[info] Using makefile-style concurrent boot in runlevel 2.
[   26.340354] audit: type=1800 audit(1545381843.388:21): pid=5853 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="bootlogs" dev="sda1" ino=2419 res=0
[....] 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.

Debian GNU/Linux 7 syzkaller ttyS0

Warning: Permanently added '10.128.0.23' (ECDSA) to the list of known hosts.
2018/12/21 08:44:21 fuzzer started
2018/12/21 08:44:23 connecting to host at 10.128.0.26:38777
2018/12/21 08:44:23 checking revisions...
2018/12/21 08:44:23 testing simple program...
syzkaller login: [   46.618987] IPVS: ftp: loaded support on port[0] = 21
executing program
executing program
executing program
executing program
[   59.127135] WARNING: CPU: 0 PID: 21 at include/linux/blk-cgroup.h:518 __bio_associate_blkg.isra.36+0x80b/0x8f0
[   59.137522] Kernel panic - not syncing: panic_on_warn set ...
[   59.143439] CPU: 0 PID: 21 Comm: kworker/u4:1 Not tainted 4.20.0-rc7-next-20181221 #182
[   59.151588] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   59.160981] Workqueue: writeback wb_workfn (flush-8:0)
[   59.166277] Call Trace:
[   59.168887]  dump_stack+0x1d3/0x2c6
[   59.172542]  ? dump_stack_print_info.cold.1+0x20/0x20
[   59.177760]  panic+0x2ad/0x632
[   59.180970]  ? add_taint.cold.5+0x16/0x16
[   59.185136]  ? __warn.cold.8+0x5/0x4f
[   59.188949]  ? __warn+0xe8/0x1d0
[   59.192325]  ? __bio_associate_blkg.isra.36+0x80b/0x8f0
[   59.197701]  __warn.cold.8+0x20/0x4f
[   59.201427]  ? rcu_softirq_qs+0x20/0x20
[   59.205416]  ? __bio_associate_blkg.isra.36+0x80b/0x8f0
[   59.210792]  report_bug+0x254/0x2d0
[   59.214443]  do_error_trap+0x11b/0x200
[   59.218345]  do_invalid_op+0x36/0x40
[   59.222273]  ? __bio_associate_blkg.isra.36+0x80b/0x8f0
[   59.227651]  invalid_op+0x14/0x20
[   59.231124] RIP: 0010:__bio_associate_blkg.isra.36+0x80b/0x8f0
[   59.237111] 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
[   59.256036] RSP: 0000:ffff8881d942d738 EFLAGS: 00010293
[   59.261419] RAX: ffff8881d941e580 RBX: 0000000000000000 RCX: ffffffff83779576
[   59.268800] RDX: 0000000000000000 RSI: ffffffff83779b1b RDI: 0000000000000005
[   59.276083] RBP: ffff8881d942d8b8 R08: ffff8881d941e580 R09: ffffed103b5c5b77
[   59.283371] R10: ffffed103b5c5b77 R11: ffff8881dae2dbbb R12: ffff8881ceea4ac0
[   59.290661] R13: ffff8881c195ca40 R14: ffff8881c2954a58 R15: ffff8881ceea4ac0
[   59.297969]  ? __bio_associate_blkg.isra.36+0x266/0x8f0
[   59.303360]  ? __bio_associate_blkg.isra.36+0x80b/0x8f0
[   59.308752]  ? __bio_associate_blkg.isra.36+0x80b/0x8f0
[   59.314153]  ? kasan_check_write+0x14/0x20
[   59.318435]  ? bio_init+0x139/0x260
[   59.322082]  ? bio_reset+0x510/0x510
[   59.325817]  ? mark_held_locks+0x130/0x130
[   59.330085]  ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
[   59.335641]  ? bio_alloc_bioset+0x2cc/0x6f0
[   59.339985]  ? mark_held_locks+0x130/0x130
[   59.344244]  ? bvec_alloc+0x2d0/0x2d0
