On 8/28/23 5:42 PM, Gabriel Krisman Bertazi wrote: > syzbot <syzbot+c74fea926a78b8a91042@xxxxxxxxxxxxxxxxxxxxxxxxx> writes: > >> Hello, >> >> syzbot found the following issue on: >> >> HEAD commit: 626932085009 Add linux-next specific files for 20230825 >> git tree: linux-next >> console output: https://syzkaller.appspot.com/x/log.txt?x=12a97797a80000 >> kernel config: https://syzkaller.appspot.com/x/.config?x=8a8c992a790e5073 >> dashboard link: https://syzkaller.appspot.com/bug?extid=c74fea926a78b8a91042 >> compiler: gcc (Debian 12.2.0-14) 12.2.0, 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/46ec18b3c2fb/disk-62693208.raw.xz >> vmlinux: https://storage.googleapis.com/syzbot-assets/b4ea0cb78498/vmlinux-62693208.xz >> kernel image: https://storage.googleapis.com/syzbot-assets/5fb3938c7272/bzImage-62693208.xz >> >> IMPORTANT: if you fix the issue, please add the following tag to the commit: >> Reported-by: syzbot+c74fea926a78b8a91042@xxxxxxxxxxxxxxxxxxxxxxxxx >> >> general protection fault, probably for non-canonical address 0xdffffc000000011d: 0000 [#1] PREEMPT SMP KASAN >> KASAN: null-ptr-deref in range [0x00000000000008e8-0x00000000000008ef] >> CPU: 1 PID: 27342 Comm: syz-executor.5 Not tainted 6.5.0-rc7-next-20230825-syzkaller #0 >> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/26/2023 >> RIP: 0010:io_sqpoll_wq_cpu_affinity+0x8c/0xe0 io_uring/sqpoll.c:433 > > Jens, > > I'm not sure I got the whole story on this one, but it seems fairly > trivial to reproduce and I can't see another way it could be > triggered. What do you think? Yep looks like the right fix, we should check the thread after parking. I'll get this added to the queue, thanks. -- Jens Axboe
