INFO: task syz-executor.2:29331 blocked for more than 140 seconds. Not tainted 4.19.36 #4 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.2 D28728 29331 7912 0x00000004 Call Trace: context_switch kernel/sched/core.c:2826 [inline] __schedule+0x813/0x1d00 kernel/sched/core.c:3474 schedule+0x92/0x1c0 kernel/sched/core.c:3518 __rwsem_down_write_failed_common kernel/locking/rwsem-xadd.c:573 [inline] rwsem_down_write_failed+0x774/0xcc0 kernel/locking/rwsem-xadd.c:602 call_rwsem_down_write_failed+0x17/0x30 arch/x86/lib/rwsem.S:117 __down_write arch/x86/include/asm/rwsem.h:142 [inline] down_write+0x53/0x90 kernel/locking/rwsem.c:72 register_netdevice_notifier+0x7e/0x630 net/core/dev.c:1628 raw_init+0x299/0x340 net/can/raw.c:343 can_create+0x28a/0x4b0 net/can/af_can.c:183 __sock_create+0x3e6/0x750 net/socket.c:1276 sock_create net/socket.c:1316 [inline] __sys_socket+0x103/0x220 net/socket.c:1346 __do_sys_socket net/socket.c:1355 [inline] __se_sys_socket net/socket.c:1353 [inline] __x64_sys_socket+0x73/0xb0 net/socket.c:1353 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x458da9 Code: Bad RIP value. RSP: 002b:00007f94da7cdc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000029 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000458da9 RDX: 0000000000000001 RSI: 0000000000000003 RDI: 000000000000001d RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f94da7ce6d4 R13: 00000000004c73ad R14: 00000000004dd088 R15: 00000000ffffffff INFO: task syz-executor.2:29820 blocked for more than 140 seconds. Not tainted 4.19.36 #4 kobject: 'batman_adv' (000000005a128af6): kobject_uevent_env "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.2 D kobject: 'batman_adv' (000000005a128af6): kobject_uevent_env: filter function caused the event to drop! 28728 29820 7912 0x00000004 kobject: 'batman_adv' (000000005a128af6): kobject_cleanup, parent (null) Call Trace: context_switch kernel/sched/core.c:2826 [inline] __schedule+0x813/0x1d00 kernel/sched/core.c:3474 schedule+0x92/0x1c0 kernel/sched/core.c:3518 kobject: 'batman_adv' (000000005a128af6): calling ktype release __rwsem_down_write_failed_common kernel/locking/rwsem-xadd.c:573 [inline] rwsem_down_write_failed+0x774/0xcc0 kernel/locking/rwsem-xadd.c:602 kobject: (000000005a128af6): dynamic_kobj_release kobject: 'batman_adv': free name kobject: 'rx-0' (00000000b1a29f42): kobject_cleanup, parent 00000000f2ab14a4 kobject: 'rx-0' (00000000b1a29f42): auto cleanup 'remove' event call_rwsem_down_write_failed+0x17/0x30 arch/x86/lib/rwsem.S:117 __down_write arch/x86/include/asm/rwsem.h:142 [inline] down_write+0x53/0x90 kernel/locking/rwsem.c:72 register_netdevice_notifier+0x7e/0x630 net/core/dev.c:1628 raw_init+0x299/0x340 net/can/raw.c:343 can_create+0x28a/0x4b0 net/can/af_can.c:183 __sock_create+0x3e6/0x750 net/socket.c:1276 kobject: 'rx-0' (00000000b1a29f42): kobject_uevent_env sock_create net/socket.c:1316 [inline] __sys_socket+0x103/0x220 net/socket.c:1346 kobject: 'rx-0' (00000000b1a29f42): kobject_uevent_env: uevent_suppress caused the event to drop! kobject: 'rx-0' (00000000b1a29f42): auto cleanup kobject_del kobject: 'rx-0' (00000000b1a29f42): calling ktype release __do_sys_socket net/socket.c:1355 [inline] __se_sys_socket net/socket.c:1353 [inline] __x64_sys_socket+0x73/0xb0 net/socket.c:1353 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x458da9 Code: Bad RIP value. kobject: 'rx-0': free name RSP: 002b:00007f94da78bc78 EFLAGS: 00000246 kobject: 'tx-3' (000000003d258747): kobject_cleanup, parent 00000000f2ab14a4 ORIG_RAX: 0000000000000029 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000458da9 RDX: 0000000000000001 RSI: 0000000000000003 RDI: 000000000000001d RBP: 000000000073c040 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f94da78c6d4 R13: 00000000004c73ad R14: 00000000004dd088 R15: 00000000ffffffff Showing all locks held in the system: kobject: 'tx-3' (000000003d258747): auto cleanup 'remove' event 7 locks held by kworker/u4:2/81: kobject: 'tx-3' (000000003d258747): kobject_uevent_env 1 lock held by khungtaskd/1032: kobject: 'tx-3' (000000003d258747): kobject_uevent_env: uevent_suppress caused the event to drop! #0: kobject: 'tx-3' (000000003d258747): auto cleanup kobject_del 00000000e5280321 ( kobject: 'tx-3' (000000003d258747): calling ktype release rcu_read_lock kobject: 'tx-3': free name ){....