[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. [ 30.106189] kauditd_printk_skb: 8 callbacks suppressed [ 30.106203] audit: type=1800 audit(1543894333.682:29): pid=5943 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 [ 30.138546] audit: type=1800 audit(1543894333.682:30): pid=5943 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="rmnologin" dev="sda1" ino=2423 res=0 [ 31.135194] sshd (6079) used greatest stack depth: 15744 bytes left Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.10.45' (ECDSA) to the list of known hosts. 2018/12/04 03:32:21 parsed 1 programs 2018/12/04 03:32:24 executed programs: 0 syzkaller login: [ 40.778004] IPVS: ftp: loaded support on port[0] = 21 [ 41.031367] bridge0: port 1(bridge_slave_0) entered blocking state [ 41.037944] bridge0: port 1(bridge_slave_0) entered disabled state [ 41.045987] device bridge_slave_0 entered promiscuous mode [ 41.072021] bridge0: port 2(bridge_slave_1) entered blocking state [ 41.078551] bridge0: port 2(bridge_slave_1) entered disabled state [ 41.085766] device bridge_slave_1 entered promiscuous mode [ 41.105133] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 41.123002] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 41.174791] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 41.195826] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 41.277438] IPv6: ADDRCONF(NETDEV_UP): team_slave_0: link is not ready [ 41.284884] team0: Port device team_slave_0 added [ 41.302011] IPv6: ADDRCONF(NETDEV_UP): team_slave_1: link is not ready [ 41.309467] team0: Port device team_slave_1 added [ 41.328279] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 41.349092] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 41.369876] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 41.389848] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready [ 41.544551] bridge0: port 2(bridge_slave_1) entered blocking state [ 41.550993] bridge0: port 2(bridge_slave_1) entered forwarding state [ 41.558100] bridge0: port 1(bridge_slave_0) entered blocking state [ 41.564495] bridge0: port 1(bridge_slave_0) entered forwarding state [ 42.109306] 8021q: adding VLAN 0 to HW filter on device bond0 [ 42.161499] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 42.215367] IPv6: ADDRCONF(NETDEV_UP): veth1: link is not ready [ 42.221535] IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready [ 42.229785] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 42.280083] 8021q: adding VLAN 0 to HW filter on device team0 [ 42.677864] ------------[ cut here ]------------ [ 42.682800] generic_make_request: Trying to write to read-only block-device loop0 (partno 0) [ 42.691834] WARNING: CPU: 0 PID: 6366 at block/blk-core.c:2170 generic_make_request_checks+0xef9/0x26c0 [ 42.701392] Kernel panic - not syncing: panic_on_warn set ... [ 42.707280] CPU: 0 PID: 6366 Comm: syz-executor0 Not tainted 4.20.0-rc5+ #265 [ 42.714539] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 42.723879] Call Trace: [ 42.726464] dump_stack+0x244/0x39d [ 42.730112] ? dump_stack_print_info.cold.1+0x20/0x20 [ 42.735310] panic+0x2ad/0x55c [ 42.738490] ? add_taint.cold.5+0x16/0x16 [ 42.742629] ? __warn.cold.8+0x5/0x45 [ 42.746414] ? __warn+0xe8/0x1d0 [ 42.749773] ? generic_make_request_checks+0xef9/0x26c0 [ 42.755125] __warn.cold.8+0x20/0x45 [ 42.758824] ? rcu_softirq_qs+0x20/0x20 [ 42.762785] ? generic_make_request_checks+0xef9/0x26c0 [ 42.768143] report_bug+0x254/0x2d0 [ 42.771765] do_error_trap+0x11b/0x200 [ 42.775639] do_invalid_op+0x36/0x40 [ 42.779336] ? generic_make_request_checks+0xef9/0x26c0 [ 42.784696] invalid_op+0x14/0x20 [ 42.788141] RIP: 0010:generic_make_request_checks+0xef9/0x26c0 [ 42.794138] Code: 8b ad e4 04 00 00 4c 8d b5 78 ff ff ff 48 89 df 4c 89 f6 e8 29 94 07 00 48 c7 c7 60 30 5f 88 48 89 c6 44 89 ea e8 37 cb cf fd <0f> 0b e9 c1 f4 ff ff e8 1b 6b 06 fe e8 f6 42 f0 fd e8 11 6b 06 fe [ 42.813037] RSP: 0018:ffff8881b752eb60 EFLAGS: 00010282 [ 42.818387] RAX: 0000000000000000 RBX: ffff8881cda7fc00 RCX: 0000000000000000 [ 42.825643] RDX: 0000000000000000 RSI: ffffffff8165fbe5 RDI: 0000000000000005 [ 42.832902] RBP: ffff8881b752ee60 R08: ffff8881b7628040 R09: 0000000000000006 [ 42.840166] R10: 0000000000000000 R11: ffff8881b7628040 R12: ffff8881cda7fc08 [ 42.847425] R13: 0000000000000000 R14: ffff8881b752edd8 R15: ffff8881d1972000 [ 42.854702] ? vprintk_func+0x85/0x181 [ 42.858584] ? trace_event_raw_event_block_rq_requeue+0x6d0/0x6d0 [ 42.864807] ? __lock_acquire+0x62f/0x4c20 [ 42.869042] ? depot_save_stack+0x292/0x470 [ 42.873354] ? __lock_acquire+0x62f/0x4c20 [ 42.877592] ? mark_held_locks+0x130/0x130 [ 42.881811] ? blkdev_writepage+0x24/0x30 [ 42.885949] ? mark_held_locks+0x130/0x130 [ 42.890204] ? __ia32_compat_sys_ioctl+0x20e/0x630 [ 42.895138] ? do_fast_syscall_32+0x34d/0xfb2 [ 42.899647] ? entry_SYSENTER_compat+0x70/0x7f [ 42.904219] ? zap_class+0x640/0x640 [ 42.907921] ? trace_hardirqs_on+0xbd/0x310 [ 42.912231] ? zap_class+0x640/0x640 [ 42.915952] ? check_preemption_disabled+0x48/0x280 [ 42.920962] generic_make_request+0x2c7/0x18a0 [ 42.925560] ? zap_class+0x640/0x640 [ 42.929272] ? blk_get_request+0x800/0x800 [ 42.933496] ? rcu_read_lock_sched_held+0x14f/0x180 [ 42.938498] ? zap_class+0x640/0x640 [ 42.942197] ? zap_class+0x640/0x640 [ 42.945901] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 42.951428] ? check_preemption_disabled+0x48/0x280 [ 42.956436] ? find_held_lock+0x36/0x1c0 [ 42.960499] ? guard_bio_eod+0x1f4/0x630 [ 42.964560] ? lock_downgrade+0x900/0x900 [ 42.968704] ? check_preemption_disabled+0x48/0x280 [ 42.973710] submit_bio+0xba/0x460 [ 42.977233] ? submit_bio+0xba/0x460 [ 42.980931] ? rcu_softirq_qs+0x20/0x20 [ 42.984958] ? generic_make_request+0x18a0/0x18a0 [ 42.989794] ? __bio_add_page+0x134/0x290 [ 42.993952] ? __sanitizer_cov_trace_cmp8+0x18/0x20 [ 42.998961] ? guard_bio_eod+0x2bb/0x630 [ 43.003029] submit_bh_wbc+0x5de/0x790 [ 43.006926] __block_write_full_page+0x93b/0x14a0 [ 43.011773] ? I_BDEV+0x20/0x20 [ 43.015038] ? bh_uptodate_or_lock+0x160/0x160 [ 43.019611] ? submit_bh_wbc+0x790/0x790 [ 43.023681] ? trace_hardirqs_on+0xbd/0x310 [ 43.027990] ? tag_pages_for_writeback+0x5ff/0x7d0 [ 43.032915] ? zap_class+0x640/0x640 [ 43.036640] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 43.042178] ? check_preemption_disabled+0x48/0x280 [ 43.047194] block_write_full_page+0x221/0x270 [ 43.051776] ? I_BDEV+0x20/0x20 [ 43.055060] blkdev_writepage+0x24/0x30 [ 43.059049] __writepage+0x69/0xe0 [ 43.062577] write_cache_pages+0xc91/0x1e20 [ 43.066895] ? __wb_update_bandwidth+0x680/0x680 [ 43.071648] ? clear_page_dirty_for_io+0x1900/0x1900 [ 43.076740] ? trace_event_raw_event_lock_acquire+0x440/0x440 [ 43.082612] ? zap_class+0x640/0x640 [ 43.086318] ? mark_held_locks+0x130/0x130 [ 43.090547] ? mark_held_locks+0x130/0x130 [ 43.094770] ? is_bpf_text_address+0xac/0x170 [ 43.099253] ? lock_downgrade+0x900/0x900 [ 43.103416] ? check_preemption_disabled+0x48/0x280 [ 43.108431] ? rcu_read_unlock_special+0x1c0/0x1c0 [ 43.113360] ? kasan_check_read+0x11/0x20 [ 43.117507] ? rcu_dynticks_curr_cpu_in_eqs+0xa2/0x170 [ 43.122771] ? rcu_softirq_qs+0x20/0x20 [ 43.126748] ? zap_class+0x640/0x640 [ 43.130463] ? zap_class+0x640/0x640 [ 43.134174] ? kernel_text_address+0x79/0xf0 [ 43.138572] ? __kernel_text_address+0xd/0x40 [ 43.143056] ? unwind_get_return_address+0x61/0xa0 [ 43.147974] ? blk_start_plug+0xcc/0x370 [ 43.152021] ? blk_lld_busy+0x70/0x70 [ 43.155851] generic_writepages+0xda/0x150 [ 43.160072] ? write_cache_pages+0x1e20/0x1e20 [ 43.164671] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 43.170199] ? wbc_attach_and_unlock_inode+0x675/0xa30 [ 43.175522] blkdev_writepages+0x1d/0x30 [ 43.179566] ? blkdev_readpages+0x40/0x40 [ 43.183700] do_writepages+0x9a/0x1a0 [ 43.187489] __filemap_fdatawrite_range+0x364/0x4a0 [ 43.192493] ? delete_from_page_cache_batch+0x1640/0x1640 [ 43.198025] ? kobject_uevent_env+0x100d/0x101e [ 43.202681] filemap_write_and_wait+0x44/0xc0 [ 43.207168] set_blocksize+0x207/0x340 [ 43.211075] lo_ioctl+0x13ec/0x1d60 [ 43.214706] lo_compat_ioctl+0xbb/0x170 [ 43.218675] ? lo_ioctl+0x1d60/0x1d60 [ 43.222476] compat_blkdev_ioctl+0x3ca/0x1b30 [ 43.226977] ? bfq_create_group_hierarchy+0x120/0x120 [ 43.232164] ? lockdep_hardirqs_on+0x3bb/0x5b0 [ 43.236737] ? bfq_create_group_hierarchy+0x120/0x120 [ 43.241914] __ia32_compat_sys_ioctl+0x20e/0x630 [ 43.246665] do_fast_syscall_32+0x34d/0xfb2 [ 43.250978] ? do_int80_syscall_32+0x890/0x890 [ 43.255565] ? entry_SYSENTER_compat+0x68/0x7f [ 43.260135] ? trace_hardirqs_off_caller+0xbb/0x310 [ 43.265147] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 43.269985] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 43.274815] ? trace_hardirqs_on_caller+0x310/0x310 [ 43.279836] ? prepare_exit_to_usermode+0x291/0x3b0 [ 43.284843] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 43.289674] entry_SYSENTER_compat+0x70/0x7f [ 43.294067] RIP: 0023:0xf7f7ca29 [ 43.297435] Code: 85 d2 74 02 89 0a 5b 5d c3 8b 04 24 c3 8b 14 24 c3 8b 3c 24 c3 90 90 90 90 90 90 90 90 90 90 90 90 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 eb 0d 90 90 90 90 90 90 90 90 90 90 90 90 [ 43.316444] RSP: 002b:00000000ffd3e8bc EFLAGS: 00000296 ORIG_RAX: 0000000000000036 [ 43.324161] RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 0000000000004c00 [ 43.331454] RDX: 0000000000000006 RSI: 0000000000000000 RDI: 0000000000000000 [ 43.338710] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 [ 43.345964] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 43.353266] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 43.361710] Kernel Offset: disabled [ 43.365383] Rebooting in 86400 seconds..