[....] 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. [ 28.617185] kauditd_printk_skb: 8 callbacks suppressed [ 28.617197] audit: type=1800 audit(1545395598.051:29): pid=5894 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 [ 28.649490] audit: type=1800 audit(1545395598.051:30): pid=5894 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 '10.128.0.43' (ECDSA) to the list of known hosts. 2018/12/21 12:33:29 fuzzer started 2018/12/21 12:33:30 connecting to host at 10.128.0.26:40685 2018/12/21 12:33:30 checking revisions... 2018/12/21 12:33:30 testing simple program... syzkaller login: [ 41.571008] IPVS: ftp: loaded support on port[0] = 21 executing program executing program executing program executing program executing program executing program [ 60.088828] WARNING: CPU: 1 PID: 21 at include/linux/blk-cgroup.h:518 __bio_associate_blkg.isra.36+0x80b/0x8f0 [ 60.099179] Kernel panic - not syncing: panic_on_warn set ... [ 60.105083] CPU: 1 PID: 21 Comm: kworker/u4:1 Not tainted 4.20.0-rc7-next-20181221 #183 [ 60.113217] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 60.122582] Workqueue: writeback wb_workfn (flush-8:0) [ 60.127856] Call Trace: [ 60.130465] dump_stack+0x1d3/0x2c6 [ 60.134101] ? dump_stack_print_info.cold.1+0x20/0x20 [ 60.139326] panic+0x2ad/0x632 [ 60.142531] ? add_taint.cold.5+0x16/0x16 [ 60.147181] ? __warn.cold.8+0x5/0x4f [ 60.150985] ? __warn+0xe8/0x1d0 [ 60.154364] ? __bio_associate_blkg.isra.36+0x80b/0x8f0 [ 60.159733] __warn.cold.8+0x20/0x4f [ 60.163450] ? rcu_softirq_qs+0x20/0x20 [ 60.167429] ? __bio_associate_blkg.isra.36+0x80b/0x8f0 [ 60.172804] report_bug+0x254/0x2d0 [ 60.176457] do_error_trap+0x11b/0x200 [ 60.180353] do_invalid_op+0x36/0x40 [ 60.184085] ? __bio_associate_blkg.isra.36+0x80b/0x8f0 [ 60.189450] invalid_op+0x14/0x20 [ 60.192899] RIP: 0010:__bio_associate_blkg.isra.36+0x80b/0x8f0 [ 60.198895] 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 [ 60.217794] RSP: 0018:ffff8881d942d738 EFLAGS: 00010293 [ 60.223169] RAX: ffff8881d941e580 RBX: 0000000000000000 RCX: ffffffff83779576 [ 60.230438] RDX: 0000000000000000 RSI: ffffffff83779b1b RDI: 0000000000000005 [ 60.237702] RBP: ffff8881d942d8b8 R08: ffff8881d941e580 R09: ffffed103b5e5b77 [ 60.244998] R10: ffffed103b5e5b77 R11: ffff8881daf2dbbb R12: ffff8881cee66ac0 [ 60.252267] R13: ffff8881c11f8a00 R14: ffff8881cc167d58 R15: ffff8881cee66ac0 [ 60.259553] ? __bio_associate_blkg.isra.36+0x266/0x8f0 [ 60.264919] ? __bio_associate_blkg.isra.36+0x80b/0x8f0 [ 60.270288] ? __bio_associate_blkg.isra.36+0x80b/0x8f0 [ 60.275655] ? kasan_check_write+0x14/0x20 [ 60.279891] ? bio_init+0x139/0x260 [ 60.283527] ? bio_reset+0x510/0x510 [ 60.287248] ? mark_held_locks+0x130/0x130 [ 60.291501] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 