linux-kernel - Re: [syzbot] [reiserfs?] WARNING in reiserfs_readdir

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Message-ID: <0000000000008955d005f4dba008@google.com>
Date:   Thu, 16 Feb 2023 17:56:51 -0800
From:   syzbot <syzbot+798ffe5fe3e88235db59@...kaller.appspotmail.com>
To:     linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        reiserfs-devel@...r.kernel.org, syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [reiserfs?] WARNING in reiserfs_readdir_inode

syzbot has found a reproducer for the following issue on:

HEAD commit:    2d3827b3f393 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=14eb7f2b480000
kernel config:  https://syzkaller.appspot.com/x/.config?x=606ed7eeab569393
dashboard link: https://syzkaller.appspot.com/bug?extid=798ffe5fe3e88235db59
compiler:       Debian clang version 15.0.7, GNU ld (GNU Binutils for Debian) 2.35.2
userspace arch: arm64
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=150829d7480000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=11ff04ab480000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/fd94d68ff17d/disk-2d3827b3.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/f304fbef0773/vmlinux-2d3827b3.xz
kernel image: https://storage.googleapis.com/syzbot-assets/74eb318f51b0/Image-2d3827b3.gz.xz
mounted in repro #1: https://storage.googleapis.com/syzbot-assets/37f569d9f961/mount_0.gz
mounted in repro #2: https://storage.googleapis.com/syzbot-assets/0cd68cef0305/mount_1.gz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+798ffe5fe3e88235db59@...kaller.appspotmail.com

------------[ cut here ]------------
DEBUG_LOCKS_WARN_ON(lock->magic != lock)
WARNING: CPU: 0 PID: 4421 at kernel/locking/mutex.c:582 __mutex_lock_common+0x504/0xf64 kernel/locking/mutex.c:582
Modules linked in:
CPU: 0 PID: 4421 Comm: syz-executor270 Not tainted 6.2.0-rc7-syzkaller-17907-g2d3827b3f393 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/21/2023
pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : __mutex_lock_common+0x504/0xf64 kernel/locking/mutex.c:582
lr : __mutex_lock_common+0x504/0xf64 kernel/locking/mutex.c:582
sp : ffff80000ff739e0
x29: ffff80000ff73a50 x28: ffff80000eeb4000 x27: 0000000000000000

x26: 0000000000000000 x25: ffff800008748194 x24: 0000000000000002
x23: ffff800008771cc4 x22: 0000000000000000 x21: 0000000000000000
x20: 0000000000000000 x19: ffff0000c7bf7828 x18: 0000000000000000
x17: 0000000000000000 x16: 0000000000000000 x15: 0000000000000000
x14: 0000000000000000 x13: 0000000000000012 x12: ffff0000c3a31a00
x11: ff808000081bbb4c x10: 0000000000000000 x9 : f02dd3de9c24e500
x8 : f02dd3de9c24e500 x7 : 4e5241575f534b43 x6 : ffff80000bf650d4
x5 : 0000000000000000 x4 : 0000000000000001 x3 : 0000000000000000
x2 : 0000000000000000 x1 : 0000000100000000 x0 : 0000000000000028
Call trace:
 __mutex_lock_common+0x504/0xf64 kernel/locking/mutex.c:582
 __mutex_lock kernel/locking/mutex.c:747 [inline]
 mutex_lock_nested+0x38/0x44 kernel/locking/mutex.c:799
 reiserfs_write_lock+0x3c/0x64 fs/reiserfs/lock.c:27
 reiserfs_readdir_inode+0x9c/0x660 fs/reiserfs/dir.c:79
 reiserfs_readdir+0x28/0x38 fs/reiserfs/dir.c:274
 iterate_dir+0x114/0x28c
 __do_sys_getdents64 fs/readdir.c:369 [inline]
 __se_sys_getdents64 fs/readdir.c:354 [inline]
 __arm64_sys_getdents64+0x80/0x204 fs/readdir.c:354
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x64/0x178 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0xbc/0x180 arch/arm64/kernel/syscall.c:142
 do_el0_svc+0x48/0x110 arch/arm64/kernel/syscall.c:193
 el0_svc+0x58/0x14c arch/arm64/kernel/entry-common.c:637
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:591
irq event stamp: 24433
hardirqs last  enabled at (24433): [<ffff800008039178>] local_daif_restore arch/arm64/include/asm/daifflags.h:75 [inline]
hardirqs last  enabled at (24433): [<ffff800008039178>] el0_svc_common+0x40/0x180 arch/arm64/kernel/syscall.c:107
hardirqs last disabled at (24432): [<ffff80000bf55074>] el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
softirqs last  enabled at (24376): [<ffff80000801c878>] local_bh_enable+0x10/0x34 include/linux/bottom_half.h:32
softirqs last disabled at (24374): [<ffff80000801c844>] local_bh_disable+0x10/0x34 include/linux/bottom_half.h:19
---[ end trace 0000000000000000 ]---