Re: [syzbot] WARNING in rmqueue

[Gao Xiang]

On 2022/11/29 16:43, syzbot wrote:
> Hello,
>
> syzbot found the following issue on:
>
> HEAD commit:    b7b275e60bcd Linux 6.1-rc7
> git tree:       upstream
> console+strace: https://syzkaller.appspot.com/x/log.txt?x=16a70187880000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=2325e409a9a893e1
> dashboard link: https://syzkaller.appspot.com/bug?extid=aafb3f37cfeb6534c4ac
> compiler:       Debian clang version 13.0.1-++20220126092033+75e33f71c2da-1~exp1~20220126212112.63, GNU ld (GNU Binutils for Debian) 2.35.2
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=15dde8a1880000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=15685e8d880000
>
> Downloadable assets:
> disk image: https://storage.googleapis.com/syzbot-assets/525233126d34/disk-b7b275e6.raw.xz
> vmlinux: https://storage.googleapis.com/syzbot-assets/e8299bf41400/vmlinux-b7b275e6.xz
> kernel image: https://storage.googleapis.com/syzbot-assets/eebf691dbf6f/bzImage-b7b275e6.xz
> mounted in repro: https://storage.googleapis.com/syzbot-assets/d643567f551d/mount_0.gz
>
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+aafb3f37cfeb6534c4ac@xxxxxxxxxxxxxxxxxxxxxxxxx

#syz test: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/ v6.3-rc6

> ------------[ cut here ]------------
> WARNING: CPU: 0 PID: 48 at mm/page_alloc.c:3837 __count_numa_events include/linux/vmstat.h:249 [inline]
> WARNING: CPU: 0 PID: 48 at mm/page_alloc.c:3837 zone_statistics mm/page_alloc.c:3692 [inline]
> WARNING: CPU: 0 PID: 48 at mm/page_alloc.c:3837 rmqueue_buddy mm/page_alloc.c:3728 [inline]
> WARNING: CPU: 0 PID: 48 at mm/page_alloc.c:3837 rmqueue+0x1d6b/0x1ed0 mm/page_alloc.c:3853
> Modules linked in:
> CPU: 0 PID: 48 Comm: kworker/u5:0 Not tainted 6.1.0-rc7-syzkaller #0
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
> Workqueue: erofs_unzipd z_erofs_decompressqueue_work
> RIP: 0010:rmqueue+0x1d6b/0x1ed0 mm/page_alloc.c:3837
> Code: 48 8b 02 65 48 ff 40 20 49 83 f6 05 42 80 3c 2b 00 74 08 4c 89 e7 e8 a4 44 0b 00 49 8b 04 24 65 4a ff 44 f0 10 e9 2a fe ff ff <0f> 0b e9 29 e3 ff ff 48 89 df be 08 00 00 00 e8 31 46 0b 00 f0 41
> RSP: 0018:ffffc90000b97260 EFLAGS: 00010202
> RAX: f301f204f1f1f1f1 RBX: ffff88813fffae00 RCX: 000000000000adc2
> RDX: 1ffff92000172e70 RSI: 1ffff92000172e70 RDI: ffff88813fffae00
> RBP: ffffc90000b97420 R08: 0000000000000901 R09: 0000000000000009
> R10: ffffed1027fff5b3 R11: 1ffff11027fff5b2 R12: ffff88813fffc310
> R13: dffffc0000000000 R14: 0000000000000000 R15: ffff88813fffa700
> FS:  0000000000000000(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
> CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 00007f7bec722f10 CR3: 000000004a430000 CR4: 00000000003506f0
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> Call Trace:
>   <TASK>
>   get_page_from_freelist+0x4b6/0x7c0 mm/page_alloc.c:4288
>   __alloc_pages+0x259/0x560 mm/page_alloc.c:5558
>   vm_area_alloc_pages mm/vmalloc.c:2975 [inline]
>   __vmalloc_area_node mm/vmalloc.c:3043 [inline]
>   __vmalloc_node_range+0x8f4/0x1290 mm/vmalloc.c:3213
>   kvmalloc_node+0x13e/0x180 mm/util.c:606
>   kvmalloc include/linux/slab.h:706 [inline]
>   kvmalloc_array include/linux/slab.h:724 [inline]
>   kvcalloc include/linux/slab.h:729 [inline]
>   z_erofs_decompress_pcluster fs/erofs/zdata.c:1049 [inline]
>   z_erofs_decompress_queue+0x693/0x2c30 fs/erofs/zdata.c:1155
>   z_erofs_decompressqueue_work+0x95/0xe0 fs/erofs/zdata.c:1167
>   process_one_work+0x877/0xdb0 kernel/workqueue.c:2289
>   worker_thread+0xb14/0x1330 kernel/workqueue.c:2436
>   kthread+0x266/0x300 kernel/kthread.c:376
>   ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306
>   </TASK>
>
>
> ---
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>
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