linux-kernel - [syzbot] kernel BUG in dbAllocNear

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Date:   Sat, 22 Oct 2022 02:04:35 -0700
From:   syzbot <syzbot+c6357942fbe0fce51c76@...kaller.appspotmail.com>
To:     jfs-discussion@...ts.sourceforge.net, linux-kernel@...r.kernel.org,
        shaggy@...nel.org, syzkaller-bugs@...glegroups.com
Subject: [syzbot] kernel BUG in dbAllocNear

Hello,

syzbot found the following issue on:

HEAD commit:    bbed346d5a96 Merge branch 'for-next/core' 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=177d4f76880000
kernel config:  https://syzkaller.appspot.com/x/.config?x=3a4a45d2d827c1e
dashboard link: https://syzkaller.appspot.com/bug?extid=c6357942fbe0fce51c76
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=1730f9b4880000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=14361c36880000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/e8e91bc79312/disk-bbed346d.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/c1cb3fb3b77e/vmlinux-bbed346d.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/a968af44b418/mount_0.gz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+c6357942fbe0fce51c76@...kaller.appspotmail.com

loop0: detected capacity change from 0 to 32768
BUG at fs/jfs/jfs_dmap.c:2984 assert(bitno < 32)
------------[ cut here ]------------
kernel BUG at fs/jfs/jfs_dmap.c:2984!
Internal error: Oops - BUG: 00000000f2000800 [#1] PREEMPT SMP
Modules linked in:
CPU: 1 PID: 3065 Comm: syz-executor423 Not tainted 6.0.0-rc7-syzkaller-18095-gbbed346d5a96 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/30/2022
pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : dbFindBits fs/jfs/jfs_dmap.c:2984 [inline]
pc : dbAllocNear+0x2d4/0x2d8 fs/jfs/jfs_dmap.c:1224
lr : dbFindBits fs/jfs/jfs_dmap.c:2984 [inline]
lr : dbAllocNear+0x2d4/0x2d8 fs/jfs/jfs_dmap.c:1224
sp : ffff8000126db790
x29: ffff8000126db790 x28: 0000000000000000 x27: 0000000000000000
x26: 0000000000000000 x25: 0000000000000020 x24: 0000000000000001
x23: 0000000000000020 x22: ffff0000cbd65000 x21: ffff0000cac8d000
x20: 0000000000000001 x19: ffff8000126db880 x18: 00000000000000c0
x17: ffff80000dd0b198 x16: ffff80000db49158 x15: ffff0000c68b4f80
x14: 0000000000000000 x13: 00000000ffffffff x12: ffff0000c68b4f80
x11: ff808000081c0d5c x10: 0000000000000000 x9 : 6b29d6d39c8a4400
x8 : 6b29d6d39c8a4400 x7 : ffff80000819545c x6 : 0000000000000000
x5 : 0000000000000080 x4 : 0000000000000001 x3 : 0000000000000000
x2 : ffff0001fefddcd0 x1 : 0000000100000000 x0 : 0000000000000030
Call trace:
 dbFindBits fs/jfs/jfs_dmap.c:2984 [inline]
 dbAllocNear+0x2d4/0x2d8 fs/jfs/jfs_dmap.c:1224
 dbAlloc+0x4fc/0x694 fs/jfs/jfs_dmap.c:813
 ea_get+0x354/0x548 fs/jfs/xattr.c:514
 __jfs_setxattr+0x2ac/0x5f4 fs/jfs/xattr.c:718
 __jfs_xattr_set+0x84/0x108 fs/jfs/xattr.c:917
 jfs_xattr_set+0x58/0x70 fs/jfs/xattr.c:941
 __vfs_setxattr+0x250/0x260 fs/xattr.c:182
 __vfs_setxattr_noperm+0xcc/0x320 fs/xattr.c:216
 __vfs_setxattr_locked+0x16c/0x194 fs/xattr.c:277
 vfs_setxattr+0x174/0x280 fs/xattr.c:313
 do_setxattr fs/xattr.c:600 [inline]
 setxattr fs/xattr.c:623 [inline]
 path_setxattr+0x354/0x414 fs/xattr.c:642
 __do_sys_setxattr fs/xattr.c:658 [inline]
 __se_sys_setxattr fs/xattr.c:654 [inline]
 __arm64_sys_setxattr+0x2c/0x40 fs/xattr.c:654
 __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+0x48/0x164 arch/arm64/kernel/syscall.c:206
 el0_svc+0x58/0x150 arch/arm64/kernel/entry-common.c:636
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:654
 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:581
Code: 91052821 91110863 52817502 94c9993b (d4210000) 
---[ end trace 0000000000000000 ]---


---
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