Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.109' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program syzkaller login: [ 35.512330] hrtimer: interrupt took 45714 ns executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 48.533076] ------------[ cut here ]------------ [ 48.538010] generic_make_request: Trying to write to read-only block-device loop0 (partno 0) executing program [ 48.637327] WARNING: CPU: 1 PID: 2927 at block/blk-core.c:2183 generic_make_request_checks+0x17d9/0x22e0 [ 48.646980] Kernel panic - not syncing: panic_on_warn set ... [ 48.646980] [ 48.654354] CPU: 1 PID: 2927 Comm: kworker/u4:4 Not tainted 4.19.211-syzkaller #0 [ 48.661974] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 48.671340] Workqueue: writeback wb_workfn (flush-7:0) [ 48.676623] Call Trace: [ 48.679255] dump_stack+0x1fc/0x2ef [ 48.682889] panic+0x26a/0x50e [ 48.686085] ? __warn_printk+0xf3/0xf3 [ 48.690010] ? generic_make_request_checks+0x17d9/0x22e0 [ 48.695465] ? __probe_kernel_read+0x130/0x1b0 [ 48.700049] ? __warn.cold+0x5/0x5a [ 48.703680] ? __warn+0xe4/0x200 [ 48.707054] ? generic_make_request_checks+0x17d9/0x22e0 [ 48.712511] __warn.cold+0x20/0x5a [ 48.716067] ? generic_make_request_checks+0x17d9/0x22e0 [ 48.721529] report_bug+0x262/0x2b0 [ 48.725171] do_error_trap+0x1d7/0x310 [ 48.729067] ? math_error+0x310/0x310 [ 48.732859] ? __irq_work_queue_local+0x101/0x160 [ 48.737684] ? irq_work_queue+0x29/0x80 [ 48.741652] ? error_entry+0x72/0xd0 [ 48.745352] ? trace_hardirqs_off_caller+0x6e/0x210 [ 48.750370] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 48.755205] invalid_op+0x14/0x20 [ 48.758660] RIP: 0010:generic_make_request_checks+0x17d9/0x22e0 [ 48.764724] Code: ca 0a 00 00 45 8b b6 1c 05 00 00 48 8d 74 24 68 48 89 ef e8 b9 14 06 00 48 c7 c7 00 29 b2 88 48 89 c6 44 89 f2 e8 4c 94 91 04 <0f> 0b 48 b8 00 00 00 00 00 fc ff df 4c 89 ea 48 c1 ea 03 80 3c 02 [ 48.783632] RSP: 0018:ffff8880abebf170 EFLAGS: 00010286 [ 48.789003] RAX: 0000000000000000 RBX: ffff8880aee62040 RCX: 0000000000000000 [ 48.796277] RDX: 0000000000000000 RSI: ffffffff814dff01 RDI: ffffed10157d7e20 [ 48.803548] RBP: ffff8880aecc15c0 R08: 0000000000000001 R09: 0000000000000000 [ 48.810819] R10: 0000000000000005 R11: 0000000000000000 R12: ffff8880aecc15f0 [ 48.818090] R13: ffff8880aecc15c8 R14: 0000000000000000 R15: 0000000000000000 [ 48.825372] ? vprintk_func+0x81/0x180 [ 48.829260] ? should_fail_bio.isra.0+0xa0/0xa0 [ 48.834044] ? rcu_read_lock_sched_held+0x16c/0x1d0 [ 48.839045] ? kmem_cache_alloc+0x315/0x370 [ 48.843355] generic_make_request+0x23f/0xdf0 [ 48.847832] ? mark_held_locks+0xa6/0xf0 [ 48.851884] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 48.856622] ? blk_put_request+0x110/0x110 [ 48.860846] ? lockdep_hardirqs_on+0x3a8/0x5c0 [ 48.865423] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 48.870173] submit_bio+0xb1/0x430 [ 48.873705] ? generic_make_request+0xdf0/0xdf0 [ 48.878456] ? check_preemption_disabled+0x41/0x280 [ 48.883459] ? guard_bio_eod+0x2a0/0x650 [ 48.887604] submit_bh_wbc+0x5a7/0x760 [ 48.891482] __block_write_full_page+0x71a/0xf60 [ 48.896222] ? block_llseek+0xc0/0xc0 [ 48.900006] block_write_full_page+0x1f3/0x260 [ 48.904568] ? block_llseek+0xc0/0xc0 [ 48.908352] __writepage+0x5e/0xe0 [ 48.911877] write_cache_pages+0x802/0x12d0 [ 48.916189] ? tag_pages_for_writeback+0x2f0/0x2f0 [ 48.921100] ? clear_page_dirty_for_io+0xee0/0xee0 [ 48.926018] ? mark_held_locks+0xf0/0xf0 [ 48.930066] ? __lock_acquire+0x6de/0x3ff0 [ 48.934296] ? blkdev_readpages+0x30/0x30 [ 48.938449] generic_writepages+0xdb/0x150 [ 48.942690] ? dirty_poll_interval.part.0+0x30/0x30 [ 48.947724] ? mark_held_locks+0xf0/0xf0 [ 48.951789] ? __lock_acquire+0x6de/0x3ff0 [ 48.956034] do_writepages+0xe5/0x290 [ 48.959845] ? page_writeback_cpu_online+0x10/0x10 [ 48.964774] ? lock_downgrade+0x720/0x720 [ 48.968909] ? check_preemption_disabled+0x41/0x280 [ 48.973914] __writeback_single_inode+0x10c/0x11d0 [ 48.978829] writeback_sb_inodes+0x537/0xef0 [ 48.983233] ? wbc_detach_inode+0x840/0x840 [ 48.987632] ? down_read_trylock+0x4e/0x90 [ 48.991847] ? trylock_super+0x1d/0x100 [ 48.995829] __writeback_inodes_wb+0xc6/0x280 [ 49.000310] wb_writeback+0x841/0xcc0 [ 49.004095] ? writeback_inodes_wb.constprop.0+0x1d0/0x1d0 [ 49.009706] ? cpumask_next+0x3c/0x40 [ 49.013489] ? get_nr_dirty_inodes+0x19e/0x210 [ 49.018053] wb_workfn+0xacd/0x1250 [ 49.021665] ? inode_wait_for_writeback+0x30/0x30 [ 49.026497] process_one_work+0x864/0x1570 [ 49.030717] ? pwq_dec_nr_in_flight+0x2d0/0x2d0 [ 49.035371] worker_thread+0x64c/0x1130 [ 49.039336] ? process_one_work+0x1570/0x1570 [ 49.043811] kthread+0x33f/0x460 [ 49.047161] ? kthread_park+0x180/0x180 [ 49.051118] ret_from_fork+0x24/0x30 [ 49.055220] Kernel Offset: disabled [ 49.058872] Rebooting in 86400 seconds..