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BUG: KASAN: use-after-free in d_inode include/linux/dcache.h:520 [inline]
BUG: KASAN: use-after-free in relay_switch_subbuf+0x88b/0x8f0 kernel/relay.c:760
Read of size 8 at addr ffff88808d868238 by task syz-executor.5/19476

CPU: 1 PID: 19476 Comm: syz-executor.5 Not tainted 4.14.292-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2022
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x1b2/0x281 lib/dump_stack.c:58
 print_address_description.cold+0x54/0x1d3 mm/kasan/report.c:252
 kasan_report_error.cold+0x8a/0x191 mm/kasan/report.c:351
 kasan_report mm/kasan/report.c:409 [inline]
 __asan_report_load8_noabort+0x68/0x70 mm/kasan/report.c:430
 d_inode include/linux/dcache.h:520 [inline]
 relay_switch_subbuf+0x88b/0x8f0 kernel/relay.c:760
 relay_reserve include/linux/relay.h:261 [inline]
 trace_note+0x5bb/0x760 kernel/trace/blktrace.c:108
 trace_note_tsk kernel/trace/blktrace.c:139 [inline]
 __blk_add_trace+0xa70/0xd20 kernel/trace/blktrace.c:279
 blk_add_trace_rq+0x2af/0x380 kernel/trace/blktrace.c:870
 trace_block_rq_insert include/trace/events/block.h:192 [inline]
 blk_mq_sched_request_inserted+0x1b5/0x2d0 block/blk-mq-sched.c:259
 dd_insert_request block/mq-deadline.c:401 [inline]
 dd_insert_requests+0x25e/0x830 block/mq-deadline.c:437
 blk_mq_sched_insert_request+0x312/0x510 block/blk-mq-sched.c:378
 blk_execute_rq_nowait+0x15c/0x300 block/blk-exec.c:64
 sg_common_write.constprop.0+0xdfb/0x1e20 drivers/scsi/sg.c:843
 sg_new_write.isra.0+0x5be/0x8c0 drivers/scsi/sg.c:781
 sg_ioctl+0xfde/0x2500 drivers/scsi/sg.c:927
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:500 [inline]
 do_vfs_ioctl+0x75a/0xff0 fs/ioctl.c:684
 SYSC_ioctl fs/ioctl.c:701 [inline]
 SyS_ioctl+0x7f/0xb0 fs/ioctl.c:692
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x46/0xbb
RIP: 0033:0x7f23ab0423c9
RSP: 002b:00007f23a99b7168 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f23ab154f80 RCX: 00007f23ab0423c9
RDX: 0000000020002780 RSI: 0000000000002285 RDI: 0000000000000004
RBP: 00007f23ab09d33f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffed05f3e5f R14: 00007f23a99b7300 R15: 0000000000022000

Allocated by task 7988:
 save_stack mm/kasan/kasan.c:447 [inline]
 set_track mm/kasan/kasan.c:459 [inline]
 kasan_kmalloc+0xeb/0x160 mm/kasan/kasan.c:551
 kmem_cache_alloc+0x124/0x3c0 mm/slab.c:3552
 __d_alloc+0x2a/0xa20 fs/dcache.c:1623
 sock_alloc_file+0xc8/0x2e0 net/socket.c:409
 sock_map_fd net/socket.c:439 [inline]
 SYSC_socket net/socket.c:1349 [inline]
 SyS_socket+0x108/0x1b0 net/socket.c:1325
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x46/0xbb

Freed by task 7988:
 save_stack mm/kasan/kasan.c:447 [inline]
 set_track mm/kasan/kasan.c:459 [inline]
 kasan_slab_free+0xc3/0x1a0 mm/kasan/kasan.c:524
 __cache_free mm/slab.c:3496 [inline]
 kmem_cache_free+0x7c/0x2b0 mm/slab.c:3758
 __d_free fs/dcache.c:270 [inline]
 dentry_free+0xc6/0x120 fs/dcache.c:361
 __dentry_kill+0x3ff/0x550 fs/dcache.c:605
 dentry_kill fs/dcache.c:632 [inline]
 dput.part.0+0x56f/0x710 fs/dcache.c:847
 dput+0x1b/0x30 fs/dcache.c:811
 __fput+0x445/0x7a0 fs/file_table.c:228
 task_work_run+0x11f/0x190 kernel/task_work.c:113
 tracehook_notify_resume include/linux/tracehook.h:191 [inline]
 exit_to_usermode_loop+0x1ad/0x200 arch/x86/entry/common.c:164
 prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:270 [inline]
 do_syscall_64+0x4a3/0x640 arch/x86/entry/common.c:297
 entry_SYSCALL_64_after_hwframe+0x46/0xbb

The buggy address belongs to the object at ffff88808d8681e0
 which belongs to the cache dentry of size 288
The buggy address is located 88 bytes inside of
 288-byte region [ffff88808d8681e0, ffff88808d868300)
The buggy address belongs to the page:
page:ffffea0002361a00 count:1 mapcount:0 mapping:ffff88808d868080 index:0x0
flags: 0xfff00000000100(slab)
raw: 00fff00000000100 ffff88808d868080 0000000000000000 000000010000000b
raw: ffffea0002d62be0 ffffea0002366320 ffff8880b60c9200 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff88808d868100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88808d868180: fb fb fb fb fc fc fc fc fc fc fc fc fb fb fb fb
>ffff88808d868200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                        ^
 ffff88808d868280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88808d868300: fc fc fc fc fc fc fc fc 00 00 00 00 00 00 00 00
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