60.297038] ? bio_alloc_bioset+0x2cc/0x6f0 [ 60.301369] ? mark_held_locks+0x130/0x130 [ 60.305611] ? bvec_alloc+0x2d0/0x2d0 [ 60.309431] __bio_clone_fast+0x412/0x5e0 [ 60.313588] bio_clone_fast+0x42/0x110 [ 60.317474] bio_split+0x86/0x260 [ 60.320945] blk_queue_split+0xa1e/0x2080 [ 60.325094] ? blk_queue_bounce+0x126/0x29b6 [ 60.329533] ? __blk_recalc_rq_segments+0xe20/0xe20 [ 60.334553] ? find_held_lock+0x36/0x1c0 [ 60.338616] ? graph_lock+0x270/0x270 [ 60.342419] ? ktime_get+0x332/0x400 [ 60.346160] ? find_held_lock+0x36/0x1c0 [ 60.350258] blk_mq_make_request+0x2e7/0x1e30 [ 60.354792] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 60.360333] ? check_preemption_disabled+0x48/0x280 [ 60.365376] ? blk_mq_try_issue_directly+0xaf0/0xaf0 [ 60.370488] ? __lock_is_held+0xb5/0x140 [ 60.374564] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 60.380116] ? trace_event_raw_event_block_rq_requeue+0x6f0/0x6f0 [ 60.386396] ? __set_page_dirty_buffers+0x810/0x810 [ 60.391425] ? ___might_sleep+0x1ed/0x300 [ 60.395574] ? ext4_mark_iloc_dirty+0x17a9/0x2f30 [ 60.400416] ? arch_local_save_flags+0x40/0x40 [ 60.405012] ? lock_downgrade+0x900/0x900 [ 60.409644] ? kasan_check_write+0x14/0x20 [ 60.413887] ? __brelse+0x104/0x180 [ 60.417519] ? block_commit_write+0x30/0x30 [ 60.421844] ? __ext4_handle_dirty_metadata+0x1e0/0x5a0 [ 60.427215] ? kasan_check_write+0x14/0x20 [ 60.431452] ? ext4_mark_iloc_dirty+0x199a/0x2f30 [ 60.436309] generic_make_request+0x9a5/0x1890 [ 60.440907] ? ___might_sleep+0x1ed/0x300 [ 60.445062] ? blk_queue_enter+0x11f0/0x11f0 [ 60.449475] ? other_inode_match+0xbb0/0xbb0 [ 60.453891] ? __might_sleep+0x95/0x190 [ 60.457888] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 60.463456] ? __ext4_journal_get_write_access+0x6d/0xa0 [ 60.468911] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 60.474448] ? ext4_reserve_inode_write+0x148/0x260 [ 60.479467] ? ext4_mark_inode_dirty+0x266/0xb20 [ 60.484240] ? ext4_expand_extra_isize+0x5b0/0x5b0 [ 60.489170] ? lock_release+0xa00/0xa00 [ 60.493157] submit_bio+0xba/0x460 [ 60.496715] ? submit_bio+0xba/0x460 [ 60.500441] ? generic_make_request+0x1890/0x1890 [ 60.505303] ? up_write+0x7b/0x220 [ 60.508843] ? down_write_nested+0x130/0x130 [ 60.513253] ? down_read+0x120/0x120 [ 60.516979] ext4_io_submit+0x197/0x230 [ 60.520957] ext4_writepages+0x1c4b/0x4190 [ 60.525223] ? ext4_mark_inode_dirty+0xb20/0xb20 [ 60.529994] ? graph_lock+0x240/0x270 [ 60.533830] ? print_usage_bug+0xc0/0xc0 [ 60.537918] ? __lock_acquire+0x62f/0x4c20 [ 60.542172] ? hctx_unlock+0xde/0x150 [ 60.545978] ? print_usage_bug+0xc0/0xc0 [ 60.550068] ? __lock_acquire+0x62f/0x4c20 [ 60.554306] ? mark_held_locks+0x130/0x130 [ 60.558548] ? __ext4_get_inode_loc+0x470/0x1330 [ 