[ 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 '10.128.0.90' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 53.320075] audit: type=1400 audit(1602263727.944:8): avc: denied { execmem } for pid=6516 comm="syz-executor669" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=process permissive=1 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 61.565838] ------------[ cut here ]------------ [ 61.570756] generic_make_request: Trying to write to read-only block-device sda1 (partno 1) [ 61.581382] WARNING: CPU: 1 PID: 3021 at block/blk-core.c:2182 generic_make_request_checks+0x20c7/0x2420 [ 61.591025] Kernel panic - not syncing: panic_on_warn set ... [ 61.591025] [ 61.598395] CPU: 1 PID: 3021 Comm: kworker/u4:5 Not tainted 4.19.150-syzkaller #0 [ 61.606003] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 61.615380] Workqueue: writeback wb_workfn (flush-8:0) [ 61.620675] Call Trace: [ 61.623289] dump_stack+0x22c/0x33e [ 61.626936] panic+0x2ac/0x565 [ 61.630142] ? __warn_printk+0xf3/0xf3 [ 61.634042] ? generic_make_request_checks+0x20c7/0x2420 [ 61.639488] ? __probe_kernel_read+0x130/0x1b0 [ 61.644081] ? __warn.cold+0x5/0x5a [ 61.647707] ? __warn+0xe4/0x200 [ 61.651073] ? generic_make_request_checks+0x20c7/0x2420 [ 61.656532] __warn.cold+0x20/0x5a [ 61.660075] ? io_schedule_timeout+0x140/0x140 [ 61.664666] ? generic_make_request_checks+0x20c7/0x2420 [ 61.670116] report_bug+0x262/0x2b0 [ 61.673754] do_error_trap+0x1e1/0x330 [ 61.677645] ? math_error+0x320/0x320 [ 61.681451] ? __irq_work_queue_local+0x155/0x200 [ 61.686303] ? irq_work_queue+0x29/0x80 [ 61.690273] ? error_entry+0x72/0xd0 [ 61.693990] ? trace_hardirqs_off_caller+0x6e/0x210 [ 61.699008] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 61.703851] invalid_op+0x14/0x20 [ 61.707311] RIP: 0010:generic_make_request_checks+0x20c7/0x2420 [ 61.713373] Code: fe 01 00 00 45 8b be 9c 04 00 00 48 8d 74 24 70 48 89 ef e8 5b 82 06 00 48 c7 c7 00 1e 50 88 48 89 c6 44 89 fa e8 bf a1 b7 fd <0f> 0b 48 b8 00 00 00 00 00 fc ff df 48 8b 54 24 10 48 c1 ea 03 0f [ 61.732297] RSP: 0018:ffff88809d6f7198 EFLAGS: 00010286 [ 61.737657] RAX: 0000000000000000 RBX: ffff8880a2813080 RCX: 0000000000000000 [ 61.744935] RDX: 0000000000000000 RSI: ffffffff815b623f RDI: ffffed1013adee25 [ 61.752206] RBP: ffff88808f395300 R08: 0000000000000001 R09: 0000000000000000 [ 61.759496] R10: 0000000000000005 R11: 0000000000000000 R12: 0000000000000000 [ 61.766771] R13: ffff88808f395308 R14: ffff88809d62ed80 R15: 0000000000000001 [ 61.774063] ? vprintk_func+0x7f/0x224 [ 61.777954] ? generic_make_request_checks+0x20c7/0x2420 [ 61.783403] ? mark_buffer_dirty+0x51/0x5f0 [ 61.787738] ? should_fail_bio+0xf0/0xf0 [ 61.791793] ? __brelse+0x84/0xa0 [ 61.795266] ? ext4_mark_iloc_dirty+0x17ae/0x2b70 [ 61.800120] generic_make_request+0x279/0xe40 [ 61.804636] ? ext4_chunk_trans_blocks+0x30/0x30 [ 61.809405] ? blk_put_request+0x110/0x110 [ 61.813634] ? __ext4_journal_get_write_access+0x6c/0xa0 [ 61.819103] submit_bio+0xb1/0x480 [ 61.822642] ? generic_make_request+0xe40/0xe40 [ 61.827329] ? lock_downgrade+0x750/0x750 [ 61.831478] ? lock_acquire+0x170/0x3f0 [ 61.835447] ? ext4_writepages+0x28da/0x3a90 [ 61.839853] ext4_io_submit+0x181/0x210 [ 61.843825] ext4_writepages+0x1841/0x3a90 [ 61.848072] ? ext4_mark_inode_dirty+0x890/0x890 [ 61.852836] ? __lock_acquire+0x6ec/0x3ff0 [ 61.857077] ? mark_held_locks+0xf0/0xf0 [ 61.861155] ? __ext4_get_inode_loc+0x46d/0x11d0 [ 61.865925] ? mark_held_locks+0xf0/0xf0 [ 61.869982] ? ext4_mark_inode_dirty+0x890/0x890 [ 61.874743] do_writepages+0xe5/0x290 [ 61.878561] ? page_writeback_cpu_online+0x10/0x10 [ 61.883488] ? wbc_attach_and_unlock_inode+0x11d/0xa20 [ 61.888784] __writeback_single_inode+0x113/0x13e0 [ 61.893727] ? _raw_spin_unlock+0x29/0x40 [ 61.897868] ? wbc_attach_and_unlock_inode+0x11d/0xa20 [ 61.903140] writeback_sb_inodes+0x537/0xf10 [ 61.907550] ? wbc_detach_inode+0x890/0x890 [ 61.911871] ? down_read_trylock+0x4e/0x90 [ 61.916116] ? trylock_super+0x1d/0x100 [ 61.920097] __writeback_inodes_wb+0xc6/0x280 [ 61.924601] wb_writeback+0x841/0xd20 [ 61.928407] ? writeback_inodes_wb.constprop.0+0x1d0/0x1d0 [ 61.934027] ? cpumask_next+0x3c/0x40 [ 61.937819] ? get_nr_dirty_inodes+0x1fc/0x2d0 [ 61.942397] wb_workfn+0x924/0x1230 [ 61.946018] ? process_one_work+0x6a7/0x14e0 [ 61.950441] ? inode_wait_for_writeback+0x30/0x30 [ 61.955294] process_one_work+0x796/0x14e0 [ 61.959526] ? init_worker_pool+0x5c0/0x5c0 [ 61.963859] worker_thread+0x64c/0x1130 [ 61.967844] ? __kthread_parkme+0x133/0x1e0 [ 61.972169] ? rescuer_thread+0xce0/0xce0 [ 61.976324] kthread+0x33f/0x460 [ 61.979683] ? kthread_park+0x180/0x180 [ 61.983663] ret_from_fork+0x24/0x30 [ 61.988650] Kernel Offset: disabled [ 61.992352] Rebooting in 86400 seconds..