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io-uring@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a92:ca4d:0:b0:430:b05a:ecc3 with SMTP id e9e14a558f8ab-430c525f52amr164228225ab.9.1761255320927; Thu, 23 Oct 2025 14:35:20 -0700 (PDT) Date: Thu, 23 Oct 2025 14:35:20 -0700 In-Reply-To: X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <68fa9f98.050a0220.346f24.0083.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 2:34=E2=80=AFPM syzbot < > syzbot+a77f64386b3e1b2ebb51@syzkaller.appspotmail.com> wrote: >> >> > 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 202510= 22 >> >> git tree: linux-next >> >> console output: > https://syzkaller.appspot.com/x/log.txt?x=3D11880c92580000 >> >> kernel config: > https://syzkaller.appspot.com/x/.config?x=3Dc8b911aebadf6410 >> >> dashboard link: > https://syzkaller.appspot.com/bug?extid=3Da77f64386b3e1b2ebb51 >> >> 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=3D12e73734580000 >> >> C reproducer: > https://syzkaller.appspot.com/x/repro.c?x=3D102f43e2580000 >> >> >> >> Downloadable assets: >> >> disk image: > https://storage.googleapis.com/syzbot-assets/44f7af9b7ca1/disk-aaa9c355.r= aw.xz >> >> vmlinux: > https://storage.googleapis.com/syzbot-assets/9d09b0a9994d/vmlinux-aaa9c35= 5.xz >> >> kernel image: > https://storage.googleapis.com/syzbot-assets/ae729ccb2c5c/bzImage-aaa9c35= 5.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=3D12eac614580000 >> >> final oops: > https://syzkaller.appspot.com/x/report.txt?x=3D11eac614580000 >> >> console output: > https://syzkaller.appspot.com/x/log.txt?x=3D16eac614580000 >> >> >> >> 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: 000000000000000= 0 >> >> 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 >> > >> > #syz dup: [syzbot] [io-uring?] general protection fault in >> >> can't find the dup bug >> >> > io_uring_show_fdinfo (3) > > #syz dup: [syzbot] [io-uring?] general protection fault in can't find the dup bug > io_uring_show_fdinfo (3)