60.563312] ? mark_held_locks+0x130/0x130 [ 60.567550] ? graph_lock+0x270/0x270 [ 60.571350] ? kasan_check_write+0x14/0x20 [ 60.575600] ? __brelse+0x104/0x180 [ 60.579238] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 60.584784] ? check_preemption_disabled+0x48/0x280 [ 60.589812] ? ext4_mark_inode_dirty+0xb20/0xb20 [ 60.594575] do_writepages+0x9a/0x1a0 [ 60.598385] ? ext4_mark_inode_dirty+0xb20/0xb20 [ 60.603147] ? do_writepages+0x9a/0x1a0 [ 60.607141] __writeback_single_inode+0x20a/0x1660 [ 60.612085] ? __mark_inode_dirty+0x1510/0x1510 [ 60.616761] ? find_held_lock+0x36/0x1c0 [ 60.620837] ? find_held_lock+0x36/0x1c0 [ 60.624913] ? wbc_attach_and_unlock_inode+0x5c0/0xa30 [ 60.630190] ? lock_downgrade+0x900/0x900 [ 60.634376] ? find_held_lock+0x13f/0x1c0 [ 60.638529] ? kasan_check_read+0x11/0x20 [ 60.642694] ? do_raw_spin_unlock+0xa7/0x330 [ 60.647103] ? do_raw_spin_trylock+0x270/0x270 [ 60.651705] ? __lock_is_held+0xb5/0x140 [ 60.655786] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 60.661332] ? wbc_attach_and_unlock_inode+0x675/0xa30 [ 60.666655] ? __writeback_single_inode+0x1660/0x1660 [ 60.671860] writeback_sb_inodes+0x71f/0x1210 [ 60.676400] ? wbc_detach_inode+0x960/0x960 [ 60.680726] ? lock_release+0xa00/0xa00 [ 60.684724] ? down_read_trylock+0xda/0x140 [ 60.689049] ? trylock_super+0x22/0x110 [ 60.693032] ? downgrade_write+0x270/0x270 [ 60.697280] ? queue_io+0x3dd/0x800 [ 60.700919] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 60.706466] __writeback_inodes_wb+0x1b9/0x340 [ 60.711060] ? writeback_sb_inodes+0x1210/0x1210 [ 60.715831] ? __lock_is_held+0xb5/0x140 [ 60.719940] wb_writeback+0xa73/0xfc0 [ 60.723755] ? writeback_inodes_wb.constprop.50+0x330/0x330 [ 60.729477] ? widen_string+0xe0/0x2e0 [ 60.733401] ? __sanitizer_cov_trace_switch+0x53/0x90 [ 60.738617] ? print_usage_bug+0xc0/0xc0 [ 60.742694] ? string+0x225/0x2d0 [ 60.746157] ? widen_string+0x2e0/0x2e0 [ 60.750147] ? __sanitizer_cov_trace_cmp8+0x18/0x20 [ 60.755167] ? find_next_bit+0x104/0x130 [ 60.759234] ? __sanitizer_cov_trace_cmp8+0x18/0x20 [ 60.764251] ? find_next_bit+0x104/0x130 [ 60.768319] ? cpumask_next+0x41/0x50 [ 60.772123] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 60.777171] ? get_nr_dirty_inodes+0xd6/0x130 [ 60.781667] ? __local_bh_enable_ip+0x160/0x260 [ 60.786343] ? get_nr_dirty_pages+0x17c/0x1f0 [ 60.790864] ? _raw_spin_unlock_bh+0x30/0x40 [ 60.795289] ? inode_sleep_on_writeback+0x240/0x240 [ 60.800314] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 60.805862] ? check_preemption_disabled+0x48/0x280 [ 60.810888] ? wb_workfn+0x521/0x1790 [ 60.814697] ? wb_workfn+0x521/0x1790 [ 60.818501] ? __local_bh_enable_ip+0x160/0x260 [ 60.823177] wb_workfn+0x1008/0x1790 [ 60.826934] ? __lock_acquire+0x62f/0x4c20 [ 