[   59.348069]  __bio_clone_fast+0x412/0x5e0
[   59.352239]  bio_clone_fast+0x42/0x110
[   59.356154]  bio_split+0x86/0x260
[   59.359622]  blk_queue_split+0xa1e/0x2080
[   59.363786]  ? blk_queue_bounce+0x126/0x29b6
[   59.368227]  ? __blk_recalc_rq_segments+0xe20/0xe20
[   59.373262]  ? find_held_lock+0x36/0x1c0
[   59.377343]  ? graph_lock+0x270/0x270
[   59.381176]  ? ktime_get+0x332/0x400
[   59.384909]  ? find_held_lock+0x36/0x1c0
[   59.388990]  blk_mq_make_request+0x2e7/0x1e30
[   59.393506]  ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
[   59.399057]  ? check_preemption_disabled+0x48/0x280
[   59.404092]  ? blk_mq_try_issue_directly+0xaf0/0xaf0
[   59.409215]  ? __lock_is_held+0xb5/0x140
[   59.413306]  ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20
[   59.418873]  ? trace_event_raw_event_block_rq_requeue+0x6f0/0x6f0
[   59.425123]  ? __set_page_dirty_buffers+0x810/0x810
[   59.430172]  ? ___might_sleep+0x1ed/0x300
[   59.434326]  ? ext4_mark_iloc_dirty+0x17a9/0x2f30
[   59.439183]  ? arch_local_save_flags+0x40/0x40
[   59.443769]  ? lock_downgrade+0x900/0x900
[   59.447937]  ? kasan_check_write+0x14/0x20
[   59.452187]  ? __brelse+0x104/0x180
[   59.455830]  ? block_commit_write+0x30/0x30
[   59.460179]  ? __ext4_handle_dirty_metadata+0x1e0/0x5a0
[   59.465560]  ? kasan_check_write+0x14/0x20
[   59.469806]  ? ext4_mark_iloc_dirty+0x199a/0x2f30
[   59.474670]  generic_make_request+0x9a5/0x1890
[   59.479261]  ? ___might_sleep+0x1ed/0x300
[   59.483428]  ? blk_queue_enter+0x11f0/0x11f0
[   59.487848]  ? other_inode_match+0xbb0/0xbb0
[   59.492270]  ? __might_sleep+0x95/0x190
[   59.496260]  ? __sanitizer_cov_trace_const_cmp8+0x18/0x20
[   59.501805]  ? __ext4_journal_get_write_access+0x6d/0xa0
[   59.507271]  ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
[   59.512820]  ? ext4_reserve_inode_write+0x148/0x260
[   59.517851]  ? ext4_mark_inode_dirty+0x266/0xb20
[   59.522646]  ? ext4_expand_extra_isize+0x5b0/0x5b0
[   59.527598]  ? lock_release+0xa00/0xa00
[   59.531594]  submit_bio+0xba/0x460
[   59.535152]  ? submit_bio+0xba/0x460
[   59.538876]  ? generic_make_request+0x1890/0x1890
[   59.543729]  ? up_write+0x7b/0x220
[   59.547284]  ? down_write_nested+0x130/0x130
[   59.551698]  ? down_read+0x120/0x120
[   59.555441]  ext4_io_submit+0x197/0x230
[   59.559437]  ext4_writepages+0x1c4b/0x4190
[   59.563719]  ? ext4_mark_inode_dirty+0xb20/0xb20
[   59.568475]  ? graph_lock+0x240/0x270
[   59.572281]  ? print_usage_bug+0xc0/0xc0
[   59.576382]  ? __lock_acquire+0x62f/0x4c20
[   59.580639]  ? hctx_unlock+0xde/0x150
[   59.584456]  ? print_usage_bug+0xc0/0xc0
[   59.588528]  ? __lock_acquire+0x62f/0x4c20
[   59.592787]  ? mark_held_locks+0x130/0x130
[   59.597034]  ? __ext4_get_inode_loc+0x470/0x1330
[   59.601804]  ? mark_held_locks+0x130/0x130
[   59.606045]  ? graph_lock+0x270/0x270
[   59.609853]  ? kasan_check_write+0x14/0x20
[   59.614098]  ? __brelse+0x104/0x180
