loop1: detected capacity change from 0 to 64
=====================================================
BUG: KMSAN: uninit-value in __hfs_ext_read_extent fs/hfs/extent.c:160 [inline]
BUG: KMSAN: uninit-value in __hfs_ext_cache_extent+0x69f/0x7e0 fs/hfs/extent.c:179
 __hfs_ext_read_extent fs/hfs/extent.c:160 [inline]
 __hfs_ext_cache_extent+0x69f/0x7e0 fs/hfs/extent.c:179
 hfs_ext_read_extent fs/hfs/extent.c:202 [inline]
 hfs_extend_file+0x44c/0x19f0 fs/hfs/extent.c:401
 hfs_get_block+0x3d8/0xf50 fs/hfs/extent.c:353
 __block_write_begin_int+0xa73/0x2f80 fs/buffer.c:2116
 block_write_begin fs/buffer.c:2227 [inline]
 cont_write_begin+0xf84/0x1950 fs/buffer.c:2566
 hfs_write_begin+0x85/0x120 fs/hfs/inode.c:52
 cont_expand_zero fs/buffer.c:2493 [inline]
 cont_write_begin+0x32f/0x1950 fs/buffer.c:2556
 hfs_write_begin+0x85/0x120 fs/hfs/inode.c:52
 generic_perform_write+0x405/0x1060 mm/filemap.c:4102
 __generic_file_write_iter+0x207/0x460 mm/filemap.c:4219
 generic_file_write_iter+0x10c/0x930 mm/filemap.c:4245
 do_iter_readv_writev+0x93d/0xbc0 fs/read_write.c:-1
 vfs_writev+0x56a/0x14e0 fs/read_write.c:1055
 do_pwritev fs/read_write.c:1151 [inline]
 __do_sys_pwritev2 fs/read_write.c:1209 [inline]
 __se_sys_pwritev2+0x262/0x460 fs/read_write.c:1200
 __x64_sys_pwritev2+0x11f/0x1a0 fs/read_write.c:1200
 x64_sys_call+0x2120/0x3c80 arch/x86/include/generated/asm/syscalls_64.h:329
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0x1e0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Uninit was created at:
 __alloc_frozen_pages_noprof+0x6a0/0xe30 mm/page_alloc.c:4957
 alloc_pages_mpol+0x4cd/0x890 mm/mempolicy.c:2301
 alloc_frozen_pages_noprof+0x1bf/0x1e0 mm/mempolicy.c:2372
 alloc_slab_page mm/slub.c:2459 [inline]
 allocate_slab+0x23a/0x1110 mm/slub.c:2623
 new_slab mm/slub.c:2676 [inline]
 ___slab_alloc+0x128a/0x3550 mm/slub.c:3862
 __slab_alloc mm/slub.c:3952 [inline]
 __slab_alloc_node mm/slub.c:4027 [inline]
 slab_alloc_node mm/slub.c:4188 [inline]
 __do_kmalloc_node mm/slub.c:4330 [inline]
 __kmalloc_node_track_caller_noprof+0xa9e/0x1260 mm/slub.c:4350
 __kmemdup_nul mm/util.c:63 [inline]
 kstrdup+0x93/0x280 mm/util.c:83
 kstrdup_const+0x5e/0x90 mm/util.c:103
 __kernfs_new_node+0x7d/0xa50 fs/kernfs/dir.c:633
 kernfs_new_node+0x21a/0x380 fs/kernfs/dir.c:713
 __kernfs_create_file+0x9e/0x4f0 fs/kernfs/file.c:1038
 cgroup_add_file kernel/cgroup/cgroup.c:4261 [inline]
 cgroup_addrm_files+0xaf7/0xfb0 kernel/cgroup/cgroup.c:4315
 css_populate_dir+0x16a/0x780 kernel/cgroup/cgroup.c:1774
 cgroup_apply_control_enable+0x17a9/0x2650 kernel/cgroup/cgroup.c:3261
 cgroup_mkdir+0x1364/0x28a0 kernel/cgroup/cgroup.c:5857
 kernfs_iop_mkdir+0x304/0x530 fs/kernfs/dir.c:1266
 vfs_mkdir+0x4f7/0x830 fs/namei.c:4324
 do_mkdirat+0x3db/0x870 fs/namei.c:4357
 __do_sys_mkdirat fs/namei.c:4374 [inline]
 __se_sys_mkdirat fs/namei.c:4372 [inline]
 __x64_sys_mkdirat+0xc6/0x120 fs/namei.c:4372
 x64_sys_call+0x3a33/0x3c80 arch/x86/include/generated/asm/syscalls_64.h:259
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0x1e0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

CPU: 0 UID: 0 PID: 7922 Comm: syz.1.550 Not tainted 6.15.0-rc1-syzkaller-00308-gecd5d67ad602 #0 PREEMPT(undef) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
=====================================================