INFO: task syz-executor.5:21391 blocked for more than 143 seconds. Not tainted 5.12.0-rc6-next-20210409-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.5 state:D stack:26336 pid:21391 ppid: 8605 flags:0x00004006 Call Trace: context_switch kernel/sched/core.c:4329 [inline] __schedule+0x917/0x2170 kernel/sched/core.c:5079 schedule+0xcf/0x270 kernel/sched/core.c:5158 rwsem_down_write_slowpath+0x7dc/0x1200 kernel/locking/rwsem.c:1106 __down_write_common kernel/locking/rwsem.c:1261 [inline] __down_write_common kernel/locking/rwsem.c:1258 [inline] __down_write kernel/locking/rwsem.c:1270 [inline] down_write+0x137/0x150 kernel/locking/rwsem.c:1407 unregister_netdevice_notifier+0x1e/0x170 net/core/dev.c:1949 raw_release+0x58/0x8a0 net/can/raw.c:354 __sock_release+0xcd/0x280 net/socket.c:599 sock_close+0x18/0x20 net/socket.c:1258 __fput+0x288/0x920 fs/file_table.c:280 task_work_run+0xdd/0x1a0 kernel/task_work.c:164 exit_task_work include/linux/task_work.h:32 [inline] do_exit+0xbfc/0x2a70 kernel/exit.c:825 do_group_exit+0x125/0x310 kernel/exit.c:922 get_signal+0x47f/0x2150 kernel/signal.c:2779 arch_do_signal_or_restart+0x2a8/0x1eb0 arch/x86/kernel/signal.c:789 handle_signal_work kernel/entry/common.c:147 [inline] exit_to_user_mode_loop kernel/entry/common.c:171 [inline] exit_to_user_mode_prepare+0x148/0x250 kernel/entry/common.c:208 __syscall_exit_to_user_mode_work kernel/entry/common.c:290 [inline] syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:301 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x466459 RSP: 002b:00007facf268b188 EFLAGS: 00000246 ORIG_RAX: 0000000000000038 RAX: fffffffffffffffc RBX: 000000000056bf60 RCX: 0000000000466459 RDX: 9999999999999999 RSI: 0000000000000000 RDI: 00000000e1004d7c RBP: 00000000004bf9fb R08: ffffffffffffffff R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf60 R13: 00007ffe6928224f R14: 00007facf268b300 R15: 0000000000022000 Showing all locks held in the system: 4 locks held by kworker/u4:3/210: #0: ffff88814018b138 ((wq_completion)netns){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: ffff88814018b138 ((wq_completion)netns){+.+.}-{0:0}, at: atomic64_set include/asm-generic/atomic-instrumented.h:856 [inline] #0: ffff88814018b138 ((wq_completion)netns){+.+.}-{0:0}, at: atomic_long_set include/asm-generic/atomic-long.h:41 [inline] #0: ffff88814018b138 ((wq_completion)netns){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:616 [inline] #0: ffff88814018b138 ((wq_completion)netns){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:643 [inline] #0: ffff88814018b138 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work+0x871/0x1600 kernel/workqueue.c:2246 #1: ffffc90000fefda8 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work+0x8a5/0x1600 kernel/workqueue.c:2250 #2: ffffffff8d67de10 (pernet_ops_rwsem){++++}-{3:3}, at: cleanup_net+0x9b/0xb10 net/core/net_namespace.c:557 #3: ffffffff8bf7e370 (rcu_state.barrier_mutex){+.+.}-{3:3}, at: rcu_barrier+0x44/0x430 kernel/rcu/tree.c:3996 1 lock held by khungtaskd/1644: #0: ffffffff8bf752a0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6333 1 lock held by in:imklog/8140: #0: ffff8880141fe0f0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:990 2 locks held by syz-executor.5/21391: #0: ffff888057e88750 (&sb->s_type->i_mutex_key#13){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:773 [inline] #0: ffff888057e88750 (&sb->s_type->i_mutex_key#13){+.+.