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Message-ID: <68fa9c5e.a70a0220.3bf6c6.00c9.GAE@google.com>
Date: Thu, 23 Oct 2025 14:21:34 -0700
From: syzbot <syzbot+a77f64386b3e1b2ebb51@...kaller.appspotmail.com>
To: axboe@...nel.dk, io-uring@...r.kernel.org, kbusch@...nel.org,
linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com
Subject: [syzbot] [io-uring?] general protection fault in io_uring_show_fdinfo (4)
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
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