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
 dtReadFirst+0xc61/0xc90 fs/jfs/jfs_dtree.c:3099
 jfs_readdir+0xeda/0x5fc0 fs/jfs/jfs_dtree.c:2829
 wrap_directory_iterator+0xda/0x180 fs/readdir.c:67
 shared_jfs_readdir+0x3d/0x50 fs/jfs/namei.c:1543
 iterate_dir+0x459/0x630 fs/readdir.c:110
 __do_sys_getdents64 fs/readdir.c:399 [inline]
 __se_sys_getdents64+0x17e/0x550 fs/readdir.c:384
 __x64_sys_getdents64+0x97/0xe0 fs/readdir.c:384
 x64_sys_call+0x2b6e/0x3ea0 arch/x86/include/generated/asm/syscalls_64.h:218
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x15d/0x3c0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Local variable btstack created at:
 jfs_readdir+0xdd/0x5fc0 fs/jfs/jfs_dtree.c:2727
 wrap_directory_iterator+0xda/0x180 fs/readdir.c:67

CPU: 1 UID: 0 PID: 8117 Comm: syz.0.385 Not tainted syzkaller #0 PREEMPT(lazy) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
=====================================================