==================================================================
BUG: KASAN: use-after-free in ext4_xattr_delete_inode+0xc1f/0xc30 fs/ext4/xattr.c:2911
Read of size 4 at addr ffff8881e6eec000 by task syz-executor/1389

CPU: 1 PID: 1389 Comm: syz-executor Not tainted 5.4.274-syzkaller-00002-g6f97bd951d82 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1d8/0x241 lib/dump_stack.c:118
 print_address_description+0x8c/0x600 mm/kasan/report.c:384
 __kasan_report+0xf3/0x120 mm/kasan/report.c:516
 kasan_report+0x30/0x60 mm/kasan/common.c:653
 ext4_xattr_delete_inode+0xc1f/0xc30 fs/ext4/xattr.c:2911
 ext4_evict_inode+0x1378/0x1ac0 fs/ext4/inode.c:318
 evict+0x29b/0x6a0 fs/inode.c:575
 d_delete_notify include/linux/fsnotify.h:224 [inline]
 vfs_rmdir+0x24b/0x3c0 fs/namei.c:4040
 do_rmdir+0x2c1/0x580 fs/namei.c:4088
 do_syscall_64+0xca/0x1c0 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x5c/0xc1
RIP: 0033:0x7f28dd1791a7
Code: 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 07 01 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:00007fff599dad58 EFLAGS: 00000207 ORIG_RAX: 0000000000000107
RAX: ffffffffffffffda RBX: 0000000000000065 RCX: 00007f28dd1791a7
RDX: 0000000000000200 RSI: 00007fff599dbf00 RDI: 00000000ffffff9c
RBP: 00007f28dd1e764a R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000100 R11: 0000000000000207 R12: 00007fff599dbf00
R13: 00007f28dd1e764a R14: 0000000000010740 R15: 00007fff599de0e0

Allocated by task 414:
 save_stack mm/kasan/common.c:70 [inline]
 set_track mm/kasan/common.c:78 [inline]
 __kasan_kmalloc+0x171/0x210 mm/kasan/common.c:529
 slab_post_alloc_hook mm/slab.h:584 [inline]
 slab_alloc_node mm/slub.c:2829 [inline]
 slab_alloc mm/slub.c:2837 [inline]
 kmem_cache_alloc+0xd9/0x250 mm/slub.c:2842
 __sigqueue_alloc+0x19b/0x2e0 kernel/signal.c:435
 __send_signal+0x1ee/0xbe0 kernel/signal.c:1116
 do_send_sig_info+0xe0/0x130 kernel/signal.c:1291
 ____bpf_send_signal kernel/trace/bpf_trace.c:677 [inline]
 bpf_send_signal+0x2a8/0x3b0 kernel/trace/bpf_trace.c:637
 bpf_prog_a1d19f868c11d610+0x11f/0x1000
 bpf_call_func include/linux/filter.h:627 [inline]
 __bpf_trace_run kernel/trace/bpf_trace.c:1341 [inline]
 bpf_trace_run2+0x101/0x2d0 kernel/trace/bpf_trace.c:1379
 trace_sys_exit include/trace/events/syscalls.h:44 [inline]
 syscall_slow_exit_work+0x370/0x400 arch/x86/entry/common.c:234
 syscall_return_slowpath arch/x86/entry/common.c:271 [inline]
 do_syscall_64+0x19d/0x1c0 arch/x86/entry/common.c:300
 entry_SYSCALL_64_after_hwframe+0x5c/0xc1

Freed by task 414:
 save_stack mm/kasan/common.c:70 [inline]
 set_track mm/kasan/common.c:78 [inline]
 kasan_set_free_info mm/kasan/common.c:345 [inline]
 __kasan_slab_free+0x1b5/0x270 mm/kasan/common.c:487
 slab_free_hook mm/slub.c:1455 [inline]
 slab_free_freelist_hook mm/slub.c:1494 [inline]
 slab_free mm/slub.c:3080 [inline]
 kmem_cache_free+0x10b/0x2c0 mm/slub.c:3096
 __sigqueue_free kernel/signal.c:458 [inline]
 collect_signal kernel/signal.c:597 [inline]
 __dequeue_signal+0x54f/0x630 kernel/signal.c:619
 dequeue_signal+0x10c/0x520 kernel/signal.c:639
 signalfd_dequeue fs/signalfd.c:163 [inline]
 signalfd_read+0x3a9/0x1330 fs/signalfd.c:217
 __vfs_read+0x103/0x730 fs/read_write.c:425
 vfs_read+0x148/0x360 fs/read_write.c:461
 ksys_read+0x199/0x2c0 fs/read_write.c:587
 do_syscall_64+0xca/0x1c0 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x5c/0xc1

