[ 36.548800] audit: type=1800 audit(1551038442.284:27): pid=7561 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2436 res=0 [ 36.569687] audit: type=1800 audit(1551038442.284:28): pid=7561 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="ssh" dev="sda1" ino=2417 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. [ 37.578502] audit: type=1800 audit(1551038443.364:29): pid=7561 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="rc.local" dev="sda1" ino=2432 res=0 [ 37.603388] audit: type=1800 audit(1551038443.364:30): pid=7561 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="rmnologin" dev="sda1" ino=2423 res=0 Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.10.8' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 48.168540] ------------[ cut here ]------------ [ 48.174039] generic_make_request: Trying to write to read-only block-device nullb0 (partno 0) [ 48.183015] WARNING: CPU: 0 PID: 7715 at block/blk-core.c:802 generic_make_request_checks+0x1c8a/0x2140 [ 48.192550] Kernel panic - not syncing: panic_on_warn set ... [ 48.198443] CPU: 0 PID: 7715 Comm: syz-executor826 Not tainted 5.0.0-rc7+ #87 [ 48.205712] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 48.215059] Call Trace: [ 48.217665] dump_stack+0x172/0x1f0 [ 48.221305] ? generic_make_request_checks+0x1bb0/0x2140 [ 48.226765] panic+0x2cb/0x65c [ 48.229982] ? __warn_printk+0xf3/0xf3 [ 48.233896] ? generic_make_request_checks+0x1c8a/0x2140 [ 48.239349] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 48.244885] ? __warn.cold+0x5/0x45 [ 48.248514] ? __warn+0xe8/0x1d0 [ 48.251885] ? generic_make_request_checks+0x1c8a/0x2140 [ 48.257333] __warn.cold+0x20/0x45 [ 48.260878] ? vprintk_emit+0x1ce/0x6d0 [ 48.264942] ? generic_make_request_checks+0x1c8a/0x2140 [ 48.270396] report_bug+0x263/0x2b0 [ 48.274031] do_error_trap+0x11b/0x200 [ 48.277922] do_invalid_op+0x37/0x50 [ 48.281635] ? generic_make_request_checks+0x1c8a/0x2140 [ 48.287105] invalid_op+0x14/0x20 [ 48.290558] RIP: 0010:generic_make_request_checks+0x1c8a/0x2140 [ 48.296616] Code: 00 00 44 8b ab dc 04 00 00 48 8d b5 78 ff ff ff 4c 89 ff e8 98 7c 05 00 48 c7 c7 80 a4 a0 87 48 89 c6 44 89 ea e8 24 be 2b fe <0f> 0b 48 b8 00 00 00 00 00 fc ff df 4c 89 e2 48 c1 ea 03 80 3c 02 [ 48.315514] RSP: 0018:ffff88808f81ef80 EFLAGS: 00010286 [ 48.320879] RAX: 0000000000000000 RBX: ffff8880a34a9600 RCX: 0000000000000000 [ 48.328145] RDX: 0000000000000000 RSI: ffffffff815a92c6 RDI: ffffed1011f03de2 [ 48.335415] RBP: ffff88808f81f080 R08: ffff888092208200 R09: ffffed1015d03ef9 [ 48.342691] R10: ffffed1015d03ef8 R11: ffff8880ae81f7c7 R12: ffff8880921d9c88 [ 48.349960] R13: 0000000000000000 R14: 0000000000000001 R15: ffff8880921d9c80 [ 48.357244] ? vprintk_func+0x86/0x189 [ 48.361149] ? trace_event_raw_event_block_rq_requeue+0x640/0x640 [ 48.367383] ? mark_held_locks+0x100/0x100 [ 48.371977] generic_make_request+0x24c/0x12d0 [ 48.376562] ? find_held_lock+0x35/0x130 [ 48.380648] ? bio_associate_blkg_from_css+0x513/0x9d0 [ 48.385943] ? blk_queue_enter+0xe90/0xe90 [ 48.390186] ? lock_downgrade+0x810/0x810 [ 48.394338] submit_bio+0xba/0x480 [ 48.397875] ? submit_bio+0xba/0x480 [ 48.401593] ? generic_make_request+0x12d0/0x12d0 [ 48.406437] ? bio_reset+0x3b0/0x3b0 [ 48.410157] ? __sanitizer_cov_trace_cmp8+0x18/0x20 [ 48.415175] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 48.420203] ? wbc_account_io+0x17e/0x2a0 [ 