==================================================================
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 ffff888123c7b9c4 by task kworker/u4:4/423

CPU: 1 PID: 423 Comm: kworker/u4:4 Not tainted 5.10.227-syzkaller-1004002-g550d1177dc67 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
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+0xbea/0xe30 fs/ext4/extents.c:945
 ext4_ext_map_blocks+0x26a/0x6ee0 fs/ext4/extents.c:4159
 ext4_map_blocks+0xa65/0x1d10 fs/ext4/inode.c:673
 ext4_convert_unwritten_extents+0x2a3/0x5a0 fs/ext4/extents.c:4860
 ext4_convert_unwritten_io_end_vec+0x104/0x180 fs/ext4/extents.c:4899
 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:298

The buggy address belongs to the page:
page:ffffea00048f1ec0 refcount:1 mapcount:0 mapping:ffff888113c6f850 index:0xf7 pfn:0x123c7b
aops:shmem_aops ino:409 dentry name:"memfd:syzkaller"
flags: 0x400000000008001e(referenced|uptodate|dirty|lru|swapbacked)
raw: 400000000008001e ffffea00048f57c8 ffffea00048f1f08 ffff888113c6f850
raw: 00000000000000f7 0000000000000000 00000001ffffffff ffff88810cbae000
page dumped because: kasan: bad access detected
page->mem_cgroup:ffff88810cbae000
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Movable, gfp_mask 0x100cca(GFP_HIGHUSER_MOVABLE), pid 434, ts 49831999735, free_ts 49701353895
 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:5348
 __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]
 shmem_alloc_page+0x257/0x420 mm/shmem.c:1580
 shmem_alloc_and_acct_page+0x395/0x8e0 mm/shmem.c:1605
 shmem_getpage_gfp+0x891/0x2480 mm/shmem.c:1918
 shmem_getpage mm/shmem.c:161 [inline]
 shmem_write_begin+0xca/0x1b0 mm/shmem.c:2500
 generic_perform_write+0x2cd/0x570 mm/filemap.c:3509
 __generic_file_write_iter+0x23c/0x560 mm/filemap.c:3638
 generic_file_write_iter+0xaf/0x1c0 mm/filemap.c:3670
 call_write_iter include/linux/fs.h:2023 [inline]
 new_sync_write fs/read_write.c:518 [inline]
 vfs_write+0xb4c/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+0x61/0xcb
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+0x7e/0x1c0 mm/page_alloc.c:3391
 __put_single_page mm/swap.c:104 [inline]
 __put_page+0xb1/0xe0 mm/swap.c:135
 put_page include/linux/mm.h:1257 [inline]
 ext4_write_begin+0x12c6/0x1730 fs/ext4/inode.c:1289
 ext4_da_write_begin+0x49d/0xf60 fs/ext4/inode.c:3032
 generic_perform_write+0x2cd/0x570 mm/filemap.c:3509
 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:2023 [inline]
 new_sync_write fs/read_write.c:518 [inline]
 vfs_write+0xb4c/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+0x61/0xcb

Memory state around the buggy address:
 ffff888123c7b880: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff888123c7b900: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff888123c7b980: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
                                           ^
 ffff888123c7ba00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff888123c7ba80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================
EXT4-fs error (device loop5): ext4_map_blocks:739: inode #19: block 4: comm kworker/u4:4: lblock 4 mapped to illegal pblock 4 (length 1)
EXT4-fs warning (device loop5): ext4_convert_unwritten_extents:4867: inode #19: block 4: len 1: ext4_ext_map_blocks returned -117
EXT4-fs error (device loop5): __ext4_get_inode_loc:4437: comm kworker/u4:4: Invalid inode table block 34360905424 in block_group 0
EXT4-fs error (device loop5) in ext4_reserve_inode_write:5900: Corrupt filesystem
EXT4-fs error (device loop5): ext4_convert_unwritten_extents:4868: inode #19: comm kworker/u4:4: mark_inode_dirty error
EXT4-fs (loop5): failed to convert unwritten extents to written extents -- potential data loss!  (inode 19, error -117)
EXT4-fs error (device loop5): ext4_map_blocks:739: inode #19: block 5: comm kworker/u4:4: lblock 5 mapped to illegal pblock 5 (length 1)
EXT4-fs warning (device loop5): ext4_convert_unwritten_extents:4867: inode #19: block 5: 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:4867: 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:4867: 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 error (device loop3): ext4_map_blocks:739: inode #19: block 205: comm kworker/u4:4: lblock 13 mapped to illegal pblock 205 (length 1)
EXT4-fs warning (device loop3): ext4_convert_unwritten_extents:4867: inode #19: block 13: len 1: ext4_ext_map_blocks returned -117
EXT4-fs error (device loop3): __ext4_get_inode_loc:4437: comm kworker/u4:4: Invalid inode table block 34360905424 in block_group 0
EXT4-fs error (device loop3) in ext4_reserve_inode_write:5900: Corrupt filesystem
