==================================================================
BUG: KASAN: use-after-free in tcp_or_dccp_get_hashinfo include/net/inet_hashtables.h:186 [inline]
BUG: KASAN: use-after-free in reqsk_queue_unlink net/ipv4/inet_connection_sock.c:956 [inline]
BUG: KASAN: use-after-free in inet_csk_reqsk_queue_drop+0xf3/0x3b0 net/ipv4/inet_connection_sock.c:970
Read of size 8 at addr ffff88807dbdbd80 by task syz-executor.0/16274

CPU: 0 PID: 16274 Comm: syz-executor.0 Not tainted 6.1.82-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/29/2024
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106
 print_address_description mm/kasan/report.c:284 [inline]
 print_report+0x15f/0x4f0 mm/kasan/report.c:395
 kasan_report+0x136/0x160 mm/kasan/report.c:495
 tcp_or_dccp_get_hashinfo include/net/inet_hashtables.h:186 [inline]
 reqsk_queue_unlink net/ipv4/inet_connection_sock.c:956 [inline]
 inet_csk_reqsk_queue_drop+0xf3/0x3b0 net/ipv4/inet_connection_sock.c:970
 inet_csk_reqsk_queue_drop_and_put net/ipv4/inet_connection_sock.c:982 [inline]
 reqsk_timer_handler+0x90b/0xe70 net/ipv4/inet_connection_sock.c:1096
 call_timer_fn+0x1ad/0x6b0 kernel/time/timer.c:1474
 expire_timers kernel/time/timer.c:1519 [inline]
 __run_timers+0x67c/0x890 kernel/time/timer.c:1790
 run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1803
 __do_softirq+0x2e9/0xa4c kernel/softirq.c:571
 invoke_softirq kernel/softirq.c:445 [inline]
 __irq_exit_rcu+0x155/0x240 kernel/softirq.c:650
 irq_exit_rcu+0x5/0x20 kernel/softirq.c:662
 sysvec_apic_timer_interrupt+0x91/0xb0 arch/x86/kernel/apic/apic.c:1106
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:653
RIP: 0010:__sanitizer_cov_trace_const_cmp4+0x7c/0x80 kernel/kcov.c:306
Code: 8d 42 28 4c 39 c8 77 22 89 f8 89 f6 49 ff c2 4c 89 11 48 c7 44 0a 08 05 00 00 00 48 89 44 0a 10 48 89 74 0a 18 4c 89 44 0a 20 <c3> 0f 1f 00 4c 8b 04 24 65 48 8b 0d c4 e7 77 7e 65 8b 05 c5 e7 77
RSP: 0018:ffffc90007faf758 EFLAGS: 00000293
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffff888022b1d940
RDX: ffff888022b1d940 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90007faf918 R08: ffffffff82389e7c R09: ffffed100e6a2bdf
R10: 0000000000000000 R11: dffffc0000000001 R12: dffffc0000000000
R13: 1ffff92000ff5f05 R14: ffff88814c4ddb80 R15: ffff888087541e80
 ext4_chksum fs/ext4/ext4.h:2466 [inline]
 ext4_inode_csum+0x5cc/0xc80 fs/ext4/inode.c:69
 ext4_inode_csum_set fs/ext4/inode.c:115 [inline]
 ext4_fill_raw_inode+0x1949/0x2970 fs/ext4/inode.c:4453
 ext4_do_update_inode fs/ext4/inode.c:5207 [inline]
 ext4_mark_iloc_dirty+0x4e4/0x1d30 fs/ext4/inode.c:5839
 ext4_orphan_del+0xb28/0xc50 fs/ext4/orphan.c:303
 ext4_evict_inode+0xcca/0x1150 fs/ext4/inode.c:317
 evict+0x2a4/0x620 fs/inode.c:666
 do_unlinkat+0x509/0x820 fs/namei.c:4399
 __do_sys_unlink fs/namei.c:4440 [inline]
 __se_sys_unlink fs/namei.c:4438 [inline]
 __x64_sys_unlink+0x45/0x50 fs/namei.c:4438
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f72d2c7d557
Code: 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 57 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffeda1915a8 EFLAGS: 00000206 ORIG_RAX: 0000000000000057
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f72d2c7d557
RDX: 00007ffeda1915d0 RSI: 00007ffeda191660 RDI: 00007ffeda191660
RBP: 00007ffeda191660 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000100 R11: 0000000000000206 R12: 00007ffeda192720
R13: 00007f72d2cc93b9 R14: 000000000008ca1a R15: 0000000000000002
 </TASK>

