btstack dump:
bn = 0, index = 4
bn = 0, index = 4
bn = 0, index = 4
bn = 0, index = 4
bn = 0, index = 4
bn = 0, index = 4
bn = 0, index = 4
=====================================================
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_slow+0x563/0x760 fs/namei.c:1858
 lookup_slow+0x6a/0xd0 fs/namei.c:1875
 walk_component fs/namei.c:2221 [inline]
 lookup_last fs/namei.c:2722 [inline]
 path_lookupat+0x7d1/0xdf0 fs/namei.c:2746
 filename_lookup+0x2bd/0x800 fs/namei.c:2775
 user_path_at+0x8d/0x3e0 fs/namei.c:3567
 do_mount fs/namespace.c:4032 [inline]
 __do_sys_mount fs/namespace.c:4224 [inline]
 __se_sys_mount+0x654/0x7e0 fs/namespace.c:4201
 __ia32_sys_mount+0xe2/0x150 fs/namespace.c:4201
 ia32_sys_call+0x2ae7/0x4340 arch/x86/include/generated/asm/syscalls_32.h:22
 do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline]
 __do_fast_syscall_32+0x15a/0x330 arch/x86/entry/syscall_32.c:307
 do_fast_syscall_32+0x38/0x80 arch/x86/entry/syscall_32.c:332
 do_SYSENTER_32+0x1f/0x30 arch/x86/entry/syscall_32.c:370
 entry_SYSENTER_compat_after_hwframe+0x84/0x8e

Local variable btstack created at:
 jfs_lookup+0x44/0x590 fs/jfs/namei.c:1451
 __lookup_slow+0x563/0x760 fs/namei.c:1858

CPU: 0 UID: 0 PID: 10778 Comm: syz.4.1156 Not tainted syzkaller #0 PREEMPT(none) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
=====================================================