loop1: detected capacity change from 0 to 64 ===================================================== BUG: KMSAN: uninit-value in hfs_find_set_zero_bits+0x74d/0xb60 fs/hfs/bitmap.c:45 hfs_find_set_zero_bits+0x74d/0xb60 fs/hfs/bitmap.c:45 hfs_vbm_search_free+0x13c/0x5b0 fs/hfs/bitmap.c:151 hfs_extend_file+0x6a5/0x1b00 fs/hfs/extent.c:408 hfs_get_block+0x435/0x1150 fs/hfs/extent.c:353 __block_write_begin_int+0xa76/0x3030 fs/buffer.c:2151 block_write_begin fs/buffer.c:2262 [inline] cont_write_begin+0x10e1/0x1bc0 fs/buffer.c:2601 hfs_write_begin+0x85/0x130 fs/hfs/inode.c:52 cont_expand_zero fs/buffer.c:2528 [inline] cont_write_begin+0x35a/0x1bc0 fs/buffer.c:2591 hfs_write_begin+0x85/0x130 fs/hfs/inode.c:52 hfs_file_truncate+0x1d6/0xe60 fs/hfs/extent.c:494 hfs_inode_setattr+0x964/0xaa0 fs/hfs/inode.c:654 notify_change+0x1993/0x1aa0 fs/attr.c:552 do_truncate+0x28f/0x310 fs/open.c:68 vfs_truncate+0x921/0x9d0 fs/open.c:118 do_sys_truncate+0x103/0x240 fs/open.c:141 __do_compat_sys_truncate fs/open.c:159 [inline] __se_compat_sys_truncate fs/open.c:157 [inline] __ia32_compat_sys_truncate+0x77/0xc0 fs/open.c:157 ia32_sys_call+0xa11/0x42c0 arch/x86/include/generated/asm/syscalls_32.h:93 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 Uninit was created at: __alloc_frozen_pages_noprof+0x689/0xf00 mm/page_alloc.c:4982 alloc_pages_mpol+0x328/0x860 mm/mempolicy.c:2419 alloc_frozen_pages_noprof+0xf7/0x200 mm/mempolicy.c:2490 alloc_slab_page mm/slub.c:2451 [inline] allocate_slab+0x24d/0x1220 mm/slub.c:2619 new_slab mm/slub.c:2673 [inline] ___slab_alloc+0xfec/0x3480 mm/slub.c:3859 __slab_alloc mm/slub.c:3949 [inline] __slab_alloc_node mm/slub.c:4024 [inline] slab_alloc_node mm/slub.c:4185 [inline] __do_kmalloc_node mm/slub.c:4327 [inline] __kmalloc_noprof+0xa96/0x1310 mm/slub.c:4340 kmalloc_noprof include/linux/slab.h:909 [inline] kmalloc_array_noprof include/linux/slab.h:948 [inline] batadv_hash_new+0xc1/0x4b0 net/batman-adv/hash.c:52 batadv_tt_local_init net/batman-adv/translation-table.c:539 [inline] batadv_tt_init+0x78/0x380 net/batman-adv/translation-table.c:4107 batadv_mesh_init+0x39c/0x720 net/batman-adv/main.c:198 batadv_meshif_init_late+0x5cb/0x6d0 net/batman-adv/mesh-interface.c:813 register_netdevice+0x51b/0x25d0 net/core/dev.c:11032 batadv_meshif_newlink+0x167/0x1b0 net/batman-adv/mesh-interface.c:1088 rtnl_newlink_create+0x41c/0x1250 net/core/rtnetlink.c:3823 __rtnl_newlink net/core/rtnetlink.c:3940 [inline] rtnl_newlink+0x2f13/0x3a90 net/core/rtnetlink.c:4055 rtnetlink_rcv_msg+0x106c/0x14b0 net/core/rtnetlink.c:6944 netlink_rcv_skb+0x54a/0x680 net/netlink/af_netlink.c:2552 rtnetlink_rcv+0x35/0x40 net/core/rtnetlink.c:6971 netlink_unicast_kernel net/netlink/af_netlink.c:1320 [inline] netlink_unicast+0xee2/0x1290 net/netlink/af_netlink.c:1346 netlink_sendmsg+0x10b3/0x1250 net/netlink/af_netlink.c:1896 sock_sendmsg_nosec net/socket.c:712 [inline] __sock_sendmsg+0x333/0x3d0 net/socket.c:727 __sys_sendto+0x593/0x720 net/socket.c:2180 __do_compat_sys_socketcall net/compat.c:-1 [inline] __se_compat_sys_socketcall net/compat.c:423 [inline] __ia32_compat_sys_socketcall+0xa89/0x1af0 net/compat.c:423 ia32_sys_call+0x41be/0x42c0 arch/x86/include/generated/asm/syscalls_32.h:103 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 CPU: 0 UID: 0 PID: 6254 Comm: syz.1.97 Not tainted 6.16.0-rc6-syzkaller-00037-ge2291551827f #0 PREEMPT(none) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 =====================================================