dccp_invalid_packet: pskb_may_pull failed Buffer I/O error on dev loop0, logical block 3, async page read kworker/dying (1701) used greatest stack depth: 10072 bytes left INFO: task syz-executor6:22580 blocked for more than 120 seconds. Not tainted 4.16.0-rc6+ #366 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor6 D21408 22580 4241 0x00000004 Call Trace: context_switch kernel/sched/core.c:2862 [inline] __schedule+0x8fb/0x1ec0 kernel/sched/core.c:3440 schedule+0xf5/0x430 kernel/sched/core.c:3499 io_schedule+0x1c/0x70 kernel/sched/core.c:5115 wait_on_page_bit_common+0x4b3/0x770 mm/filemap.c:1099 wait_on_page_bit mm/filemap.c:1132 [inline] wait_on_page_writeback include/linux/pagemap.h:546 [inline] __filemap_fdatawait_range+0x282/0x430 mm/filemap.c:533 filemap_fdatawait_keep_errors+0x2a/0xb0 mm/filemap.c:600 fdatawait_one_bdev+0x50/0x70 fs/sync.c:95 iterate_bdevs+0x109/0x260 fs/block_dev.c:2162 sys_sync+0x120/0x1c0 fs/sync.c:117 do_syscall_64+0x281/0x940 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x454879 RSP: 002b:00007effc1640c68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2 RAX: ffffffffffffffda RBX: 00007effc16416d4 RCX: 0000000000454879 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000626 R14: 00000000006fa430 R15: 0000000000000000 Showing all locks held in the system: 2 locks held by khungtaskd/801: #0: (rcu_read_lock){....}, at: [<0000000074539522>] check_hung_uninterruptible_tasks kernel/hung_task.c:175 [inline] #0: (rcu_read_lock){....}, at: [<0000000074539522>] watchdog+0x1c5/0xd60 kernel/hung_task.c:249 #1: (tasklist_lock){.+.+}, at: [<00000000e31f23e1>] debug_show_all_locks+0xd3/0x3d0 kernel/locking/lockdep.c:4470 1 lock held by rsyslogd/4071: #0: (&f->f_pos_lock){+.+.}, at: [<00000000cf7cd026>] __fdget_pos+0x12b/0x190 fs/file.c:765 2 locks held by getty/4161: #0: (&tty->ldisc_sem){++++}, at: [<00000000919180ac>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000d5cabbc3>] n_tty_read+0x2ef/0x1a40 drivers/tty/n_tty.c:2131 2 locks held by getty/4162: #0: (&tty->ldisc_sem){++++}, at: [<00000000919180ac>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000d5cabbc3>] n_tty_read+0x2ef/0x1a40 drivers/tty/n_tty.c:2131 2 locks held by getty/4163: #0: (&tty->ldisc_sem){++++}, at: [<00000000919180ac>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000d5cabbc3>] n_tty_read+0x2ef/0x1a40 drivers/tty/n_tty.c:2131 2 locks held by getty/4164: #0: (&tty->ldisc_sem){++++}, at: [<00000000919180ac>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000d5cabbc3>] n_tty_read+0x2ef/0x1a40 drivers/tty/n_tty.c:2131 2 locks held by getty/4165: #0: (&tty->ldisc_sem){++++}, at: [<00000000919180ac>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000d5cabbc3>] n_tty_read+0x2ef/0x1a40 drivers/tty/n_tty.c:2131 2 locks held by getty/4166: #0: (&tty->ldisc_sem){++++}, at: [<00000000919180ac>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000d5cabbc3>] n_tty_read+0x2ef/0x1a40 drivers/tty/n_tty.c:2131 2 locks held by getty/4167: #0: (&tty->ldisc_sem){++++}, at: [<00000000919180ac>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000d5cabbc3>] n_tty_read+0x2ef/0x1a40 drivers/tty/n_tty.c:2131 4 locks held by kworker/0:4/8589: #0: ((wq_completion)"memcg_kmem_cache"){+.+.}, at: [<000000008c61eb60>] work_static include/linux/workqueue.h:198 [inline] #0: ((wq_completion)"memcg_kmem_cache"){+.