From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-io1-f79.google.com (mail-io1-f79.google.com [209.85.166.79]) (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 D0A5221D011 for ; Thu, 23 Oct 2025 21:34:13 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.166.79 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1761255255; cv=none; b=f4NapX9PIkt1O2K4zuBGAMRX1kkOCF4YtwV+8iJwZwGNY0IbpeDFLr94ncP3BjjPeSnFRFhirV6fVP1UDH2tbamhejV3wF/3OWisbQIo8rycz3bZCBiK89RmPGp6rIIz73wqdlLrdGcRSFLbEGpLrBbMGWN+xTftJ3Ahd/R+J4Q= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1761255255; c=relaxed/simple; bh=b9mJ0wfHCdFAxMXdIFdF1OEj7j462EBU3I7Rxg8e0nU=; h=MIME-Version:Date:In-Reply-To:Message-ID:Subject:From:To:Cc: Content-Type; b=JM9sqrHjZhtu305nN5s7yv44hfO0f1CGo3NBQse3I/URsBQrpWnWqLgr4u8ig3nuM4QyzYU5uY8ka6zeJvD0N+I30TgH1hHhBZJ9yUqWgl5YWXPwxbshCVS3nfsUNEt9Thgtj+0VYQYDKISHCdqGd+awlu6b4fhVMdfQ6wx5nVI= 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=209.85.166.79 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-io1-f79.google.com with SMTP id ca18e2360f4ac-93e809242d0so349746539f.0 for ; Thu, 23 Oct 2025 14:34:13 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1761255253; x=1761860053; h=content-transfer-encoding:cc:to:from:subject:message-id:in-reply-to :date:mime-version:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to; bh=loe8th7Xg9hRopVA0WvfRwtb93WZHAknxHHhI585kIM=; b=f3rjZEkTDtZT0Y6VaAu7X6N79Uamyzx0bQadX6TiZEh+Hw2yYEctpKKqC6gB4V+vob HzyWNMjeMny/5w0PeaX/wwyqrGs60Nlf7V67qY8eM0o78CNBusFCmJcEVazV0FggjSQF UbIoPxTPRyHUAGEklNwXkjZktWYf7uRa1YmQK/ihIv+kxJK3u9Tz87L9DfbLxIXqDSTV uocLE0TxxxhIRoME46ELqePTQTHXY2ObWor4VBOewmvX2sYEBmUX+6BeonL4fzwEQW4D CdWdj/O9iK2fJI1hw0mM4qVwMe4YU3MQ3l2ZIaSQ1pIyZrzh9xW35/wo/ReNJnCTQKlH 2OOg== X-Forwarded-Encrypted: i=1; AJvYcCUJh46uqw1clfzrjH50rWJCJitbNG+Syl/YUVLsrsizOm+koaNrmc71JjchpaMW9ZYQtigCZtzhSg==@vger.kernel.org X-Gm-Message-State: AOJu0YxfWn9NCFEFYQOeTW/Y95N2xuQnAmQJwje1/sgS/nUq9nW+yM/f WQPLpJzhLghkHO3HddiVpwHGqFmbzt5eFSvAD4JXyIIAvaZuM/bEuiMdUvjthjEIqUsLpk7MVHe 1LnuOIhgb/sVDmb7QG8dP+Lus6RetXcG7fwvNyGlkpKBKpNhsttSYiBkwJpM= X-Google-Smtp-Source: AGHT+IH75gHK6dAsXoGW8erErOQGTqLjf8vOAntJk6lzGTmhBleUeT2KX6rneyVPyH5+/Yvbs6I+46DO7YFT74TCH0t4qkC7RUNv Precedence: bulk X-Mailing-List: io-uring@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6e02:3287:b0:430:a3b0:8458 with SMTP id e9e14a558f8ab-431dc139f2cmr67391585ab.3.1761255253090; Thu, 23 Oct 2025 14:34:13 -0700 (PDT) Date: Thu, 23 Oct 2025 14:34:13 -0700 In-Reply-To: X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <68fa9f55.a70a0220.3bf6c6.00cc.GAE@google.com> Subject: Re: [syzbot] [io-uring?] general protection fault in io_uring_show_fdinfo (4) From: syzbot To: csander@purestorage.com Cc: axboe@kernel.dk, csander@purestorage.com, io-uring@vger.kernel.org, kbusch@kernel.org, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable > On Thu, Oct 23, 2025 