EXT4-fs error (device loop1): ext4_get_group_desc:277: comm syz.1.43: block_group >= groups_count - block_group = 61055907, groups_count = 1
EXT4-fs error (device loop1): __ext4_get_inode_loc_noinmem:4557: inode #1953789044: comm syz.1.43: unable to read itable block
EXT4-fs error (device loop1): ext4_xattr_inode_iget:409: comm syz.1.43: error while reading EA inode 1953789044 err=-5
==================================================================
BUG: KASAN: use-after-free in ext4_xattr_inode_dec_ref_all+0xd04/0xfa0 fs/ext4/xattr.c:1134
Read of size 4 at addr ffff88812b35401c by task syz.1.43/639

CPU: 0 PID: 639 Comm: syz.1.43 Not tainted 5.10.236-syzkaller-1007360-gba8b8b193394 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
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_xattr_inode_dec_ref_all+0xd04/0xfa0 fs/ext4/xattr.c:1134
 ext4_xattr_release_block+0x4cf/0xa40 fs/ext4/xattr.c:1254
 ext4_xattr_delete_inode+0xaf9/0xc80 fs/ext4/xattr.c:2943
 ext4_evict_inode+0x1095/0x1730 fs/ext4/inode.c:300
 evict+0x526/0x9c0 fs/inode.c:612
 iput_final fs/inode.c:1736 [inline]
 iput+0x632/0x7e0 fs/inode.c:1762
 do_unlinkat+0x48e/0x8b0 fs/namei.c:4042
 __do_sys_unlinkat fs/namei.c:4077 [inline]
 __se_sys_unlinkat fs/namei.c:4070 [inline]
 __x64_sys_unlinkat+0xcd/0xf0 fs/namei.c:4070
 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7f9bcfa93169
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f9bcf505038 EFLAGS: 00000246 ORIG_RAX: 0000000000000107
RAX: ffffffffffffffda RBX: 00007f9bcfcabfa0 RCX: 00007f9bcfa93169
RDX: 0000000000000000 RSI: 0000200000000c40 RDI: ffffffffffffff9c
RBP: 00007f9bcfb142a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f9bcfcabfa0 R15: 00007ffcf0d32678

The buggy address belongs to the page:
page:ffffea0004acd500 refcount:0 mapcount:-128 mapping:0000000000000000 index:0x1 pfn:0x12b354
flags: 0x4000000000000000()
raw: 4000000000000000 ffffea0004acd788 ffffea0004acbf08 0000000000000000
raw: 0000000000000001 0000000000000001 00000000ffffff7f 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 0x100cca(GFP_HIGHUSER_MOVABLE), pid 609, ts 62298685980, free_ts 63093644246
 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:5349
 __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]
 wp_page_copy+0x226/0x1940 mm/memory.c:3171
 do_wp_page+0x71b/0xca0 mm/memory.c:-1
 handle_pte_fault+0xd31/0x3e10 mm/memory.c:4810
 __handle_mm_fault mm/memory.c:4944 [inline]
 handle_mm_fault+0x11d6/0x1a10 mm/memory.c:5358
 do_user_addr_fault arch/x86/mm/fault.c:1362 [inline]
 handle_page_fault arch/x86/mm/fault.c:1428 [inline]
 exc_page_fault+0x2a6/0x5b0 arch/x86/mm/fault.c:1484
 asm_exc_page_fault+0x1e/0x30 arch/x86/include/asm/idtentry.h:571
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
 free_pages_and_swap_cache+0x8a/0xa0 mm/swap_state.c:356
 tlb_batch_pages_flush mm/mmu_gather.c:49 [inline]
 tlb_flush_mmu_free mm/mmu_gather.c:240 [inline]
 tlb_flush_mmu mm/mmu_gather.c:247 [inline]
 tlb_finish_mmu+0x177/0x320 mm/mmu_gather.c:326
 exit_mmap+0x306/0x560 mm/mmap.c:3375
 __mmput+0x95/0x2d0 kernel/fork.c:1153
 mmput+0x59/0x170 kernel/fork.c:1176
 exit_mm kernel/exit.c:539 [inline]
 do_exit+0xbda/0x2a50 kernel/exit.c:850
 do_group_exit+0x141/0x310 kernel/exit.c:985
 __do_sys_exit_group kernel/exit.c:996 [inline]
 __se_sys_exit_group kernel/exit.c:994 [inline]
 __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:994
 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x61/0xcb

Memory state around the buggy address:
 ffff88812b353f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88812b353f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff88812b354000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                            ^
 ffff88812b354080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88812b354100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================
EXT4-fs warning (device loop1): ext4_evict_inode:303: xattr delete (err -117)