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issue on: HEAD commit: 982312090977 Add linux-next specific files for 20251103 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=17b2932f980000 kernel config: https://syzkaller.appspot.com/x/.config?x=43cc0e31558cb527 dashboard link: https://syzkaller.appspot.com/bug?extid=1957b26299cf3ff7890c compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1347817c580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/40058f8a830c/disk-98231209.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/1d7f42e8639f/vmlinux-98231209.xz kernel image: https://storage.googleapis.com/syzbot-assets/d8bb0284f393/bzImage-98231209.xz The issue was bisected to: commit 3c9820d5c64aeaadea7ffe3a6bb99d019a5ff46a Author: Christian Brauner Date: Wed Oct 29 12:20:24 2025 +0000 ns: add active reference count bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=101e9bcd980000 final oops: https://syzkaller.appspot.com/x/report.txt?x=121e9bcd980000 console output: https://syzkaller.appspot.com/x/log.txt?x=141e9bcd980000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+1957b26299cf3ff7890c@syzkaller.appspotmail.com Fixes: 3c9820d5c64a ("ns: add active reference count") ------------[ cut here ]------------ WARNING: ./include/linux/ns_common.h:229 at __ns_ref_put include/linux/ns_common.h:229 [inline], CPU#0: kworker/0:6/6108 WARNING: ./include/linux/ns_common.h:229 at put_user_ns include/linux/user_namespace.h:189 [inline], CPU#0: kworker/0:6/6108 WARNING: ./include/linux/ns_common.h:229 at destroy_super_work+0x15c/0x1a0 fs/super.c:280, CPU#0: kworker/0:6/6108 Modules linked in: CPU: 0 UID: 0 PID: 6108 Comm: kworker/0:6 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025 Workqueue: events destroy_super_work RIP: 0010:__ns_ref_put include/linux/ns_common.h:229 [inline] RIP: 0010:put_user_ns include/linux/user_namespace.h:189 [inline] RIP: 0010:destroy_super_work+0x15c/0x1a0 fs/super.c:280 Code: 90 63 ff 48 81 c3 a8 fc ff ff 48 89 df e8 ec 90 63 ff 4c 89 f7 5b 41 5c 41 5d 41 5e 41 5f 5d e9 8a 91 e1 ff e8 45 df 86 ff 90 <0f> 0b 90 e9 6d ff ff ff e8 37 df 86 ff 4c 89 e7 be 03 00 00 00 e8 RSP: 0018:ffffc900030d7a48 EFLAGS: 00010293 RAX: ffffffff823a294b RBX: ffff88805639c898 RCX: ffff88802ab59e80 RDX: 0000000000000000 RSI: 0000000000000004 RDI: 0000000000000000 RBP: 0000000000000004 R08: ffff88807477565b R09: 1ffff1100e8eeacb R10: dffffc0000000000 R11: ffffed100e8eeacc R12: ffff888074775658 R13: dffffc0000000000 R14: ffff88805639c000 R15: ffff8880747754c8 FS: 0000000000000000(0000) GS:ffff888125eda000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000c008044000 CR3: 0000000077ad4000 CR4: 00000000003526f0 Call Trace: process_one_work+0x94a/0x15d0 kernel/workqueue.c:3267 process_scheduled_works kernel/workqueue.c:3350 [inline] worker_thread+0x9b0/0xee0 kernel/workqueue.c:3431 kthread+0x711/0x8a0 kernel/kthread.c:463 ret_from_fork+0x52d/0xa70 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 --- 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. For information about bisection process see: https://goo.gl/tpsmEJ#bisection 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