EXT4-fs error (device loop3): ext4_convert_unwritten_extents:4868: inode #19: comm kworker/u4:4: mark_inode_dirty error
EXT4-fs (loop3): failed to convert unwritten extents to written extents -- potential data loss!  (inode 19, error -117)
EXT4-fs error (device loop3): ext4_find_extent:928: inode #19: comm kworker/u4:4: pblk 208 bad header/extent: invalid magic - magic 6f69, entries 29795, max 9324(0), depth 20297(0)
EXT4-fs warning (device loop3): ext4_convert_unwritten_extents:4867: inode #19: block 14: len 1: ext4_ext_map_blocks returned -117
EXT4-fs error (device loop3): __ext4_get_inode_loc:4437: comm kworker/u4:4: Invalid inode table block 34360905424 in block_group 0
EXT4-fs error (device loop3) in ext4_reserve_inode_write:5900: Corrupt filesystem
EXT4-fs error (device loop3): ext4_convert_unwritten_extents:4868: inode #19: comm kworker/u4:4: mark_inode_dirty error
EXT4-fs (loop3): failed to convert unwritten extents to written extents -- potential data loss!  (inode 19, error -117)
EXT4-fs error (device loop3): ext4_find_extent:928: inode #19: comm kworker/u4:4: pblk 208 bad header/extent: invalid magic - magic 6f69, entries 29795, max 9324(0), depth 20297(0)
EXT4-fs warning (device loop3): ext4_convert_unwritten_extents:4867: inode #19: block 15: len 1: ext4_ext_map_blocks returned -117
EXT4-fs (loop3): failed to convert unwritten extents to written extents -- potential data loss!  (inode 19, error -117)
EXT4-fs warning (device loop3): ext4_convert_unwritten_extents:4867: inode #19: block 16: len 1: ext4_ext_map_blocks returned -117
EXT4-fs (loop3): failed to convert unwritten extents to written extents -- potential data loss!  (inode 19, error -117)
EXT4-fs error (device loop4): __ext4_get_inode_loc:4437: comm kworker/u4:4: Invalid inode table block 34360905424 in block_group 0
EXT4-fs error (device loop4): __ext4_get_inode_loc:4437: comm kworker/u4:4: Invalid inode table block 34360905424 in block_group 0
EXT4-fs error (device loop3): ext4_map_blocks:739: inode #19: block 201: comm kworker/u4:4: lblock 9 mapped to illegal pblock 201 (length 1)
EXT4-fs warning (device loop3): ext4_convert_unwritten_extents:4867: inode #19: block 9: len 1: ext4_ext_map_blocks returned -117
EXT4-fs error (device loop3): __ext4_get_inode_loc:4437: comm kworker/u4:4: Invalid inode table block 34360905424 in block_group 0
EXT4-fs error (device loop3) in ext4_reserve_inode_write:5900: Corrupt filesystem
EXT4-fs error (device loop3): ext4_convert_unwritten_extents:4868: inode #19: comm kworker/u4:4: mark_inode_dirty error
EXT4-fs (loop3): failed to convert unwritten extents to written extents -- potential data loss!  (inode 19, error -117)
EXT4-fs error (device loop3): ext4_find_extent:928: inode #19: comm kworker/u4:4: pblk 208 bad header/extent: invalid magic - magic 6f69, entries 29795, max 9324(0), depth 20297(0)
EXT4-fs warning (device loop3): ext4_convert_unwritten_extents:4867: inode #19: block 10: len 1: ext4_ext_map_blocks returned -117
EXT4-fs error (device loop3): __ext4_get_inode_loc:4437: comm kworker/u4:4: Invalid inode table block 34360905424 in block_group 0
EXT4-fs error (device loop3) in ext4_reserve_inode_write:5900: Corrupt filesystem
EXT4-fs error (device loop3): ext4_convert_unwritten_extents:4868: inode #19: comm kworker/u4:4: mark_inode_dirty error
EXT4-fs (loop3): failed to convert unwritten extents to written extents -- potential data loss!  (inode 19, error -117)
EXT4-fs error (device loop5): ext4_map_blocks:739: inode #19: block 203: comm kworker/u4:4: lblock 11 mapped to illegal pblock 203 (length 1)
EXT4-fs warning (device loop5): ext4_convert_unwritten_extents:4867: inode #19: block 11: len 1: ext4_ext_map_blocks returned -117
EXT4-fs error (device loop5): __ext4_get_inode_loc:4437: comm kworker/u4:4: Invalid inode table block 34360905424 in block_group 0
EXT4-fs error (device loop5) in ext4_reserve_inode_write:5900: Corrupt filesystem
EXT4-fs error (device loop5): ext4_convert_unwritten_extents:4868: inode #19: comm kworker/u4:4: mark_inode_dirty error
EXT4-fs (loop5): failed to convert unwritten extents to written extents -- potential data loss!  (inode 19, error -117)
EXT4-fs error (device loop2): __ext4_get_inode_loc:4437: comm kworker/u4:4: Invalid inode table block 34360905424 in block_group 0
EXT4-fs error (device loop2): __ext4_get_inode_loc:4437: comm kworker/u4:4: Invalid inode table block 34360905424 in block_group 0
EXT4-fs error (device loop4): ext4_map_blocks:739: inode #19: block 202: comm kworker/u4:4: lblock 10 mapped to illegal pblock 202 (length 1)
EXT4-fs warning (device loop4): ext4_convert_unwritten_extents:4867: inode #19: block 10: len 1: ext4_ext_map_blocks returned -117
