Date:   Mon, 10 Apr 2023 17:07:13 +0800
From:   Gao Xiang <hsiangkao@...ux.alibaba.com>
To:     syzbot <syzbot+c679d2fb47506ba04298@...kaller.appspotmail.com>,
        linux-erofs@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
        syzkaller-bugs@...glegroups.com, xiang@...nel.org
Subject: Re: [syzbot] [erofs?] WARNING in z_erofs_decompress_queue



On 2023/1/30 16:18, syzbot wrote:
> Hello,
> 
> syzbot found the following issue on:
> 
> HEAD commit:    7c46948a6e9c Merge tag 'fs.fuse.acl.v6.2-rc6' of git://git..
> git tree:       upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=1360d6c1480000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=c8d5c2ee6c2bd4b8
> dashboard link: https://syzkaller.appspot.com/bug?extid=c679d2fb47506ba04298
> compiler:       Debian clang version 13.0.1-6~deb11u1, GNU ld (GNU Binutils for Debian) 2.35.2
> 
> Unfortunately, I don't have any reproducer for this issue yet.
> 
> Downloadable assets:
> disk image: https://storage.googleapis.com/syzbot-assets/cc51645b6401/disk-7c46948a.raw.xz
> vmlinux: https://storage.googleapis.com/syzbot-assets/be036b5604a3/vmlinux-7c46948a.xz
> kernel image: https://storage.googleapis.com/syzbot-assets/274f5abf2c8f/bzImage-7c46948a.xz
> 
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+c679d2fb47506ba04298@...kaller.appspotmail.com
> 

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

> ------------[ cut here ]------------
> WARNING: CPU: 1 PID: 11026 at mm/page_alloc.c:5525 __alloc_pages+0x30a/0x560 mm/page_alloc.c:5525
> Modules linked in:
> CPU: 1 PID: 11026 Comm: syz-executor.2 Not tainted 6.2.0-rc5-syzkaller-00047-g7c46948a6e9c #0
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/12/2023
> RIP: 0010:__alloc_pages+0x30a/0x560 mm/page_alloc.c:5525
> Code: 5c 24 04 0f 85 f3 00 00 00 44 89 e1 81 e1 7f ff ff ff a9 00 00 04 00 41 0f 44 cc 41 89 cc e9 e3 00 00 00 c6 05 30 8a ad 0c 01 <0f> 0b 83 fb 0a 0f 86 c8 fd ff ff 31 db 48 c7 44 24 20 0e 36 e0 45
> RSP: 0018:ffffc9000552db20 EFLAGS: 00010246
> RAX: ffffc9000552db80 RBX: 000000000000000b RCX: 0000000000000000
> RDX: 0000000000000028 RSI: 0000000000000000 RDI: ffffc9000552dba8
> RBP: ffffc9000552dc38 R08: dffffc0000000000 R09: ffffc9000552db80
> R10: fffff52000aa5b75 R11: 1ffff92000aa5b70 R12: 0000000000048dc0
> R13: 1ffff92000aa5b6c R14: dffffc0000000000 R15: 1ffff92000aa5b68
> FS:  00007f3ea5dfe700(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
> CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 000055555612f888 CR3: 000000001d1c2000 CR4: 00000000003506e0
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> Call Trace:
>   <TASK>
>   __alloc_pages_node include/linux/gfp.h:237 [inline]
>   alloc_pages_node include/linux/gfp.h:260 [inline]
>   __kmalloc_large_node+0x95/0x1e0 mm/slab_common.c:1113
>   __do_kmalloc_node mm/slab_common.c:956 [inline]
>   __kmalloc+0xfe/0x190 mm/slab_common.c:981
>   kmalloc_array include/linux/slab.h:636 [inline]
>   kcalloc include/linux/slab.h:667 [inline]
>   z_erofs_decompress_pcluster fs/erofs/zdata.c:1035 [inline]
>   z_erofs_decompress_queue+0x68e/0x2c20 fs/erofs/zdata.c:1141
>   z_erofs_decompressqueue_work fs/erofs/zdata.c:1153 [inline]
>   z_erofs_decompress_kickoff+0x24c/0x2f0 fs/erofs/zdata.c:1181
>   z_erofs_submit_queue+0xe8e/0x1050 fs/erofs/zdata.c:1509
>   z_erofs_runqueue fs/erofs/zdata.c:1519 [inline]
>   z_erofs_readahead+0x70b/0x910 fs/erofs/zdata.c:1666
>   read_pages+0x169/0x9c0 mm/readahead.c:161
>   page_cache_ra_unbounded+0x703/0x820 mm/readahead.c:270
>   page_cache_sync_readahead include/linux/pagemap.h:1210 [inline]
>   filemap_get_pages+0x465/0x10d0 mm/filemap.c:2600
>   filemap_read+0x3cf/0xea0 mm/filemap.c:2694
>   __kernel_read+0x3fc/0x830 fs/read_write.c:428
>   integrity_kernel_read+0xac/0xf0 security/integrity/iint.c:199
>   ima_calc_file_hash_tfm security/integrity/ima/ima_crypto.c:485 [inline]
>   ima_calc_file_shash security/integrity/ima/ima_crypto.c:516 [inline]
>   ima_calc_file_hash+0x178f/0x1ca0 security/integrity/ima/ima_crypto.c:573
>   ima_collect_measurement+0x444/0x8c0 security/integrity/ima/ima_api.c:292
>   process_measurement+0xf41/0x1bc0 security/integrity/ima/ima_main.c:339
>   ima_file_check+0xd8/0x130 security/integrity/ima/ima_main.c:519
>   do_open fs/namei.c:3559 [inline]
>   path_openat+0x2600/0x2dd0 fs/namei.c:3714
>   do_filp_open+0x264/0x4f0 fs/namei.c:3741
>   do_sys_openat2+0x124/0x4e0 fs/open.c:1310
>   do_sys_open fs/open.c:1326 [inline]
>   __do_sys_open fs/open.c:1334 [inline]
>   __se_sys_open fs/open.c:1330 [inline]
>   __x64_sys_open+0x221/0x270 fs/open.c:1330
>   do_syscall_x64 arch/x86/entry/common.c:50 [inline]
>   do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
>   entry_SYSCALL_64_after_hwframe+0x63/0xcd
> RIP: 0033:0x7f3ea728c0c9
> Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 00 00 90 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 b8 ff ff ff f7 d8 64 89 01 48
> RSP: 002b:00007f3ea5dfe168 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
> RAX: ffffffffffffffda RBX: 00007f3ea73abf80 RCX: 00007f3ea728c0c9
> RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000040
> RBP: 00007f3ea72e7ae9 R08: 0000000000000000 R09: 0000000000000000
> R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
> R13: 00007ffd3dfcbf0f R14: 00007f3ea5dfe300 R15: 0000000000022000
>   </TASK>
> 
> 
> ---
> This report is generated by a bot. It may contain errors.
> See https://goo.gl/tpsmEJ for more information about syzbot.
> syzbot engineers can be reached at syzkaller@...glegroups.com.
> 
> syzbot will keep track of this issue. See:
> https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
> 

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