From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-ot1-f79.google.com (mail-ot1-f79.google.com [209.85.210.79]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 0130435F176 for ; Fri, 20 Mar 2026 22:45:29 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.210.79 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774046731; cv=none; b=WJUbVikzIO3s4LwjEuRk7agF6D8E0vPkY1xnRKQU4mo9Q3zzUxeTqcEYdQfgHWn7y75PXlAQQcDmnadq6iSa2fIS+Ev+TtJObF0GTS53BptpvPGX2zO6SGVKpVwFl+YDFrSJw7EN21MLS9smDg/DJkpNiH2Zp99DEBltZaiebLI= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774046731; c=relaxed/simple; bh=a2n4pSBqcR34c6G9cUVfmgqIMwOzvDup0ASey2sbvUQ=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=AOz5ntQ9awmEhbH94liCExqFjyMUPTu10mzGc1RdW5qWKKq79SQLaMdS+In1jP/RYPbYOFx9TIsqlpm7tCOpKAuU/MUQHQ65VMKkjPbdSClqHfF+3rzHRfEgbTBtXBGsn4lYY7wfXwv1YTENQO70P0on3DRpJZyVv0SsMg335CE= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com; arc=none smtp.client-ip=209.85.210.79 Authentication-Results: smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com Received: by mail-ot1-f79.google.com with SMTP id 46e09a7af769-7d7e660f1e2so18743309a34.3 for ; Fri, 20 Mar 2026 15:45:29 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1774046729; x=1774651529; h=to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=ZAtC2lhbG2YZSINlOyiGuI6fYnHaFTjqBNqsFUizz1c=; b=ZiSYbTQMR4fVhVdq5RevynJg/6v4t+to3kdBoxnwmFMP1v4Js+NBZhr7ywVB1Pfudm YHDTACLZoro6rSOAuIYjFfyU9HGZSyvjazWcEn7mGwd4IHKq5NpqdJLpTVL/3Gk/Im8Z fQ3r5yV3aia7lbs+GaPStN241M9X+KG/qVXC+mbJSTIMsme5aRHvEJPUcV40/cGU8aea Q5a0nr51HxHgFn4UGIezvKKwx+64ANPyFeDzjoDDe/HvPeV/fHNhgg/cHAUtj7zFbIva x7x9r/WbEx4bi6gnStXVcG35BlEZ3z0rv6STKZGSkgMBRaEMoH11gc1Rgxxhiz2UfOy+ TyKQ== X-Forwarded-Encrypted: i=1; AJvYcCWqHj10MZhujoNkrGm6ADfGGFcLsZ9xQ6EGmOTjW1JmsTwHOmMHE+/ICtxcmjVW3wsWjHVUbNT6gS9eFqxS@vger.kernel.org X-Gm-Message-State: AOJu0YyZTZ3vhcst7N7NWFutfJhKmwj3MvV8x5o5vlxFsT2qEzqpOqpo 2chsB24XOJbUl9AIWDGq8NRyZ1ir6ajDCJytwLflJlTzXOE4RnMPg3GgAmm/xawp4KDpujMyexo rQKG3KPBpYvzPOwZiwSFAq1cS2H2xhcABw4R7DfU6OlPHKre8l5d6KyQreKg= Precedence: bulk X-Mailing-List: linux-fsdevel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:1389:b0:67b:f0ed:7fcd with SMTP id 006d021491bc7-67c231260c9mr3504098eaf.70.1774046729007; Fri, 20 Mar 2026 15:45:29 -0700 (PDT) Date: Fri, 20 Mar 2026 15:45:28 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <69bdce08.050a0220.3bf4de.0031.GAE@google.com> Subject: [syzbot] [fs?] general protection fault in __umount_mnt From: syzbot To: brauner@kernel.org, jack@suse.cz, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com, viro@zeniv.linux.org.uk Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 8e42d2514a7e Add linux-next specific files for 20260318 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=10808cba580000 kernel config: https://syzkaller.appspot.com/x/.config?x=7f5b21566f9d8af6 dashboard link: https://syzkaller.appspot.com/bug?extid=e4470cc28308f2081ec8 compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=16eb72da580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/cb90c31a24db/disk-8e42d251.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/e0c08a5de437/vmlinux-8e42d251.xz kernel image: https://storage.googleapis.com/syzbot-assets/d6b18a5e03f8/bzImage-8e42d251.