The buggy address belongs to the object at ffff8881e6eec000
 which belongs to the cache sigqueue of size 80
The buggy address is located 0 bytes inside of
 80-byte region [ffff8881e6eec000, ffff8881e6eec050)
The buggy address belongs to the page:
page:ffffea00079bbb00 refcount:1 mapcount:0 mapping:ffff8881f5d07900 index:0x0
flags: 0x8000000000000200(slab)
raw: 8000000000000200 dead000000000100 dead000000000122 ffff8881f5d07900
raw: 0000000000000000 0000000000240024 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 0x112a20(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_HARDWALL)
 set_page_owner include/linux/page_owner.h:31 [inline]
 post_alloc_hook mm/page_alloc.c:2165 [inline]
 prep_new_page+0x18f/0x370 mm/page_alloc.c:2171
 get_page_from_freelist+0x2d13/0x2d90 mm/page_alloc.c:3794
 __alloc_pages_nodemask+0x393/0x840 mm/page_alloc.c:4893
 alloc_slab_page+0x39/0x3c0 mm/slub.c:343
 allocate_slab mm/slub.c:1683 [inline]
 new_slab+0x97/0x440 mm/slub.c:1749
 new_slab_objects mm/slub.c:2505 [inline]
 ___slab_alloc+0x2fe/0x490 mm/slub.c:2667
 __slab_alloc+0x62/0xa0 mm/slub.c:2707
 slab_alloc_node mm/slub.c:2792 [inline]
 slab_alloc mm/slub.c:2837 [inline]
 kmem_cache_alloc+0x109/0x250 mm/slub.c:2842
 __sigqueue_alloc+0x19b/0x2e0 kernel/signal.c:435
 __send_signal+0x1ee/0xbe0 kernel/signal.c:1116
 do_send_sig_info+0xe0/0x130 kernel/signal.c:1291
 ____bpf_send_signal kernel/trace/bpf_trace.c:677 [inline]
 bpf_send_signal+0x2a8/0x3b0 kernel/trace/bpf_trace.c:637
 bpf_prog_a1d19f868c11d610+0x11f/0x1000
 bpf_call_func include/linux/filter.h:627 [inline]
 __bpf_trace_run kernel/trace/bpf_trace.c:1341 [inline]
 bpf_trace_run2+0x101/0x2d0 kernel/trace/bpf_trace.c:1379
 trace_sys_exit include/trace/events/syscalls.h:44 [inline]
 syscall_slow_exit_work+0x370/0x400 arch/x86/entry/common.c:234
 syscall_return_slowpath arch/x86/entry/common.c:271 [inline]
 do_syscall_64+0x19d/0x1c0 arch/x86/entry/common.c:300
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1176 [inline]
 free_pcp_prepare mm/page_alloc.c:1233 [inline]
 free_unref_page_prepare+0x297/0x380 mm/page_alloc.c:3085
 free_unref_page mm/page_alloc.c:3134 [inline]
 free_the_page mm/page_alloc.c:4953 [inline]
 __free_pages+0xaf/0x140 mm/page_alloc.c:4961
 __free_slab+0x221/0x2e0 mm/slub.c:1774
 __slab_free+0x34b/0x360 mm/slub.c:3012
 qlist_free_all+0x43/0xb0 mm/kasan/quarantine.c:167
 quarantine_reduce+0x1d9/0x210 mm/kasan/quarantine.c:260
 __kasan_kmalloc+0x41/0x210 mm/kasan/common.c:507
 slab_post_alloc_hook mm/slab.h:584 [inline]
 slab_alloc_node mm/slub.c:2829 [inline]
 slab_alloc mm/slub.c:2837 [inline]
 kmem_cache_alloc+0xd9/0x250 mm/slub.c:2842
 getname_flags+0xb8/0x4e0 fs/namei.c:141
 do_sys_open+0x357/0x810 fs/open.c:1117
 do_syscall_64+0xca/0x1c0 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x5c/0xc1

Memory state around the buggy address:
 ffff8881e6eebf00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8881e6eebf80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff8881e6eec000: fb fb fb fb fb fb fb fb fb fb fc fc fc fc fb fb
                   ^
 ffff8881e6eec080: fb fb fb fb fb fb fb fb fc fc fc fc fb fb fb fb
 ffff8881e6eec100: fb fb fb fb fb fb fc fc fc fc fb fb fb fb fb fb
==================================================================