Buffer I/O error on dev loop7, logical block 29, async page read Buffer I/O error on dev loop7, logical block 30, async page read Buffer I/O error on dev loop7, logical block 31, async page read Buffer I/O error on dev loop7, logical block 16, lost async page write Buffer I/O error on dev loop7, logical block 24, lost async page write INFO: task syz-executor2:22297 blocked for more than 120 seconds. Not tainted 4.16.0-rc7+ #277 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor2 D22024 22297 22005 0x20020004 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 file_write_and_wait_range+0xd7/0x100 mm/filemap.c:756 blkdev_fsync+0x67/0xb0 fs/block_dev.c:623 vfs_fsync_range+0x110/0x260 fs/sync.c:196 generic_write_sync include/linux/fs.h:2680 [inline] blkdev_write_iter+0x2e6/0x3e0 fs/block_dev.c:1910 call_write_iter include/linux/fs.h:1782 [inline] do_iter_readv_writev+0x55c/0x830 fs/read_write.c:653 do_iter_write+0x154/0x540 fs/read_write.c:932 vfs_iter_write+0x77/0xb0 fs/read_write.c:945 iter_file_splice_write+0x7db/0xf30 fs/splice.c:749 do_splice_from fs/splice.c:851 [inline] direct_splice_actor+0x125/0x180 fs/splice.c:1018 splice_direct_to_actor+0x2c1/0x820 fs/splice.c:973 do_splice_direct+0x29b/0x3c0 fs/splice.c:1061 do_sendfile+0x5c9/0xe80 fs/read_write.c:1413 C_SYSC_sendfile fs/read_write.c:1489 [inline] compat_SyS_sendfile+0xea/0x1a0 fs/read_write.c:1478 do_syscall_32_irqs_on arch/x86/entry/common.c:330 [inline] do_fast_syscall_32+0x3ec/0xf9f arch/x86/entry/common.c:392 entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139 RIP: 0023:0xf7f51c99 RSP: 002b:00000000f774d09c EFLAGS: 00000286 ORIG_RAX: 00000000000000bb RAX: ffffffffffffffda RBX: 0000000000000013 RCX: 0000000000000014 RDX: 00000000200ddff8 RSI: 0000000002000001 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 Showing all locks held in the system: 3 locks held by kworker/u4:0/5: #0: ((wq_completion)"writeback"){+.+.}, at: [<00000000ca005e5d>] work_static include/linux/workqueue.h:198 [inline] #0: ((wq_completion)"writeback"){+.+.}, at: [<00000000ca005e5d>] set_work_data kernel/workqueue.c:619 [inline] #0: ((wq_completion)"writeback"){+.+.}, at: [<00000000ca005e5d>] set_work_pool_and_clear_pending kernel/workqueue.c:646 [inline] #0: ((wq_completion)"writeback"){+.+.}, at: [<00000000ca005e5d>] process_one_work+0xb12/0x1bb0 kernel/workqueue.c:2084 #1: ((work_completion)(&(&wb->dwork)->work)){+.+.}, at: [<0000000033d25dbe>] process_one_work+0xb89/0x1bb0 kernel/workqueue.c:2088 #2: (&type->s_umount_key#33){.+.+}, at: [<0000000075061542>] trylock_super+0x20/0x100 fs/super.c:395 2 locks held by khungtaskd/800: #0: (rcu_read_lock){....}, at: [<000000004cbd06bf>] check_hung_uninterruptible_tasks kernel/hung_task.c:175 [inline] #0: (rcu_read_lock){....}, at: [<000000004cbd06bf>] watchdog+0x1c5/0xd60 kernel/hung_task.c:249 #1: (tasklist_lock){.+.+}, at: [<00000000a00764de>] debug_show_all_locks+0xd3/0x3d0 kernel/locking/lockdep.c:4470 2 locks held by getty/4170: #0: (&tty->ldisc_sem){++++}, at: [<00000000cda04cc3>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000c9c9b6bf>] n_tty_read+0x2ef/0x1a40 drivers/tty/n_tty.c:2131 2 locks held by getty/4171: #0: (&tty->ldisc_sem){++++}, at: [<00000000cda04cc3>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000c9c9b6bf>] n_tty_read+0x2ef/0x1a40 drivers/tty/n_tty.c:2131 2 locks held by getty/4172: #0: (&tty->ldisc_sem){++++}, at: [<00000000cda04cc3>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000c9c9b6bf>] n_tty_read+0x2ef/0x1a40 drivers/tty/n_tty.c:2131 2 locks held by getty/4173: #0: (&tty->ldisc_sem){++++}, at: [<00000000cda04cc3>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000c9c9b6bf>] n_tty_read+0x2ef/0x1a40 drivers/tty/n_tty.c:2131 2 locks held by getty/4174: #0: (&tty->ldisc_sem){++++}, at: [<00000000cda04cc3>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000c9c9b6bf>] n_tty_read+0x2ef/0x1a40 drivers/tty/n_tty.c:2131 2 locks held by getty/4175: #0: (&tty->ldisc_sem){++++}, at: [<00000000cda04cc3>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000c9c9b6bf>] n_tty_read+0x2ef/0x1a40 drivers/tty/n_tty.c:2131 2 locks held by getty/4176: #0: (&tty->ldisc_sem){++++}, at: [<00000000cda04cc3>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000c9c9b6bf>] n_tty_read+0x2ef/0x1a40 drivers/tty/n_tty.c:2131 4 locks held by kworker/0:9/16215: #0: ((wq_completion)"cgroup_destroy"){+.+.}, at: [<00000000ca005e5d>] work_static include/linux/workqueue.h:198 [inline] #0: ((wq_completion)"cgroup_destroy"){+.+.}, at: [<00000000ca005e5d>] set_work_data kernel/workqueue.c:619 [inline] #0: ((wq_completion)"cgroup_destroy"){+.+.}, at: [<00000000ca005e5d>] set_work_pool_and_clear_pending kernel/workqueue.c:646 [inline] #0: ((wq_completion)"cgroup_destroy"){+.+.}, at: [<00000000ca005e5d>] process_one_work+0xb12/0x1bb0 kernel/workqueue.c:2084 #1: ((work_completion)(&css->destroy_work)#3){+.+.}, at: [<0000000033d25dbe>] process_one_work+0xb89/0x1bb0 kernel/workqueue.c:2088 #2: (cpu_hotplug_lock.rw_sem){++++}, at: [<000000007899f940>] get_online_cpus include/linux/cpu.h:124 [inline] #2: (cpu_hotplug_lock.rw_sem){++++}, at: [<000000007899f940>] memcg_destroy_kmem_caches+0xf/0x80 mm/slab_common.c:771 #3: (slab_mutex){+.+.}, at: [<0000000011ee6a19>] memcg_destroy_kmem_caches+0x24/0x80 mm/slab_common.c:774 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 800 Comm: khungtaskd Not tainted 4.16.0-rc7+ #277 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: 5648 Comm: kworker/1:5 Not tainted 4.16.0-rc7+ #277 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: cgroup_destroy css_free_work_fn RIP: 0010:qlist_move_cache+0x73/0xf0 mm/kasan/quarantine.c:275 RSP: 0018:ffff8801b6cd70c8 EFLAGS: 00000086 RAX: ffff8801b9ccda00 RBX: 000077ff80000000 RCX: ffff8801b9ccda00 RDX: ffff8801a23c6000 RSI: ffff8801b6cd70e8 RDI: ffffffff885eb118 RBP: ffff8801b6cd70d8 R08: ffff8801b4a54280 R09: 0000000080000000 R10: ffff8801c4574b80 R11: ffffea0000000000 R12: ffffea00073b155f R13: ffffffff86fd55a0 R14: ffffffff885ef2a0 R15: ffff8801a23c6000 FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f2d28dfea8c CR3: 0000000006e22001 CR4: 00000000001606e0 DR0: 0000000020000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: quarantine_remove_cache+0x79/0xf0 mm/kasan/quarantine.c:317 kasan_cache_shutdown+0x9/0x10 mm/kasan/kasan.c:381 shutdown_cache+0x15/0x1b0 mm/slab_common.c:577 memcg_destroy_kmem_caches+0x62/0x80 mm/slab_common.c:781 memcg_free_kmem mm/memcontrol.c:2856 [inline] mem_cgroup_css_free+0x2a4/0x3f0 mm/memcontrol.c:4298 css_free_work_fn+0x1c8/0x1420 kernel/cgroup/cgroup.c:4541 process_one_work+0xc47/0x1bb0 kernel/workqueue.c:2113 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: 3f 00 8b 40 14 74 7f 4c 8b 47 08 49 89 08 48 89 4f 08 48 c7 01 00 00 00 00 4c 89 d1 48 01 47 10 4d 85 d2 74 5c 48 89 c8 4c 8b 11 <4c> 01 c8 72 62 49 89 d8 4c 01 c0 48 c1 e8 0c 48 c1 e0 06 4c 01