[syzbot] [ext4?] [jffs2?] [xfs?] kernel BUG in unrefer_xattr_datum

syzbot
2024-04-09T04:04:35Z

Hello,

syzbot found the following issue on:

HEAD commit: 707081b61156 Merge branch 'for-next/core', remote-tracking..
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=1562c52d180000
kernel config: https://syzkaller.appspot.com/x/.config?x=caeac3f3565b057a
dashboard link: https://syzkaller.appspot.com/bug?extid=b417f0468b73945887f0
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
userspace arch: arm64
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=14e74805180000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1613cca9180000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/6cad68bf7532/disk-707081b6.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/1a27e5400778/vmlinux-707081b6.xz
kernel image: https://storage.googleapis.com/syzbot-assets/67dfc53755d0/Image-707081b6.gz.xz
mounted in repro #1: https://storage.googleapis.com/syzbot-assets/f039597bec42/mount_0.gz
mounted in repro #2: https://storage.googleapis.com/syzbot-assets/b3fe5cff7c96/mount_4.gz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+b417f0468b73945887f0@syzkaller.appspotmail.com

jffs2: nextblock 0x0001d000, expected at 0001f000
jffs2: argh. node added in wrong place at 0x0001e03c(2)
jffs2: nextblock 0x0001d000, expected at 0001f000
------------[ cut here ]------------
kernel BUG at fs/jffs2/xattr.c:411!
Internal error: Oops - BUG: 00000000f2000800 [#1] PREEMPT SMP
Modules linked in:
CPU: 0 PID: 6173 Comm: syz-executor110 Not tainted 6.8.0-rc7-syzkaller-g707081b61156 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : unrefer_xattr_datum+0x3a8/0x3ac fs/jffs2/xattr.c:411
lr : unrefer_xattr_datum+0x3a8/0x3ac fs/jffs2/xattr.c:411
sp : ffff8000978575f0
x29: ffff800097857600 x28: 1fffe0001aaffe23 x27: 1fffe0001aaffe28
x26: dfff800000000000 x25: 1fffe0001aaffe24 x24: ffff0000d57ff120
x23: 0000000000000001 x22: ffff0000d57ff118 x21: ffff0000d7d3a000
x20: ffff0000d57ff100 x19: ffff0000d7d3a638 x18: 1fffe000367fff96
x17: ffff80008ec9d000 x16: ffff80008032116c x15: 0000000000000001
x14: 1ffff00011ea7bfa x13: 0000000000000000 x12: 0000000000000003
x11: 0000000000000001 x10: 0000000000ff0100 x9 : 0000000000000000
x8 : ffff0000d5131e00 x7 : ffff80008005fa20 x6 : ffff80008005fc1c
x5 : ffff0000d6092c08 x4 : ffff800097857368 x3 : 0000000000000000
x2 : ffff0000d57ff118 x1 : 0000000000000001 x0 : 00000000000000ff
Call trace:
unrefer_xattr_datum+0x3a8/0x3ac fs/jffs2/xattr.c:411
do_jffs2_setxattr+0xde0/0x1158
jffs2_trusted_setxattr+0x4c/0x64 fs/jffs2/xattr_trusted.c:33
__vfs_setxattr+0x3d8/0x400 fs/xattr.c:201
__vfs_setxattr_noperm+0x110/0x528 fs/xattr.c:235
__vfs_setxattr_locked+0x1ec/0x218 fs/xattr.c:296
vfs_setxattr+0x1a8/0x344 fs/xattr.c:322
do_setxattr fs/xattr.c:630 [inline]
setxattr+0x208/0x29c fs/xattr.c:653
path_setxattr+0x17c/0x258 fs/xattr.c:672
__do_sys_lsetxattr fs/xattr.c:695 [inline]
__se_sys_lsetxattr fs/xattr.c:691 [inline]
__arm64_sys_lsetxattr+0xbc/0xd8 fs/xattr.c:691
__invoke_syscall arch/arm64/kernel/syscall.c:34 [inline]
invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:48
el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:133
do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:152
el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:712
el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:730
el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:598
Code: aa1803e0 97c66b4c 17ffff47 97b31b25 (d4210000)
---[ end trace 0000000000000000 ]---

---
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@googlegroups.com.

syzbot will keep track of this issue. See:
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If the report is already addressed, let syzbot know by replying with:
#syz fix: exact-commit-title

If you want syzbot to run the reproducer, reply with:
#syz test: git://repo/address.git branch-or-commit-hash
If you attach or paste a git patch, syzbot will apply it before testing.

If you want to overwrite report's subsystems, reply with:
#syz set subsystems: new-subsystem
(See the list of subsystem names on the web dashboard)

If the report is a duplicate of another one, reply with:
#syz dup: exact-subject-of-another-report

If you want to undo deduplication, reply with:
#syz undup

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