==================================================================
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 ffff88812240aa58 by task kworker/u4:5/420

CPU: 0 PID: 420 Comm: kworker/u4:5 Not tainted 5.10.214-syzkaller-1001996-ga8e7f812fbc1 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024
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+0x26a/0x6ee0 fs/ext4/extents.c:4137
 ext4_map_blocks+0xa65/0x1d10 fs/ext4/inode.c:644
 ext4_convert_unwritten_extents+0x2a3/0x5a0 fs/ext4/extents.c:4838
 ext4_convert_unwritten_io_end_vec+0x104/0x180 fs/ext4/extents.c:4877
 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

Allocated by task 382:
 kasan_save_stack mm/kasan/common.c:38 [inline]
 kasan_set_track mm/kasan/common.c:45 [inline]
 set_alloc_info mm/kasan/common.c:430 [inline]
 __kasan_slab_alloc+0xb1/0xe0 mm/kasan/common.c:463
 kasan_slab_alloc include/linux/kasan.h:244 [inline]
 slab_post_alloc_hook+0x61/0x2f0 mm/slab.h:583
 slab_alloc_node mm/slub.c:2947 [inline]
 slab_alloc mm/slub.c:2955 [inline]
 kmem_cache_alloc+0x168/0x2e0 mm/slub.c:2960
 getname_flags+0xba/0x520 fs/namei.c:141
 user_path_at_empty+0x2d/0x50 fs/namei.c:2740
 user_path_at include/linux/namei.h:60 [inline]
 vfs_statx+0x106/0x3b0 fs/stat.c:193
 vfs_fstatat fs/stat.c:215 [inline]
 __do_sys_newfstatat fs/stat.c:383 [inline]
 __se_sys_newfstatat+0xc8/0x760 fs/stat.c:377
 __x64_sys_newfstatat+0x9b/0xb0 fs/stat.c:377
 do_syscall_64+0x34/0x70
 entry_SYSCALL_64_after_hwframe+0x61/0xc6

Freed by task 382:
 kasan_save_stack mm/kasan/common.c:38 [inline]
 kasan_set_track+0x4b/0x70 mm/kasan/common.c:45
 kasan_set_free_info+0x23/0x40 mm/kasan/generic.c:370
 ____kasan_slab_free+0x121/0x160 mm/kasan/common.c:362
 __kasan_slab_free+0x11/0x20 mm/kasan/common.c:370
 kasan_slab_free include/linux/kasan.h:220 [inline]
 slab_free_hook mm/slub.c:1595 [inline]
 slab_free_freelist_hook+0xc0/0x190 mm/slub.c:1621
 slab_free mm/slub.c:3203 [inline]
 kmem_cache_free+0xa9/0x1e0 mm/slub.c:3219
 putname fs/namei.c:262 [inline]
 filename_lookup+0x515/0x6f0 fs/namei.c:2470
 user_path_at_empty+0x40/0x50 fs/namei.c:2740
 user_path_at include/linux/namei.h:60 [inline]
 vfs_statx+0x106/0x3b0 fs/stat.c:193
 vfs_fstatat fs/stat.c:215 [inline]
 __do_sys_newfstatat fs/stat.c:383 [inline]
 __se_sys_newfstatat+0xc8/0x760 fs/stat.c:377
 __x64_sys_newfstatat+0x9b/0xb0 fs/stat.c:377
 do_syscall_64+0x34/0x70
 entry_SYSCALL_64_after_hwframe+0x61/0xc6

