netlink: 3 bytes leftover after parsing attributes in process `syz-executor.0'. netlink: 3 bytes leftover after parsing attributes in process `syz-executor.0'. INFO: task syz-executor.5:1860 blocked for more than 140 seconds. Not tainted 4.19.38 #6 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.5 D29512 1860 16888 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:1642 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:00007f799f0d5c78 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: 00007f799f0d66d4 R13: 00000000004c73ad R14: 00000000004dd088 R15: 00000000ffffffff Showing all locks held in the system: kobject: 'batman_adv' (0000000036677f4e): kobject_uevent_env 7 locks held by kworker/u4:3/134: kobject: 'batman_adv' (0000000036677f4e): kobject_uevent_env: filter function caused the event to drop! 1 lock held by khungtaskd/1032: kobject: 'batman_adv' (0000000036677f4e): kobject_cleanup, parent (null) kobject: 'batman_adv' (0000000036677f4e): calling ktype release kobject: (0000000036677f4e): dynamic_kobj_release kobject: 'batman_adv': free name #0: kobject: 'rx-0' (0000000096f9458a): kobject_cleanup, parent 00000000a9ebc10b 00000000b7d28c02 kobject: 'rx-0' (0000000096f9458a): auto cleanup 'remove' event ( kobject: 'rx-0' (0000000096f9458a): kobject_uevent_env rcu_read_lock kobject: 'rx-0' (0000000096f9458a): kobject_uevent_env: uevent_suppress caused the event to drop! ){....} kobject: 'rx-0' (0000000096f9458a): auto cleanup kobject_del , at: debug_show_all_locks+0x5f/0x27e kernel/locking/lockdep.c:4435 kobject: 'rx-0' (0000000096f9458a): calling ktype release 1 lock held by rsyslogd/7698: kobject: 'rx-0': free name #0: kobject: 'tx-3' (00000000a45d5337): kobject_cleanup, parent 00000000a9ebc10b 00000000ba97c90a kobject: 'tx-3' (00000000a45d5337): auto cleanup 'remove' event ( kobject: 'tx-3' (00000000a45d5337): kobject_uevent_env &f->f_pos_lock kobject: 'tx-3' (00000000a45d5337): kobject_uevent_env: uevent_suppress caused the event to drop! ){+.+.} kobject: 'tx-3' (00000000a45d5337): auto cleanup kobject_del , at: __fdget_pos+0xee/0x110 fs/file.c:767 kobject: 'tx-3' (00000000a45d5337): calling ktype release 2 locks held by getty/7820: kobject: 'tx-3': free name #0: 00000000cccb9b29 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:363 kobject: 'tx-2' (00000000e4885bef): kobject_cleanup, parent 00000000a9ebc10b #1: 000000008632b168 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b30 drivers/tty/n_tty.c:2154 kobject: 'tx-2' (00000000e4885bef): auto cleanup 'remove' event 2 locks held by getty/7821: kobject: 'tx-2' (00000000e4885bef): kobject_uevent_env #0: 0000000070bdf05d (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:363 kobject: 'tx-2' (00000000e4885bef): kobject_uevent_env: uevent_suppress caused the event to drop! #1: 00000000b399abcb (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b30 drivers/tty/n_tty.c:2154 kobject: 'tx-2' (00000000e4885bef): auto cleanup kobject_del 2 locks held by getty/7822: kobject: 'tx-2' (00000000e4885bef): calling ktype release #0: 000000003be2b67c (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:363 kobject: 'tx-2': free name #1: 00000000fe641fab (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b30 drivers/tty/n_tty.c:2154 kobject: 'tx-1' (00000000ff656582): kobject_cleanup, parent 00000000a9ebc10b 2 locks held by getty/7823: kobject: 'tx-1' (00000000ff656582): auto cleanup 'remove' event #0: kobject: 'tx-1' (00000000ff656582): kobject_uevent_env kobject: 'tx-1' (00000000ff656582): kobject_uevent_env: uevent_suppress caused the event to drop! 000000003030f374 kobject: 'tx-1' (00000000ff656582): auto cleanup kobject_del ( kobject: 'tx-1' (00000000ff656582): calling ktype release &tty->ldisc_sem kobject: 'tx-1': free name ){++++} kobject: 'tx-0' (0000000052521ff7): kobject_cleanup, parent 00000000a9ebc10b , at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:363 kobject: 'tx-0' (0000000052521ff7): auto cleanup 'remove' event #1: kobject: 'tx-0' (0000000052521ff7): kobject_uevent_env 00000000508602a8 kobject: 'tx-0' (0000000052521ff7): kobject_uevent_env: uevent_suppress caused the