linux-kernel - [syzbot] kernel BUG in f2fs_init_xattr

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Message-ID: <00000000000016b90805e769b1d2@google.com>
Date:   Mon, 29 Aug 2022 16:33:32 -0700
From:   syzbot <syzbot+81684812ea68216e08c5@...kaller.appspotmail.com>
To:     chao@...nel.org, jaegeuk@...nel.org,
        linux-f2fs-devel@...ts.sourceforge.net,
        linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com
Subject: [syzbot] kernel BUG in f2fs_init_xattr_caches

Hello,

syzbot found the following issue on:

HEAD commit:    a41a877bc12d Merge branch 'for-next/fixes' into for-kernelci
git tree:       git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci
console output: https://syzkaller.appspot.com/x/log.txt?x=13a4e48b080000
kernel config:  https://syzkaller.appspot.com/x/.config?x=5cea15779c42821c
dashboard link: https://syzkaller.appspot.com/bug?extid=81684812ea68216e08c5
compiler:       Debian clang version 13.0.1-++20220126092033+75e33f71c2da-1~exp1~20220126212112.63, GNU ld (GNU Binutils for Debian) 2.35.2
userspace arch: arm64
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=114f2fa3080000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=17cd7fa3080000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+81684812ea68216e08c5@...kaller.appspotmail.com

loop0: detected capacity change from 0 to 20
 loop0: unable to read partition table
loop0: partition table beyond EOD, truncated
F2FS-fs (loop0): Magic Mismatch, valid(0xf2f52010) - read(0x0)
F2FS-fs (loop0): Can't find valid F2FS filesystem in 1th superblock
------------[ cut here ]------------
kernel BUG at mm/slub.c:5893!
Internal error: Oops - BUG: 0 [#1] PREEMPT SMP
Modules linked in:
CPU: 1 PID: 3038 Comm: syz-executor368 Not tainted 6.0.0-rc2-syzkaller-16455-ga41a877bc12d #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022
pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : create_unique_id mm/slub.c:5973 [inline]
pc : sysfs_slab_add+0x258/0x260 mm/slub.c:5950
lr : kmalloc include/linux/slab.h:600 [inline]
lr : create_unique_id mm/slub.c:5890 [inline]
lr : sysfs_slab_add+0xa0/0x260 mm/slub.c:5950
sp : ffff80001288b990
x29: ffff80001288b990 x28: ffff0000c9717380 x27: ffff0000c376cd00
x26: 0000000000020000 x25: ffff80000eee7000 x24: ffff80000eef6000
x23: 0000000000000000 x22: ffff0000c1be5b00 x21: 0000000000000008
x20: ffff0000c376cd00 x19: ffff0000c376cd00 x18: 0000000000000000
x17: 0000000000000000 x16: ffff80000dbb8658 x15: ffff0000c6ae4f80
x14: 0000000000000010 x13: 0000000000000000 x12: ffff0000c6ae4f80
x11: ff808000095ee038 x10: 0000000000000000 x9 : 0cbee7d022858900
x8 : 0cbee7d022858900 x7 : ffff8000084b7280 x6 : 0000000000000000
x5 : 0000000000000cc0 x4 : 0000000000000080 x3 : 0000000000000040
x2 : ffff0000c0001200 x1 : ffff80000cb90cf9 x0 : 0000000000000000
Call trace:
 sysfs_slab_add+0x258/0x260 mm/slub.c:5973
 __kmem_cache_create+0x60/0x118 mm/slub.c:4899
 create_cache mm/slab_common.c:229 [inline]
 kmem_cache_create_usercopy+0x19c/0x31c mm/slab_common.c:335
 kmem_cache_create+0x1c/0x28 mm/slab_common.c:390
 f2fs_kmem_cache_create fs/f2fs/f2fs.h:2766 [inline]
 f2fs_init_xattr_caches+0x78/0xb4 fs/f2fs/xattr.c:808
 f2fs_fill_super+0x1050/0x1e0c fs/f2fs/super.c:4149
 mount_bdev+0x1b8/0x210 fs/super.c:1400
 f2fs_mount+0x44/0x58 fs/f2fs/super.c:4512
 legacy_get_tree+0x30/0x74 fs/fs_context.c:610
 vfs_get_tree+0x40/0x140 fs/super.c:1530
 do_new_mount+0x1dc/0x4e4 fs/namespace.c:3040
 path_mount+0x358/0x914 fs/namespace.c:3370
 do_mount fs/namespace.c:3383 [inline]
 __do_sys_mount fs/namespace.c:3591 [inline]
 __se_sys_mount fs/namespace.c:3568 [inline]
 __arm64_sys_mount+0x2f8/0x408 fs/namespace.c:3568
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall arch/arm64/kernel/syscall.c:52 [inline]
 el0_svc_common+0x138/0x220 arch/arm64/kernel/syscall.c:142
 do_el0_svc+0x48/0x154 arch/arm64/kernel/syscall.c:206
 el0_svc+0x58/0x150 arch/arm64/kernel/entry-common.c:624
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:642
 el0t_64_sync+0x18c/0x190
Code: a9415ff8 a8c47bfd d50323bf d65f03c0 (d4210000) 
---[ end trace 0000000000000000 ]---


---
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