ERROR: (device loop1): dtReadFirst: btstack overrun
ERROR: (device loop1): remounting filesystem as read-only
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+0x138b/0x13b0 fs/jfs/jfs_dtree.c:3089
 BT_STACK_DUMP fs/jfs/jfs_btree.h:136 [inline]
 dtReadFirst+0x138b/0x13b0 fs/jfs/jfs_dtree.c:3089
 jfs_readdir+0x1093/0x6450 fs/jfs/jfs_dtree.c:2820
 wrap_directory_iterator+0xf3/0x190 fs/readdir.c:65
 shared_jfs_readdir+0x3c/0x50 fs/jfs/namei.c:1540
 iterate_dir+0x5b3/0x9e0 fs/readdir.c:108
 __do_sys_getdents64 fs/readdir.c:403 [inline]
 __se_sys_getdents64+0x170/0x540 fs/readdir.c:389
 __x64_sys_getdents64+0x96/0xe0 fs/readdir.c:389
 x64_sys_call+0x3b0f/0x3c30 arch/x86/include/generated/asm/syscalls_64.h:218
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x1e0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Local variable btstack created at:
 jfs_readdir+0xe2/0x6450 fs/jfs/jfs_dtree.c:2718
 wrap_directory_iterator+0xf3/0x190 fs/readdir.c:65

CPU: 1 UID: 0 PID: 6141 Comm: syz.1.60 Not tainted 6.12.0-syzkaller-11677-g2ba9f676d0a2 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
=====================================================