[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [ 28.213889] sshd (5946) used greatest stack depth: 15688 bytes left [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. [ 28.449570] kauditd_printk_skb: 8 callbacks suppressed [ 28.449581] audit: type=1800 audit(1545439028.172:29): pid=5879 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 [ 28.475349] audit: type=1800 audit(1545439028.172:30): pid=5879 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 '10.128.0.172' (ECDSA) to the list of known hosts. 2018/12/22 00:37:16 fuzzer started 2018/12/22 00:37:18 connecting to host at 10.128.0.26:43301 2018/12/22 00:37:18 checking revisions... 2018/12/22 00:37:18 testing simple program... syzkaller login: [ 38.617148] IPVS: ftp: loaded support on port[0] = 21 executing program executing program executing program executing program executing program executing program executing program [ 59.982723] WARNING: CPU: 1 PID: 7 at include/linux/blk-cgroup.h:518 __bio_associate_blkg.isra.36+0x80b/0x8f0 [ 59.992934] Kernel panic - not syncing: panic_on_warn set ... [ 59.998824] CPU: 1 PID: 7 Comm: kworker/u4:0 Not tainted 4.20.0-rc7-next-20181221 #184 [ 60.006876] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 60.016361] Workqueue: writeback wb_workfn (flush-8:0) [ 60.021641] Call Trace: [ 60.024237] dump_stack+0x1d3/0x2c6 [ 60.027877] ? dump_stack_print_info.cold.1+0x20/0x20 [ 60.033087] panic+0x2ad/0x632 [ 60.036291] ? add_taint.cold.5+0x16/0x16 [ 60.040449] ? __warn.cold.8+0x5/0x4f [ 60.044251] ? __warn+0xe8/0x1d0 [ 60.047631] ? __bio_associate_blkg.isra.36+0x80b/0x8f0 [ 60.053004] __warn.cold.8+0x20/0x4f [ 60.056739] ? rcu_softirq_qs+0x20/0x20 [ 60.060729] ? __bio_associate_blkg.isra.36+0x80b/0x8f0 [ 60.066114] report_bug+0x254/0x2d0 [ 60.069761] do_error_trap+0x11b/0x200 [ 60.073662] do_invalid_op+0x36/0x40 [ 60.077377] ? __bio_associate_blkg.isra.36+0x80b/0x8f0 [ 60.082756] invalid_op+0x14/0x20 [ 60.086213] RIP: 0010:__bio_associate_blkg.isra.36+0x80b/0x8f0 [ 60.092190] 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 [ 60.111092] RSP: 0018:ffff8881d9ac5738 EFLAGS: 00010293 [ 60.116455] RAX: ffff8881d9aba1c0 RBX: 0000000000000000 RCX: ffffffff83779576 [ 60.123723] RDX: 0000000000000000 RSI: ffffffff83779b1b RDI: 0000000000000005 [ 60.131006] RBP: ffff8881d9ac58b8 R08: ffff8881d9aba1c0 R09: ffffed103b5e5b77 [ 60.138278] R10: ffffed103b5e5b77 R11: ffff8881daf2dbbb R12: ffff8881cee80ac0 [ 60.145565] R13: ffff8881c12d89c0 R14: ffff8881c1d4cbd8 R15: ffff8881cee80ac0 [ 60.153387] ? __bio_associate_blkg.isra.36+0x266/0x8f0 [ 60.158788] ? __bio_associate_blkg.isra.36+0x80b/0x8f0 [ 60.164177] ? __bio_associate_blkg.isra.36+0x80b/0x8f0 [ 60.169542] ? kasan_check_write+0x14/0x20 [ 60.173811] ? bio_init+0x139/0x260 [ 60.177444] ? bio_reset+0x510/0x510 [ 60.181170] ? mark_held_locks+0x130/0x130 [ 