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Message-ID: <CADUfDZqUS_gk=u+fx5QVp7+gNGTSt438YG+Z-FBZP8kougK3Fw@mail.gmail.com>
Date: Thu, 23 Oct 2025 14:34:00 -0700
From: Caleb Sander Mateos <csander@...estorage.com>
To: syzbot <syzbot+a77f64386b3e1b2ebb51@...kaller.appspotmail.com>
Cc: axboe@...nel.dk, io-uring@...r.kernel.org, kbusch@...nel.org,
linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [io-uring?] general protection fault in
io_uring_show_fdinfo (4)
On Thu, Oct 23, 2025 at 2:21 PM syzbot
<syzbot+a77f64386b3e1b2ebb51@...kaller.appspotmail.com> 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=11880c92580000
> kernel config: https://syzkaller.appspot.com/x/.config?x=c8b911aebadf6410
> dashboard link: https://syzkaller.appspot.com/bug?extid=a77f64386b3e1b2ebb51
> 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=12e73734580000
> C reproducer: https://syzkaller.appspot.com/x/repro.c?x=102f43e2580000
>
> Downloadable assets:
> disk image: https://storage.googleapis.com/syzbot-assets/44f7af9b7ca1/disk-aaa9c355.raw.xz
> vmlinux: https://storage.googleapis.com/syzbot-assets/9d09b0a9994d/vmlinux-aaa9c355.xz
> kernel image: https://storage.googleapis.com/syzbot-assets/ae729ccb2c5c/bzImage-aaa9c355.xz
>
> The issue was bisected to:
>
> commit 31dc41afdef21f264364288a30013b538c46152e
> Author: Keith Busch <kbusch@...nel.org>
> 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=12eac614580000
> final oops: https://syzkaller.appspot.com/x/report.txt?x=11eac614580000
> console output: https://syzkaller.appspot.com/x/log.txt?x=16eac614580000
>
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+a77f64386b3e1b2ebb51@...kaller.appspotmail.com
> Fixes: 31dc41afdef2 ("io_uring: add support for IORING_SETUP_SQE_MIXED")
>
> Oops: general protection fault, probably for non-canonical address 0xdffffc0000000000: 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 89 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:0000000000000000
> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 0000001b30363fff CR3: 0000000076c50000 CR4: 00000000003526f0
> Call Trace:
> <TASK>
> 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 ff 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
> </TASK>
> 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 89 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:0000000000000000
> 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 instruction
> 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@...glegroups.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
#syz dup: [syzbot] [io-uring?] general protection fault in
io_uring_show_fdinfo (3)
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