unable to read i-node block
==================================================================
BUG: KASAN: use-after-free in sysv_new_block+0x618/0x7e4 fs/sysv/balloc.c:113
Read of size 4 at addr ffff0000eae6d0c8 by task syz.0.278/4812

CPU: 0 PID: 4812 Comm: syz.0.278 Not tainted 5.15.176-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
Call trace:
 dump_backtrace+0x0/0x530 arch/arm64/kernel/stacktrace.c:152
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:216
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x108/0x170 lib/dump_stack.c:106
 print_address_description+0x7c/0x3f0 mm/kasan/report.c:248
 __kasan_report mm/kasan/report.c:434 [inline]
 kasan_report+0x174/0x1e4 mm/kasan/report.c:451
 __asan_report_load4_noabort+0x44/0x50 mm/kasan/report_generic.c:308
 sysv_new_block+0x618/0x7e4 fs/sysv/balloc.c:113
 alloc_branch fs/sysv/itree.c:134 [inline]
 get_block+0x258/0x1390 fs/sysv/itree.c:253
 __block_write_begin_int+0x3ec/0x1608 fs/buffer.c:2012
 __block_write_begin fs/buffer.c:2062 [inline]
 block_write_begin+0x60/0xdc fs/buffer.c:2122
 sysv_write_begin+0x50/0x98 fs/sysv/itree.c:487
 pagecache_write_begin+0xa0/0xc0 mm/filemap.c:3608
 __page_symlink+0x140/0x2b4 fs/namei.c:5177
 page_symlink+0x88/0xac fs/namei.c:5200
 sysv_symlink+0xd4/0x174 fs/sysv/namei.c:86
 vfs_symlink+0x244/0x3a8 fs/namei.c:4429
 do_symlinkat+0x364/0x6b0 fs/namei.c:4458
 __do_sys_symlinkat fs/namei.c:4475 [inline]
 __se_sys_symlinkat fs/namei.c:4472 [inline]
 __arm64_sys_symlinkat+0xa4/0xbc fs/namei.c:4472
 __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+0x7c/0x1f0 arch/arm64/kernel/entry-common.c:608
 el0t_64_sync_handler+0x84/0xe4 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:00000000e2d1a073 refcount:0 mapcount:0 mapping:0000000000000000 index:0x100 pfn:0x12ae6d
flags: 0x5ffc00000000000(node=0|zone=2|lastcpupid=0x7ff)
raw: 05ffc00000000000 dead000000000100 dead000000000122 0000000000000000
raw: 0000000000000100 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff0000eae6cf80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff0000eae6d000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff0000eae6d080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                                              ^
 ffff0000eae6d100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff0000eae6d180: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================
unable to read i-node block
unable to read i-node block
sysv_free_inode: unable to read inode block on device loop0