linux-kernel - [syzbot] [io-uring?] KCSAN: data-race in io_submit_sqes / io_uring

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Message-ID: <0000000000000925b0061b7687a2@google.com>
Date: Sat, 22 Jun 2024 01:42:25 -0700
From: syzbot <syzbot+6a4002279343ac44c448@...kaller.appspotmail.com>
To: asml.silence@...il.com, axboe@...nel.dk, io-uring@...r.kernel.org, 
	linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com
Subject: [syzbot] [io-uring?] KCSAN: data-race in io_submit_sqes /
 io_uring_poll (8)

Hello,

syzbot found the following issue on:

HEAD commit:    66cc544fd75c Merge tag 'dmaengine-fix-6.10' of git://git.k..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=128ed3da980000
kernel config:  https://syzkaller.appspot.com/x/.config?x=704451bc2941bcb0
dashboard link: https://syzkaller.appspot.com/bug?extid=6a4002279343ac44c448
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/4b6f7aacd04c/disk-66cc544f.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/083bb1b69afe/vmlinux-66cc544f.xz
kernel image: https://storage.googleapis.com/syzbot-assets/05a661578a53/bzImage-66cc544f.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+6a4002279343ac44c448@...kaller.appspotmail.com

==================================================================
BUG: KCSAN: data-race in io_submit_sqes / io_uring_poll

read-write to 0xffff888107b41870 of 4 bytes by task 4848 on cpu 1:
 io_get_sqe io_uring/io_uring.c:2276 [inline]
 io_submit_sqes+0x23f/0x1080 io_uring/io_uring.c:2327
 __do_sys_io_uring_enter io_uring/io_uring.c:3245 [inline]
 __se_sys_io_uring_enter+0x1c6/0x15a0 io_uring/io_uring.c:3182
 __x64_sys_io_uring_enter+0x78/0x90 io_uring/io_uring.c:3182
 x64_sys_call+0x25ab/0x2d70 arch/x86/include/generated/asm/syscalls_64.h:427
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xc9/0x1c0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff888107b41870 of 4 bytes by task 4847 on cpu 0:
 io_sqring_full io_uring/io_uring.h:285 [inline]
 io_uring_poll+0xcf/0x190 io_uring/io_uring.c:2739
 vfs_poll include/linux/poll.h:84 [inline]
 __io_arm_poll_handler+0x229/0xf30 io_uring/poll.c:622
 io_arm_poll_handler+0x411/0x5d0 io_uring/poll.c:756
 io_queue_async+0x89/0x320 io_uring/io_uring.c:1943
 io_queue_sqe io_uring/io_uring.c:1972 [inline]
 io_req_task_submit+0xb3/0xc0 io_uring/io_uring.c:1385
 io_handle_tw_list+0x1b9/0x200 io_uring/io_uring.c:1083
 tctx_task_work_run+0x6c/0x1b0 io_uring/io_uring.c:1155
 tctx_task_work+0x40/0x80 io_uring/io_uring.c:1173
 task_work_run+0x13a/0x1a0 kernel/task_work.c:180
 get_signal+0xeee/0x1080 kernel/signal.c:2681
 arch_do_signal_or_restart+0x95/0x4b0 arch/x86/kernel/signal.c:310
 exit_to_user_mode_loop kernel/entry/common.c:111 [inline]
 exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
 syscall_exit_to_user_mode+0x59/0x130 kernel/entry/common.c:218
 do_syscall_64+0xd6/0x1c0 arch/x86/entry/common.c:89
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x000003b7 -> 0x000003d5



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