netlink: 'syz-executor.0': attribute type 5 has an invalid length. netlink: 'syz-executor.5': attribute type 5 has an invalid length. netlink: 20 bytes leftover after parsing attributes in process `syz-executor.2'. INFO: task syz-executor.4:27605 blocked for more than 140 seconds. Not tainted 4.19.110-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.4 D29600 27605 8397 0x00000004 Call Trace: schedule+0x8d/0x1b0 kernel/sched/core.c:3559 __rwsem_down_write_failed_common kernel/locking/rwsem-xadd.c:589 [inline] rwsem_down_write_failed+0x774/0xc30 kernel/locking/rwsem-xadd.c:618 call_rwsem_down_write_failed+0x13/0x20 arch/x86/lib/rwsem.S:117 __down_write arch/x86/include/asm/rwsem.h:142 [inline] down_write+0x4f/0x90 kernel/locking/rwsem.c:72 register_netdevice_notifier+0x7b/0x5a0 net/core/dev.c:1643 bcm_init+0x1a3/0x210 net/can/bcm.c:1502 can_create+0x27c/0x4a0 net/can/af_can.c:184 __sock_create+0x3d5/0x740 net/socket.c:1276 sock_create net/socket.c:1316 [inline] __sys_socket+0xef/0x200 net/socket.c:1346 __do_sys_socket net/socket.c:1355 [inline] __se_sys_socket net/socket.c:1353 [inline] __x64_sys_socket+0x6f/0xb0 net/socket.c:1353 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45c849 Code: Bad RIP value. RSP: 002b:00007f21f665fc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000029 RAX: ffffffffffffffda RBX: 00007f21f66606d4 RCX: 000000000045c849 RDX: 0000000000000002 RSI: 0000000000000002 RDI: 000000000000001d RBP: 000000000076bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000b67 R14: 00000000004cd99c R15: 000000000076bf0c INFO: task syz-executor.4:27607 blocked for more than 140 seconds. Not tainted 4.19.110-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.4 D28048 27607 8397 0x00000004 Call Trace: schedule+0x8d/0x1b0 kernel/sched/core.c:3559 __rwsem_down_write_failed_common kernel/locking/rwsem-xadd.c:589 [inline] rwsem_down_write_failed+0x774/0xc30 kernel/locking/rwsem-xadd.c:618 call_rwsem_down_write_failed+0x13/0x20 arch/x86/lib/rwsem.S:117 __down_write arch/x86/include/asm/rwsem.h:142 [inline] down_write+0x4f/0x90 kernel/locking/rwsem.c:72 register_netdevice_notifier+0x7b/0x5a0 net/core/dev.c:1643 bcm_init+0x1a3/0x210 net/can/bcm.c:1502 can_create+0x27c/0x4a0 net/can/af_can.c:184 __sock_create+0x3d5/0x740 net/socket.c:1276 sock_create net/socket.c:1316 [inline] __sys_socket+0xef/0x200 net/socket.c:1346 __do_sys_socket net/socket.c:1355 [inline] __se_sys_socket net/socket.c:1353 [inline] __x64_sys_socket+0x6f/0xb0 net/socket.c:1353 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45c849 Code: Bad RIP value. RSP: 002b:00007f21f663ec78 EFLAGS: 00000246 ORIG_RAX: 0000000000000029 RAX: ffffffffffffffda RBX: 00007f21f663f6d4 RCX: 000000000045c849 RDX: 0000000000000002 RSI: 0000000000000002 RDI: 000000000000001d RBP: 000000000076bfa0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000b67 R14: 00000000004cd99c R15: 000000000076bfac Showing all locks held in the system: 1 lock held by khungtaskd/1080: #0: 0000000099a0aaa1 (rcu_read_lock){....}, at: debug_show_all_locks+0x53/0x265 kernel/locking/lockdep.c:4436 2 locks held by kworker/u4:5/2413: 1 lock held by rsyslogd/8217: #0: 00000000c893d339 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xe3/0x100 fs/file.c:767 2 locks held by getty/8339: #0: 00000000211f68ec (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:272 #1: 00000000842ee48d (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x217/0x1a50 drivers/tty/n_tty.c:2154 2 locks held by getty/8340: #0: 000000007df48586 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:272 #1: 00000000d7581b48 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x217/0x1a50 drivers/tty/n_tty.c:2154 2 locks held by getty/8341: #0: 00000000474928a6 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:272 #1: 0000000015884054 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x217/0x1a50 drivers/tty/n_tty.c:2154 2 locks held by getty/8342: #0: 00000000432afa4c (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:272 #1: 000000008c196f1c (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x217/0x1a50 drivers/tty/n_tty.c:2154 2 locks held by getty/8343: #0: 000000001c8dc17d (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:272 #1: 000000003b1d3150 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x217/0x1a50 drivers/tty/n_tty.c:2154 2 locks held by getty/8344: #0: 000000000032903d (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:272 #1: 000000005e6db050 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x217/0x1a50 drivers/tty/n_tty.c:2154 2 locks held by getty/8345: #0: 00000000d7c64154 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:272 #1: 00000000d735d880 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x217/0x1a50 drivers/tty/n_tty.c:2154 4 locks held by kworker/u4:1/15453: #0: 000000007a4e8ae2 ((wq_completion)"%s""netns"){+.