.606270] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 638.606273] Call Trace: [ 638.606276] ? mark_held_locks+0xf0/0xf0 [ 638.606279] ? mark_held_locks+0xf0/0xf0 [ 638.606283] ? mark_held_locks+0xf0/0xf0 [ 638.606286] ? mark_held_locks+0xf0/0xf0 [ 638.606289] ? __lock_acquire+0x6ec/0x3ff0 [ 638.606292] ? find_held_lock+0x2d/0x110 [ 638.606295] lock_acquire+0x170/0x3f0 [ 638.606299] ? __set_page_dirty_nobuffers+0x109/0x690 [ 638.606302] _raw_spin_lock_irqsave+0x90/0xe0 [ 638.606306] ? __set_page_dirty_nobuffers+0x109/0x690 [ 638.606310] __set_page_dirty_nobuffers+0x109/0x690 [ 638.606313] redirty_page_for_writepage+0x37/0x60 [ 638.606317] __block_write_full_page+0x7b0/0xff0 [ 638.606320] ? bh_uptodate_or_lock+0x100/0x100 [ 638.606324] ? set_init_blocksize+0x240/0x240 [ 638.606327] block_write_full_page+0x202/0x270 [ 638.606331] ? set_init_blocksize+0x240/0x240 [ 638.606334] __writepage+0x5e/0xe0 [ 638.606337] write_cache_pages+0x83b/0x13d0 [ 638.606340] ? tag_pages_for_writeback+0x350/0x350 [ 638.606344] ? write_one_page+0x9b0/0x9b0 [ 638.606347] ? __lock_acquire+0x6ec/0x3ff0 [ 638.606350] ? __lock_acquire+0x6ec/0x3ff0 [ 638.606353] ? mark_held_locks+0xf0/0xf0 [ 638.606356] ? blkdev_readpages+0x30/0x30 [ 638.606360] generic_writepages+0xdb/0x150 [ 638.606364] ? dirty_poll_interval.part.0+0x50/0x50 [ 638.606367] ? mark_held_locks+0xf0/0xf0 [ 638.606371] ? __lock_acquire+0x6ec/0x3ff0 [ 638.606374] ? mark_held_locks+0xf0/0xf0 [ 638.606377] do_writepages+0xe5/0x290 [ 638.606381] ? page_writeback_cpu_online+0x10/0x10 [ 638.606385] ? wbc_attach_and_unlock_inode+0x11d/0xa20 [ 638.606388] __writeback_single_inode+0x113/0x13e0 [ 638.606391] ? _raw_spin_unlock+0x29/0x40 [ 638.606395] ? wbc_attach_and_unlock_inode+0x11d/0xa20 [ 638.606399] writeback_sb_inodes+0x537/0xf10 [ 638.606402] ? do_raw_spin_unlock+0x171/0x240 [ 638.606404] ? wbc_detach_inode+0x890/0x890 [ 638.606407] ? down_read_trylock+0x4e/0x90 [ 638.606410] ? trylock_super+0x1d/0x100 [ 638.606413] __writeback_inodes_wb+0xc6/0x280 [ 638.606415] wb_writeback+0x841/0xd20 [ 638.606419] ? writeback_inodes_wb.constprop.0+0x1d0/0x1d0 [ 638.606421] ? cpumask_next+0x3c/0x40 [ 638.606424] ? get_nr_dirty_inodes+0x1fc/0x2d0 [ 638.606427] wb_workfn+0x924/0x1230 [ 638.606429] ? process_one_work+0x6a7/0x14e0 [ 638.606432] ? inode_wait_for_writeback+0x30/0x30 [ 638.606439] process_one_work+0x796/0x14e0 [ 638.606442] ? init_worker_pool+0x5c0/0x5c0 [ 638.606445] worker_thread+0x64c/0x1130 [ 638.606448] ? __kthread_parkme+0x133/0x1e0 [ 638.606451] ? rescuer_thread+0xce0/0xce0 [ 638.606453] kthread+0x33f/0x460 [ 638.606456] ? kthread_park+0x180/0x180 [ 638.606458] ret_from_fork+0x24/0x30 [ 638.616904] Kernel panic - not syncing: hung_task: blocked tasks [ 638.991329] CPU: 1 PID: 1094 Comm: khungtaskd Not tainted 4.19.150-syzkaller #0 [ 638.998766] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 639.008202] Call Trace: [ 639.010796] dump_stack+0x22c/0x33e [ 639.014859] panic+0x2ac/0x565 [ 639.018052] ? __warn_printk+0xf3/0xf3 [ 639.021943] ? nmi_cpu_backtrace_handler+0x10/0x10 [ 639.026868] ? ___preempt_schedule+0x16/0x18 [ 639.031274] ? watchdog+0xa62/0x1020 [ 639.034986] ? nmi_trigger_cpumask_backtrace+0x15e/0x1eb [ 639.040437] watchdog+0xa73/0x1020 [ 639.043980] ? reset_hung_task_detector+0x30/0x30 [ 639.048820] kthread+0x33f/0x460 [ 639.052183] ? kthread_park+0x180/0x180 [ 639.056154] ret_from_fork+0x24/0x30 [ 639.061789] Kernel Offset: disabled [ 639.065412] Rebooting in 86400 seconds..