[syzbot] [bcachefs?] KMSAN: uninit-value in bch2_btree_ptr_v2_validate

From: syzbot
Date: Tue Feb 04 2025 - 10:33:45 EST

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Hello,

syzbot found the following issue on:

HEAD commit: 0de63bb7d919 Merge tag 'pull-fix' of git://git.kernel.org/..
git tree: upstream
console+strace: https://syzkaller.appspot.com/x/log.txt?x=110078a4580000
kernel config: https://syzkaller.appspot.com/x/.config?x=f20bce78db15972a
dashboard link: https://syzkaller.appspot.com/bug?extid=655143dc5f99972b52e6
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=11c74f64580000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=15c74f64580000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/b06dbcd0bfdc/disk-0de63bb7.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/bc7060cef2b6/vmlinux-0de63bb7.xz
kernel image: https://storage.googleapis.com/syzbot-assets/3578d0574f33/bzImage-0de63bb7.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/eec1bd50a821/mount_2.gz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+655143dc5f99972b52e6@xxxxxxxxxxxxxxxxxxxxxxxxx

bucket incorrectly unset in freespace btree
u64s 5 type deleted 0:29:0 len 0 ver 0, , continuing
=====================================================
BUG: KMSAN: uninit-value in bpos_le fs/bcachefs/bkey.h:113 [inline]
BUG: KMSAN: uninit-value in bpos_ge fs/bcachefs/bkey.h:125 [inline]
BUG: KMSAN: uninit-value in bch2_btree_ptr_v2_validate+0x51c/0xb20 fs/bcachefs/extents.c:211
bpos_le fs/bcachefs/bkey.h:113 [inline]
bpos_ge fs/bcachefs/bkey.h:125 [inline]
bch2_btree_ptr_v2_validate+0x51c/0xb20 fs/bcachefs/extents.c:211
bch2_bkey_val_validate+0x357/0x530 fs/bcachefs/bkey_methods.c:143
btree_node_bkey_val_validate fs/bcachefs/btree_io.c:838 [inline]
bset_key_validate fs/bcachefs/btree_io.c:859 [inline]
validate_bset_keys+0x20e3/0x2350 fs/bcachefs/btree_io.c:942
validate_bset_for_write+0x2b3/0x410 fs/bcachefs/btree_io.c:1987
__bch2_btree_node_write+0x53df/0x6830 fs/bcachefs/btree_io.c:2197
bch2_btree_node_write_trans+0xd7/0x890 fs/bcachefs/btree_io.c:2357
btree_node_write_if_need fs/bcachefs/btree_io.h:153 [inline]
btree_update_nodes_written fs/bcachefs/btree_update_interior.c:816 [inline]
btree_interior_update_work+0x3e3f/0x4820 fs/bcachefs/btree_update_interior.c:844
process_one_work kernel/workqueue.c:3236 [inline]
process_scheduled_works+0xae0/0x1c40 kernel/workqueue.c:3317
worker_thread+0xea7/0x14f0 kernel/workqueue.c:3398
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 stored to memory at:
memcpy_u64s_small fs/bcachefs/util.h:416 [inline]
bkey_p_copy fs/bcachefs/bkey.h:40 [inline]
bch2_sort_keys_keep_unwritten_whiteouts+0x17d1/0x19d0 fs/bcachefs/bkey_sort.c:187
__bch2_btree_node_write+0x3ae8/0x6830 fs/bcachefs/btree_io.c:2140
bch2_btree_node_write_trans+0xd7/0x890 fs/bcachefs/btree_io.c:2357
btree_node_write_if_need fs/bcachefs/btree_io.h:153 [inline]
btree_update_nodes_written fs/bcachefs/btree_update_interior.c:816 [inline]
btree_interior_update_work+0x3e3f/0x4820 fs/bcachefs/btree_update_interior.c:844
process_one_work kernel/workqueue.c:3236 [inline]
process_scheduled_works+0xae0/0x1c40 kernel/workqueue.c:3317
worker_thread+0xea7/0x14f0 kernel/workqueue.c:3398
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:
___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+0x1af9/0x2d60 fs/bcachefs/btree_update_interior.c:1230
bch2_btree_split_leaf+0x120/0xc90 fs/bcachefs/btree_update_interior.c:1851
bch2_trans_commit_error+0x1c0/0x1d60 fs/bcachefs/btree_trans_commit.c:908
__bch2_trans_commit+0x1d60/0xd310 fs/bcachefs/btree_trans_commit.c:1085
bch2_trans_commit fs/bcachefs/btree_update.h:183 [inline]
bch2_journal_replay+0x3082/0x4d30 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:1030
bch2_fs_get_tree+0x143a/0x2330 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: 1 UID: 0 PID: 1092 Comm: kworker/u8:7 Not tainted 6.14.0-rc1-syzkaller-00020-g0de63bb7d919 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
Workqueue: btree_update btree_interior_update_work
=====================================================

---
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Next message: syzbot: "[syzbot] [mm?] [bcachefs?] UBSAN: shift-out-of-bounds in xas_create"
Previous message: syzbot: "[syzbot] [block?] BUG: sleeping function called from invalid context in unmap_mapping_folio"
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