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List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6e02:3807:b0:430:c0cf:7920 with SMTP id e9e14a558f8ab-430c527bc73mr348783845ab.19.1761254494132; Thu, 23 Oct 2025 14:21:34 -0700 (PDT) Date: Thu, 23 Oct 2025 14:21:34 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <68fa9c5e.a70a0220.3bf6c6.00c9.GAE@google.com> Subject: [syzbot] [io-uring?] general protection fault in io_uring_show_fdinfo (4) From: syzbot To: axboe@kernel.dk, io-uring@vger.kernel.org, kbusch@kernel.org, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" 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 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@syzkaller.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: 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 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@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#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