[   59.617734]  ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
[   59.623286]  ? check_preemption_disabled+0x48/0x280
[   59.628323]  ? ext4_mark_inode_dirty+0xb20/0xb20
[   59.633097]  do_writepages+0x9a/0x1a0
[   59.636920]  ? ext4_mark_inode_dirty+0xb20/0xb20
[   59.641681]  ? do_writepages+0x9a/0x1a0
[   59.645672]  __writeback_single_inode+0x20a/0x1660
[   59.650624]  ? __mark_inode_dirty+0x1510/0x1510
[   59.655303]  ? find_held_lock+0x36/0x1c0
[   59.659382]  ? find_held_lock+0x36/0x1c0
[   59.663469]  ? wbc_attach_and_unlock_inode+0x5c0/0xa30
[   59.668755]  ? lock_downgrade+0x900/0x900
[   59.672917]  ? find_held_lock+0x13f/0x1c0
[   59.677080]  ? kasan_check_read+0x11/0x20
[   59.681240]  ? do_raw_spin_unlock+0xa7/0x330
[   59.685665]  ? do_raw_spin_trylock+0x270/0x270
[   59.690255]  ? __lock_is_held+0xb5/0x140
[   59.694343]  ? __sanitizer_cov_trace_const_cmp8+0x18/0x20
[   59.699904]  ? wbc_attach_and_unlock_inode+0x675/0xa30
[   59.705210]  ? __writeback_single_inode+0x1660/0x1660
[   59.710452]  writeback_sb_inodes+0x71f/0x1210
[   59.714983]  ? wbc_detach_inode+0x960/0x960
[   59.719320]  ? lock_release+0xa00/0xa00
[   59.723320]  ? down_read_trylock+0xda/0x140
[   59.727655]  ? trylock_super+0x22/0x110
[   59.731647]  ? downgrade_write+0x270/0x270
[   59.735894]  ? queue_io+0x3dd/0x800
[   59.739544]  ? __sanitizer_cov_trace_const_cmp8+0x18/0x20
[   59.745187]  __writeback_inodes_wb+0x1b9/0x340
[   59.749787]  ? writeback_sb_inodes+0x1210/0x1210
[   59.754552]  ? __lock_is_held+0xb5/0x140
[   59.758657]  wb_writeback+0xa73/0xfc0
[   59.762483]  ? writeback_inodes_wb.constprop.50+0x330/0x330
[   59.768300]  ? widen_string+0xe0/0x2e0
[   59.772206]  ? __sanitizer_cov_trace_switch+0x53/0x90
[   59.777415]  ? print_usage_bug+0xc0/0xc0
[   59.781486]  ? string+0x225/0x2d0
[   59.784957]  ? widen_string+0x2e0/0x2e0
[   59.788956]  ? __sanitizer_cov_trace_cmp8+0x18/0x20
[   59.793993]  ? find_next_bit+0x104/0x130
[   59.798076]  ? __sanitizer_cov_trace_cmp8+0x18/0x20
[   59.803105]  ? find_next_bit+0x104/0x130
[   59.807280]  ? cpumask_next+0x41/0x50
[   59.811090]  ? __sanitizer_cov_trace_cmp4+0x16/0x20
[   59.816120]  ? get_nr_dirty_inodes+0xd6/0x130
[   59.820641]  ? __local_bh_enable_ip+0x160/0x260
[   59.825339]  ? get_nr_dirty_pages+0x17c/0x1f0
[   59.829851]  ? _raw_spin_unlock_bh+0x30/0x40
[   59.834280]  ? inode_sleep_on_writeback+0x240/0x240
[   59.839323]  ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
[   59.844884]  ? check_preemption_disabled+0x48/0x280
[   59.849923]  ? wb_workfn+0x521/0x1790
[   59.853753]  ? wb_workfn+0x521/0x1790
[   59.857581]  ? __local_bh_enable_ip+0x160/0x260
[   59.862264]  wb_workfn+0x1008/0x1790
[   59.865990]  ? __lock_acquire+0x62f/0x4c20
[   59.870245]  ? inode_wait_for_writeback+0x40/0x40
[   59.875104]  ? mark_held_locks+0x130/0x130
[   59.879350]  ? graph_lock+0x270/0x270
[   59.883191]  ? graph_lock+0x270/0x270
