INFO: task syz-executor.1:12049 blocked for more than 143 seconds. Not tainted 5.13.0-rc5-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.1 state:D stack:26232 pid:12049 ppid: 8439 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:4339 [inline] __schedule+0xb98/0x1120 kernel/sched/core.c:5147 schedule+0x14b/0x200 kernel/sched/core.c:5226 rwsem_down_write_slowpath+0xe52/0x1590 kernel/locking/rwsem.c:1106 __down_write_common kernel/locking/rwsem.c:1261 [inline] __down_write kernel/locking/rwsem.c:1270 [inline] down_write+0x165/0x170 kernel/locking/rwsem.c:1407 register_netdevice_notifier+0xad/0xa80 net/core/dev.c:1902 raw_init+0x1ef/0x300 net/can/raw.c:339 can_create+0x247/0x450 net/can/af_can.c:168 __sock_create+0x59b/0x8c0 net/socket.c:1408 sock_create net/socket.c:1459 [inline] __sys_socket+0x115/0x350 net/socket.c:1501 __do_sys_socket net/socket.c:1510 [inline] __se_sys_socket net/socket.c:1508 [inline] __x64_sys_socket+0x76/0x80 net/socket.c:1508 do_syscall_64+0x3f/0xb0 arch/x86/entry/common.c:47 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x4665d9 RSP: 002b:00007f0457c50188 EFLAGS: 00000246 ORIG_RAX: 0000000000000029 RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 00000000004665d9 RDX: 0000000000000001 RSI: 0000000000000003 RDI: 000000000000001d RBP: 00000000004bfcb9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf80 R13: 00007ffd2568f30f R14: 00007f0457c50300 R15: 0000000000022000 Showing all locks held in the system: 1 lock held by khungtaskd/1633: #0: ffffffff8cf15cc0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30 arch/x86/pci/mmconfig_64.c:151 1 lock held by in:imklog/8104: #0: ffff88801dba14f0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x24e/0x2f0 fs/file.c:974 3 locks held by kworker/u4:9/12026: #0: ffff88814013b138 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work+0x7aa/0x10c0 kernel/workqueue.c:2249 #1: ffffc90009b37d20 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work+0x7e8/0x10c0 kernel/workqueue.c:2251 #2: ffffffff8df1fa30 (pernet_ops_rwsem){++++}-{3:3}, at: cleanup_net+0xf0/0xc60 net/core/net_namespace.c:557 1 lock held by syz-executor.1/12049: #0: ffffffff8df1fa30 (pernet_ops_rwsem){++++}-{3:3}, at: register_netdevice_notifier+0xad/0xa80 net/core/dev.c:1902 1 lock held by syz-executor.4/12216: #0: ffffffff8df1fa30 (pernet_ops_rwsem){++++}-{3:3}, at: copy_net_ns+0x378/0x5e0 net/core/net_namespace.c:470 1 lock held by syz-executor.2/12218: #0: ffffffff8df1fa30 (pernet_ops_rwsem){++++}-{3:3}, at: copy_net_ns+0x378/0x5e0 net/core/net_namespace.c:470 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1633 Comm: khungtaskd Not tainted 5.13.0-rc5-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:79 [inline] dump_stack+0x202/0x31e lib/dump_stack.c:120 nmi_cpu_backtrace+0x16c/0x190 lib/nmi_backtrace.c:105 nmi_trigger_cpumask_backtrace+0x191/0x2f0 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:209 [inline] watchdog+0xcfb/0xd40 kernel/hung_task.c:294 kthread+0x39a/0x3c0 kernel/kthread.c:313 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 4846 Comm: systemd-journal Not tainted 5.13.0-rc5-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:sb_permission fs/namei.c:466 [inline] RIP: 0010:inode_permission+0x1c/0x500 fs/namei.c:493 Code: 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 55 41 57 41 56 41 55 41 54 53 48 83 ec 18 41 89 d6 48 89 f5 49 89 ff e8 24 68 aa ff <44> 89 f6 83 e6 02 31 ff e8 27 6c aa ff 44 89 f3 49 bc 00 00 00 00 RSP: 0018:ffffc9000138fa50 EFLAGS: 00000293 RAX: ffffffff81d4b0ec RBX: ffffc9000138fcd0 RCX: ffff88801710b880 RDX: 0000000000000000 RSI: ffff88802abb7100 RDI: ffffffff8cdc4060 RBP: ffff88802abb7100 R08: ffffffff81d6033d R09: fffff52000271f96 R10: fffff52000271f96 R11: 0000000000000000 R12: ffffc9000138fca0 R13: dffffc0000000000 R14: 0000000000000001 R15: ffffffff8cdc4060 FS: 00007efc59f238c0(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007efc57352000 CR3: 00000000155df000 CR4: 00000000001506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: may_lookup fs/namei.c:1659 [inline] link_path_walk+0x2c2/0xcf0 fs/namei.c:2211 path_lookupat+0xab/0x9d0 fs/namei.c:2420 filename_lookup+0x259/0x6e0 fs/namei.c:2454 user_path_at include/linux/namei.h:60 [inline] do_faccessat+0x408/0x910 fs/open.c:425 do_syscall_64+0x3f/0xb0 arch/x86/entry/common.c:47 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7efc591de9c7 Code: 83 c4 08 48 3d 01 f0 ff ff 73 01 c3 48 8b 0d c8 d4 2b 00 f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 b8 15 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d a1 d4 2b 00 f7 d8 64 89 01 48 RSP: 002b:00007ffc50c32b78 EFLAGS: 00000246 ORIG_RAX: 0000000000000015 RAX: ffffffffffffffda RBX: 00007ffc50c35ba0 RCX: 00007efc591de9c7 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000055e8c3d229a3 RBP: 00007ffc50c32cc0 R08: 000055e8c3d183e5 R09: 0000000000000018 R10: 0000000000000069 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 000055e8c4b9b8a0 R15: 00007ffc50c331b0