==================================================================
BUG: KASAN: use-after-free in inet_twsk_kill+0x358/0x3c0 net/ipv4/inet_timewait_sock.c:46
Read of size 8 at addr ffff888011fb04c0 by task syz-executor.1/12743

CPU: 0 PID: 12743 Comm: syz-executor.1 Not tainted 5.16.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
 print_address_description.constprop.0.cold+0x8d/0x336 mm/kasan/report.c:255
 __kasan_report mm/kasan/report.c:442 [inline]
 kasan_report.cold+0x83/0xdf mm/kasan/report.c:459
 inet_twsk_kill+0x358/0x3c0 net/ipv4/inet_timewait_sock.c:46
 call_timer_fn+0x1a5/0x6b0 kernel/time/timer.c:1421
 expire_timers kernel/time/timer.c:1466 [inline]
 __run_timers.part.0+0x67c/0xa30 kernel/time/timer.c:1734
 __run_timers kernel/time/timer.c:1715 [inline]
 run_timer_softirq+0xb3/0x1d0 kernel/time/timer.c:1747
 __do_softirq+0x29b/0x9c2 kernel/softirq.c:558
 invoke_softirq kernel/softirq.c:432 [inline]
 __irq_exit_rcu+0x123/0x180 kernel/softirq.c:637
 irq_exit_rcu+0x5/0x20 kernel/softirq.c:649
 sysvec_apic_timer_interrupt+0x93/0xc0 arch/x86/kernel/apic/apic.c:1097
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638
RIP: 0010:memcg_slab_free_hook mm/slab.h:548 [inline]
RIP: 0010:memcg_slab_free_hook mm/slab.h:534 [inline]
RIP: 0010:do_slab_free mm/slub.c:3442 [inline]
RIP: 0010:___cache_free+0x60/0x370 mm/slub.c:3516
Code: 01 c4 49 8b 44 24 08 48 8d 50 ff a8 01 4c 0f 45 e2 4c 89 e7 e8 41 61 ff ff 48 8b 00 f6 c4 02 b8 00 00 00 00 4c 0f 44 e0 66 90 <48> 85 db 74 49 48 89 df e8 23 c3 75 ff 48 c1 e8 0c 48 89 c5 48 b8
RSP: 0018:ffffc90002d6fb90 EFLAGS: 00000202
RAX: 0000000000000000 RBX: ffff88801e389f80 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff813558b4 RDI: ffffea000078e240
RBP: 0000000000000000 R08: 0000000000000000 R09: 000000000000002e
R10: ffffffff813558aa R11: 000000000000003f R12: ffffea000078e240
R13: ffff888010c41640 R14: ffff88801e389f80 R15: ffff888010c41640
 qlink_free mm/kasan/quarantine.c:157 [inline]
 qlist_free_all+0x6d/0x160 mm/kasan/quarantine.c:176
 kasan_quarantine_reduce+0x180/0x200 mm/kasan/quarantine.c:283
 __kasan_slab_alloc+0xa2/0xc0 mm/kasan/common.c:447
 kasan_slab_alloc include/linux/kasan.h:260 [inline]
 slab_post_alloc_hook mm/slab.h:732 [inline]
 slab_alloc_node mm/slub.c:3230 [inline]
 slab_alloc mm/slub.c:3238 [inline]
 kmem_cache_alloc+0x202/0x3a0 mm/slub.c:3243
 kmem_cache_zalloc include/linux/slab.h:705 [inline]
 lsm_file_alloc security/security.c:572 [inline]
 security_file_alloc+0x34/0x170 security/security.c:1508
 __alloc_file+0xd8/0x280 fs/file_table.c:106
 alloc_empty_file+0x6d/0x170 fs/file_table.c:150
 alloc_file+0x59/0x590 fs/file_table.c:192
 alloc_file_pseudo+0x165/0x250 fs/file_table.c:232
 sock_alloc_file+0x4f/0x190 net/socket.c:463
 sock_map_fd net/socket.c:487 [inline]
 __sys_socket+0x13d/0x200 net/socket.c:1565
 __do_sys_socket net/socket.c:1570 [inline]
 __se_sys_socket net/socket.c:1568 [inline]
 __x64_sys_socket+0x6f/0xb0 net/socket.c:1568
 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+0x44/0xae
RIP: 0033:0x7fef9b6846d7
Code: f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 b8 29 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffd13d1eea8 EFLAGS: 00000202 ORIG_RAX: 0000000000000029
RAX: ffffffffffffffda RBX: 00007ffd13d1f5e0 RCX: 00007fef9b6846d7
RDX: 0000000000000006 RSI: 0000000000000001 RDI: 0000000000000002
RBP: 0000000000000003 R08: 0000000000000000 R09: 00007ffd13d1ef20
R10: 0000000000000010 R11: 0000000000000202 R12: 0000000000000032
R13: 000000000007410c R14: 0000000000000004 R15: 00007ffd13d1f620
 </TASK>

