[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. [ 71.130800][ T25] kauditd_printk_skb: 7 callbacks suppressed [ 71.130811][ T25] audit: type=1800 audit(1575282419.385:39): pid=9521 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:kernel_t:s0 op=collect_data cause=failed(directio) comm="startpar" name="rc.local" dev="sda1" ino=2432 res=0 [ 71.158871][ T25] audit: type=1800 audit(1575282419.385:40): pid=9521 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:kernel_t:s0 op=collect_data cause=failed(directio) comm="startpar" name="rmnologin" dev="sda1" ino=2423 res=0 Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 74.009549][ T25] audit: type=1400 audit(1575282422.265:41): avc: denied { map } for pid=9699 comm="bash" path="/bin/bash" dev="sda1" ino=1457 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=1 Warning: Permanently added '10.128.15.194' (ECDSA) to the list of known hosts. executing program [ 80.511000][ T25] audit: type=1400 audit(1575282428.765:42): avc: denied { map } for pid=9711 comm="syz-executor256" path="/root/syz-executor256760310" dev="sda1" ino=16483 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1 [ 80.518306][ T9711] ------------[ cut here ]------------ [ 80.543622][ T9711] generic_make_request: Trying to write to read-only block-device nullb0 (partno 0) [ 80.544394][ T25] audit: type=1400 audit(1575282428.765:43): avc: denied { map } for pid=9711 comm="syz-executor256" path="/dev/nullb0" dev="devtmpfs" ino=1627 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=system_u:object_r:device_t:s0 tclass=blk_file permissive=1 [ 80.563123][ T9711] WARNING: CPU: 1 PID: 9711 at block/blk-core.c:800 generic_make_request_checks+0x1c78/0x2190 [ 80.589253][ T9711] Kernel panic - not syncing: panic_on_warn set ... [ 80.595844][ T9711] CPU: 1 PID: 9711 Comm: syz-executor256 Not tainted 5.4.0-syzkaller #0 [ 80.604147][ T9711] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 80.614187][ T9711] Call Trace: [ 80.617470][ T9711] dump_stack+0x197/0x210 [ 80.621786][ T9711] ? generic_make_request_checks+0x1c70/0x2190 [ 80.627922][ T9711] panic+0x2e3/0x75c [ 80.631805][ T9711] ? add_taint.cold+0x16/0x16 [ 80.636469][ T9711] ? __kasan_check_write+0x14/0x20 [ 80.641562][ T9711] ? __warn.cold+0x14/0x3e [ 80.645958][ T9711] ? __warn+0xd9/0x1cf [ 80.650019][ T9711] ? generic_make_request_checks+0x1c78/0x2190 [ 80.656155][ T9711] __warn.cold+0x2f/0x3e [ 80.660380][ T9711] ? generic_make_request_checks+0x1c78/0x2190 [ 80.666515][ T9711] report_bug+0x289/0x300 [ 80.670827][ T9711] do_error_trap+0x11b/0x200 [ 80.675411][ T9711] do_invalid_op+0x37/0x50 [ 80.679817][ T9711] ? generic_make_request_checks+0x1c78/0x2190 [ 80.685954][ T9711] invalid_op+0x23/0x30 [ 80.690091][ T9711] RIP: 0010:generic_make_request_checks+0x1c78/0x2190 [ 80.696834][ T9711] Code: 00 00 44 8b ab 5c 05 00 00 48 8d b5 78 ff ff ff 4c 89 ff e8 4a 95 05 00 48 c7 c7 c0 ca 4d 88 48 89 c6 44 89 ea e8 97 55 cc fd <0f> 0b 48 b8 00 00 00 00 00 fc ff df 4c 89 e2 48 c1 ea 03 80 3c 02 [ 80.716437][ T9711] RSP: 0018:ffff88809150f1c0 EFLAGS: 00010286 [ 80.722512][ T9711] RAX: 0000000000000000 RBX: ffff8880a2494000 RCX: 0000000000000000 [ 80.730489][ T9711] RDX: 0000000000000000 RSI: ffffffff815e47f6 RDI: ffffed10122a1e2a [ 80.738446][ T9711] RBP: ffff88809150f2c0 R08: ffff8880a4386180 R09: ffffed1015d26621 [ 80.746399][ T9711] R10: ffffed1015d26620 R11: ffff8880ae933107 R12: ffff8880a0591208 [ 80.754363][ T9711] R13: 0000000000000000 R14: 0000000000000001 R15: ffff8880a0591200 [ 80.762344][ T9711] ? vprintk_func+0x86/0x189 [ 80.766932][ T9711] ? trace_event_raw_event_block_rq_requeue+0x640/0x640 [ 80.773850][ T9711] ? __kasan_check_read+0x11/0x20 [ 80.778855][ T9711] ? __lock_acquire+0x8a0/0x4a00 [ 80.783771][ T9711] ? __kasan_check_read+0x11/0x20 [ 80.788781][ T9711] generic_make_request+0x8f/0xb50 [ 80.793876][ T9711] ? blk_queue_enter+0xe30/0xe30 [ 80.798796][ T9711] ? lock_downgrade+0x920/0x920 [ 80.803632][ T9711] submit_bio+0x113/0x600 [ 80.807945][ T9711] ? submit_bio+0x113/0x600 [ 80.812434][ T9711] ? generic_make_request+0xb50/0xb50 [ 80.817789][ T9711] ? bio_associate_blkg_from_css+0x4fd/0x980 [ 80.823766][ T9711] ? bio_reset+0x3a0/0x3a0 [ 80.828166][ T9711] ? __sanitizer_cov_trace_cmp8+0x18/0x20 [ 80.833862][ T9711] ? guard_bio_eod+0x28f/0x6c0 [ 80.838612][ T9711] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 80.844321][ T9711] submit_bh_wbc+0x6b6/0x900 [ 80.848896][ T9711] __block_write_full_page+0x7fe/0x11b0 [ 80.854427][ T9711] ? bdev_evict_inode+0x5c0/0x5c0 [ 80.859432][ T9711] ? try_to_free_buffers+0x7e0/0x7e0 [ 80.864701][ T9711] block_write_full_page+0x21f/0x270 [ 80.869965][ T9711] ? bdev_evict_inode+0x5c0/0x5c0 [ 80.874970][ T9711] blkdev_writepage+0x25/0x30 [ 80.879632][ T9711] __writepage+0x66/0x110 [ 80.883941][ T9711] write_cache_pages+0x80c/0x13f0 [ 80.888949][ T9711] ? tag_pages_for_writeback+0x4b0/0x4b0 [ 80.894567][ T9711] ? clear_page_dirty_for_io+0xde0/0xde0 [ 80.900178][ T9711] ? lock_downgrade+0x920/0x920 [ 80.905015][ T9711] ? ep_poll_callback+0x730/0xe60 [ 80.910023][ T9711] ? __kasan_check_read+0x11/0x20 [ 80.915043][ T9711] ? mark_lock+0xc2/0x1220 [ 80.919445][ T9711] generic_writepages+0xed/0x160 [ 80.924363][ T9711] ? write_cache_pages+0x13f0/0x13f0 [ 80.929633][ T9711] ? wbc_attach_and_unlock_inode+0x515/0xa00 [ 80.935596][ T9711] ? find_held_lock+0x35/0x130 [ 80.940347][ T9711] ? blkdev_readpages+0x40/0x40 [ 80.945178][ T9711] blkdev_writepages+0x1e/0x30 [ 80.949923][ T9711] do_writepages+0xfa/0x2a0 [ 80.954413][ T9711] ? page_writeback_cpu_online+0x20/0x20 [ 80.960030][ T9711] ? do_raw_spin_unlock+0x178/0x270 [ 80.965209][ T9711] ? _raw_spin_unlock+0x28/0x40 [ 80.970042][ T9711] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 80.976262][ T9711] ? wbc_attach_and_unlock_inode+0x637/0xa00 [ 80.982225][ T9711] __filemap_fdatawrite_range+0x2bc/0x3b0 [ 80.987927][ T9711] ? delete_from_page_cache_batch+0xfe0/0xfe0 [ 80.994004][ T9711] ? lock_downgrade+0x920/0x920 [ 80.998856][ T9711] filemap_write_and_wait+0xf8/0x1e0 [ 81.004132][ T9711] __blkdev_put+0x204/0x810 [ 81.008625][ T9711] ? bd_set_size+0xb0/0xb0 [ 81.013024][ T9711] ? wait_for_completion+0x440/0x440 [ 81.018296][ T9711] blkdev_put+0x98/0x560 [ 81.022520][ T9711] ? __sanitizer_cov_trace_const_cmp2+0x18/0x20 [ 81.028739][ T9711] blkdev_close+0x8b/0xb0 [ 81.033187][ T9711] __fput+0x2ff/0x890 [ 81.037159][ T9711] ? blkdev_put+0x560/0x560 [ 81.041664][ T9711] ____fput+0x16/0x20 [ 81.045643][ T9711] task_work_run+0x145/0x1c0 [ 81.050233][ T9711] do_exit+0x8e7/0x2ef0 [ 81.054389][ T9711] ? mm_update_next_owner+0x7c0/0x7c0 [ 81.059747][ T9711] ? tomoyo_file_ioctl+0x23/0x30 [ 81.064667][ T9711] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 81.070899][ T9711] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 81.076338][ T9711] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 81.081790][ T9711] do_group_exit+0x135/0x360 [ 81.086362][ T9711] __x64_sys_exit_group+0x44/0x50 [ 81.091378][ T9711] do_syscall_64+0xfa/0x790 [ 81.095869][ T9711] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 81.101742][ T9711] RIP: 0033:0x43edf8 [ 81.105624][ T9711] Code: Bad RIP value. [ 81.109694][ T9711] RSP: 002b:00007ffd9c0e1638 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 81.118100][ T9711] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043edf8 [ 81.126052][ T9711] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 81.134005][ T9711] RBP: 00000000004be608 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 81.141963][ T9711] R10: 0000000000000003 R11: 0000000000000246 R12: 0000000000000001 [ 81.149914][ T9711] R13: 00000000006d0180 R14: 0000000000000000 R15: 0000000000000000 [ 81.159494][ T9711] Kernel Offset: disabled [ 81.163899][ T9711] Rebooting in 86400 seconds..