at 2:21=E2=80=AFPM syzbot > wrote: >> >> Hello, >> >> syzbot found the following issue on: >> >> HEAD commit: aaa9c3550b60 Add linux-next specific files for 20251022 >> git tree: linux-next >> console output: https://syzkaller.appspot.com/x/log.txt?x=3D11880c925800= 00 >> kernel config: https://syzkaller.appspot.com/x/.config?x=3Dc8b911aebadf= 6410 >> dashboard link: https://syzkaller.appspot.com/bug?extid=3Da77f64386b3e1b= 2ebb51 >> compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b79= 76-1~exp1~20250708183702.136), Debian LLD 20.1.8 >> syz repro: https://syzkaller.appspot.com/x/repro.syz?x=3D12e7373458= 0000 >> C reproducer: https://syzkaller.appspot.com/x/repro.c?x=3D102f43e25800= 00 >> >> Downloadable assets: >> disk image: https://storage.googleapis.com/syzbot-assets/44f7af9b7ca1/di= sk-aaa9c355.raw.xz >> vmlinux: https://storage.googleapis.com/syzbot-assets/9d09b0a9994d/vmlin= ux-aaa9c355.xz >> kernel image: https://storage.googleapis.com/syzbot-assets/ae729ccb2c5c/= bzImage-aaa9c355.xz >> >> The issue was bisected to: >> >> commit 31dc41afdef21f264364288a30013b538c46152e >> Author: Keith Busch >> Date: Thu Oct 16 18:09:38 2025 +0000 >> >> io_uring: add support for IORING_SETUP_SQE_MIXED >> >> bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=3D12eac6145= 80000 >> final oops: https://syzkaller.appspot.com/x/report.txt?x=3D11eac6145= 80000 >> console output: https://syzkaller.appspot.com/x/log.txt?x=3D16eac6145800= 00 >> >> IMPORTANT: if you fix the issue, please add the following tag to the com= mit: >> Reported-by: syzbot+a77f64386b3e1b2ebb51@syzkaller.appspotmail.com >> Fixes: 31dc41afdef2 ("io_uring: add support for IORING_SETUP_SQE_MIXED") >> >> Oops: general protection fault, probably for non-canonical address 0xdff= ffc0000000000: 0000 [#1] SMP KASAN PTI >> KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] >> CPU: 0 UID: 0 PID: 6032 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(= full) >> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS = Google 10/02/2025 >> RIP: 0010:__io_uring_show_fdinfo io_uring/fdinfo.c:103 [inline] >> RIP: 0010:io_uring_show_fdinfo+0x371/0x1840 io_uring/fdinfo.c:255 >> Code: 0f 85 29 04 00 00 45 8b 36 44 89 f7 44 89 ee e8 a5 ec 94 00 45 39 = ee 76 11 e8 db ea 94 00 45 89 fd 4c 8b 3c 24 e9 c9 03 00 00 <80> 3b 00 45 8= 9 fd 0f 85 17 04 00 00 0f b6 2c 25 00 00 00 00 48 8b >> RSP: 0018:ffffc9000392f928 EFLAGS: 00010293 >> RAX: ffffffff812b42ab RBX: dffffc0000000000 RCX: 0000000000000000 >> RDX: ffff888026c65ac0 RSI: 00000000000001ff RDI: 0000000000000000 >> RBP: 0000000000000000 R08: ffff888069c000aa R09: 1ffff1100d380015 >> R10: dffffc0000000000 R11: ffffed100d380016 R12: 0000000000000008 >> R13: 00000000000001ff R14: 0000000000000000 R15: 0000000000000000 >> FS: 000055556a027500(0000) GS:ffff888125f29000(0000) knlGS:000000000000= 0000 >> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 >> CR2: 