==================================================================
BUG: KASAN: use-after-free in tcp_probe_timer net/ipv4/tcp_timer.c:378 [inline]
BUG: KASAN: use-after-free in tcp_write_timer_handler net/ipv4/tcp_timer.c:624 [inline]
BUG: KASAN: use-after-free in tcp_write_timer_handler+0x998/0x9f0 net/ipv4/tcp_timer.c:594
Read of size 1 at addr ffff888072a32225 by task syz-executor.0/10606

CPU: 1 PID: 10606 Comm: syz-executor.0 Not tainted 6.0.0-rc2-syzkaller-00495-g53a406803ca5 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
 print_address_description mm/kasan/report.c:317 [inline]
 print_report.cold+0x2ba/0x719 mm/kasan/report.c:433
 kasan_report+0xb1/0x1e0 mm/kasan/report.c:495
 tcp_probe_timer net/ipv4/tcp_timer.c:378 [inline]
 tcp_write_timer_handler net/ipv4/tcp_timer.c:624 [inline]
 tcp_write_timer_handler+0x998/0x9f0 net/ipv4/tcp_timer.c:594
 tcp_write_timer+0xa2/0x2b0 net/ipv4/tcp_timer.c:637
 call_timer_fn+0x1a0/0x6b0 kernel/time/timer.c:1474
 expire_timers kernel/time/timer.c:1519 [inline]
 __run_timers.part.0+0x674/0xa80 kernel/time/timer.c:1790
 __run_timers kernel/time/timer.c:1768 [inline]
 run_timer_softirq+0xb3/0x1d0 kernel/time/timer.c:1803
 __do_softirq+0x1d3/0x9c6 kernel/softirq.c:571
 invoke_softirq kernel/softirq.c:445 [inline]
 __irq_exit_rcu+0x123/0x180 kernel/softirq.c:650
 irq_exit_rcu+0x5/0x20 kernel/softirq.c:662
 sysvec_apic_timer_interrupt+0x93/0xc0 arch/x86/kernel/apic/apic.c:1106
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:649
RIP: 0010:unwind_next_frame+0x44e/0x1cc0 arch/x86/kernel/unwind_orc.c:464
Code: c1 e9 03 0f b6 34 11 49 8d 4f 01 48 89 cf 48 c1 ef 03 0f b6 14 17 4c 89 ff 83 e7 07 40 38 fe 40 0f 9e c7 40 84 f6 40 0f 95 c6 <40> 84 f7 0f 85 f4 11 00 00 48 89 ce 83 e6 07 40 38 f2 40 0f 9e c6
RSP: 0018:ffffc90005cbefa0 EFLAGS: 00000246
RAX: 0000000000000015 RBX: 0000000000000001 RCX: ffffffff8e5cf395
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000001
RBP: ffffc90005cbf0a8 R08: ffffffff8e5cf390 R09: ffffc90005cbf060
R10: fffff52000b97e17 R11: 000000000008c07c R12: ffffc90005cbf095
R13: ffffc90005cbf060 R14: ffffffff81360e55 R15: ffffffff8e5cf394
 __unwind_start+0x51b/0x800 arch/x86/kernel/unwind_orc.c:712
 unwind_start arch/x86/include/asm/unwind.h:64 [inline]
 arch_stack_walk+0x5c/0xe0 arch/x86/kernel/stacktrace.c:24
 stack_trace_save+0x8c/0xc0 kernel/stacktrace.c:122
 save_stack+0x151/0x1e0 mm/page_owner.c:127
 __set_page_owner+0x2e/0x50 mm/page_owner.c:192
 prep_new_page mm/page_alloc.c:2532 [inline]
 get_page_from_freelist+0x109b/0x2ce0 mm/page_alloc.c:4283
 __alloc_pages+0x1c7/0x510 mm/page_alloc.c:5515
 __folio_alloc+0x12/0x40 mm/page_alloc.c:5546
 vma_alloc_folio+0xf9/0x790 mm/mempolicy.c:2231
 shmem_alloc_folio+0xa5/0x160 mm/shmem.c:1557
 shmem_alloc_and_acct_folio+0x15e/0x5d0 mm/shmem.c:1587
 shmem_getpage_gfp+0x6fe/0x1f30 mm/shmem.c:1920
 shmem_fault+0x1b4/0x750 mm/shmem.c:2127
 __do_fault+0x10d/0x610 mm/memory.c:4173
 do_read_fault mm/memory.c:4518 [inline]
 do_fault mm/memory.c:4647 [inline]
 handle_pte_fault mm/memory.c:4911 [inline]
 __handle_mm_fault+0x2130/0x39b0 mm/memory.c:5053
 handle_mm_fault+0x1c8/0x780 mm/memory.c:5151
 faultin_page mm/gup.c:990 [inline]
 __get_user_pages+0x4f3/0xfd0 mm/gup.c:1219
 populate_vma_page_range+0x23d/0x320 mm/gup.c:1576
 __mm_populate+0x1ea/0x3d0 mm/gup.c:1689
 mm_populate include/linux/mm.h:2656 [inline]
 vm_mmap_pgoff+0x1fd/0x270 mm/util.c:557
 ksys_mmap_pgoff+0x79/0x5a0 mm/mmap.c:1586
 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+0x63/0xcd
RIP: 0033:0x7efca2689279
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:00007efca3791168 EFLAGS: 00000246 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 00007efca279c050 RCX: 00007efca2689279
RDX: 0000000000000003 RSI: 0000000000b36000 RDI: 0000000020000000
RBP: 00007efca26e3189 R08: ffffffffffffffff R09: 0000000000000000
R10: 0000000000008031 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffd943215af R14: 00007efca3791300 R15: 0000000000022000
 </TASK>

Allocated by task 9578:
 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:437 [inline]
 __kasan_slab_alloc+0x90/0xc0 mm/kasan/common.c:470
 kasan_slab_alloc include/linux/kasan.h:224 [inline]
 slab_post_alloc_hook mm/slab.h:727 [inline]
 slab_alloc_node mm/slub.c:3243 [inline]
 slab_alloc mm/slub.c:3251 [inline]
 __kmem_cache_alloc_lru mm/slub.c:3258 [inline]
 kmem_cache_alloc+0x267/0x3b0 mm/slub.c:3268
 kmem_cache_zalloc include/linux/slab.h:723 [inline]
 net_alloc net/core/net_namespace.c:404 [inline]
 copy_net_ns+0x125/0x760 net/core/net_namespace.c:459
 create_new_namespaces+0x3f6/0xb20 kernel/nsproxy.c:110
 unshare_nsproxy_namespaces+0xc1/0x1f0 kernel/nsproxy.c:227
 ksys_unshare+0x445/0x920 kernel/fork.c:3183
 __do_sys_unshare kernel/fork.c:3254 [inline]
 __se_sys_unshare kernel/fork.c:3252 [inline]
 __x64_sys_unshare+0x2d/0x40 kernel/fork.c:3252
 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+0x63/0xcd

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+0x625/0x1210 kernel/workqueue.c:1517
 call_timer_fn+0x1a0/0x6b0 kernel/time/timer.c:1474
 expire_timers kernel/time/timer.c:1514 [inline]
 __run_timers.part.0+0x4a3/0xa80 kernel/time/timer.c:1790
 __run_timers kernel/time/timer.c:1768 [inline]
 run_timer_softirq+0x152/0x1d0 kernel/time/timer.c:1805
 __do_softirq+0x1d3/0x9c6 kernel/softirq.c:571

The buggy address belongs to the object at ffff888072a31b80
 which belongs to the cache net_namespace of size 6784
The buggy address is located 1701 bytes inside of
 6784-byte region [ffff888072a31b80, ffff888072a33600)