The buggy address belongs to the object at ffff88812240a200
 which belongs to the cache names_cache of size 4096
The buggy address is located 2136 bytes inside of
 4096-byte region [ffff88812240a200, ffff88812240b200)
The buggy address belongs to the page:
page:ffffea0004890200 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x122408
head:ffffea0004890200 order:3 compound_mapcount:0 compound_pincount:0
flags: 0x4000000000010200(slab|head)
raw: 4000000000010200 dead000000000100 dead000000000122 ffff888100192d80
raw: 0000000000000000 0000000000070007 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, migratetype Unmovable, gfp_mask 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 382, ts 43202767269, free_ts 0
 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
 allocate_slab mm/slub.c:1808 [inline]
 new_slab+0x80/0x400 mm/slub.c:1869
 new_slab_objects mm/slub.c:2627 [inline]
 ___slab_alloc+0x302/0x4b0 mm/slub.c:2791
 __slab_alloc+0x63/0xa0 mm/slub.c:2831
 slab_alloc_node mm/slub.c:2913 [inline]
 slab_alloc mm/slub.c:2955 [inline]
 kmem_cache_alloc+0x1b9/0x2e0 mm/slub.c:2960
 getname_flags+0xba/0x520 fs/namei.c:141
 user_path_at_empty+0x2d/0x50 fs/namei.c:2740
 user_path_at include/linux/namei.h:60 [inline]
 vfs_statx+0x106/0x3b0 fs/stat.c:193
 vfs_fstatat fs/stat.c:215 [inline]
 __do_sys_newfstatat fs/stat.c:383 [inline]
 __se_sys_newfstatat+0xc8/0x760 fs/stat.c:377
 __x64_sys_newfstatat+0x9b/0xb0 fs/stat.c:377
 do_syscall_64+0x34/0x70
 entry_SYSCALL_64_after_hwframe+0x61/0xc6
page_owner free stack trace missing

