On 7/1/24 21:50, syzbot wrote:
Hello, syzbot found the following issue on: HEAD commit: 74564adfd352 Add linux-next specific files for 20240701 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=135c21d1980000 kernel config: https://syzkaller.appspot.com/x/.config?x=111e4e0e6fbde8f0 dashboard link: https://syzkaller.appspot.com/bug?extid=f7f9c893345c5c615d34 compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/04b8d7db78fb/disk-74564adf.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/d996f4370003/vmlinux-74564adf.xz kernel image: https://storage.googleapis.com/syzbot-assets/6e7e630054e7/bzImage-74564adf.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+f7f9c893345c5c615d34@xxxxxxxxxxxxxxxxxxxxxxxxx ------------[ cut here ]------------ WARNING: CPU: 0 PID: 5145 at io_uring/io_uring.c:703 io_cqring_event_overflow+0x442/0x660 io_uring/io_uring.c:703
Makes sense, it needs locking around overflowing, will fix it
Modules linked in: CPU: 0 UID: 0 PID: 5145 Comm: kworker/0:4 Not tainted 6.10.0-rc6-next-20240701-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024 Workqueue: events io_fallback_req_func RIP: 0010:io_cqring_event_overflow+0x442/0x660 io_uring/io_uring.c:703 Code: 0f 95 c0 48 83 c4 20 5b 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc e8 ed ae ed fc 90 0f 0b 90 e9 c5 fc ff ff e8 df ae ed fc 90 <0f> 0b 90 e9 6e fc ff ff e8 d1 ae ed fc c6 05 f6 ea f3 0a 01 90 48 RSP: 0018:ffffc900040d7a08 EFLAGS: 00010293 RAX: ffffffff84a5cf11 RBX: 0000000000000000 RCX: ffff8880299bbc00 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: ffffffff84a5cb74 R09: 0000000000000000 R10: dffffc0000000000 R11: ffffffff84a9f5d0 R12: ffff888021d0a000 R13: 0000000000000000 R14: ffff888021d0a000 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8880b9400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f4e669ff800 CR3: 000000002a360000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> __io_post_aux_cqe io_uring/io_uring.c:816 [inline] io_add_aux_cqe+0x27c/0x320 io_uring/io_uring.c:837 io_msg_tw_complete+0x9d/0x4d0 io_uring/msg_ring.c:78 io_fallback_req_func+0xce/0x1c0 io_uring/io_uring.c:256 process_one_work kernel/workqueue.c:3224 [inline] process_scheduled_works+0xa2c/0x1830 kernel/workqueue.c:3305 worker_thread+0x86d/0xd40 kernel/workqueue.c:3383 kthread+0x2f0/0x390 kernel/kthread.c:389 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:144 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 </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. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title 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
-- Pavel Begunkov
