==================================================================
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 ffff88801cea4938 by task ksoftirqd/0/17

CPU: 0 PID: 17 Comm: ksoftirqd/0 Not tainted 6.0.0-rc7-syzkaller-00132-g987a926c1d8a #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014
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/0x6e9 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_rq+0x384/0x480 kernel/trace/blktrace.c:846
 trace_block_rq_complete include/trace/events/block.h:147 [inline]
 blk_update_request+0x91f/0x1300 block/blk-mq.c:795
 blk_mq_end_request+0x4b/0x80 block/blk-mq.c:951
 lo_complete_rq+0x1c2/0x280 drivers/block/loop.c:370
 blk_complete_reqs+0xad/0xe0 block/blk-mq.c:1022
 __do_softirq+0x1d3/0x9c6 kernel/softirq.c:571
 run_ksoftirqd kernel/softirq.c:934 [inline]
 run_ksoftirqd+0x2d/0x60 kernel/softirq.c:926
 smpboot_thread_fn+0x645/0x9c0 kernel/smpboot.c:164
 kthread+0x2e4/0x3a0 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306
 </TASK>

Allocated by task 9993:
 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+0x85/0xb0 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 mm/slab.c:3294 [inline]
 __kmem_cache_alloc_lru mm/slab.c:3471 [inline]
 kmem_cache_alloc_lru+0x2a3/0x860 mm/slab.c:3498
 __d_alloc+0x32/0x960 fs/dcache.c:1769
 d_alloc_anon fs/dcache.c:1868 [inline]
 d_alloc_cursor+0x3b/0xd0 fs/dcache.c:1874
 dcache_dir_open+0x33/0x90 fs/libfs.c:82
 do_dentry_open+0x4a4/0x13a0 fs/open.c:880
 do_open fs/namei.c:3557 [inline]
 path_openat+0x1c92/0x28f0 fs/namei.c:3691
 do_filp_open+0x1b6/0x400 fs/namei.c:3718
 do_sys_openat2+0x16d/0x4c0 fs/open.c:1313
 do_sys_open fs/open.c:1329 [inline]
 __do_sys_openat fs/open.c:1345 [inline]
 __se_sys_openat fs/open.c:1340 [inline]
 __x64_sys_openat+0x13f/0x1f0 fs/open.c:1340
 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+0x7e/0x90 mm/kasan/generic.c:348
 call_rcu+0x99/0x790 kernel/rcu/tree.c:2793
 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
 dcache_dir_close+0x33/0x40 fs/libfs.c:90
 __fput+0x277/0x9d0 fs/file_table.c:320
 task_work_run+0xdd/0x1a0 kernel/task_work.c:177
 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:169 [inline]
 exit_to_user_mode_prepare+0x23c/0x250 kernel/entry/common.c:201
 __syscall_exit_to_user_mode_work kernel/entry/common.c:283 [inline]
 syscall_exit_to_user_mode+0x19/0x50 kernel/entry/common.c:294
 do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86
 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+0x7e/0x90 mm/kasan/generic.c:348
 call_rcu+0x99/0x790 kernel/rcu/tree.c:2793
 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
 handle_mounts fs/namei.c:1548 [inline]
 step_into+0x10bb/0x20d0 fs/namei.c:1831
 walk_component+0xf5/0x5a0 fs/namei.c:1999
 lookup_last fs/namei.c:2450 [inline]
 path_lookupat+0x1ba/0x840 fs/namei.c:2474
 filename_lookup+0x1ce/0x590 fs/namei.c:2503
 vfs_statx+0x148/0x390 fs/stat.c:228
 vfs_fstatat+0x8c/0xb0 fs/stat.c:255
 __do_sys_newfstatat+0x91/0x110 fs/stat.c:425
 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 ffff88801cea48d0
 which belongs to the cache dentry of size 312
The buggy address is located 104 bytes inside of
 312-byte region [ffff88801cea48d0, ffff88801cea4a08)

The buggy address belongs to the physical page:
page:ffffea000073a900 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88801cea4178 pfn:0x1cea4
memcg:ffff888015518401
flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000200 ffffea0000a215c8 ffffea0000a226c8 ffff8880121e1300
raw: ffff88801cea4178 ffff88801cea4000 0000000100000001 ffff888015518401
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Reclaimable, gfp_mask 0x2420d0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_COMP|__GFP_THISNODE|__GFP_RECLAIMABLE), pid 1701, tgid 1701 (kworker/u17:1), ts 20086086586, 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_node include/linux/gfp.h:243 [inline]
 kmem_getpages mm/slab.c:1363 [inline]
 cache_grow_begin+0x75/0x360 mm/slab.c:2569
 cache_alloc_refill+0x27f/0x380 mm/slab.c:2942
 ____cache_alloc mm/slab.c:3018 [inline]
 ____cache_alloc mm/slab.c:3001 [inline]
 __do_cache_alloc mm/slab.c:3246 [inline]
 slab_alloc mm/slab.c:3287 [inline]
 __kmem_cache_alloc_lru mm/slab.c:3471 [inline]
 kmem_cache_alloc_lru+0x727/0x860 mm/slab.c:3498
 __d_alloc+0x32/0x960 fs/dcache.c:1769
 d_alloc+0x4a/0x230 fs/dcache.c:1849
 d_alloc_parallel+0xe4/0x1400 fs/dcache.c:2647
 __lookup_slow+0x193/0x460 fs/namei.c:1670
 lookup_slow fs/namei.c:1702 [inline]
 walk_component+0x33f/0x5a0 fs/namei.c:1993
 link_path_walk.part.0+0x74e/0xe20 fs/namei.c:2320
 link_path_walk fs/namei.c:2245 [inline]
 path_openat+0x262/0x28f0 fs/namei.c:3687
 do_filp_open+0x1b6/0x400 fs/namei.c:3718
 do_open_execat+0x116/0x730 fs/exec.c:918
 bprm_execve fs/exec.c:1812 [inline]
 bprm_execve+0x48c/0x1960 fs/exec.c:1799
 kernel_execve+0x3ea/0x500 fs/exec.c:2002
page_owner free stack trace missing

Memory state around the buggy address:
 ffff88801cea4800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88801cea4880: fb fb fc fc fc fc fc fc fc fc fb fb fb fb fb fb
>ffff88801cea4900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                        ^
 ffff88801cea4980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88801cea4a00: fb fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb
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