[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 61.477762][ T27] audit: type=1800 audit(1576241551.393:25): pid=8975 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 61.513578][ T27] audit: type=1800 audit(1576241551.393:26): pid=8975 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 61.535009][ T27] audit: type=1800 audit(1576241551.393:27): pid=8975 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2436 res=0 [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.10.0' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 73.687250][ T27] kauditd_printk_skb: 3 callbacks suppressed [ 73.687263][ T27] audit: type=1804 audit(1576241563.603:31): pid=9128 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor115" name="/root/file0" dev="sda1" ino=16484 res=1 [ 73.717186][ T9128] ------------[ cut here ]------------ [ 73.722726][ T9128] generic_make_request: Trying to write to read-only block-device loop0 (partno 0) [ 73.732833][ T9128] WARNING: CPU: 0 PID: 9128 at block/blk-core.c:829 generic_make_request_checks+0x1c78/0x2190 [ 73.743067][ T9128] Kernel panic - not syncing: panic_on_warn set ... [ 73.749636][ T9128] CPU: 0 PID: 9128 Comm: syz-executor115 Not tainted 5.5.0-rc1-next-20191212-syzkaller #0 [ 73.759842][ T9128] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 73.769876][ T9128] Call Trace: [ 73.773146][ T9128] dump_stack+0x197/0x210 [ 73.777461][ T9128] ? generic_make_request_checks+0x1c60/0x2190 [ 73.783615][ T9128] panic+0x2e3/0x75c [ 73.787491][ T9128] ? add_taint.cold+0x16/0x16 [ 73.792150][ T9128] ? __kasan_check_write+0x14/0x20 [ 73.797240][ T9128] ? __warn.cold+0x14/0x3e [ 73.801672][ T9128] ? __warn+0xd9/0x1cf [ 73.805726][ T9128] ? generic_make_request_checks+0x1c78/0x2190 [ 73.811881][ T9128] __warn.cold+0x2f/0x3e [ 73.816119][ T9128] ? generic_make_request_checks+0x1c78/0x2190 [ 73.822255][ T9128] report_bug+0x289/0x300 [ 73.826566][ T9128] do_error_trap+0x11b/0x200 [ 73.831135][ T9128] do_invalid_op+0x37/0x50 [ 73.835535][ T9128] ? generic_make_request_checks+0x1c78/0x2190 [ 73.841680][ T9128] invalid_op+0x23/0x30 [ 73.845830][ T9128] RIP: 0010:generic_make_request_checks+0x1c78/0x2190 [ 73.852668][ T9128] Code: 00 00 44 8b ab 5c 05 00 00 48 8d b5 78 ff ff ff 4c 89 ff e8 7a 97 05 00 48 c7 c7 00 2e 6e 88 48 89 c6 44 89 ea e8 f7 7a ca fd <0f> 0b 48 b8 00 00 00 00 00 fc ff df 4c 89 e2 48 c1 ea 03 80 3c 02 [ 73.872351][ T9128] RSP: 0018:ffffc90001e371c0 EFLAGS: 00010286 [ 73.878394][ T9128] RAX: 0000000000000000 RBX: ffff8880a212f000 RCX: 0000000000000000 [ 73.886344][ T9128] RDX: 0000000000000000 RSI: ffffffff815e8b66 RDI: fffff520003c6e2a [ 73.894292][ T9128] RBP: ffffc90001e372c0 R08: ffff8880984ea4c0 R09: ffffed1015d06659 [ 73.902258][ T9128] R10: ffffed1015d06658 R11: ffff8880ae8332c7 R12: ffff8880a9475b08 [ 73.910221][ T9128] R13: 0000000000000000 R14: 0000000000000001 R15: ffff8880a9475b00 [ 73.918201][ T9128] ? vprintk_func+0x86/0x189 [ 73.922787][ T9128] ? __kasan_check_read+0x11/0x20 [ 73.927791][ T9128] ? mark_lock+0xc2/0x1220 [ 73.932191][ T9128] ? trace_event_raw_event_block_rq_requeue+0x640/0x640 [ 73.939104][ T9128] ? __lock_acquire+0x8a0/0x4a00 [ 73.944021][ T9128] ? __kasan_check_read+0x11/0x20 [ 73.949024][ T9128] ? __kasan_check_read+0x11/0x20 [ 73.954031][ T9128] generic_make_request+0x8f/0xb00 [ 73.959135][ T9128] ? __bio_associate_blkg.isra.0+0x2eb/0x700 [ 73.965097][ T9128] ? blk_queue_enter+0xe10/0xe10 [ 73.970016][ T9128] ? bio_associate_blkg_from_css+0x181/0x270 [ 73.975977][ T9128] ? find_held_lock+0x35/0x130 [ 