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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:2147 [inline]
BUG: KASAN: use-after-free in sock_def_write_space+0x609/0x630 net/core/sock.c:2947
Read of size 8 at addr ffff88801ca44b00 by task ksoftirqd/2/22

CPU: 2 PID: 22 Comm: ksoftirqd/2 Not tainted 5.8.0-syzkaller #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.12.0-59-gc9ba5276e321-prebuilt.qemu.org 04/01/2014
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x18f/0x20d lib/dump_stack.c:118
 print_address_description.constprop.0.cold+0xae/0x436 mm/kasan/report.c:383
 __kasan_report mm/kasan/report.c:513 [inline]
 kasan_report.cold+0x1f/0x37 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:2147 [inline]
 sock_def_write_space+0x609/0x630 net/core/sock.c:2947
 sock_wfree+0x1cc/0x240 net/core/sock.c:2060
 skb_release_head_state+0x9f/0x250 net/core/skbuff.c:651
 skb_release_all net/core/skbuff.c:662 [inline]
 __kfree_skb net/core/skbuff.c:678 [inline]
 consume_skb net/core/skbuff.c:837 [inline]
 consume_skb+0x89/0x160 net/core/skbuff.c:831
 __dev_kfree_skb_any+0x9c/0xc0 net/core/dev.c:3101
 dev_consume_skb_any include/linux/netdevice.h:3740 [inline]
 napi_consume_skb+0x24f/0x370 net/core/skbuff.c:901
 free_old_xmit_skbs+0xd5/0x230 drivers/net/virtio_net.c:1389
 start_xmit+0x123/0x15f0 drivers/net/virtio_net.c:1585
 __netdev_start_xmit include/linux/netdevice.h:4613 [inline]
 netdev_start_xmit include/linux/netdevice.h:4627 [inline]
 xmit_one net/core/dev.c:3556 [inline]
 dev_hard_start_xmit+0x193/0x950 net/core/dev.c:3572
 sch_direct_xmit+0x2e1/0xbd0 net/sched/sch_generic.c:313
 qdisc_restart net/sched/sch_generic.c:376 [inline]
 __qdisc_run+0x4b9/0x1620 net/sched/sch_generic.c:384
 qdisc_run include/net/pkt_sched.h:134 [inline]
 qdisc_run include/net/pkt_sched.h:126 [inline]
 net_tx_action+0x55a/0xd60 net/core/dev.c:4894
 __do_softirq+0x2de/0xa24 kernel/softirq.c:298
 run_ksoftirqd kernel/softirq.c:652 [inline]
 run_ksoftirqd+0x89/0x100 kernel/softirq.c:644
 smpboot_thread_fn+0x655/0x9e0 kernel/smpboot.c:165
 kthread+0x3b5/0x4a0 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294

Allocated by task 26068:
 save_stack+0x1b/0x40 mm/kasan/common.c:48
 set_track mm/kasan/common.c:56 [inline]
 __kasan_kmalloc.constprop.0+0xc2/0xd0 mm/kasan/common.c:494
 slab_post_alloc_hook mm/slab.h:586 [inline]
 slab_alloc mm/slab.c:3320 [inline]
 kmem_cache_alloc+0x12c/0x3b0 mm/slab.c:3484
 sock_alloc_inode+0x18/0x1c0 net/socket.c:253
 alloc_inode+0x61/0x230 fs/inode.c:232
 new_inode_pseudo+0x14/0xe0 fs/inode.c:928
 sock_alloc+0x3c/0x260 net/socket.c:573
 __sock_create+0xb9/0x740 net/socket.c:1392
 sock_create net/socket.c:1479 [inline]
 __sys_socket+0xef/0x200 net/socket.c:1521
 __do_sys_socket net/socket.c:1530 [inline]
 __se_sys_socket net/socket.c:1528 [inline]
 __x64_sys_socket+0x6f/0xb0 net/socket.c:1528
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Freed by task 27:
 save_stack+0x1b/0x40 mm/kasan/common.c:48
 set_track mm/kasan/common.c:56 [inline]
 kasan_set_free_info mm/kasan/common.c:316 [inline]
 __kasan_slab_free+0xf5/0x140 mm/kasan/common.c:455
 __cache_free mm/slab.c:3426 [inline]
 kmem_cache_free+0x7f/0x310 mm/slab.c:3694
 i_callback+0x3f/0x70 fs/inode.c:221
 rcu_do_batch kernel/rcu/tree.c:2427 [inline]
 rcu_core+0x5c7/0x1190 kernel/rcu/tree.c:2655
 __do_softirq+0x2de/0xa24 kernel/softirq.c:298

The buggy address belongs to the object at ffff88801ca44a80
 which belongs to the cache sock_inode_cache(49:syz3) of size 1216
The buggy address is located 128 bytes inside of
 1216-byte region [ffff88801ca44a80, ffff88801ca44f40)
The buggy address belongs to the page:
page:ffffea0000729100 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88801ca44ffd
flags: 0xfffe0000000200(slab)
raw: 00fffe0000000200 ffffea00000355c8 ffff888028774250 ffff88805a926a80
raw: ffff88801ca44ffd ffff88801ca44000 0000000100000003 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff88801ca44a00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88801ca44a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88801ca44b00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                   ^
 ffff88801ca44b80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88801ca44c00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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