On Tue, Aug 13, 2024 at 6:14?AM syzbot <syzbot+2b946a3fd80caf971b21@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote: > > > On 8/13/24 2:50 AM, syzbot wrote: > >> Hello, > >> > >> syzbot found the following issue on: > >> > >> HEAD commit: 6a0e38264012 Merge tag 'for-6.11-rc2-tag' of git://git.ker.. > >> git tree: upstream > >> console output: https://syzkaller.appspot.com/x/log.txt?x=1019759d980000 > >> kernel config: https://syzkaller.appspot.com/x/.config?x=cb57e6ebf675f9d2 > >> dashboard link: https://syzkaller.appspot.com/bug?extid=2b946a3fd80caf971b21 > >> 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/753a842a966b/disk-6a0e3826.raw.xz > >> vmlinux: https://storage.googleapis.com/syzbot-assets/e12e23519777/vmlinux-6a0e3826.xz > >> kernel image: https://storage.googleapis.com/syzbot-assets/bce0584a8cb4/bzImage-6a0e3826.xz > >> > >> IMPORTANT: if you fix the issue, please add the following tag to the commit: > >> Reported-by: syzbot+2b946a3fd80caf971b21@xxxxxxxxxxxxxxxxxxxxxxxxx > >> > >> ================================================================== > >> BUG: KCSAN: data-race in io_sq_thread / io_sq_thread_park > >> > >> write to 0xffff888111459638 of 8 bytes by task 10761 on cpu 1: > >> io_sq_thread+0xdab/0xff0 io_uring/sqpoll.c:383 > >> ret_from_fork+0x4b/0x60 arch/x86/kernel/process.c:147 > >> ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 > >> > >> read to 0xffff888111459638 of 8 bytes by task 10329 on cpu 0: > >> io_sq_thread_park+0x1b/0x80 io_uring/sqpoll.c:47 > >> io_ring_exit_work+0x197/0x500 io_uring/io_uring.c:2786 > >> process_one_work kernel/workqueue.c:3231 [inline] > >> process_scheduled_works+0x483/0x9a0 kernel/workqueue.c:3312 > >> worker_thread+0x526/0x700 kernel/workqueue.c:3390 > >> kthread+0x1d1/0x210 kernel/kthread.c:389 > >> ret_from_fork+0x4b/0x60 arch/x86/kernel/process.c:147 > >> ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 > >> > >> value changed: 0xffff8881223d0000 -> 0x0000000000000000 > > > > It's just a debug check. > > > > #syz test > > This crash does not have a reproducer. I cannot test it. #syz fix: io_uring/sqpoll: annotate debug task == current with data_race() -- Jens Axboe
