[....] 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[ 19.375732] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 21.262353] random: sshd: uninitialized urandom read (32 bytes read) [ 21.582539] random: sshd: uninitialized urandom read (32 bytes read) [ 22.404966] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.57' (ECDSA) to the list of known hosts. [ 27.988269] random: sshd: uninitialized urandom read (32 bytes read) 2018/04/25 21:47:57 fuzzer started 2018/04/25 21:47:57 dialing manager at 10.128.0.26:42367 [ 32.852053] [ 32.853768] ============================= [ 32.857906] WARNING: suspicious RCU usage [ 32.862030] 4.17.0-rc2+ #16 Not tainted [ 32.865976] ----------------------------- [ 32.870096] include/linux/rcupdate.h:304 Illegal context switch in RCU read-side critical section! [ 32.879164] [ 32.879164] other info that might help us debug this: [ 32.879164] [ 32.887283] [ 32.887283] rcu_scheduler_active = 2, debug_locks = 1 [ 32.893926] 7 locks held by kworker/u4:3/825: [ 32.898391] #0: (ptrval) ((wq_completion)"writeback"){+.+.}, at: process_one_work+0xaef/0x1b50 [ 32.907920] #1: (ptrval) ((work_completion)(&(&wb->dwork)->work)){+.+.}, at: process_one_work+0xb46/0x1b50 [ 32.918486] #2: (ptrval) (&type->s_umount_key#29){++++}, at: trylock_super+0x22/0x110 [ 32.927235] #3: (ptrval) (&sbi->s_journal_flag_rwsem){.+.+}, at: do_writepages+0x9a/0x1a0 [ 32.936328] #4: (ptrval) (jbd2_handle){.+.+}, at: start_this_handle+0x581/0x1250 [ 32.944640] #5: (ptrval) (rcu_read_lock){....}, at: blk_account_io_start+0x166/0xde0 [ 32.953293] #6: (ptrval) (rcu_read_lock){....}, at: netif_receive_skb_internal+0xa2/0x7b0 [ 32.962405] [ 32.962405] stack backtrace: [ 32.966901] CPU: 1 PID: 825 Comm: kworker/u4:3 Not tainted 4.17.0-rc2+ #16 [ 32.973891] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 32.983239] Workqueue: writeback wb_workfn (flush-8:0) [ 32.988502] Call Trace: [ 32.991064] [ 32.993197] dump_stack+0x1b9/0x294 [ 32.996810] ? dump_stack_print_info.cold.2+0x52/0x52 [ 33.001978] ? print_lock+0xd1/0xd6 [ 33.005590] ? vprintk_func+0x81/0xe7 [ 33.009370] lockdep_rcu_suspicious+0x14a/0x153 [ 33.014019] ___might_sleep+0x26d/0x320 [ 33.017969] ? check_same_owner+0x320/0x320 [ 33.022267] ? lock_release+0xa10/0xa10 [ 33.026216] ? lock_downgrade+0x8e0/0x8e0 [ 33.030345] __might_sleep+0x95/0x190 [ 33.034126] __kmalloc+0x2b9/0x760 [ 33.037649] ? trace_hardirqs_off+0xd/0x10 [ 33.041863] ? _raw_write_unlock_irqrestore+0x63/0xc0 [ 33.047032] ? crng_reseed+0x427/0x920 [ 33.050906] crng_reseed+0x427/0x920 [ 33.054598] ? _extract_entropy.constprop.32+0x150/0x150 [ 33.060033] ? __lock_is_held+0xb5/0x140 [ 33.064078] credit_entropy_bits+0x98d/0xa30 [ 33.068467] ? add_interrupt_randomness+0x494/0x860 [ 33.073469] ? crng_reseed+0x920/0x920 [ 33.077334] ? lock_downgrade+0x8e0/0x8e0 [ 33.081459] ? __mix_pool_bytes+0xde/0x400 [ 33.085683] ? kasan_check_read+0x11/0x20 [ 33.089808] ? do_raw_spin_unlock+0x9e/0x2e0 [ 33.094192] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 33.098751] ? __handle_irq_event_percpu+0x34d/0xad0 [ 33.103841] add_interrupt_randomness+0x494/0x860 [ 33.108661] ? extract_entropy.constprop.29+0x490/0x490 [ 33.114003] ? lock_downgrade+0x8e0/0x8e0 [ 33.118129] ? handle_edge_irq+0x30/0x870 [ 33.122256] handle_irq_event_percpu+0xf9/0x1c0 [ 33.126907] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 33.131467] ? __handle_irq_event_percpu+0xad0/0xad0 [ 33.136549] ? ext4_io_submit+0x190/0x220 [ 33.140675] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 33.146190] handle_irq_event+0xa7/0x135 [ 33.150237] handle_edge_irq+0x20f/0x870 [ 33.154279] handle_irq+0x18c/0x2e7 [ 33.157886] do_IRQ+0x78/0x190 [ 33.161064] common_interrupt+0xf/0xf [ 33.164851] RIP: 0010:kmem_cache_alloc+0x283/0x760 [ 33.169755] RSP: 0018:ffff8801daf06800 EFLAGS: 00000286 ORIG_RAX: ffffffffffffffd9 [ 33.177441] RAX: 0000000000000007 RBX: 0000000001080020 RCX: 1ffff1003afae1c7 [ 33.184689] RDX: 0000000000000000 RSI: ffff8801d7d70e68 RDI: 0000000000000286 [ 33.191933] RBP: ffff8801daf06870 R08: ffff8801d7d70d78 R09: 0000000000000002 [ 33.199179] R10: ffff8801d7d70540 R11: 0000000000000000 R12: ffff8801d8a7adc0 [ 33.206430] R13: ffff8801d9a11080 R14: ffff8801d9a11080 R15: 0000000001080020 [ 33.213696] ? common_interrupt+0xa/0xf [ 33.217684] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 