EXT4-fs error (device loop5): ext4_convert_unwritten_extents:4816: inode #19: comm kworker/u4:1: mark_inode_dirty error
EXT4-fs (loop5): 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 ffff888124d8a784 by task kworker/u4:1/9

CPU: 0 PID: 9 Comm: kworker/u4:1 Not tainted 5.10.195-syzkaller-989648-g03a17e06abe5 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/06/2023
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:ffffea0004936280 refcount:0 mapcount:0 mapping:0000000000000000 index:0x1 pfn:0x124d8a
flags: 0x4000000000000000()
raw: 4000000000000000 ffffea00049362c8 ffffea00049369c8 0000000000000000
raw: 0000000000000001 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as freed
page last allocated via order 0, migratetype Movable, gfp_mask 0x101cca(GFP_HIGHUSER_MOVABLE|__GFP_WRITE), pid 398, ts 43652399175, free_ts 44052196164
 set_page_owner include/linux/page_owner.h:35 [inline]
 post_alloc_hook mm/page_alloc.c:2456 [inline]
 prep_new_page+0x166/0x180 mm/page_alloc.c:2462
 get_page_from_freelist+0x2d8c/0x2f30 mm/page_alloc.c:4254
 __alloc_pages_nodemask+0x435/0xaf0 mm/page_alloc.c:5346
 __alloc_pages include/linux/gfp.h:544 [inline]
 __alloc_pages_node include/linux/gfp.h:557 [inline]
 alloc_pages_node include/linux/gfp.h:571 [inline]
 alloc_pages include/linux/gfp.h:590 [inline]
 __page_cache_alloc include/linux/pagemap.h:290 [inline]
 pagecache_get_page+0x669/0x950 mm/filemap.c:1848
 grab_cache_page_write_begin+0x5d/0xa0 mm/filemap.c:3456
 ext4_write_begin+0x29f/0x1730 fs/ext4/inode.c:1184
 ext4_da_write_begin+0x49d/0xf60 fs/ext4/inode.c:3021
 generic_perform_write+0x2cd/0x570 mm/filemap.c:3506
 ext4_buffered_write_iter+0x482/0x610 fs/ext4/file.c:271
 ext4_file_write_iter+0x193/0x1c80 fs/ext4/file.c:685
 call_write_iter include/linux/fs.h:1976 [inline]
 new_sync_write fs/read_write.c:518 [inline]
 vfs_write+0xb55/0xe70 fs/read_write.c:605
 ksys_write+0x199/0x2c0 fs/read_write.c:658
 __do_sys_write fs/read_write.c:670 [inline]
 __se_sys_write fs/read_write.c:667 [inline]
 __x64_sys_write+0x7b/0x90 fs/read_write.c:667
 do_syscall_64+0x34/0x70
 entry_SYSCALL_64_after_hwframe+0x61/0xc6
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:28 [inline]
 free_pages_prepare mm/page_alloc.c:1349 [inline]
 free_pcp_prepare mm/page_alloc.c:1421 [inline]
 free_unref_page_prepare+0x2ae/0x2d0 mm/page_alloc.c:3336
 free_unref_page_list+0x122/0xb20 mm/page_alloc.c:3443
 release_pages+0xea0/0xef0 mm/swap.c:1103
 __pagevec_release+0x84/0x100 mm/swap.c:1123
 pagevec_release include/linux/pagevec.h:88 [inline]
 truncate_inode_pages_range+0xa81/0x1ae0 mm/truncate.c:367
 truncate_inode_pages mm/truncate.c:473 [inline]
 truncate_inode_pages_final+0xc1/0xd0 mm/truncate.c:524
 ext4_evict_inode+0x3d7/0x1730 fs/ext4/inode.c:214
 evict+0x2a3/0x6c0 fs/inode.c:577
 dispose_list fs/inode.c:612 [inline]
 evict_inodes+0x5d1/0x650 fs/inode.c:662
 generic_shutdown_super+0x9c/0x2d0 fs/super.c:454
 kill_block_super+0x7e/0xe0 fs/super.c:1456
 deactivate_locked_super+0xad/0x110 fs/super.c:335
 deactivate_super+0xbe/0xf0 fs/super.c:366
 cleanup_mnt+0x45c/0x510 fs/namespace.c:1118
 __cleanup_mnt+0x19/0x20 fs/namespace.c:1125
 task_work_run+0x129/0x190 kernel/task_work.c:164

Memory state around the buggy address:
 ffff888124d8a680: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff888124d8a700: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff888124d8a780: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                   ^