0000001b30363fff CR3: 0000000076c50000 CR4: 00000000003526f0 >> Call Trace: >> >> seq_show+0x5bc/0x730 fs/proc/fd.c:68 >> seq_read_iter+0x4ef/0xe20 fs/seq_file.c:230 >> seq_read+0x369/0x480 fs/seq_file.c:162 >> vfs_read+0x200/0xa30 fs/read_write.c:570 >> ksys_read+0x145/0x250 fs/read_write.c:715 >> do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] >> do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94 >> entry_SYSCALL_64_after_hwframe+0x77/0x7f >> RIP: 0033:0x7f198c78efc9 >> Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 f= f ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 >> RSP: 002b:00007fffae1a3128 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 >> RAX: ffffffffffffffda RBX: 00007f198c9e5fa0 RCX: 00007f198c78efc9 >> RDX: 0000000000002020 RSI: 00002000000040c0 RDI: 0000000000000004 >> RBP: 00007f198c811f91 R08: 0000000000000000 R09: 0000000000000000 >> R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 >> R13: 00007f198c9e5fa0 R14: 00007f198c9e5fa0 R15: 0000000000000003 >> >> Modules linked in: >> ---[ end trace 0000000000000000 ]--- >> RIP: 0010:__io_uring_show_fdinfo io_uring/fdinfo.c:103 [inline] >> RIP: 0010:io_uring_show_fdinfo+0x371/0x1840 io_uring/fdinfo.c:255 >> Code: 0f 85 29 04 00 00 45 8b 36 44 89 f7 44 89 ee e8 a5 ec 94 00 45 39 = ee 76 11 e8 db ea 94 00 45 89 fd 4c 8b 3c 24 e9 c9 03 00 00 <80> 3b 00 45 8= 9 fd 0f 85 17 04 00 00 0f b6 2c 25 00 00 00 00 48 8b >> RSP: 0018:ffffc9000392f928 EFLAGS: 00010293 >> RAX: ffffffff812b42ab RBX: dffffc0000000000 RCX: 0000000000000000 >> RDX: ffff888026c65ac0 RSI: 00000000000001ff RDI: 0000000000000000 >> RBP: 0000000000000000 R08: ffff888069c000aa R09: 1ffff1100d380015 >> R10: dffffc0000000000 R11: ffffed100d380016 R12: 0000000000000008 >> R13: 00000000000001ff R14: 0000000000000000 R15: 0000000000000000 >> FS: 000055556a027500(0000) GS:ffff888125f29000(0000) knlGS:000000000000= 0000 >> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 >> CR2: 0000001b30363fff CR3: 0000000076c50000 CR4: 00000000003526f0 >> ---------------- >> Code disassembly (best guess): >> 0: 0f 85 29 04 00 00 jne 0x42f >> 6: 45 8b 36 mov (%r14),%r14d >> 9: 44 89 f7 mov %r14d,%edi >> c: 44 89 ee mov %r13d,%esi >> f: e8 a5 ec 94 00 call 0x94ecb9 >> 14: 45 39 ee cmp %r13d,%r14d >> 17: 76 11 jbe 0x2a >> 19: e8 db ea 94 00 call 0x94eaf9 >> 1e: 45 89 fd mov %r15d,%r13d >> 21: 4c 8b 3c 24 mov (%rsp),%r15 >> 25: e9 c9 03 00 00 jmp 0x3f3 >> * 2a: 80 3b 00 cmpb $0x0,(%rbx) <-- trapping instruct= ion >> 2d: 45 89 fd mov %r15d,%r13d >> 30: 0f 85 17 04 00 00 jne 0x44d >> 36: 0f b6 2c 25 00 00 00 movzbl 0x0,%ebp >> 3d: 00 >> 3e: 48 rex.W >> 3f: 8b .byte 0x8b >> >> >> --- >> 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#bisec= tion >> >> 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 > > #syz dup: [syzbot] [io-uring?] general protection fault in can't find the dup bug > io_uring_show_fdinfo (3)