[25820] 0 25820 11408 2089 65536 0 0 syz-executor1 Memory cgroup out of memory: Kill process 25820 (syz-executor1) score 2105000 or sacrifice child Killed process 25820 (syz-executor1) total-vm:45632kB, anon-rss:132kB, file-rss:8224kB, shmem-rss:0kB oom_reaper: reaped process 25820 (syz-executor1), now anon-rss:0kB, file-rss:0kB, shmem-rss:0kB INFO: task kworker/1:0:17 blocked for more than 120 seconds. Not tainted 4.16.0-rc7+ #367 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. kworker/1:0 D20112 17 2 0x80000000 Workqueue: events cgwb_release_workfn 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 bit_wait+0x18/0x90 kernel/sched/wait_bit.c:250 __wait_on_bit+0x88/0x130 kernel/sched/wait_bit.c:51 out_of_line_wait_on_bit+0x204/0x3a0 kernel/sched/wait_bit.c:64 wait_on_bit include/linux/wait_bit.h:84 [inline] wb_shutdown+0x335/0x430 mm/backing-dev.c:377 cgwb_release_workfn+0x8b/0x61d mm/backing-dev.c:520 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 Showing all locks held in the system: 2 locks held by kworker/1:0/17: #0: ((wq_completion)"events"){+.+.}, at: [<00000000c3fa7a23>] work_static include/linux/workqueue.h:198 [inline] #0: ((wq_completion)"events"){+.+.}, at: [<00000000c3fa7a23>] set_work_data kernel/workqueue.c:619 [inline] #0: ((wq_completion)"events"){+.+.}, at: [<00000000c3fa7a23>] set_work_pool_and_clear_pending kernel/workqueue.c:646 [inline] #0: ((wq_completion)"events"){+.+.}, at: [<00000000c3fa7a23>] process_one_work+0xb12/0x1bb0 kernel/workqueue.c:2084 #1: ((work_completion)(&wb->release_work)){+.+.}, at: [<00000000a8fcf19f>] process_one_work+0xb89/0x1bb0 kernel/workqueue.c:2088 2 locks held by khungtaskd/801: #0: (rcu_read_lock){....}, at: [<00000000a922705f>] check_hung_uninterruptible_tasks kernel/hung_task.c:175 [inline] #0: (rcu_read_lock){....}, at: [<00000000a922705f>] watchdog+0x1c5/0xd60 kernel/hung_task.c:249 #1: (tasklist_lock){.+.+}, at: [<00000000986e96b3>] debug_show_all_locks+0xd3/0x3d0 kernel/locking/lockdep.c:4470 3 locks held by kworker/0:3/1893: #0: ((wq_completion)"events"){+.+.}, at: [<00000000c3fa7a23>] work_static include/linux/workqueue.h:198 [inline] #0: ((wq_completion)"events"){+.+.}, at: [<00000000c3fa7a23>] set_work_data kernel/workqueue.c:619 [inline] #0: ((wq_completion)"events"){+.+.}, at: [<00000000c3fa7a23>] set_work_pool_and_clear_pending kernel/workqueue.c:646 [inline] #0: ((wq_completion)"events"){+.+.}, at: [<00000000c3fa7a23>] process_one_work+0xb12/0x1bb0 kernel/workqueue.c:2084 #1: (slab_caches_to_rcu_destroy_work){+.+.}, at: [<00000000a8fcf19f>] process_one_work+0xb89/0x1bb0 kernel/workqueue.c:2088 #2: (slab_mutex){+.+.}, at: [<00000000e3528f80>] slab_caches_to_rcu_destroy_workfn+0x25/0xc0 mm/slab_common.c:556 1 lock held by rsyslogd/4067: #0: (&f->f_pos_lock){+.+.}, at: [<000000007acc971f>] __fdget_pos+0x12b/0x190 fs/file.c:765 2 locks held by getty/4158: #0: (&tty->ldisc_sem){++++}, at: [<00000000d0ba872d>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000809d200b>] n_tty_read+0x2ef/0x1a40 drivers/tty/n_tty.c:2131 2 locks held by getty/4159: #0: (&tty->ldisc_sem){++++}, at: [<00000000d0ba872d>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000809d200b>] n_tty_read+0x2ef/0x1a40 drivers/tty/n_tty.c:2131 2 locks held by getty/4160: #0: (&tty->ldisc_sem){++++}, at: [<00000000d0ba872d>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000809d200b>] n_tty_read+0x2ef/0x1a40 drivers/tty/n_tty.c:2131 2 locks held by getty/4161: #0: (&tty->ldisc_sem){++++}, at: [<00000000d0ba872d>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000809d200b>] n_tty_read+0x2ef/0x1a40 drivers/tty/n_tty.c:2131 2 locks held by getty/4162: #0: (&tty->ldisc_sem){++++}, at: [<00000000d0ba872d>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000809d200b>] n_tty_read+0x2ef/0x1a40 drivers/tty/n_tty.c:2131 2 locks held by getty/4163: #0: (&tty->ldisc_sem){++++}, at: [<00000000d0ba872d>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000809d200b>] n_tty_read+0x2ef/0x1a40 drivers/tty/n_tty.c:2131 4 locks held by kworker/1:2/4869: #0: ((wq_completion)"memcg_kmem_cache"){+.