#syz fix: mm/page_alloc: protect PCP lists with a spinlock #syz dup: BUG: sleeping function called from invalid context in relay_open_buf The version of the patch above in next-20220614 is buggy leading to the report below. The version in next-20220620 is fine. Not sure how to tell syz bot this… On 2022-06-18 15:15:20 [-0700], syzbot wrote: > Hello, > > syzbot found the following issue on: > > HEAD commit: 35d872b9ea5b Add linux-next specific files for 20220614 > git tree: linux-next > console output: https://syzkaller.appspot.com/x/log.txt?x=155b0d10080000 > kernel config: https://syzkaller.appspot.com/x/.config?x=d7bf2236c6bb2403 > dashboard link: https://syzkaller.appspot.com/bug?extid=b577bc624afda52c78de > compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2 > > Unfortunately, I don't have any reproducer for this issue yet. > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > Reported-by: syzbot+b577bc624afda52c78de@xxxxxxxxxxxxxxxxxxxxxxxxx > > BUG: sleeping function called from invalid context at mm/vmalloc.c:2980 … > Preemption disabled at: > [<ffffffff81bc76f5>] rmqueue_pcplist mm/page_alloc.c:3813 [inline] > [<ffffffff81bc76f5>] rmqueue mm/page_alloc.c:3858 [inline] > [<ffffffff81bc76f5>] get_page_from_freelist+0x455/0x3a20 mm/page_alloc.c:4293 Sebastian
