[syzbot] [jffs2?] kernel BUG in jffs2_sum_write_sumnode

From: syzbot
Date: Fri Apr 12 2024 - 05:06:21 EST

Hello,

syzbot found the following issue on:

HEAD commit: 00dcf5d862e8 Merge tag 'acpi-6.9-rc4' of git://git.kernel...
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=11a98eeb180000
kernel config: https://syzkaller.appspot.com/x/.config?x=c5a8421528fe0176
dashboard link: https://syzkaller.appspot.com/bug?extid=badbb16b0a5dd4c2f676
compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
userspace arch: i386

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7bc7510fe41f/non_bootable_disk-00dcf5d8.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/68de786626b3/vmlinux-00dcf5d8.xz
kernel image: https://storage.googleapis.com/syzbot-assets/dba6f0189428/bzImage-00dcf5d8.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+badbb16b0a5dd4c2f676@xxxxxxxxxxxxxxxxxxxxxxxxx

------------[ cut here ]------------
kernel BUG at fs/jffs2/summary.c:865!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN NOPTI
CPU: 3 PID: 5545 Comm: syz-executor.3 Not tainted 6.9.0-rc3-syzkaller-00189-g00dcf5d862e8 #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:jffs2_sum_write_sumnode+0x1cf6/0x2220 fs/jffs2/summary.c:865
Code: 0f b6 04 02 84 c0 74 08 3c 03 0f 8e d7 01 00 00 8b b3 c0 05 00 00 48 c7 c2 40 b7 44 8b 48 c7 c7 40 b3 44 8b e8 ab 09 8f fe 90 <0f> 0b e8 23 6b f1 07 e8 6e b6 0a ff e9 d9 e5 ff ff 48 89 cf 48 89
RSP: 0018:ffffc9000ca874d0 EFLAGS: 00010282
RAX: 0000000000000045 RBX: ffff88801fb6a440 RCX: ffffffff816f3829
RDX: 0000000000000000 RSI: ffffffff816fc366 RDI: 0000000000000005
RBP: ffffc9000ca87650 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000080000000 R11: 0000000000000003 R12: 0000000000000000
R13: 0000000000000000 R14: ffff88805e196898 R15: ffff888059d1a000
FS: 0000000000000000(0000) GS:ffff88802c500000(0063) knlGS:00000000f5ea1b40
CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 000000c001927000 CR3: 000000005fbbe000 CR4: 0000000000350ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
jffs2_do_reserve_space+0xb52/0x1030 fs/jffs2/nodemgmt.c:388
jffs2_reserve_space+0x62e/0xba0 fs/jffs2/nodemgmt.c:197
do_jffs2_setxattr+0x1a1/0x16c0 fs/jffs2/xattr.c:1113
__vfs_setxattr+0x173/0x1e0 fs/xattr.c:200
__vfs_setxattr_noperm+0x127/0x5e0 fs/xattr.c:234
__vfs_setxattr_locked+0x182/0x260 fs/xattr.c:295
vfs_setxattr+0x146/0x350 fs/xattr.c:321
do_setxattr+0x146/0x170 fs/xattr.c:629
setxattr+0x15d/0x180 fs/xattr.c:652
path_setxattr+0x179/0x1e0 fs/xattr.c:671
__do_sys_lsetxattr fs/xattr.c:694 [inline]
__se_sys_lsetxattr fs/xattr.c:690 [inline]
__ia32_sys_lsetxattr+0xbd/0x160 fs/xattr.c:690
do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline]
__do_fast_syscall_32+0x75/0x120 arch/x86/entry/common.c:321
do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:346
entry_SYSENTER_compat_after_hwframe+0x84/0x8e
RIP: 0023:0xf72af579
Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00
RSP: 002b:00000000f5ea15ac EFLAGS: 00000292 ORIG_RAX: 00000000000000e3
RAX: ffffffffffffffda RBX: 00000000200001c0 RCX: 00000000200002c0
RDX: 0000000020002040 RSI: 0000000000001009 RDI: 0000000000000003
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000292 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:jffs2_sum_write_sumnode+0x1cf6/0x2220 fs/jffs2/summary.c:865
Code: 0f b6 04 02 84 c0 74 08 3c 03 0f 8e d7 01 00 00 8b b3 c0 05 00 00 48 c7 c2 40 b7 44 8b 48 c7 c7 40 b3 44 8b e8 ab 09 8f fe 90 <0f> 0b e8 23 6b f1 07 e8 6e b6 0a ff e9 d9 e5 ff ff 48 89 cf 48 89
RSP: 0018:ffffc9000ca874d0 EFLAGS: 00010282
RAX: 0000000000000045 RBX: ffff88801fb6a440 RCX: ffffffff816f3829
RDX: 0000000000000000 RSI: ffffffff816fc366 RDI: 0000000000000005
RBP: ffffc9000ca87650 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000080000000 R11: 0000000000000003 R12: 0000000000000000
R13: 0000000000000000 R14: ffff88805e196898 R15: ffff888059d1a000
FS: 0000000000000000(0000) GS:ffff88802c500000(0063) knlGS:00000000f5ea1b40
CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 000000c001927000 CR3: 000000005fbbe000 CR4: 0000000000350ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess), 2 bytes skipped:
0: 10 06 adc %al,(%rsi)
2: 03 74 b4 01 add 0x1(%rsp,%rsi,4),%esi
6: 10 07 adc %al,(%rdi)
8: 03 74 b0 01 add 0x1(%rax,%rsi,4),%esi
c: 10 08 adc %cl,(%rax)
e: 03 74 d8 01 add 0x1(%rax,%rbx,8),%esi
1e: 00 51 52 add %dl,0x52(%rcx)
21: 55 push %rbp
22: 89 e5 mov %esp,%ebp
24: 0f 34 sysenter
26: cd 80 int $0x80
* 28: 5d pop %rbp <-- trapping instruction
29: 5a pop %rdx
2a: 59 pop %rcx
2b: c3 ret
2c: 90 nop
2d: 90 nop
2e: 90 nop
2f: 90 nop
30: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi
37: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi


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