================================================================== BUG: KASAN: use-after-free in __read_once_size include/linux/compiler.h:252 [inline] 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:2143 [inline] BUG: KASAN: use-after-free in sock_def_write_space+0x613/0x640 net/core/sock.c:2924 Read of size 8 at addr ffff88801251f5c0 by task ksoftirqd/1/17 CPU: 1 PID: 17 Comm: ksoftirqd/1 Not tainted 5.7.0-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+0x188/0x20d lib/dump_stack.c:118 print_address_description.constprop.0.cold+0xd3/0x413 mm/kasan/report.c:383 __kasan_report mm/kasan/report.c:513 [inline] kasan_report.cold+0x1f/0x37 mm/kasan/report.c:530 __read_once_size include/linux/compiler.h:252 [inline] 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:2143 [inline] sock_def_write_space+0x613/0x640 net/core/sock.c:2924 sock_wfree+0x1cc/0x240 net/core/sock.c:2058 skb_release_head_state+0xe2/0x250 net/core/skbuff.c:651 skb_release_all+0x11/0x60 net/core/skbuff.c:662 __kfree_skb net/core/skbuff.c:678 [inline] consume_skb net/core/skbuff.c:837 [inline] consume_skb+0xf3/0x400 net/core/skbuff.c:831 __dev_kfree_skb_any+0x9c/0xc0 net/core/dev.c:3090 dev_consume_skb_any include/linux/netdevice.h:3739 [inline] napi_consume_skb+0x40d/0x5c0 net/core/skbuff.c:901 free_old_xmit_skbs+0xd6/0x230 drivers/net/virtio_net.c:1389 start_xmit+0x11f/0x1620 drivers/net/virtio_net.c:1585 __netdev_start_xmit include/linux/netdevice.h:4607 [inline] netdev_start_xmit include/linux/netdevice.h:4621 [inline] xmit_one net/core/dev.c:3545 [inline] dev_hard_start_xmit+0x1a4/0x9b0 net/core/dev.c:3561 sch_direct_xmit+0x345/0xc20 net/sched/sch_generic.c:313 qdisc_restart net/sched/sch_generic.c:376 [inline] __qdisc_run+0x4d1/0x17b0 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+0x548/0xd20 net/core/dev.c:4881 __do_softirq+0x26c/0x9f7 kernel/softirq.c:292 run_ksoftirqd kernel/softirq.c:604 [inline] run_ksoftirqd+0x89/0x100 kernel/softirq.c:596 smpboot_thread_fn+0x653/0x9e0 kernel/smpboot.c:165 kthread+0x388/0x470 kernel/kthread.c:268 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:351 Allocated by task 9768: save_stack+0x1b/0x40 mm/kasan/common.c:48 set_track mm/kasan/common.c:56 [inline] __kasan_kmalloc mm/kasan/common.c:494 [inline] __kasan_kmalloc.constprop.0+0xbf/0xd0 mm/kasan/common.c:467 slab_post_alloc_hook mm/slab.h:586 [inline] slab_alloc mm/slab.c:3320 [inline] kmem_cache_alloc+0x11b/0x740 mm/slab.c:3484 sock_alloc_inode+0x18/0x1c0 net/socket.c:253 alloc_inode+0x61/0x1e0 fs/inode.c:232 new_inode_pseudo+0x14/0xe0 fs/inode.c:928 sock_alloc+0x3c/0x260 net/socket.c:573 __sock_create+0xba/0x730 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+0xf6/0x7d0 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xb3 Freed by task 8761: 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+0xf7/0x140 mm/kasan/common.c:455 __cache_free mm/slab.c:3426 [inline] kmem_cache_free+0x7f/0x320 mm/slab.c:3694 i_callback+0x3f/0x70 fs/inode.c:221 rcu_do_batch kernel/rcu/tree.c:2396 [inline] rcu_core+0x59f/0x1370 kernel/rcu/tree.c:2623 __do_softirq+0x26c/0x9f7 kernel/softirq.c:292 The buggy address belongs to the object at ffff88801251f540 which belongs to the cache sock_inode_cache(17:syz1) of size 1216 The buggy address is located 128 bytes inside of 1216-byte region [ffff88801251f540, ffff88801251fa00) The buggy address belongs to the page: page:ffffea00004947c0 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88801251fffd flags: 0xfffe0000000200(slab) raw: 00fffe0000000200 ffffea000049b208 ffffea00006fbd88 ffff888027299c40 raw: ffff88801251fffd ffff88801251f000 0000000100000003 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88801251f480: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88801251f500: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb >ffff88801251f580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88801251f600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88801251f680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb 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