From: syzbot <syzbot+2b2046c73fcb7e6a0e4e@syzkaller.appspotmail.com>
To: kent.overstreet@linux.dev, linux-bcachefs@vger.kernel.org,
linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com
Subject: Re: [syzbot] [bcachefs?] KMSAN: uninit-value in bch2_btree_node_get
Date: Wed, 26 Feb 2025 07:14:26 -0800 [thread overview]
Message-ID: <67bf2fd2.050a0220.1ebef.0023.GAE@google.com> (raw)
In-Reply-To: <674c2f0c.050a0220.ad585.0034.GAE@google.com>
syzbot has found a reproducer for the following issue on:
HEAD commit: ac9c34d1e45a Merge tag 'for-linus' of git://git.kernel.org..
git tree: upstream
console+strace: https://syzkaller.appspot.com/x/log.txt?x=17a4f7a4580000
kernel config: https://syzkaller.appspot.com/x/.config?x=d66f6f82ee090382
dashboard link: https://syzkaller.appspot.com/bug?extid=2b2046c73fcb7e6a0e4e
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=11da9c98580000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=177a003f980000
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/c756243ff2fa/disk-ac9c34d1.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/47bd399bb287/vmlinux-ac9c34d1.xz
kernel image: https://storage.googleapis.com/syzbot-assets/b6c5db9fcba1/bzImage-ac9c34d1.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/039e65b899b2/mount_2.gz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+2b2046c73fcb7e6a0e4e@syzkaller.appspotmail.com
bucket 0:127 gen 0 has wrong data_type: got free, should be sb, fixing
bucket 0:127 gen 0 data type sb has wrong dirty_sectors: got 0, should be 256, fixing
done
bcachefs (loop0): going read-write
bcachefs (loop0): journal_replay...
=====================================================
BUG: KMSAN: uninit-value in bch2_btree_node_get+0x5ed/0x1970 fs/bcachefs/btree_cache.c:1180
bch2_btree_node_get+0x5ed/0x1970 fs/bcachefs/btree_cache.c:1180
btree_path_down fs/bcachefs/btree_iter.c:976 [inline]
bch2_btree_path_traverse_one+0x283d/0x4790 fs/bcachefs/btree_iter.c:1202
bch2_btree_path_traverse fs/bcachefs/btree_iter.h:249 [inline]
bch2_btree_iter_traverse+0xbb8/0x1110 fs/bcachefs/btree_iter.c:1913
bch2_journal_replay_key+0x28a/0x13f0 fs/bcachefs/recovery.c:264
bch2_journal_replay+0x301d/0x4e20 fs/bcachefs/recovery.c:373
bch2_run_recovery_pass fs/bcachefs/recovery_passes.c:226 [inline]
bch2_run_recovery_passes+0x5a2/0x1160 fs/bcachefs/recovery_passes.c:291
bch2_fs_recovery+0x489c/0x6230 fs/bcachefs/recovery.c:936
bch2_fs_start+0x7ca/0xc20 fs/bcachefs/super.c:1041
bch2_fs_get_tree+0x1564/0x24e0 fs/bcachefs/fs.c:2203
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
Uninit was stored to memory at:
memcpy_u64s_small fs/bcachefs/util.h:416 [inline]
bkey_reassemble fs/bcachefs/bkey.h:506 [inline]
bch2_bkey_buf_reassemble fs/bcachefs/bkey_buf.h:28 [inline]
btree_node_iter_and_journal_peek+0x889/0x2560 fs/bcachefs/btree_iter.c:918
btree_path_down fs/bcachefs/btree_iter.c:947 [inline]
bch2_btree_path_traverse_one+0x2131/0x4790 fs/bcachefs/btree_iter.c:1202
bch2_btree_path_traverse fs/bcachefs/btree_iter.h:249 [inline]
bch2_btree_iter_traverse+0xbb8/0x1110 fs/bcachefs/btree_iter.c:1913
bch2_journal_replay_key+0x28a/0x13f0 fs/bcachefs/recovery.c:264
bch2_journal_replay+0x301d/0x4e20 fs/bcachefs/recovery.c:373
bch2_run_recovery_pass fs/bcachefs/recovery_passes.c:226 [inline]
bch2_run_recovery_passes+0x5a2/0x1160 fs/bcachefs/recovery_passes.c:291
bch2_fs_recovery+0x489c/0x6230 fs/bcachefs/recovery.c:936
bch2_fs_start+0x7ca/0xc20 fs/bcachefs/super.c:1041
bch2_fs_get_tree+0x1564/0x24e0 fs/bcachefs/fs.c:2203
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
Uninit was created at:
___kmalloc_large_node+0x22c/0x370 mm/slub.c:4249
__kmalloc_large_node_noprof+0x3f/0x1e0 mm/slub.c:4266
__do_kmalloc_node mm/slub.c:4282 [inline]
__kmalloc_node_noprof+0xc96/0x1250 mm/slub.c:4300
__kvmalloc_node_noprof+0xc0/0x2d0 mm/util.c:662
btree_node_data_alloc fs/bcachefs/btree_cache.c:156 [inline]
bch2_btree_node_mem_alloc+0xa72/0x2ee0 fs/bcachefs/btree_cache.c:834
__bch2_btree_node_alloc fs/bcachefs/btree_update_interior.c:304 [inline]
bch2_btree_reserve_get+0x37f/0x2290 fs/bcachefs/btree_update_interior.c:532
bch2_btree_update_start+0x2b0e/0x2d60 fs/bcachefs/btree_update_interior.c:1251
bch2_btree_split_leaf+0x120/0xc90 fs/bcachefs/btree_update_interior.c:1853
bch2_trans_commit_error+0x1c0/0x1d60 fs/bcachefs/btree_trans_commit.c:908
__bch2_trans_commit+0x1d5f/0xd310 fs/bcachefs/btree_trans_commit.c:1089
bch2_trans_commit fs/bcachefs/btree_update.h:183 [inline]
bch2_journal_replay+0x3125/0x4e20 fs/bcachefs/recovery.c:373
bch2_run_recovery_pass fs/bcachefs/recovery_passes.c:226 [inline]
bch2_run_recovery_passes+0x5a2/0x1160 fs/bcachefs/recovery_passes.c:291
bch2_fs_recovery+0x489c/0x6230 fs/bcachefs/recovery.c:936
bch2_fs_start+0x7ca/0xc20 fs/bcachefs/super.c:1041
bch2_fs_get_tree+0x1564/0x24e0 fs/bcachefs/fs.c:2203
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: 0 UID: 0 PID: 5784 Comm: syz-executor148 Not tainted 6.14.0-rc4-syzkaller-00052-gac9c34d1e45a #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
=====================================================
---
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.
next prev parent reply other threads:[~2025-02-26 15:14 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-12-01 9:40 syzbot
2025-02-26 15:14 ` syzbot [this message]
2025-04-01 3:59 ` [syzbot] syzbot
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