event to drop! ( kobject: 'tx-0' (0000000052521ff7): auto cleanup kobject_del &ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b30 drivers/tty/n_tty.c:2154 kobject: 'tx-0' (0000000052521ff7): calling ktype release 2 locks held by getty/7824: kobject: 'tx-0': free name #0: 0000000011f53291 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:363 kobject: 'queues' (00000000a9ebc10b): kobject_cleanup, parent (null) #1: 00000000b5284b2c (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b30 drivers/tty/n_tty.c:2154 kobject: 'queues' (00000000a9ebc10b): calling ktype release 2 locks held by getty/7825: #0: 000000001673f73a (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:363 kobject: 'queues' (00000000a9ebc10b): kset_release #1: 00000000a96f9bf2 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b30 drivers/tty/n_tty.c:2154 kobject: 'queues': free name 2 locks held by getty/7826: #0: 000000004f773440 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:363 kobject: 'wlan2323' (00000000967a35f1): kobject_uevent_env #1: 000000007f83f4ce (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b30 drivers/tty/n_tty.c:2154 kobject: 'wlan2323' (00000000967a35f1): kobject_uevent_env: uevent_suppress caused the event to drop! 1 lock held by syz-executor.5/1860: #0: 000000008a81fb68 (pernet_ops_rwsem){++++}, at: register_netdevice_notifier+0x7e/0x630 net/core/dev.c:1642 kobject: 'net' (000000004c8779c7): kobject_cleanup, parent (null) 1 lock held by syz-executor.5/1863: #0: 000000008a81fb68 (pernet_ops_rwsem){++++}, at: register_netdevice_notifier+0x7e/0x630 net/core/dev.c:1642 kobject: 'net' (000000004c8779c7): calling ktype release ============================================= kobject: 'net': free name NMI backtrace for cpu 1 CPU: 1 PID: 1032 Comm: khungtaskd Not tainted 4.19.38 #6 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 kobject: 'wlan2323' (00000000967a35f1): kobject_cleanup, parent (null) 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 kobject: 'wlan2323' (00000000967a35f1): auto cleanup 'remove' event kobject: 'wlan2323' (00000000967a35f1): kobject_uevent_env nmi_trigger_cpumask_backtrace+0x1b0/0x1f8 lib/nmi_backtrace.c:62 kobject: 'wlan2323' (00000000967a35f1): kobject_uevent_env: uevent_suppress caused the event to drop! 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 kobject: 'wlan2323' (00000000967a35f1): calling ktype release Sending NMI from CPU 1 to CPUs 0: kobject: 'wlan2323': free name NMI backtrace for cpu 0 CPU: 0 PID: 134 Comm: kworker/u4:3 Not tainted 4.19.38 #6 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: netns cleanup_net RIP: 0010:preempt_count arch/x86/include/asm/preempt.h:23 [inline] RIP: 0010:check_kcov_mode kernel/kcov.c:67 [inline] RIP: 0010:write_comp_data+0x9/0x70 kernel/kcov.c:122 Code: 12 00 00 8b 80 d4 12 00 00 48 8b 11 48 83 c2 01 48 39 d0 76 07 48 89 34 d1 48 89 11 5d c3 0f 1f 00 65 4c 8b 04 25 40 ee 01 00 <65> 8b 05 80 7d 96 7e a9 00 01 1f 00 75 51 41 8b 80 d0 12 00 00 83 RSP: 0018:ffff8880a9517398 EFLAGS: 00000046 RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff86ed3256 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000001 RBP: ffff8880a95173a0 R08: ffff8880a95084c0 R09: fffffbfff10f26a1 R10: fffffbfff10f26a0 R11: ffffffff88793503 R12: ffff8880a95174e0 R13: ffffffff8a31e260 R14: ffff8880a9517438 R15: ffff8880a9517520 FS: 0000000000000000(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffff600400 CR3: 00000000a8b5c000 CR4: 00000000001426f0 Call Trace: format_decode+0xe6/0xc30 lib/vsprintf.c:2007 vsnprintf+0x17e/0x1af0 lib/vsprintf.c:2245 sprintf+0xc0/0x100 lib/vsprintf.c:2495 print_time kernel/printk/printk.c:1229 [inline] print_prefix+0x386/0x3f0 kernel/printk/printk.c:1252 msg_print_text+0xc9/0x1c0 kernel/printk/printk.c:1279 console_unlock+0x392/0x10c0 kernel/printk/printk.c:2384 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:667 [inline] kobject_release lib/kobject.c:691 [inline] kref_put include/linux/kref.h:70 [inline] kobject_put.cold+0x2b1/0x2ec lib/kobject.c:708 netdev_run_todo+0x5cc/0x7d0 net/core/dev.c:8802 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