loop1: detected capacity change from 0 to 128
VFS: Found a Xenix FS (block size = 1024) on device loop1
==================================================================
BUG: KASAN: use-after-free in sysv_new_inode+0xd54/0xec8 fs/sysv/ialloc.c:153
Read of size 2 at addr ffff0000ecd781ce by task syz.1.210/5161

CPU: 0 PID: 5161 Comm: syz.1.210 Not tainted 5.15.182-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/19/2025
Call trace:
 dump_backtrace+0x0/0x43c arch/arm64/kernel/stacktrace.c:152
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:216
 __dump_stack+0x30/0x40 lib/dump_stack.c:88
 dump_stack_lvl+0xf8/0x160 lib/dump_stack.c:106
 print_address_description+0x78/0x30c mm/kasan/report.c:248
 __kasan_report mm/kasan/report.c:434 [inline]
 kasan_report+0xec/0x15c mm/kasan/report.c:451
 __asan_report_load2_noabort+0x44/0x50 mm/kasan/report_generic.c:307
 sysv_new_inode+0xd54/0xec8 fs/sysv/ialloc.c:153
 sysv_mknod+0x5c/0x100 fs/sysv/namei.c:53
 sysv_create+0x38/0x4c fs/sysv/namei.c:67
 vfs_create+0x2bc/0x438 fs/namei.c:3162
 do_mknodat+0x41c/0x5ac fs/namei.c:3994
 __do_sys_mknodat fs/namei.c:4022 [inline]
 __se_sys_mknodat fs/namei.c:4019 [inline]
 __arm64_sys_mknodat+0xb0/0xcc fs/namei.c:4019
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181
 el0_svc+0x78/0x1e0 arch/arm64/kernel/entry-common.c:608
 el0t_64_sync_handler+0xcc/0xe4 arch/arm64/kernel/entry-common.c:626
 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584

The buggy address belongs to the page:
page:00000000881fd8c7 refcount:0 mapcount:0 mapping:0000000000000000 index:0x1 pfn:0x12cd78
flags: 0x5ffc00000000000(node=0|zone=2|lastcpupid=0x7ff)
raw: 05ffc00000000000 fffffc0003b35e48 fffffc0003b35dc8 0000000000000000
raw: 0000000000000001 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff0000ecd78080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff0000ecd78100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff0000ecd78180: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                                              ^
 ffff0000ecd78200: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff0000ecd78280: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================
attempt to access beyond end of device
loop1: rw=2049, want=6491538, limit=128
Buffer I/O error on dev loop1, logical block 3245768, lost async page write