BTRFS error (device loop4): open_ctree failed INFO: task syz-executor.3:19225 blocked for more than 140 seconds. Not tainted 4.19.37 #5 kobject: 'phy1755' (000000007f634287): kobject_uevent_env kobject: 'phy1755' (000000007f634287): fill_kobj_path: path = '/devices/virtual/mac80211_hwsim/hwsim1756/ieee80211/phy1755' "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.3 D29496 19225 19076 0x00000004 kobject: 'ieee80211' (000000002adb9059): kobject_cleanup, parent (null) Call Trace: context_switch kernel/sched/core.c:2826 [inline] __schedule+0x813/0x1d00 kernel/sched/core.c:3474 kobject: 'ieee80211' (000000002adb9059): calling ktype release kobject: 'ieee80211': free name kobject: 'hwsim1756' (00000000deab32a5): kobject_uevent_env schedule+0x92/0x1c0 kernel/sched/core.c:3518 kobject: 'hwsim1756' (00000000deab32a5): fill_kobj_path: path = '/devices/virtual/mac80211_hwsim/hwsim1756' __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: 'hwsim1756' (00000000deab32a5): kobject_uevent_env call_rwsem_down_write_failed+0x17/0x30 arch/x86/lib/rwsem.S:117 kobject: 'hwsim1756' (00000000deab32a5): fill_kobj_path: path = '/devices/virtual/mac80211_hwsim/hwsim1756' __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 kobject: 'hwsim1756' (00000000deab32a5): kobject_cleanup, parent (null) kobject: 'hwsim1756' (00000000deab32a5): calling ktype release kobject: 'hwsim1756': free name kobject: 'phy1755' (000000007f634287): kobject_cleanup, parent (null) kobject: 'phy1755' (000000007f634287): calling ktype release kobject: 'rfkill1717' (0000000046d63a9b): kobject_cleanup, parent (null) raw_init+0x299/0x340 net/can/raw.c:343 kobject: 'rfkill1717' (0000000046d63a9b): calling ktype release kobject: 'rfkill1717': free name kobject: 'phy1755': free name 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:00007f21dd085c78 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: 00007f21dd0866d4 R13: 00000000004c73ad R14: 00000000004dd088 R15: 00000000ffffffff INFO: task syz-executor.3:19228 blocked for more than 140 seconds. Not tainted 4.19.37 #5 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.3 D29496 19228 19076 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:00007f21dd064c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000029 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000458da9 RDX: 0000000000000001 RSI: 0000000000000003 RDI: 000000000000001d RBP: 000000000073bfa0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f21dd0656d4 R13: 00000000004c73ad R14: 00000000004dd088 R15: 00000000ffffffff Showing all locks held in the system: 1 lock held by khungtaskd/1031: #0: 000000006d8b7c9c (rcu_read_lock){....}, at: debug_show_all_locks+0x5f/0x27e kernel/locking/lockdep.c:4435 1 lock held by rsyslogd/7374: #0: 00000000e190ad71 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xee/0x110 fs/file.c:767 2 locks held by getty/7495: #0: 0000000052c7c374 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:363 #1: 00000000c2524721 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b30 drivers/tty/n_tty.c:2154 2 locks held by getty/7496: #0: 000000005fee8849 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:363 #1: 0000000022f61033 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b30 drivers/tty/n_tty.c:2154 2 locks held by getty/7497: #0: 00000000adffff19 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:363 #1: 00000000e8cce248 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b30 drivers/tty/n_tty.c:2154 2 locks held by getty/7498: #0: 00000000c49651c0 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:363 #1: 000000008e1d6fdf (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b30 drivers/tty/n_tty.c:2154 2 locks held by getty/7499: #0: 0000000056690a4d (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:363 #1: 00000000f1978e90 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b30 drivers/tty/n_tty.c:2154 2 locks held by getty/7500: #0: 000000001a2c1fae (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:363 #1: 000000003de1b00b (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b30 drivers/tty/n_tty.c:2154 2 locks held by getty/7501: #0: 0000000041227fca (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:363 #1: 000000009bdc0666 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b30 drivers/tty/n_tty.c:2154 4 locks held by kworker/u4:3/15403: #0: 000000008c48d5df ((wq_completion)"%s""netns"){+.