}, at: debug_show_all_locks+0x5f/0x27e kernel/locking/lockdep.c:4438 2 locks held by getty/7869: kobject: 'tx-2' (000000009743bf7e): kobject_cleanup, parent 00000000f2ab14a4 #0: kobject: 'tx-2' (000000009743bf7e): auto cleanup 'remove' event 0000000053d794ab kobject: 'tx-2' (000000009743bf7e): kobject_uevent_env ( kobject: 'tx-2' (000000009743bf7e): kobject_uevent_env: uevent_suppress caused the event to drop! &tty->ldisc_sem kobject: 'tx-2' (000000009743bf7e): auto cleanup kobject_del ){++++} kobject: 'tx-2' (000000009743bf7e): calling ktype release , at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:363 kobject: 'tx-2': free name #1: kobject: 'tx-1' (000000007d9476ac): kobject_cleanup, parent 00000000f2ab14a4 000000009dd45a27 kobject: 'tx-1' (000000007d9476ac): auto cleanup 'remove' event (&ldata->atomic_read_lock kobject: 'tx-1' (000000007d9476ac): kobject_uevent_env ){+.+.} kobject: 'tx-1' (000000007d9476ac): kobject_uevent_env: uevent_suppress caused the event to drop! , at: n_tty_read+0x232/0x1b30 drivers/tty/n_tty.c:2154 kobject: 'tx-1' (000000007d9476ac): auto cleanup kobject_del 2 locks held by getty/7870: kobject: 'tx-1' (000000007d9476ac): calling ktype release #0: kobject: 'tx-1': free name 00000000580b4c2d kobject: 'tx-0' (0000000021e80d36): kobject_cleanup, parent 00000000f2ab14a4 (&tty->ldisc_sem kobject: 'tx-0' (0000000021e80d36): auto cleanup 'remove' event ){++++} kobject: 'tx-0' (0000000021e80d36): kobject_uevent_env , at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:363 kobject: 'tx-0' (0000000021e80d36): kobject_uevent_env: uevent_suppress caused the event to drop! #1: kobject: 'tx-0' (0000000021e80d36): auto cleanup kobject_del 00000000c80b646e kobject: 'tx-0' (0000000021e80d36): calling ktype release ( kobject: 'tx-0': free name &ldata->atomic_read_lock kobject: 'queues' (00000000f2ab14a4): kobject_cleanup, parent (null) ){+.+.} kobject: 'queues' (00000000f2ab14a4): calling ktype release , at: n_tty_read+0x232/0x1b30 drivers/tty/n_tty.c:2154 kobject: 'queues' (00000000f2ab14a4): kset_release 2 locks held by getty/7871: kobject: 'queues': free name #0: kobject: 'wlan2524' (00000000f21a57ab): kobject_uevent_env 0000000086bc9114 kobject: 'wlan2524' (00000000f21a57ab): kobject_uevent_env: uevent_suppress caused the event to drop! ( kobject: 'net' (0000000010323782): kobject_cleanup, parent (null) &tty->ldisc_sem kobject: 'net' (0000000010323782): calling ktype release ){++++} kobject: 'net': free name , at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:363 #1: 00000000010e0d36 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b30 drivers/tty/n_tty.c:2154 2 locks held by getty/7872: #0: 00000000e0c51cce (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:363 #1: 00000000ebd69b76 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b30 drivers/tty/n_tty.c:2154 2 locks held by getty/7873: #0: 00000000959aa51a (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:363 #1: 00000000cf9109cd (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b30 drivers/tty/n_tty.c:2154 2 locks held by getty/7874: #0: 000000004963985c (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:363 #1: 00000000635eae50 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b30 drivers/tty/n_tty.c:2154 2 locks held by getty/7875: #0: 00000000c4966a07 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:363 #1: 000000002c3cf19c (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b30 drivers/tty/n_tty.c:2154 2 locks held by kworker/1:5/5370: #0: 00000000cfd6265a ((wq_completion)"rcu_gp"){+.+.}, at: __write_once_size include/linux/compiler.h:220 [inline] #0: 00000000cfd6265a ((wq_completion)"rcu_gp"){+.+.