Can not set IPV6_FL_F_REFLECT if flowlabel_consistency sysctl is enable sctp: [Deprecated]: syz-executor6 (pid 14881) Use of int in max_burst socket option deprecated. Use struct sctp_assoc_value instead Can not set IPV6_FL_F_REFLECT if flowlabel_consistency sysctl is enable kworker/dying (762) used greatest stack depth: 10072 bytes left INFO: task kworker/0:0:3 blocked for more than 120 seconds. Not tainted 4.16.0-rc6+ #282 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. kworker/0:0 D20928 3 2 0x80000000 Workqueue: cgroup_destroy css_killed_work_fn 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 schedule_preempt_disabled+0x10/0x20 kernel/sched/core.c:3557 __mutex_lock_common kernel/locking/mutex.c:833 [inline] __mutex_lock+0xaad/0x1a80 kernel/locking/mutex.c:893 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:908 memcg_deactivate_kmem_caches+0x2f/0xf0 mm/slab_common.c:750 memcg_offline_kmem.part.56+0x58/0x340 mm/memcontrol.c:2817 memcg_offline_kmem mm/memcontrol.c:4276 [inline] mem_cgroup_css_offline+0x343/0x510 mm/memcontrol.c:4272 offline_css kernel/cgroup/cgroup.c:4702 [inline] css_killed_work_fn+0x121/0x5c0 kernel/cgroup/cgroup.c:4970 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: 5 locks held by kworker/0:0/3: #0: ((wq_completion)"cgroup_destroy"){+.+.}, at: [<00000000b262bf7c>] work_static include/linux/workqueue.h:198 [inline] #0: ((wq_completion)"cgroup_destroy"){+.+.}, at: [<00000000b262bf7c>] set_work_data kernel/workqueue.c:619 [inline] #0: ((wq_completion)"cgroup_destroy"){+.+.}, at: [<00000000b262bf7c>] set_work_pool_and_clear_pending kernel/workqueue.c:646 [inline] #0: ((wq_completion)"cgroup_destroy"){+.+.}, at: [<00000000b262bf7c>] process_one_work+0xb12/0x1bb0 kernel/workqueue.c:2084 #1: ((work_completion)(&css->destroy_work)){+.+.}, at: [<00000000a86eadf6>] process_one_work+0xb89/0x1bb0 kernel/workqueue.c:2088 #2: (cgroup_mutex){+.+.}, at: [<000000007ff09313>] css_killed_work_fn+0x93/0x5c0 kernel/cgroup/cgroup.c:4967 #3: (cpu_hotplug_lock.rw_sem){++++}, at: [<000000009600f32b>] get_online_cpus include/linux/cpu.h:124 [inline] #3: (cpu_hotplug_lock.rw_sem){++++}, at: [<000000009600f32b>] memcg_deactivate_kmem_caches+0x21/0xf0 mm/slab_common.c:747 #4: (slab_mutex){+.+.}, at: [<000000009d057d7c>] memcg_deactivate_kmem_caches+0x2f/0xf0 mm/slab_common.c:750 2 locks held by khungtaskd/801: #0: (rcu_read_lock){....}, at: [<00000000f4ea5923>] check_hung_uninterruptible_tasks kernel/hung_task.c:175 [inline] #0: (rcu_read_lock){....}, at: [<00000000f4ea5923>] watchdog+0x1c5/0xd60 kernel/hung_task.c:249 #1: (tasklist_lock){.+.+}, at: [<0000000074cfa5b1>] debug_show_all_locks+0xd3/0x3d0 kernel/locking/lockdep.c:4470 4 locks held by kworker/0:2/1784: #0: ((wq_completion)"memcg_kmem_cache"){+.+.}, at: [<00000000b262bf7c>] work_static include/linux/workqueue.h:198 [inline] #0: ((wq_completion)"memcg_kmem_cache"){+.+.}, at: [<00000000b262bf7c>] set_work_data kernel/workqueue.c:619 [inline] #0: ((wq_completion)"memcg_kmem_cache"){+.+.}, at: [<00000000b262bf7c>] set_work_pool_and_clear_pending kernel/workqueue.c:646 [inline] #0: ((wq_completion)"memcg_kmem_cache"){+.+.}, at: [<00000000b262bf7c>] process_one_work+0xb12/0x1bb0 kernel/workqueue.c:2084 #1: ((work_completion)(&cw->work)){+.+.}, at: [<00000000a86eadf6>] process_one_work+0xb89/0x1bb0 kernel/workqueue.c:2088 #2: (cpu_hotplug_lock.rw_sem){++++}, at: [<00000000f5fb22bc>] get_online_cpus include/linux/cpu.h:124 [inline] #2: (cpu_hotplug_lock.rw_sem){++++}, at: [<00000000f5fb22bc>] memcg_create_kmem_cache+0x16/0x170 mm/slab_common.c:619 #3: (slab_mutex){+.+.