loop3: detected capacity change from 0 to 264192
==================================================================
BUG: KASAN: use-after-free in d_inode include/linux/dcache.h:515 [inline]
BUG: KASAN: use-after-free in relay_switch_subbuf+0x837/0x900 kernel/relay.c:676
Read of size 8 at addr ffff888011c85670 by task syz-executor.3/28026

CPU: 0 PID: 28026 Comm: syz-executor.3 Not tainted 6.0.0-syzkaller-09589-g55be6084c8e0 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
 print_address_description mm/kasan/report.c:317 [inline]
 print_report.cold+0x2ba/0x719 mm/kasan/report.c:433
 kasan_report+0xb1/0x1e0 mm/kasan/report.c:495
 d_inode include/linux/dcache.h:515 [inline]
 relay_switch_subbuf+0x837/0x900 kernel/relay.c:676
 relay_reserve include/linux/relay.h:248 [inline]
 trace_note+0x5af/0x720 kernel/trace/blktrace.c:95
 trace_note_tsk kernel/trace/blktrace.c:126 [inline]
 __blk_add_trace+0xbf8/0xde0 kernel/trace/blktrace.c:268
 blk_add_trace_bio+0x322/0x4d0 kernel/trace/blktrace.c:905
 trace_block_bio_queue include/trace/events/block.h:355 [inline]
 submit_bio_noacct+0x15b0/0x1d10 block/blk-core.c:785
 submit_bio block/blk-core.c:827 [inline]
 submit_bio+0x8b/0x1c0 block/blk-core.c:815
 submit_bh fs/buffer.c:2724 [inline]
 __bread_slow fs/buffer.c:1177 [inline]
 __bread_gfp+0x14b/0x320 fs/buffer.c:1381
 sb_bread include/linux/buffer_head.h:339 [inline]
 fat_fill_super+0x33e/0x3740 fs/fat/inode.c:1651
 mount_bdev+0x34d/0x410 fs/super.c:1400
 legacy_get_tree+0x105/0x220 fs/fs_context.c:610
 vfs_get_tree+0x89/0x2f0 fs/super.c:1530
 do_new_mount fs/namespace.c:3040 [inline]
 path_mount+0x1326/0x1e20 fs/namespace.c:3370
 do_mount fs/namespace.c:3383 [inline]
 __do_sys_mount fs/namespace.c:3591 [inline]
 __se_sys_mount fs/namespace.c:3568 [inline]
 __x64_sys_mount+0x27f/0x300 fs/namespace.c:3568
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f1b44a8cada
Code: 48 c7 c2 b8 ff ff ff f7 d8 64 89 02 b8 ff ff ff ff eb d2 e8 b8 04 00 00 0f 1f 84 00 00 00 00 00 49 89 ca b8 a5 00 00 00 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:00007f1b45cd9f88 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 0000000020000200 RCX: 00007f1b44a8cada
RDX: 0000000020000000 RSI: 00000000200000c0 RDI: 00007f1b45cd9fe0
RBP: 00007f1b45cda020 R08: 00007f1b45cda020 R09: 0000000020000000
R10: 0000000000000010 R11: 0000000000000202 R12: 0000000020000000
R13: 00000000200000c0 R14: 00007f1b45cd9fe0 R15: 0000000020000180
 </TASK>

Allocated by task 26860:
 kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38
 kasan_set_track mm/kasan/common.c:45 [inline]
 set_alloc_info mm/kasan/common.c:437 [inline]
 __kasan_slab_alloc+0x90/0xc0 mm/kasan/common.c:470
 kasan_slab_alloc include/linux/kasan.h:224 [inline]
 slab_post_alloc_hook mm/slab.h:727 [inline]
 slab_alloc_node mm/slub.c:3248 [inline]
 slab_alloc mm/slub.c:3256 [inline]
 __kmem_cache_alloc_lru mm/slub.c:3263 [inline]
 kmem_cache_alloc_lru+0x376/0x720 mm/slub.c:3280
 __d_alloc+0x32/0x980 fs/dcache.c:1769
 d_alloc+0x4a/0x230 fs/dcache.c:1849
 d_alloc_parallel+0xe4/0x1400 fs/dcache.c:2638
 __lookup_slow+0x193/0x460 fs/namei.c:1670
 lookup_one_len+0x16a/0x1a0 fs/namei.c:2711
 start_creating.part.0+0x135/0x280 fs/debugfs/inode.c:375
 start_creating fs/debugfs/inode.c:348 [inline]
 __debugfs_create_file+0xa9/0x540 fs/debugfs/inode.c:420
 relay_create_buf_file+0xf0/0x170 kernel/relay.c:363
 relay_open_buf.part.0+0x7bb/0xc00 kernel/relay.c:392
 relay_open_buf kernel/relay.c:384 [inline]
 relay_open kernel/relay.c:520 [inline]
 relay_open+0x57f/0xb30 kernel/relay.c:477
 do_blk_trace_setup+0x4bc/0xb60 kernel/trace/blktrace.c:560
 __blk_trace_setup+0xca/0x180 kernel/trace/blktrace.c:600
 blk_trace_ioctl+0x147/0x290 kernel/trace/blktrace.c:741
 blkdev_ioctl+0x181/0x800 block/ioctl.c:603
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:870 [inline]
 __se_sys_ioctl fs/ioctl.c:856 [inline]
 __x64_sys_ioctl+0x193/0x200 fs/ioctl.c:856
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

