[ 67.314671][ T24] audit: type=1800 audit(1560255377.730:25): pid=8779 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 67.354071][ T24] audit: type=1800 audit(1560255377.730:26): pid=8779 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 67.399821][ T24] audit: type=1800 audit(1560255377.730:27): pid=8779 uid=0 auid=4294967295 ses=4294967295 subj=_ 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. [....] startpar: service(s) returned failure: ssh ...[?25l[?1c7[FAIL8[?25h[?0c failed! Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.1.28' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 85.860591][ T8956] ------------[ cut here ]------------ [ 85.866281][ T8956] generic_make_request: Trying to write to read-only block-device nullb0 (partno 0) [ 85.866629][ T8956] WARNING: CPU: 0 PID: 8956 at block/blk-core.c:758 generic_make_request_checks+0x1c0c/0x2070 [ 85.875938][ T3878] kobject: 'nullb0' (000000004c7778b9): fill_kobj_path: path = '/devices/virtual/block/nullb0' [ 85.886013][ T8956] Kernel panic - not syncing: panic_on_warn set ... [ 85.886031][ T8956] CPU: 0 PID: 8956 Comm: syz-executor387 Not tainted 5.2.0-rc4+ #26 [ 85.886038][ T8956] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 85.886043][ T8956] Call Trace: [ 85.886069][ T8956] dump_stack+0x172/0x1f0 [ 85.886088][ T8956] ? generic_make_request_checks+0x1b90/0x2070 [ 85.886104][ T8956] panic+0x2cb/0x744 [ 85.886118][ T8956] ? __warn_printk+0xf3/0xf3 [ 85.886145][ T8956] ? generic_make_request_checks+0x1c0c/0x2070 [ 85.952836][ T8956] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 85.959233][ T8956] ? __warn.cold+0x5/0x4d [ 85.963810][ T8956] ? __warn+0xe8/0x1d0 [ 85.967889][ T8956] ? generic_make_request_checks+0x1c0c/0x2070 [ 85.974135][ T8956] __warn.cold+0x20/0x4d [ 85.978470][ T8956] ? vprintk_emit+0x1ea/0x700 [ 85.983178][ T8956] ? generic_make_request_checks+0x1c0c/0x2070 [ 85.989387][ T8956] report_bug+0x263/0x2b0 [ 85.993715][ T8956] do_error_trap+0x11b/0x200 [ 85.998512][ T8956] do_invalid_op+0x37/0x50 [ 86.002919][ T8956] ? generic_make_request_checks+0x1c0c/0x2070 [ 86.009072][ T8956] invalid_op+0x14/0x20 [ 86.013250][ T8956] RIP: 0010:generic_make_request_checks+0x1c0c/0x2070 [ 86.020076][ T8956] Code: 00 00 44 8b ab b4 04 00 00 48 8d b5 78 ff ff ff 4c 89 ff e8 f6 76 05 00 48 c7 c7 a0 1b a3 87 48 89 c6 44 89 ea e8 92 71 21 fe <0f> 0b 48 b8 00 00 00 00 00 fc ff df 4c 89 e2 48 c1 ea 03 80 3c 02 [ 86.040122][ T8956] RSP: 0018:ffff88808a3d6f80 EFLAGS: 00010286 [ 86.046186][ T8956] RAX: 0000000000000000 RBX: ffff8880a3362b00 RCX: 0000000000000000 [ 86.054332][ T8956] RDX: 0000000000000000 RSI: ffffffff815ac976 RDI: ffffed101147ade2 [ 86.062344][ T8956] RBP: ffff88808a3d7080 R08: ffff8880a4b66340 R09: ffffed1015d040f1 [ 86.070321][ T8956] R10: ffffed1015d040f0 R11: ffff8880ae820787 R12: ffff8880a13df008 [ 86.078282][ T8956] R13: 0000000000000000 R14: 0000000000000001 R15: ffff8880a13df000 [ 86.086320][ T8956] ? vprintk_func+0x86/0x189 [ 86.090926][ T8956] ? trace_event_raw_event_block_rq_requeue+0x640/0x640 [ 86.097949][ T8956] ? mark_held_locks+0xf0/0xf0 [ 86.102836][ T8956] generic_make_request+0x8f/0xb40 [ 86.107937][ T8956] ? find_held_lock+0x35/0x130 [ 86.112798][ T8956] ? bio_associate_blkg_from_css+0x4e5/0x990 [ 86.118766][ T8956] ? blk_queue_enter+0xe90/0xe90 [ 86.123878][ T8956] ? lock_downgrade+0x880/0x880 [ 86.128805][ T8956] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 86.135034][ T8956] submit_bio+0xba/0x480 [ 86.139257][ T8956] ? submit_bio+0xba/0x480 [ 86.143662][ T8956] ? generic_make_request+0xb40/0xb40 [ 86.149023][ T8956] ? bio_reset+0x3b0/0x3b0 [ 86.153433][ T8956] ? __sanitizer_cov_trace_cmp8+0x18/0x20 [ 86.159183][ T8956] ? guard_bio_eod+0x295/0x6c0 [ 86.163939][ T8956] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 86.169747][ T8956] ? wbc_account_io+0x17e/0x2a0 [ 86.174591][ T8956] submit_bh_wbc+0x5f7/0x7f0 [ 86.179574][ T8956] __block_write_full_page+0x76e/0x1020 [ 