btstack dump:
bn = 0, index = 0
bn = 2c, index = 0
bn = 0, index = 0
bn = 2c, index = 0
bn = 0, index = 0
bn = 2c, 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 dtSearch+0x4087/0x4140 fs/jfs/jfs_dtree.c:773
 BT_STACK_DUMP fs/jfs/jfs_btree.h:136 [inline]
 dtSearch+0x4087/0x4140 fs/jfs/jfs_dtree.c:773
 jfs_lookup+0x1a2/0x510 fs/jfs/namei.c:1461
 __lookup_slow+0x506/0x6e0 fs/namei.c:1692
 lookup_slow+0x6a/0xd0 fs/namei.c:1709
 walk_component+0x467/0x650 fs/namei.c:2004
 lookup_last fs/namei.c:2461 [inline]
 path_lookupat+0x27d/0x6f0 fs/namei.c:2485
 filename_lookup+0x22f/0x750 fs/namei.c:2514
 user_path_at_empty+0x8b/0x3a0 fs/namei.c:2921
 user_path_at include/linux/namei.h:57 [inline]
 do_mount fs/namespace.c:3689 [inline]
 __do_sys_mount fs/namespace.c:3898 [inline]
 __se_sys_mount+0x66b/0x810 fs/namespace.c:3875
 __x64_sys_mount+0xe4/0x150 fs/namespace.c:3875
 x64_sys_call+0x2bf4/0x3b50 arch/x86/include/generated/asm/syscalls_64.h:166
 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_lookup+0x44/0x510 fs/jfs/namei.c:1451
 __lookup_slow+0x506/0x6e0 fs/namei.c:1692

CPU: 1 PID: 7648 Comm: syz-executor.2 Not tainted 6.9.0-rc5-syzkaller-00042-ge88c4cfcb7b8 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
=====================================================