}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: 00000000cfd6265a ((wq_completion)"rcu_gp"){+.+.}, at: atomic64_set include/asm-generic/atomic-instrumented.h:40 [inline] #0: 00000000cfd6265a ((wq_completion)"rcu_gp"){+.+.}, at: atomic_long_set include/asm-generic/atomic-long.h:59 [inline] #0: 00000000cfd6265a ((wq_completion)"rcu_gp"){+.+.}, at: set_work_data kernel/workqueue.c:617 [inline] #0: 00000000cfd6265a ((wq_completion)"rcu_gp"){+.+.}, at: set_work_pool_and_clear_pending kernel/workqueue.c:644 [inline] #0: 00000000cfd6265a ((wq_completion)"rcu_gp"){+.+.}, at: process_one_work+0x87e/0x1760 kernel/workqueue.c:2124 #1: 000000008a530401 ((work_completion)(&rew.rew_work)){+.+.}, at: process_one_work+0x8b4/0x1760 kernel/workqueue.c:2128 1 lock held by syz-executor.2/29331: #0: 000000003e100e4f (pernet_ops_rwsem){++++}, at: register_netdevice_notifier+0x7e/0x630 net/core/dev.c:1628 1 lock held by syz-executor.2/29820: #0: 000000003e100e4f (pernet_ops_rwsem){++++}, at: register_netdevice_notifier+0x7e/0x630 net/core/dev.c:1628 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1032 Comm: khungtaskd Not tainted 4.19.36 #4 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+0x63/0xa4 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1b0/0x1f8 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:203 [inline] watchdog+0x9df/0xee0 kernel/hung_task.c:287 kthread+0x357/0x430 kernel/kthread.c:246 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:413 Sending NMI from CPU 0 to CPUs 1: kobject: 'wlan2524' (00000000f21a57ab): kobject_cleanup, parent (null) NMI backtrace for cpu 1 CPU: 1 PID: 81 Comm: kworker/u4:2 Not tainted 4.19.36 #4 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: netns cleanup_net RIP: 0010:io_serial_in+0x6b/0x90 drivers/tty/serial/8250/8250_port.c:450 Code: e1 00 00 00 49 8d 7c 24 38 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 d3 e3 80 3c 02 00 75 17 41 03 5c 24 38 89 da ec <5b> 0f b6 c0 41 5c 5d c3 e8 f8 f0 34 fe eb c2 e8 51 f1 34 fe eb e2 RSP: 0018:ffff8880a99e74c0 EFLAGS: 00000002 RAX: dffffc0000000060 RBX: 00000000000003fd RCX: 0000000000000000 RDX: 00000000000003fd RSI: ffffffff836cb4c1 RDI: ffffffff8ad6ce78 RBP: ffff8880a99e74d0 R08: ffff8880a99ce600 R09: fffffbfff15ad9c9 R10: fffffbfff15ad9c8 R11: ffffffff8ad6ce43 R12: ffffffff8ad6ce40 R13: 0000000000000020 R14: ffffffff8ad6ce40 R15: fffffbfff15ad9d1 FS: 0000000000000000(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000c423a038c8 CR3: 00000000a4f4c000 CR4: 00000000001406e0 Call Trace: serial_in drivers/tty/serial/8250/8250.h:111 [inline] wait_for_xmitr+0xa7/0x240 drivers/tty/serial/8250/8250_port.c:2028 serial8250_console_putchar+0x20/0x60 drivers/tty/serial/8250/8250_port.c:3199 uart_console_write+0x57/0x120 drivers/tty/serial/serial_core.c:1878 serial8250_console_write+0x651/0xa10 drivers/tty/serial/8250/8250_port.c:3265 univ8250_console_write+0x5f/0x70 drivers/tty/serial/8250/8250_core.c:590 call_console_drivers kernel/printk/printk.c:1729 [inline] console_unlock+0xbe4/0x10c0 kernel/printk/printk.c:2410 vprintk_emit+0x238/0x690 kernel/printk/printk.c:1927 vprintk_default+0x28/0x30 kernel/printk/printk.c:1968 vprintk_func+0x7e/0x189 kernel/printk/printk_safe.c:398 printk+0xba/0xed kernel/printk/printk.c:2001 kobject_cleanup lib/kobject.c:638 [inline] kobject_release lib/kobject.c:691 [inline] kref_put include/linux/kref.h:70 [inline] kobject_put.cold+0x88/0x2ec lib/kobject.c:708 netdev_run_todo+0x5cc/0x7d0 net/core/dev.c:8788 rtnl_unlock+0xe/0x10 net/core/rtnetlink.c:117 ieee80211_unregister_hw+0x51/0x280 net/mac80211/main.c:1236 mac80211_hwsim_del_radio+0x280/0x3b0 drivers/net/wireless/mac80211_hwsim.c:2995 hwsim_exit_net+0x553/0xc50 drivers/net/wireless/mac80211_hwsim.c:3664 ops_exit_list.isra.0+0xb0/0x160 net/core/net_namespace.c:153 cleanup_net+0x3fb/0x960 net/core/net_namespace.c:552 process_one_work+0x98e/0x1760 kernel/workqueue.c:2153 worker_thread+0x98/0xe40 kernel/workqueue.c:2296 kthread+0x357/0x430 kernel/kthread.c:246 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:413