}, at: [<00000000f25c5ffc>] memcg_create_kmem_cache+0x24/0x170 mm/slab_common.c:622 2 locks held by getty/4176: #0: (&tty->ldisc_sem){++++}, at: [<000000001c079c8e>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000b6be7937>] n_tty_read+0x2ef/0x1a40 drivers/tty/n_tty.c:2131 2 locks held by getty/4177: #0: (&tty->ldisc_sem){++++}, at: [<000000001c079c8e>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000b6be7937>] n_tty_read+0x2ef/0x1a40 drivers/tty/n_tty.c:2131 2 locks held by getty/4178: #0: (&tty->ldisc_sem){++++}, at: [<000000001c079c8e>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000b6be7937>] n_tty_read+0x2ef/0x1a40 drivers/tty/n_tty.c:2131 2 locks held by getty/4179: #0: (&tty->ldisc_sem){++++}, at: [<000000001c079c8e>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000b6be7937>] n_tty_read+0x2ef/0x1a40 drivers/tty/n_tty.c:2131 2 locks held by getty/4180: #0: (&tty->ldisc_sem){++++}, at: [<000000001c079c8e>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000b6be7937>] n_tty_read+0x2ef/0x1a40 drivers/tty/n_tty.c:2131 2 locks held by getty/4181: #0: (&tty->ldisc_sem){++++}, at: [<000000001c079c8e>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000b6be7937>] n_tty_read+0x2ef/0x1a40 drivers/tty/n_tty.c:2131 2 locks held by getty/4182: #0: (&tty->ldisc_sem){++++}, at: [<000000001c079c8e>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000b6be7937>] n_tty_read+0x2ef/0x1a40 drivers/tty/n_tty.c:2131 1 lock held by syz-fuzzer/4197: #0: (&mm->mmap_sem){++++}, at: [<0000000050656b32>] SYSC_madvise mm/madvise.c:827 [inline] #0: (&mm->mmap_sem){++++}, at: [<0000000050656b32>] SyS_madvise+0x18f/0x13d0 mm/madvise.c:791 1 lock held by syz-fuzzer/4201: #0: (&mm->mmap_sem){++++}, at: [<0000000025483daa>] __do_page_fault+0x84b/0xc90 arch/x86/mm/fault.c:1358 3 locks held by syz-fuzzer/24365: #0: (&mm->mmap_sem){++++}, at: [<000000007a45267c>] __do_page_fault+0x32d/0xc90 arch/x86/mm/fault.c:1351 #1: (&ei->i_mmap_sem){++++}, at: [<000000004611eeda>] ext4_filemap_fault+0x7a/0xad fs/ext4/inode.c:6176 #2: (pcpu_drain_mutex){+.+.}, at: [<00000000136c9dc9>] drain_all_pages+0x94/0x620 mm/page_alloc.c:2528 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 801 Comm: khungtaskd Not tainted 4.16.0-rc6+ #282 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 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 1436 Comm: kswapd0 Not tainted 4.16.0-rc6+ #282 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__read_once_size include/linux/compiler.h:188 [inline] RIP: 0010:lookup_chain_cache kernel/locking/lockdep.c:2314 [inline] RIP: 0010:lookup_chain_cache_add kernel/locking/lockdep.c:2334 [inline] RIP: 0010:validate_chain kernel/locking/lockdep.c:2388 [inline] RIP: 0010:__lock_acquire+0x1322/0x3e00 kernel/locking/lockdep.c:3431 RSP: 0000:ffff8801d4e3f060 EFLAGS: 00000046 RAX: ffff8801d4e3f1a0 RBX: ffff8801d4e2cf60 RCX: 1ffff1003a9c7e34 RDX: dffffc0000000000 RSI: 00000000912bdaac RDI: 0000000000000000 RBP: ffff8801d4e3f3f0 R08: 1ffff1003a9c7de9 R09: 0000000000000004 R10: 0000000000000000 R11: 0000000000000003 R12: 00000000000044c0 R13: 9806f7cfc95a4dd1 R14: ffffffff87b2f968 R15: ffff8801d4e2c6c0 FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000001768060 CR3: 0000000006e22006 CR4: 00000000001606f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: lock_acquire+0x1d5/0x580 kernel/locking/lockdep.c:3920 __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline] _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:144 spin_lock include/linux/spinlock.h:310 [inline] __list_lru_count_one mm/list_lru.c:171 [inline] list_lru_count_one+0x91/0x1f0 mm/list_lru.c:182 list_lru_shrink_count include/linux/list_lru.h:117 [inline] super_cache_count+0x10d/0x280 fs/super.c:133 do_shrink_slab mm/vmscan.c:310 [inline] shrink_slab.part.46+0x30c/0xe80 mm/vmscan.c:475 shrink_slab+0x9d/0xb0 mm/vmscan.c:442 shrink_node+0x51e/0xf70 mm/vmscan.c:2556 kswapd_shrink_node mm/vmscan.c:3212 [inline] balance_pgdat mm/vmscan.c:3318 [inline] kswapd+0xc27/0x1e40 mm/vmscan.c:3537 kthread+0x33c/0x400 kernel/kthread.c:238 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:406 Code: 00 0f 85 d7 25 00 00 48 8d 85 b0 fd ff ff 48 ba 00 00 00 00 00 fc ff df 4e 8b 34 e5 00 a1 0a 88 48 89 c1 48 c1 e9 03 80 3c 11 00 <0f> 85 84 25 00 00 48 c1 e8 03 48 ba 00 00 00 00 00 fc ff df 4d