INFO: task syz-executor.5:30095 blocked for more than 143 seconds. Not tainted 5.3.0-rc5+ #140 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.5 D28160 30095 18376 0x00000004 Call Trace: context_switch kernel/sched/core.c:3254 [inline] __schedule+0x755/0x1580 kernel/sched/core.c:3880 schedule+0xa8/0x270 kernel/sched/core.c:3944 rwsem_down_write_slowpath+0x708/0xf60 kernel/locking/rwsem.c:1214 __down_write kernel/locking/rwsem.c:1365 [inline] down_write+0x13c/0x150 kernel/locking/rwsem.c:1501 unregister_netdevice_notifier+0x7e/0x390 net/core/dev.c:1713 bcm_release+0x93/0x5e0 net/can/bcm.c:1474 __sock_release+0xce/0x280 net/socket.c:590 sock_close+0x1e/0x30 net/socket.c:1268 __fput+0x2ff/0x890 fs/file_table.c:280 ____fput+0x16/0x20 fs/file_table.c:313 task_work_run+0x145/0x1c0 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:188 [inline] exit_to_usermode_loop+0x316/0x380 arch/x86/entry/common.c:163 prepare_exit_to_usermode arch/x86/entry/common.c:194 [inline] syscall_return_slowpath arch/x86/entry/common.c:274 [inline] do_syscall_64+0x5a9/0x6a0 arch/x86/entry/common.c:299 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x413511 Code: f9 fe ff b9 07 00 00 00 48 89 44 24 08 4c 89 e7 31 c0 f3 48 ab 48 89 ef 4c 89 74 24 10 bd 01 00 00 00 e8 a2 f9 fe ff 83 c0 02 6e 00 00 00 4c 89 e6 83 f8 6e 89 df 48 c7 44 24 28 01 00 00 00 RSP: 002b:00007fffd21814f0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000004 RCX: 0000000000413511 RDX: fffffffffffffff7 RSI: 0000000000000001 RDI: 0000000000000003 RBP: 0000000000000000 R08: ffffffffffffffff R09: ffffffffffffffff R10: 00007fffd2181420 R11: 0000000000000293 R12: 0000000000000001 R13: 00007fffd2181530 R14: 0000000000000000 R15: 00007fffd2181540 Showing all locks held in the system: 1 lock held by khungtaskd/1057: #0: 000000006628fb64 (rcu_read_lock){....}, at: debug_show_all_locks+0x5f/0x27e kernel/locking/lockdep.c:5256 1 lock held by rsyslogd/7868: #0: 00000000d02d46df (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xee/0x110 fs/file.c:801 2 locks held by getty/7958: #0: 000000008be31daa (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340 #1: 00000000e814657e (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 drivers/tty/n_tty.c:2156 2 locks held by getty/7959: #0: 00000000c35dd48e (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340 #1: 00000000a74c68ef (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 drivers/tty/n_tty.c:2156 2 locks held by getty/7960: #0: 00000000f41840eb (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340 #1: 00000000df04b8de (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 drivers/tty/n_tty.c:2156 2 locks held by getty/7961: #0: 000000000b5928c1 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340 #1: 0000000038c85980 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 drivers/tty/n_tty.c:2156 2 locks held by getty/7962: #0: 00000000dfd99279 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340 #1: 00000000abf09d7f (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 drivers/tty/n_tty.c:2156 2 locks held by getty/7963: #0: 00000000c3e9b5c8 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340 #1: 00000000cb7679bc (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 drivers/tty/n_tty.c:2156 2 locks held by getty/7964: #0: 0000000031050db9 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340 #1: 0000000067cfd904 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 drivers/tty/n_tty.c:2156 4 locks held by kworker/u4:4/24707: #0: 000000009c98087d ((wq_completion)netns){+.