[....] 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. [ 30.910038] kauditd_printk_skb: 8 callbacks suppressed [ 30.910050] audit: type=1800 audit(1543244550.459:29): pid=6026 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 [ 30.935496] audit: type=1800 audit(1543244550.459:30): pid=6026 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: [ 32.332963] sshd (6166) used greatest stack depth: 15744 bytes left Warning: Permanently added '10.128.0.19' (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 [ 39.345519] ------------[ cut here ]------------ [ 39.350539] generic_make_request: Trying to write to read-only block-device loop0 (partno 0) [ 39.403468] WARNING: CPU: 0 PID: 6196 at block/blk-core.c:2170 generic_make_request_checks+0xef9/0x26c0 [ 39.413038] Kernel panic - not syncing: panic_on_warn set ... [ 39.418940] CPU: 0 PID: 6196 Comm: syz-executor141 Not tainted 4.20.0-rc4+ #350 [ 39.426386] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 39.435749] Call Trace: [ 39.438348] dump_stack+0x244/0x39d [ 39.441989] ? dump_stack_print_info.cold.1+0x20/0x20 [ 39.447205] panic+0x2ad/0x55c [ 39.450412] ? add_taint.cold.5+0x16/0x16 [ 39.454578] ? __warn.cold.8+0x5/0x45 [ 39.458391] ? __warn+0xe8/0x1d0 [ 39.461774] ? generic_make_request_checks+0xef9/0x26c0 [ 39.467146] __warn.cold.8+0x20/0x45 [ 39.470865] ? rcu_softirq_qs+0x20/0x20 [ 39.474851] ? generic_make_request_checks+0xef9/0x26c0 [ 39.480214] report_bug+0x254/0x2d0 [ 39.483831] do_error_trap+0x11b/0x200 [ 39.487709] do_invalid_op+0x36/0x40 [ 39.491405] ? generic_make_request_checks+0xef9/0x26c0 [ 39.496770] invalid_op+0x14/0x20 [ 39.500236] RIP: 0010:generic_make_request_checks+0xef9/0x26c0 [ 39.506219] 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 20 2b 5f 88 48 89 c6 44 89 ea e8 57 d0 cf fd <0f> 0b e9 c1 f4 ff ff e8 fb 6f 06 fe e8 a6 47 f0 fd e8 f1 6f 06 fe [ 39.525125] RSP: 0018:ffff8881c9dfe010 EFLAGS: 00010286 [ 39.530494] RAX: 0000000000000000 RBX: ffff8881bc67e040 RCX: 0000000000000000 [ 39.537766] RDX: 0000000000000000 RSI: ffffffff8165eaf5 RDI: 0000000000000005 [ 39.545039] RBP: ffff8881c9dfe310 R08: ffff8881b94f4340 R09: ffffed103b5c5020 [ 39.552325] R10: ffffed103b5c5020 R11: ffff8881dae28107 R12: ffff8881bc67e048 [ 39.559600] R13: 0000000000000000 R14: ffff8881c9dfe288 R15: ffff8881d194c000 [ 39.566905] ? vprintk_func+0x85/0x181 [ 39.570799] ? trace_event_raw_event_block_rq_requeue+0x6d0/0x6d0 [ 39.577039] ? _raw_spin_unlock_irqrestore+0x6d/0xd0 [ 39.582128] ? depot_save_stack+0x292/0x470 [ 39.586437] ? __lock_acquire+0x62f/0x4c20 [ 39.590691] ? save_stack+0x43/0xd0 [ 39.594310] ? kasan_kmalloc+0xc7/0xe0 [ 39.598191] ? kasan_slab_alloc+0x12/0x20 [ 39.602337] ? kmem_cache_alloc+0x12e/0x730 [ 39.606673] ? mempool_alloc_slab+0x44/0x60 [ 39.610979] ? mempool_alloc+0x193/0x4a0 [ 39.615053] ? bio_alloc_bioset+0x3a8/0x700 [ 39.619378] ? submit_bh_wbc+0x14b/0x790 [ 39.623437] ? __block_write_full_page+0x93b/0x14a0 [ 39.628454] ? block_write_full_page+0x221/0x270 [ 39.633200] ? blkdev_writepage+0x24/0x30 [ 39.637370] ? mark_held_locks+0x130/0x130 [ 39.641593] ? ____fput+0x15/0x20 [ 39.645031] ? task_work_run+0x1e8/0x2a0 [ 39.649090] ? do_exit+0x1ad6/0x26d0 [ 39.652803] ? do_group_exit+0x177/0x440 [ 39.656856] ? get_signal+0x8b0/0x1980 [ 39.660749] ? do_signal+0x9c/0x21c0 [ 39.664462] ? exit_to_usermode_loop+0x2e5/0x380 [ 39.669201] ? do_syscall_64+0x6be/0x820 [ 39.673250] ? zap_class+0x640/0x640 [ 39.676956] ? check_preemption_disabled+0x48/0x280 [ 39.681960] generic_make_request+0x2c7/0x18a0 [ 