+.}, at: __write_once_size include/linux/compiler.h:220 [inline] #0: 000000007a4e8ae2 ((wq_completion)"%s""netns"){+.+.}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: 000000007a4e8ae2 ((wq_completion)"%s""netns"){+.+.}, at: atomic64_set include/asm-generic/atomic-instrumented.h:40 [inline] #0: 000000007a4e8ae2 ((wq_completion)"%s""netns"){+.+.}, at: atomic_long_set include/asm-generic/atomic-long.h:59 [inline] #0: 000000007a4e8ae2 ((wq_completion)"%s""netns"){+.+.}, at: set_work_data kernel/workqueue.c:617 [inline] #0: 000000007a4e8ae2 ((wq_completion)"%s""netns"){+.+.}, at: set_work_pool_and_clear_pending kernel/workqueue.c:644 [inline] #0: 000000007a4e8ae2 ((wq_completion)"%s""netns"){+.+.}, at: process_one_work+0x81a/0x1640 kernel/workqueue.c:2124 #1: 0000000054b0a19b (net_cleanup_work){+.+.}, at: process_one_work+0x84e/0x1640 kernel/workqueue.c:2128 #2: 0000000004dae3da (pernet_ops_rwsem){++++}, at: cleanup_net+0xa8/0x850 net/core/net_namespace.c:520 #3: 0000000028b04b07 (rcu_preempt_state.barrier_mutex){+.+.}, at: _rcu_barrier+0x59/0x430 kernel/rcu/tree.c:3430 1 lock held by syz-executor.4/27605: #0: 0000000004dae3da (pernet_ops_rwsem){++++}, at: register_netdevice_notifier+0x7b/0x5a0 net/core/dev.c:1643 1 lock held by syz-executor.4/27607: #0: 0000000004dae3da (pernet_ops_rwsem){++++}, at: register_netdevice_notifier+0x7b/0x5a0 net/core/dev.c:1643 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1080 Comm: khungtaskd Not tainted 4.19.110-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+0x63/0xa2 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1a6/0x1eb lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:203 [inline] watchdog+0x962/0xe40 kernel/hung_task.c:287 kthread+0x34a/0x420 kernel/kthread.c:246 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 3770 Comm: udevd Not tainted 4.19.110-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__lock_release kernel/locking/lockdep.c:3709 [inline] RIP: 0010:lock_release+0x389/0x820 kernel/locking/lockdep.c:3922 Code: 5e 04 00 00 83 c2 01 49 89 ae 70 08 00 00 44 89 fe 4c 89 f7 e8 88 ea ff ff 85 c0 75 38 48 b8 00 00 00 00 00 fc ff df 4c 89 ea <41> 83 e5 07 48 c1 ea 03 41 83 c5 03 0f b6 04 02 41 38 c5 7c 08 84 RSP: 0018:ffff8880959efc28 EFLAGS: 00000046 RAX: dffffc0000000000 RBX: 1ffff11012b3df89 RCX: 1ffff11012b3c516 RDX: ffffffff8b6d19a0 RSI: 0000000000000001 RDI: ffff8880959e2040 RBP: 0000000000000000 R08: 0000000000000000 R09: ffffed1012a891b1 R10: ffffed1012a891b0 R11: ffff888095448d83 R12: ffffffff81b90cbb R13: ffffffff8b6d19a0 R14: ffff8880959e2040 R15: 0000000000000001 FS: 00007fadb6e0e7a0(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffff600400 CR3: 000000009590f000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:166 [inline] _raw_spin_unlock_irq+0x17/0x80 kernel/locking/spinlock.c:192 spin_unlock_irq include/linux/spinlock.h:379 [inline] ep_poll+0x37b/0xd10 fs/eventpoll.c:1832 do_epoll_wait+0x1ac/0x200 fs/eventpoll.c:2198 __do_sys_epoll_wait fs/eventpoll.c:2208 [inline] __se_sys_epoll_wait fs/eventpoll.c:2205 [inline] __x64_sys_epoll_wait+0x93/0xf0 fs/eventpoll.c:2205 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7fadb6522943 Code: 00 31 d2 48 29 c2 64 89 11 48 83 c8 ff eb ea 90 90 90 90 90 90 90 90 83 3d b5 dc 2a 00 00 75 13 49 89 ca b8 e8 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 34 c3 48 83 ec 08 e8 3b c4 00 00 48 89 04 24 RSP: 002b:00007fff77238fc8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e8 RAX: ffffffffffffffda RBX: 0000000000000bb8 RCX: 00007fadb6522943 RDX: 0000000000000008 RSI: 00007fff772390c0 RDI: 000000000000000a RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000001 R10: 0000000000000bb8 R11: 0000000000000246 R12: 0000000000000003 R13: 0000000000000000 R14: 00000000017dc200 R15: 00000000017d0030