EXT4-fs error (device loop1): ext4_ext_remove_space:2942: inode #19: comm syz-executor.1: pblk 0 bad header/extent: invalid extent entries - magic f30a, entries 1, max 4(4), depth 1(1)
EXT4-fs error (device loop1): ext4_ext_remove_space:2942: inode #19: comm syz-executor.1: pblk 0 bad header/extent: invalid extent entries - magic f30a, entries 1, max 4(4), depth 1(1)
EXT4-fs error (device loop1): ext4_ext_remove_space:2942: inode #19: comm syz-executor.1: pblk 0 bad header/extent: invalid extent entries - magic f30a, entries 1, max 4(4), depth 1(1)
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BUG: KASAN: use-after-free in ext4_ext_binsearch fs/ext4/extents.c:826 [inline]
BUG: KASAN: use-after-free in ext4_find_extent+0xba3/0xd80 fs/ext4/extents.c:945
Read of size 4 at addr ffff88817c5c6088 by task syz-executor.1/6219

CPU: 0 PID: 6219 Comm: syz-executor.1 Tainted: G        W         5.10.161-syzkaller-00019-g416c4356f372 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/30/2023
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack_lvl+0x1e2/0x24b lib/dump_stack.c:118
 print_address_description+0x81/0x3c0 mm/kasan/report.c:233
 __kasan_report mm/kasan/report.c:419 [inline]
 kasan_report+0x1a4/0x1f0 mm/kasan/report.c:436
 __asan_report_load4_noabort+0x14/0x20 mm/kasan/report_generic.c:308
 ext4_ext_binsearch fs/ext4/extents.c:826 [inline]
 ext4_find_extent+0xba3/0xd80 fs/ext4/extents.c:945
 ext4_ext_map_blocks+0x219/0x3a30 fs/ext4/extents.c:4097
 ext4_map_blocks+0x42a/0x1ee0 fs/ext4/inode.c:563
 _ext4_get_block+0x21e/0x610 fs/ext4/inode.c:795
 ext4_get_block_unwritten+0x2a/0x40 fs/ext4/inode.c:826
 ext4_block_write_begin+0x5f1/0x1350 fs/ext4/inode.c:1079
 ext4_write_begin+0x70e/0x16f0 fs/ext4/ext4_jbd2.h:506
 ext4_da_write_begin+0x4a8/0xf10 fs/ext4/inode.c:3022
 generic_perform_write+0x309/0x5b0 mm/filemap.c:3468
 ext4_buffered_write_iter+0x47c/0x610 fs/ext4/file.c:272
 ext4_file_write_iter+0x192/0x1c70 fs/ext4/file.c:689
 call_write_iter include/linux/fs.h:1969 [inline]
 new_sync_write fs/read_write.c:518 [inline]
 vfs_write+0xc4a/0xf80 fs/read_write.c:605
 ksys_write+0x198/0x2c0 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 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x61/0xc6
RIP: 0033:0x7f9382632169
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f93813a5168 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f9382751f80 RCX: 00007f9382632169
RDX: 000000000208e24b RSI: 0000000020000000 RDI: 0000000000000006
RBP: 00007f938268dca1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fff10d5e5bf R14: 00007f93813a5300 R15: 0000000000022000

The buggy address belongs to the page:
page:ffffea0005f17180 refcount:0 mapcount:0 mapping:0000000000000000 index:0x1 pfn:0x17c5c6
flags: 0x8000000000000000()
raw: 8000000000000000 dead000000000100 dead000000000122 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 0x1101cca(GFP_HIGHUSER_MOVABLE|__GFP_WRITE), pid 20121, ts 1820561163816, free_ts 1822544954594
 set_page_owner include/linux/page_owner.h:35 [inline]
 post_alloc_hook mm/page_alloc.c:2386 [inline]
 prep_new_page mm/page_alloc.c:2392 [inline]
 get_page_from_freelist+0x755/0x810 mm/page_alloc.c:4073
 __alloc_pages_nodemask+0x3b6/0x890 mm/page_alloc.c:5160
 __alloc_pages include/linux/gfp.h:529 [inline]
 __alloc_pages_node include/linux/gfp.h:542 [inline]
 alloc_pages_node include/linux/gfp.h:556 [inline]
 alloc_pages include/linux/gfp.h:575 [inline]
 __page_cache_alloc include/linux/pagemap.h:290 [inline]
 pagecache_get_page+0x567/0x850 mm/filemap.c:1848
 grab_cache_page_write_begin+0x5c/0xa0 mm/filemap.c:3418
 ext4_write_begin+0x2a5/0x16f0 fs/ext4/inode.c:1186
 ext4_da_write_begin+0x4a8/0xf10 fs/ext4/inode.c:3022
 generic_perform_write+0x309/0x5b0 mm/filemap.c:3468
 ext4_buffered_write_iter+0x47c/0x610 fs/ext4/file.c:272
 ext4_file_write_iter+0x192/0x1c70 fs/ext4/file.c:689
 __kernel_write+0x5ad/0x9d0 fs/read_write.c:550
 dump_emit fs/coredump.c:849 [inline]
 dump_user_range+0x25b/0x3b0 fs/coredump.c:902
 elf_core_dump+0x3156/0x3cd0 fs/binfmt_elf.c:2287
 do_coredump+0x1f7c/0x2dc0 fs/coredump.c:811
 get_signal+0xdde/0x1440 kernel/signal.c:2774
 arch_do_signal+0x8e/0x650 arch/x86/kernel/signal.c:805
 exit_to_user_mode_loop+0xa3/0xe0 kernel/entry/common.c:161
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:28 [inline]
 free_pages_prepare mm/page_alloc.c:1332 [inline]
 free_pcp_prepare+0x18c/0x1c0 mm/page_alloc.c:1406
 free_unref_page_prepare mm/page_alloc.c:3293 [inline]
 free_unref_page_list+0x11d/0x660 mm/page_alloc.c:3367
 release_pages+0xc24/0xc60 mm/swap.c:1082
 __pagevec_release+0x81/0xf0 mm/swap.c:1102
 pagevec_release include/linux/pagevec.h:88 [inline]
 truncate_inode_pages_range+0x9f8/0x1940 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+0x41f/0x1730 fs/ext4/inode.c:223
 evict+0x2a3/0x6c0 fs/inode.c:577
 iput_final fs/inode.c:1655 [inline]
 iput+0x61f/0x7d0 fs/inode.c:1681
 dentry_unlink_inode+0x2df/0x3d0 fs/dcache.c:374
 __dentry_kill+0x3e2/0x5d0 fs/dcache.c:579
 dentry_kill+0xc0/0x2a0 fs/dcache.c:692
 dput+0x175/0x320 fs/dcache.c:878
 __fput+0x540/0x7c0 fs/file_table.c:294
 ____fput+0x15/0x20 fs/file_table.c:314
 task_work_run+0x147/0x1b0 kernel/task_work.c:154

Memory state around the buggy address:
 ffff88817c5c5f80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88817c5c6000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff88817c5c6080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                      ^
 ffff88817c5c6100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88817c5c6180: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
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