EXT4-fs error (device loop0): ext4_convert_unwritten_extents:4816: inode #19: comm kworker/u4:1: mark_inode_dirty error
EXT4-fs (loop0): failed to convert unwritten extents to written extents -- potential data loss!  (inode 19, error -117)
==================================================================
BUG: KASAN: use-after-free in ext4_ext_binsearch fs/ext4/extents.c:826 [inline]
BUG: KASAN: use-after-free in ext4_find_extent+0xbab/0xdb0 fs/ext4/extents.c:945
Read of size 4 at addr ffff88812413d784 by task kworker/u4:1/9

CPU: 0 PID: 9 Comm: kworker/u4:1 Not tainted 5.10.209-syzkaller-999850-ge7daca75b4c3 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
Workqueue: ext4-rsv-conversion ext4_end_io_rsv_work
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+0xbab/0xdb0 fs/ext4/extents.c:945
 ext4_ext_map_blocks+0x26d/0x6be0 fs/ext4/extents.c:4097
 ext4_map_blocks+0xaa7/0x1ec0 fs/ext4/inode.c:646
 ext4_convert_unwritten_extents+0x2a3/0x5a0 fs/ext4/extents.c:4808
 ext4_convert_unwritten_io_end_vec+0x104/0x180 fs/ext4/extents.c:4847
 ext4_end_io_end fs/ext4/page-io.c:189 [inline]
 ext4_do_flush_completed_IO fs/ext4/page-io.c:262 [inline]
 ext4_end_io_rsv_work+0x358/0x690 fs/ext4/page-io.c:276
 process_one_work+0x6dc/0xbd0 kernel/workqueue.c:2301
 worker_thread+0xaea/0x1510 kernel/workqueue.c:2447
 kthread+0x34b/0x3d0 kernel/kthread.c:313
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:299

The buggy address belongs to the page:
page:ffffea0004904f40 refcount:0 mapcount:0 mapping:0000000000000000 index:0x1 pfn:0x12413d
flags: 0x4000000000000000()
raw: 4000000000000000 ffffea0004904f88 ffffea0004904f08 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:
 ffff88812413d680: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88812413d700: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff88812413d780: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                   ^
 ffff88812413d800: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88812413d880: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================
EXT4-fs error (device loop0): ext4_map_blocks:716: inode #19: block 3: comm kworker/u4:1: lblock 3 mapped to illegal pblock 3 (length 1)
EXT4-fs warning (device loop0): ext4_convert_unwritten_extents:4815: inode #19: block 3: len 1: ext4_ext_map_blocks returned -117
EXT4-fs error (device loop0): __ext4_get_inode_loc:4426: comm kworker/u4:1: Invalid inode table block 34360905424 in block_group 0
EXT4-fs error (device loop0) in ext4_reserve_inode_write:5886: Corrupt filesystem
EXT4-fs error (device loop0): ext4_convert_unwritten_extents:4816: inode #19: comm kworker/u4:1: mark_inode_dirty error
EXT4-fs (loop0): failed to convert unwritten extents to written extents -- potential data loss!  (inode 19, error -117)
EXT4-fs error (device loop0): ext4_map_blocks:716: inode #19: block 4: comm kworker/u4:1: lblock 4 mapped to illegal pblock 4 (length 1)
EXT4-fs warning (device loop0): ext4_convert_unwritten_extents:4815: inode #19: block 4: len 1: ext4_ext_map_blocks returned -117
EXT4-fs error (device loop0): __ext4_get_inode_loc:4426: comm kworker/u4:1: Invalid inode table block 34360905424 in block_group 0
EXT4-fs (loop0): failed to convert unwritten extents to written extents -- potential data loss!  (inode 19, error -117)
EXT4-fs warning (device loop0): ext4_convert_unwritten_extents:4815: inode #19: block 5: len 1: ext4_ext_map_blocks returned -117
EXT4-fs (loop0): failed to convert unwritten extents to written extents -- potential data loss!  (inode 19, error -117)
EXT4-fs warning (device loop0): ext4_convert_unwritten_extents:4815: inode #19: block 6: len 1: ext4_ext_map_blocks returned -117
EXT4-fs (loop0): failed to convert unwritten extents to written extents -- potential data loss!  (inode 19, error -117)
EXT4-fs warning (device loop0): ext4_convert_unwritten_extents:4815: inode #19: block 7: len 1: ext4_ext_map_blocks returned -117
EXT4-fs (loop0): failed to convert unwritten extents to written extents -- potential data loss!  (inode 19, error -117)
EXT4-fs warning (device loop0): ext4_convert_unwritten_extents:4815: inode #19: block 8: len 1: ext4_ext_map_blocks returned -117
EXT4-fs (loop0): failed to convert unwritten extents to written extents -- potential data loss!  (inode 19, error -117)
