[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 65.544691][ T27] audit: type=1800 audit(1574961631.396:25): pid=8707 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 65.566127][ T27] audit: type=1800 audit(1574961631.396:26): pid=8707 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 65.626609][ T27] audit: type=1800 audit(1574961631.406:27): pid=8707 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 '10.128.15.221' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 101.147230][ T27] kauditd_printk_skb: 3 callbacks suppressed [ 101.147242][ T27] audit: type=1804 audit(1574961666.996:31): pid=8861 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor964" name="/root/file0" dev="sda1" ino=2339 res=1 [ 101.181939][ T8861] ------------[ cut here ]------------ [ 101.189120][ T8861] generic_make_request: Trying to write to read-only block-device loop0 (partno 0) [ 101.200668][ T8861] WARNING: CPU: 1 PID: 8861 at block/blk-core.c:800 generic_make_request_checks+0x1c78/0x2190 [ 101.211563][ T8861] Kernel panic - not syncing: panic_on_warn set ... [ 101.218424][ T8861] CPU: 1 PID: 8861 Comm: syz-executor964 Not tainted 5.4.0-syzkaller #0 [ 101.226738][ T8861] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 101.236796][ T8861] Call Trace: [ 101.240171][ T8861] dump_stack+0x197/0x210 [ 101.244524][ T8861] ? generic_make_request_checks+0x1c60/0x2190 [ 101.250679][ T8861] panic+0x2e3/0x75c [ 101.254565][ T8861] ? add_taint.cold+0x16/0x16 [ 101.259258][ T8861] ? __kasan_check_write+0x14/0x20 [ 101.265336][ T8861] ? __warn.cold+0x14/0x3e [ 101.269742][ T8861] ? __warn+0xd9/0x1cf [ 101.273817][ T8861] ? generic_make_request_checks+0x1c78/0x2190 [ 101.279966][ T8861] __warn.cold+0x2f/0x3e [ 101.284196][ T8861] ? generic_make_request_checks+0x1c78/0x2190 [ 101.290420][ T8861] report_bug+0x289/0x300 [ 101.294733][ T8861] do_error_trap+0x11b/0x200 [ 101.299312][ T8861] do_invalid_op+0x37/0x50 [ 101.303892][ T8861] ? generic_make_request_checks+0x1c78/0x2190 [ 101.311632][ T8861] invalid_op+0x23/0x30 [ 101.316356][ T8861] RIP: 0010:generic_make_request_checks+0x1c78/0x2190 [ 101.323217][ T8861] Code: 00 00 44 8b ab 5c 05 00 00 48 8d b5 78 ff ff ff 4c 89 ff e8 5a 94 05 00 48 c7 c7 c0 47 05 88 48 89 c6 44 89 ea e8 a7 e4 0e fe <0f> 0b 48 b8 00 00 00 00 00 fc ff df 4c 89 e2 48 c1 ea 03 80 3c 02 [ 101.342814][ T8861] RSP: 0018:ffff8880965871c0 EFLAGS: 00010286 [ 101.348873][ T8861] RAX: 0000000000000000 RBX: ffff8880a3b4e000 RCX: 0000000000000000 [ 101.356829][ T8861] RDX: 0000000000000000 RSI: ffffffff815dc196 RDI: ffffed1012cb0e2a [ 101.365491][ T8861] RBP: ffff8880965872c0 R08: ffff8880a12904c0 R09: ffffed1015d26621 [ 101.374633][ T8861] R10: ffffed1015d26620 R11: ffff8880ae933107 R12: ffff8880a9a93908 [ 101.382596][ T8861] R13: 0000000000000000 R14: 0000000000000001 R15: ffff8880a9a93900 [ 101.390574][ T8861] ? vprintk_func+0x86/0x189 [ 101.395161][ T8861] ? trace_event_raw_event_block_rq_requeue+0x640/0x640 [ 101.402254][ T8861] ? __kasan_check_read+0x11/0x20 [ 101.407264][ T8861] ? __lock_acquire+0x8a0/0x4a00 [ 101.412188][ T8861] ? __kasan_check_read+0x11/0x20 [ 101.418730][ T8861] generic_make_request+0x8f/0xb50 [ 101.424024][ T8861] ? blk_queue_enter+0xe30/0xe30 [ 101.428968][ T8861] ? lock_downgrade+0x920/0x920 [ 101.433852][ T8861] submit_bio+0x113/0x600 [ 101.438169][ T8861] ? submit_bio+0x113/0x600 [ 101.443499][ T8861] ? generic_make_request+0xb50/0xb50 [ 101.448869][ T8861] ? bio_associate_blkg_from_css+0x4fd/0x980 [ 101.454837][ T8861] ? bio_reset+0x3a0/0x3a0 [ 101.459867][ T8861] ? __sanitizer_cov_trace_cmp8+0x18/0x20 [ 101.465954][ T8861] ? guard_bio_eod+0x28f/0x6c0 [ 101.470712][ T8861] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 101.476795][ T8861] submit_bh_wbc+0x6b6/0x900 [ 101.481377][ T8861] __block_write_full_page+0x7fe/0x11b0 [ 101.487009][ T8861] ? bdev_evict_inode+0x5c0/0x5c0 [ 101.492104][ T8861] ? __getblk_gfp+0xa10/0xa10 [ 101.496767][ T8861] block_write_full_page+0x21f/0x270 [ 101.502031][ T8861] ? bdev_evict_inode+0x5c0/0x5c0 [ 101.507215][ T8861] blkdev_writepage+0x25/0x30 [ 101.511967][ T8861] __writepage+0x66/0x110 [ 101.516302][ T8861] write_cache_pages+0x80c/0x13f0 [ 101.521501][ T8861] ? tag_pages_for_writeback+0x4b0/0x4b0 [ 101.527259][ T8861] ? clear_page_dirty_for_io+0xde0/0xde0 [ 101.532899][ T8861] ? lock_downgrade+0x920/0x920 [ 101.537774][ T8861] generic_writepages+0xed/0x160 [ 101.542842][ T8861] ? write_cache_pages+0x13f0/0x13f0 [ 101.548417][ T8861] ? wbc_attach_and_unlock_inode+0x515/0xa00 [ 101.554706][ T8861] ? find_held_lock+0x35/0x130 [ 101.560035][ T8861] ? blkdev_readpages+0x40/0x40 [ 101.565002][ T8861] blkdev_writepages+0x1e/0x30 [ 101.570108][ T8861] do_writepages+0xfa/0x2a0 [ 101.574743][ T8861] ? page_writeback_cpu_online+0x20/0x20 [ 101.580717][ T8861] ? do_raw_spin_unlock+0x178/0x270 [ 101.585948][ T8861] ? _raw_spin_unlock+0x28/0x40 [ 101.590795][ T8861] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 101.599253][ T8861] ? wbc_attach_and_unlock_inode+0x637/0xa00 [ 101.609479][ T8861] __filemap_fdatawrite_range+0x2bc/0x3b0 [ 101.615214][ T8861] ? delete_from_page_cache_batch+0xfe0/0xfe0 [ 101.621328][ T8861] ? lock_downgrade+0x920/0x920 [ 101.626171][ T8861] filemap_write_and_wait+0xf8/0x1e0 [ 101.631784][ T8861] __blkdev_put+0x204/0x810 [ 101.636289][ T8861] ? bd_set_size+0xb0/0xb0 [ 101.640708][ T8861] ? wait_for_completion+0x440/0x440 [ 101.646002][ T8861] blkdev_put+0x98/0x560 [ 101.650260][ T8861] blkdev_close+0x8b/0xb0 [ 101.654603][ T8861] __fput+0x2ff/0x890 [ 101.658851][ T8861] ? blkdev_put+0x560/0x560 [ 101.663607][ T8861] ____fput+0x16/0x20 [ 101.667936][ T8861] task_work_run+0x145/0x1c0 [ 101.672515][ T8861] do_exit+0x8e7/0x2e00 [ 101.677540][ T8861] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 101.683799][ T8861] ? mm_update_next_owner+0x7c0/0x7c0 [ 101.689220][ T8861] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 101.694867][ T8861] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 101.700842][ T8861] do_group_exit+0x135/0x360 [ 101.705932][ T8861] __x64_sys_exit_group+0x44/0x50 [ 101.710951][ T8861] do_syscall_64+0xfa/0x790 [ 101.715468][ T8861] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 101.722505][ T8861] RIP: 0033:0x442c38 [ 101.726397][ T8861] 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 [ 101.746471][ T8861] RSP: 002b:00007ffd6074a488 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 101.755004][ T8861] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000442c38 [ 101.763091][ T8861] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 101.771158][ T8861] RBP: 00000000004c2548 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 101.780294][ T8861] R10: 00000000004002e0 R11: 0000000000000246 R12: 0000000000000001 [ 101.788413][ T8861] R13: 00000000006d41a0 R14: 0000000000000000 R15: 0000000000000000 [ 101.798251][ T8861] Kernel Offset: disabled [ 101.802748][ T8861] Rebooting in 86400 seconds..