do_fast_syscall_32+0x33/0x70 arch/x86/entry/common.c:203 entry_SYSENTER_compat_after_hwframe+0x70/0x82 ------------[ cut here ]------------ WARNING: CPU: 1 PID: 1093 at lib/ref_tracker.c:179 spin_unlock_irqrestore include/linux/spinlock.h:406 [inline] WARNING: CPU: 1 PID: 1093 at lib/ref_tracker.c:179 ref_tracker_dir_exit+0x3e2/0x680 lib/ref_tracker.c:178 Modules linked in: CPU: 1 PID: 1093 Comm: kworker/u16:7 Not tainted 6.6.0-rc2-syzkaller-00337-gd90b0276af8f #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 Workqueue: netns cleanup_net RIP: 0010:ref_tracker_dir_exit+0x3e2/0x680 lib/ref_tracker.c:179 Code: 85 07 02 00 00 4d 39 f5 49 8b 06 4d 89 f7 0f 85 0e ff ff ff 48 8b 2c 24 e8 4b 7b 32 fd 48 8b 74 24 18 48 89 ef e8 ce d8 ec 05 <0f> 0b e8 37 7b 32 fd 48 8d 5d 44 be 04 00 00 00 48 89 df e8 b6 34 RSP: 0018:ffffc90006ee7b78 EFLAGS: 00010246 RAX: 0000000000000000 RBX: dffffc0000000000 RCX: 0000000000000000 RDX: 0000000000000001 RSI: ffffffff8a8cab20 RDI: 0000000000000001 RBP: ffff8880591981e0 R08: 0000000000000001 R09: fffffbfff233dff7 R10: ffffffff919effbf R11: 0000000000000114 R12: ffff888059198230 R13: ffff888059198230 R14: ffff888059198230 R15: ffff888059198230 FS: 0000000000000000(0000) GS:ffff88802c700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000057ab404c CR3: 0000000070f05000 CR4: 0000000000350ee0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 00000000ffff00f1 DR6: 00000000ffff0ff0 DR7: 0000000000000400 Call Trace: net_free net/core/net_namespace.c:448 [inline] net_free net/core/net_namespace.c:442 [inline] cleanup_net+0x8d4/0xb20 net/core/net_namespace.c:635 process_one_work+0x884/0x15c0 kernel/workqueue.c:2630 process_scheduled_works kernel/workqueue.c:2703 [inline] worker_thread+0x8b9/0x1290 kernel/workqueue.c:2784 kthread+0x33c/0x440 kernel/kthread.c:388 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304