==================================================================
BUG: KASAN: use-after-free in __lock_acquire+0x3f13/0x57d0 kernel/locking/lockdep.c:4702
Read of size 8 at addr ffff8880103528a8 by task syz-executor320/6675

CPU: 0 PID: 6675 Comm: syz-executor320 Not tainted 5.11.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:79 [inline]
 dump_stack+0x9a/0xcc lib/dump_stack.c:120
 print_address_description.constprop.0.cold+0x5b/0x2f8 mm/kasan/report.c:230
 __kasan_report mm/kasan/report.c:396 [inline]
 kasan_report.cold+0x79/0xd5 mm/kasan/report.c:413
 __lock_acquire+0x3f13/0x57d0 kernel/locking/lockdep.c:4702
 lock_acquire kernel/locking/lockdep.c:5442 [inline]
 lock_acquire+0x1a8/0x720 kernel/locking/lockdep.c:5407
 __raw_spin_lock_irq include/linux/spinlock_api_smp.h:128 [inline]
 _raw_spin_lock_irq+0x32/0x50 kernel/locking/spinlock.c:167
 spin_lock_irq include/linux/spinlock.h:379 [inline]
 post_one_notification.isra.0+0x4f/0x790 kernel/watch_queue.c:85
 __post_watch_notification kernel/watch_queue.c:205 [inline]
 __post_watch_notification+0x441/0x7b0 kernel/watch_queue.c:175
 post_watch_notification include/linux/watch_queue.h:108 [inline]
 notify_key security/keys/internal.h:199 [inline]
 __key_update security/keys/key.c:773 [inline]
 key_create_or_update+0xa99/0xc00 security/keys/key.c:977
 __do_sys_add_key+0x156/0x300 security/keys/keyctl.c:134
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x7f3ef6189a79
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 11 15 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:00007f3ef613b2f8 EFLAGS: 00000246 ORIG_RAX: 00000000000000f8
RAX: ffffffffffffffda RBX: 00007f3ef6211428 RCX: 00007f3ef6189a79
RDX: 00000000200000c0 RSI: 0000000020000080 RDI: 0000000020000040
RBP: 0000000000000000 R08: 00000000fffffffc R09: 0000000000000000
R10: 0000000000000048 R11: 0000000000000246 R12: 00007f3ef6211420
R13: 00007f3ef621142c R14: 00007f3ef61df064 R15: 3a74707972637366

Allocated by task 6672:
 kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38
 kasan_set_track mm/kasan/common.c:46 [inline]
 set_alloc_info mm/kasan/common.c:401 [inline]
 ____kasan_kmalloc.constprop.0+0x82/0xa0 mm/kasan/common.c:429
 kmalloc include/linux/slab.h:552 [inline]
 kzalloc include/linux/slab.h:682 [inline]
 alloc_pipe_info+0xd5/0x490 fs/pipe.c:774
 get_pipe_inode fs/pipe.c:863 [inline]
 create_pipe_files+0x85/0x890 fs/pipe.c:895
 __do_pipe_flags fs/pipe.c:944 [inline]
 do_pipe2+0x78/0x150 fs/pipe.c:992
 __do_sys_pipe2 fs/pipe.c:1010 [inline]
 __se_sys_pipe2 fs/pipe.c:1008 [inline]
 __x64_sys_pipe2+0x4b/0x70 fs/pipe.c:1008
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Freed by task 6673:
 kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38
 kasan_set_track+0x1c/0x30 mm/kasan/common.c:46
 kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:356
 ____kasan_slab_free+0xe1/0x110 mm/kasan/common.c:362
 kasan_slab_free include/linux/kasan.h:192 [inline]
 slab_free_hook mm/slub.c:1547 [inline]
 slab_free_freelist_hook+0x5d/0x150 mm/slub.c:1580
 slab_free mm/slub.c:3143 [inline]
 kfree+0xdb/0x3b0 mm/slub.c:4139
 put_pipe_info fs/pipe.c:695 [inline]
 pipe_release+0x220/0x270 fs/pipe.c:718
 __fput+0x204/0x870 fs/file_table.c:280
 task_work_run+0xc0/0x160 kernel/task_work.c:140
 tracehook_notify_resume include/linux/tracehook.h:189 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:174 [inline]
 exit_to_user_mode_prepare+0x249/0x250 kernel/entry/common.c:201
 __syscall_exit_to_user_mode_work kernel/entry/common.c:283 [inline]
 syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

