[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. [ 28.122157] kauditd_printk_skb: 8 callbacks suppressed [ 28.122170] audit: type=1800 audit(1545395598.076:29): pid=5877 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 [ 28.155103] audit: type=1800 audit(1545395598.076:30): pid=5877 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 '10.128.0.124' (ECDSA) to the list of known hosts. 2018/12/21 12:33:26 fuzzer started 2018/12/21 12:33:28 connecting to host at 10.128.0.26:39643 2018/12/21 12:33:28 checking revisions... 2018/12/21 12:33:28 testing simple program... syzkaller login: [ 38.860319] IPVS: ftp: loaded support on port[0] = 21 executing program executing program executing program executing program executing program executing program executing program [ 59.792973] WARNING: CPU: 1 PID: 45 at include/linux/blk-cgroup.h:518 __bio_associate_blkg.isra.36+0x80b/0x8f0 [ 59.803319] Kernel panic - not syncing: panic_on_warn set ... [ 59.809205] CPU: 1 PID: 45 Comm: kworker/u4:2 Not tainted 4.20.0-rc7-next-20181221 #183 [ 59.817334] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 59.826767] Workqueue: writeback wb_workfn (flush-8:0) [ 59.832058] Call Trace: [ 59.834649] dump_stack+0x1d3/0x2c6 [ 59.838289] ? dump_stack_print_info.cold.1+0x20/0x20 [ 59.843494] panic+0x2ad/0x632 [ 59.846696] ? add_taint.cold.5+0x16/0x16 [ 59.850866] ? __warn.cold.8+0x5/0x4f [ 59.854707] ? __warn+0xe8/0x1d0 [ 59.858091] ? __bio_associate_blkg.isra.36+0x80b/0x8f0 [ 59.863457] __warn.cold.8+0x20/0x4f [ 59.867175] ? rcu_softirq_qs+0x20/0x20 [ 59.871154] ? __bio_associate_blkg.isra.36+0x80b/0x8f0 [ 59.876526] report_bug+0x254/0x2d0 [ 59.880167] do_error_trap+0x11b/0x200 [ 59.884063] do_invalid_op+0x36/0x40 [ 59.887792] ? __bio_associate_blkg.isra.36+0x80b/0x8f0 [ 59.893153] invalid_op+0x14/0x20 [ 59.896611] RIP: 0010:__bio_associate_blkg.isra.36+0x80b/0x8f0 [ 59.902585] Code: 7b 50 48 89 f8 48 c1 e8 03 42 80 3c 20 00 0f 85 f1 00 00 00 48 8b 43 50 4c 89 ef e8 bf c6 88 04 e9 a4 f9 ff ff e8 c5 ad 07 fe <0f> 0b e9 5c fa ff ff e8 b9 ad 07 fe e8 ab e2 88 fd e9 fe f9 ff ff [ 59.921486] RSP: 0018:ffff8881d95d5738 EFLAGS: 00010293 [ 59.926854] RAX: ffff8881d95ca440 RBX: 0000000000000000 RCX: ffffffff83779576 [ 59.934127] RDX: 0000000000000000 RSI: ffffffff83779b1b RDI: 0000000000000005 [ 59.941394] RBP: ffff8881d95d58b8 R08: ffff8881d95ca440 R09: ffffed103b5e5b77 [ 59.948669] R10: ffffed103b5e5b77 R11: ffff8881daf2dbbb R12: ffff8881ceeaeac0 [ 59.955937] R13: ffff8881c0e789c0 R14: ffff8881c2df0d58 R15: ffff8881ceeaeac0 [ 59.963255] ? __bio_associate_blkg.isra.36+0x266/0x8f0 [ 59.968621] ? __bio_associate_blkg.isra.36+0x80b/0x8f0 [ 59.973993] ? __bio_associate_blkg.isra.36+0x80b/0x8f0 [ 59.979376] ? kasan_check_write+0x14/0x20 [ 59.983620] ? bio_init+0x139/0x260 [ 59.987258] ? bio_reset+0x510/0x510 [ 