ERROR: (device loop4): dtReadFirst: btstack overrun
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+0xebf/0xf00 fs/jfs/jfs_dtree.c:3102
 jfs_readdir+0x11b9/0x6db0 fs/jfs/jfs_dtree.c:2832
 wrap_directory_iterator+0xd7/0x180 fs/readdir.c:65
 shared_jfs_readdir+0x3d/0x50 fs/jfs/namei.c:1540
 iterate_dir+0x719/0x920 fs/readdir.c:108
 __do_sys_getdents64 fs/readdir.c:410 [inline]
 __se_sys_getdents64+0x17e/0x550 fs/readdir.c:396
 __ia32_sys_getdents64+0x96/0xe0 fs/readdir.c:396
 ia32_sys_call+0x4042/0x42c0 arch/x86/include/generated/asm/syscalls_32.h:221
 do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline]
 __do_fast_syscall_32+0xb0/0x150 arch/x86/entry/syscall_32.c:306
 do_fast_syscall_32+0x38/0x80 arch/x86/entry/syscall_32.c:331
 do_SYSENTER_32+0x1f/0x30 arch/x86/entry/syscall_32.c:369
 entry_SYSENTER_compat_after_hwframe+0x84/0x8e

Local variable flush created at:
 prepare_signal+0x6a/0x1150 kernel/signal.c:875
 __send_signal_locked+0x49/0x14c0 kernel/signal.c:1053

CPU: 1 UID: 0 PID: 11259 Comm: syz.4.2071 Not tainted 6.16.0-rc7-syzkaller-00138-g513fc69f8fc7 #0 PREEMPT(none) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
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