==================================================================
BUG: KASAN: use-after-free in sysv_new_inode+0xda8/0xf20 fs/sysv/ialloc.c:153
Read of size 2 at addr ffff0001108e01ce by task syz.6.23/5360

CPU: 1 PID: 5360 Comm: syz.6.23 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
Call trace:
 dump_backtrace+0x1c0/0x1ec arch/arm64/kernel/stacktrace.c:158
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165
 __dump_stack+0x30/0x40 lib/dump_stack.c:88
 dump_stack_lvl+0xf4/0x15c lib/dump_stack.c:106
 print_address_description+0x88/0x218 mm/kasan/report.c:316
 print_report+0x50/0x68 mm/kasan/report.c:420
 kasan_report+0xa8/0xfc mm/kasan/report.c:524
 __asan_report_load2_noabort+0x2c/0x38 mm/kasan/report_generic.c:349
 sysv_new_inode+0xda8/0xf20 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:3192
 do_mknodat+0x364/0x558 fs/namei.c:4043
 __do_sys_mknodat fs/namei.c:4071 [inline]
 __se_sys_mknodat fs/namei.c:4068 [inline]
 __arm64_sys_mknodat+0xb0/0xcc fs/namei.c:4068
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2b4 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140
 do_el0_svc+0x58/0x130 arch/arm64/kernel/syscall.c:204
 el0_svc+0x58/0x128 arch/arm64/kernel/entry-common.c:637
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585

The buggy address belongs to the physical page:
page:000000005b0c30ab refcount:0 mapcount:0 mapping:0000000000000000 index:0x1 pfn:0x1508e0
flags: 0x5ffc00000000000(node=0|zone=2|lastcpupid=0x7ff)
raw: 05ffc00000000000 fffffc0004423848 fffffc000436ca48 0000000000000000
raw: 0000000000000001 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff0001108e0080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff0001108e0100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff0001108e0180: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                                              ^
 ffff0001108e0200: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff0001108e0280: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================
syz.6.23: attempt to access beyond end of device
loop6: rw=0, sector=6491536, nr_sectors = 2 limit=128
Buffer I/O error on dev loop6, logical block 3245768, async page read
syz.6.23: attempt to access beyond end of device
loop6: rw=0, sector=17666806, nr_sectors = 2 limit=128
Buffer I/O error on dev loop6, logical block 8833403, async page read
syz.6.23: attempt to access beyond end of device
loop6: rw=0, sector=26539618, nr_sectors = 2 limit=128
Buffer I/O error on dev loop6, logical block 13269809, async page read
syz.6.23: attempt to access beyond end of device
loop6: rw=0, sector=16147212, nr_sectors = 2 limit=128
Buffer I/O error on dev loop6, logical block 8073606, async page read
sysv_free_block: flc_count > flc_size
sysv_free_block: flc_count > flc_size
sysv_free_block: flc_count > flc_size
sysv_free_block: flc_count > flc_size
sysv_free_block: flc_count > flc_size
sysv_free_block: flc_count > flc_size
sysv_free_block: flc_count > flc_size
sysv_free_block: flc_count > flc_size
sysv_free_block: flc_count > flc_size
sysv_free_block: flc_count > flc_size
sysv_free_inode: inode 0,1,2 or nonexistent inode