btstack dump:
bn = 0, index = 0
bn = 72c, index = 0
bn = 0, index = 0
bn = 72c, index = 0
bn = 0, index = 0
bn = 72c, 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
 dtSearch+0x3984/0x3d70 fs/jfs/jfs_dtree.c:774
 jfs_lookup+0x179/0x590 fs/jfs/namei.c:1461
 __lookup_slow+0x56a/0x770 fs/namei.c:1866
 lookup_slow+0x6a/0xd0 fs/namei.c:1883
 walk_component fs/namei.c:2229 [inline]
 lookup_last fs/namei.c:2730 [inline]
 path_lookupat+0x7d1/0xdf0 fs/namei.c:2754
 filename_lookup+0x2bc/0x800 fs/namei.c:2783
 user_path_at+0x8d/0x3e0 fs/namei.c:3576
 do_mount fs/namespace.c:4032 [inline]
 __do_sys_mount fs/namespace.c:4224 [inline]
 __se_sys_mount+0x654/0x7e0 fs/namespace.c:4201
 __x64_sys_mount+0xe4/0x150 fs/namespace.c:4201
 x64_sys_call+0x38cb/0x3e70 arch/x86/include/generated/asm/syscalls_64.h:166
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xc9/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Local variable btstack created at:
 jfs_lookup+0x44/0x590 fs/jfs/namei.c:1451
 __lookup_slow+0x56a/0x770 fs/namei.c:1866

CPU: 0 UID: 0 PID: 17298 Comm: syz.8.1706 Tainted: G             L      syzkaller #0 PREEMPT(voluntary) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/13/2026
=====================================================