Last potentially related work creation:
 kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38
 __kasan_record_aux_stack+0xbe/0xd0 mm/kasan/generic.c:348
 call_rcu+0x99/0x790 kernel/rcu/tree.c:2796
 dentry_free+0xc3/0x160 fs/dcache.c:377
 __dentry_kill+0x4cb/0x640 fs/dcache.c:621
 dentry_kill fs/dcache.c:745 [inline]
 dput+0x64d/0xdb0 fs/dcache.c:913
 find_next_child fs/libfs.c:264 [inline]
 simple_recursive_removal+0x136/0x830 fs/libfs.c:279
 debugfs_remove fs/debugfs/inode.c:765 [inline]
 debugfs_remove+0x59/0x80 fs/debugfs/inode.c:759
 blk_unregister_queue+0x1a6/0x2a0 block/blk-sysfs.c:932
 del_gendisk+0x380/0xaf0 block/genhd.c:616
 loop_remove drivers/block/loop.c:2064 [inline]
 loop_control_remove drivers/block/loop.c:2119 [inline]
 loop_control_ioctl+0x44d/0x620 drivers/block/loop.c:2157
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:870 [inline]
 __se_sys_ioctl fs/ioctl.c:856 [inline]
 __x64_sys_ioctl+0x193/0x200 fs/ioctl.c:856
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

Second to last potentially related work creation:
 kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38
 __kasan_record_aux_stack+0xbe/0xd0 mm/kasan/generic.c:348
 call_rcu+0x99/0x790 kernel/rcu/tree.c:2796
 dentry_free+0xc3/0x160 fs/dcache.c:377
 __dentry_kill+0x4cb/0x640 fs/dcache.c:621
 dentry_kill fs/dcache.c:745 [inline]
 dput+0x64d/0xdb0 fs/dcache.c:913
 do_unlinkat+0x3dc/0x650 fs/namei.c:4300
 __do_sys_unlink fs/namei.c:4345 [inline]
 __se_sys_unlink fs/namei.c:4343 [inline]
 __x64_sys_unlink+0xc6/0x110 fs/namei.c:4343
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

The buggy address belongs to the object at ffff888011c85608
 which belongs to the cache dentry of size 312
The buggy address is located 104 bytes inside of
 312-byte region [ffff888011c85608, ffff888011c85740)

The buggy address belongs to the physical page:
page:ffffea0000472100 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888011c84eb0 pfn:0x11c84
head:ffffea0000472100 order:1 compound_mapcount:0 compound_pincount:0
memcg:ffff88805b876701
flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000010200 ffffea0001d74f08 ffffea0001fde808 ffff8880119db640
raw: ffff888011c84eb0 0000000000150011 00000001ffffffff ffff88805b876701
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 1, migratetype Reclaimable, gfp_mask 0xd20d0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_RECLAIMABLE), pid 2969, tgid 2969 (udevd), ts 11394691110, free_ts 0
 prep_new_page mm/page_alloc.c:2532 [inline]
 get_page_from_freelist+0x109b/0x2ce0 mm/page_alloc.c:4283
 __alloc_pages+0x1c7/0x510 mm/page_alloc.c:5549
 alloc_pages+0x1a6/0x270 mm/mempolicy.c:2270
 alloc_slab_page mm/slub.c:1829 [inline]
 allocate_slab+0x27e/0x3d0 mm/slub.c:1974
 new_slab mm/slub.c:2034 [inline]
 ___slab_alloc+0x84f/0xe80 mm/slub.c:3036
 __slab_alloc.constprop.0+0x4d/0xa0 mm/slub.c:3123
 slab_alloc_node mm/slub.c:3214 [inline]
 slab_alloc mm/slub.c:3256 [inline]
 __kmem_cache_alloc_lru mm/slub.c:3263 [inline]
 kmem_cache_alloc_lru+0x528/0x720 mm/slub.c:3280
 __d_alloc+0x32/0x980 fs/dcache.c:1769
 d_alloc+0x4a/0x230 fs/dcache.c:1849
 d_alloc_parallel+0xe4/0x1400 fs/dcache.c:2638
 lookup_open.isra.0+0x928/0x12a0 fs/namei.c:3338
 open_last_lookups fs/namei.c:3481 [inline]
 path_openat+0x996/0x28f0 fs/namei.c:3688
 do_filp_open+0x1b6/0x400 fs/namei.c:3718
 do_sys_openat2+0x16d/0x4c0 fs/open.c:1310
 do_sys_open fs/open.c:1326 [inline]
 __do_sys_openat fs/open.c:1342 [inline]
 __se_sys_openat fs/open.c:1337 [inline]
 __x64_sys_openat+0x13f/0x1f0 fs/open.c:1337
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
page_owner free stack trace missing

Memory state around the buggy address:
 ffff888011c85500: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff888011c85580: 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc
>ffff888011c85600: fc fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                                             ^
 ffff888011c85680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888011c85700: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
==================================================================