EXT4-fs (loop0): Remounting filesystem read-only
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BUG: KASAN: out-of-bounds in ext4_ext_rm_leaf fs/ext4/extents.c:2715 [inline]
BUG: KASAN: out-of-bounds in ext4_ext_remove_space+0x2150/0x4390 fs/ext4/extents.c:2937
Read of size 18446744073709551544 at addr ffff888066ad0054 by task syz-executor.0/7939

CPU: 1 PID: 7939 Comm: syz-executor.0 Not tainted 5.15.183-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/19/2025
Call Trace:
 <TASK>
 dump_stack_lvl+0x168/0x230 lib/dump_stack.c:106
 print_address_description+0x60/0x2d0 mm/kasan/report.c:248
 __kasan_report mm/kasan/report.c:434 [inline]
 kasan_report+0xdf/0x130 mm/kasan/report.c:451
 check_region_inline mm/kasan/generic.c:-1 [inline]
 kasan_check_range+0x27b/0x290 mm/kasan/generic.c:189
 memmove+0x25/0x60 mm/kasan/shadow.c:54
 ext4_ext_rm_leaf fs/ext4/extents.c:2715 [inline]
 ext4_ext_remove_space+0x2150/0x4390 fs/ext4/extents.c:2937
 ext4_punch_hole+0x7c6/0xc20 fs/ext4/inode.c:4100
 ext4_fallocate+0x2a4/0x1ee0 fs/ext4/extents.c:4763
 vfs_fallocate+0x587/0x6f0 fs/open.c:308
 ioctl_preallocate fs/ioctl.c:294 [inline]
 file_ioctl fs/ioctl.c:-1 [inline]
 do_vfs_ioctl+0x1b70/0x1de0 fs/ioctl.c:853
 __do_sys_ioctl fs/ioctl.c:872 [inline]
 __se_sys_ioctl+0x83/0x170 fs/ioctl.c:860
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f46e70ddda9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 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 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f46e641d0c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f46e720d120 RCX: 00007f46e70ddda9
RDX: 0000000020000080 RSI: 000000004030582b RDI: 0000000000000004
RBP: 00007f46e712a47a R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000006e R14: 00007f46e720d120 R15: 00007fff78db4da8
 </TASK>

The buggy address belongs to the page:
page:ffffea00019ab400 refcount:2 mapcount:0 mapping:ffff888140895af0 index:0x11 pfn:0x66ad0
memcg:ffff888075f88000
aops:def_blk_aops ino:700000
flags: 0xfff00000002036(referenced|uptodate|lru|active|private|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000002036 ffffea0001f58bc8 ffff8880197a1030 ffff888140895af0
raw: 0000000000000011 ffff8880714271d0 00000002ffffffff ffff888075f88000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Movable, gfp_mask 0x108c48(GFP_NOFS|__GFP_NOFAIL|__GFP_HARDWALL|__GFP_MOVABLE), pid 7926, ts 259334036705, free_ts 259208793762
 prep_new_page mm/page_alloc.c:2426 [inline]
 get_page_from_freelist+0x1b77/0x1c60 mm/page_alloc.c:4192
 __alloc_pages+0x1e1/0x470 mm/page_alloc.c:5466
 __page_cache_alloc+0xd2/0x3f0 mm/filemap.c:1022
 pagecache_get_page+0x986/0xef0 mm/filemap.c:1940
 find_or_create_page include/linux/pagemap.h:420 [inline]
 grow_dev_page fs/buffer.c:949 [inline]
 grow_buffers fs/buffer.c:1014 [inline]
 __getblk_slow fs/buffer.c:1041 [inline]
 __getblk_gfp+0x249/0xb70 fs/buffer.c:1336
 sb_getblk_gfp include/linux/buffer_head.h:368 [inline]
 ext4_ext_grow_indepth fs/ext4/extents.c:1330 [inline]
 ext4_ext_create_new_leaf fs/ext4/extents.c:1431 [inline]
 ext4_ext_insert_extent+0x110f/0x47e0 fs/ext4/extents.c:2102
 ext4_ext_map_blocks+0x15c1/0x64e0 fs/ext4/extents.c:4360
 ext4_map_blocks+0x981/0x1b30 fs/ext4/inode.c:673
 _ext4_get_block+0x1d7/0x4e0 fs/ext4/inode.c:816
 ext4_block_write_begin+0x60f/0x1210 fs/ext4/inode.c:1101
 ext4_write_begin+0x6c2/0x15c0 fs/ext4/ext4_jbd2.h:-1
 ext4_da_write_begin+0x435/0xb30 fs/ext4/inode.c:2975
 generic_perform_write+0x2aa/0x530 mm/filemap.c:3785
 ext4_buffered_write_iter+0x25f/0x3b0 fs/ext4/file.c:268
 ext4_file_write_iter+0x773/0x17b0 fs/ext4/file.c:-1
 call_write_iter include/linux/fs.h:2172 [inline]
 new_sync_write fs/read_write.c:507 [inline]
 vfs_write+0x712/0xd00 fs/read_write.c:594
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1340 [inline]
 free_pcp_prepare mm/page_alloc.c:1391 [inline]
 free_unref_page_prepare+0x637/0x6c0 mm/page_alloc.c:3317
 free_unref_page_list+0x122/0x7e0 mm/page_alloc.c:3433
 release_pages+0x184b/0x1bb0 mm/swap.c:963
 __pagevec_release+0x6d/0xe0 mm/swap.c:983
 pagevec_release include/linux/pagevec.h:81 [inline]
 shmem_undo_range+0x593/0x1840 mm/shmem.c:964
 shmem_truncate_range mm/shmem.c:1063 [inline]
 shmem_evict_inode+0x20d/0xa00 mm/shmem.c:1145
 evict+0x485/0x870 fs/inode.c:647
 __dentry_kill+0x431/0x650 fs/dcache.c:586
 dentry_kill+0xb8/0x290 fs/dcache.c:-1
 dput+0xd8/0x1a0 fs/dcache.c:893
 __fput+0x5ee/0x930 fs/file_table.c:319
 task_work_run+0x125/0x1a0 kernel/task_work.c:188
 tracehook_notify_resume include/linux/tracehook.h:189 [inline]
 exit_to_user_mode_loop+0x10f/0x130 kernel/entry/common.c:181
 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:214
 __syscall_exit_to_user_mode_work kernel/entry/common.c:296 [inline]
 syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:307
 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:86

Memory state around the buggy address:
 ffff888066acff00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff888066acff80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff888066ad0000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
                                                 ^
 ffff888066ad0080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff888066ad0100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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