==================================================================
BUG: KASAN: use-after-free in ext4_ext_binsearch fs/ext4/extents.c:840 [inline]
BUG: KASAN: use-after-free in ext4_find_extent+0x94c/0xb0c fs/ext4/extents.c:955
Read of size 4 at addr ffff0000df5f621c by task kworker/u8:7/2180

CPU: 1 UID: 0 PID: 2180 Comm: kworker/u8:7 Not tainted 6.14.0-rc3-syzkaller-ga1c24ab82279 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
Workqueue: writeback wb_workfn (flush-7:0)
Call trace:
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:466 (C)
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0xe4/0x150 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:378 [inline]
 print_report+0x198/0x538 mm/kasan/report.c:489
 kasan_report+0xd8/0x138 mm/kasan/report.c:602
 __asan_report_load4_noabort+0x20/0x2c mm/kasan/report_generic.c:380
 ext4_ext_binsearch fs/ext4/extents.c:840 [inline]
 ext4_find_extent+0x94c/0xb0c fs/ext4/extents.c:955
 ext4_ext_map_blocks+0x2b0/0x6600 fs/ext4/extents.c:4205
 ext4_map_create_blocks fs/ext4/inode.c:516 [inline]
 ext4_map_blocks+0x710/0x15d0 fs/ext4/inode.c:702
 mpage_map_one_extent fs/ext4/inode.c:2219 [inline]
 mpage_map_and_submit_extent fs/ext4/inode.c:2272 [inline]
 ext4_do_writepages+0x195c/0x318c fs/ext4/inode.c:2735
 ext4_writepages+0x198/0x308 fs/ext4/inode.c:2824
 do_writepages+0x304/0x7d0 mm/page-writeback.c:2687
 __writeback_single_inode+0x15c/0x15a4 fs/fs-writeback.c:1680
 writeback_sb_inodes+0x650/0x1088 fs/fs-writeback.c:1976
 __writeback_inodes_wb+0xec/0x234 fs/fs-writeback.c:2047
 wb_writeback+0x3f4/0xe9c fs/fs-writeback.c:2158
 wb_check_old_data_flush fs/fs-writeback.c:2262 [inline]
 wb_do_writeback fs/fs-writeback.c:2315 [inline]
 wb_workfn+0xb9c/0x1048 fs/fs-writeback.c:2343
 process_one_work+0x810/0x1638 kernel/workqueue.c:3236
 process_scheduled_works kernel/workqueue.c:3317 [inline]
 worker_thread+0x97c/0xeec kernel/workqueue.c:3398
 kthread+0x65c/0x7b0 kernel/kthread.c:464
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:862

The buggy address belongs to the physical page:
page: refcount:2 mapcount:0 mapping:000000005c145e5a index:0x2de pfn:0x11f5f6
memcg:ffff0000c19b4000
aops:ext4_da_aops ino:6ca dentry name(?):"memory.events.local"
flags: 0x5ffc00000004038(uptodate|dirty|lru|private|node=0|zone=2|lastcpupid=0x7ff)
raw: 05ffc00000004038 fffffdffc37d7d48 fffffdffc37d7dc8 ffff0000deaa3658
raw: 00000000000002de ffff0000e6c11ae0 00000002ffffffff ffff0000c19b4000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff0000df5f6100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff0000df5f6180: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff0000df5f6200: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
                            ^
 ffff0000df5f6280: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff0000df5f6300: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================
EXT4-fs error (device loop0): ext4_ext_split:1150: inode #19: comm kworker/u8:7: eh_entries 26982 != eh_max 25964!
EXT4-fs (loop0): Delayed block allocation failed for inode 19 at logical offset 0 with max blocks 1 with error 117
EXT4-fs (loop0): This should not happen!! Data will be lost