EXT4-fs error (device loop2): ext4_xattr_block_get:546: inode #15: comm syz.2.16: corrupted xattr block 19
==================================================================
BUG: KASAN: use-after-free in ext4_ext_binsearch fs/ext4/extents.c:826 [inline]
BUG: KASAN: use-after-free in ext4_find_extent+0xbea/0xe30 fs/ext4/extents.c:945
Read of size 4 at addr ffff88812b65e84c by task syz.2.16/505

CPU: 1 PID: 505 Comm: syz.2.16 Not tainted 5.10.236-syzkaller-1007360-gba8b8b193394 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack_lvl+0x1e2/0x24b lib/dump_stack.c:118
 print_address_description+0x81/0x3b0 mm/kasan/report.c:248
 __kasan_report mm/kasan/report.c:435 [inline]
 kasan_report+0x179/0x1c0 mm/kasan/report.c:452
 __asan_report_load4_noabort+0x14/0x20 mm/kasan/report_generic.c:308
 ext4_ext_binsearch fs/ext4/extents.c:826 [inline]
 ext4_find_extent+0xbea/0xe30 fs/ext4/extents.c:945
 ext4_ext_remove_space+0x369/0x4e10 fs/ext4/extents.c:2826
 ext4_punch_hole+0x720/0xb10 fs/ext4/inode.c:4216
 ext4_fallocate+0x2e8/0x1cc0 fs/ext4/extents.c:4756
 vfs_fallocate+0x492/0x570 fs/open.c:310
 ksys_fallocate fs/open.c:333 [inline]
 __do_sys_fallocate fs/open.c:341 [inline]
 __se_sys_fallocate fs/open.c:339 [inline]
 __x64_sys_fallocate+0xc0/0x110 fs/open.c:339
 do_syscall_64+0x34/0x70 arch/x86/entry/common.c:-1
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7faa1d3e3169
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007faa1ce55038 EFLAGS: 00000246 ORIG_RAX: 000000000000011d
RAX: ffffffffffffffda RBX: 00007faa1d5fbfa0 RCX: 00007faa1d3e3169
RDX: 0000000000000004 RSI: 0000000000000003 RDI: 0000000000000004
RBP: 00007faa1d4642a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000010000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007faa1d5fbfa0 R15: 00007ffe2889fd28

The buggy address belongs to the page:
page:ffffea0004ad9780 refcount:0 mapcount:-128 mapping:0000000000000000 index:0x0 pfn:0x12b65e
flags: 0x4000000000000000()
raw: 4000000000000000 ffffffff86dffe78 ffffffff86dffe78 0000000000000000
raw: 0000000000000000 0000000000000001 00000000ffffff7f 0000000000000000
page dumped because: kasan: bad access detected
page_owner info is not present (never set?)

Memory state around the buggy address:
 ffff88812b65e700: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88812b65e780: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff88812b65e800: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                                              ^
 ffff88812b65e880: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88812b65e900: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================
------------[ cut here ]------------
kernel BUG at fs/ext4/extents.c:3180!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 505 Comm: syz.2.16 Tainted: G    B             5.10.236-syzkaller-1007360-gba8b8b193394 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:ext4_split_extent_at+0x121c/0x1240 fs/ext4/extents.c:3180
Code: fe c1 38 c1 0f 8c 16 fa ff ff e8 5f b7 cf ff 48 8b 54 24 58 48 8b 74 24 40 e9 02 fa ff ff e8 eb 16 92 ff 0f 0b e8 e4 16 92 ff <0f> 0b e8 dd 16 92 ff 0f 0b e8 16 9e d5 02 e8 d1 16 92 ff 0f 0b e8
RSP: 0018:ffffc90004377820 EFLAGS: 00010293
RAX: ffffffff81d8b73c RBX: 0000000000000000 RCX: ffff88811769a780
RDX: 0000000000000000 RSI: 0000000000000010 RDI: 0000000000000000
RBP: ffffc90004377990 R08: ffffffff81d8a7a2 R09: ffffc90004377920
R10: fffff5200086ef25 R11: dffffc0000000001 R12: 0000000000000000
R13: 0000000000000000 R14: 1ffff110256d0612 R15: 0000000000000000
FS:  00007faa1ce556c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000032000 CR3: 0000000116f63000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 ext4_force_split_extent_at fs/ext4/extents.c:318 [inline]
 ext4_ext_remove_space+0x719/0x4e10 fs/ext4/extents.c:2873
 ext4_punch_hole+0x720/0xb10 fs/ext4/inode.c:4216
 ext4_fallocate+0x2e8/0x1cc0 fs/ext4/extents.c:4756
 vfs_fallocate+0x492/0x570 fs/open.c:310
 ksys_fallocate fs/open.c:333 [inline]
 __do_sys_fallocate fs/open.c:341 [inline]
 __se_sys_fallocate fs/open.c:339 [inline]
 __x64_sys_fallocate+0xc0/0x110 fs/open.c:339
 do_syscall_64+0x34/0x70 arch/x86/entry/common.c:-1
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7faa1d3e3169
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007faa1ce55038 EFLAGS: 00000246 ORIG_RAX: 000000000000011d
RAX: ffffffffffffffda RBX: 00007faa1d5fbfa0 RCX: 00007faa1d3e3169
RDX: 0000000000000004 RSI: 0000000000000003 RDI: 0000000000000004
RBP: 00007faa1d4642a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000010000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007faa1d5fbfa0 R15: 00007ffe2889fd28
Modules linked in:
---[ end trace 8090decb7bfe59df ]---
RIP: 0010:ext4_split_extent_at+0x121c/0x1240 fs/ext4/extents.c:3180
Code: fe c1 38 c1 0f 8c 16 fa ff ff e8 5f b7 cf ff 48 8b 54 24 58 48 8b 74 24 40 e9 02 fa ff ff e8 eb 16 92 ff 0f 0b e8 e4 16 92 ff <0f> 0b e8 dd 16 92 ff 0f 0b e8 16 9e d5 02 e8 d1 16 92 ff 0f 0b e8
RSP: 0018:ffffc90004377820 EFLAGS: 00010293
RAX: ffffffff81d8b73c RBX: 0000000000000000 RCX: ffff88811769a780
RDX: 0000000000000000 RSI: 0000000000000010 RDI: 0000000000000000
RBP: ffffc90004377990 R08: ffffffff81d8a7a2 R09: ffffc90004377920
R10: fffff5200086ef25 R11: dffffc0000000001 R12: 0000000000000000
R13: 0000000000000000 R14: 1ffff110256d0612 R15: 0000000000000000
FS:  00007faa1ce556c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000032000 CR3: 0000000116f63000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400