+.}, at: __write_once_size include/linux/compiler.h:226 [inline] #0: 000000009c98087d ((wq_completion)netns){+.+.}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: 000000009c98087d ((wq_completion)netns){+.+.}, at: atomic64_set include/asm-generic/atomic-instrumented.h:855 [inline] #0: 000000009c98087d ((wq_completion)netns){+.+.}, at: atomic_long_set include/asm-generic/atomic-long.h:40 [inline] #0: 000000009c98087d ((wq_completion)netns){+.+.}, at: set_work_data kernel/workqueue.c:620 [inline] #0: 000000009c98087d ((wq_completion)netns){+.+.}, at: set_work_pool_and_clear_pending kernel/workqueue.c:647 [inline] #0: 000000009c98087d ((wq_completion)netns){+.+.}, at: process_one_work+0x88b/0x1740 kernel/workqueue.c:2240 #1: 000000003fc09531 (net_cleanup_work){+.+.}, at: process_one_work+0x8c1/0x1740 kernel/workqueue.c:2244 #2: 000000007ebad75a (pernet_ops_rwsem){++++}, at: cleanup_net+0xae/0xa60 net/core/net_namespace.c:556 #3: 000000004925dee0 (rtnl_mutex){+.+.}, at: rtnl_lock+0x17/0x20 net/core/rtnetlink.c:72 2 locks held by syz-executor.5/30095: #0: 00000000f536121f (&sb->s_type->i_mutex_key#12){+.+.}, at: inode_lock include/linux/fs.h:778 [inline] #0: 00000000f536121f (&sb->s_type->i_mutex_key#12){+.+.}, at: __sock_release+0x89/0x280 net/socket.c:589 #1: 000000007ebad75a (pernet_ops_rwsem){++++}, at: unregister_netdevice_notifier+0x7e/0x390 net/core/dev.c:1713 1 lock held by syz-executor.0/30164: #0: 000000007ebad75a (pernet_ops_rwsem){++++}, at: copy_net_ns+0x26d/0x41f net/core/net_namespace.c:471 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1057 Comm: khungtaskd Not tainted 5.3.0-rc5+ #140 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+0x172/0x1f0 lib/dump_stack.c:113 nmi_cpu_backtrace.cold+0x70/0xb2 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x23b/0x28b 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:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:205 [inline] watchdog+0x9d0/0xef0 kernel/hung_task.c:289 kthread+0x361/0x430 kernel/kthread.c:255 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: 24707 Comm: kworker/u4:4 Not tainted 5.3.0-rc5+ #140 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: netns cleanup_net RIP: 0010:arch_stack_walk+0x9/0xf0 arch/x86/kernel/stacktrace.c:17 Code: c2 01 ee ee eb d0 e6 81 eb f0 e6 87 eb ec e6 83 eb e8 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 55 48 89 e5 41 56 49 89 d6 <41> 55 49 89 cd 41 54 49 89 f4 53 48 89 fb 48 83 ec 68 65 48 8b 04 RSP: 0018:ffff8880ae9095b8 EFLAGS: 00000246 RAX: ffff888062c8e200 RBX: ffffed1015d212ba RCX: 0000000000000000 RDX: ffff888062c8e200 RSI: ffff8880ae9095f0 RDI: ffffffff81616740 RBP: ffff8880ae9095c0 R08: 1ffffffff14a9555 R09: ffffed101301dc9c R10: fffffbfff14a9555 R11: ffffffff8a54aaaf R12: 0000000000000001 R13: 0000000000000040 R14: ffff888062c8e200 R15: ffff8880a99b4a80 FS: 0000000000000000(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f784d794000 CR3: 000000009aa08000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: stack_trace_save+0xac/0xe0 kernel/stacktrace.c:123 save_stack+0x23/0x90 mm/kasan/common.c:69 set_track mm/kasan/common.c:77 [inline] __kasan_kmalloc mm/kasan/common.c:487 [inline] __kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:460 kasan_slab_alloc+0xf/0x20 mm/kasan/common.c:495 