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+e4470cc28308f2081ec8@syzkaller.appspotmail.com Oops: general protection fault, probably for non-canonical address 0xfbd59c0000000024: 0000 [#1] SMP KASAN PTI KASAN: maybe wild-memory-access in range [0xdead000000000120-0xdead000000000127] CPU: 1 UID: 0 PID: 15793 Comm: syz.3.4827 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 RIP: 0010:__hlist_del include/linux/list.h:992 [inline] RIP: 0010:hlist_del_init include/linux/list.h:1020 [inline] RIP: 0010:__umount_mnt+0x24e/0x490 fs/namespace.c:997 Code: 85 e4 74 61 4d 8d be f8 00 00 00 4c 89 f8 48 c1 e8 03 80 3c 28 00 74 08 4c 89 ff e8 fc 33 e3 ff 4d 8b 2f 4c 89 e0 48 c1 e8 03 <80> 3c 28 00 74 08 4c 89 e7 e8 d4 34 e3 ff 4d 89 2c 24 4d 85 ed 74 RSP: 0018:ffffc90003297a40 EFLAGS: 00010a06 RAX: 1bd5a00000000024 RBX: ffff8880338796c8 RCX: ffff888029f08000 RDX: 0000000000000000 RSI: ffffffff8e8d9060 RDI: ffff888033879738 RBP: dffffc0000000000 R08: ffffffff90122ff7 R09: 1ffffffff20245fe R10: dffffc0000000000 R11: fffffbfff20245ff R12: dead000000000122 R13: dead000000000100 R14: ffff8880338796c0 R15: ffff8880338797b8 FS: 0000555561679500(0000) GS:ffff888125536000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f0ebc84eddd CR3: 00000000791b8000 CR4: 00000000003526f0 Call Trace: umount_mnt fs/namespace.c:1008 [inline] umount_tree+0x925/0xd90 fs/namespace.c:1819 put_mnt_ns+0x1d6/0x2f0 fs/namespace.c:6264 evict+0x61e/0xb10 fs/inode.c:846 __dentry_kill+0x1a2/0x5e0 fs/dcache.c:670 finish_dput+0xc9/0x480 fs/dcache.c:879 __fput+0x697/0x8c0 fs/file_table.c:508 task_work_run+0x1d9/0x270 kernel/task_work.c:233 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] __exit_to_user_mode_loop kernel/entry/common.c:67 [inline] exit_to_user_mode_loop+0xed/0x480 kernel/entry/common.c:98 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:238 [inline] syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:269 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:325 [inline] do_syscall_64+0x32d/0xf80 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f14bbb9c799 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffd2857c408 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4 RAX: 0000000000000000 RBX: 00007f14bbe17da0 RCX: 00007f14bbb9c799 RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003 RBP: 00007f14bbe17da0 R08: 00007f14bbe16038 R09: 0000000000000000 R10: 000000000003fdc0 R11: 0000000000000246 R12: 0000000000033731 R13: 00007f14bbe1609c R14: 000000000003345d R15: 00007f14bbe16090 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:__hlist_del include/linux/list.h:992 [inline] RIP: 0010:hlist_del_init include/linux/list.h:1020 [inline] RIP: 0010:__umount_mnt+0x24e/0x490 fs/namespace.c:997 Code: 85 e4 74 61 4d 8d be f8 00 00 00 4c 89 f8 48 c1 e8 03 80 3c 28 00 74 08 4c 89 ff e8 fc 33 e3 ff 4d 8b 2f 4c 89 e0 48 c1 e8 03 <80> 3c 28 00 74 08 4c 89 e7 e8 d4 34 e3 ff 4d 89 2c 24 4d 85 ed 74 RSP: 0018:ffffc90003297a40 EFLAGS: 00010a06 RAX: 1bd5a00000000024 RBX: ffff8880338796c8 RCX: ffff888029f08000 RDX: 0000000000000000 RSI: ffffffff8e8d9060 RDI: ffff888033879738 RBP: dffffc0000000000 R08: ffffffff90122ff7 R09: 1ffffffff20245fe R10: dffffc0000000000 R11: fffffbfff20245ff R12: dead000000000122 R13: dead000000000100 R14: ffff8880338796c0 R15: ffff8880338797b8 FS: 0000555561679500(0000) GS:ffff888125536000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f0ebc84eddd CR3: 00000000791b8000 CR4: 00000000003526f0 ---------------- Code disassembly (best guess): 0: 85 e4 test %esp,%esp 2: 74 61 je 0x65 4: 4d 8d be f8 00 00 00 lea 0xf8(%r14),%r15 b: 4c 89 f8 mov %r15,%rax e: 48 c1 e8 03 shr $0x3,%rax 12: 80 3c 28 00 cmpb $0x0,(%rax,%rbp,1) 16: 74 08 je 0x20 18: 4c 89 ff mov %r15,%rdi 1b: e8 fc 33 e3 ff call 0xffe3341c 20: 4d 8b 2f mov (%r15),%r13 23: 4c 89 e0 mov %r12,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 80 3c 28 00 cmpb $0x0,(%rax,%rbp,1) <-- trapping instruction 2e: 74 08 je 0x38 30: 4c 89 e7 mov %r12,%rdi 33: e8 d4 34 e3 ff call 0xffe3350c 38: 4d 89 2c 24 mov %r13,(%r12) 3c: 4d 85 ed test %r13,%r13 3f: 74 .byte 0x74 --- 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