INFO: task syz-executor.5:2198 blocked for more than 143 seconds. Not tainted 5.6.0-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.5 D26184 2198 5274 0x00004004 Call Trace: schedule+0xd0/0x2a0 kernel/sched/core.c:4168 rwsem_down_write_slowpath+0x706/0xf90 kernel/locking/rwsem.c:1235 __down_write kernel/locking/rwsem.c:1389 [inline] down_write+0x137/0x150 kernel/locking/rwsem.c:1532 unregister_netdevice_notifier+0x1e/0x170 net/core/dev.c:1776 raw_release+0x53/0x730 net/can/raw.c:354 __sock_release+0x1d3/0x280 net/socket.c:605 sock_release net/socket.c:625 [inline] __sys_socketpair+0x4e4/0x560 net/socket.c:1603 __do_sys_socketpair net/socket.c:1637 [inline] __se_sys_socketpair net/socket.c:1634 [inline] __x64_sys_socketpair+0x93/0xf0 net/socket.c:1634 do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xb3 RIP: 0033:0x45c879 Code: Bad RIP value. RSP: 002b:00007f53685b4c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000035 RAX: ffffffffffffffda RBX: 00007f53685b56d4 RCX: 000000000045c879 RDX: 0000000000000001 RSI: 0000000000000003 RDI: 000000000000001d RBP: 000000000076bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000020000080 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000b9e R14: 00000000004cdd00 R15: 000000000076bf0c INFO: task syz-executor.5:2225 blocked for more than 143 seconds. Not tainted 5.6.0-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.5 D28928 2225 5274 0x00000004 Call Trace: schedule+0xd0/0x2a0 kernel/sched/core.c:4168 rwsem_down_write_slowpath+0x706/0xf90 kernel/locking/rwsem.c:1235 __down_write kernel/locking/rwsem.c:1389 [inline] down_write+0x137/0x150 kernel/locking/rwsem.c:1532 register_netdevice_notifier+0x1e/0x270 net/core/dev.c:1729 raw_init+0x296/0x340 net/can/raw.c:339 can_create+0x27c/0x500 net/can/af_can.c:168 __sock_create+0x3cb/0x730 net/socket.c:1433 sock_create net/socket.c:1484 [inline] __sys_socketpair+0x1be/0x560 net/socket.c:1584 __do_sys_socketpair net/socket.c:1637 [inline] __se_sys_socketpair net/socket.c:1634 [inline] __x64_sys_socketpair+0x93/0xf0 net/socket.c:1634 do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xb3 RIP: 0033:0x45c879 Code: Bad RIP value. RSP: 002b:00007f5368530c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000035 RAX: ffffffffffffffda RBX: 00007f53685316d4 RCX: 000000000045c879 RDX: 0000000000000001 RSI: 0000000000000003 RDI: 000000000000001d RBP: 000000000076c180 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000020000080 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000b9e R14: 00000000004cdd00 R15: 000000000076c18c INFO: task syz-executor.4:2201 blocked for more than 143 seconds. Not tainted 5.6.0-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.4 D29320 2201 24637 0x00004004 Call Trace: schedule+0xd0/0x2a0 kernel/sched/core.c:4168 rwsem_down_write_slowpath+0x706/0xf90 kernel/locking/rwsem.c:1235 __down_write kernel/locking/rwsem.c:1389 [inline] down_write+0x137/0x150 kernel/locking/rwsem.c:1532 register_netdevice_notifier+0x1e/0x270 net/core/dev.c:1729 raw_init+0x296/0x340 net/can/raw.c:339 can_create+0x27c/0x500 net/can/af_can.c:168 __sock_create+0x3cb/0x730 net/socket.c:1433 sock_create net/socket.c:1484 [inline] __sys_socketpair+0x242/0x560 net/socket.c:1588 __do_sys_socketpair net/socket.c:1637 [inline] __se_sys_socketpair net/socket.c:1634 [inline] __x64_sys_socketpair+0x93/0xf0 net/socket.c:1634 do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xb3 RIP: 0033:0x45c879 Code: ff 80 7c 24 18 00 74 cf 48 8b 44 24 38 48 8b 48 60 48 85 c9 74 1a 8b 54 24 24 