EXT4-fs error (device loop4): __ext4_get_inode_loc:4437: comm kworker/u4:4: Invalid inode table block 34360905424 in block_group 0
EXT4-fs error (device loop4) in ext4_reserve_inode_write:5900: Corrupt filesystem
EXT4-fs error (device loop4): ext4_convert_unwritten_extents:4868: inode #19: comm kworker/u4:4: 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_get_inode_loc:4437: comm kworker/u4:4: Invalid inode table block 34360905424 in block_group 0
EXT4-fs error (device loop4): __ext4_get_inode_loc:4437: comm kworker/u4:4: Invalid inode table block 34360905424 in block_group 0
EXT4-fs error (device loop1): ext4_find_extent:928: inode #19: comm kworker/u4:4: 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:4867: inode #19: block 16: len 1: ext4_ext_map_blocks returned -117
EXT4-fs error (device loop1): __ext4_get_inode_loc:4437: comm kworker/u4:4: Invalid inode table block 34360905424 in block_group 0
EXT4-fs error (device loop1) in ext4_reserve_inode_write:5900: Corrupt filesystem
EXT4-fs error (device loop1): ext4_convert_unwritten_extents:4868: inode #19: comm kworker/u4:4: 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/u4:4: 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:4867: inode #19: block 17: len 1: ext4_ext_map_blocks returned -117
EXT4-fs error (device loop1): __ext4_get_inode_loc:4437: comm kworker/u4:4: Invalid inode table block 34360905424 in block_group 0
EXT4-fs error (device loop1) in ext4_reserve_inode_write:5900: Corrupt filesystem
EXT4-fs error (device loop1): ext4_convert_unwritten_extents:4868: inode #19: comm kworker/u4:4: 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 loop3): __ext4_get_inode_loc:4437: comm kworker/u4:4: Invalid inode table block 34360905424 in block_group 0
EXT4-fs error (device loop3): __ext4_get_inode_loc:4437: comm kworker/u4:4: Invalid inode table block 34360905424 in block_group 0
EXT4-fs error (device loop4): ext4_map_blocks:739: inode #19: block 199: comm kworker/u4:4: lblock 7 mapped to illegal pblock 199 (length 1)
EXT4-fs warning (device loop4): ext4_convert_unwritten_extents:4867: inode #19: block 7: len 1: ext4_ext_map_blocks returned -117
EXT4-fs error (device loop4): __ext4_get_inode_loc:4437: comm kworker/u4:4: Invalid inode table block 34360905424 in block_group 0
EXT4-fs error (device loop4) in ext4_reserve_inode_write:5900: Corrupt filesystem
EXT4-fs error (device loop4): ext4_convert_unwritten_extents:4868: inode #19: comm kworker/u4:4: 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_find_extent:928: inode #19: comm kworker/u4:4: pblk 208 bad header/extent: invalid magic - magic 6f69, entries 29795, max 9324(0), depth 20297(0)
EXT4-fs warning (device loop4): ext4_convert_unwritten_extents:4867: inode #19: block 8: len 1: ext4_ext_map_blocks returned -117
EXT4-fs error (device loop4): __ext4_get_inode_loc:4437: comm kworker/u4:4: Invalid inode table block 34360905424 in block_group 0
EXT4-fs error (device loop4) in ext4_reserve_inode_write:5900: Corrupt filesystem
EXT4-fs error (device loop4): ext4_convert_unwritten_extents:4868: inode #19: comm kworker/u4:4: 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_find_extent:928: inode #19: comm kworker/u4:4: pblk 208 bad header/extent: invalid magic - magic 6f69, entries 29795, max 9324(0), depth 20297(0)
EXT4-fs warning (device loop4): ext4_convert_unwritten_extents:4867: inode #19: block 9: len 1: ext4_ext_map_blocks returned -117
EXT4-fs error (device loop4): __ext4_get_inode_loc:4437: comm kworker/u4:4: Invalid inode table block 34360905424 in block_group 0
EXT4-fs (loop4): failed to convert unwritten extents to written extents -- potential data loss!  (inode 19, error -117)
EXT4-fs warning (device loop4): ext4_convert_unwritten_extents:4867: inode #19: block 10: 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 warning (device loop4): ext4_convert_unwritten_extents:4867: inode #19: block 11: 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 warning (device loop4): ext4_convert_unwritten_extents:4867: inode #19: block 12: 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 warning (device loop4): ext4_convert_unwritten_extents:4867: inode #19: block 13: 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 warning (device loop4): ext4_convert_unwritten_extents:4867: inode #19: block 14: 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 warning (device loop4): ext4_convert_unwritten_extents:4867: inode #19: block 15: 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 warning (device loop4): ext4_convert_unwritten_extents:4867: inode #19: block 16: 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)