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 fs/jfs/jfs_btree.h:136 [inline]
BUG: KMSAN: uninit-value in dtReadFirst+0x126d/0x1290 fs/jfs/jfs_dtree.c:3079
 BT_STACK_DUMP fs/jfs/jfs_btree.h:136 [inline]
 dtReadFirst+0x126d/0x1290 fs/jfs/jfs_dtree.c:3079
 jfs_readdir+0x111e/0x75a0 fs/jfs/jfs_dtree.c:2818
 wrap_directory_iterator+0xf9/0x1a0 fs/readdir.c:67
 shared_jfs_readdir+0x3c/0x50 fs/jfs/namei.c:1540
 iterate_dir+0x688/0x870 fs/readdir.c:110
 __do_sys_getdents64 fs/readdir.c:409 [inline]
 __se_sys_getdents64+0x169/0x530 fs/readdir.c:394
 __x64_sys_getdents64+0x96/0xe0 fs/readdir.c:394
 x64_sys_call+0x343d/0x3b50 arch/x86/include/generated/asm/syscalls_64.h:218
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcf/0x1e0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Local variable btstack created at:
 jfs_readdir+0xe4/0x75a0 fs/jfs/jfs_dtree.c:2716
 wrap_directory_iterator+0xf9/0x1a0 fs/readdir.c:67

CPU: 0 PID: 6359 Comm: syz-executor.0 Not tainted 6.9.0-rc6-syzkaller-00227-g3d25a941ea50 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
=====================================================