[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. [ 28.432852] kauditd_printk_skb: 8 callbacks suppressed [ 28.432865] audit: type=1800 audit(1543145530.349:29): pid=5868 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="rc.local" dev="sda1" ino=2432 res=0 [ 28.459150] audit: type=1800 audit(1543145530.349:30): pid=5868 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="rmnologin" dev="sda1" ino=2423 res=0 Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 32.119135] sshd (6007) used greatest stack depth: 15744 bytes left Warning: Permanently added '10.128.10.5' (ECDSA) to the list of known hosts. executing program executing program [ 53.236063] ------------[ cut here ]------------ [ 53.241407] generic_make_request: Trying to write to read-only block-device loop0 (partno 0) [ 53.250404] WARNING: CPU: 0 PID: 6030 at block/blk-core.c:2170 generic_make_request_checks+0xef9/0x26c0 [ 53.259942] Kernel panic - not syncing: panic_on_warn set ... [ 53.265814] CPU: 0 PID: 6030 Comm: blkid Not tainted 4.20.0-rc3+ #348 [ 53.272378] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 53.281725] Call Trace: [ 53.284319] dump_stack+0x244/0x39d [ 53.287979] ? dump_stack_print_info.cold.1+0x20/0x20 [ 53.293168] panic+0x2ad/0x55c [ 53.296362] ? add_taint.cold.5+0x16/0x16 [ 53.300498] ? __warn.cold.8+0x5/0x45 [ 53.304282] ? __warn+0xe8/0x1d0 [ 53.307663] ? generic_make_request_checks+0xef9/0x26c0 [ 53.313025] __warn.cold.8+0x20/0x45 [ 53.316737] ? rcu_softirq_qs+0x20/0x20 [ 53.320718] ? generic_make_request_checks+0xef9/0x26c0 [ 53.326101] report_bug+0x254/0x2d0 [ 53.329734] do_error_trap+0x11b/0x200 [ 53.333610] do_invalid_op+0x36/0x40 [ 53.337311] ? generic_make_request_checks+0xef9/0x26c0 [ 53.342660] invalid_op+0x14/0x20 [ 53.346114] RIP: 0010:generic_make_request_checks+0xef9/0x26c0 [ 53.352170] Code: 8b ad e4 04 00 00 4c 8d b5 78 ff ff ff 48 89 df 4c 89 f6 e8 99 93 07 00 48 c7 c7 60 2b 5f 88 48 89 c6 44 89 ea e8 d7 d3 cf fd <0f> 0b e9 c1 f4 ff ff e8 6b 73 06 fe e8 26 4b f0 fd e8 61 73 06 fe [ 53.371073] RSP: 0018:ffff8881ccd269d0 EFLAGS: 00010282 [ 53.376425] RAX: 0000000000000000 RBX: ffff8881c3065d00 RCX: 0000000000000000 [ 53.383690] RDX: 0000000000000000 RSI: ffffffff8165eaf5 RDI: 0000000000000005 [ 53.390952] RBP: ffff8881ccd26cd0 R08: ffff8881c10f4240 R09: 0000000000000006 [ 53.398223] R10: 0000000000000000 R11: ffff8881c10f4240 R12: ffff8881c3065d08 [ 53.405475] R13: 0000000000000000 R14: ffff8881ccd26c48 R15: ffff8881d1a02000 [ 53.412769] ? vprintk_func+0x85/0x181 [ 53.416655] ? trace_event_raw_event_block_rq_requeue+0x6d0/0x6d0 [ 53.422875] ? _raw_spin_unlock_irqrestore+0x6d/0xd0 [ 53.427967] ? depot_save_stack+0x292/0x470 [ 53.432278] ? __lock_acquire+0x62f/0x4c20 [ 53.436501] ? save_stack+0x43/0xd0 [ 53.440111] ? kasan_kmalloc+0xc7/0xe0 [ 53.443981] ? kasan_slab_alloc+0x12/0x20 [ 53.448115] ? kmem_cache_alloc+0x12e/0x730 [ 53.452422] ? mempool_alloc_slab+0x44/0x60 [ 53.456729] ? mempool_alloc+0x193/0x4a0 [ 53.460774] ? bio_alloc_bioset+0x3a8/0x700 [ 53.465109] ? submit_bh_wbc+0x14b/0x790 [ 53.469187] ? __block_write_full_page+0x93b/0x14a0 [ 53.474213] ? block_write_full_page+0x221/0x270 [ 53.478962] ? blkdev_writepage+0x24/0x30 [ 53.483109] ? mark_held_locks+0x130/0x130 [ 53.487351] ? ____fput+0x15/0x20 [ 53.490925] ? task_work_run+0x1e8/0x2a0 [ 53.494973] ? exit_to_usermode_loop+0x318/0x380 [ 53.499740] ? do_syscall_64+0x6be/0x820 [ 53.503797] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 53.509146] ? zap_class+0x640/0x640 [ 53.512840] ? trace_hardirqs_on+0xbd/0x310 [ 53.517191] ? zap_class+0x640/0x640 [ 53.520909] ? check_preemption_disabled+0x48/0x280 [ 53.525912] generic_make_request+0x2c7/0x18a0 [ 53.530474] ? blk_get_request+0x800/0x800 [ 53.534688] ? rcu_read_lock_sched_held+0x14f/0x180 [ 53.539702] ? zap_class+0x640/0x640 [ 53.543425] ? zap_class+0x640/0x640 [ 53.547135] ? mempool_alloc_slab+0x44/0x60 [ 53.551442] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 53.556975] ? check_preemption_disabled+0x48/0x280 [ 53.561987] ? find_held_lock+0x36/0x1c0 [ 53.566046] ? guard_bio_eod+0x1f4/0x630 [ 53.570090] ? lock_downgrade+0x900/0x900 [ 53.574217] ? check_preemption_disabled+0x48/0x280 [ 53.579234] submit_bio+0xba/0x460 [ 53.582755] ? submit_bio+0xba/0x460 [ 53.586450] ? rcu_softirq_qs+0x20/0x20 [ 53.590409] ? generic_make_request+0x18a0/0x18a0 [ 53.595235] ? __bio_add_page+0x134/0x290 [ 53.599370] ? __sanitizer_cov_trace_cmp8+0x18/0x20 [ 53.604384] ? guard_bio_eod+0x2bb/0x630 [ 53.608445] submit_bh_wbc+0x5de/0x790 [ 53.612320] __block_write_full_page+0x93b/0x14a0 [ 53.617147] ? I_BDEV+0x20/0x20 [ 53.620412] ? bh_uptodate_or_lock+0x160/0x160 [ 53.624979] ? submit_bh_wbc+0x790/0x790 [ 53.629024] ? trace_hardirqs_on+0xbd/0x310 [ 53.633338] ? tag_pages_for_writeback+0x5ff/0x7d0 [ 53.638263] ? zap_class+0x640/0x640 [ 53.641960] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 53.647477] ? check_preemption_disabled+0x48/0x280 [ 53.652479] block_write_full_page+0x221/0x270 [ 53.657042] ? I_BDEV+0x20/0x20 [ 53.660338] blkdev_writepage+0x24/0x30 [ 53.664296] __writepage+0x69/0xe0 [ 53.667822] write_cache_pages+0xc91/0x1e20 [ 53.672125] ? __wb_update_bandwidth+0x680/0x680 [ 53.676890] ? clear_page_dirty_for_io+0x1900/0x1900 [ 53.681986] ? __pagevec_lru_add+0x30/0x30 [ 53.686219] ? mark_held_locks+0x130/0x130 [ 53.690433] ? get_mem_cgroup_from_mm.part.62+0x204/0x880 [ 53.695985] ? mark_held_locks+0x130/0x130 [ 53.700215] ? rcu_softirq_qs+0x20/0x20 [ 53.704175] ? lock_acquire+0x1ed/0x520 [ 53.708128] ? __blkdev_put+0xc2/0x830 [ 53.711998] ? lock_release+0xa00/0xa00 [ 53.715955] ? perf_trace_sched_process_exec+0x860/0x860 [ 53.721392] ? lock_page_memcg+0x350/0x350 [ 53.725622] ? zap_class+0x640/0x640 [ 53.729325] ? __mutex_lock+0x85e/0x16f0 [ 53.733371] ? blk_start_plug+0xcc/0x370 [ 53.737417] ? find_held_lock+0x36/0x1c0 [ 53.741466] ? blk_lld_busy+0x70/0x70 [ 53.745255] ? wbc_attach_and_unlock_inode+0x5c0/0xa30 [ 53.750518] ? lock_downgrade+0x900/0x900 [ 53.754649] ? zap_class+0x640/0x640 [ 