EXT4-fs error (device loop5): ext4_xattr_inode_iget:409: comm syz.5.83: error while reading EA inode 2818987279 err=-117
==================================================================
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 ffff888125ac6030 by task syz.5.83/868

CPU: 1 PID: 868 Comm: syz.5.83 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_delete_inode+0xaa6/0xc80 fs/ext4/xattr.c:2901
 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
 ext4_orphan_cleanup+0x9ac/0xd50 fs/ext4/super.c:3121
 ext4_fill_super+0x888c/0x9150 fs/ext4/super.c:5075
 mount_bdev+0x262/0x370 fs/super.c:1442
 ext4_mount+0x34/0x40 fs/ext4/super.c:6645
 legacy_get_tree+0xf1/0x190 fs/fs_context.c:593
 vfs_get_tree+0x88/0x290 fs/super.c:1572
 do_new_mount+0x2ba/0xb30 fs/namespace.c:2917
 path_mount+0x56f/0xcb0 fs/namespace.c:3247
 do_mount fs/namespace.c:3260 [inline]
 __do_sys_mount fs/namespace.c:3468 [inline]
 __se_sys_mount+0x2c4/0x3b0 fs/namespace.c:3445
 __x64_sys_mount+0xbf/0xd0 fs/namespace.c:3445
 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7f8c5116190a
Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 1a 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 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:00007f8c50bd1e68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f8c50bd1ef0 RCX: 00007f8c5116190a
RDX: 0000200000000180 RSI: 00002000000001c0 RDI: 00007f8c50bd1eb0
RBP: 0000200000000180 R08: 00007f8c50bd1ef0 R09: 0000000000800700
R10: 0000000000800700 R11: 0000000000000246 R12: 00002000000001c0
R13: 00007f8c50bd1eb0 R14: 0000000000000455 R15: 00002000000002c0

Allocated by task 868:
 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
 mempool_alloc_slab+0x1d/0x30 mm/mempool.c:513
 mempool_alloc+0x11f/0x530 mm/mempool.c:393
 bio_alloc_bioset+0x1e0/0x650 block/bio.c:486
 bio_alloc include/linux/bio.h:412 [inline]
 submit_bh_wbc+0x1d1/0x700 fs/buffer.c:3057
 submit_bh+0x28/0x40 fs/buffer.c:3091
 __ext4_read_bh fs/ext4/super.c:157 [inline]
 ext4_read_bh_nowait+0x167/0x1f0 fs/ext4/super.c:169
 ext4_sb_breadahead_unmovable+0xc6/0xe0 fs/ext4/super.c:244
 __ext4_get_inode_loc+0x9f1/0xbf0 fs/ext4/inode.c:4521
 __ext4_get_inode_loc_noinmem fs/ext4/inode.c:4552 [inline]
 __ext4_iget+0x516/0x41f0 fs/ext4/inode.c:4777
 ext4_fill_super+0x734e/0x9150 fs/ext4/super.c:4955
 mount_bdev+0x262/0x370 fs/super.c:1442
 ext4_mount+0x34/0x40 fs/ext4/super.c:6645
 legacy_get_tree+0xf1/0x190 fs/fs_context.c:593
 vfs_get_tree+0x88/0x290 fs/super.c:1572
 do_new_mount+0x2ba/0xb30 fs/namespace.c:2917
 path_mount+0x56f/0xcb0 fs/namespace.c:3247
 do_mount fs/namespace.c:3260 [inline]
 __do_sys_mount fs/namespace.c:3468 [inline]
 __se_sys_mount+0x2c4/0x3b0 fs/namespace.c:3445
 __x64_sys_mount+0xbf/0xd0 fs/namespace.c:3445
 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x61/0xcb

Freed by task 19:
 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
 mempool_free_slab+0x1d/0x30 mm/mempool.c:520
 mempool_free+0xd7/0x310 mm/mempool.c:502
 bio_free+0x157/0x1a0 block/bio.c:266
 bio_put+0xca/0x120 block/bio.c:-1
 end_bio_bh_io_sync+0xbf/0x110 fs/buffer.c:3037
 bio_endio+0x520/0x6a0 block/bio.c:1458
 req_bio_endio block/blk-core.c:263 [inline]
 blk_update_request+0x6e9/0x12b0 block/blk-core.c:1468
 blk_mq_end_request+0x43/0x80 block/blk-mq.c:569
 lo_complete_rq+0x154/0x2f0 drivers/block/loop.c:490
 blk_done_softirq+0x345/0x3d0 block/blk-mq.c:593
 __do_softirq+0x268/0x5bb kernel/softirq.c:309

The buggy address belongs to the object at ffff888125ac6000
 which belongs to the cache bio-0 of size 216
The buggy address is located 48 bytes inside of
 216-byte region [ffff888125ac6000, ffff888125ac60d8)
The buggy address belongs to the page:
page:ffffea000496b180 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x125ac6
flags: 0x4000000000000200(slab)
raw: 4000000000000200 dead000000000100 dead000000000122 ffff888107fdc000
raw: 0000000000000000 00000000000c000c 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x192800(GFP_NOWAIT|__GFP_NOWARN|__GFP_NORETRY|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 868, ts 65063576183, free_ts 65062500390
 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_slab_page mm/slub.c:-1 [inline]
 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
 mempool_alloc_slab+0x1d/0x30 mm/mempool.c:513
 mempool_alloc+0x11f/0x530 mm/mempool.c:393
 bio_alloc_bioset+0x1e0/0x650 block/bio.c:486
 bio_alloc include/linux/bio.h:412 [inline]
 submit_bh_wbc+0x1d1/0x700 fs/buffer.c:3057
 submit_bh+0x28/0x40 fs/buffer.c:3091
 __ext4_read_bh fs/ext4/super.c:157 [inline]
 ext4_read_bh_nowait+0x167/0x1f0 fs/ext4/super.c:169
 ext4_sb_breadahead_unmovable+0xc6/0xe0 fs/ext4/super.c:244
 __ext4_get_inode_loc+0x9f1/0xbf0 fs/ext4/inode.c:4521
 __ext4_get_inode_loc_noinmem fs/ext4/inode.c:4552 [inline]
 __ext4_iget+0x516/0x41f0 fs/ext4/inode.c:4777
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 mm/page_alloc.c:3391 [inline]
 free_the_page+0x9e/0x370 mm/page_alloc.c:5408
 __free_pages+0x67/0xc0 mm/page_alloc.c:5419
 __vunmap+0x7c1/0x940 mm/vmalloc.c:2301
 free_work+0x5b/0x80 mm/vmalloc.c:69
 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

Memory state around the buggy address:
 ffff888125ac5f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff888125ac5f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff888125ac6000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                     ^
 ffff888125ac6080: fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc fc
 ffff888125ac6100: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb
==================================================================
EXT4-fs (loop5): 1 orphan inode deleted
EXT4-fs (loop5): mounted filesystem without journal. Opts: usrjquota=,journal_dev=0x0000000000008000,dioread_lock,minixdf,resgid=0x0000000000000000,grpquota,stripe=0x0000000000000000,journal_dev=0x0000000000000dcc,,errors=continue