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charset="UTF-8" Hello, syzbot has tested the proposed patch but the reproducer is still triggering an issue: WARNING in cleanup_net create_new_namespaces+0x425/0x7b0 kernel/nsproxy.c:110 unshare_nsproxy_namespaces+0x124/0x180 kernel/nsproxy.c:228 ksys_unshare+0x619/0xc10 kernel/fork.c:3323 __do_sys_unshare kernel/fork.c:3394 [inline] __se_sys_unshare kernel/fork.c:3392 [inline] __x64_sys_unshare+0x38/0x40 kernel/fork.c:3392 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f ------------[ cut here ]------------ WARNING: CPU: 1 PID: 12 at lib/ref_tracker.c:179 ref_tracker_dir_exit+0x411/0x550 lib/ref_tracker.c:179 Modules linked in: CPU: 1 PID: 12 Comm: kworker/u8:1 Not tainted 6.10.0-rc5-syzkaller-01200-gcda91d5b911a-dirty #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024 Workqueue: netns cleanup_net RIP: 0010:ref_tracker_dir_exit+0x411/0x550 lib/ref_tracker.c:179 Code: 48 8b 1c 24 48 89 df 48 8b 74 24 20 e8 88 f2 ab 06 eb 1a e8 f1 b7 ad fc 48 8b 1c 24 48 89 df 48 8b 74 24 20 e8 70 f2 ab 06 90 <0f> 0b 90 48 83 c3 44 48 89 df be 04 00 00 00 e8 5b 7f 13 fd 48 89 RSP: 0018:ffffc900001179e0 EFLAGS: 00010246 RAX: ae4fba0a5aa06400 RBX: ffff888024fb1ed8 RCX: 0000000000000001 RDX: dffffc0000000000 RSI: ffffffff8bcabb40 RDI: 0000000000000001 RBP: ffffc90000117ab0 R08: ffffffff92fbc65f R09: 1ffffffff25f78cb R10: dffffc0000000000 R11: fffffbfff25f78cc R12: 1ffff110045b9468 R13: dead000000000100 R14: ffff888024fb1f28 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000559ce218b950 CR3: 000000000e132000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: net_free net/core/net_namespace.c:465 [inline] cleanup_net+0xbf3/0xcc0 net/core/net_namespace.c:661 process_one_work kernel/workqueue.c:3248 [inline] process_scheduled_works+0xa2c/0x1830 kernel/workqueue.c:3329 worker_thread+0x86d/0xd50 kernel/workqueue.c:3409 kthread+0x2f0/0x390 kernel/kthread.c:389 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Tested on: commit: cda91d5b sctp: cancel a blocking accept when shutdown .. git tree: net-next console output: https://syzkaller.appspot.com/x/log.txt?x=1287deb9980000 kernel config: https://syzkaller.appspot.com/x/.config?x=5264b58fdff6e881 dashboard link: https://syzkaller.appspot.com/bug?extid=d6eb9cee2885ec06f5e3 compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 patch: https://syzkaller.appspot.com/x/patch.diff?x=128b109e980000