EXT4-fs warning (device loop0): ext4_convert_unwritten_extents:4815: inode #19: block 9: len 1: ext4_ext_map_blocks returned -117
EXT4-fs (loop0): failed to convert unwritten extents to written extents -- potential data loss!  (inode 19, error -117)
EXT4-fs warning (device loop0): ext4_convert_unwritten_extents:4815: inode #19: block 10: len 1: ext4_ext_map_blocks returned -117
EXT4-fs (loop0): failed to convert unwritten extents to written extents -- potential data loss!  (inode 19, error -117)
EXT4-fs warning (device loop0): ext4_convert_unwritten_extents:4815: inode #19: block 11: len 1: ext4_ext_map_blocks returned -117
EXT4-fs (loop0): failed to convert unwritten extents to written extents -- potential data loss!  (inode 19, error -117)
EXT4-fs error (device loop5): __ext4_get_inode_loc:4426: comm kworker/u4:1: Invalid inode table block 34360905424 in block_group 0
EXT4-fs error (device loop4): __ext4_get_inode_loc:4426: comm kworker/u4:1: Invalid inode table block 34360905424 in block_group 0
EXT4-fs error (device loop5): __ext4_get_inode_loc:4426: comm kworker/u4:1: Invalid inode table block 34360905424 in block_group 0
EXT4-fs error (device loop4): ext4_map_blocks:716: inode #19: block 251: comm kworker/u4:1: lblock 43 mapped to illegal pblock 251 (length 1)
EXT4-fs warning (device loop4): ext4_convert_unwritten_extents:4815: inode #19: block 43: len 1: ext4_ext_map_blocks returned -117
EXT4-fs error (device loop4): __ext4_get_inode_loc:4426: comm kworker/u4:1: Invalid inode table block 34360905424 in block_group 0
EXT4-fs error (device loop4) in ext4_reserve_inode_write:5886: Corrupt filesystem
EXT4-fs error (device loop4): ext4_convert_unwritten_extents:4816: inode #19: comm kworker/u4:1: mark_inode_dirty error
EXT4-fs (loop4): failed to convert unwritten extents to written extents -- potential data loss!  (inode 19, error -117)
EXT4-fs error (device loop2): __ext4_get_inode_loc:4426: comm kworker/u4:1: Invalid inode table block 34360905424 in block_group 0
EXT4-fs error (device loop4): __ext4_get_inode_loc:4426: comm kworker/u4:1: Invalid inode table block 34360905424 in block_group 0
EXT4-fs error (device loop4): __ext4_get_inode_loc:4426: comm kworker/u4:1: Invalid inode table block 34360905424 in block_group 0
EXT4-fs error (device loop0): __ext4_get_inode_loc:4426: comm kworker/u4:1: Invalid inode table block 34360905424 in block_group 0
EXT4-fs error (device loop4): ext4_map_blocks:716: inode #19: block 248: comm kworker/u4:1: lblock 40 mapped to illegal pblock 248 (length 1)
EXT4-fs warning (device loop4): ext4_convert_unwritten_extents:4815: inode #19: block 40: len 1: ext4_ext_map_blocks returned -117
EXT4-fs error (device loop4): __ext4_get_inode_loc:4426: comm kworker/u4:1: Invalid inode table block 34360905424 in block_group 0
EXT4-fs error (device loop4) in ext4_reserve_inode_write:5886: Corrupt filesystem
EXT4-fs error (device loop4): ext4_convert_unwritten_extents:4816: inode #19: comm kworker/u4:1: mark_inode_dirty error
EXT4-fs (loop4): failed to convert unwritten extents to written extents -- potential data loss!  (inode 19, error -117)
EXT4-fs error (device loop4): ext4_map_blocks:716: inode #19: block 249: comm kworker/u4:1: lblock 41 mapped to illegal pblock 249 (length 1)
EXT4-fs warning (device loop4): ext4_convert_unwritten_extents:4815: inode #19: block 41: len 1: ext4_ext_map_blocks returned -117
EXT4-fs error (device loop4): __ext4_get_inode_loc:4426: comm kworker/u4:1: Invalid inode table block 34360905424 in block_group 0
EXT4-fs error (device loop4) in ext4_reserve_inode_write:5886: Corrupt filesystem
EXT4-fs error (device loop4): ext4_convert_unwritten_extents:4816: inode #19: comm kworker/u4:1: mark_inode_dirty error
EXT4-fs (loop4): failed to convert unwritten extents to written extents -- potential data loss!  (inode 19, error -117)
EXT4-fs error (device loop4): ext4_map_blocks:716: inode #19: block 16690242946121: comm kworker/u4:1: lblock 42 mapped to illegal pblock 16690242946121 (length 1)
EXT4-fs warning (device loop4): ext4_convert_unwritten_extents:4815: inode #19: block 42: len 1: ext4_ext_map_blocks returned -117
EXT4-fs (loop4): failed to convert unwritten extents to written extents -- potential data loss!  (inode 19, error -117)
EXT4-fs error (device loop4): __ext4_get_inode_loc:4426: comm kworker/u4:1: Invalid inode table block 34360905424 in block_group 0