Re: [syzbot] kernel BUG in remove_inode_hugepages

[Mike Kravetz]

On 8/16/21 7:07 PM, syzbot wrote:
> Hello,
> 
> syzbot found the following issue on:
> 
> HEAD commit:    a2824f19e606 Merge tag 'mtd/fixes-for-5.14-rc7' of git://g..
> git tree:       upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=110d54ee300000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=96f0602203250753
> dashboard link: https://syzkaller.appspot.com/bug?extid=67654e51e54455f1c585
> compiler:       gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.1
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=12eeb6a6300000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=13515779300000
> 
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+67654e51e54455f1c585@xxxxxxxxxxxxxxxxxxxxxxxxx
> 
> Code: 28 c3 e8 2a 14 00 00 66 2e 0f 1f 84 00 00 00 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 c0 ff ff ff f7 d8 64 89 01 48
> RSP: 002b:00007ffedef26928 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
> RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 000000000043f589
> RDX: 000000000000effd RSI: 0000000020000680 RDI: 0000000000000003
> RBP: 00007ffedef26930 R08: 0000000000000001 R09: 0000000000400034
> R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000005
> R13: 0000000000000000 R14: 00000000004ad018 R15: 0000000000400488
> ------------[ cut here ]------------
> kernel BUG at fs/hugetlbfs/inode.c:532!

Let's me see if I can get syzbot to test it:

#syz test: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git a2824f19e6065a0d3735acd9fe7155b104e7edf5