33.223219] skb_clone+0x1ed/0x4f0 [ 33.226742] ? skb_split+0x11d0/0x11d0 [ 33.230610] ? graph_lock+0x170/0x170 [ 33.234389] ? detach_buf+0x34d/0x5c0 [ 33.238170] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 33.243694] ? refcount_inc_not_zero+0x1dd/0x2d0 [ 33.248438] packet_rcv_spkt+0x59a/0x730 [ 33.252484] ? packet_poll+0x4c0/0x4c0 [ 33.256353] __netif_receive_skb_core+0x1435/0x3630 [ 33.261358] ? nf_ingress+0xa00/0xa00 [ 33.265141] ? __lock_acquire+0x7f5/0x5140 [ 33.269355] ? __lock_is_held+0xb5/0x140 [ 33.273402] ? debug_check_no_locks_freed+0x310/0x310 [ 33.278586] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 33.284103] ? graph_lock+0x170/0x170 [ 33.287910] ? print_usage_bug+0xc0/0xc0 [ 33.291953] ? lock_downgrade+0x8e0/0x8e0 [ 33.296088] ? pvclock_read_flags+0x160/0x160 [ 33.300560] ? mark_held_locks+0xc9/0x160 [ 33.304881] ? ktime_get_with_offset+0x395/0x4a0 [ 33.309620] ? lock_acquire+0x1dc/0x520 [ 33.313578] ? netif_receive_skb_internal+0xa2/0x7b0 [ 33.318663] ? kasan_check_read+0x11/0x20 [ 33.322789] ? rcu_is_watching+0x85/0x140 [ 33.326917] ? rcu_bh_force_quiescent_state+0x20/0x20 [ 33.332087] __netif_receive_skb+0x2c/0x1e0 [ 33.336388] netif_receive_skb_internal+0x126/0x7b0 [ 33.341383] ? dev_cpu_dead+0xad0/0xad0 [ 33.345334] ? net_rx_action+0x1930/0x1930 [ 33.349545] ? __lock_is_held+0xb5/0x140 [ 33.353595] ? __sanitizer_cov_trace_cmp8+0x18/0x20 [ 33.358589] ? __sanitizer_cov_trace_switch+0x53/0x90 [ 33.363757] napi_gro_receive+0x44d/0x5a0 [ 33.367896] ? dev_gro_receive+0x2250/0x2250 [ 33.372284] ? __sanitizer_cov_trace_const_cmp2+0x18/0x20 [ 33.377804] ? eth_type_trans+0x2e1/0x750 [ 33.381930] ? eth_gro_receive+0x8d0/0x8d0 [ 33.386143] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 33.391138] ? skb_partial_csum_set+0x245/0x2d0 [ 33.395788] receive_buf+0xc59/0x2750 [ 33.399569] ? print_usage_bug+0x11/0xc0 [ 33.403611] ? receive_mergeable+0x3130/0x3130 [ 33.408174] ? __lock_acquire+0x7f5/0x5140 [ 33.412385] ? graph_lock+0x170/0x170 [ 33.416166] ? __lock_acquire+0x7f5/0x5140 [ 33.420382] ? debug_check_no_locks_freed+0x310/0x310 [ 33.425548] ? __lock_is_held+0xb5/0x140 [ 33.429588] ? print_usage_bug+0xc0/0xc0 [ 33.433628] ? print_usage_bug+0xc0/0xc0 [ 33.437669] ? rcu_read_lock_sched_held+0x108/0x120 [ 33.442665] ? update_cfs_rq_load_avg.part.67+0x241/0x2c0 [ 33.448179] ? tg_unthrottle_up+0x220/0x220 [ 33.452480] ? __update_load_avg_cfs_rq.isra.35+0x435/0x590 [ 33.458184] ? __lock_acquire+0x7f5/0x5140 [ 33.462397] ? __lock_acquire+0x7f5/0x5140 [ 33.466612] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 33.472129] ? vring_use_dma_api+0xa5/0xc0 [ 33.476356] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 33.481878] ? vring_unmap_one+0x5a/0x410 [ 33.486005] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 33.491518] ? detach_buf+0x34d/0x5c0 [ 33.495300] ? __sanitizer_cov_trace_const_cmp2+0x18/0x20 [ 33.500814] ? virtqueue_get_buf_ctx+0x3dc/0x800 [ 33.505548] ? detach_buf+0x5c0/0x5c0 [ 33.509326] ? lock_downgrade+0x8e0/0x8e0 [ 33.513465] ? ___ratelimit.cold.2+0x6a/0x6a [ 33.517857] virtnet_poll+0x3c8/0xdb5 [ 33.521637] ? receive_buf+0x2750/0x2750 [ 33.525676] ? graph_lock+0x170/0x170 [ 33.529452] ? debug_check_no_locks_freed+0x310/0x310 [ 33.534623] ? trigger_load_balance+0x86a/0xaf0 [ 33.539271] ? mark_held_locks+0xc9/0x160 [ 33.543397] ? net_rx_action+0x46d/0x1930 [ 33.547524] net_rx_action+0x7b7/0x1930 [ 33.551482] ? napi_complete_done+0x6a0/0x6a0 [ 33.555954] ? mark_held_locks+0xc9/0x160 [ 33.560080] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 33.564639] ? print_usage_bug+0xc0/0xc0 [ 33.568680] ? _raw_spin_unlock_irq+0x27/0x70 [ 33.573152] ? print_usage_bug+0xc0/0xc0 [ 33.577197] ? trace_hardirqs_on_caller+0x19e/0x5c0 [ 33.582193] ? graph_lock+0x170/0x170 [ 33.585970] ? _raw_spin_unlock_irq+0x27/0x70 [ 33.590452] ? __run_timers+0xa2f/0xc50 [ 33.594406] ? __lock_acquire+0x7f5/0x5140 [ 33.598624] ? __lock_is_held+0xb5/0x140 [ 33.602667] ? debug_check_no_locks_freed+0x310/0x310 [ 33.607835] ? raise_softirq+0x450/0x450 [ 33.611873] ? debug_check_no_locks_freed+0x310/0x310 [ 33.617039] ? print_usage_bug+0xc0/0xc0 [ 33.621084] ? graph_lock+0x170/0x170 [ 33.624868] ? graph_lock+0x170/0x170 [ 33.628647] ? trace_hardirqs_off+0xd/0x10 [ 33.632860] ? __napi_schedule+0x284/0x390 [ 33.637071] ? rps_may_expire_flow+0x670/0x670 [ 33.641631] ? __lock_is_held+0xb5/0x140 [ 33.645678] ? print_usage_bug+0xc0/0xc0 [ 33.649719] ? graph_lock+0x170/0x170 [ 33.653507] ? __sanitizer_cov_trace_switch+0x53/0x90 [ 33.658673] ? graph_lock+0x170/0x170 [ 33.662452] ? __lock_is_held+0xb5/0x140 [ 33.666497] __do_softirq+0x2e0/0xaf5 [ 33.670279] ? __irqentry_text_end+0x1f98a8/0x1f98a8 [ 33.675362] ? kasan_check_read+0x11/0x20 [ 33.679491] ? do_raw_spin_unlock+0x9e/0x2e0 [ 33.683880] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 33.688456] ? _raw_spin_lock+0x32/0x40 [ 33.692412] ? _raw_spin_unlock+0x22/0x30 [ 33.696538] ? handle_edge_irq+0x330/0x870 [ 33.700758] irq_exit+0x1d1/0x200 [ 33.704188] do_IRQ+0xf1/0x190 [ 33.707360] common_interrupt+0xf/0xf [ 33.711136] [ 33.713355] RIP: 0010:blk_mq_queue_tag_busy_iter+0x2ee/0x9e0 [ 33.719131] RSP: 0018:ffff8801d7d7d118 EFLAGS: 00000287 ORIG_RAX: ffffffffffffffd9 [ 33.726817] RAX: 0000000000000000 RBX: 0000000000000080 RCX: ffffffff83421769 [ 33.734066] RDX: 0000000000000080 RSI: 0000000000000031 RDI: 0000000000000004 [ 33.741315] RBP: ffff8801d7d7d278 R08: ffff8801d7d70540 R09: ffffed003b5e46c2 [ 33.748567] R10: 0000000000000003 R11: 0000000000000006 R12: 0000000000002000 [ 33.755816] R13: 0000000000000031 R14: ffff8801d20c3a00 R15: dffffc0000000000 [ 33.763074] ? blk_mq_queue_tag_busy_iter+0x3c9/0x9e0 [ 33.768247] ? blk_mq_queue_tag_busy_iter+0x3c9/0x9e0 [ 33.773417] ? blk_mq_exit_hctx+0x3d0/0x3d0 [ 33.777809] ? graph_lock+0x170/0x170 [ 33.781594] ? blk_mq_put_tag+0x170/0x170 [ 33.785722] ? __lock_acquire+0x7f5/0x5140 [ 33.789937] ? find_next_zero_bit+0x111/0x140 [ 33.794413] ? blk_mq_exit_hctx+0x3d0/0x3d0 [ 33.798712] ? __sbitmap_get_word+0xed/0x100 [ 33.803109] blk_mq_in_flight+0x129/0x1b0 [ 33.807236] ? blk_mq_check_expired+0x810/0x810 [ 33.811884] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 33.816879] part_in_flight+0xdf/0x5a0 [ 33.820744] ? __lock_is_held+0xb5/0x140 [ 33.824784] ? part_dec_in_flight+0x130/0x130 [ 33.829274] ? find_held_lock+0x36/0x1c0 [ 33.833319] part_round_stats+0x1e3/0x770 [ 33.837446] ? blk_requeue_request+0x650/0x650 [ 33.842014] ? find_held_lock+0x36/0x1c0 [ 33.846056] blk_account_io_start+0x732/0xde0 [ 33.850536] ? blk_fetch_request+0x140/0x140 [ 33.854927] ? kasan_check_read+0x11/0x20 [ 33.859062] ? rcu_is_watching+0x85/0x140 [ 33.863192] ? rcu_bh_force_quiescent_state+0x20/0x20 [ 33.868375] blk_mq_bio_to_request+0x46e/0x930 [ 33.872936] ? blk_mq_hctx_notify_dead+0x9b0/0x9b0 [ 33.877854] ? __lock_is_held+0xb5/0x140 [ 33.881901] blk_mq_make_request+0x11bb/0x25c0 [ 33.886494] ? __blk_mq_insert_request+0x990/0x990 [ 33.891408] ? graph_lock+0x170/0x170 [ 33.895193] ? lock_downgrade+0x8e0/0x8e0 [ 33.899329] ? __lock_is_held+0xb5/0x140 [ 33.903374] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 33.908892] ? generic_make_request_checks+0x57a/0x2400 [ 33.914246] ? blk_init_queue+0x30/0x30 [ 33.918211] ? blk_queue_enter+0xcb5/0xf20 [ 33.922427] ? blk_exit_rl+0x80/0x80 [ 33.926136] ? lock_downgrade+0x8e0/0x8e0 [ 33.930266] ? kasan_check_read+0x11/0x20 [ 33.934392] ? rcu_is_watching+0x85/0x140 [ 33.938522] ? rcu_bh_force_quiescent_state+0x20/0x20 [ 33.943692] ? mark_held_locks+0xc9/0x160 [ 33.947832] generic_make_request+0x795/0x1510 [ 33.952395] ? __test_set_page_writeback+0x4ce/0x17e0 [ 33.957565] ? blk_get_request+0x40/0x40 [ 33.961616] ? write_one_page+0xac0/0xac0 [ 33.965745] ? find_get_pages_range+0x909/0x1200 [ 33.970482] ? find_held_lock+0x36/0x1c0 [ 33.974528] ? lock_downgrade+0x8e0/0x8e0 [ 33.978661] ? mark_held_locks+0xc9/0x160 [ 33.982791] submit_bio+0xba/0x460 [ 33.986308] ? submit_bio+0xba/0x460 [ 33.990003] ? generic_make_request+0x1510/0x1510 [ 33.994826] ? clear_page_dirty_for_io+0x383/0x1200 [ 33.999823] ext4_io_submit+0x190/0x220 [ 34.003780] ext4_bio_write_page+0x7de/0x1534 [ 34.008252] ? mark_held_locks+0xc9/0x160 [ 34.012382] ? ext4_io_submit_init+0x90/0x90 [ 34.016778] mpage_submit_page+0x15d/0x270 [ 34.021002] mpage_map_and_submit_buffers+0x52e/0x9b0 [ 34.026176] ? mpage_process_page_bufs+0x600/0x600 [ 34.031095] ext4_writepages+0x262b/0x4030 [ 34.035760] ? ext4_mark_inode_dirty+0xb20/0xb20 [ 34.040492] ? print_usage_bug+0xc0/0xc0 [ 34.044533] ? debug_check_no_locks_freed+0x310/0x310 [ 34.049703] ? print_usage_bug+0xc0/0xc0 [ 34.053876] ? __lock_is_held+0xb5/0x140 [ 34.057916] ? print_usage_bug+0xc0/0xc0 [ 34.061959] ? __lock_acquire+0x7f5/0x5140 [ 34.066173] ? mark_held_locks+0xc9/0x160 [ 34.070298] ? print_usage_bug+0xc0/0xc0 [ 34.074339] ? __lock_acquire+0x7f5/0x5140 [ 34.078558] ? debug_check_no_locks_freed+0x310/0x310 [ 34.083738] ? debug_check_no_locks_freed+0x310/0x310 [ 34.088907] ? graph_lock+0x170/0x170 [ 34.092698] ? ext4_mark_inode_dirty+0xb20/0xb20 [ 34.097436] do_writepages+0x9a/0x1a0 [ 34.101216] ? ext4_mark_inode_dirty+0xb20/0xb20 [ 34.105950] ? do_writepages+0x9a/0x1a0 [ 34.109916] __writeback_single_inode+0x1e4/0x15c0 [ 34.114827] ? __mark_inode_dirty+0x1530/0x1530 [ 34.119482] ? find_held_lock+0x36/0x1c0 [ 34.123523] ? lock_acquire+0x1dc/0x520 [ 34.127483] ? find_held_lock+0x36/0x1c0 [ 34.131528] ? lock_downgrade+0x8e0/0x8e0 [ 34.135655] ? find_held_lock+0x13f/0x1c0 [ 34.139782] ? kasan_check_read+0x11/0x20 [ 34.143907] ? do_raw_spin_unlock+0x9e/0x2e0 [ 34.148299] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 34.152866] ? __lock_is_held+0xb5/0x140 [ 34.156919] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 34.162444] ? wbc_attach_and_unlock_inode+0x643/0x9e0 [ 34.167704] ? __writeback_single_inode+0x15c0/0x15c0 [ 34.172873] ? kasan_check_write+0x14/0x20 [ 34.177085] ? do_raw_spin_lock+0xc1/0x200 [ 34.181301] writeback_sb_inodes+0x6f0/0x11a0 [ 34.185780] ? wbc_detach_inode+0x8e0/0x8e0 [ 34.190081] ? trace_hardirqs_on+0xd/0x10 [ 34.194222] ? down_read_trylock+0xf2/0x1d0 [ 34.198536] ? trylock_super+0x22/0x110 [ 34.202506] ? downgrade_write+0x290/0x290 [ 34.206724] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 34.212244] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 34.218048] __writeback_inodes_wb+0x1b0/0x320 [ 34.222629] ? writeback_sb_inodes+0x11a0/0x11a0 [ 34.227380] ? __lock_is_held+0xb5/0x140 [ 34.231457] wb_writeback+0x9e4/0xf50 [ 34.235274] ? writeback_inodes_wb.constprop.48+0x310/0x310 [ 34.240982] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 34.245981] ? __sanitizer_cov_trace_cmp8+0x18/0x20 [ 34.250980] ? format_decode+0xae0/0xae0 [ 34.255032] ? wb_update_bandwidth+0x1b0/0x1b0 [ 34.259597] ? graph_lock+0x170/0x170 [ 34.263384] ? string+0x21d/0x2c0 [ 34.266826] ? widen_string+0x2d0/0x2d0 [ 34.270782] ? __lock_acquire+0x7f5/0x5140 [ 34.274999] ? __sanitizer_cov_trace_cmp8+0x18/0x20 [ 34.280003] ? find_next_bit+0x104/0x130 [ 34.284055] ? __sanitizer_cov_trace_cmp8+0x18/0x20 [ 34.289049] ? find_next_bit+0x104/0x130 [ 34.293092] ? cpumask_next+0x24/0x30 [ 34.296871] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 34.301873] ? inode_sleep_on_writeback+0x220/0x220 [ 34.306870] ? trace_hardirqs_on+0xd/0x10 [ 34.310996] ? __local_bh_enable_ip+0x161/0x230 [ 34.315653] wb_workfn+0xd2f/0x1770 [ 34.319266] ? inode_wait_for_writeback+0x40/0x40 [ 34.324095] ? debug_check_no_locks_freed+0x310/0x310 [ 34.329264] ? rebalance_domains+0xd80/0xd80 [ 34.333669] ? find_held_lock+0x36/0x1c0 [ 34.337735] ? graph_lock+0x170/0x170 [ 34.341518] ? lock_acquire+0x1dc/0x520 [ 34.345473] ? graph_lock+0x170/0x170 [ 34.349252] ? lock_downgrade+0x8e0/0x8e0 [ 34.353378] ? graph_lock+0x170/0x170 [ 34.357161] ? find_held_lock+0x36/0x1c0 [ 34.361203] ? graph_lock+0x170/0x170 [ 34.364984] ? lock_downgrade+0x8e0/0x8e0 [ 34.369116] ? find_held_lock+0x36/0x1c0 [ 34.373156] ? graph_lock+0x170/0x170 [ 34.376942] ? _raw_spin_unlock_irqrestore+0x63/0xc0 [ 34.382034] ? __lock_is_held+0xb5/0x140 [ 34.386079] process_one_work+0xc1e/0x1b50 [ 34.390292] ? finish_task_switch+0x182/0x810 [ 34.394771] ? pwq_dec_nr_in_flight+0x490/0x490 [ 34.399425] ? __schedule+0x809/0x1e30 [ 34.403295] ? pick_next_task_fair+0x973/0x1660 [ 34.407944] ? graph_lock+0x170/0x170 [ 34.411721] ? find_held_lock+0x36/0x1c0 [ 34.415767] ? find_held_lock+0x36/0x1c0 [ 34.419808] ? lock_acquire+0x1dc/0x520 [ 34.423760] ? worker_thread+0x41f/0x1440 [ 34.427885] ? lock_downgrade+0x8e0/0x8e0 [ 34.432017] ? lock_release+0xa10/0xa10 [ 34.435978] ? kasan_check_read+0x11/0x20 [ 34.440108] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 34.444674] worker_thread+0x1cc/0x1440 [ 34.448631] ? process_one_work+0x1b50/0x1b50 [ 34.453115] ? graph_lock+0x170/0x170 [ 34.456912] ? find_held_lock+0x36/0x1c0 [ 34.460967] ? __schedule+0x1e30/0x1e30 [ 34.464928] ? do_raw_spin_unlock+0x9e/0x2e0 [ 34.469321] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 34.473883] ? _raw_spin_unlock_irqrestore+0x74/0xc0 [ 34.478963] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 34.483965] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 34.489485] ? __kthread_parkme+0x1b7/0x280 [ 34.493788] kthread+0x345/0x410 [ 34.497133] ? process_one_work+0x1b50/0x1b50 [ 34.501604] ? kthread_bind+0x40/0x40 [ 34.505382] ret_from_fork+0x3a/0x50 [ 34.509078] BUG: sleeping function called from invalid context at mm/slab.h:421 [ 34.516500] in_atomic(): 1, irqs_disabled(): 1, pid: 825, name: kworker/u4:3 [ 34.523662] 7 locks held by kworker/u4:3/825: [ 34.528130] #0: (ptrval) ((wq_completion)"writeback"){+.