73.980740][ T9128] submit_bio+0x113/0x600 [ 73.985062][ T9128] ? submit_bio+0x113/0x600 [ 73.989552][ T9128] ? generic_make_request+0xb00/0xb00 [ 73.994905][ T9128] ? __kasan_check_read+0x11/0x20 [ 73.999909][ T9128] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 74.006218][ T9128] submit_bh_wbc+0x6b6/0x900 [ 74.011190][ T9128] __block_write_full_page+0x7fe/0x11b0 [ 74.016872][ T9128] ? bdev_evict_inode+0x590/0x590 [ 74.021920][ T9128] ? block_commit_write+0x30/0x30 [ 74.026933][ T9128] block_write_full_page+0x21f/0x270 [ 74.032199][ T9128] ? bdev_evict_inode+0x590/0x590 [ 74.037204][ T9128] blkdev_writepage+0x25/0x30 [ 74.041862][ T9128] __writepage+0x66/0x110 [ 74.046171][ T9128] write_cache_pages+0x80c/0x13f0 [ 74.051183][ T9128] ? tag_pages_for_writeback+0x4b0/0x4b0 [ 74.056840][ T9128] ? clear_page_dirty_for_io+0xde0/0xde0 [ 74.062498][ T9128] ? mutex_destroy+0x6f/0x100 [ 74.067209][ T9128] ? lock_downgrade+0x920/0x920 [ 74.072039][ T9128] generic_writepages+0xed/0x160 [ 74.076953][ T9128] ? write_cache_pages+0x13f0/0x13f0 [ 74.082219][ T9128] ? wbc_attach_and_unlock_inode+0x4f5/0x9d0 [ 74.088178][ T9128] ? find_held_lock+0x35/0x130 [ 74.092920][ T9128] ? blkdev_readpages+0x40/0x40 [ 74.097747][ T9128] blkdev_writepages+0x1e/0x30 [ 74.102487][ T9128] do_writepages+0xfa/0x2a0 [ 74.106968][ T9128] ? page_writeback_cpu_online+0x20/0x20 [ 74.112596][ T9128] ? do_raw_spin_unlock+0x181/0x270 [ 74.117787][ T9128] ? _raw_spin_unlock+0x28/0x40 [ 74.122621][ T9128] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 74.128844][ T9128] ? wbc_attach_and_unlock_inode+0x617/0x9d0 [ 74.134808][ T9128] __filemap_fdatawrite_range+0x2bc/0x3b0 [ 74.140556][ T9128] ? delete_from_page_cache_batch+0xfe0/0xfe0 [ 74.146607][ T9128] ? lock_downgrade+0x920/0x920 [ 74.151441][ T9128] filemap_write_and_wait+0xf8/0x1e0 [ 74.156706][ T9128] __blkdev_put+0x204/0x810 [ 74.161208][ T9128] ? bd_set_size+0xb0/0xb0 [ 74.165658][ T9128] ? wait_for_completion+0x440/0x440 [ 74.170938][ T9128] blkdev_put+0x98/0x560 [ 74.175203][ T9128] blkdev_close+0x8b/0xb0 [ 74.179514][ T9128] __fput+0x2ff/0x890 [ 74.183473][ T9128] ? blkdev_put+0x560/0x560 [ 74.187956][ T9128] ____fput+0x16/0x20 [ 74.191921][ T9128] task_work_run+0x145/0x1c0 [ 74.196496][ T9128] do_exit+0x909/0x2f20 [ 74.200632][ T9128] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 74.206856][ T9128] ? mm_update_next_owner+0x7c0/0x7c0 [ 74.212203][ T9128] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 74.218167][ T9128] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 74.223603][ T9128] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 74.229051][ T9128] do_group_exit+0x135/0x360 [ 74.233623][ T9128] __x64_sys_exit_group+0x44/0x50 [ 74.238626][ T9128] do_syscall_64+0xfa/0x790 [ 74.243108][ T9128] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 74.249032][ T9128] RIP: 0033:0x442c38 [ 74.252929][ T9128] Code: Bad RIP value. [ 74.256987][ T9128] RSP: 002b:00007ffed600cd08 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 74.265382][ T9128] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000442c38 [ 74.273353][ T9128] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 74.281318][ T9128] RBP: 00000000004c2548 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 74.289270][ T9128] R10: 00000000004002e0 R11: 0000000000000246 R12: 0000000000000001 [ 74.297227][ T9128] R13: 00000000006d41a0 R14: 0000000000000000 R15: 0000000000000000 [ 74.306691][ T9128] Kernel Offset: disabled [ 74.311081][ T9128] Rebooting in 86400 seconds..