 ffff888124d8a800: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff888124d8a880: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================
EXT4-fs error (device loop5): ext4_map_blocks:716: inode #19: block 5: comm kworker/u4:1: lblock 5 mapped to illegal pblock 5 (length 1)
EXT4-fs warning (device loop5): ext4_convert_unwritten_extents:4815: inode #19: block 5: len 1: ext4_ext_map_blocks returned -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 (loop5): failed to convert unwritten extents to written extents -- potential data loss!  (inode 19, error -117)
EXT4-fs warning (device loop5): ext4_convert_unwritten_extents:4815: inode #19: block 6: len 1: ext4_ext_map_blocks returned -117
EXT4-fs (loop5): failed to convert unwritten extents to written extents -- potential data loss!  (inode 19, error -117)
EXT4-fs warning (device loop5): ext4_convert_unwritten_extents:4815: inode #19: block 7: len 1: ext4_ext_map_blocks returned -117
EXT4-fs (loop5): failed to convert unwritten extents to written extents -- potential data loss!  (inode 19, error -117)
EXT4-fs warning (device loop5): ext4_convert_unwritten_extents:4815: inode #19: block 8: len 1: ext4_ext_map_blocks returned -117
EXT4-fs (loop5): failed to convert unwritten extents to written extents -- potential data loss!  (inode 19, error -117)
EXT4-fs warning (device loop5): ext4_convert_unwritten_extents:4815: inode #19: block 9: len 1: ext4_ext_map_blocks returned -117
EXT4-fs (loop5): failed to convert unwritten extents to written extents -- potential data loss!  (inode 19, error -117)
EXT4-fs warning (device loop5): ext4_convert_unwritten_extents:4815: inode #19: block 10: len 1: ext4_ext_map_blocks returned -117
EXT4-fs (loop5): failed to convert unwritten extents to written extents -- potential data loss!  (inode 19, error -117)
EXT4-fs warning (device loop5): ext4_convert_unwritten_extents:4815: inode #19: block 11: len 1: ext4_ext_map_blocks returned -117
EXT4-fs (loop5): failed to convert unwritten extents to written extents -- potential data loss!  (inode 19, error -117)
EXT4-fs warning (device loop5): ext4_convert_unwritten_extents:4815: inode #19: block 12: len 1: ext4_ext_map_blocks returned -117
EXT4-fs (loop5): failed to convert unwritten extents to written extents -- potential data loss!  (inode 19, error -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 loop3): __ext4_get_inode_loc:4426: comm kworker/u4:1: Invalid inode table block 34360905424 in block_group 0
EXT4-fs error (device loop1): ext4_find_extent:928: inode #19: comm kworker/u4:1: pblk 208 bad header/extent: invalid magic - magic 6f69, entries 29795, max 9324(0), depth 20297(0)
EXT4-fs warning (device loop1): ext4_convert_unwritten_extents:4815: inode #19: block 33: len 1: ext4_ext_map_blocks returned -117
EXT4-fs error (device loop1): __ext4_get_inode_loc:4426: comm kworker/u4:1: Invalid inode table block 34360905424 in block_group 0
EXT4-fs error (device loop1) in ext4_reserve_inode_write:5886: Corrupt filesystem
EXT4-fs error (device loop1): ext4_convert_unwritten_extents:4816: inode #19: comm kworker/u4:1: mark_inode_dirty error
EXT4-fs (loop1): 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 loop1): __ext4_get_inode_loc:4426: comm kworker/u4:1: Invalid inode table block 34360905424 in block_group 0
EXT4-fs error (device loop0): ext4_map_blocks:716: inode #19: block 194: comm kworker/u4:1: lblock 2 mapped to illegal pblock 194 (length 1)