Memory state around the buggy address:
 ffff88812240a900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88812240a980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88812240aa00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                                    ^
 ffff88812240aa80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88812240ab00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
EXT4-fs error (device loop4): ext4_map_blocks:710: inode #19: block 23: comm kworker/u4:5: lblock 23 mapped to illegal pblock 23 (length 1)
EXT4-fs warning (device loop4): ext4_convert_unwritten_extents:4845: inode #19: block 23: len 1: ext4_ext_map_blocks returned -117
EXT4-fs error (device loop4): __ext4_get_inode_loc:4409: comm kworker/u4:5: Invalid inode table block 34360905424 in block_group 0
EXT4-fs error (device loop4) in ext4_reserve_inode_write:5869: Corrupt filesystem
EXT4-fs error (device loop4): ext4_convert_unwritten_extents:4846: inode #19: comm kworker/u4:5: 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:4409: comm kworker/u4:5: Invalid inode table block 34360905424 in block_group 0
EXT4-fs error (device loop4): __ext4_get_inode_loc:4409: comm kworker/u4:5: Invalid inode table block 34360905424 in block_group 0
EXT4-fs error (device loop5): __ext4_get_inode_loc:4409: comm kworker/u4:5: Invalid inode table block 34360905424 in block_group 0
EXT4-fs error (device loop4): __ext4_get_inode_loc:4409: comm kworker/u4:5: Invalid inode table block 34360905424 in block_group 0
EXT4-fs error (device loop3): __ext4_get_inode_loc:4409: comm kworker/u4:5: Invalid inode table block 34360905424 in block_group 0
EXT4-fs error (device loop3): __ext4_get_inode_loc:4409: comm kworker/u4:5: Invalid inode table block 34360905424 in block_group 0
EXT4-fs error (device loop4): ext4_map_blocks:710: inode #19: block 199: comm kworker/u4:5: lblock 7 mapped to illegal pblock 199 (length 1)
EXT4-fs warning (device loop4): ext4_convert_unwritten_extents:4845: inode #19: block 7: len 1: ext4_ext_map_blocks returned -117
EXT4-fs error (device loop4): __ext4_get_inode_loc:4409: comm kworker/u4:5: Invalid inode table block 34360905424 in block_group 0
EXT4-fs error (device loop4) in ext4_reserve_inode_write:5869: Corrupt filesystem
EXT4-fs error (device loop4): ext4_convert_unwritten_extents:4846: inode #19: comm kworker/u4:5: 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/u4:5: 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:4845: inode #19: block 8: len 1: ext4_ext_map_blocks returned -117
EXT4-fs error (device loop4): __ext4_get_inode_loc:4409: comm kworker/u4:5: Invalid inode table block 34360905424 in block_group 0
EXT4-fs error (device loop4) in ext4_reserve_inode_write:5869: Corrupt filesystem
EXT4-fs error (device loop4): ext4_convert_unwritten_extents:4846: inode #19: comm kworker/u4:5: 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/u4:5: 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:4845: inode #19: block 9: 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 loop1): ext4_map_blocks:710: inode #19: block 247: comm kworker/u4:5: lblock 39 mapped to illegal pblock 247 (length 1)
EXT4-fs warning (device loop1): ext4_convert_unwritten_extents:4845: inode #19: block 39: len 1: ext4_ext_map_blocks returned -117
EXT4-fs error (device loop1): __ext4_get_inode_loc:4409: comm kworker/u4:5: Invalid inode table block 34360905424 in block_group 0
EXT4-fs error (device loop1) in ext4_reserve_inode_write:5869: Corrupt filesystem
EXT4-fs error (device loop1): ext4_convert_unwritten_extents:4846: inode #19: comm kworker/u4:5: 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:4409: comm kworker/u4:5: Invalid inode table block 34360905424 in block_group 0
EXT4-fs error (device loop3): __ext4_get_inode_loc:4409: comm kworker/u4:5: Invalid inode table block 34360905424 in block_group 0
EXT4-fs error (device loop5): __ext4_get_inode_loc:4409: comm kworker/u4:5: Invalid inode table block 34360905424 in block_group 0
EXT4-fs error (device loop0): ext4_map_blocks:710: inode #19: block 204: comm kworker/u4:5: lblock 12 mapped to illegal pblock 204 (length 1)
EXT4-fs warning (device loop0): ext4_convert_unwritten_extents:4845: inode #19: block 12: len 1: ext4_ext_map_blocks returned -117
EXT4-fs error (device loop0): __ext4_get_inode_loc:4409: comm kworker/u4:5: Invalid inode table block 34360905424 in block_group 0
EXT4-fs error (device loop0) in ext4_reserve_inode_write:5869: Corrupt filesystem
EXT4-fs error (device loop0): ext4_convert_unwritten_extents:4846: inode #19: comm kworker/u4:5: 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 loop3): __ext4_get_inode_loc:4409: comm kworker/u4:5: Invalid inode table block 34360905424 in block_group 0
EXT4-fs error (device loop2): __ext4_get_inode_loc:4409: comm kworker/u4:5: Invalid inode table block 34360905424 in block_group 0
EXT4-fs error (device loop4): __ext4_get_inode_loc:4409: comm kworker/u4:5: Invalid inode table block 34360905424 in block_group 0
EXT4-fs error (device loop4): __ext4_get_inode_loc:4409: comm kworker/u4:5: Invalid inode table block 34360905424 in block_group 0
EXT4-fs error (device loop5): __ext4_get_inode_loc:4409: comm kworker/u4:5: Invalid inode table block 34360905424 in block_group 0
EXT4-fs error (device loop5): __ext4_get_inode_loc:4409: comm kworker/u4:5: Invalid inode table block 34360905424 in block_group 0
EXT4-fs warning (device loop1): ext4_convert_unwritten_extents:4845: inode #19: block 47: 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:4409: comm kworker/u4:5: Invalid inode table block 34360905424 in block_group 0
EXT4-fs error (device loop0): __ext4_get_inode_loc:4409: comm kworker/u4:5: Invalid inode table block 34360905424 in block_group 0
EXT4-fs error (device loop1): ext4_map_blocks:710: inode #19: block 32: comm kworker/u4:5: lblock 32 mapped to illegal pblock 32 (length 1)
EXT4-fs warning (device loop1): ext4_convert_unwritten_extents:4845: inode #19: block 32: len 1: ext4_ext_map_blocks returned -117
EXT4-fs error (device loop1): __ext4_get_inode_loc:4409: comm kworker/u4:5: Invalid inode table block 34360905424 in block_group 0
EXT4-fs error (device loop1) in ext4_reserve_inode_write:5869: Corrupt filesystem