59.990984] ? mark_held_locks+0x130/0x130 [ 59.995307] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 60.000845] ? bio_alloc_bioset+0x2cc/0x6f0 [ 60.005165] ? mark_held_locks+0x130/0x130 [ 60.009406] ? bvec_alloc+0x2d0/0x2d0 [ 60.013247] __bio_clone_fast+0x412/0x5e0 [ 60.017425] bio_clone_fast+0x42/0x110 [ 60.021348] bio_split+0x86/0x260 [ 60.024804] blk_queue_split+0xa1e/0x2080 [ 60.028956] ? blk_queue_bounce+0x126/0x29b6 [ 60.033388] ? __blk_recalc_rq_segments+0xe20/0xe20 [ 60.038413] ? find_held_lock+0x36/0x1c0 [ 60.042480] ? graph_lock+0x270/0x270 [ 60.046291] ? ktime_get+0x332/0x400 [ 60.050042] ? find_held_lock+0x36/0x1c0 [ 60.054120] blk_mq_make_request+0x2e7/0x1e30 [ 60.058645] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 60.064192] ? check_preemption_disabled+0x48/0x280 [ 60.069215] ? blk_mq_try_issue_directly+0xaf0/0xaf0 [ 60.074326] ? __lock_is_held+0xb5/0x140 [ 60.078439] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 60.083992] ? trace_event_raw_event_block_rq_requeue+0x6f0/0x6f0 [ 60.090235] ? __set_page_dirty_buffers+0x810/0x810 [ 60.095267] ? ___might_sleep+0x1ed/0x300 [ 60.099418] ? ext4_mark_iloc_dirty+0x17a9/0x2f30 [ 60.104266] ? arch_local_save_flags+0x40/0x40 [ 60.108848] ? lock_downgrade+0x900/0x900 [ 60.113012] ? kasan_check_write+0x14/0x20 [ 60.117254] ? __brelse+0x104/0x180 [ 60.120889] ? block_commit_write+0x30/0x30 [ 60.125213] ? __ext4_handle_dirty_metadata+0x1e0/0x5a0 [ 60.130604] ? kasan_check_write+0x14/0x20 [ 60.134842] ? ext4_mark_iloc_dirty+0x199a/0x2f30 [ 60.139717] generic_make_request+0x9a5/0x1890 [ 60.144316] ? ___might_sleep+0x1ed/0x300 [ 60.148474] ? blk_queue_enter+0x11f0/0x11f0 [ 60.153106] ? other_inode_match+0xbb0/0xbb0 [ 60.157552] ? __might_sleep+0x95/0x190 [ 60.161540] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 60.167084] ? __ext4_journal_get_write_access+0x6d/0xa0 [ 60.172547] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 60.178091] ? ext4_reserve_inode_write+0x148/0x260 [ 60.183112] ? ext4_mark_inode_dirty+0x266/0xb20 [ 60.187880] ? ext4_expand_extra_isize+0x5b0/0x5b0 [ 60.192815] ? lock_release+0xa00/0xa00 [ 60.196812] submit_bio+0xba/0x460 [ 60.200356] ? submit_bio+0xba/0x460 [ 60.204076] ? generic_make_request+0x1890/0x1890 [ 60.208927] ? up_write+0x7b/0x220 [ 60.212491] ? down_write_nested+0x130/0x130 [ 60.216905] ? down_read+0x120/0x120 [ 60.220625] ext4_io_submit+0x197/0x230 [ 60.224601] ext4_writepages+0x1c4b/0x4190 [ 60.228863] ? ext4_mark_inode_dirty+0xb20/0xb20 [ 60.233633] ? graph_lock+0x240/0x270 [ 60.237450] ? print_usage_bug+0xc0/0xc0 [ 60.241546] ? __lock_acquire+0x62f/0x4c20 [ 60.245788] ? hctx_unlock+0xde/0x150 [ 60.249597] ? print_usage_bug+0xc0/0xc0 [ 60.253668] ? __lock_acquire+0x62f/0x4c20 [ 60.257910] ? mark_held_locks+0x130/0x130 [ 60.262144] ? __ext4_get_inode_loc+0x470/0x1330 [ 60.266928] ? mark_held_locks+0x130/0x130 [ 60.271172] ? graph_lock+0x270/0x270 [ 60.274976] ? kasan_check_write+0x14/0x20 [ 60.279230] ? __brelse+0x104/0x180 [ 60.282897] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 60.288915] ? check_preemption_disabled+0x48/0x280 [ 60.293946] ? ext4_mark_inode_dirty+0xb20/0xb20 [ 60.298715] do_writepages+0x9a/0x1a0 [ 60.302526] ? ext4_mark_inode_dirty+0xb20/0xb20 [ 60.307279] ? do_writepages+0x9a/0x1a0 [ 60.311271] __writeback_single_inode+0x20a/0x1660 [ 60.316208] ? __mark_inode_dirty+0x1510/0x1510 [ 60.320898] ? find_held_lock+0x36/0x1c0 [ 60.324973] ? find_held_lock+0x36/0x1c0 [ 60.329057] ? wbc_attach_and_unlock_inode+0x5c0/0xa30 [ 60.334338] ? lock_downgrade+0x900/0x900 [ 60.338490] ? find_held_lock+0x13f/0x1c0 [ 60.342693] ? kasan_check_read+0x11/0x20 [ 60.346865] ? do_raw_spin_unlock+0xa7/0x330 [ 60.351273] ? do_raw_spin_trylock+0x270/0x270 [ 60.355871] ? __lock_is_held+0xb5/0x140 [ 60.359979] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 60.365528] ? wbc_attach_and_unlock_inode+0x675/0xa30 [ 60.370811] ? __writeback_single_inode+0x1660/0x1660 [ 60.376018] writeback_sb_inodes+0x71f/0x1210 [ 60.380537] ? wbc_detach_inode+0x960/0x960 [ 60.384865] ? lock_release+0xa00/0xa00 [ 60.388861] ? down_read_trylock+0xda/0x140 [ 60.393189] ? trylock_super+0x22/0x110 [ 60.397183] ? downgrade_write+0x270/0x270 [ 60.401476] ? queue_io+0x3dd/0x800 [ 60.405124] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 60.410671] __writeback_inodes_wb+0x1b9/0x340 [ 60.415261] ? writeback_sb_inodes+0x1210/0x1210 [ 60.420015] ? __lock_is_held+0xb5/0x140 [ 60.424088] wb_writeback+0xa73/0xfc0 [ 60.427903] ? writeback_inodes_wb.constprop.50+0x330/0x330 [ 60.433637] ? widen_string+0xe0/0x2e0 [ 60.437572] ? __sanitizer_cov_trace_switch+0x53/0x90 [ 60.442768] ? print_usage_bug+0xc0/0xc0 [ 60.446836] ? string+0x225/0x2d0 [ 60.450314] ? widen_string+0x2e0/0x2e0 [ 60.454302] ? __sanitizer_cov_trace_cmp8+0x18/0x20 [ 60.459320] ? find_next_bit+0x104/0x130 [ 60.463433] ? __sanitizer_cov_trace_cmp8+0x18/0x20 [ 60.468450] ? find_next_bit+0x104/0x130 [ 60.472526] ? cpumask_next+0x41/0x50 [ 60.476335] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 60.481451] ? get_nr_dirty_inodes+0xd6/0x130 [ 60.485950] ? __local_bh_enable_ip+0x160/0x260 [ 60.490629] ? get_nr_dirty_pages+0x17c/0x1f0 [ 60.495131] ? _raw_spin_unlock_bh+0x30/0x40 [ 60.499549] ? inode_sleep_on_writeback+0x240/0x240 [ 60.504573] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 60.510121] ? check_preemption_disabled+0x48/0x280 [ 60.515140] ? wb_workfn+0x521/0x1790 [ 60.518948] ? wb_workfn+0x521/0x1790 [ 60.522765] ? __local_bh_enable_ip+0x160/0x260 [ 60.527443] wb_workfn+0x1008/0x1790 [ 60.531165] ? __lock_acquire+0x62f/0x4c20 [ 60.535415] ? inode_wait_for_writeback+0x40/0x40 [ 60.540265] ? mark_held_locks+0x130/0x130 [ 