[   59.887003]  ? lock_is_held_type+0x210/0x210
[   59.891430]  ? graph_lock+0x270/0x270
[   59.895245]  ? debug_object_deactivate+0x37d/0x480
[   59.900185]  ? lock_downgrade+0x900/0x900
[   59.904343]  ? find_held_lock+0x36/0x1c0
[   59.908414]  ? graph_lock+0x270/0x270
[   59.912231]  ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
[   59.917865]  ? check_preemption_disabled+0x48/0x280
[   59.922891]  ? __lock_is_held+0xb5/0x140
[   59.926968]  process_one_work+0xc90/0x1c40
[   59.931215]  ? mark_held_locks+0x130/0x130
[   59.935478]  ? pwq_dec_nr_in_flight+0x4a0/0x4a0
[   59.940175]  ? __bpf_trace_sched_wake_idle_without_ipi+0x10/0x10
[   59.946337]  ? __switch_to_asm+0x34/0x70
[   59.950414]  ? __switch_to_asm+0x34/0x70
[   59.954483]  ? __switch_to_asm+0x40/0x70
[   59.958550]  ? __switch_to_asm+0x34/0x70
[   59.962614]  ? __switch_to_asm+0x40/0x70
[   59.966680]  ? __switch_to_asm+0x34/0x70
[   59.970753]  ? __switch_to_asm+0x34/0x70
[   59.974817]  ? __switch_to_asm+0x40/0x70
[   59.978885]  ? __switch_to_asm+0x34/0x70
[   59.982952]  ? __switch_to_asm+0x40/0x70
[   59.987022]  ? __switch_to_asm+0x34/0x70
[   59.991094]  ? __switch_to_asm+0x40/0x70
[   59.995174]  ? __switch_to_asm+0x34/0x70
[   59.999263]  ? __sched_text_start+0x8/0x8
[   60.003419]  ? graph_lock+0x270/0x270
[   60.007230]  ? lock_downgrade+0x900/0x900
[   60.011400]  ? kasan_check_read+0x11/0x20
[   60.015562]  ? do_raw_spin_unlock+0xa7/0x330
[   60.019987]  ? find_held_lock+0x36/0x1c0
[   60.024064]  ? lock_acquire+0x1ed/0x520
[   60.028044]  ? worker_thread+0x3e0/0x1390
[   60.032214]  ? kasan_check_write+0x14/0x20
[   60.036459]  ? do_raw_spin_lock+0x14f/0x350
[   60.040789]  ? __schedule+0x1ed0/0x1ed0
[   60.044781]  ? rwlock_bug.part.2+0x90/0x90
[   60.049029]  ? trace_hardirqs_on+0x310/0x310
[   60.053582]  worker_thread+0x17f/0x1390
[   60.057570]  ? __bpf_trace_sched_wake_idle_without_ipi+0x10/0x10
[   60.063746]  ? process_one_work+0x1c40/0x1c40
[   60.068258]  ? __schedule+0x9e6/0x1ed0
[   60.072168]  ? __sched_text_start+0x8/0x8
[   60.076324]  ? __sched_text_start+0x8/0x8
[   60.080503]  ? __kthread_parkme+0xce/0x1a0
[   60.084749]  ? _raw_spin_unlock_irqrestore+0x82/0xd0
[   60.089859]  ? _raw_spin_unlock_irqrestore+0x82/0xd0
[   60.094970]  ? lockdep_hardirqs_on+0x421/0x5c0
[   60.099563]  ? trace_hardirqs_on+0xbd/0x310
[   60.103887]  ? kasan_check_read+0x11/0x20
[   60.108039]  ? __kthread_parkme+0xce/0x1a0
[   60.112463]  ? __bpf_trace_preemptirq_template+0x30/0x30
[   60.118026]  ? __schedule+0x1ed0/0x1ed0
[   60.122018]  ? _raw_spin_unlock_irqrestore+0x6d/0xd0
[   60.127145]  ? __sanitizer_cov_trace_const_cmp8+0x18/0x20
[   60.132700]  ? __kthread_parkme+0xfb/0x1a0
[   60.136954]  ? process_one_work+0x1c40/0x1c40
[   60.141460]  kthread+0x35a/0x440
[   60.144980]  ? kthread_bind+0x40/0x40
[   60.148793]  ret_from_fork+0x3a/0x50
[   60.154143] Kernel Offset: disabled
[   60.157867] Rebooting in 86400 seconds..