__sys_sendmsg+0xe5/0x1b0 net/socket.c:2496 do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline] __do_fast_syscall_32+0x65/0xf0 arch/x86/entry/common.c:178 do_fast_syscall_32+0x2f/0x70 arch/x86/entry/common.c:203 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c ------------[ cut here ]------------ WARNING: CPU: 2 PID: 3721 at lib/ref_tracker.c:38 spin_unlock_irqrestore include/linux/spinlock.h:404 [inline] WARNING: CPU: 2 PID: 3721 at lib/ref_tracker.c:38 ref_tracker_dir_exit.cold+0x137/0x1e3 lib/ref_tracker.c:37 Modules linked in: CPU: 2 PID: 3721 Comm: kworker/u16:2 Not tainted 5.17.0-rc2-syzkaller-00060-g88808fbbead4 #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014 Workqueue: netns cleanup_net RIP: 0010:ref_tracker_dir_exit.cold+0x137/0x1e3 lib/ref_tracker.c:38 Code: 4c 89 ef e8 c4 26 a9 f8 4c 8b 3c 24 4c 39 fd 49 8b 07 0f 85 b5 00 00 00 e8 ff e4 61 f8 48 8b 74 24 10 4c 89 e7 e8 52 78 36 00 <0f> 0b e9 1e 2b ea fa 4c 89 ff e8 93 26 a9 f8 e9 d4 fe ff ff e8 79 RSP: 0018:ffffc9000294f978 EFLAGS: 00010246 RAX: 0000000000000000 RBX: dffffc0000000000 RCX: 0000000000000000 RDX: 0000000000000001 RSI: 0000000000000001 RDI: 0000000000000001 RBP: ffff8880511dc600 R08: 0000000000000001 R09: ffffffff8ffbd94f R10: 0000000000000001 R11: 0000000000088078 R12: ffff8880511dc5b8 R13: ffff8880511dc600 R14: ffff8880511dc600 R15: ffff8880511dc600 FS: 0000000000000000(0000) GS:ffff88802cc00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000f6fab5dc CR3: 000000001ef64000 CR4: 0000000000150ee0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: free_netdev+0x32a/0x5b0 net/core/dev.c:10288 netdev_run_todo+0x6c3/0xaa0 net/core/dev.c:9962 default_device_exit_batch+0x2ff/0x3c0 net/core/dev.c:10946 ops_exit_list+0x125/0x170 net/core/net_namespace.c:173 cleanup_net+0x4ea/0xb00 net/core/net_namespace.c:597 process_one_work+0x9ac/0x1650 kernel/workqueue.c:2307 worker_thread+0x657/0x1110 kernel/workqueue.c:2454 kthread+0x2e9/0x3a0 kernel/kthread.c:377 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295