85 d2 74 12 8b 5c 24 68 0f b7 0c 59 81 e1 ff 7f <00> 00 39 d1 75 30 48 8b 4c 24 28 48 8b 54 24 40 48 8b 4c ca 08 48 RSP: 002b:00007f5537b72c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000035 RAX: ffffffffffffffda RBX: 00007f5537b736d4 RCX: 000000000045c879 RDX: 0000000000000001 RSI: 0000000000000003 RDI: 000000000000001d RBP: 000000000076bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000020000080 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000b9e R14: 00000000004cdd00 R15: 000000000076bf0c INFO: task syz-executor.4:2227 blocked for more than 144 seconds. Not tainted 5.6.0-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.4 D29608 2227 24637 0x00000004 Call Trace: schedule+0xd0/0x2a0 kernel/sched/core.c:4168 rwsem_down_write_slowpath+0x706/0xf90 kernel/locking/rwsem.c:1235 __down_write kernel/locking/rwsem.c:1389 [inline] down_write+0x137/0x150 kernel/locking/rwsem.c:1532 register_netdevice_notifier+0x1e/0x270 net/core/dev.c:1729 raw_init+0x296/0x340 net/can/raw.c:339 can_create+0x27c/0x500 net/can/af_can.c:168 __sock_create+0x3cb/0x730 net/socket.c:1433 sock_create net/socket.c:1484 [inline] __sys_socketpair+0x1be/0x560 net/socket.c:1584 __do_sys_socketpair net/socket.c:1637 [inline] __se_sys_socketpair net/socket.c:1634 [inline] __x64_sys_socketpair+0x93/0xf0 net/socket.c:1634 do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xb3 RIP: 0033:0x45c879 Code: ff 80 7c 24 18 00 74 cf 48 8b 44 24 38 48 8b 48 60 48 85 c9 74 1a 8b 54 24 24 85 d2 74 12 8b 5c 24 68 0f b7 0c 59 81 e1 ff 7f <00> 00 39 d1 75 30 48 8b 4c 24 28 48 8b 54 24 40 48 8b 4c ca 08 48 RSP: 002b:00007f5537b30c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000035 RAX: ffffffffffffffda RBX: 00007f5537b316d4 RCX: 000000000045c879 RDX: 0000000000000001 RSI: 0000000000000003 RDI: 000000000000001d RBP: 000000000076c040 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000020000080 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000b9e R14: 00000000004cdd00 R15: 000000000076c04c Showing all locks held in the system: 4 locks held by kworker/u4:1/21: #0: ffff88821b042138 ((wq_completion)netns){+.+.}-{0:0}, at: __write_once_size include/linux/compiler.h:226 [inline] #0: ffff88821b042138 ((wq_completion)netns){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: ffff88821b042138 ((wq_completion)netns){+.+.}-{0:0}, at: atomic64_set include/asm-generic/atomic-instrumented.h:855 [inline] #0: ffff88821b042138 ((wq_completion)netns){+.+.}-{0:0}, at: atomic_long_set include/asm-generic/atomic-long.h:40 [inline] #0: ffff88821b042138 ((wq_completion)netns){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:615 [inline] #0: ffff88821b042138 ((wq_completion)netns){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:642 [inline] #0: ffff88821b042138 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work+0x844/0x16a0 kernel/workqueue.c:2237 #1: ffffc90000dd7dc0 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work+0x878/0x16a0 kernel/workqueue.c:2241 #2: ffffffff8a55a9b0 (pernet_ops_rwsem){++++}-{3:3}, at: cleanup_net+0x9b/0xa50 net/core/net_namespace.c:565 #3: ffffffff8a5668a8 (rtnl_mutex){+.+.