From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-oa1-f80.google.com (mail-oa1-f80.google.com [209.85.160.80]) (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 9ADD839184A for ; Mon, 1 Jun 2026 10:27:23 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.160.80 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1780309645; cv=none; b=Yy775zTmcVQDa1uaOoXSKtAnzKc6QXMXpO1BZS8wFrcbhh+nbmv9BnQX88LtbxCXOrdHFGoG7h0xTUeFDg33qg9uukTxtl5B4ZYVqOBNymZbdHdVReM1ebpUtUJJ9mxl95tUTmJoS5EVCyEgVeovX76IrcpqbSZa7YzthWjP8kI= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1780309645; c=relaxed/simple; bh=QZpjG/UzxfBrqmGrDSnbKNCojASn/9+1q3s57nBkk6A=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=pWID7Su49EgsXFRdK6Cqd6keyK/9S9vZN7QEpUEJDjFc8OvO9KNzD5X6IinbLqSSHPR+AYHp/AizQPVSsfRMQdPw2tLwr/LFD/+Z1p1rjL70O9VQ5OblTqIByhToSs+m/xVf43m2fPttXkxIUGXwjGA79EoJP+fmvdlUYwQISHU= 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=209.85.160.80 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-oa1-f80.google.com with SMTP id 586e51a60fabf-43cd2d12617so1772608fac.3 for ; Mon, 01 Jun 2026 03:27:23 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1780309642; x=1780914442; h=to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=9OAj8tpwVCz7sqt4lnsIHvwwRrgLo88h/anUIIEmmuo=; b=SHBRFTn1zBCuDnG2pVu4XATUVjsKfyLMUctPQr4+f+LNVVgAvzf48A0BvBI8YAUhOx 58cv7wyJ63y+P2cGsbypG6jg9gvVPruNBgR0Gq4Awk73H8nsR8R3vJIGH2DtZC3nNEGu Yq1ye8/dbzIM580joQEjSmTet+l5iECyahHIjbTSxBHdyHdh2MTlLPsFEroGdRWXE0GW KoKihhEZdLzHLSKaJnPJLwycFmqkGw9g9Xu+vt4dkAJnKLbgb+TYe5SaA4t07VDfF7Gq FXiI6lb3CuUzuN+r2z3QbN9eUEktuacFU7iVthtamnlUegZWtwxybrTyqGU7ihdsXVcG x1mA== X-Forwarded-Encrypted: i=1; AFNElJ8iI3ILItjBBT76Dr3L50kQNy1MLtM2xDku/hOzvuEPY7QTjtu5oReLmbd5w+kT4sXAq9hYjXbONpAoJAM=@vger.kernel.org X-Gm-Message-State: AOJu0YxPPf7qLThZXfZzOYMfR+FiVelkExWv22sHzZilX86ma3ZOb8Hh HVttnz8BHI7tBeehVaKMy2nOum7rzenzaY0ARUWYVTu2mn/bfHKVKUaAs+MvLCrCuaZZTSlAl6b KD81DSgtczuwg2UKeUV4m2Lak+MUUVZUEcGb34WnsJNOGg7ry02CsFUBn2Io= Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:150e:b0:69d:fa6b:eec6 with SMTP id 006d021491bc7-69e102b2a55mr5538336eaf.4.1780309642621; Mon, 01 Jun 2026 03:27:22 -0700 (PDT) Date: Mon, 01 Jun 2026 03:27:22 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a1d5e8a.fd5edf16.2e7427.000f.GAE@google.com> Subject: [syzbot] [fuse?] general protection fault in fuse_dev_release From: syzbot To: fuse-devel@lists.linux.dev, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, miklos@szeredi.hu, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: f7af91adc230 Add linux-next specific files for 20260528 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=14f1f57e580000 kernel config: https://syzkaller.appspot.com/x/.config?x=9ace0a34301dcd68 dashboard link: https://syzkaller.appspot.com/bug?extid=5bfc774fd6dffbbc4b70 compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/d3fc56ffd7af/disk-f7af91ad.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/ac5990ec0e63/vmlinux-f7af91ad.xz kernel image: https://storage.googleapis.com/syzbot-assets/46b531c86f46/bzImage-f7af91ad.