+.}, at: [<000000008c61eb60>] set_work_data kernel/workqueue.c:619 [inline] #0: ((wq_completion)"memcg_kmem_cache"){+.+.}, at: [<000000008c61eb60>] set_work_pool_and_clear_pending kernel/workqueue.c:646 [inline] #0: ((wq_completion)"memcg_kmem_cache"){+.+.}, at: [<000000008c61eb60>] process_one_work+0xb12/0x1bb0 kernel/workqueue.c:2084 #1: ((work_completion)(&cw->work)){+.+.}, at: [<00000000ac1be4ef>] process_one_work+0xb89/0x1bb0 kernel/workqueue.c:2088 #2: (cpu_hotplug_lock.rw_sem){++++}, at: [<0000000095f08bf1>] get_online_cpus include/linux/cpu.h:124 [inline] #2: (cpu_hotplug_lock.rw_sem){++++}, at: [<0000000095f08bf1>] memcg_create_kmem_cache+0x16/0x170 mm/slab_common.c:619 #3: (slab_mutex){+.+.}, at: [<00000000e4e36811>] memcg_create_kmem_cache+0x24/0x170 mm/slab_common.c:622 3 locks held by kworker/1:8/9253: #0: ((wq_completion)"events"){+.+.}, at: [<000000008c61eb60>] work_static include/linux/workqueue.h:198 [inline] #0: ((wq_completion)"events"){+.+.}, at: [<000000008c61eb60>] set_work_data kernel/workqueue.c:619 [inline] #0: ((wq_completion)"events"){+.+.}, at: [<000000008c61eb60>] set_work_pool_and_clear_pending kernel/workqueue.c:646 [inline] #0: ((wq_completion)"events"){+.+.}, at: [<000000008c61eb60>] process_one_work+0xb12/0x1bb0 kernel/workqueue.c:2084 #1: (slab_caches_to_rcu_destroy_work){+.+.}, at: [<00000000ac1be4ef>] process_one_work+0xb89/0x1bb0 kernel/workqueue.c:2088 #2: (slab_mutex){+.+.}, at: [<000000008b365c42>] slab_caches_to_rcu_destroy_workfn+0x25/0xc0 mm/slab_common.c:556 3 locks held by kworker/u4:6/13297: #0: ((wq_completion)"writeback"){+.+.}, at: [<000000008c61eb60>] work_static include/linux/workqueue.h:198 [inline] #0: ((wq_completion)"writeback"){+.+.}, at: [<000000008c61eb60>] set_work_data kernel/workqueue.c:619 [inline] #0: ((wq_completion)"writeback"){+.+.}, at: [<000000008c61eb60>] set_work_pool_and_clear_pending kernel/workqueue.c:646 [inline] #0: ((wq_completion)"writeback"){+.+.}, at: [<000000008c61eb60>] process_one_work+0xb12/0x1bb0 kernel/workqueue.c:2084 #1: ((work_completion)(&(&wb->dwork)->work)){+.+.}, at: [<00000000ac1be4ef>] process_one_work+0xb89/0x1bb0 kernel/workqueue.c:2088 #2: (&type->s_umount_key#33){++++}, at: [<000000008432dc8b>] trylock_super+0x20/0x100 fs/super.c:395 4 locks held by kworker/1:13/16322: #0: ((wq_completion)"memcg_kmem_cache"){+.+.}, at: [<000000008c61eb60>] work_static include/linux/workqueue.h:198 [inline] #0: ((wq_completion)"memcg_kmem_cache"){+.+.}, at: [<000000008c61eb60>] set_work_data kernel/workqueue.c:619 [inline] #0: ((wq_completion)"memcg_kmem_cache"){+.+.}, at: [<000000008c61eb60>] set_work_pool_and_clear_pending kernel/workqueue.c:646 [inline] #0: ((wq_completion)"memcg_kmem_cache"){+.+.}, at: [<000000008c61eb60>] process_one_work+0xb12/0x1bb0 kernel/workqueue.c:2084 #1: ((work_completion)(&cw->work)){+.+.}, at: [<00000000ac1be4ef>] process_one_work+0xb89/0x1bb0 kernel/workqueue.c:2088 #2: (cpu_hotplug_lock.rw_sem){++++}, at: [<0000000095f08bf1>] get_online_cpus include/linux/cpu.h:124 [inline] #2: (cpu_hotplug_lock.rw_sem){++++}, at: [<0000000095f08bf1>] memcg_create_kmem_cache+0x16/0x170 mm/slab_common.c:619 #3: (slab_mutex){+.+.}, at: [<00000000e4e36811>] memcg_create_kmem_cache+0x24/0x170 mm/slab_common.c:622 4 locks held by kworker/1:18/16596: #0: ((wq_completion)"cgroup_destroy"){+.