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charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 6537cfb395f3 Merge tag 'sound-6.14-rc4' of git://git.kerne.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=16a327f8580000 kernel config: https://syzkaller.appspot.com/x/.config?x=61cbf5ac8a063ad4 dashboard link: https://syzkaller.appspot.com/bug?extid=30a19e01a97420719891 compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=10bf9ae4580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=13d89498580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/ae2568ec9e34/disk-6537cfb3.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/19be7179f649/vmlinux-6537cfb3.xz kernel image: https://storage.googleapis.com/syzbot-assets/bd8a168d2027/bzImage-6537cfb3.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+30a19e01a97420719891@syzkaller.appspotmail.com proc_sctp_do_udp_port+0x380/0x450 net/sctp/sysctl.c:555 proc_sys_call_handler+0x3c6/0x5a0 fs/proc/proc_sysctl.c:601 iter_file_splice_write+0x90f/0x10b0 fs/splice.c:743 do_splice_from fs/splice.c:941 [inline] direct_splice_actor+0x18f/0x6c0 fs/splice.c:1164 splice_direct_to_actor+0x346/0xa40 fs/splice.c:1108 do_splice_direct_actor fs/splice.c:1207 [inline] do_splice_direct+0x178/0x250 fs/splice.c:1233 do_sendfile+0xafb/0xe40 fs/read_write.c:1363 __do_sys_sendfile64 fs/read_write.c:1424 [inline] __se_sys_sendfile64 fs/read_write.c:1410 [inline] __x64_sys_sendfile64+0x1da/0x220 fs/read_write.c:1410 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f ------------[ cut here ]------------ WARNING: CPU: 0 PID: 12 at lib/ref_tracker.c:179 ref_tracker_dir_exit+0x3e3/0x680 lib/ref_tracker.c:179 Modules linked in: CPU: 0 UID: 0 PID: 12 Comm: kworker/u8:1 Not tainted 6.14.0-rc3-syzkaller-00060-g6537cfb395f3 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024 Workqueue: netns cleanup_net RIP: 0010:ref_tracker_dir_exit+0x3e3/0x680 lib/ref_tracker.c:179 Code: 11 02 00 00 4d 39 f5 49 8b 06 4d 89 f7 0f 85 0e ff ff ff 48 8b 2c 24 e8 5b 16 c8 fc 48 8b 74 24 18 48 89 ef e8 6e bd 65 06 90 <0f> 0b 90 e8 45 16 c8 fc 48 8d 5d 44 be 04 00 00 00 48 89 df e8 c4 RSP: 0018:ffffc90000117ac8 EFLAGS: 00010246 RAX: 0000000000000000 RBX: dffffc0000000000 RCX: 0000000000000000 RDX: 0000000000000001 RSI: ffffffff8b6ceca0 RDI: 0000000000000001 RBP: ffff88802f7b01e0 R08: 0000000000000001 R09: fffffbfff2dd79b7 R10: ffffffff96ebcdbf R11: 0000000000002ba2 R12: ffff88802f7b0230 R13: ffff88802f7b0230 R14: ffff88802f7b0230 R15: ffff88802f7b0230 FS: 0000000000000000(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000557010814f20 CR3: 000000000df80000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: net_free net/core/net_namespace.c:473 [inline] net_free net/core/net_namespace.c:467 [inline] cleanup_net+0x99f/0xbf0 net/core/net_namespace.c:675 process_one_work+0x9c5/0x1ba0 kernel/workqueue.c:3236 process_scheduled_works kernel/workqueue.c:3317 [inline] worker_thread+0x6c8/0xf00 kernel/workqueue.c:3398 kthread+0x3af/0x750 kernel/kthread.c:464 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@googlegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing. If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup