==================================================================
BUG: KASAN: use-after-free in tcp_retransmit_timer+0x2ef3/0x3360 net/ipv4/tcp_timer.c:511
Read of size 8 at addr ffff88801d3e1e40 by task syz-executor.1/11126

CPU: 0 PID: 11126 Comm: syz-executor.1 Not tainted 5.18.0-rc3-syzkaller-01612-g70a1b25326dd #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+0xeb/0x495 mm/kasan/report.c:313
 print_report mm/kasan/report.c:429 [inline]
 kasan_report.cold+0xf4/0x1c6 mm/kasan/report.c:491
 tcp_retransmit_timer+0x2ef3/0x3360 net/ipv4/tcp_timer.c:511
 tcp_write_timer_handler+0x5e6/0xbc0 net/ipv4/tcp_timer.c:622
 tcp_write_timer+0xa2/0x2b0 net/ipv4/tcp_timer.c:642
 call_timer_fn+0x1a5/0x6b0 kernel/time/timer.c:1421
 expire_timers kernel/time/timer.c:1466 [inline]
 __run_timers.part.0+0x679/0xa80 kernel/time/timer.c:1737
 __run_timers kernel/time/timer.c:1715 [inline]
 run_timer_softirq+0xb3/0x1d0 kernel/time/timer.c:1750
 __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:645
RIP: 0010:preempt_count_sub+0x0/0x150 kernel/sched/core.c:5561
Code: 89 ef e8 63 1d 74 00 eb 82 e8 dc 1d 74 00 eb e4 48 89 df e8 d2 1d 74 00 eb 90 e8 cb 1d 74 00 eb ac 66 0f 1f 84 00 00 00 00 00 <48> c7 c0 00 39 5c 90 53 89 fb 48 ba 00 00 00 00 00 fc ff df 48 89
RSP: 0018:ffffc900035ef9e8 EFLAGS: 00000206
RAX: 0000000000000002 RBX: 0000000000000200 RCX: 1ffffffff1b72981
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000001
RBP: ffffe8ffffc30a40 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff817f7608 R11: 0000000000000000 R12: ffff8880787eb200
R13: ffffe8ffffc30a40 R14: 000000000000000f R15: ffff88804ec24628
 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
 _raw_spin_unlock_irqrestore+0x3d/0x70 kernel/locking/spinlock.c:194
 bpf_percpu_lru_pop_free kernel/bpf/bpf_lru_list.c:426 [inline]
 bpf_lru_pop_free+0x265/0x1b40 kernel/bpf/bpf_lru_list.c:497
 prealloc_lru_pop+0x25/0x2b0 kernel/bpf/hashtab.c:310
 htab_lru_map_update_elem+0x157/0x810 kernel/bpf/hashtab.c:1174
 bpf_map_update_value.isra.0+0x2dc/0x8f0 kernel/bpf/syscall.c:226
 generic_map_update_batch+0x3f2/0x5c0 kernel/bpf/syscall.c:1637
 bpf_map_do_batch+0x2e0/0x5d0 kernel/bpf/syscall.c:4463
 __sys_bpf+0x1d58/0x5750 kernel/bpf/syscall.c:4969
 __do_sys_bpf kernel/bpf/syscall.c:5009 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:5007 [inline]
 __x64_sys_bpf+0x75/0xb0 kernel/bpf/syscall.c:5007
 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: 0033:0x7fe9b70890e9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 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:00007fe9b81a4168 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007fe9b719bf60 RCX: 00007fe9b70890e9
RDX: 0000000000000038 RSI: 0000000020000200 RDI: 000000000000001a
RBP: 00007fe9b70e308d R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffff4743ecf R14: 00007fe9b81a4300 R15: 0000000000022000
 </TASK>

Allocated by task 3627:
 kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38
 kasan_set_track mm/kasan/common.c:45 [inline]
 set_alloc_info mm/kasan/common.c:436 [inline]
 __kasan_slab_alloc+0x90/0xc0 mm/kasan/common.c:469
 kasan_slab_alloc include/linux/kasan.h:224 [inline]
 slab_post_alloc_hook mm/slab.h:749 [inline]
 slab_alloc_node mm/slub.c:3217 [inline]
 slab_alloc mm/slub.c:3225 [inline]
 __kmem_cache_alloc_lru mm/slub.c:3232 [inline]
 kmem_cache_alloc+0x204/0x3b0 mm/slub.c:3242
 kmem_cache_zalloc include/linux/slab.h:704 [inline]
 net_alloc net/core/net_namespace.c:403 [inline]
 copy_net_ns+0x125/0x760 net/core/net_namespace.c:458
 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:3132
 __do_sys_unshare kernel/fork.c:3203 [inline]
 __se_sys_unshare kernel/fork.c:3201 [inline]
 __x64_sys_unshare+0x2d/0x40 kernel/fork.c:3201
 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 8:
 kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38
 kasan_set_track+0x21/0x30 mm/kasan/common.c:45
 kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:370
 ____kasan_slab_free mm/kasan/common.c:366 [inline]
 ____kasan_slab_free+0x166/0x1a0 mm/kasan/common.c:328
 kasan_slab_free include/linux/kasan.h:200 [inline]
 slab_free_hook mm/slub.c:1728 [inline]
 slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1754
 slab_free mm/slub.c:3510 [inline]
 kmem_cache_free+0xdd/0x5a0 mm/slub.c:3527
 net_free net/core/net_namespace.c:432 [inline]
 net_free net/core/net_namespace.c:428 [inline]
 cleanup_net+0x8ba/0xb00 net/core/net_namespace.c:615
 process_one_work+0x996/0x1610 kernel/workqueue.c:2289
 worker_thread+0x665/0x1080 kernel/workqueue.c:2436
 kthread+0x2e9/0x3a0 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298

Last potentially related work creation:
 kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38
 __kasan_record_aux_stack+0xbe/0xd0 mm/kasan/generic.c:348
 insert_work+0x48/0x350 kernel/workqueue.c:1358
 __queue_work+0x62e/0x1140 kernel/workqueue.c:1517
 call_timer_fn+0x1a5/0x6b0 kernel/time/timer.c:1421
 expire_timers kernel/time/timer.c:1461 [inline]
 __run_timers.part.0+0x4a3/0xa80 kernel/time/timer.c:1737
 __run_timers kernel/time/timer.c:1715 [inline]
 run_timer_softirq+0x152/0x1d0 kernel/time/timer.c:1752
 __do_softirq+0x29b/0x9c2 kernel/softirq.c:558

The buggy address belongs to the object at ffff88801d3e1b80
 which belongs to the cache net_namespace of size 6784
The buggy address is located 704 bytes inside of
 6784-byte region [ffff88801d3e1b80, ffff88801d3e3600)

The buggy address belongs to the physical page:
page:ffffea000074f800 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88801d3e3700 pfn:0x1d3e0
head:ffffea000074f800 order:3 compound_mapcount:0 compound_pincount:0
memcg:ffff888066832f41
flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000010200 ffffea0001726200 dead000000000002 ffff888010dcd3c0
raw: ffff88801d3e3700 0000000080040002 00000001ffffffff ffff888066832f41
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 3626, tgid 3626 (syz-executor.0), ts 96800461278, free_ts 96799734049
 prep_new_page mm/page_alloc.c:2441 [inline]
 get_page_from_freelist+0xba2/0x3e00 mm/page_alloc.c:4182
 __alloc_pages+0x1b2/0x500 mm/page_alloc.c:5408
 alloc_pages+0x1aa/0x310 mm/mempolicy.c:2272
 alloc_slab_page mm/slub.c:1799 [inline]
 allocate_slab+0x26c/0x3c0 mm/slub.c:1944
 new_slab mm/slub.c:2004 [inline]
 ___slab_alloc+0x8df/0xf20 mm/slub.c:3005
 __slab_alloc.constprop.0+0x4d/0xa0 mm/slub.c:3092
 slab_alloc_node mm/slub.c:3183 [inline]
 slab_alloc mm/slub.c:3225 [inline]
 __kmem_cache_alloc_lru mm/slub.c:3232 [inline]
 kmem_cache_alloc+0x360/0x3b0 mm/slub.c:3242
 kmem_cache_zalloc include/linux/slab.h:704 [inline]
 net_alloc net/core/net_namespace.c:403 [inline]
 copy_net_ns+0x125/0x760 net/core/net_namespace.c:458
 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:3132
 __do_sys_unshare kernel/fork.c:3203 [inline]
 __se_sys_unshare kernel/fork.c:3201 [inline]
 __x64_sys_unshare+0x2d/0x40 kernel/fork.c:3201
 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:1356 [inline]
 free_pcp_prepare+0x549/0xd20 mm/page_alloc.c:1406
 free_unref_page_prepare mm/page_alloc.c:3328 [inline]
 free_unref_page+0x19/0x6a0 mm/page_alloc.c:3423
 skb_free_head+0xac/0x110 net/core/skbuff.c:655
 skb_release_data+0x67a/0x810 net/core/skbuff.c:677
 skb_release_all net/core/skbuff.c:742 [inline]
 __kfree_skb net/core/skbuff.c:756 [inline]
 consume_skb net/core/skbuff.c:915 [inline]
 consume_skb+0xc2/0x160 net/core/skbuff.c:909
 skb_free_datagram+0x1b/0x1f0 net/core/datagram.c:324
 netlink_recvmsg+0x61a/0xea0 net/netlink/af_netlink.c:1999
 sock_recvmsg_nosec net/socket.c:948 [inline]
 sock_recvmsg net/socket.c:966 [inline]
 sock_recvmsg net/socket.c:962 [inline]
 ____sys_recvmsg+0x2be/0x5f0 net/socket.c:2632
 ___sys_recvmsg+0x127/0x200 net/socket.c:2674
 __sys_recvmsg+0xe2/0x1a0 net/socket.c:2704
 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

Memory state around the buggy address:
 ffff88801d3e1d00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88801d3e1d80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88801d3e1e00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                           ^
 ffff88801d3e1e80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88801d3e1f00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
----------------
Code disassembly (best guess):
   0:	89 ef                	mov    %ebp,%edi
   2:	e8 63 1d 74 00       	callq  0x741d6a
   7:	eb 82                	jmp    0xffffff8b
   9:	e8 dc 1d 74 00       	callq  0x741dea
   e:	eb e4                	jmp    0xfffffff4
  10:	48 89 df             	mov    %rbx,%rdi
  13:	e8 d2 1d 74 00       	callq  0x741dea
  18:	eb 90                	jmp    0xffffffaa
  1a:	e8 cb 1d 74 00       	callq  0x741dea
  1f:	eb ac                	jmp    0xffffffcd
  21:	66 0f 1f 84 00 00 00 	nopw   0x0(%rax,%rax,1)
  28:	00 00
* 2a:	48 c7 c0 00 39 5c 90 	mov    $0xffffffff905c3900,%rax <-- trapping instruction
  31:	53                   	push   %rbx
  32:	89 fb                	mov    %edi,%ebx
  34:	48 ba 00 00 00 00 00 	movabs $0xdffffc0000000000,%rdx
  3b:	fc ff df
  3e:	48                   	rex.W
  3f:	89                   	.byte 0x89