+.}, at: [<000000008c61eb60>] work_static include/linux/workqueue.h:198 [inline] #0: ((wq_completion)"cgroup_destroy"){+.+.}, at: [<000000008c61eb60>] set_work_data kernel/workqueue.c:619 [inline] #0: ((wq_completion)"cgroup_destroy"){+.+.}, at: [<000000008c61eb60>] set_work_pool_and_clear_pending kernel/workqueue.c:646 [inline] #0: ((wq_completion)"cgroup_destroy"){+.+.}, at: [<000000008c61eb60>] process_one_work+0xb12/0x1bb0 kernel/workqueue.c:2084 #1: ((work_completion)(&css->destroy_work)#3){+.+.}, at: [<00000000ac1be4ef>] process_one_work+0xb89/0x1bb0 kernel/workqueue.c:2088 #2: (cpu_hotplug_lock.rw_sem){++++}, at: [<00000000d11e042a>] get_online_cpus include/linux/cpu.h:124 [inline] #2: (cpu_hotplug_lock.rw_sem){++++}, at: [<00000000d11e042a>] memcg_destroy_kmem_caches+0xf/0x80 mm/slab_common.c:771 #3: (slab_mutex){+.+.}, at: [<000000006797b040>] memcg_destroy_kmem_caches+0x24/0x80 mm/slab_common.c:774 1 lock held by blkid/21599: #0: (&bdev->bd_mutex){+.+.}, at: [<00000000fb8cfa9d>] blkdev_put+0x2a/0x4f0 fs/block_dev.c:1808 1 lock held by syz-executor6/22580: #0: (&bdev->bd_mutex){+.+.}, at: [<00000000755eecc2>] iterate_bdevs+0xc8/0x260 fs/block_dev.c:2160 1 lock held by syz-executor6/22586: #0: (&bdev->bd_mutex){+.+.}, at: [<00000000755eecc2>] iterate_bdevs+0xc8/0x260 fs/block_dev.c:2160 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 801 Comm: khungtaskd Not tainted 4.16.0-rc6+ #366 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x194/0x24d lib/dump_stack.c:53 nmi_cpu_backtrace+0x1d2/0x210 lib/nmi_backtrace.c:103 nmi_trigger_cpumask_backtrace+0x123/0x180 lib/nmi_backtrace.c:62 arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38 trigger_all_cpu_backtrace include/linux/nmi.h:138 [inline] check_hung_task kernel/hung_task.c:132 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:190 [inline] watchdog+0x90c/0xd60 kernel/hung_task.c:249 kthread+0x33c/0x400 kernel/kthread.c:238 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:406 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 16320 Comm: kworker/1:11 Not tainted 4.16.0-rc6+ #366 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events rht_deferred_worker RIP: 0010:mark_lock+0x8/0x1430 kernel/locking/lockdep.c:3114 RSP: 0018:ffff8801bdd4f078 EFLAGS: 00000002 RAX: 0000000000000001 RBX: ffff8801acfbefe0 RCX: 0000000000000008 RDX: 0000000000000008 RSI: ffff8801acfbefe0 RDI: ffff8801acfbe740 RBP: ffff8801bdd4f080 R08: 1ffff10037ba9def R09: 0000000000000004 R10: 0000000000000000 R11: 0000000000000003 R12: 00000000000003a1 R13: ffff8801acfbf002 R14: 0000000000000001 R15: ffff8801acfbe740 FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffff600400 CR3: 0000000006e22004 CR4: 00000000001606e0 DR0: 0000000020000000 DR1: 0000000020000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: __lock_acquire+0x664/0x3e00 kernel/locking/lockdep.c:3392 lock_acquire+0x1d5/0x580 kernel/locking/lockdep.c:3920 process_one_work+0xbf9/0x1bb0 kernel/workqueue.c:2089 worker_thread+0x223/0x1990 kernel/workqueue.c:2247 kthread+0x33c/0x400 kernel/kthread.c:238 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:406 Code: 5f b4 52 00 e9 12 fe ff ff e8 55 b4 52 00 e9 4c ff ff ff e8 4b b4 52 00 e9 d3 fe ff ff 66 0f 1f 44 00 00 55 89 d1 48 89 e5 41 57 <41> 56 4c 8d 85 f8 fe ff ff 41 55 41 54 49 89 f4 48 be 00 00 00