39.686531] ? blk_get_request+0x800/0x800 [ 39.690779] ? rcu_read_lock_sched_held+0x14f/0x180 [ 39.695805] ? zap_class+0x640/0x640 [ 39.699515] ? zap_class+0x640/0x640 [ 39.703223] ? mempool_alloc_slab+0x44/0x60 [ 39.707561] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 39.713121] ? check_preemption_disabled+0x48/0x280 [ 39.718165] ? find_held_lock+0x36/0x1c0 [ 39.722248] ? guard_bio_eod+0x1f4/0x630 [ 39.726316] ? lock_downgrade+0x900/0x900 [ 39.730484] ? check_preemption_disabled+0x48/0x280 [ 39.735539] submit_bio+0xba/0x460 [ 39.739107] ? submit_bio+0xba/0x460 [ 39.742826] ? rcu_softirq_qs+0x20/0x20 [ 39.746821] ? generic_make_request+0x18a0/0x18a0 [ 39.751692] ? __bio_add_page+0x134/0x290 [ 39.755856] ? __sanitizer_cov_trace_cmp8+0x18/0x20 [ 39.760883] ? guard_bio_eod+0x2bb/0x630 [ 39.764959] submit_bh_wbc+0x5de/0x790 [ 39.768870] __block_write_full_page+0x93b/0x14a0 [ 39.773726] ? I_BDEV+0x20/0x20 [ 39.777011] ? bh_uptodate_or_lock+0x160/0x160 [ 39.781609] ? submit_bh_wbc+0x790/0x790 [ 39.785685] ? trace_hardirqs_on+0xbd/0x310 [ 39.789994] ? tag_pages_for_writeback+0x5ff/0x7d0 [ 39.794915] ? zap_class+0x640/0x640 [ 39.798618] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 39.804149] ? check_preemption_disabled+0x48/0x280 [ 39.809176] block_write_full_page+0x221/0x270 [ 39.813757] ? I_BDEV+0x20/0x20 [ 39.817035] blkdev_writepage+0x24/0x30 [ 39.820997] __writepage+0x69/0xe0 [ 39.824526] write_cache_pages+0xc91/0x1e20 [ 39.828868] ? __wb_update_bandwidth+0x680/0x680 [ 39.833618] ? clear_page_dirty_for_io+0x1900/0x1900 [ 39.838744] ? print_usage_bug+0xc0/0xc0 [ 39.842804] ? mark_held_locks+0x130/0x130 [ 39.847031] ? mark_held_locks+0x130/0x130 [ 39.851259] ? zap_class+0x640/0x640 [ 39.854967] ? zap_class+0x640/0x640 [ 39.858671] ? lock_acquire+0x1ed/0x520 [ 39.862644] ? __blkdev_put+0xc2/0x830 [ 39.866552] ? lock_release+0xa00/0xa00 [ 39.870514] ? perf_trace_sched_process_exec+0x860/0x860 [ 39.875967] ? zap_class+0x640/0x640 [ 39.879686] ? __mutex_lock+0x85e/0x16f0 [ 39.883751] ? blk_start_plug+0xcc/0x370 [ 39.887795] ? find_held_lock+0x36/0x1c0 [ 39.891851] ? blk_lld_busy+0x70/0x70 [ 39.895664] ? lock_downgrade+0x900/0x900 [ 39.899808] ? zap_class+0x640/0x640 [ 39.903512] ? kasan_check_read+0x11/0x20 [ 39.907671] generic_writepages+0xda/0x150 [ 39.911907] ? write_cache_pages+0x1e20/0x1e20 [ 39.916476] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 39.921998] blkdev_writepages+0x1d/0x30 [ 39.926049] ? blkdev_readpages+0x40/0x40 [ 39.930182] do_writepages+0x9a/0x1a0 [ 39.933978] __filemap_fdatawrite_range+0x364/0x4a0 [ 39.938992] ? delete_from_page_cache_batch+0x1640/0x1640 [ 39.944555] ? __mutex_unlock_slowpath+0x197/0x8c0 [ 39.949485] filemap_write_and_wait+0x44/0xc0 [ 39.953965] __blkdev_put+0x202/0x830 [ 39.957772] ? bd_set_size+0x370/0x370 [ 39.961662] ? do_raw_spin_trylock+0x270/0x270 [ 39.966233] ? fsnotify_first_mark+0x350/0x350 [ 39.970820] blkdev_put+0x98/0x540 [ 39.974345] ? blkdev_put+0x540/0x540 [ 39.978142] blkdev_close+0x8b/0xb0 [ 39.981819] __fput+0x385/0xa30 [ 39.985126] ? get_max_files+0x20/0x20 [ 39.989026] ? trace_hardirqs_on+0xbd/0x310 [ 39.993358] ? kasan_check_read+0x11/0x20 [ 39.997499] ? task_work_run+0x1af/0x2a0 [ 40.001575] ? trace_hardirqs_off_caller+0x310/0x310 [ 40.006706] ____fput+0x15/0x20 [ 40.009985] task_work_run+0x1e8/0x2a0 [ 40.013862] ? task_work_cancel+0x240/0x240 [ 40.018182] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 40.023718] ? switch_task_namespaces+0x9d/0xd0 [ 40.028391] do_exit+0x1ad6/0x26d0 [ 40.031937] ? _raw_spin_unlock_irqrestore+0x82/0xd0 [ 40.037035] ? mm_update_next_owner+0x990/0x990 [ 40.041707] ? print_usage_bug+0xc0/0xc0 [ 40.045759] ? __lock_acquire+0x62f/0x4c20 [ 40.050018] ? debug_object_active_state+0x2f5/0x4d0 [ 40.055116] ? _raw_spin_unlock_irqrestore+0x82/0xd0 [ 40.060206] ? _raw_spin_unlock_irqrestore+0x82/0xd0 [ 40.065311] ? __lock_acquire+0x62f/0x4c20 [ 40.069542] ? trace_hardirqs_off+0xb8/0x310 [ 40.073963] ? kasan_check_read+0x11/0x20 [ 40.078118] ? mark_held_locks+0x130/0x130 [ 40.082338] ? rcu_dynticks_curr_cpu_in_eqs+0xa2/0x170 [ 40.087619] ? debug_object_deactivate+0x450/0x450 [ 40.092553] ? call_rcu+0xb/0x10 [ 40.095907] ? trace_hardirqs_off_caller+0x310/0x310 [ 40.100994] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 40.106518] ? check_preemption_disabled+0x48/0x280 [ 40.111520] ? lockdep_hardirqs_on+0x3bb/0x5b0 [ 40.116092] ? trace_hardirqs_off_caller+0x310/0x310 [ 40.121193] ? rcu_is_watching+0x30/0x30 [ 40.125269] ? zap_class+0x640/0x640 [ 40.128981] ? kzfree+0x28/0x30 [ 40.132267] ? kzfree+0x28/0x30 [ 40.135553] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 40.141113] ? zap_class+0x640/0x640 [ 40.144822] ? find_held_lock+0x36/0x1c0 [ 40.148873] ? memset+0x31/0x40 [ 40.152144] ? find_held_lock+0x36/0x1c0 [ 40.156192] ? get_signal+0x95b/0x1980 [ 40.160065] ? _raw_spin_unlock_irq+0x27/0x80 [ 40.164555] ? _raw_spin_unlock_irq+0x27/0x80 [ 40.169072] do_group_exit+0x177/0x440 [ 40.172957] ? trace_hardirqs_off_caller+0x310/0x310 [ 40.178055] ? __ia32_sys_exit+0x50/0x50 [ 40.182130] get_signal+0x8b0/0x1980 [ 40.185853] ? ptrace_notify+0x130/0x130 [ 40.189905] ? pipe_read+0x702/0x940 [ 40.193620] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 40.199167] ? __vfs_read+0x11f/0x9b0 [ 40.202969] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 40.208532] do_signal+0x9c/0x21c0 [ 40.212071] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 40.217602] ? check_preemption_disabled+0x48/0x280 [ 40.222622] ? setup_sigcontext+0x7d0/0x7d0 [ 40.226961] ? task_work_add+0x123/0x1e0 [ 40.231019] ? exit_to_usermode_loop+0x8c/0x380 [ 40.235682] ? exit_to_usermode_loop+0x8c/0x380 [ 40.240335] ? lockdep_hardirqs_on+0x3bb/0x5b0 [ 40.244903] ? trace_hardirqs_on+0xbd/0x310 [ 40.249209] ? do_syscall_64+0x6be/0x820 [ 40.253259] ? fput+0x130/0x1a0 [ 40.256529] exit_to_usermode_loop+0x2e5/0x380 [ 40.261098] ? __bpf_trace_sys_exit+0x30/0x30 [ 40.265600] do_syscall_64+0x6be/0x820 [ 40.269472] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 40.274841] ? syscall_return_slowpath+0x5e0/0x5e0 [ 40.279771] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 40.284599] ? trace_hardirqs_on_caller+0x310/0x310 [ 40.289602] ? prepare_exit_to_usermode+0x291/0x3b0 [ 40.294617] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 40.299470] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 40.304658] RIP: 0033:0x44a4f9 [ 40.307854] Code: e8 0c e8 ff ff 48 83 c4 18 c3 0f 1f 80 00 00 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 9b cc fb ff c3 66 2e 0f 1f 84 00 00 00 00 [ 40.326774] RSP: 002b:00007f80b2cedce8 EFLAGS: 00000206 ORIG_RAX: 0000000000000000 [ 40.334475] RAX: 0000000000f80000 RBX: 00000000006dbc68 RCX: 000000000044a4f9 [ 40.341738] RDX: 0000000050c7e3e3 RSI: 0000000020000200 RDI: 0000000000000009 [ 40.349021] RBP: 00000000006dbc60 R08: 0000000000000000 R09: 0000000000000000 [ 40.356272] R10: 0000000000000000 R11: 0000000000000206 R12: 00000000006dbc6c [ 40.363525] R13: 00007ffccf970dff R14: 00007f80b2cee9c0 R15: 00000000006dbd6c [ 40.372312] Kernel Offset: disabled [ 40.375978] Rebooting in 86400 seconds..