EXT4-fs (loop0): mounted filesystem without journal. Opts: discard,nodiscard,noquota,noinit_itable,stripe=0x0000000000000079,resgid=0x0000000000000000,sysvgroups,delalloc,delalloc,,errors=continue
ext4 filesystem being mounted at /root/file1 supports timestamps until 2038-01-19 (0x7fffffff)
==================================================================
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 ffff888122048ccc by task syz-executor243/287

CPU: 1 PID: 287 Comm: syz-executor243 Not tainted 5.10.234-syzkaller-00148-g6686f2996d23 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
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
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7f84c2101cf9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 61 17 00 00 90 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffe03ad2718 EFLAGS: 00000246 ORIG_RAX: 000000000000011d
RAX: ffffffffffffffda RBX: 00004000000008af RCX: 00007f84c2101cf9
RDX: 0000000000000000 RSI: 0000000000000003 RDI: 0000000000000005
RBP: 00007f84c2175610 R08: 00007ffe03ad28e8 R09: 00007ffe03ad28e8
R10: 0000000000001a00 R11: 0000000000000246 R12: 0000000000000001
R13: 00007ffe03ad28d8 R14: 0000000000000001 R15: 0000000000000001

The buggy address belongs to the page:
page:ffffea0004881200 refcount:0 mapcount:0 mapping:0000000000000000 index:0x1 pfn:0x122048
flags: 0x4000000000000000()
raw: 4000000000000000 ffffea0004881248 ffffea00048811c8 0000000000000000
raw: 0000000000000001 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner info is not present (never set?)

Memory state around the buggy address:
 ffff888122048b80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff888122048c00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff888122048c80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                                              ^
 ffff888122048d00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff888122048d80: 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: 1 PID: 287 Comm: syz-executor243 Tainted: G    B             5.10.234-syzkaller-00148-g6686f2996d23 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
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 cf b7 cf ff 48 8b 54 24 58 48 8b 74 24 40 e9 02 fa ff ff e8 1b 18 92 ff 0f 0b e8 14 18 92 ff <0f> 0b e8 0d 18 92 ff 0f 0b e8 d6 49 d5 02 e8 01 18 92 ff 0f 0b e8
RSP: 0018:ffffc90000ae7820 EFLAGS: 00010293
RAX: ffffffff81d8a74c RBX: 0000000000000000 RCX: ffff88810c9dbb40
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc90000ae7990 R08: ffffffff81d897b2 R09: ffffc90000ae7920
R10: fffff5200015cf25 R11: dffffc0000000001 R12: 0000000000000000
R13: 0000000000000000 R14: 1ffff11024409930 R15: 0000000000000000
FS:  000055557b710380(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000558382432a78 CR3: 000000010a948000 CR4: 00000000003506a0
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
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7f84c2101cf9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 61 17 00 00 90 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffe03ad2718 EFLAGS: 00000246 ORIG_RAX: 000000000000011d
RAX: ffffffffffffffda RBX: 00004000000008af RCX: 00007f84c2101cf9
RDX: 0000000000000000 RSI: 0000000000000003 RDI: 0000000000000005
RBP: 00007f84c2175610 R08: 00007ffe03ad28e8 R09: 00007ffe03ad28e8
R10: 0000000000001a00 R11: 0000000000000246 R12: 0000000000000001
R13: 00007ffe03ad28d8 R14: 0000000000000001 R15: 0000000000000001
Modules linked in:
---[ end trace 8220ca3021389ef7 ]---
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 cf b7 cf ff 48 8b 54 24 58 48 8b 74 24 40 e9 02 fa ff ff e8 1b 18 92 ff 0f 0b e8 14 18 92 ff <0f> 0b e8 0d 18 92 ff 0f 0b e8 d6 49 d5 02 e8 01 18 92 ff 0f 0b e8
RSP: 0018:ffffc90000ae7820 EFLAGS: 00010293
RAX: ffffffff81d8a74c RBX: 0000000000000000 RCX: ffff88810c9dbb40
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc90000ae7990 R08: ffffffff81d897b2 R09: ffffc90000ae7920
R10: fffff5200015cf25 R11: dffffc0000000001 R12: 0000000000000000
R13: 0000000000000000 R14: 1ffff11024409930 R15: 0000000000000000
FS:  000055557b710380(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000558382432a78 CR3: 000000010a948000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400