Hello, syzbot found the following issue on: HEAD commit: 0bb80ecc33a8 Linux 6.6-rc1 git tree: upstream console+strace: https://syzkaller.appspot.com/x/log.txt?x=12d1eb78680000 kernel config: https://syzkaller.appspot.com/x/.config?x=f4894cf58531f dashboard link: https://syzkaller.appspot.com/bug?extid=a4c6e5ef999b68b26ed1 compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=16613002680000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=13912e30680000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/eeb0cac260c7/disk-0bb80ecc.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/a3c360110254/vmlinux-0bb80ecc.xz kernel image: https://storage.googleapis.com/syzbot-assets/22b81065ba5f/bzImage-0bb80ecc.xz The issue was bisected to: commit 2af89abda7d9c2aeb573677e2c498ddb09f8058a Author: Pavel Begunkov <asml.silence@xxxxxxxxx> Date: Thu Aug 24 22:53:32 2023 +0000 io_uring: add option to remove SQ indirection bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=15892e30680000 final oops: https://syzkaller.appspot.com/x/report.txt?x=17892e30680000 console output: https://syzkaller.appspot.com/x/log.txt?x=13892e30680000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+a4c6e5ef999b68b26ed1@xxxxxxxxxxxxxxxxxxxxxxxxx Fixes: 2af89abda7d9 ("io_uring: add option to remove SQ indirection") ================================================================================ UBSAN: array-index-out-of-bounds in io_uring/net.c:189:55 index 3779567444058 is out of range for type 'iovec [8]' CPU: 1 PID: 5039 Comm: syz-executor396 Not tainted 6.6.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/04/2023 Call Trace: <TASK> __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x125/0x1b0 lib/dump_stack.c:106 ubsan_epilogue lib/ubsan.c:217 [inline] __ubsan_handle_out_of_bounds+0x111/0x150 lib/ubsan.c:348 io_setup_async_msg+0x2a0/0x2b0 io_uring/net.c:189 io_recvmsg+0x169f/0x2170 io_uring/net.c:781 io_issue_sqe+0x54a/0xd80 io_uring/io_uring.c:1878 io_queue_sqe io_uring/io_uring.c:2063 [inline] io_submit_sqe io_uring/io_uring.c:2323 [inline] io_submit_sqes+0x96c/0x1ed0 io_uring/io_uring.c:2438 __do_sys_io_uring_enter+0x14ea/0x2650 io_uring/io_uring.c:3647 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x38/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f8af8d7c4e9 Code: 48 83 c4 28 c3 e8 37 17 00 00 0f 1f 80 00 00 00 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 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fff24b82fa8 EFLAGS: 00000246 ORIG_RAX: 00000000000001aa RAX: ffffffffffffffda RBX: 0000000000001592 RCX: 00007f8af8d7c4e9 RDX: 0000000000000000 RSI: 0000000000007689 RDI: 0000000000000003 RBP: 0000000000000003 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 00007fff24b83188 R14: 0000000000000001 R15: 0000000000000001 </TASK> ================================================================================ --- 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@xxxxxxxxxxxxxxxx. 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 bug is already fixed, 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 bug's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the bug is a duplicate of another bug, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup
