[....] 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. [ 28.330676] kauditd_printk_skb: 7 callbacks suppressed [ 28.330688] audit: type=1800 audit(1545439028.176:29): pid=5888 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 [ 28.364431] audit: type=1800 audit(1545439028.176:30): pid=5888 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 '10.128.0.171' (ECDSA) to the list of known hosts. 2018/12/22 00:37:15 fuzzer started 2018/12/22 00:37:17 connecting to host at 10.128.0.26:39053 2018/12/22 00:37:17 checking revisions... 2018/12/22 00:37:17 testing simple program... syzkaller login: [ 38.059761] IPVS: ftp: loaded support on port[0] = 21 executing program executing program executing program executing program executing program executing program executing program [ 59.775599] WARNING: CPU: 1 PID: 44 at include/linux/blk-cgroup.h:518 __bio_associate_blkg.isra.36+0x80b/0x8f0 [ 59.785985] Kernel panic - not syncing: panic_on_warn set ... [ 59.791876] CPU: 1 PID: 44 Comm: kworker/u4:2 Not tainted 4.20.0-rc7-next-20181221 #184 [ 59.800022] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 59.809433] Workqueue: writeback wb_workfn (flush-8:0) [ 59.814728] Call Trace: [ 59.817322] dump_stack+0x1d3/0x2c6 [ 59.820972] ? dump_stack_print_info.cold.1+0x20/0x20 [ 59.826179] panic+0x2ad/0x632 [ 59.829377] ? add_taint.cold.5+0x16/0x16 [ 59.833552] ? __warn.cold.8+0x5/0x4f [ 59.837369] ? __warn+0xe8/0x1d0 [ 59.840744] ? __bio_associate_blkg.isra.36+0x80b/0x8f0 [ 59.846115] __warn.cold.8+0x20/0x4f [ 59.849837] ? rcu_softirq_qs+0x20/0x20 [ 59.853816] ? __bio_associate_blkg.isra.36+0x80b/0x8f0 [ 59.859183] report_bug+0x254/0x2d0 [ 59.862818] do_error_trap+0x11b/0x200 [ 59.866712] do_invalid_op+0x36/0x40 [ 59.870439] ? __bio_associate_blkg.isra.36+0x80b/0x8f0 [ 59.875805] invalid_op+0x14/0x20 [ 59.879261] RIP: 0010:__bio_associate_blkg.isra.36+0x80b/0x8f0 [ 59.885233] 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 [ 59.904138] RSP: 0018:ffff8881d958d738 EFLAGS: 00010293 [ 59.909501] RAX: ffff8881d95a6400 RBX: 0000000000000000 RCX: ffffffff83779576 [ 59.916770] RDX: 0000000000000000 RSI: ffffffff83779b1b RDI: 0000000000000005 [ 59.924037] RBP: ffff8881d958d8b8 R08: ffff8881d95a6400 R09: ffffed103b5e5b77 [ 59.931308] R10: ffffed103b5e5b77 R11: ffff8881daf2dbbb R12: ffff8881ceeaa200 [ 59.938595] R13: ffff8881c16b8a00 R14: ffff8881c35d5ad8 R15: ffff8881ceeaa200 [ 59.945885] ? __bio_associate_blkg.isra.36+0x266/0x8f0 [ 59.951261] ? __bio_associate_blkg.isra.36+0x80b/0x8f0 [ 59.956634] ? __bio_associate_blkg.isra.36+0x80b/0x8f0 [ 59.962004] ? kasan_check_write+0x14/0x20 [ 59.966256] ? bio_init+0x139/0x260 [ 59.969890] ? bio_reset+0x510/0x510 [ 59.973619] ? mark_held_locks+0x130/0x130 [ 59.977868] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 59.983403] ? bio_alloc_bioset+0x2cc/0x6f0 [ 59.987730] ? mark_held_locks+0x130/0x130 [ 59.991970] ? bvec_alloc+0x2d0/0x2d0 [ 59.995775] __bio_clone_fast+0x412/0x5e0 [ 59.999967] bio_clone_fast+0x42/0x110 [ 60.003862] bio_split+0x86/0x260 [ 60.007324] blk_queue_split+0xa1e/0x2080 [ 60.011479] ? blk_queue_bounce+0x126/0x29b6 [ 60.015906] ? __blk_recalc_rq_segments+0xe20/0xe20 [ 60.020961] ? find_held_lock+0x36/0x1c0 [ 60.025028] ? graph_lock+0x270/0x270 [ 60.028839] ? ktime_get+0x332/0x400 [ 60.032567] ? find_held_lock+0x36/0x1c0 [ 60.036635] blk_mq_make_request+0x2e7/0x1e30 [ 60.041137] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 60.046682] ? check_preemption_disabled+0x48/0x280 [ 60.051705] ? blk_mq_try_issue_directly+0xaf0/0xaf0 [ 60.056826] ? __lock_is_held+0xb5/0x140 [ 60.061375] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 60.066955] ? trace_event_raw_event_block_rq_requeue+0x6f0/0x6f0 [ 60.073199] ? __set_page_dirty_buffers+0x810/0x810 [ 60.078228] ? ___might_sleep+0x1ed/0x300 [ 60.082397] ? ext4_mark_iloc_dirty+0x17a9/0x2f30 [ 60.087266] ? arch_local_save_flags+0x40/0x40 [ 60.091850] ? lock_downgrade+0x900/0x900 [ 60.096008] ? kasan_check_write+0x14/0x20 [ 60.100289] ? __brelse+0x104/0x180 [ 60.103933] ? block_commit_write+0x30/0x30 [ 60.108267] ? __ext4_handle_dirty_metadata+0x1e0/0x5a0 [ 60.113638] ? kasan_check_write+0x14/0x20 [ 60.117878] ? ext4_mark_iloc_dirty+0x199a/0x2f30 [ 60.122754] generic_make_request+0x9a5/0x1890 [ 60.127346] ? ___might_sleep+0x1ed/0x300 [ 60.131503] ? blk_queue_enter+0x11f0/0x11f0 [ 60.135922] ? other_inode_match+0xbb0/0xbb0 [ 60.140336] ? __might_sleep+0x95/0x190 [ 60.144334] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 60.149874] ? __ext4_journal_get_write_access+0x6d/0xa0 [ 60.155337] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 60.160894] ? ext4_reserve_inode_write+0x148/0x260 [ 60.165979] ? ext4_mark_inode_dirty+0x266/0xb20 [ 60.170748] ? ext4_expand_extra_isize+0x5b0/0x5b0 [ 60.175696] ? lock_release+0xa00/0xa00 [ 60.179683] submit_bio+0xba/0x460 [ 60.183225] ? submit_bio+0xba/0x460 [ 60.186951] ? generic_make_request+0x1890/0x1890 [ 60.191823] ? up_write+0x7b/0x220 [ 60.195371] ? down_write_nested+0x130/0x130 [ 60.199785] ? down_read+0x120/0x120 [ 60.203513] ext4_io_submit+0x197/0x230 [ 60.207496] ext4_writepages+0x1c4b/0x4190 [ 60.211769] ? ext4_mark_inode_dirty+0xb20/0xb20 [ 60.216531] ? graph_lock+0x240/0x270 [ 60.220336] ? print_usage_bug+0xc0/0xc0 [ 60.224436] ? __lock_acquire+0x62f/0x4c20 [ 60.228674] ? hctx_unlock+0xde/0x150 [ 60.232483] ? print_usage_bug+0xc0/0xc0 [ 60.236551] ? __lock_acquire+0x62f/0x4c20 [ 60.240789] ? mark_held_locks+0x130/0x130 [ 60.245039] ? __ext4_get_inode_loc+0x470/0x1330 [ 60.249808] ? mark_held_locks+0x130/0x130 [ 60.254050] ? graph_lock+0x270/0x270 [ 60.257857] ? kasan_check_write+0x14/0x20 [ 60.262095] ? __brelse+0x104/0x180 [ 60.265734] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 60.271278] ? check_preemption_disabled+0x48/0x280 [ 60.276307] ? ext4_mark_inode_dirty+0xb20/0xb20 [ 60.281074] do_writepages+0x9a/0x1a0 [ 60.284877] ? ext4_mark_inode_dirty+0xb20/0xb20 [ 60.289635] ? do_writepages+0x9a/0x1a0 [ 60.293636] __writeback_single_inode+0x20a/0x1660 [ 60.298581] ? __mark_inode_dirty+0x1510/0x1510 [ 60.303256] ? find_held_lock+0x36/0x1c0 [ 60.307350] ? find_held_lock+0x36/0x1c0 [ 60.311429] ? wbc_attach_and_unlock_inode+0x5c0/0xa30 [ 60.316708] ? lock_downgrade+0x900/0x900 [ 60.320878] ? find_held_lock+0x13f/0x1c0 [ 60.325032] ? kasan_check_read+0x11/0x20 [ 60.329184] ? do_raw_spin_unlock+0xa7/0x330 [ 60.333613] ? do_raw_spin_trylock+0x270/0x270 [ 60.338197] ? __lock_is_held+0xb5/0x140 [ 60.342337] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 60.347879] ? wbc_attach_and_unlock_inode+0x675/0xa30 [ 60.353163] ? __writeback_single_inode+0x1660/0x1660 [ 60.358387] writeback_sb_inodes+0x71f/0x1210 [ 60.362906] ? wbc_detach_inode+0x960/0x960 [ 60.367243] ? lock_release+0xa00/0xa00 [ 60.371241] ? down_read_trylock+0xda/0x140 [ 60.375572] ? trylock_super+0x22/0x110 [ 60.379567] ? downgrade_write+0x270/0x270 [ 60.383805] ? queue_io+0x3dd/0x800 [ 60.387467] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 60.393031] __writeback_inodes_wb+0x1b9/0x340 [ 60.397639] ? writeback_sb_inodes+0x1210/0x1210 [ 60.402398] ? __lock_is_held+0xb5/0x140 [ 60.406482] wb_writeback+0xa73/0xfc0 [ 60.410301] ? writeback_inodes_wb.constprop.50+0x330/0x330 [ 60.416022] ? widen_string+0xe0/0x2e0 [ 60.419954] ? kasan_check_write+0x14/0x20 [ 60.424235] ? __sanitizer_cov_trace_switch+0x53/0x90 [ 60.429436] ? print_usage_bug+0xc0/0xc0 [ 60.433498] ? string+0x225/0x2d0 [ 60.436960] ? widen_string+0x2e0/0x2e0 [ 60.440963] ? __sanitizer_cov_trace_cmp8+0x18/0x20 [ 60.445996] ? find_next_bit+0x104/0x130 [ 60.450074] ? __sanitizer_cov_trace_cmp8+0x18/0x20 [ 60.455097] ? find_next_bit+0x104/0x130 [ 60.459169] ? cpumask_next+0x41/0x50 [ 60.462989] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 60.468044] ? get_nr_dirty_inodes+0xd6/0x130 [ 60.472540] ? __local_bh_enable_ip+0x160/0x260 [ 60.477217] ? get_nr_dirty_pages+0x17c/0x1f0 [ 60.481722] ? _raw_spin_unlock_bh+0x30/0x40 [ 60.486138] ? inode_sleep_on_writeback+0x240/0x240 [ 60.491165] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 60.496712] ? check_preemption_disabled+0x48/0x280 [ 60.501753] ? wb_workfn+0x521/0x1790 [ 60.505558] ? wb_workfn+0x521/0x1790 [ 60.509360] ? __local_bh_enable_ip+0x160/0x260 [ 60.514058] wb_workfn+0x1008/0x1790 [ 60.517779] ? __lock_acquire+0x62f/0x4c20 [ 60.522027] ? inode_wait_for_writeback+0x40/0x40 [ 60.526877] ? mark_held_locks+0x130/0x130 [ 60.531127] ? __lock_is_held+0xb5/0x140 [ 60.535217] ? update_load_avg+0x2470/0x2470 [ 60.539629] ? graph_lock+0x270/0x270 [ 60.543438] ? lock_is_held_type+0x210/0x210 [ 60.547865] ? graph_lock+0x270/0x270 [ 60.551677] ? debug_object_deactivate+0x37d/0x480 [ 60.556616] ? lock_downgrade+0x900/0x900 [ 60.560766] ? run_rebalance_domains+0x500/0x500 [ 60.565532] ? find_held_lock+0x36/0x1c0 [ 60.569602] ? graph_lock+0x270/0x270 [ 60.573414] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 60.578960] ? check_preemption_disabled+0x48/0x280 [ 60.583986] ? __lock_is_held+0xb5/0x140 [ 60.588087] process_one_work+0xc90/0x1c40 [ 60.592327] ? mark_held_locks+0x130/0x130 [ 60.596576] ? pwq_dec_nr_in_flight+0x4a0/0x4a0 [ 60.601252] ? __bpf_trace_sched_wake_idle_without_ipi+0x10/0x10 [ 60.607431] ? __switch_to_asm+0x34/0x70 [ 60.611494] ? __switch_to_asm+0x34/0x70 [ 60.615551] ? __switch_to_asm+0x40/0x70 [ 60.619614] ? __switch_to_asm+0x34/0x70 [ 60.623674] ? __switch_to_asm+0x40/0x70 [ 60.627739] ? __switch_to_asm+0x34/0x70 [ 60.631804] ? __switch_to_asm+0x34/0x70 [ 60.635866] ? __switch_to_asm+0x34/0x70 [ 60.639939] ? __switch_to_asm+0x40/0x70 [ 60.644032] ? __switch_to_asm+0x34/0x70 [ 60.648094] ? __switch_to_asm+0x40/0x70 [ 60.652155] ? __switch_to_asm+0x34/0x70 [ 60.656241] ? __sched_text_start+0x8/0x8 [ 60.660387] ? graph_lock+0x270/0x270 [ 60.664188] ? lock_downgrade+0x900/0x900 [ 60.668346] ? kasan_check_read+0x11/0x20 [ 60.672498] ? do_raw_spin_unlock+0xa7/0x330 [ 60.676921] ? find_held_lock+0x36/0x1c0 [ 60.680993] ? lock_acquire+0x1ed/0x520 [ 60.684978] ? worker_thread+0x3e0/0x1390 [ 60.689134] ? kasan_check_write+0x14/0x20 [ 60.693372] ? do_raw_spin_lock+0x14f/0x350 [ 60.697693] ? __schedule+0x1ed0/0x1ed0 [ 60.701675] ? rwlock_bug.part.2+0x90/0x90 [ 60.705911] ? trace_hardirqs_on+0x310/0x310 [ 60.710365] worker_thread+0x17f/0x1390 [ 60.714343] ? __bpf_trace_sched_wake_idle_without_ipi+0x10/0x10 [ 60.720508] ? process_one_work+0x1c40/0x1c40 [ 60.725029] ? __schedule+0x9e6/0x1ed0 [ 60.728941] ? kmem_cache_alloc_trace+0x154/0x750 [ 60.733827] ? __sched_text_start+0x8/0x8 [ 60.738002] ? __kthread_parkme+0xce/0x1a0 [ 60.742257] ? _raw_spin_unlock_irqrestore+0x82/0xd0 [ 60.747361] ? _raw_spin_unlock_irqrestore+0x82/0xd0 [ 60.752469] ? lockdep_hardirqs_on+0x421/0x5c0 [ 60.757140] ? trace_hardirqs_on+0xbd/0x310 [ 60.761465] ? kasan_check_read+0x11/0x20 [ 60.765618] ? __kthread_parkme+0xce/0x1a0 [ 60.769855] ? __bpf_trace_preemptirq_template+0x30/0x30 [ 60.775315] ? __schedule+0x1ed0/0x1ed0 [ 60.779303] ? _raw_spin_unlock_irqrestore+0x6d/0xd0 [ 60.784417] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 60.789962] ? __kthread_parkme+0xfb/0x1a0 [ 60.794215] ? process_one_work+0x1c40/0x1c40 [ 60.798711] kthread+0x35a/0x440 [ 60.802081] ? kthread_bind+0x40/0x40 [ 60.805890] ret_from_fork+0x3a/0x50 [ 60.810672] Kernel Offset: disabled [ 60.814347] Rebooting in 86400 seconds..