EXT4-fs warning (device loop0): ext4_convert_unwritten_extents:4815: inode #19: block 2: 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 loop1): __ext4_get_inode_loc:4426: comm kworker/u4:1: Invalid inode table block 34360905424 in block_group 0
EXT4-fs error (device loop2): ext4_map_blocks:716: inode #19: block 195: comm kworker/u4:1: lblock 3 mapped to illegal pblock 195 (length 1)
EXT4-fs warning (device loop2): ext4_convert_unwritten_extents:4815: inode #19: block 3: len 1: ext4_ext_map_blocks returned -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 loop2) in ext4_reserve_inode_write:5886: Corrupt filesystem
EXT4-fs error (device loop2): ext4_convert_unwritten_extents:4816: inode #19: comm kworker/u4:1: mark_inode_dirty error
EXT4-fs (loop2): failed to convert unwritten extents to written extents -- potential data loss!  (inode 19, error -117)
EXT4-fs error (device loop2): ext4_find_extent:928: inode #19: comm kworker/u4:1: pblk 208 bad header/extent: invalid magic - magic 6f69, entries 29795, max 9324(0), depth 20297(0)
EXT4-fs warning (device loop2): ext4_convert_unwritten_extents:4815: inode #19: block 4: len 1: ext4_ext_map_blocks returned -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 loop2) in ext4_reserve_inode_write:5886: Corrupt filesystem
EXT4-fs error (device loop2): ext4_convert_unwritten_extents:4816: inode #19: comm kworker/u4:1: mark_inode_dirty error
EXT4-fs (loop2): failed to convert unwritten extents to written extents -- potential data loss!  (inode 19, error -117)
EXT4-fs error (device loop2): ext4_find_extent:928: inode #19: comm kworker/u4:1: pblk 208 bad header/extent: invalid magic - magic 6f69, entries 29795, max 9324(0), depth 20297(0)
EXT4-fs warning (device loop2): ext4_convert_unwritten_extents:4815: inode #19: block 5: len 1: ext4_ext_map_blocks returned -117
EXT4-fs (loop2): failed to convert unwritten extents to written extents -- potential data loss!  (inode 19, error -117)
EXT4-fs warning (device loop2): ext4_convert_unwritten_extents:4815: inode #19: block 6: len 1: ext4_ext_map_blocks returned -117
EXT4-fs (loop2): failed to convert unwritten extents to written extents -- potential data loss!  (inode 19, error -117)
EXT4-fs warning (device loop2): ext4_convert_unwritten_extents:4815: inode #19: block 7: len 1: ext4_ext_map_blocks returned -117
EXT4-fs (loop2): failed to convert unwritten extents to written extents -- potential data loss!  (inode 19, error -117)
EXT4-fs warning (device loop2): ext4_convert_unwritten_extents:4815: inode #19: block 8: len 1: ext4_ext_map_blocks returned -117
EXT4-fs (loop2): failed to convert unwritten extents to written extents -- potential data loss!  (inode 19, error -117)
EXT4-fs warning (device loop2): ext4_convert_unwritten_extents:4815: inode #19: block 9: len 1: ext4_ext_map_blocks returned -117
EXT4-fs (loop2): failed to convert unwritten extents to written extents -- potential data loss!  (inode 19, error -117)
EXT4-fs warning (device loop2): ext4_convert_unwritten_extents:4815: inode #19: block 10: len 1: ext4_ext_map_blocks returned -117
EXT4-fs (loop2): failed to convert unwritten extents to written extents -- potential data loss!  (inode 19, error -117)
EXT4-fs warning (device loop2): ext4_convert_unwritten_extents:4815: inode #19: block 11: len 1: ext4_ext_map_blocks returned -117