+.}, at: __write_once_size include/linux/compiler.h:220 [inline] #0: 000000008c48d5df ((wq_completion)"%s""netns"){+.+.}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: 000000008c48d5df ((wq_completion)"%s""netns"){+.+.}, at: atomic64_set include/asm-generic/atomic-instrumented.h:40 [inline] #0: 000000008c48d5df ((wq_completion)"%s""netns"){+.+.}, at: atomic_long_set include/asm-generic/atomic-long.h:59 [inline] #0: 000000008c48d5df ((wq_completion)"%s""netns"){+.+.}, at: set_work_data kernel/workqueue.c:617 [inline] #0: 000000008c48d5df ((wq_completion)"%s""netns"){+.+.}, at: set_work_pool_and_clear_pending kernel/workqueue.c:644 [inline] #0: 000000008c48d5df ((wq_completion)"%s""netns"){+.+.}, at: process_one_work+0x87e/0x1760 kernel/workqueue.c:2124 #1: 000000003fe85f0e (net_cleanup_work){+.+.}, at: process_one_work+0x8b4/0x1760 kernel/workqueue.c:2128 #2: 0000000073420b4d (pernet_ops_rwsem){++++}, at: cleanup_net+0xae/0x960 net/core/net_namespace.c:519 #3: 000000002dda7ae8 (rtnl_mutex){+.+.}, at: rtnl_lock+0x17/0x20 net/core/rtnetlink.c:77 1 lock held by syz-executor.3/19225: #0: 0000000073420b4d (pernet_ops_rwsem){++++}, at: register_netdevice_notifier+0x7e/0x630 net/core/dev.c:1642 1 lock held by syz-executor.3/19228: #0: 0000000073420b4d (pernet_ops_rwsem){++++}, at: register_netdevice_notifier+0x7e/0x630 net/core/dev.c:1642 ============================================= kobject: 'batman_adv' (00000000ddf1598c): kobject_uevent_env NMI backtrace for cpu 0 CPU: 0 PID: 1031 Comm: khungtaskd Not tainted 4.19.37 #5 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 kobject: 'batman_adv' (00000000ddf1598c): kobject_uevent_env: filter function caused the event to drop! 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: 'batman_adv' (00000000ddf1598c): kobject_cleanup, parent (null) nmi_trigger_cpumask_backtrace+0x1b0/0x1f8 lib/nmi_backtrace.c:62 kobject: 'batman_adv' (00000000ddf1598c): calling ktype release 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 kobject: (00000000ddf1598c): dynamic_kobj_release ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:413 kobject: 'batman_adv': free name Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 10 Comm: rcu_preempt Not tainted 4.19.37 #5 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:rcu_advance_cbs+0x72/0xf0 kernel/rcu/tree.c:1812 Code: 07 85 c0 75 67 4d 8d 7d 38 4c 89 ff e8 27 2f 01 00 45 31 c0 84 c0 75 0d 41 5c 44 89 c0 41 5d 41 5e 41 5f 5d c3 49 8d 7c 24 38 <48> b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 75 RSP: 0018:ffff8880aa247cb8 EFLAGS: 00000002 RAX: dffffc0000000001 RBX: ffffffff8879f880 RCX: ffff8880aa238b00 RDX: 1ffff11015d25b6f RSI: ffffffff8879f898 RDI: ffffffff8879f8b8 RBP: ffff8880aa247cd8 R08: 0000000000000000 R09: fffffbfff10f3f11 R10: fffffbfff10f3f10 R11: ffffffff8879f883 R12: ffffffff8879f880 R13: ffff8880ae92db40 R14: ffffffff8879f880 R15: ffff8880ae92db78 FS: 0000000000000000(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000458d7f CR3: 00000000a9bcd000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __note_gp_changes+0x469/0x590 kernel/rcu/tree.c:1838 rcu_gp_cleanup kernel/rcu/tree.c:2117 [inline] rcu_gp_kthread+0x174f/0x2190 kernel/rcu/tree.c:2244 kthread+0x357/0x430 kernel/kthread.c:246 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:413