53.758343] ? kasan_check_read+0x11/0x20 [ 53.762472] generic_writepages+0xda/0x150 [ 53.766691] ? write_cache_pages+0x1e20/0x1e20 [ 53.771259] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 53.776782] blkdev_writepages+0x1d/0x30 [ 53.780844] ? blkdev_readpages+0x40/0x40 [ 53.784989] do_writepages+0x9a/0x1a0 [ 53.788794] __filemap_fdatawrite_range+0x364/0x4a0 [ 53.793797] ? delete_from_page_cache_batch+0x1640/0x1640 [ 53.799325] ? __mutex_unlock_slowpath+0x197/0x8c0 [ 53.804241] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 53.809762] ? locks_remove_posix+0x47d/0x840 [ 53.814243] ? blkdev_put+0x540/0x540 [ 53.818027] filemap_write_and_wait+0x44/0xc0 [ 53.822506] __blkdev_put+0x202/0x830 [ 53.826303] ? bd_set_size+0x370/0x370 [ 53.830173] ? ima_file_free+0x132/0x650 [ 53.834258] ? fsnotify_first_mark+0x350/0x350 [ 53.838844] ? blkdev_put+0x540/0x540 [ 53.842627] blkdev_put+0x98/0x540 [ 53.846156] ? blkdev_put+0x540/0x540 [ 53.849936] blkdev_close+0x8b/0xb0 [ 53.853563] __fput+0x385/0xa30 [ 53.856841] ? get_max_files+0x20/0x20 [ 53.860725] ? trace_hardirqs_on+0xbd/0x310 [ 53.865030] ? kasan_check_read+0x11/0x20 [ 53.869163] ? task_work_run+0x1af/0x2a0 [ 53.873216] ? trace_hardirqs_off_caller+0x310/0x310 [ 53.878308] ? filp_close+0x1cd/0x250 [ 53.882105] ____fput+0x15/0x20 [ 53.885379] task_work_run+0x1e8/0x2a0 [ 53.889277] ? task_work_cancel+0x240/0x240 [ 53.893591] ? copy_fd_bitmaps+0x210/0x210 [ 53.897806] ? do_syscall_64+0x9a/0x820 [ 53.901780] exit_to_usermode_loop+0x318/0x380 [ 53.906357] ? __bpf_trace_sys_exit+0x30/0x30 [ 53.910850] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 53.916375] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 53.921903] do_syscall_64+0x6be/0x820 [ 53.925805] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 53.931162] ? syscall_return_slowpath+0x5e0/0x5e0 [ 53.936088] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 53.940918] ? trace_hardirqs_on_caller+0x310/0x310 [ 53.945923] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 53.950927] ? prepare_exit_to_usermode+0x291/0x3b0 [ 53.955931] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 53.960761] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 53.965934] RIP: 0033:0x7efe7638e2b0 [ 53.969639] Code: 40 75 0b 31 c0 48 83 c4 08 e9 0c ff ff ff 48 8d 3d c5 32 08 00 e8 c0 07 02 00 83 3d 45 a3 2b 00 00 75 10 b8 03 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 31 c3 48 83 ec 08 e8 ce 8a 01 00 48 89 04 24 [ 53.988528] RSP: 002b:00007ffd712d34d8 EFLAGS: 00000246 ORIG_RAX: 0000000000000003 [ 53.996220] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007efe7638e2b0 [ 54.003587] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003 [ 54.010857] RBP: 0000000000000000 R08: 0000000000000028 R09: 0000000001680000 [ 54.018123] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000002062030 [ 54.025374] R13: 0000000000000000 R14: 0000000000000003 R15: 0000000000000005 [ 54.033693] Kernel Offset: disabled [ 54.037360] Rebooting in 86400 seconds..