+.}, at: process_one_work+0xaef/0x1b50 [ 34.537654] #1: (ptrval) ((work_completion)(&(&wb->dwork)->work)){+.+.}, at: process_one_work+0xb46/0x1b50 [ 34.548219] #2: (ptrval) (&type->s_umount_key#29){++++}, at: trylock_super+0x22/0x110 [ 34.556970] #3: (ptrval) (&sbi->s_journal_flag_rwsem){.+.+}, at: do_writepages+0x9a/0x1a0 [ 34.566074] #4: (ptrval) (jbd2_handle){.+.+}, at: start_this_handle+0x581/0x1250 [ 34.574390] #5: (ptrval) (rcu_read_lock){....}, at: blk_account_io_start+0x166/0xde0 [ 34.583070] #6: (ptrval) (rcu_read_lock){....}, at: netif_receive_skb_internal+0xa2/0x7b0 [ 34.592171] irq event stamp: 97961 [ 34.595706] hardirqs last enabled at (97960): [] kmem_cache_alloc+0x26f/0x760 [ 34.604608] hardirqs last disabled at (97961): [] interrupt_entry+0xb5/0xf0 [ 34.613249] softirqs last enabled at (97094): [] __do_softirq+0x778/0xaf5 [ 34.621804] softirqs last disabled at (97099): [] irq_exit+0x1d1/0x200 [ 34.630019] CPU: 1 PID: 825 Comm: kworker/u4:3 Not tainted 4.17.0-rc2+ #16 [ 34.637013] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 34.646358] Workqueue: writeback wb_workfn (flush-8:0) [ 34.651614] Call Trace: [ 34.654174] [ 34.656307] dump_stack+0x1b9/0x294 [ 34.659916] ? dump_stack_print_info.cold.2+0x52/0x52 [ 34.665090] ? print_lock+0xd1/0xd6 [ 34.668695] ? irq_exit+0x1d1/0x200 [ 34.672300] ? irq_exit+0x1d1/0x200 [ 34.675908] ___might_sleep.cold.87+0x11f/0x13a [ 34.680560] ? check_same_owner+0x320/0x320 [ 34.684858] ? lock_release+0xa10/0xa10 [ 34.688817] ? lock_downgrade+0x8e0/0x8e0 [ 34.692947] __might_sleep+0x95/0x190 [ 34.696731] __kmalloc+0x2b9/0x760 [ 34.700251] ? trace_hardirqs_off+0xd/0x10 [ 34.704478] ? _raw_write_unlock_irqrestore+0x63/0xc0 [ 34.709647] ? crng_reseed+0x427/0x920 [ 34.713512] crng_reseed+0x427/0x920 [ 34.717215] ? _extract_entropy.constprop.32+0x150/0x150 [ 34.722660] ? __lock_is_held+0xb5/0x140 [ 34.726712] credit_entropy_bits+0x98d/0xa30 [ 34.731102] ? add_interrupt_randomness+0x494/0x860 [ 34.736097] ? crng_reseed+0x920/0x920 [ 34.739963] ? lock_downgrade+0x8e0/0x8e0 [ 34.744088] ? __mix_pool_bytes+0xde/0x400 [ 34.748311] ? kasan_check_read+0x11/0x20 [ 34.752440] ? do_raw_spin_unlock+0x9e/0x2e0 [ 34.756833] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 34.761396] ? __handle_irq_event_percpu+0x34d/0xad0 [ 34.766480] add_interrupt_randomness+0x494/0x860 [ 34.771304] ? extract_entropy.constprop.29+0x490/0x490 [ 34.776656] ? lock_downgrade+0x8e0/0x8e0 [ 34.780785] ? handle_edge_irq+0x30/0x870 [ 34.784922] handle_irq_event_percpu+0xf9/0x1c0 [ 34.789572] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 34.794146] ? __handle_irq_event_percpu+0xad0/0xad0 [ 34.799227] ? ext4_io_submit+0x190/0x220 [ 34.803356] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 34.808876] handle_irq_event+0xa7/0x135 [ 34.813098] handle_edge_irq+0x20f/0x870 [ 34.817143] handle_irq+0x18c/0x2e7 [ 34.820751] do_IRQ+0x78/0x190 [ 34.823922] common_interrupt+0xf/0xf [ 34.827711] RIP: 0010:kmem_cache_alloc+0x283/0x760 [ 34.832616] RSP: 0018:ffff8801daf06800 EFLAGS: 00000286 ORIG_RAX: ffffffffffffffd9 [ 34.840302] RAX: 0000000000000007 RBX: 0000000001080020 RCX: 1ffff1003afae1c7 [ 34.847549] RDX: 0000000000000000 RSI: ffff8801d7d70e68 RDI: 0000000000000286 [ 34.854796] RBP: ffff8801daf06870 R08: ffff8801d7d70d78 R09: 0000000000000002 [ 34.862045] R10: ffff8801d7d70540 R11: 0000000000000000 R12: ffff8801d8a7adc0 [ 34.869292] R13: ffff8801d9a11080 R14: ffff8801d9a11080 R15: 0000000001080020 [ 34.876547] ? common_interrupt+0xa/0xf [ 34.880517] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 34.886039] skb_clone+0x1ed/0x4f0 [ 34.889559] ? skb_split+0x11d0/0x11d0 [ 34.893427] ? graph_lock+0x170/0x170 [ 34.897207] ? detach_buf+0x34d/0x5c0 [ 34.900988] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 34.906508] ? refcount_inc_not_zero+0x1dd/0x2d0 [ 34.911250] packet_rcv_spkt+0x59a/0x730 [ 34.915291] ? packet_poll+0x4c0/0x4c0 [ 34.919160] __netif_receive_skb_core+0x1435/0x3630 [ 34.924160] ? nf_ingress+0xa00/0xa00 [ 34.927943] ? __lock_acquire+0x7f5/0x5140 [ 34.932153] ? __lock_is_held+0xb5/0x140 [ 34.936200] ? debug_check_no_locks_freed+0x310/0x310 [ 34.941372] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 34.946894] ? graph_lock+0x170/0x170 [ 34.950681] ? print_usage_bug+0xc0/0xc0 [ 34.954733] ? lock_downgrade+0x8e0/0x8e0 [ 34.958864] ? pvclock_read_flags+0x160/0x160 [ 34.963341] ? mark_held_locks+0xc9/0x160 [ 34.967472] ? ktime_get_with_offset+0x395/0x4a0 [ 34.972207] ? lock_acquire+0x1dc/0x520 [ 34.976170] ? netif_receive_skb_internal+0xa2/0x7b0 [ 34.981256] ? kasan_check_read+0x11/0x20 [ 34.985383] ? rcu_is_watching+0x85/0x140 [ 34.989511] ? rcu_bh_force_quiescent_state+0x20/0x20 [ 34.994684] __netif_receive_skb+0x2c/0x1e0 [ 34.998994] netif_receive_skb_internal+0x126/0x7b0 [ 35.003999] ? dev_cpu_dead+0xad0/0xad0 [ 35.007969] ? net_rx_action+0x1930/0x1930 [ 35.012185] ? __lock_is_held+0xb5/0x140 [ 35.016228] ? __sanitizer_cov_trace_cmp8+0x18/0x20 [ 35.021225] ? __sanitizer_cov_trace_switch+0x53/0x90 [ 35.026398] napi_gro_receive+0x44d/0x5a0 [ 35.030524] ? dev_gro_receive+0x2250/0x2250 [ 35.034918] ? __sanitizer_cov_trace_const_cmp2+0x18/0x20 [ 35.040436] ? eth_type_trans+0x2e1/0x750 [ 35.044564] ? eth_gro_receive+0x8d0/0x8d0 [ 35.048787] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 35.053782] ? skb_partial_csum_set+0x245/0x2d0 [ 35.058434] receive_buf+0xc59/0x2750 [ 35.062215] ? print_usage_bug+0x11/0xc0 [ 35.066254] ? receive_mergeable+0x3130/0x3130 [ 35.070818] ? __lock_acquire+0x7f5/0x5140 [ 35.075038] ? graph_lock+0x170/0x170 [ 35.078833] ? __lock_acquire+0x7f5/0x5140 [ 35.083052] ? debug_check_no_locks_freed+0x310/0x310 [ 35.088220] ? __lock_is_held+0xb5/0x140 [ 35.092261] ? print_usage_bug+0xc0/0xc0 [ 35.096302] ? print_usage_bug+0xc0/0xc0 [ 35.100351] ? rcu_read_lock_sched_held+0x108/0x120 [ 35.105351] ? update_cfs_rq_load_avg.part.67+0x241/0x2c0 [ 35.110868] ? tg_unthrottle_up+0x220/0x220 [ 35.115176] ? __update_load_avg_cfs_rq.isra.35+0x435/0x590 [ 35.120865] ? __lock_acquire+0x7f5/0x5140 [ 35.125081] ? __lock_acquire+0x7f5/0x5140 [ 35.129298] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 35.134815] ? vring_use_dma_api+0xa5/0xc0 [ 35.139038] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 35.144556] ? vring_unmap_one+0x5a/0x410 [ 35.148688] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 35.154202] ? detach_buf+0x34d/0x5c0 [ 35.157995] ? __sanitizer_cov_trace_const_cmp2+0x18/0x20 [ 35.163516] ? virtqueue_get_buf_ctx+0x3dc/0x800 [ 35.168253] ? detach_buf+0x5c0/0x5c0 [ 35.172040] ? lock_downgrade+0x8e0/0x8e0 [ 35.176175] ? ___ratelimit.cold.2+0x6a/0x6a [ 35.180567] virtnet_poll+0x3c8/0xdb5 [ 35.184358] ? receive_buf+0x2750/0x2750 [ 35.188397] ? graph_lock+0x170/0x170 [ 35.192176] ? debug_check_no_locks_freed+0x310/0x310 [ 35.197344] ? trigger_load_balance+0x86a/0xaf0 [ 35.201993] ? mark_held_locks+0xc9/0x160 [ 35.206127] ? net_rx_action+0x46d/0x1930 [ 35.210254] net_rx_action+0x7b7/0x1930 [ 35.214213] ? napi_complete_done+0x6a0/0x6a0 [ 35.218687] ? mark_held_locks+0xc9/0x160 [ 35.222816] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 35.227379] ? print_usage_bug+0xc0/0xc0 [ 35.231421] ? _raw_spin_unlock_irq+0x27/0x70 [ 35.235895] ? print_usage_bug+0xc0/0xc0 [ 35.239933] ? trace_hardirqs_on_caller+0x19e/0x5c0 [ 35.244928] ? graph_lock+0x170/0x170 [ 35.248710] ? _raw_spin_unlock_irq+0x27/0x70 [ 35.253193] ? __run_timers+0xa2f/0xc50 [ 35.257148] ? __lock_acquire+0x7f5/0x5140 [ 35.261363] ? __lock_is_held+0xb5/0x140 [ 35.265411] ? debug_check_no_locks_freed+0x310/0x310 [ 35.270586] ? raise_softirq+0x450/0x450 [ 35.274625] ? debug_check_no_locks_freed+0x310/0x310 [ 35.279792] ? print_usage_bug+0xc0/0xc0 [ 35.283830] ? graph_lock+0x170/0x170 [ 35.287619] ? graph_lock+0x170/0x170 [ 35.291404] ? trace_hardirqs_off+0xd/0x10 [ 35.295617] ? __napi_schedule+0x284/0x390 [ 35.299923] ? rps_may_expire_flow+0x670/0x670 [ 35.304487] ? __lock_is_held+0xb5/0x140 [ 35.308534] ? print_usage_bug+0xc0/0xc0 [ 35.312580] ? graph_lock+0x170/0x170 [ 35.316361] ? __sanitizer_cov_trace_switch+0x53/0x90 [ 35.321529] ? graph_lock+0x170/0x170 [ 35.325318] ? __lock_is_held+0xb5/0x140 [ 35.329371] __do_softirq+0x2e0/0xaf5 [ 