The buggy address belongs to the physical page:
page:ffffea0001ca8c00 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888072a35280 pfn:0x72a30
head:ffffea0001ca8c00 order:3 compound_mapcount:0 compound_pincount:0
memcg:ffff88801bf49a01
flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000010200 0000000000000000 dead000000000001 ffff8881400073c0
raw: ffff888072a35280 0000000080040001 00000001ffffffff ffff88801bf49a01
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 3637, tgid 3637 (syz-executor.1), ts 131343999873, free_ts 131342645446
 prep_new_page mm/page_alloc.c:2532 [inline]
 get_page_from_freelist+0x109b/0x2ce0 mm/page_alloc.c:4283
 __alloc_pages+0x1c7/0x510 mm/page_alloc.c:5515
 alloc_pages+0x1a6/0x270 mm/mempolicy.c:2270
 alloc_slab_page mm/slub.c:1824 [inline]
 allocate_slab+0x27e/0x3d0 mm/slub.c:1969
 new_slab mm/slub.c:2029 [inline]
 ___slab_alloc+0x7f1/0xe10 mm/slub.c:3031
 __slab_alloc.constprop.0+0x4d/0xa0 mm/slub.c:3118
 slab_alloc_node mm/slub.c:3209 [inline]
 slab_alloc mm/slub.c:3251 [inline]
 __kmem_cache_alloc_lru mm/slub.c:3258 [inline]
 kmem_cache_alloc+0x38c/0x3b0 mm/slub.c:3268
 kmem_cache_zalloc include/linux/slab.h:723 [inline]
 net_alloc net/core/net_namespace.c:404 [inline]
 copy_net_ns+0x125/0x760 net/core/net_namespace.c:459
 create_new_namespaces+0x3f6/0xb20 kernel/nsproxy.c:110
 unshare_nsproxy_namespaces+0xc1/0x1f0 kernel/nsproxy.c:227
 ksys_unshare+0x445/0x920 kernel/fork.c:3183
 __do_sys_unshare kernel/fork.c:3254 [inline]
 __se_sys_unshare kernel/fork.c:3252 [inline]
 __x64_sys_unshare+0x2d/0x40 kernel/fork.c:3252
 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+0x63/0xcd
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1449 [inline]
 free_pcp_prepare+0x5e4/0xd20 mm/page_alloc.c:1499
 free_unref_page_prepare mm/page_alloc.c:3380 [inline]
 free_unref_page+0x19/0x4d0 mm/page_alloc.c:3476
 skb_free_head+0xac/0x110 net/core/skbuff.c:658
 skb_release_data+0x5f1/0x870 net/core/skbuff.c:687
 skb_release_all net/core/skbuff.c:752 [inline]
 __kfree_skb net/core/skbuff.c:766 [inline]
 consume_skb net/core/skbuff.c:931 [inline]
 consume_skb+0xc2/0x160 net/core/skbuff.c:925
 netlink_recvmsg+0x598/0xe50 net/netlink/af_netlink.c:1998
 sock_recvmsg_nosec net/socket.c:995 [inline]
 sock_recvmsg net/socket.c:1013 [inline]
 sock_recvmsg net/socket.c:1009 [inline]
 ____sys_recvmsg+0x2c7/0x600 net/socket.c:2701
 ___sys_recvmsg+0xf2/0x180 net/socket.c:2743
 __sys_recvmsg+0xf0/0x1c0 net/socket.c:2773
 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+0x63/0xcd

Memory state around the buggy address:
 ffff888072a32100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888072a32180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff888072a32200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                               ^
 ffff888072a32280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888072a32300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
----------------
Code disassembly (best guess):
   0:	c1 e9 03             	shr    $0x3,%ecx
   3:	0f b6 34 11          	movzbl (%rcx,%rdx,1),%esi
   7:	49 8d 4f 01          	lea    0x1(%r15),%rcx
   b:	48 89 cf             	mov    %rcx,%rdi
   e:	48 c1 ef 03          	shr    $0x3,%rdi
  12:	0f b6 14 17          	movzbl (%rdi,%rdx,1),%edx
  16:	4c 89 ff             	mov    %r15,%rdi
  19:	83 e7 07             	and    $0x7,%edi
  1c:	40 38 fe             	cmp    %dil,%sil
  1f:	40 0f 9e c7          	setle  %dil
  23:	40 84 f6             	test   %sil,%sil
  26:	40 0f 95 c6          	setne  %sil
* 2a:	40 84 f7             	test   %sil,%dil <-- trapping instruction
  2d:	0f 85 f4 11 00 00    	jne    0x1227
  33:	48 89 ce             	mov    %rcx,%rsi
  36:	83 e6 07             	and    $0x7,%esi
  39:	40 38 f2             	cmp    %sil,%dl
  3c:	40 0f 9e c6          	setle  %sil