86.185345][ T8956] ? check_disk_change+0x140/0x140 [ 86.190450][ T8956] block_write_full_page+0x21f/0x270 [ 86.195722][ T8956] ? check_disk_change+0x140/0x140 [ 86.201102][ T8956] blkdev_writepage+0x25/0x30 [ 86.205889][ T8956] __writepage+0x62/0xe0 [ 86.210122][ T8956] write_cache_pages+0x7bf/0x1380 [ 86.215279][ T8956] ? __wb_update_bandwidth+0x670/0x670 [ 86.220742][ T8956] ? clear_page_dirty_for_io+0xdc0/0xdc0 [ 86.226372][ T8956] ? is_bpf_text_address+0xac/0x170 [ 86.231612][ T8956] ? __lock_acquire+0x54f/0x5490 [ 86.236715][ T8956] ? __lock_acquire+0x54f/0x5490 [ 86.241656][ T8956] generic_writepages+0xed/0x160 [ 86.246756][ T8956] ? write_cache_pages+0x1380/0x1380 [ 86.252037][ T8956] ? wbc_attach_and_unlock_inode+0x51a/0x930 [ 86.258011][ T8956] ? find_held_lock+0x35/0x130 [ 86.262762][ T8956] ? blkdev_readpages+0x40/0x40 [ 86.267649][ T8956] blkdev_writepages+0x1e/0x30 [ 86.272526][ T8956] do_writepages+0xfa/0x2a0 [ 86.277164][ T8956] ? page_writeback_cpu_online+0x20/0x20 [ 86.282989][ T8956] ? kasan_check_read+0x11/0x20 [ 86.287947][ T8956] ? do_raw_spin_unlock+0x57/0x270 [ 86.293054][ T8956] ? _raw_spin_unlock+0x2d/0x50 [ 86.297894][ T8956] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 86.304131][ T8956] ? wbc_attach_and_unlock_inode+0x5c4/0x930 [ 86.318474][ T8956] __filemap_fdatawrite_range+0x26d/0x340 [ 86.324196][ T8956] ? delete_from_page_cache_batch+0xf90/0xf90 [ 86.330481][ T8956] ? lockdep_hardirqs_on+0x418/0x5d0 [ 86.335948][ T8956] filemap_write_and_wait+0x47/0xd0 [ 86.341221][ T8956] __blkdev_put+0x204/0x810 [ 86.345729][ T8956] ? bd_set_size+0xb0/0xb0 [ 86.350370][ T8956] ? wait_for_completion+0x440/0x440 [ 86.355864][ T8956] blkdev_put+0x98/0x560 [ 86.360105][ T8956] ? __sanitizer_cov_trace_const_cmp2+0x18/0x20 [ 86.366601][ T8956] blkdev_close+0x8b/0xb0 [ 86.370924][ T8956] __fput+0x2ff/0x890 [ 86.375136][ T8956] ? blkdev_put+0x560/0x560 [ 86.379898][ T8956] ____fput+0x16/0x20 [ 86.383868][ T8956] task_work_run+0x145/0x1c0 [ 86.388766][ T8956] do_exit+0x90a/0x2fa0 [ 86.392988][ T8956] ? get_signal+0x387/0x24b0 [ 86.397765][ T8956] ? mm_update_next_owner+0x640/0x640 [ 86.403181][ T8956] ? kasan_check_write+0x14/0x20 [ 86.408475][ T8956] ? _raw_spin_unlock_irq+0x28/0x90 [ 86.413757][ T8956] ? get_signal+0x387/0x24b0 [ 86.418979][ T8956] ? _raw_spin_unlock_irq+0x28/0x90 [ 86.424212][ T8956] do_group_exit+0x135/0x370 [ 86.429322][ T8956] get_signal+0x471/0x24b0 [ 86.433908][ T8956] ? exit_robust_list+0x2c0/0x2c0 [ 86.439119][ T8956] ? kasan_check_write+0x14/0x20 [ 86.444347][ T8956] ? vm_mmap_pgoff+0x107/0x230 [ 86.449384][ T8956] do_signal+0x87/0x1900 [ 86.453907][ T8956] ? vma_is_stack_for_current+0xd0/0xd0 [ 86.459628][ T8956] ? ksys_dup3+0x3e0/0x3e0 [ 86.464480][ T8956] ? setup_sigcontext+0x7d0/0x7d0 [ 86.469554][ T8956] ? fput_many+0x12c/0x1a0 [ 86.474167][ T8956] ? exit_to_usermode_loop+0x43/0x2c0 [ 86.479571][ T8956] ? do_syscall_64+0x58e/0x680 [ 86.484329][ T8956] ? exit_to_usermode_loop+0x43/0x2c0 [ 86.489698][ T8956] ? lockdep_hardirqs_on+0x418/0x5d0 [ 86.495197][ T8956] ? trace_hardirqs_on+0x67/0x220 [ 86.500350][ T8956] exit_to_usermode_loop+0x244/0x2c0 [ 86.505812][ T8956] do_syscall_64+0x58e/0x680 [ 86.510566][ T8956] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 86.516494][ T8956] RIP: 0033:0x445869 [ 86.520422][ T8956] Code: Bad RIP value. [ 86.524740][ T8956] RSP: 002b:00007fcf6e53cdb8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca [ 86.539365][ T8956] RAX: fffffffffffffe00 RBX: 00000000006dac48 RCX: 0000000000445869 [ 86.548037][ T8956] RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00000000006dac48 [ 86.556207][ T8956] RBP: 00000000006dac40 R08: 0000000000000000 R09: 0000000000000000 [ 86.564539][ T8956] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dac4c [ 86.572878][ T8956] R13: 00007fff0b7c111f R14: 00007fcf6e53d9c0 R15: 20c49ba5e353f7cf [ 86.581973][ T8956] Kernel Offset: disabled [ 86.586387][ T8956] Rebooting in 86400 seconds..