EXT4-fs warning (device loop2): ext4_convert_unwritten_extents:4815: inode #19: block 12: len 1: ext4_ext_map_blocks returned -117
EXT4-fs error (device loop1): ext4_map_blocks:716: inode #19: block 195: comm kworker/u4:1: lblock 3 mapped to illegal pblock 195 (length 1)
EXT4-fs warning (device loop1): ext4_convert_unwritten_extents:4815: inode #19: block 3: len 1: ext4_ext_map_blocks returned -117
EXT4-fs error (device loop1): __ext4_get_inode_loc:4426: comm kworker/u4:1: Invalid inode table block 34360905424 in block_group 0
EXT4-fs error (device loop1) in ext4_reserve_inode_write:5886: Corrupt filesystem
EXT4-fs error (device loop1): ext4_convert_unwritten_extents:4816: inode #19: comm kworker/u4:1: mark_inode_dirty error
EXT4-fs (loop1): failed to convert unwritten extents to written extents -- potential data loss!  (inode 19, error -117)
EXT4-fs error (device loop1): ext4_map_blocks:716: inode #19: block 196: comm kworker/u4:1: lblock 4 mapped to illegal pblock 196 (length 1)
EXT4-fs warning (device loop1): ext4_convert_unwritten_extents:4815: inode #19: block 4: len 1: ext4_ext_map_blocks returned -117
EXT4-fs error (device loop1): __ext4_get_inode_loc:4426: comm kworker/u4:1: Invalid inode table block 34360905424 in block_group 0
EXT4-fs error (device loop1) in ext4_reserve_inode_write:5886: Corrupt filesystem
EXT4-fs error (device loop1): ext4_convert_unwritten_extents:4816: inode #19: comm kworker/u4:1: mark_inode_dirty error
EXT4-fs (loop1): failed to convert unwritten extents to written extents -- potential data loss!  (inode 19, error -117)
EXT4-fs error (device loop1): ext4_find_extent:928: inode #19: comm kworker/u4:1: pblk 208 bad header/extent: invalid magic - magic 6f69, entries 29795, max 9324(0), depth 20297(0)
EXT4-fs warning (device loop1): ext4_convert_unwritten_extents:4815: inode #19: block 5: len 1: ext4_ext_map_blocks returned -117
EXT4-fs (loop1): failed to convert unwritten extents to written extents -- potential data loss!  (inode 19, error -117)
EXT4-fs warning (device loop1): ext4_convert_unwritten_extents:4815: inode #19: block 6: len 1: ext4_ext_map_blocks returned -117
EXT4-fs (loop1): failed to convert unwritten extents to written extents -- potential data loss!  (inode 19, error -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): __ext4_get_inode_loc:4426: comm kworker/u4:1: Invalid inode table block 34360905424 in block_group 0
EXT4-fs error (device loop3): __ext4_get_inode_loc:4426: comm kworker/u4:1: Invalid inode table block 34360905424 in block_group 0
EXT4-fs error (device loop1): __ext4_get_inode_loc:4426: comm kworker/u4:1: Invalid inode table block 34360905424 in block_group 0
EXT4-fs error (device loop1): __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 loop1): ext4_map_blocks:716: inode #19: block 196: comm kworker/u4:1: lblock 4 mapped to illegal pblock 196 (length 1)
EXT4-fs warning (device loop1): ext4_convert_unwritten_extents:4815: inode #19: block 4: len 1: ext4_ext_map_blocks returned -117
EXT4-fs error (device loop1): __ext4_get_inode_loc:4426: comm kworker/u4:1: Invalid inode table block 34360905424 in block_group 0
EXT4-fs error (device loop1) in ext4_reserve_inode_write:5886: Corrupt filesystem
EXT4-fs error (device loop1): ext4_convert_unwritten_extents:4816: inode #19: comm kworker/u4:1: mark_inode_dirty error
EXT4-fs (loop1): failed to convert unwritten extents to written extents -- potential data loss!  (inode 19, error -117)