60.544497] ? graph_lock+0x270/0x270 [ 60.548322] ? graph_lock+0x270/0x270 [ 60.552129] ? lock_is_held_type+0x210/0x210 [ 60.556550] ? kvm_sched_clock_read+0x9/0x20 [ 60.560969] ? sched_clock+0x31/0x40 [ 60.564699] ? graph_lock+0x270/0x270 [ 60.568544] ? debug_object_deactivate+0x37d/0x480 [ 60.573493] ? lock_downgrade+0x900/0x900 [ 60.577655] ? find_held_lock+0x36/0x1c0 [ 60.581736] ? graph_lock+0x270/0x270 [ 60.585555] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 60.591100] ? check_preemption_disabled+0x48/0x280 [ 60.596135] ? __lock_is_held+0xb5/0x140 [ 60.600216] process_one_work+0xc90/0x1c40 [ 60.604455] ? mark_held_locks+0x130/0x130 [ 60.608705] ? pwq_dec_nr_in_flight+0x4a0/0x4a0 [ 60.613391] ? __bpf_trace_sched_wake_idle_without_ipi+0x10/0x10 [ 60.619544] ? __switch_to_asm+0x34/0x70 [ 60.623608] ? __switch_to_asm+0x34/0x70 [ 60.627671] ? __switch_to_asm+0x40/0x70 [ 60.631753] ? __switch_to_asm+0x34/0x70 [ 60.635829] ? __switch_to_asm+0x40/0x70 [ 60.639904] ? __switch_to_asm+0x34/0x70 [ 60.643963] ? __switch_to_asm+0x34/0x70 [ 60.648038] ? __switch_to_asm+0x34/0x70 [ 60.652115] ? __switch_to_asm+0x40/0x70 [ 60.656194] ? __switch_to_asm+0x34/0x70 [ 60.660254] ? __switch_to_asm+0x40/0x70 [ 60.664313] ? __switch_to_asm+0x34/0x70 [ 60.668396] ? __sched_text_start+0x8/0x8 [ 60.672546] ? graph_lock+0x270/0x270 [ 60.676349] ? lock_downgrade+0x900/0x900 [ 60.680527] ? lockdep_hardirqs_on+0x421/0x5c0 [ 60.685116] ? find_held_lock+0x36/0x1c0 [ 60.689186] ? lock_acquire+0x1ed/0x520 [ 60.693164] ? worker_thread+0x3e0/0x1390 [ 60.697324] ? kasan_check_write+0x14/0x20 [ 60.701592] ? do_raw_spin_lock+0x14f/0x350 [ 60.705914] ? __schedule+0x1ed0/0x1ed0 [ 60.709893] ? rwlock_bug.part.2+0x90/0x90 [ 60.714128] ? trace_hardirqs_on+0x310/0x310 [ 60.718563] worker_thread+0x17f/0x1390 [ 60.722559] ? __bpf_trace_sched_wake_idle_without_ipi+0x10/0x10 [ 60.728719] ? process_one_work+0x1c40/0x1c40 [ 60.733235] ? __schedule+0x9e6/0x1ed0 [ 60.737129] ? kmem_cache_alloc_trace+0x154/0x750 [ 60.741986] ? __sched_text_start+0x8/0x8 [ 60.746163] ? __kthread_parkme+0xce/0x1a0 [ 60.750417] ? _raw_spin_unlock_irqrestore+0x82/0xd0 [ 60.755527] ? _raw_spin_unlock_irqrestore+0x82/0xd0 [ 60.760635] ? lockdep_hardirqs_on+0x421/0x5c0 [ 60.765221] ? trace_hardirqs_on+0xbd/0x310 [ 60.769552] ? kasan_check_read+0x11/0x20 [ 60.773699] ? __kthread_parkme+0xce/0x1a0 [ 60.777948] ? __bpf_trace_preemptirq_template+0x30/0x30 [ 60.783406] ? __schedule+0x1ed0/0x1ed0 [ 60.787439] ? _raw_spin_unlock_irqrestore+0x6d/0xd0 [ 60.792558] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 60.798099] ? __kthread_parkme+0xfb/0x1a0 [ 60.802340] ? process_one_work+0x1c40/0x1c40 [ 60.806843] kthread+0x35a/0x440 [ 60.810220] ? kthread_bind+0x40/0x40 [ 60.814022] ret_from_fork+0x3a/0x50 [ 60.818936] Kernel Offset: disabled [ 60.822626] Rebooting in 86400 seconds..