60.185424] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 60.190968] ? bio_alloc_bioset+0x2cc/0x6f0 [ 60.195336] ? mark_held_locks+0x130/0x130 [ 60.199592] ? bvec_alloc+0x2d0/0x2d0 [ 60.203399] __bio_clone_fast+0x412/0x5e0 [ 60.207570] bio_clone_fast+0x42/0x110 [ 60.211493] bio_split+0x86/0x260 [ 60.214968] blk_queue_split+0xa1e/0x2080 [ 60.219122] ? blk_queue_bounce+0x126/0x29b6 [ 60.223550] ? __blk_recalc_rq_segments+0xe20/0xe20 [ 60.228573] ? find_held_lock+0x36/0x1c0 [ 60.232645] ? graph_lock+0x270/0x270 [ 60.236455] ? ktime_get+0x332/0x400 [ 60.240184] ? find_held_lock+0x36/0x1c0 [ 60.244258] blk_mq_make_request+0x2e7/0x1e30 [ 60.248811] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 60.254355] ? check_preemption_disabled+0x48/0x280 [ 60.259381] ? blk_mq_try_issue_directly+0xaf0/0xaf0 [ 60.264485] ? __lock_is_held+0xb5/0x140 [ 60.268569] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 60.274141] ? trace_event_raw_event_block_rq_requeue+0x6f0/0x6f0 [ 60.280403] ? __set_page_dirty_buffers+0x810/0x810 [ 60.285441] ? ___might_sleep+0x1ed/0x300 [ 60.289593] ? ext4_mark_iloc_dirty+0x17a9/0x2f30 [ 60.294457] ? arch_local_save_flags+0x40/0x40 [ 60.299038] ? lock_downgrade+0x900/0x900 [ 60.303200] ? kasan_check_write+0x14/0x20 [ 60.307439] ? __brelse+0x104/0x180 [ 60.311074] ? block_commit_write+0x30/0x30 [ 60.315402] ? __ext4_handle_dirty_metadata+0x1e0/0x5a0 [ 60.320783] ? kasan_check_write+0x14/0x20 [ 60.325026] ? ext4_mark_iloc_dirty+0x199a/0x2f30 [ 60.329887] generic_make_request+0x9a5/0x1890 [ 60.334472] ? ___might_sleep+0x1ed/0x300 [ 60.338631] ? blk_queue_enter+0x11f0/0x11f0 [ 60.343041] ? other_inode_match+0xbb0/0xbb0 [ 60.347456] ? __might_sleep+0x95/0x190 [ 60.351457] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 60.356999] ? __ext4_journal_get_write_access+0x6d/0xa0 [ 60.362457] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 60.367998] ? ext4_reserve_inode_write+0x148/0x260 [ 60.373024] ? ext4_mark_inode_dirty+0x266/0xb20 [ 60.377791] ? ext4_expand_extra_isize+0x5b0/0x5b0 [ 60.382723] ? lock_release+0xa00/0xa00 [ 60.386716] submit_bio+0xba/0x460 [ 60.390279] ? submit_bio+0xba/0x460 [ 60.394005] ? generic_make_request+0x1890/0x1890 [ 60.398857] ? up_write+0x7b/0x220 [ 60.402406] ? down_write_nested+0x130/0x130 [ 60.406845] ? down_read+0x120/0x120 [ 60.410567] ext4_io_submit+0x197/0x230 [ 60.414548] ext4_writepages+0x1c4b/0x4190 [ 60.418833] ? ext4_mark_inode_dirty+0xb20/0xb20 [ 60.423634] ? print_usage_bug+0xc0/0xc0 [ 60.427738] ? __lock_acquire+0x62f/0x4c20 [ 60.431989] ? print_usage_bug+0xc0/0xc0 [ 60.436052] ? update_load_avg+0x140e/0x2470 [ 60.440476] ? __lock_acquire+0x62f/0x4c20 [ 60.444727] ? mark_held_locks+0x130/0x130 [ 60.448973] ? __ext4_get_inode_loc+0x470/0x1330 [ 60.453754] ? mark_held_locks+0x130/0x130 [ 60.457993] ? graph_lock+0x270/0x270 [ 60.461800] ? kasan_check_write+0x14/0x20 [ 60.466040] ? __brelse+0x104/0x180 [ 60.469678] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 60.475257] ? check_preemption_disabled+0x48/0x280 [ 60.480306] ? ext4_mark_inode_dirty+0xb20/0xb20 [ 60.485100] do_writepages+0x9a/0x1a0 [ 60.488906] ? ext4_mark_inode_dirty+0xb20/0xb20 [ 60.493662] ? do_writepages+0x9a/0x1a0 [ 60.497654] __writeback_single_inode+0x20a/0x1660 [ 60.502593] ? __mark_inode_dirty+0x1510/0x1510 [ 60.507293] ? find_held_lock+0x36/0x1c0 [ 60.511366] ? find_held_lock+0x36/0x1c0 [ 60.515463] ? wbc_attach_and_unlock_inode+0x5c0/0xa30 [ 60.520740] ? lock_downgrade+0x900/0x900 [ 60.524942] ? find_held_lock+0x13f/0x1c0 [ 60.529110] ? kasan_check_read+0x11/0x20 [ 60.533281] ? do_raw_spin_unlock+0xa7/0x330 [ 60.537694] ? do_raw_spin_trylock+0x270/0x270 [ 60.542287] ? __lock_is_held+0xb5/0x140 [ 60.546364] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 60.551906] ? wbc_attach_and_unlock_inode+0x675/0xa30 [ 60.557191] ? __writeback_single_inode+0x1660/0x1660 [ 60.562440] writeback_sb_inodes+0x71f/0x1210 [ 60.567045] ? wbc_detach_inode+0x960/0x960 [ 60.571371] ? lock_release+0xa00/0xa00 [ 60.575364] ? down_read_trylock+0xda/0x140 [ 60.579693] ? trylock_super+0x22/0x110 [ 60.583671] ? downgrade_write+0x270/0x270 [ 60.587909] ? queue_io+0x3dd/0x800 [ 60.591537] ? __lock_is_held+0xb5/0x140 [ 60.595614] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 60.601164] __writeback_inodes_wb+0x1b9/0x340 [ 60.605805] ? writeback_sb_inodes+0x1210/0x1210 [ 60.610581] ? __lock_is_held+0xb5/0x140 [ 60.614663] wb_writeback+0xa73/0xfc0 [ 60.618492] ? writeback_inodes_wb.constprop.50+0x330/0x330 [ 60.624221] ? widen_string+0xe0/0x2e0 [ 60.628120] ? __sanitizer_cov_trace_switch+0x53/0x90 [ 60.633315] ? print_usage_bug+0xc0/0xc0 [ 60.637377] ? string+0x225/0x2d0 [ 60.640837] ? widen_string+0x2e0/0x2e0 [ 60.644820] ? __sanitizer_cov_trace_cmp8+0x18/0x20 [ 60.649857] ? find_next_bit+0x104/0x130 [ 60.653945] ? __sanitizer_cov_trace_cmp8+0x18/0x20 [ 60.658990] ? find_next_bit+0x104/0x130 [ 60.663058] ? cpumask_next+0x41/0x50 [ 60.666870] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 60.671894] ? get_nr_dirty_inodes+0xd6/0x130 [ 60.676391] ? __local_bh_enable_ip+0x160/0x260 [ 60.681069] ? get_nr_dirty_pages+0x17c/0x1f0 [ 60.685571] ? _raw_spin_unlock_bh+0x30/0x40 [ 60.689996] ? inode_sleep_on_writeback+0x240/0x240 [ 60.695020] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 60.700567] ? check_preemption_disabled+0x48/0x280 [ 60.705588] ? wb_workfn+0x521/0x1790 [ 60.709394] ? wb_workfn+0x521/0x1790 [ 60.713203] ? __local_bh_enable_ip+0x160/0x260 [ 60.717882] wb_workfn+0x1008/0x1790 [ 60.721599] ? __lock_acquire+0x62f/0x4c20 [ 60.725851] ? inode_wait_for_writeback+0x40/0x40 [ 60.730702] ? mark_held_locks+0x130/0x130 [ 60.734940] ? __lock_is_held+0xb5/0x140 [ 60.739024] ? update_load_avg+0x2470/0x2470 [ 