}-{3:3}, at: __sock_release+0x86/0x280 net/socket.c:598 #1: ffffffff8d67de10 (pernet_ops_rwsem){++++}-{3:3}, at: unregister_netdevice_notifier+0x1e/0x170 net/core/dev.c:1949 1 lock held by syz-executor.2/21866: #0: ffffffff8d67de10 (pernet_ops_rwsem){++++}-{3:3}, at: copy_net_ns+0x2f5/0x760 net/core/net_namespace.c:470 1 lock held by syz-executor.0/21867: #0: ffffffff8d67de10 (pernet_ops_rwsem){++++}-{3:3}, at: copy_net_ns+0x2f5/0x760 net/core/net_namespace.c:470 1 lock held by syz-executor.5/21871: #0: ffffffff8d67de10 (pernet_ops_rwsem){++++}-{3:3}, at: copy_net_ns+0x2f5/0x760 net/core/net_namespace.c:470 1 lock held by syz-executor.3/21872: #0: ffffffff8d67de10 (pernet_ops_rwsem){++++}-{3:3}, at: copy_net_ns+0x2f5/0x760 net/core/net_namespace.c:470 1 lock held by syz-executor.1/21873: #0: ffffffff8d67de10 (pernet_ops_rwsem){++++}-{3:3}, at: copy_net_ns+0x2f5/0x760 net/core/net_namespace.c:470 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1644 Comm: khungtaskd Not tainted 5.12.0-rc6-next-20210409-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:79 [inline] dump_stack+0x141/0x1d7 lib/dump_stack.c:120 nmi_cpu_backtrace.cold+0x44/0xd7 lib/nmi_backtrace.c:105 nmi_trigger_cpumask_backtrace+0x1b3/0x230 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:253 [inline] watchdog+0xd3b/0xf50 kernel/hung_task.c:338 kthread+0x3b1/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 9758 Comm: kworker/0:8 Not tainted 5.12.0-rc6-next-20210409-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events toggle_allocation_gate RIP: 0010:rcu_lockdep_current_cpu_online kernel/rcu/tree.c:1197 [inline] RIP: 0010:rcu_lockdep_current_cpu_online+0xcb/0x150 kernel/rcu/tree.c:1186 Code: 03 80 3c 02 00 75 7b 48 8d 7d 70 48 8b 5b 20 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 75 66 48 8b 45 70 <48> 85 c3 74 11 b8 01 00 00 00 65 ff 0d b4 b4 a1 7e 74 2a 5b 5d c3 RSP: 0018:ffffc9001620f9a8 EFLAGS: 00000046 RAX: 0000000000000003 RBX: 0000000000000001 RCX: ffffffff81338674 RDX: 1ffffffff17efbd6 RSI: 0000000000000003 RDI: ffffffff8bf7deb0 RBP: ffffffff8bf7de40 R08: 0000000000000000 R09: ffffffff8dc7d34f R10: fffffbfff1b8fa69 R11: 000000000000003f R12: 0000000000000001 R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000020 FS: 0000000000000000(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f0a5ffb3000 CR3: 000000000bc8e000 CR4: 00000000001506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: rcu_read_lock_held_common kernel/rcu/update.c:112 [inline] rcu_read_lock_held_common kernel/rcu/update.c:102 [inline] rcu_read_lock_sched_held+0x25/0x70 kernel/rcu/update.c:123 trace_tlb_flush include/trace/events/tlb.h:38 [inline] trace_tlb_flush+0x129/0x1c0 include/trace/events/tlb.h:38 switch_mm_irqs_off+0x4a7/0x9b0 arch/x86/mm/tlb.c:564 unuse_temporary_mm arch/x86/kernel/alternative.c:722 [inline] __text_poke+0x541/0x8c0 arch/x86/kernel/alternative.c:818 text_poke_bp_batch+0x3d7/0x560 arch/x86/kernel/alternative.c:1137 text_poke_flush arch/x86/kernel/alternative.c:1227 [inline] text_poke_flush arch/x86/kernel/alternative.c:1224 [inline] text_poke_finish+0x16/0x30 arch/x86/kernel/alternative.c:1234 arch_jump_label_transform_apply+0x13/0x20 arch/x86/kernel/jump_label.c:122 jump_label_update+0x1da/0x400 kernel/jump_label.c:825 static_key_disable_cpuslocked+0x152/0x1b0 kernel/jump_label.c:207 static_key_disable+0x16/0x20 kernel/jump_label.c:215 toggle_allocation_gate mm/kfence/core.c:627 [inline] toggle_allocation_gate+0x23a/0x2e0 mm/kfence/core.c:602 process_one_work+0x98d/0x1600 kernel/workqueue.c:2275 worker_thread+0x64c/0x1120 kernel/workqueue.c:2421 kthread+0x3b1/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294