[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 64.677456][ T27] audit: type=1800 audit(1576243179.168:25): pid=8889 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 64.697306][ T27] audit: type=1800 audit(1576243179.168:26): pid=8889 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 64.732073][ T27] audit: type=1800 audit(1576243179.178:27): pid=8889 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 '10.128.1.44' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 77.324836][ T27] kauditd_printk_skb: 3 callbacks suppressed [ 77.324848][ T27] audit: type=1804 audit(1576243191.818:31): pid=9041 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor969" name="/root/file0" dev="sda1" ino=16485 res=1 [ 77.355629][ T9041] ------------[ cut here ]------------ [ 77.361270][ T9041] generic_make_request: Trying to write to read-only block-device loop0 (partno 0) [ 77.371577][ T9041] WARNING: CPU: 0 PID: 9041 at block/blk-core.c:829 generic_make_request_checks+0x1c78/0x2190 [ 77.381842][ T9041] Kernel panic - not syncing: panic_on_warn set ... [ 77.388441][ T9041] CPU: 0 PID: 9041 Comm: syz-executor969 Not tainted 5.5.0-rc1-next-20191212-syzkaller #0 [ 77.398658][ T9041] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 77.408697][ T9041] Call Trace: [ 77.412174][ T9041] dump_stack+0x197/0x210 [ 77.416607][ T9041] ? generic_make_request_checks+0x1c60/0x2190 [ 77.422759][ T9041] panic+0x2e3/0x75c [ 77.426643][ T9041] ? add_taint.cold+0x16/0x16 [ 77.431327][ T9041] ? __kasan_check_write+0x14/0x20 [ 77.436424][ T9041] ? __warn.cold+0x14/0x3e [ 77.440846][ T9041] ? __warn+0xd9/0x1cf [ 77.444930][ T9041] ? generic_make_request_checks+0x1c78/0x2190 [ 77.451366][ T9041] __warn.cold+0x2f/0x3e [ 77.455615][ T9041] ? generic_make_request_checks+0x1c78/0x2190 [ 77.461778][ T9041] report_bug+0x289/0x300 [ 77.466105][ T9041] do_error_trap+0x11b/0x200 [ 77.470690][ T9041] do_invalid_op+0x37/0x50 [ 77.475192][ T9041] ? generic_make_request_checks+0x1c78/0x2190 [ 77.481349][ T9041] invalid_op+0x23/0x30 [ 77.485496][ T9041] RIP: 0010:generic_make_request_checks+0x1c78/0x2190 [ 77.492258][ T9041] 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 [ 77.511858][ T9041] RSP: 0018:ffffc90001e571c0 EFLAGS: 00010286 [ 77.517926][ T9041] RAX: 0000000000000000 RBX: ffff8880a21bd000 RCX: 0000000000000000 [ 77.525899][ T9041] RDX: 0000000000000000 RSI: ffffffff815e8b66 RDI: fffff520003cae2a [ 77.533886][ T9041] RBP: ffffc90001e572c0 R08: ffff8880972e40c0 R09: ffffed1015d06659 [ 77.541860][ T9041] R10: ffffed1015d06658 R11: ffff8880ae8332c7 R12: ffff88809f80e408 [ 77.549834][ T9041] R13: 0000000000000000 R14: 0000000000000001 R15: ffff88809f80e400 [ 77.557812][ T9041] ? vprintk_func+0x86/0x189 [ 77.562570][ T9041] ? __kasan_check_read+0x11/0x20 [ 77.567576][ T9041] ? mark_lock+0xc2/0x1220 [ 77.571983][ T9041] ? trace_event_raw_event_block_rq_requeue+0x640/0x640 [ 77.578985][ T9041] ? __lock_acquire+0x8a0/0x4a00 [ 77.583906][ T9041] ? __kasan_check_read+0x11/0x20 [ 77.588922][ T9041] ? __kasan_check_read+0x11/0x20 [ 77.593940][ T9041] generic_make_request+0x8f/0xb00 [ 77.599036][ T9041] ? __bio_associate_blkg.isra.0+0x2eb/0x700 [ 77.605005][ T9041] ? blk_queue_enter+0xe10/0xe10 [ 77.609929][ T9041] ? bio_associate_blkg_from_css+0x181/0x270 [ 77.615947][ T9041] ? find_held_lock+0x35/0x130 [ 77.620813][ T9041] submit_bio+0x113/0x600 [ 77.625147][ T9041] ? submit_bio+0x113/0x600 [ 77.629773][ T9041] ? generic_make_request+0xb00/0xb00 [ 77.635156][ T9041] ? __kasan_check_read+0x11/0x20 [ 77.640174][ T9041] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 77.645892][ T9041] submit_bh_wbc+0x6b6/0x900 [ 77.650477][ T9041] __block_write_full_page+0x7fe/0x11b0 [ 77.656531][ T9041] ? bdev_evict_inode+0x590/0x590 [ 77.661559][ T9041] ? block_commit_write+0x30/0x30 [ 77.666580][ T9041] block_write_full_page+0x21f/0x270 [ 77.671861][ T9041] ? bdev_evict_inode+0x590/0x590 [ 77.676877][ T9041] blkdev_writepage+0x25/0x30 [ 77.682256][ T9041] __writepage+0x66/0x110 [ 77.686659][ T9041] write_cache_pages+0x80c/0x13f0 [ 77.691682][ T9041] ? tag_pages_for_writeback+0x4b0/0x4b0 [ 77.697306][ T9041] ? clear_page_dirty_for_io+0xde0/0xde0 [ 77.702937][ T9041] ? mutex_destroy+0x6f/0x100 [ 77.707605][ T9041] ? lock_downgrade+0x920/0x920 [ 77.713143][ T9041] generic_writepages+0xed/0x160 [ 77.718419][ T9041] ? write_cache_pages+0x13f0/0x13f0 [ 77.723703][ T9041] ? wbc_attach_and_unlock_inode+0x4f5/0x9d0 [ 77.730833][ T9041] ? find_held_lock+0x35/0x130 [ 77.735612][ T9041] ? blkdev_readpages+0x40/0x40 [ 77.740476][ T9041] blkdev_writepages+0x1e/0x30 [ 77.745283][ T9041] do_writepages+0xfa/0x2a0 [ 77.749981][ T9041] ? page_writeback_cpu_online+0x20/0x20 [ 77.755612][ T9041] ? do_raw_spin_unlock+0x181/0x270 [ 77.761272][ T9041] ? _raw_spin_unlock+0x28/0x40 [ 77.766748][ T9041] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 77.773000][ T9041] ? wbc_attach_and_unlock_inode+0x617/0x9d0 [ 77.778970][ T9041] __filemap_fdatawrite_range+0x2bc/0x3b0 [ 77.784676][ T9041] ? delete_from_page_cache_batch+0xfe0/0xfe0 [ 77.790746][ T9041] ? lock_downgrade+0x920/0x920 [ 77.795856][ T9041] filemap_write_and_wait+0xf8/0x1e0 [ 77.801127][ T9041] __blkdev_put+0x204/0x810 [ 77.805644][ T9041] ? bd_set_size+0xb0/0xb0 [ 77.810055][ T9041] ? wait_for_completion+0x440/0x440 [ 77.815418][ T9041] blkdev_put+0x98/0x560 [ 77.819834][ T9041] blkdev_close+0x8b/0xb0 [ 77.824265][ T9041] __fput+0x2ff/0x890 [ 77.828248][ T9041] ? blkdev_put+0x560/0x560 [ 77.835443][ T9041] ____fput+0x16/0x20 [ 77.839433][ T9041] task_work_run+0x145/0x1c0 [ 77.844068][ T9041] do_exit+0x909/0x2f20 [ 77.848669][ T9041] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 77.854903][ T9041] ? mm_update_next_owner+0x7c0/0x7c0 [ 77.860517][ T9041] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 77.866487][ T9041] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 77.871930][ T9041] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 77.877376][ T9041] do_group_exit+0x135/0x360 [ 77.881968][ T9041] __x64_sys_exit_group+0x44/0x50 [ 77.886992][ T9041] do_syscall_64+0xfa/0x790 [ 77.891737][ T9041] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 77.897743][ T9041] RIP: 0033:0x442c38 [ 77.901650][ T9041] Code: 00 00 ea dc 40 00 00 00 00 00 c8 de 40 00 00 00 00 00 ea dc 40 00 00 00 00 00 ea dc 40 00 00 00 00 00 ea dc 40 00 00 00 00 00 dc 40 00 00 00 00 00 ea dc 40 00 00 00 00 00 ea dc 40 00 00 00 [ 77.921484][ T9041] RSP: 002b:00007fff1222bcd8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 77.930872][ T9041] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000442c38 [ 77.938838][ T9041] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 77.946814][ T9041] RBP: 00000000004c2548 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 77.954777][ T9041] R10: 00000000004002e0 R11: 0000000000000246 R12: 0000000000000001 [ 77.962734][ T9041] R13: 00000000006d41a0 R14: 0000000000000000 R15: 0000000000000000 [ 77.972181][ T9041] Kernel Offset: disabled [ 77.976567][ T9041] Rebooting in 86400 seconds..