The buggy address belongs to the object at ffff888010352800
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 168 bytes inside of
 512-byte region [ffff888010352800, ffff888010352a00)
The buggy address belongs to the page:
page:00000000a4e0b759 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10350
head:00000000a4e0b759 order:2 compound_mapcount:0 compound_pincount:0
flags: 0xfff00000010200(slab|head)
raw: 00fff00000010200 dead000000000100 dead000000000122 ffff88800f441280
raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 2, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 4808, ts 10534307860
 set_page_owner include/linux/page_owner.h:31 [inline]
 post_alloc_hook+0x144/0x1c0 mm/page_alloc.c:2297
 prep_new_page mm/page_alloc.c:2306 [inline]
 get_page_from_freelist+0x1c6e/0x3f80 mm/page_alloc.c:3945
 __alloc_pages_nodemask+0x2d6/0x730 mm/page_alloc.c:4995
 alloc_pages include/linux/gfp.h:547 [inline]
 alloc_slab_page mm/slub.c:1618 [inline]
 allocate_slab+0x2b6/0x4a0 mm/slub.c:1758
 new_slab mm/slub.c:1821 [inline]
 new_slab_objects mm/slub.c:2578 [inline]
 ___slab_alloc+0x476/0x790 mm/slub.c:2741
 __slab_alloc.constprop.0+0x95/0xe0 mm/slub.c:2781
 slab_alloc_node mm/slub.c:2857 [inline]
 slab_alloc mm/slub.c:2900 [inline]
 kmem_cache_alloc_trace+0x2cc/0x360 mm/slub.c:2917
 kmalloc include/linux/slab.h:552 [inline]
 kzalloc include/linux/slab.h:682 [inline]
 ep_alloc.constprop.0+0xcc/0x310 fs/eventpoll.c:931
 do_epoll_create+0x7d/0x160 fs/eventpoll.c:1965
 __do_sys_epoll_create1 fs/eventpoll.c:1996 [inline]
 __se_sys_epoll_create1 fs/eventpoll.c:1994 [inline]
 __x64_sys_epoll_create1+0x28/0x40 fs/eventpoll.c:1994
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1271 [inline]
 __free_pages_ok+0x4da/0xed0 mm/page_alloc.c:1536
 unfreeze_partials+0x16c/0x1b0 mm/slub.c:2359
 put_cpu_partial+0x129/0x200 mm/slub.c:2395
 qlink_free mm/kasan/quarantine.c:146 [inline]
 qlist_free_all+0x5a/0xc0 mm/kasan/quarantine.c:165
 quarantine_reduce+0x180/0x200 mm/kasan/quarantine.c:272
 ____kasan_kmalloc.constprop.0+0x98/0xa0 mm/kasan/common.c:412
 kmalloc include/linux/slab.h:557 [inline]
 tomoyo_realpath_from_path+0xb0/0x6a0 security/tomoyo/realpath.c:254
 tomoyo_get_realpath security/tomoyo/file.c:151 [inline]
 tomoyo_check_open_permission+0x21c/0x2c0 security/tomoyo/file.c:771
 security_file_open+0x43/0x400 security/security.c:1576
 do_dentry_open+0x30d/0xfb0 fs/open.c:804
 do_open fs/namei.c:3254 [inline]
 path_openat+0x129c/0x2190 fs/namei.c:3371
 do_filp_open+0x16d/0x390 fs/namei.c:3398
 do_sys_openat2+0x11e/0x360 fs/open.c:1172
 do_sys_open fs/open.c:1188 [inline]
 __do_sys_openat fs/open.c:1204 [inline]
 __se_sys_openat fs/open.c:1199 [inline]
 __x64_sys_openat+0x11b/0x1d0 fs/open.c:1199
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Memory state around the buggy address:
 ffff888010352780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff888010352800: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff888010352880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                  ^
 ffff888010352900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888010352980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================