35.333159] ? __irqentry_text_end+0x1f98a8/0x1f98a8 [ 35.338251] ? kasan_check_read+0x11/0x20 [ 35.342561] ? do_raw_spin_unlock+0x9e/0x2e0 [ 35.346949] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 35.351519] ? _raw_spin_lock+0x32/0x40 [ 35.355479] ? _raw_spin_unlock+0x22/0x30 [ 35.359608] ? handle_edge_irq+0x330/0x870 [ 35.363827] irq_exit+0x1d1/0x200 [ 35.367258] do_IRQ+0xf1/0x190 [ 35.370430] common_interrupt+0xf/0xf [ 35.374203] [ 35.376423] RIP: 0010:blk_mq_queue_tag_busy_iter+0x2ee/0x9e0 [ 35.382198] RSP: 0018:ffff8801d7d7d118 EFLAGS: 00000287 ORIG_RAX: ffffffffffffffd9 [ 35.389886] RAX: 0000000000000000 RBX: 0000000000000080 RCX: ffffffff83421769 [ 35.397132] RDX: 0000000000000080 RSI: 0000000000000031 RDI: 0000000000000004 [ 35.404380] RBP: ffff8801d7d7d278 R08: ffff8801d7d70540 R09: ffffed003b5e46c2 [ 35.411629] R10: 0000000000000003 R11: 0000000000000006 R12: 0000000000002000 [ 35.418878] R13: 0000000000000031 R14: ffff8801d20c3a00 R15: dffffc0000000000 [ 35.426141] ? blk_mq_queue_tag_busy_iter+0x3c9/0x9e0 [ 35.431311] ? blk_mq_queue_tag_busy_iter+0x3c9/0x9e0 [ 35.436479] ? blk_mq_exit_hctx+0x3d0/0x3d0 [ 35.440780] ? graph_lock+0x170/0x170 [ 35.444560] ? blk_mq_put_tag+0x170/0x170 [ 35.448687] ? __lock_acquire+0x7f5/0x5140 [ 35.452900] ? find_next_zero_bit+0x111/0x140 [ 35.457379] ? blk_mq_exit_hctx+0x3d0/0x3d0 [ 35.461681] ? __sbitmap_get_word+0xed/0x100 [ 35.466093] blk_mq_in_flight+0x129/0x1b0 [ 35.470224] ? blk_mq_check_expired+0x810/0x810 [ 35.474875] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 35.479871] part_in_flight+0xdf/0x5a0 [ 35.483745] ? __lock_is_held+0xb5/0x140 [ 35.487785] ? part_dec_in_flight+0x130/0x130 [ 35.492272] ? find_held_lock+0x36/0x1c0 [ 35.496316] part_round_stats+0x1e3/0x770 [ 35.500445] ? blk_requeue_request+0x650/0x650 [ 35.505012] ? find_held_lock+0x36/0x1c0 [ 35.509059] blk_account_io_start+0x732/0xde0 [ 35.513533] ? blk_fetch_request+0x140/0x140 [ 35.517923] ? kasan_check_read+0x11/0x20 [ 35.522051] ? rcu_is_watching+0x85/0x140 [ 35.526185] ? rcu_bh_force_quiescent_state+0x20/0x20 [ 35.531365] blk_mq_bio_to_request+0x46e/0x930 [ 35.535928] ? blk_mq_hctx_notify_dead+0x9b0/0x9b0 [ 35.540841] ? __lock_is_held+0xb5/0x140 [ 35.544886] blk_mq_make_request+0x11bb/0x25c0 [ 35.549454] ? __blk_mq_insert_request+0x990/0x990 [ 35.554367] ? graph_lock+0x170/0x170 [ 35.558148] ? lock_downgrade+0x8e0/0x8e0 [ 35.562277] ? __lock_is_held+0xb5/0x140 [ 35.566322] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 35.571841] ? generic_make_request_checks+0x57a/0x2400 [ 35.577185] ? blk_init_queue+0x30/0x30 [ 35.581139] ? blk_queue_enter+0xcb5/0xf20 [ 35.585363] ? blk_exit_rl+0x80/0x80 [ 35.589063] ? lock_downgrade+0x8e0/0x8e0 [ 35.593192] ? kasan_check_read+0x11/0x20 [ 35.597319] ? rcu_is_watching+0x85/0x140 [ 35.601456] ? rcu_bh_force_quiescent_state+0x20/0x20 [ 35.606632] ? mark_held_locks+0xc9/0x160 [ 35.610761] generic_make_request+0x795/0x1510 [ 35.615324] ? __test_set_page_writeback+0x4ce/0x17e0 [ 35.620494] ? blk_get_request+0x40/0x40 [ 35.624538] ? write_one_page+0xac0/0xac0 [ 35.628664] ? find_get_pages_range+0x909/0x1200 [ 35.633407] ? find_held_lock+0x36/0x1c0 [ 35.637451] ? lock_downgrade+0x8e0/0x8e0 [ 35.641594] ? mark_held_locks+0xc9/0x160 [ 35.645722] submit_bio+0xba/0x460 [ 35.649242] ? submit_bio+0xba/0x460 [ 35.652937] ? generic_make_request+0x1510/0x1510 [ 35.657762] ? clear_page_dirty_for_io+0x383/0x1200 [ 35.662760] ext4_io_submit+0x190/0x220 [ 35.666712] ext4_bio_write_page+0x7de/0x1534 [ 35.671184] ? mark_held_locks+0xc9/0x160 [ 35.675314] ? ext4_io_submit_init+0x90/0x90 [ 35.679705] mpage_submit_page+0x15d/0x270 [ 35.683924] mpage_map_and_submit_buffers+0x52e/0x9b0 [ 35.689098] ? mpage_process_page_bufs+0x600/0x600 [ 35.694030] ext4_writepages+0x262b/0x4030 [ 35.698255] ? ext4_mark_inode_dirty+0xb20/0xb20 [ 35.702988] ? print_usage_bug+0xc0/0xc0 [ 35.707036] ? debug_check_no_locks_freed+0x310/0x310 [ 35.712215] ? print_usage_bug+0xc0/0xc0 [ 35.716254] ? __lock_is_held+0xb5/0x140 [ 35.720293] ? print_usage_bug+0xc0/0xc0 [ 35.724335] ? __lock_acquire+0x7f5/0x5140 [ 35.728551] ? mark_held_locks+0xc9/0x160 [ 35.732685] ? print_usage_bug+0xc0/0xc0 [ 35.736727] ? __lock_acquire+0x7f5/0x5140 [ 35.740939] ? debug_check_no_locks_freed+0x310/0x310 [ 35.746111] ? debug_check_no_locks_freed+0x310/0x310 [ 35.751278] ? graph_lock+0x170/0x170 [ 35.755067] ? ext4_mark_inode_dirty+0xb20/0xb20 [ 35.759803] do_writepages+0x9a/0x1a0 [ 35.763585] ? ext4_mark_inode_dirty+0xb20/0xb20 [ 35.768320] ? do_writepages+0x9a/0x1a0 [ 35.772297] __writeback_single_inode+0x1e4/0x15c0 [ 35.777218] ? __mark_inode_dirty+0x1530/0x1530 [ 35.781866] ? find_held_lock+0x36/0x1c0 [ 35.785908] ? lock_acquire+0x1dc/0x520 [ 35.789860] ? find_held_lock+0x36/0x1c0 [ 35.793903] ? lock_downgrade+0x8e0/0x8e0 [ 35.798036] ? find_held_lock+0x13f/0x1c0 [ 35.802168] ? kasan_check_read+0x11/0x20 [ 35.806295] ? do_raw_spin_unlock+0x9e/0x2e0 [ 35.810682] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 35.815241] ? __lock_is_held+0xb5/0x140 [ 35.819285] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 35.824802] ? wbc_attach_and_unlock_inode+0x643/0x9e0 [ 35.830062] ? __writeback_single_inode+0x15c0/0x15c0 [ 35.835232] ? kasan_check_write+0x14/0x20 [ 35.839452] ? do_raw_spin_lock+0xc1/0x200 [ 35.843667] writeback_sb_inodes+0x6f0/0x11a0 [ 35.848148] ? wbc_detach_inode+0x8e0/0x8e0 [ 35.852464] ? trace_hardirqs_on+0xd/0x10 [ 35.856596] ? down_read_trylock+0xf2/0x1d0 [ 35.860914] ? trylock_super+0x22/0x110 [ 35.864868] ? downgrade_write+0x290/0x290 [ 35.869085] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 35.874606] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 35.880135] __writeback_inodes_wb+0x1b0/0x320 [ 35.884703] ? writeback_sb_inodes+0x11a0/0x11a0 [ 35.889439] ? __lock_is_held+0xb5/0x140 [ 35.893485] wb_writeback+0x9e4/0xf50 [ 35.897275] ? writeback_inodes_wb.constprop.48+0x310/0x310 [ 35.902965] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 35.907962] ? __sanitizer_cov_trace_cmp8+0x18/0x20 [ 35.912959] ? format_decode+0xae0/0xae0 [ 35.917570] ? wb_update_bandwidth+0x1b0/0x1b0 [ 35.922135] ? graph_lock+0x170/0x170 [ 35.925914] ? string+0x21d/0x2c0 [ 35.929346] ? widen_string+0x2d0/0x2d0 [ 35.933300] ? __lock_acquire+0x7f5/0x5140 [ 35.937515] ? __sanitizer_cov_trace_cmp8+0x18/0x20 [ 35.942522] ? find_next_bit+0x104/0x130 [ 35.946566] ? __sanitizer_cov_trace_cmp8+0x18/0x20 [ 35.951559] ? find_next_bit+0x104/0x130 [ 35.955600] ? cpumask_next+0x24/0x30 [ 35.959380] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 35.964381] ? inode_sleep_on_writeback+0x220/0x220 [ 35.969383] ? trace_hardirqs_on+0xd/0x10 [ 35.973517] ? __local_bh_enable_ip+0x161/0x230 [ 35.978166] wb_workfn+0xd2f/0x1770 [ 35.981778] ? inode_wait_for_writeback+0x40/0x40 [ 35.986610] ? debug_check_no_locks_freed+0x310/0x310 [ 35.991778] ? rebalance_domains+0xd80/0xd80 [ 35.996168] ? find_held_lock+0x36/0x1c0 [ 36.000213] ? graph_lock+0x170/0x170 [ 36.003992] ? lock_acquire+0x1dc/0x520 [ 36.007954] ? graph_lock+0x170/0x170 [ 36.011736] ? lock_downgrade+0x8e0/0x8e0 [ 36.015863] ? graph_lock+0x170/0x170 [ 36.019643] ? find_held_lock+0x36/0x1c0 [ 36.023689] ? graph_lock+0x170/0x170 [ 36.027476] ? lock_downgrade+0x8e0/0x8e0 [ 36.031607] ? find_held_lock+0x36/0x1c0 [ 36.035646] ? graph_lock+0x170/0x170 [ 36.039430] ? _raw_spin_unlock_irqrestore+0x63/0xc0 [ 36.044522] ? __lock_is_held+0xb5/0x140 [ 36.048566] process_one_work+0xc1e/0x1b50 [ 36.052782] ? finish_task_switch+0x182/0x810 [ 36.057261] ? pwq_dec_nr_in_flight+0x490/0x490 [ 36.061912] ? __schedule+0x809/0x1e30 [ 36.065782] ? pick_next_task_fair+0x973/0x1660 [ 36.070434] ? graph_lock+0x170/0x170 [ 36.074210] ? find_held_lock+0x36/0x1c0 [ 36.078254] ? find_held_lock+0x36/0x1c0 [ 36.082297] ? lock_acquire+0x1dc/0x520 [ 36.086266] ? worker_thread+0x41f/0x1440 [ 36.090396] ? lock_downgrade+0x8e0/0x8e0 [ 36.094523] ? lock_release+0xa10/0xa10 [ 36.098479] ? kasan_check_read+0x11/0x20 [ 36.102605] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 36.107185] worker_thread+0x1cc/0x1440 [ 36.111145] ? process_one_work+0x1b50/0x1b50 [ 36.115627] ? graph_lock+0x170/0x170 [ 36.119412] ? find_held_lock+0x36/0x1c0 [ 36.123459] ? __schedule+0x1e30/0x1e30 [ 36.127423] ? do_raw_spin_unlock+0x9e/0x2e0 [ 36.131810] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 36.136375] ? _raw_spin_unlock_irqrestore+0x74/0xc0 [ 36.141465] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 36.146461] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 36.151977] ? __kthread_parkme+0x1b7/0x280 [ 36.156279] kthread+0x345/0x410 [ 36.159623] ? process_one_work+0x1b50/0x1b50 [ 36.164182] ? kthread_bind+0x40/0x40 [ 36.167961] ret_from_fork+0x3a/0x50 [ 36.171849] random: crng init done