Allocated by task 16821:
 kasan_save_stack+0x1e/0x50 mm/kasan/common.c:38
 kasan_set_track mm/kasan/common.c:46 [inline]
 set_alloc_info mm/kasan/common.c:437 [inline]
 __kasan_slab_alloc+0x90/0xc0 mm/kasan/common.c:470
 kasan_slab_alloc include/linux/kasan.h:260 [inline]
 slab_post_alloc_hook mm/slab.h:732 [inline]
 slab_alloc_node mm/slub.c:3230 [inline]
 slab_alloc mm/slub.c:3238 [inline]
 kmem_cache_alloc+0x202/0x3a0 mm/slub.c:3243
 kmem_cache_zalloc include/linux/slab.h:705 [inline]
 net_alloc net/core/net_namespace.c:407 [inline]
 copy_net_ns+0x125/0x760 net/core/net_namespace.c:462
 create_new_namespaces+0x3f6/0xb20 kernel/nsproxy.c:110
 unshare_nsproxy_namespaces+0xc1/0x1f0 kernel/nsproxy.c:226
 ksys_unshare+0x445/0x920 kernel/fork.c:3048
 __do_sys_unshare kernel/fork.c:3119 [inline]
 __se_sys_unshare kernel/fork.c:3117 [inline]
 __x64_sys_unshare+0x2d/0x40 kernel/fork.c:3117
 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+0x44/0xae

Freed by task 4136:
 kasan_save_stack+0x1e/0x50 mm/kasan/common.c:38
 kasan_set_track+0x21/0x30 mm/kasan/common.c:46
 kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:370
 ____kasan_slab_free mm/kasan/common.c:367 [inline]
 ____kasan_slab_free+0x130/0x160 mm/kasan/common.c:329
 kasan_slab_free include/linux/kasan.h:236 [inline]
 slab_free_hook mm/slub.c:1728 [inline]
 slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1754
 slab_free mm/slub.c:3509 [inline]
 kmem_cache_free+0xd8/0x340 mm/slub.c:3526
 net_free net/core/net_namespace.c:436 [inline]
 net_free net/core/net_namespace.c:432 [inline]
 cleanup_net+0x8ba/0xb00 net/core/net_namespace.c:619
 process_one_work+0x9ac/0x1650 kernel/workqueue.c:2307
 worker_thread+0x657/0x1110 kernel/workqueue.c:2454
 kthread+0x2e9/0x3a0 kernel/kthread.c:377
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295

