linux-kernel - Re: [syzbot] [jfs?] KMSAN: uninit-value in diFree

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Message-ID: <67b5f71b.050a0220.14d86d.013b.GAE@google.com>
Date: Wed, 19 Feb 2025 07:22:03 -0800
From: syzbot <syzbot+df6cdcb35904203d2b6d@...kaller.appspotmail.com>
To: eadavis@...com, linux-kernel@...r.kernel.org, 
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [jfs?] KMSAN: uninit-value in diFree

Hello,

syzbot has tested the proposed patch but the reproducer is still triggering an issue:
KMSAN: uninit-value in diFree

ERROR: (device loop0): diUpdatePMap: the iag is outside the map
ERROR: (device loop0): remounting filesystem as read-only
=====================================================
BUG: KMSAN: uninit-value in hex_dump_to_buffer+0x888/0x1100 lib/hexdump.c:171
 hex_dump_to_buffer+0x888/0x1100 lib/hexdump.c:171
 print_hex_dump+0x13d/0x3e0 lib/hexdump.c:276
 diFree+0x5ba/0x4350 fs/jfs/jfs_imap.c:878
 jfs_evict_inode+0x510/0x550 fs/jfs/inode.c:156
 evict+0x723/0xd10 fs/inode.c:796
 iput_final fs/inode.c:1946 [inline]
 iput+0x97b/0xdb0 fs/inode.c:1972
 txUpdateMap+0xf3e/0x1150 fs/jfs/jfs_txnmgr.c:2367
 txLazyCommit fs/jfs/jfs_txnmgr.c:2664 [inline]
 jfs_lazycommit+0x627/0x11d0 fs/jfs/jfs_txnmgr.c:2733
 kthread+0x6b9/0xef0 kernel/kthread.c:464
 ret_from_fork+0x6d/0x90 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244

Uninit was created at:
 slab_post_alloc_hook mm/slub.c:4121 [inline]
 slab_alloc_node mm/slub.c:4164 [inline]
 __kmalloc_cache_noprof+0x8e3/0xdf0 mm/slub.c:4320
 kmalloc_noprof include/linux/slab.h:901 [inline]
 diMount+0x61/0x850 fs/jfs/jfs_imap.c:105
 jfs_mount+0xa8e/0x11d0 fs/jfs/jfs_mount.c:176
 jfs_fill_super+0xa47/0x17c0 fs/jfs/super.c:523
 get_tree_bdev_flags+0x6ec/0x910 fs/super.c:1636
 get_tree_bdev+0x37/0x50 fs/super.c:1659
 jfs_get_tree+0x34/0x40 fs/jfs/super.c:635
 vfs_get_tree+0xb1/0x5a0 fs/super.c:1814
 do_new_mount+0x71f/0x15e0 fs/namespace.c:3560
 path_mount+0x742/0x1f10 fs/namespace.c:3887
 do_mount fs/namespace.c:3900 [inline]
 __do_sys_mount fs/namespace.c:4111 [inline]
 __se_sys_mount+0x71f/0x800 fs/namespace.c:4088
 __x64_sys_mount+0xe4/0x150 fs/namespace.c:4088
 x64_sys_call+0x39bf/0x3c30 arch/x86/include/generated/asm/syscalls_64.h:166
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x1e0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

CPU: 1 UID: 0 PID: 113 Comm: jfsCommit Not tainted 6.14.0-rc3-syzkaller-00060-g6537cfb395f3-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
=====================================================


Tested on:

commit:         6537cfb3 Merge tag 'sound-6.14-rc4' of git://git.kerne..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=103f2fdf980000
kernel config:  https://syzkaller.appspot.com/x/.config?x=8cf1217edc1cc7da
dashboard link: https://syzkaller.appspot.com/bug?extid=df6cdcb35904203d2b6d
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
patch:          https://syzkaller.appspot.com/x/patch.diff?x=13f49ae4580000