btstack dump:
bn = 0, index = 0
bn = 0, index = 0
bn = 0, index = 0
bn = 0, index = 0
bn = 0, index = 0
bn = 0, index = 0
bn = 0, index = 0
=====================================================
BUG: KMSAN: uninit-value in BT_STACK_DUMP+0x5e5/0x600 fs/jfs/jfs_btree.h:136
 BT_STACK_DUMP+0x5e5/0x600 fs/jfs/jfs_btree.h:136
 dtSearch+0x393f/0x3d30 fs/jfs/jfs_dtree.c:774
 jfs_lookup+0x179/0x590 fs/jfs/namei.c:1461
 lookup_one_qstr_excl+0x23c/0x7a0 fs/namei.c:1697
 filename_create+0x2cb/0x590 fs/namei.c:4140
 do_mkdirat+0x66/0xf30 fs/namei.c:4391
 __do_sys_mkdirat fs/namei.c:4416 [inline]
 __se_sys_mkdirat fs/namei.c:4414 [inline]
 __x64_sys_mkdirat+0xc1/0x140 fs/namei.c:4414
 x64_sys_call+0x338/0x3e20 arch/x86/include/generated/asm/syscalls_64.h:259
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xd9/0x210 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Local variable btstack created at:
 jfs_lookup+0x44/0x590 fs/jfs/namei.c:1451
 lookup_one_qstr_excl+0x23c/0x7a0 fs/namei.c:1697

CPU: 1 UID: 0 PID: 12275 Comm: syz.6.1703 Tainted: G        W           6.16.0-syzkaller-11322-g352af6a011d5 #0 PREEMPT(none) 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
=====================================================