slab_post_alloc_hook mm/slab.h:520 [inline] slab_alloc mm/slab.c:3319 [inline] kmem_cache_alloc+0x121/0x710 mm/slab.c:3483 __build_skb+0x26/0x70 net/core/skbuff.c:310 __netdev_alloc_skb+0x255/0x440 net/core/skbuff.c:463 netdev_alloc_skb include/linux/skbuff.h:2757 [inline] dev_alloc_skb include/linux/skbuff.h:2770 [inline] br_send_bpdu.isra.0.constprop.0+0xa1/0xa70 net/bridge/br_stp_bpdu.c:40 br_send_config_bpdu+0x68c/0x7a0 net/bridge/br_stp_bpdu.c:120 br_transmit_config.part.0+0x517/0x780 net/bridge/br_stp.c:203 br_transmit_config net/bridge/br_stp.c:364 [inline] br_config_bpdu_generation+0x1d2/0x230 net/bridge/br_stp.c:362 br_hello_timer_expired+0xab/0x190 net/bridge/br_stp_timer.c:37 call_timer_fn+0x1ac/0x780 kernel/time/timer.c:1322 expire_timers kernel/time/timer.c:1366 [inline] __run_timers kernel/time/timer.c:1685 [inline] __run_timers kernel/time/timer.c:1653 [inline] run_timer_softirq+0x697/0x17a0 kernel/time/timer.c:1698 __do_softirq+0x262/0x98c kernel/softirq.c:292 invoke_softirq kernel/softirq.c:373 [inline] irq_exit+0x19b/0x1e0 kernel/softirq.c:413 exiting_irq arch/x86/include/asm/apic.h:537 [inline] smp_apic_timer_interrupt+0x1a3/0x610 arch/x86/kernel/apic/apic.c:1095 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:830 RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:768 [inline] RIP: 0010:console_trylock_spinning kernel/printk/printk.c:1741 [inline] RIP: 0010:vprintk_emit+0x5df/0x700 kernel/printk/printk.c:1985 Code: 00 48 b8 00 00 00 00 00 fc ff df 41 80 3c 06 00 0f 85 f8 00 00 00 48 83 3d 6d f2 76 07 00 74 6a e8 86 70 16 00 48 89 df 57 9d <0f> 1f 44 00 00 e9 06 ff ff ff e8 72 70 16 00 49 c1 ee 03 e8 69 ec RSP: 0018:ffff888021f8f4b0 EFLAGS: 00000293 ORIG_RAX: ffffffffffffff13 RAX: ffff888062c8e200 RBX: 0000000000000293 RCX: 0000000000000006 RDX: 0000000000000000 RSI: ffffffff815c00aa RDI: 0000000000000293 RBP: ffff888021f8f4f8 R08: 1ffffffff14a9543 R09: fffffbfff14a9544 R10: fffffbfff14a9543 R11: ffffffff8a54aa1f R12: 0000000000000036 R13: 0000000000000200 R14: 1ffffffff11a5e62 R15: ffff8880a7dec380 vprintk_default+0x28/0x30 kernel/printk/printk.c:2013 vprintk_func+0x7e/0x189 kernel/printk/printk_safe.c:386 printk+0xba/0xed kernel/printk/printk.c:2046 kobject_uevent_env+0xe2/0x101d lib/kobject_uevent.c:476 kobject_uevent+0x20/0x26 lib/kobject_uevent.c:641 kobject_cleanup lib/kobject.c:680 [inline] kobject_release lib/kobject.c:722 [inline] kref_put include/linux/kref.h:65 [inline] kobject_put.cold+0x177/0x2e6 lib/kobject.c:739 net_rx_queue_update_kobjects+0x359/0x470 net/core/net-sysfs.c:970 remove_queue_kobjects net/core/net-sysfs.c:1557 [inline] netdev_unregister_kobject+0x151/0x1f0 net/core/net-sysfs.c:1708 rollback_registered_many+0x6bb/0xdd0 net/core/dev.c:8263 unregister_netdevice_many.part.0+0x1b/0x1f0 net/core/dev.c:9347 unregister_netdevice_many+0x3b/0x50 net/core/dev.c:9346 ieee80211_remove_interfaces+0x3d0/0x820 net/mac80211/iface.c:1963 ieee80211_unregister_hw+0x4c/0x230 net/mac80211/main.c:1328 mac80211_hwsim_del_radio+0x289/0x3b0 drivers/net/wireless/mac80211_hwsim.c:3035 hwsim_exit_net+0x553/0xc4b drivers/net/wireless/mac80211_hwsim.c:3784 ops_exit_list.isra.0+0xaa/0x150 net/core/net_namespace.c:172 cleanup_net+0x4e2/0xa60 net/core/net_namespace.c:594 process_one_work+0x9af/0x1740 kernel/workqueue.c:2269 worker_thread+0x98/0xe40 kernel/workqueue.c:2415 kthread+0x361/0x430 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352