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+5bfc774fd6dffbbc4b70@syzkaller.appspotmail.com Oops: general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] CPU: 1 UID: 0 PID: 5919 Comm: syz.3.28 Not tainted syzkaller #0 PREEMPT_{RT,(full)} Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026 RIP: 0010:list_empty include/linux/list.h:404 [inline] RIP: 0010:list_splice_init include/linux/list.h:602 [inline] RIP: 0010:fuse_dev_release+0x19c/0x670 fs/fuse/dev.c:2221 Code: 5c 24 28 48 8b 44 24 30 42 80 3c 38 00 74 08 48 89 df e8 17 22 eb fe 48 8b 0b 48 89 4c 24 18 4e 8d 24 31 4d 89 e5 49 c1 ed 03 <43> 80 7c 3d 00 00 74 08 4c 89 e7 e8 f4 21 eb fe 4d 8b 3c 24 4d 39 RSP: 0018:ffffc90005cdfc60 EFLAGS: 00010246 RAX: 1ffff110055a2853 RBX: ffff88802ad14298 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc90005cdfd40 R08: ffffffff8b325a20 R09: ffffffff8dfcac60 R10: dffffc0000000000 R11: fffffbfff1f1a07f R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: dffffc0000000000 FS: 000055559158b500(0000) GS:ffff888125fcd000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ff1eab87879 CR3: 000000003329e000 CR4: 00000000003526f0 Call Trace: __fput+0x461/0xa70 fs/file_table.c:510 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+0x193/0x680 kernel/entry/common.c:98 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline] syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:230 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:318 [inline] do_syscall_64+0x353/0x580 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fd2f2dcce59 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:00007ffe4cd86cc8 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4 RAX: 0000000000000000 RBX: 00007fd2f3047d[ 137.410093][ T5919] RAX: 0000000000000000 RBX: 00007fd2f3047da0 RCX: 00007fd2f2dcce59 RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003 RBP: 00007fd2f3047da0 R08: 0000000000000006 R09: 0000000000000000 R10: 00007fd2f3047cb0 R11: 0000000000000246 R12: 0000000000021201 R13: 00007fd2f304618c R14: 00000000000210c9 R15: 00007ffe4cd86dd0 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:list_empty include/linux/list.h:404 [inline] RIP: 0010:list_splice_init include/linux/list.h:602 [inline] RIP: 0010:fuse_dev_release+0x19c/0x670 fs/fuse/dev.c:2221 Code: 5c 24 28 48 8b 44 24 30 42 80 3c 38 00 74 08 48 89 df e8 17 22 eb fe 48 8b 0b 48 89 4c 24 18 4e 8d 24 31 4d 89 e5 49 c1 ed 03 <43> 80 7c 3d 00 00 74 08 4c 89 e7 e8 f4 21 eb fe 4d 8b 3c 24 4d 39 RSP: 0018:ffffc90005cdfc60 EFLAGS: 00010246 RAX: 1ffff110055a2853 RBX: ffff88802ad14298 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc90005cdfd40 R08: ffffffff8b325a20 R09: ffffffff8dfcac60 R10: dffffc0000000000 R11: fffffbfff1f1a07f R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: dffffc0000000000 FS: 000055559158b500(0000) GS:ffff888125fcd000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ff1eab87879 CR3: 000000003329e000 CR4: 00000000003526f0 ---------------- Code disassembly (best guess): 0: 5c pop %rsp 1: 24 28 and $0x28,%al 3: 48 8b 44 24 30 mov 0x30(%rsp),%rax 8: 42 80 3c 38 00 cmpb $0x0,(%rax,%r15,1) d: 74 08 je 0x17 f: 48 89 df mov %rbx,%rdi 12: e8 17 22 eb fe call 0xfeeb222e 17: 48 8b 0b mov (%rbx),%rcx 1a: 48 89 4c 24 18 mov %rcx,0x18(%rsp) 1f: 4e 8d 24 31 lea (%rcx,%r14,1),%r12 23: 4d 89 e5 mov %r12,%r13 26: 49 c1 ed 03 shr $0x3,%r13 * 2a: 43 80 7c 3d 00 00 cmpb $0x0,0x0(%r13,%r15,1) <-- trapping instruction 30: 74 08 je 0x3a 32: 4c 89 e7 mov %r12,%rdi 35: e8 f4 21 eb fe call 0xfeeb222e 3a: 4d 8b 3c 24 mov (%r12),%r15 3e: 4d rex.WRB 3f: 39 .byte 0x39 --- 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 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