+.}, at: [<00000000c3fa7a23>] work_static include/linux/workqueue.h:198 [inline] #0: ((wq_completion)"memcg_kmem_cache"){+.+.}, at: [<00000000c3fa7a23>] set_work_data kernel/workqueue.c:619 [inline] #0: ((wq_completion)"memcg_kmem_cache"){+.+.}, at: [<00000000c3fa7a23>] set_work_pool_and_clear_pending kernel/workqueue.c:646 [inline] #0: ((wq_completion)"memcg_kmem_cache"){+.+.}, at: [<00000000c3fa7a23>] process_one_work+0xb12/0x1bb0 kernel/workqueue.c:2084 #1: ((work_completion)(&cw->work)){+.+.}, at: [<00000000a8fcf19f>] process_one_work+0xb89/0x1bb0 kernel/workqueue.c:2088 #2: (cpu_hotplug_lock.rw_sem){++++}, at: [<0000000045e781c5>] get_online_cpus include/linux/cpu.h:124 [inline] #2: (cpu_hotplug_lock.rw_sem){++++}, at: [<0000000045e781c5>] memcg_create_kmem_cache+0x16/0x170 mm/slab_common.c:619 #3: (slab_mutex){+.+.}, at: [<0000000018b9c301>] memcg_create_kmem_cache+0x24/0x170 mm/slab_common.c:622 4 locks held by kworker/0:6/7912: #0: ((wq_completion)"cgroup_destroy"){+.+.}, at: [<00000000c3fa7a23>] work_static include/linux/workqueue.h:198 [inline] #0: ((wq_completion)"cgroup_destroy"){+.+.}, at: [<00000000c3fa7a23>] set_work_data kernel/workqueue.c:619 [inline] #0: ((wq_completion)"cgroup_destroy"){+.+.}, at: [<00000000c3fa7a23>] set_work_pool_and_clear_pending kernel/workqueue.c:646 [inline] #0: ((wq_completion)"cgroup_destroy"){+.+.}, at: [<00000000c3fa7a23>] process_one_work+0xb12/0x1bb0 kernel/workqueue.c:2084 #1: ((work_completion)(&css->destroy_work)#3){+.+.}, at: [<00000000a8fcf19f>] process_one_work+0xb89/0x1bb0 kernel/workqueue.c:2088 #2: (cpu_hotplug_lock.rw_sem){++++}, at: [<000000001405d0fd>] get_online_cpus include/linux/cpu.h:124 [inline] #2: (cpu_hotplug_lock.rw_sem){++++}, at: [<000000001405d0fd>] memcg_destroy_kmem_caches+0xf/0x80 mm/slab_common.c:771 #3: (slab_mutex){+.+.}, at: [<000000007f1d5898>] memcg_destroy_kmem_caches+0x24/0x80 mm/slab_common.c:774 2 locks held by getty/22269: #0: (&tty->ldisc_sem){++++}, at: [<00000000d0ba872d>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000809d200b>] n_tty_read+0x2ef/0x1a40 drivers/tty/n_tty.c:2131 3 locks held by syz-executor0/25844: #0: (&f->f_pos_lock){+.+.}, at: [<000000007acc971f>] __fdget_pos+0x12b/0x190 fs/file.c:765 #1: (sb_writers#10){.+.+}, at: [<000000004146322f>] file_start_write include/linux/fs.h:2709 [inline] #1: (sb_writers#10){.+.+}, at: [<000000004146322f>] vfs_write+0x407/0x510 fs/read_write.c:543 #2: (&of->mutex){+.+.}, at: [<00000000b8205951>] kernfs_fop_write+0x208/0x440 fs/kernfs/file.c:307 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 801 Comm: khungtaskd Not tainted 4.16.0-rc7+ #367 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: 11686 Comm: kworker/1:8 Not tainted 4.16.0-rc7+ #367 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:ffff8801b9eaf070 EFLAGS: 00000082 RAX: ffff880192ca2580 RBX: 000077ff80000000 RCX: ffff880192ca2580 RDX: ffff88018ef0c940 RSI: ffff8801b9eaf090 RDI: ffff8801db328f80 RBP: ffff8801b9eaf080 R08: ffff8801897c64c0 R09: 0000000080000000 R10: ffff880199529600 R11: ffffea0000000000 R12: ffffea00066c06df R13: ffff88018ef0c940 R14: ffffffff885ef2a0 R15: ffff88018ef0c940 FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000000079bc4e CR3: 0000000006e22004 CR4: 00000000001606e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: per_cpu_remove_cache+0x3f/0x60 mm/kasan/quarantine.c:294 on_each_cpu+0xca/0x1b0 kernel/smp.c:604 quarantine_remove_cache+0x55/0xf0 mm/kasan/quarantine.c:311 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