60.743438] ? graph_lock+0x270/0x270 [ 60.747242] ? lock_is_held_type+0x210/0x210 [ 60.751673] ? graph_lock+0x270/0x270 [ 60.755490] ? debug_object_deactivate+0x37d/0x480 [ 60.760424] ? lock_downgrade+0x900/0x900 [ 60.764574] ? run_rebalance_domains+0x500/0x500 [ 60.769341] ? find_held_lock+0x36/0x1c0 [ 60.773425] ? graph_lock+0x270/0x270 [ 60.777240] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 60.782791] ? check_preemption_disabled+0x48/0x280 [ 60.787817] ? __lock_is_held+0xb5/0x140 [ 60.791896] process_one_work+0xc90/0x1c40 [ 60.796132] ? mark_held_locks+0x130/0x130 [ 60.800384] ? pwq_dec_nr_in_flight+0x4a0/0x4a0 [ 60.805058] ? __bpf_trace_sched_wake_idle_without_ipi+0x10/0x10 [ 60.811249] ? __switch_to_asm+0x34/0x70 [ 60.815345] ? __switch_to_asm+0x34/0x70 [ 60.819408] ? __switch_to_asm+0x40/0x70 [ 60.823474] ? __switch_to_asm+0x34/0x70 [ 60.827533] ? __switch_to_asm+0x40/0x70 [ 60.831593] ? __switch_to_asm+0x34/0x70 [ 60.835659] ? __switch_to_asm+0x34/0x70 [ 60.839723] ? __switch_to_asm+0x34/0x70 [ 60.843798] ? __switch_to_asm+0x40/0x70 [ 60.847858] ? __switch_to_asm+0x34/0x70 [ 60.851917] ? __switch_to_asm+0x40/0x70 [ 60.855978] ? __switch_to_asm+0x34/0x70 [ 60.860065] ? __sched_text_start+0x8/0x8 [ 60.864212] ? graph_lock+0x270/0x270 [ 60.868014] ? lock_downgrade+0x900/0x900 [ 60.872174] ? trace_hardirqs_off+0xb8/0x310 [ 60.876627] ? kasan_check_read+0x11/0x20 [ 60.880778] ? do_raw_spin_unlock+0xa7/0x330 [ 60.885194] ? find_held_lock+0x36/0x1c0 [ 60.889275] ? lock_acquire+0x1ed/0x520 [ 60.893281] ? worker_thread+0x3e0/0x1390 [ 60.897439] ? kasan_check_write+0x14/0x20 [ 60.901677] ? do_raw_spin_lock+0x14f/0x350 [ 60.906004] ? __schedule+0x1ed0/0x1ed0 [ 60.909985] ? rwlock_bug.part.2+0x90/0x90 [ 60.914235] ? trace_hardirqs_on+0x310/0x310 [ 60.918685] worker_thread+0x17f/0x1390 [ 60.922669] ? __bpf_trace_sched_wake_idle_without_ipi+0x10/0x10 [ 60.928832] ? process_one_work+0x1c40/0x1c40 [ 60.933347] ? __schedule+0x9e6/0x1ed0 [ 60.937246] ? __sched_text_start+0x8/0x8 [ 60.941401] ? __sched_text_start+0x8/0x8 [ 60.945572] ? __kthread_parkme+0xce/0x1a0 [ 60.949811] ? _raw_spin_unlock_irqrestore+0x82/0xd0 [ 60.954926] ? _raw_spin_unlock_irqrestore+0x82/0xd0 [ 60.960031] ? lockdep_hardirqs_on+0x421/0x5c0 [ 60.964616] ? trace_hardirqs_on+0xbd/0x310 [ 60.968939] ? kasan_check_read+0x11/0x20 [ 60.973091] ? __kthread_parkme+0xce/0x1a0 [ 60.977328] ? __bpf_trace_preemptirq_template+0x30/0x30 [ 60.982782] ? __schedule+0x1ed0/0x1ed0 [ 60.986778] ? _raw_spin_unlock_irqrestore+0x6d/0xd0 [ 60.991892] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 60.997433] ? __kthread_parkme+0xfb/0x1a0 [ 61.001693] ? process_one_work+0x1c40/0x1c40 [ 61.006201] kthread+0x35a/0x440 [ 61.009570] ? kthread_bind+0x40/0x40 [ 61.013379] ret_from_fork+0x3a/0x50 [ 61.018254] Kernel Offset: disabled [ 61.021954] Rebooting in 86400 seconds..