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BUG: KASAN: use-after-free in list_empty include/linux/list.h:282 [inline]
BUG: KASAN: use-after-free in waitqueue_active include/linux/wait.h:127 [inline]
BUG: KASAN: use-after-free in wq_has_sleeper include/linux/wait.h:161 [inline]
BUG: KASAN: use-after-free in skwq_has_sleeper include/net/sock.h:2142 [inline]
BUG: KASAN: use-after-free in sock_def_write_space+0x1c4/0x350 net/core/sock.c:2926
Read of size 8 at addr ffff888046097080 by task syz-executor.0/9984

CPU: 0 PID: 9984 Comm: syz-executor.0 Not tainted 5.8.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1f0/0x31e lib/dump_stack.c:118
 print_address_description+0x66/0x5a0 mm/kasan/report.c:383
 __kasan_report mm/kasan/report.c:513 [inline]
 kasan_report+0x132/0x1d0 mm/kasan/report.c:530
 list_empty include/linux/list.h:282 [inline]
 waitqueue_active include/linux/wait.h:127 [inline]
 wq_has_sleeper include/linux/wait.h:161 [inline]
 skwq_has_sleeper include/net/sock.h:2142 [inline]
 sock_def_write_space+0x1c4/0x350 net/core/sock.c:2926
 sock_wfree+0x11f/0x200 net/core/sock.c:2060
 skb_release_head_state+0xfb/0x210 net/core/skbuff.c:651
 skb_release_all net/core/skbuff.c:662 [inline]
 __kfree_skb+0x22/0x1c0 net/core/skbuff.c:678
 skb_queue_purge+0x131/0x1c0 net/core/skbuff.c:3077
 qrtr_tun_release+0x43/0x50 net/qrtr/tun.c:118
 __fput+0x2f0/0x750 fs/file_table.c:281
 task_work_run+0x137/0x1c0 kernel/task_work.c:123
 tracehook_notify_resume include/linux/tracehook.h:188 [inline]
 exit_to_usermode_loop arch/x86/entry/common.c:216 [inline]
 __prepare_exit_to_usermode+0x14c/0x1e0 arch/x86/entry/common.c:246
 do_syscall_64+0x7f/0xe0 arch/x86/entry/common.c:368
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x416711
Code: Bad RIP value.
RSP: 002b:00007ffe3e4658f0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000005 RCX: 0000000000416711
RDX: 0000000000000000 RSI: 00000000000000d4 RDI: 0000000000000004
RBP: 0000000000000001 R08: 00000000a77000d4 R09: 00000000a77000d8
R10: 00007ffe3e4659e0 R11: 0000000000000293 R12: 000000000078c900
R13: 000000000078c900 R14: ffffffffffffffff R15: 000000000078bfac

Allocated by task 9988:
 save_stack mm/kasan/common.c:48 [inline]
 set_track mm/kasan/common.c:56 [inline]
 __kasan_kmalloc+0x103/0x140 mm/kasan/common.c:494
 slab_post_alloc_hook mm/slab.h:586 [inline]
 slab_alloc mm/slab.c:3320 [inline]
 kmem_cache_alloc+0x1f5/0x2d0 mm/slab.c:3484
 sock_alloc_inode+0x17/0xc0 net/socket.c:253
 alloc_inode fs/inode.c:232 [inline]
 new_inode_pseudo+0x64/0x240 fs/inode.c:928
 sock_alloc net/socket.c:573 [inline]
 __sock_create+0x12b/0x8c0 net/socket.c:1392
 sock_create net/socket.c:1479 [inline]
 __sys_socket+0xde/0x2d0 net/socket.c:1521
 __do_sys_socket net/socket.c:1530 [inline]
 __se_sys_socket net/socket.c:1528 [inline]
 __x64_sys_socket+0x76/0x80 net/socket.c:1528
 do_syscall_64+0x73/0xe0 arch/x86/entry/common.c:359
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Freed by task 6777:
 save_stack mm/kasan/common.c:48 [inline]
 set_track mm/kasan/common.c:56 [inline]
 kasan_set_free_info mm/kasan/common.c:316 [inline]
 __kasan_slab_free+0x114/0x170 mm/kasan/common.c:455
 __cache_free mm/slab.c:3426 [inline]
 kmem_cache_free+0x7e/0xf0 mm/slab.c:3694
 rcu_do_batch kernel/rcu/tree.c:2396 [inline]
 rcu_core+0x90c/0x1200 kernel/rcu/tree.c:2623
 __do_softirq+0x268/0x80c kernel/softirq.c:292

The buggy address belongs to the object at ffff888046097000
 which belongs to the cache sock_inode_cache of size 1216
The buggy address is located 128 bytes inside of
 1216-byte region [ffff888046097000, ffff8880460974c0)
The buggy address belongs to the page:
page:ffffea00011825c0 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888046097ffd
flags: 0xfffe0000000200(slab)
raw: 00fffe0000000200 ffffea0001184f88 ffffea0001186208 ffff88821bb6ba80
raw: ffff888046097ffd ffff888046097000 0000000100000003 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff888046096f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff888046097000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff888046097080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                   ^
 ffff888046097100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888046097180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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