48.424358] submit_bh_wbc+0x5f7/0x7f0 [ 48.428253] __block_write_full_page+0x771/0x1020 [ 48.433098] ? check_disk_change+0x140/0x140 [ 48.437538] block_write_full_page+0x21f/0x270 [ 48.442123] ? check_disk_change+0x140/0x140 [ 48.446548] blkdev_writepage+0x25/0x30 [ 48.450536] __writepage+0x67/0xe0 [ 48.454080] write_cache_pages+0x8af/0x1560 [ 48.458406] ? __wb_update_bandwidth+0x670/0x670 [ 48.463192] ? clear_page_dirty_for_io+0xff0/0xff0 [ 48.468219] ? __lock_acquire+0x53b/0x4700 [ 48.472461] ? is_bpf_text_address+0xac/0x170 [ 48.476966] ? __lock_acquire+0x53b/0x4700 [ 48.481209] generic_writepages+0xed/0x160 [ 48.485447] ? write_cache_pages+0x1560/0x1560 [ 48.490035] ? 0xffffffff81000000 [ 48.493515] ? wbc_attach_and_unlock_inode+0x51a/0x930 [ 48.498793] ? find_held_lock+0x35/0x130 [ 48.502886] ? blkdev_readpages+0x40/0x40 [ 48.507045] blkdev_writepages+0x1e/0x30 [ 48.511109] do_writepages+0xfc/0x2a0 [ 48.514916] ? page_writeback_cpu_online+0x20/0x20 [ 48.519864] ? do_raw_spin_lock+0x12a/0x2e0 [ 48.524193] ? kasan_check_read+0x11/0x20 [ 48.528345] ? do_raw_spin_unlock+0x57/0x270 [ 48.532759] ? _raw_spin_unlock+0x2d/0x50 [ 48.536912] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 48.542458] ? wbc_attach_and_unlock_inode+0x5c4/0x930 [ 48.547746] __filemap_fdatawrite_range+0x26d/0x340 [ 48.552768] ? delete_from_page_cache_batch+0x10e0/0x10e0 [ 48.558315] ? lockdep_hardirqs_on+0x415/0x5d0 [ 48.562927] filemap_write_and_wait+0x47/0xd0 [ 48.567428] __blkdev_put+0x204/0x810 [ 48.571237] ? bd_set_size+0xb0/0xb0 [ 48.574955] ? wait_for_completion+0x440/0x440 [ 48.579547] blkdev_put+0x98/0x560 [ 48.583089] ? __sanitizer_cov_trace_const_cmp2+0x18/0x20 [ 48.588626] ? blkdev_put+0x560/0x560 [ 48.592453] blkdev_close+0x8b/0xb0 [ 48.596101] __fput+0x2df/0x8d0 [ 48.599391] ____fput+0x16/0x20 [ 48.602685] task_work_run+0x14a/0x1c0 [ 48.606581] do_exit+0x92c/0x2fd0 [ 48.610048] ? get_signal+0x331/0x1d50 [ 48.613940] ? mm_update_next_owner+0x660/0x660 [ 48.618616] ? kasan_check_read+0x11/0x20 [ 48.622778] ? _raw_spin_unlock_irq+0x28/0x90 [ 48.627278] ? get_signal+0x331/0x1d50 [ 48.631164] ? _raw_spin_unlock_irq+0x28/0x90 [ 48.635678] do_group_exit+0x135/0x370 [ 48.639575] get_signal+0x399/0x1d50 [ 48.643476] ? vm_mmap_pgoff+0x107/0x230 [ 48.647545] do_signal+0x87/0x1940 [ 48.651088] ? vma_is_stack_for_current+0xd0/0xd0 [ 48.655931] ? iterate_fd+0x360/0x360 [ 48.659742] ? setup_sigcontext+0x7d0/0x7d0 [ 48.664076] ? exit_to_usermode_loop+0x43/0x2c0 [ 48.668766] ? do_syscall_64+0x52d/0x610 [ 48.672828] ? exit_to_usermode_loop+0x43/0x2c0 [ 48.677500] ? lockdep_hardirqs_on+0x415/0x5d0 [ 48.682083] ? trace_hardirqs_on+0x67/0x230 [ 48.686410] exit_to_usermode_loop+0x244/0x2c0 [ 48.690998] do_syscall_64+0x52d/0x610 [ 48.694892] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 48.700080] RIP: 0033:0x445719 [ 48.703279] Code: Bad RIP value. [ 48.706638] RSP: 002b:00007f2570746db8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca [ 48.714360] RAX: fffffffffffffe00 RBX: 00000000006dac38 RCX: 0000000000445719 [ 48.721625] RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00000000006dac38 [ 48.728898] RBP: 00000000006dac30 R08: 0000000000000000 R09: 0000000000000000 [ 48.736168] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dac3c [ 48.743436] R13: 00007ffce465744f R14: 00007f25707479c0 R15: 20c49ba5e353f7cf [ 48.752063] Kernel Offset: disabled [ 48.755738] Rebooting in 86400 seconds..