60.831182] ? inode_wait_for_writeback+0x40/0x40 [ 60.836029] ? mark_held_locks+0x130/0x130 [ 60.840288] ? graph_lock+0x270/0x270 [ 60.844149] ? graph_lock+0x270/0x270 [ 60.847972] ? lock_is_held_type+0x210/0x210 [ 60.852417] ? debug_object_deactivate+0x37d/0x480 [ 60.857348] ? lock_downgrade+0x900/0x900 [ 60.861517] ? find_held_lock+0x36/0x1c0 [ 60.865585] ? graph_lock+0x270/0x270 [ 60.869413] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 60.874952] ? check_preemption_disabled+0x48/0x280 [ 60.879981] ? __lock_is_held+0xb5/0x140 [ 60.884059] process_one_work+0xc90/0x1c40 [ 60.888302] ? mark_held_locks+0x130/0x130 [ 60.892550] ? pwq_dec_nr_in_flight+0x4a0/0x4a0 [ 60.897239] ? __bpf_trace_sched_wake_idle_without_ipi+0x10/0x10 [ 60.903392] ? __switch_to_asm+0x34/0x70 [ 60.907459] ? __switch_to_asm+0x34/0x70 [ 60.911519] ? __switch_to_asm+0x40/0x70 [ 60.915580] ? __switch_to_asm+0x34/0x70 [ 60.919687] ? __switch_to_asm+0x40/0x70 [ 60.923758] ? __switch_to_asm+0x34/0x70 [ 60.927819] ? __switch_to_asm+0x34/0x70 [ 60.931884] ? __switch_to_asm+0x34/0x70 [ 60.935944] ? __switch_to_asm+0x40/0x70 [ 60.940003] ? __switch_to_asm+0x34/0x70 [ 60.944069] ? __switch_to_asm+0x40/0x70 [ 60.948140] ? __switch_to_asm+0x34/0x70 [ 60.952215] ? set_pf_worker+0x74/0xd0 [ 60.956118] ? __sched_text_start+0x8/0x8 [ 60.960270] ? graph_lock+0x270/0x270 [ 60.964088] ? find_held_lock+0x36/0x1c0 [ 60.968165] ? lock_acquire+0x1ed/0x520 [ 60.972165] ? worker_thread+0x3e0/0x1390 [ 60.976329] ? kasan_check_write+0x14/0x20 [ 60.980576] ? do_raw_spin_lock+0x14f/0x350 [ 60.984917] ? __schedule+0x1ed0/0x1ed0 [ 60.988901] ? rwlock_bug.part.2+0x90/0x90 [ 60.993147] ? trace_hardirqs_on+0x310/0x310 [ 60.997575] worker_thread+0x17f/0x1390 [ 61.001556] ? __bpf_trace_sched_wake_idle_without_ipi+0x10/0x10 [ 61.007719] ? process_one_work+0x1c40/0x1c40 [ 61.012223] ? __schedule+0x9e6/0x1ed0 [ 61.016276] ? __sched_text_start+0x8/0x8 [ 61.020432] ? __sched_text_start+0x8/0x8 [ 61.024604] ? __kthread_parkme+0xce/0x1a0 [ 61.028846] ? _raw_spin_unlock_irqrestore+0x82/0xd0 [ 61.033950] ? _raw_spin_unlock_irqrestore+0x82/0xd0 [ 61.039058] ? lockdep_hardirqs_on+0x421/0x5c0 [ 61.043667] ? trace_hardirqs_on+0xbd/0x310 [ 61.047997] ? kasan_check_read+0x11/0x20 [ 61.052151] ? __kthread_parkme+0xce/0x1a0 [ 61.056395] ? __bpf_trace_preemptirq_template+0x30/0x30 [ 61.061851] ? __schedule+0x1ed0/0x1ed0 [ 61.065852] ? _raw_spin_unlock_irqrestore+0x6d/0xd0 [ 61.070977] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 61.076514] ? __kthread_parkme+0xfb/0x1a0 [ 61.080759] ? process_one_work+0x1c40/0x1c40 [ 61.085256] kthread+0x35a/0x440 [ 61.088623] ? kthread_bind+0x40/0x40 [ 61.092429] ret_from_fork+0x3a/0x50 [ 61.097285] Kernel Offset: disabled [ 61.100991] Rebooting in 86400 seconds..