}-{3:3}, at: ieee80211_unregister_hw+0x3f/0x220 net/mac80211/main.c:1347 1 lock held by khungtaskd/1058: #0: ffffffff899bab40 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:5743 1 lock held by in:imklog/6732: #0: ffff8880a81021b0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:826 1 lock held by syz-executor.5/2198: #0: ffffffff8a55a9b0 (pernet_ops_rwsem){++++}-{3:3}, at: unregister_netdevice_notifier+0x1e/0x170 net/core/dev.c:1776 1 lock held by syz-executor.5/2225: #0: ffffffff8a55a9b0 (pernet_ops_rwsem){++++}-{3:3}, at: register_netdevice_notifier+0x1e/0x270 net/core/dev.c:1729 1 lock held by syz-executor.4/2201: #0: ffffffff8a55a9b0 (pernet_ops_rwsem){++++}-{3:3}, at: register_netdevice_notifier+0x1e/0x270 net/core/dev.c:1729 1 lock held by syz-executor.4/2227: #0: ffffffff8a55a9b0 (pernet_ops_rwsem){++++}-{3:3}, at: register_netdevice_notifier+0x1e/0x270 net/core/dev.c:1729 1 lock held by syz-executor.3/4092: #0: ffffffff8a55a9b0 (pernet_ops_rwsem){++++}-{3:3}, at: copy_net_ns+0x270/0x590 net/core/net_namespace.c:478 1 lock held by syz-executor.0/4104: #0: ffffffff8a55a9b0 (pernet_ops_rwsem){++++}-{3:3}, at: copy_net_ns+0x270/0x590 net/core/net_namespace.c:478 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1058 Comm: khungtaskd Not tainted 5.6.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x188/0x20d lib/dump_stack.c:118 nmi_cpu_backtrace.cold+0x70/0xb1 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x231/0x27e lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:205 [inline] watchdog+0xa8c/0x1010 kernel/hung_task.c:289 kthread+0x388/0x470 kernel/kthread.c:268 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 4105 Comm: systemd-journal Not tainted 5.6.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__read_once_size include/linux/compiler.h:199 [inline] RIP: 0010:lookup_chain_cache kernel/locking/lockdep.c:3127 [inline] RIP: 0010:lookup_chain_cache_add kernel/locking/lockdep.c:3147 [inline] RIP: 0010:validate_chain kernel/locking/lockdep.c:3202 [inline] RIP: 0010:__lock_acquire+0x21b3/0x4e00 kernel/locking/lockdep.c:4344 Code: dd 80 4b 26 8c 48 89 4c 24 18 0f 84 78 05 00 00 48 8d 14 dd 80 4b 26 8c 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 80 3c 02 00 <0f> 85 09 27 00 00 48 8b 04 dd 80 4b 26 8c 48 85 c0 74 62 48 83 e8 RSP: 0018:ffffc90001627a48 EFLAGS: 00000046 RAX: dffffc0000000000 RBX: 0000000000000571 RCX: ffffffff8c267708 RDX: 1ffffffff184cee1 RSI: 0000000000000008 RDI: ffffffff8c2b0c20 RBP: ffff888093dd8a00 R08: 0000000000000001 R09: fffffbfff1856185 R10: fffffbfff1856184 R11: ffffffff8c2b0c27 R12: ffff888093dd8140 R13: 0000000000000000 R14: 0000000000000001 R15: ffffffff8a880190 FS: 00007f53635068c0(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f53603b7018 CR3: 0000000093d9c000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: lock_acquire+0x1f2/0x8f0 kernel/locking/lockdep.c:4923 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x8c/0xbf kernel/locking/spinlock.c:159 __debug_check_no_obj_freed lib/debugobjects.c:955 [inline] debug_check_no_obj_freed+0xc8/0x449 lib/debugobjects.c:998 kmem_cache_free+0x185/0x320 mm/slab.c:3693 putname+0xe1/0x120 fs/namei.c:259 do_sys_openat2+0x43a/0x740 fs/open.c:1155 do_sys_open+0xc3/0x140 fs/open.c:1162 do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xb3 RIP: 0033:0x7f5362a96840 Code: 73 01 c3 48 8b 0d 68 77 20 00 f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 83 3d 89 bb 20 00 00 75 10 b8 02 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 31 c3 48 83 ec 08 e8 1e f6 ff ff 48 89 04 24 RSP: 002b:00007ffcaf4f57e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 00007ffcaf4f5af0 RCX: 00007f5362a96840 RDX: 00000000000001a0 RSI: 0000000000080042 RDI: 000055d2c7d22ba0 RBP: 000000000000000d R08: 0000000000000000 R09: 00000000ffffffff R10: 0000000000000069 R11: 0000000000000246 R12: 00000000ffffffff R13: 000055d2c7d15040 R14: 00007ffcaf4f5ab0 R15: 000055d2c7d222f0