[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 55.496797][ T26] audit: type=1800 audit(1574957841.584:25): pid=8721 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 55.516666][ T26] audit: type=1800 audit(1574957841.584:26): pid=8721 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 55.552400][ T26] audit: type=1800 audit(1574957841.584:27): pid=8721 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 '10.128.1.0' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 81.949419][ T26] kauditd_printk_skb: 3 callbacks suppressed [ 81.949431][ T26] audit: type=1804 audit(1574957868.034:31): pid=8873 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor221" name="/root/file0" dev="sda1" ino=1426 res=1 [ 81.983886][ T8873] ------------[ cut here ]------------ [ 81.990074][ T8873] generic_make_request: Trying to write to read-only block-device loop0 (partno 0) [ 82.000244][ T8873] WARNING: CPU: 0 PID: 8873 at block/blk-core.c:800 generic_make_request_checks+0x1c78/0x2190 [ 82.010518][ T8873] Kernel panic - not syncing: panic_on_warn set ... [ 82.017112][ T8873] CPU: 0 PID: 8873 Comm: syz-executor221 Not tainted 5.4.0-syzkaller #0 [ 82.025415][ T8873] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 82.035466][ T8873] Call Trace: [ 82.038756][ T8873] dump_stack+0x197/0x210 [ 82.043075][ T8873] ? generic_make_request_checks+0x1c60/0x2190 [ 82.049228][ T8873] panic+0x2e3/0x75c [ 82.053120][ T8873] ? add_taint.cold+0x16/0x16 [ 82.057797][ T8873] ? __kasan_check_write+0x14/0x20 [ 82.062897][ T8873] ? __warn.cold+0x14/0x3e [ 82.067318][ T8873] ? __warn+0xd9/0x1cf [ 82.071420][ T8873] ? generic_make_request_checks+0x1c78/0x2190 [ 82.077577][ T8873] __warn.cold+0x2f/0x3e [ 82.081816][ T8873] ? generic_make_request_checks+0x1c78/0x2190 [ 82.087959][ T8873] report_bug+0x289/0x300 [ 82.092284][ T8873] do_error_trap+0x11b/0x200 [ 82.096861][ T8873] do_invalid_op+0x37/0x50 [ 82.101277][ T8873] ? generic_make_request_checks+0x1c78/0x2190 [ 82.107429][ T8873] invalid_op+0x23/0x30 [ 82.111582][ T8873] RIP: 0010:generic_make_request_checks+0x1c78/0x2190 [ 82.118329][ T8873] 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 [ 82.138279][ T8873] RSP: 0018:ffff888093b1f1c0 EFLAGS: 00010286 [ 82.144337][ T8873] RAX: 0000000000000000 RBX: ffff8880a3b12000 RCX: 0000000000000000 [ 82.152292][ T8873] RDX: 0000000000000000 RSI: ffffffff815dc196 RDI: ffffed1012763e2a [ 82.160250][ T8873] RBP: ffff888093b1f2c0 R08: ffff88809a0be100 R09: ffffed1015d06621 [ 82.168219][ T8873] R10: ffffed1015d06620 R11: ffff8880ae833107 R12: ffff8880a1de0f08 [ 82.176179][ T8873] R13: 0000000000000000 R14: 0000000000000001 R15: ffff8880a1de0f00 [ 82.184165][ T8873] ? vprintk_func+0x86/0x189 [ 82.188843][ T8873] ? trace_event_raw_event_block_rq_requeue+0x640/0x640 [ 82.195777][ T8873] ? __kasan_check_read+0x11/0x20 [ 82.200789][ T8873] ? __lock_acquire+0x8a0/0x4a00 [ 82.205710][ T8873] ? __kasan_check_read+0x11/0x20 [ 82.210732][ T8873] generic_make_request+0x8f/0xb50 [ 82.215830][ T8873] ? blk_queue_enter+0xe30/0xe30 [ 82.220759][ T8873] ? lock_downgrade+0x920/0x920 [ 82.225611][ T8873] submit_bio+0x113/0x600 [ 82.229925][ T8873] ? submit_bio+0x113/0x600 [ 82.234445][ T8873] ? generic_make_request+0xb50/0xb50 [ 82.239827][ T8873] ? bio_associate_blkg_from_css+0x4fd/0x980 [ 82.245799][ T8873] ? bio_reset+0x3a0/0x3a0 [ 82.250216][ T8873] ? __sanitizer_cov_trace_cmp8+0x18/0x20 [ 82.256076][ T8873] ? guard_bio_eod+0x28f/0x6c0 [ 82.260853][ T8873] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 82.266603][ T8873] submit_bh_wbc+0x6b6/0x900 [ 82.271193][ T8873] __block_write_full_page+0x7fe/0x11b0 [ 82.276726][ T8873] ? bdev_evict_inode+0x5c0/0x5c0 [ 82.281757][ T8873] ? __getblk_gfp+0xa10/0xa10 [ 82.286445][ T8873] block_write_full_page+0x21f/0x270 [ 82.291811][ T8873] ? bdev_evict_inode+0x5c0/0x5c0 [ 82.296841][ T8873] blkdev_writepage+0x25/0x30 [ 82.301503][ T8873] __writepage+0x66/0x110 [ 82.305830][ T8873] write_cache_pages+0x80c/0x13f0 [ 82.310845][ T8873] ? tag_pages_for_writeback+0x4b0/0x4b0 [ 82.316478][ T8873] ? clear_page_dirty_for_io+0xde0/0xde0 [ 82.322098][ T8873] ? lock_downgrade+0x920/0x920 [ 82.326956][ T8873] generic_writepages+0xed/0x160 [ 82.331887][ T8873] ? write_cache_pages+0x13f0/0x13f0 [ 82.337164][ T8873] ? wbc_attach_and_unlock_inode+0x515/0xa00 [ 82.343133][ T8873] ? find_held_lock+0x35/0x130 [ 82.347887][ T8873] ? blkdev_readpages+0x40/0x40 [ 82.352727][ T8873] blkdev_writepages+0x1e/0x30 [ 82.357502][ T8873] do_writepages+0xfa/0x2a0 [ 82.362005][ T8873] ? page_writeback_cpu_online+0x20/0x20 [ 82.367630][ T8873] ? do_raw_spin_unlock+0x178/0x270 [ 82.372819][ T8873] ? _raw_spin_unlock+0x28/0x40 [ 82.377655][ T8873] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 82.383885][ T8873] ? wbc_attach_and_unlock_inode+0x637/0xa00 [ 82.389858][ T8873] __filemap_fdatawrite_range+0x2bc/0x3b0 [ 82.395567][ T8873] ? delete_from_page_cache_batch+0xfe0/0xfe0 [ 82.401631][ T8873] ? lock_downgrade+0x920/0x920 [ 82.406489][ T8873] filemap_write_and_wait+0xf8/0x1e0 [ 82.411772][ T8873] __blkdev_put+0x204/0x810 [ 82.416290][ T8873] ? bd_set_size+0xb0/0xb0 [ 82.420784][ T8873] ? wait_for_completion+0x440/0x440 [ 82.426084][ T8873] blkdev_put+0x98/0x560 [ 82.430322][ T8873] blkdev_close+0x8b/0xb0 [ 82.434646][ T8873] __fput+0x2ff/0x890 [ 82.438634][ T8873] ? blkdev_put+0x560/0x560 [ 82.443128][ T8873] ____fput+0x16/0x20 [ 82.447097][ T8873] task_work_run+0x145/0x1c0 [ 82.451852][ T8873] do_exit+0x8e7/0x2e00 [ 82.456008][ T8873] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 82.462245][ T8873] ? mm_update_next_owner+0x7c0/0x7c0 [ 82.467609][ T8873] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 82.473579][ T8873] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 82.479026][ T8873] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 82.484473][ T8873] do_group_exit+0x135/0x360 [ 82.489071][ T8873] __x64_sys_exit_group+0x44/0x50 [ 82.494105][ T8873] do_syscall_64+0xfa/0x790 [ 82.498628][ T8873] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 82.504515][ T8873] RIP: 0033:0x442c38 [ 82.508412][ T8873] 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 [ 82.528016][ T8873] RSP: 002b:00007ffd255c6678 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 82.536502][ T8873] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000442c38 [ 82.544474][ T8873] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 82.552900][ T8873] RBP: 00000000004c2548 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 82.560991][ T8873] R10: 00000000004002e0 R11: 0000000000000246 R12: 0000000000000001 [ 82.568967][ T8873] R13: 00000000006d41a0 R14: 0000000000000000 R15: 0000000000000000 [ 82.578454][ T8873] Kernel Offset: disabled [ 82.582907][ T8873] Rebooting in 86400 seconds..