The buggy address belongs to the object at ffff888011fb0000
 which belongs to the cache net_namespace of size 6528
The buggy address is located 1216 bytes inside of
 6528-byte region [ffff888011fb0000, ffff888011fb1980)
The buggy address belongs to the page:
page:ffffea000047ec00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x11fb0
head:ffffea000047ec00 order:3 compound_mapcount:0 compound_pincount:0
memcg:ffff8880245ea001
flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000010200 0000000000000000 dead000000000001 ffff8880157df000
raw: 0000000000000000 0000000000040004 00000001ffffffff ffff8880245ea001
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 3640, ts 161568138456, free_ts 161563978797
 prep_new_page mm/page_alloc.c:2434 [inline]
 get_page_from_freelist+0xa72/0x2f50 mm/page_alloc.c:4165
 __alloc_pages+0x1b2/0x500 mm/page_alloc.c:5389
 alloc_pages+0x1aa/0x310 mm/mempolicy.c:2271
 alloc_slab_page mm/slub.c:1799 [inline]
 allocate_slab mm/slub.c:1944 [inline]
 new_slab+0x28a/0x3b0 mm/slub.c:2004
 ___slab_alloc+0x87c/0xe90 mm/slub.c:3018
 __slab_alloc.constprop.0+0x4d/0xa0 mm/slub.c:3105
 slab_alloc_node mm/slub.c:3196 [inline]
 slab_alloc mm/slub.c:3238 [inline]
 kmem_cache_alloc+0x35c/0x3a0 mm/slub.c:3243
 kmem_cache_zalloc include/linux/slab.h:705 [inline]
 net_alloc net/core/net_namespace.c:407 [inline]
 copy_net_ns+0x125/0x760 net/core/net_namespace.c:462
 create_new_namespaces+0x3f6/0xb20 kernel/nsproxy.c:110
 unshare_nsproxy_namespaces+0xc1/0x1f0 kernel/nsproxy.c:226
 ksys_unshare+0x445/0x920 kernel/fork.c:3048
 __do_sys_unshare kernel/fork.c:3119 [inline]
 __se_sys_unshare kernel/fork.c:3117 [inline]
 __x64_sys_unshare+0x2d/0x40 kernel/fork.c:3117
 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+0x44/0xae
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1352 [inline]
 free_pcp_prepare+0x374/0x870 mm/page_alloc.c:1404
 free_unref_page_prepare mm/page_alloc.c:3325 [inline]
 free_unref_page+0x19/0x690 mm/page_alloc.c:3404
 __unfreeze_partials+0x320/0x340 mm/slub.c:2536
 qlink_free mm/kasan/quarantine.c:157 [inline]
 qlist_free_all+0x6d/0x160 mm/kasan/quarantine.c:176
 kasan_quarantine_reduce+0x180/0x200 mm/kasan/quarantine.c:283
 __kasan_slab_alloc+0xa2/0xc0 mm/kasan/common.c:447
 kasan_slab_alloc include/linux/kasan.h:260 [inline]
 slab_post_alloc_hook mm/slab.h:732 [inline]
 slab_alloc_node mm/slub.c:3230 [inline]
 __kmalloc_node+0x23a/0x390 mm/slub.c:4468
 kmalloc_node include/linux/slab.h:604 [inline]
 kzalloc_node include/linux/slab.h:726 [inline]
 qdisc_alloc+0xac/0xa10 net/sched/sch_generic.c:941
 qdisc_create_dflt+0x71/0x4b0 net/sched/sch_generic.c:1000
 attach_one_default_qdisc+0xc4/0x1a0 net/sched/sch_generic.c:1148
 netdev_for_each_tx_queue include/linux/netdevice.h:2373 [inline]
 attach_default_qdiscs net/sched/sch_generic.c:1166 [inline]
 dev_activate+0x5d0/0xa60 net/sched/sch_generic.c:1221
 __dev_open+0x388/0x4d0 net/core/dev.c:1416
 __dev_change_flags+0x583/0x750 net/core/dev.c:8139
 dev_change_flags+0x93/0x170 net/core/dev.c:8210
 do_setlink+0x96d/0x3a10 net/core/rtnetlink.c:2729
 __rtnl_newlink+0xde7/0x1750 net/core/rtnetlink.c:3412

Memory state around the buggy address:
 ffff888011fb0380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888011fb0400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff888011fb0480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                           ^
 ffff888011fb0500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888011fb0580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
----------------
Code disassembly (best guess):
   0:	01 c4                	add    %eax,%esp
   2:	49 8b 44 24 08       	mov    0x8(%r12),%rax
   7:	48 8d 50 ff          	lea    -0x1(%rax),%rdx
   b:	a8 01                	test   $0x1,%al
   d:	4c 0f 45 e2          	cmovne %rdx,%r12
  11:	4c 89 e7             	mov    %r12,%rdi
  14:	e8 41 61 ff ff       	callq  0xffff615a
  19:	48 8b 00             	mov    (%rax),%rax
  1c:	f6 c4 02             	test   $0x2,%ah
  1f:	b8 00 00 00 00       	mov    $0x0,%eax
  24:	4c 0f 44 e0          	cmove  %rax,%r12
  28:	66 90                	xchg   %ax,%ax
* 2a:	48 85 db             	test   %rbx,%rbx <-- trapping instruction
  2d:	74 49                	je     0x78
  2f:	48 89 df             	mov    %rbx,%rdi
  32:	e8 23 c3 75 ff       	callq  0xff75c35a
  37:	48 c1 e8 0c          	shr    $0xc,%rax
  3b:	48 89 c5             	mov    %rax,%rbp
  3e:	48                   	rex.W
  3f:	b8                   	.byte 0xb8