[ 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 '10.128.1.41' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program syzkaller login: [ 64.083145] ------------[ cut here ]------------ [ 64.088100] generic_make_request: Trying to write to read-only block-device sda1 (partno 1) [ 64.097095] WARNING: CPU: 1 PID: 359 at block/blk-core.c:2183 generic_make_request_checks+0x1f9b/0x22e0 [ 64.106635] Kernel panic - not syncing: panic_on_warn set ... [ 64.106635] [ 64.113994] CPU: 1 PID: 359 Comm: kworker/u4:3 Not tainted 4.19.204-syzkaller #0 [ 64.121508] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 64.130854] Workqueue: writeback wb_workfn (flush-8:0) [ 64.136111] Call Trace: [ 64.138698] dump_stack+0x1fc/0x2ef [ 64.142316] panic+0x26a/0x50e [ 64.145494] ? __warn_printk+0xf3/0xf3 [ 64.149370] ? generic_make_request_checks+0x1f9b/0x22e0 [ 64.154820] ? __probe_kernel_read+0x130/0x1b0 [ 64.159386] ? __warn.cold+0x5/0x5a [ 64.162997] ? __warn+0xe4/0x200 [ 64.166354] ? generic_make_request_checks+0x1f9b/0x22e0 [ 64.171793] __warn.cold+0x20/0x5a [ 64.175332] ? generic_make_request_checks+0x1f9b/0x22e0 [ 64.180765] report_bug+0x262/0x2b0 [ 64.184380] do_error_trap+0x1d7/0x310 [ 64.188262] ? math_error+0x310/0x310 [ 64.192049] ? __irq_work_queue_local+0x101/0x160 [ 64.197073] ? irq_work_queue+0x29/0x80 [ 64.201299] ? error_entry+0x72/0xd0 [ 64.204999] ? trace_hardirqs_off_caller+0x6e/0x210 [ 64.210003] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 64.214837] invalid_op+0x14/0x20 [ 64.218279] RIP: 0010:generic_make_request_checks+0x1f9b/0x22e0 [ 64.224335] Code: 2c 03 00 00 45 8b be 9c 04 00 00 48 8d 74 24 68 48 89 ef e8 f7 0c 06 00 48 c7 c7 00 28 b2 88 48 89 c6 44 89 fa e8 45 56 91 04 <0f> 0b 48 b8 00 00 00 00 00 fc ff df 4c 89 e2 48 c1 ea 03 0f b6 04 [ 64.243740] RSP: 0018:ffff8880b4f37170 EFLAGS: 00010286 [ 64.249087] RAX: 0000000000000000 RBX: ffff8880ac26e000 RCX: 0000000000000000 [ 64.256429] RDX: 0000000000000000 RSI: ffffffff814e0d61 RDI: ffffed10169e6e20 [ 64.263680] RBP: ffff8880b25202c0 R08: 0000000000000001 R09: 0000000000000000 [ 64.270939] R10: 0000000000000005 R11: 0000000000000000 R12: ffff8880b25202f0 [ 64.278190] R13: ffff8880b25202c8 R14: ffff8880a8838480 R15: 0000000000000001 [ 64.285454] ? vprintk_func+0x81/0x180 [ 64.289340] ? should_fail_bio.isra.0+0xa0/0xa0 [ 64.293998] ? rcu_read_lock_sched_held+0x16c/0x1d0 [ 64.299012] ? kmem_cache_alloc+0x315/0x370 [ 64.303323] generic_make_request+0x23f/0xdf0 [ 64.307894] ? blk_put_request+0x110/0x110 [ 64.312117] ? sb_mark_inode_writeback+0xc8/0x490 [ 64.316953] submit_bio+0xb1/0x430 [ 64.320502] ? generic_make_request+0xdf0/0xdf0 [ 64.325156] ? check_preemption_disabled+0x41/0x280 [ 64.330164] ? guard_bio_eod+0x2a0/0x650 [ 64.334212] submit_bh_wbc+0x5a7/0x760 [ 64.338090] __block_write_full_page+0x71a/0xf60 [ 64.342923] ? block_llseek+0xc0/0xc0 [ 64.346716] block_write_full_page+0x1f3/0x260 [ 64.351287] ? block_llseek+0xc0/0xc0 [ 64.355077] __writepage+0x5e/0xe0 [ 64.358626] write_cache_pages+0x802/0x12d0 [ 64.363027] ? tag_pages_for_writeback+0x2f0/0x2f0 [ 64.367957] ? clear_page_dirty_for_io+0xee0/0xee0 [ 64.372882] ? mark_held_locks+0xf0/0xf0 [ 64.376971] ? __lock_acquire+0x6de/0x3ff0 [ 64.381277] ? blkdev_readpages+0x30/0x30 [ 64.385410] generic_writepages+0xdb/0x150 [ 64.389633] ? dirty_poll_interval.part.0+0x30/0x30 [ 64.394649] ? mark_held_locks+0xf0/0xf0 [ 64.398693] ? __lock_acquire+0x6de/0x3ff0 [ 64.402917] do_writepages+0xe5/0x290 [ 64.406720] ? page_writeback_cpu_online+0x10/0x10 [ 64.411639] ? lock_downgrade+0x720/0x720 [ 64.415776] ? check_preemption_disabled+0x41/0x280 [ 64.420783] __writeback_single_inode+0x10c/0x11d0 [ 64.425700] writeback_sb_inodes+0x537/0xef0 [ 64.430101] ? wbc_detach_inode+0x840/0x840 [ 64.434412] ? down_read_trylock+0x4e/0x90 [ 64.438634] ? trylock_super+0x1d/0x100 [ 64.442608] __writeback_inodes_wb+0xc6/0x280 [ 64.447179] wb_writeback+0x841/0xcc0 [ 64.450971] ? writeback_inodes_wb.constprop.0+0x1d0/0x1d0 [ 64.456594] ? cpumask_next+0x3c/0x40 [ 64.460378] ? get_nr_dirty_inodes+0x19e/0x210 [ 64.464953] wb_workfn+0x8ba/0x1250 [ 64.468574] ? inode_wait_for_writeback+0x30/0x30 [ 64.473413] process_one_work+0x864/0x1570 [ 64.477639] ? pwq_dec_nr_in_flight+0x2d0/0x2d0 [ 64.482300] worker_thread+0x64c/0x1130 [ 64.486263] ? __kthread_parkme+0x133/0x1e0 [ 64.490569] ? process_one_work+0x1570/0x1570 [ 64.495059] kthread+0x33f/0x460 [ 64.498422] ? kthread_park+0x180/0x180 [ 64.502491] ret_from_fork+0x24/0x30 [ 64.507787] Kernel Offset: disabled [ 64.511442] Rebooting in 86400 seconds..