Allocated by task 11686:
 kasan_save_stack mm/kasan/common.c:45 [inline]
 kasan_set_track+0x4b/0x70 mm/kasan/common.c:52
 __kasan_slab_alloc+0x65/0x70 mm/kasan/common.c:328
 kasan_slab_alloc include/linux/kasan.h:201 [inline]
 slab_post_alloc_hook+0x52/0x3a0 mm/slab.h:737
 slab_alloc_node mm/slub.c:3398 [inline]
 slab_alloc mm/slub.c:3406 [inline]
 __kmem_cache_alloc_lru mm/slub.c:3413 [inline]
 kmem_cache_alloc+0x10c/0x2d0 mm/slub.c:3422
 kmem_cache_zalloc include/linux/slab.h:682 [inline]
 net_alloc net/core/net_namespace.c:410 [inline]
 copy_net_ns+0x143/0x5d0 net/core/net_namespace.c:465
 create_new_namespaces+0x425/0x7a0 kernel/nsproxy.c:110
 unshare_nsproxy_namespaces+0x11e/0x170 kernel/nsproxy.c:226
 ksys_unshare+0x580/0xb20 kernel/fork.c:3203
 __do_sys_unshare kernel/fork.c:3274 [inline]
 __se_sys_unshare kernel/fork.c:3272 [inline]
 __x64_sys_unshare+0x34/0x40 kernel/fork.c:3272
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

Freed by task 3910:
 kasan_save_stack mm/kasan/common.c:45 [inline]
 kasan_set_track+0x4b/0x70 mm/kasan/common.c:52
 kasan_save_free_info+0x27/0x40 mm/kasan/generic.c:516
 ____kasan_slab_free+0xd6/0x120 mm/kasan/common.c:236
 kasan_slab_free include/linux/kasan.h:177 [inline]
 slab_free_hook mm/slub.c:1724 [inline]
 slab_free_freelist_hook mm/slub.c:1750 [inline]
 slab_free mm/slub.c:3661 [inline]
 kmem_cache_free+0x292/0x510 mm/slub.c:3683
 net_free net/core/net_namespace.c:439 [inline]
 cleanup_net+0xab5/0xb60 net/core/net_namespace.c:622
 process_one_work+0x8a9/0x11d0 kernel/workqueue.c:2292
 worker_thread+0xa47/0x1200 kernel/workqueue.c:2439
 kthread+0x28d/0x320 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:307

Last potentially related work creation:
 kasan_save_stack+0x3b/0x60 mm/kasan/common.c:45
 __kasan_record_aux_stack+0xb0/0xc0 mm/kasan/generic.c:486
 insert_work+0x54/0x3d0 kernel/workqueue.c:1361
 __queue_work+0xb4b/0xf90 kernel/workqueue.c:1520
 call_timer_fn+0x1ad/0x6b0 kernel/time/timer.c:1474
 expire_timers kernel/time/timer.c:1514 [inline]
 __run_timers+0x6a8/0x890 kernel/time/timer.c:1790
 __do_softirq+0x2e9/0xa4c kernel/softirq.c:571

The buggy address belongs to the object at ffff88807dbdb880
 which belongs to the cache net_namespace of size 6976
The buggy address is located 1280 bytes inside of
 6976-byte region [ffff88807dbdb880, ffff88807dbdd3c0)

The buggy address belongs to the physical page:
page:ffffea0001f6f600 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88807dbdd4c0 pfn:0x7dbd8
head:ffffea0001f6f600 order:3 compound_mapcount:0 compound_pincount:0
memcg:ffff888027432681
flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000010200 0000000000000000 dead000000000122 ffff888140009500
raw: ffff88807dbdd4c0 0000000080040003 00000001ffffffff ffff888027432681
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, migratetype Unmovable, gfp_mask 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 5351, tgid 5351 (syz-executor.3), ts 235431273295, free_ts 235280412798
 set_page_owner include/linux/page_owner.h:31 [inline]
 post_alloc_hook+0x18d/0x1b0 mm/page_alloc.c:2513
 prep_new_page mm/page_alloc.c:2520 [inline]
 get_page_from_freelist+0x31a1/0x3320 mm/page_alloc.c:4279
 __alloc_pages+0x28d/0x770 mm/page_alloc.c:5545
 alloc_slab_page+0x6a/0x150 mm/slub.c:1794
 allocate_slab mm/slub.c:1939 [inline]
 new_slab+0x84/0x2d0 mm/slub.c:1992
 ___slab_alloc+0xc20/0x1270 mm/slub.c:3180
 __slab_alloc mm/slub.c:3279 [inline]
 slab_alloc_node mm/slub.c:3364 [inline]
 slab_alloc mm/slub.c:3406 [inline]
 __kmem_cache_alloc_lru mm/slub.c:3413 [inline]
 kmem_cache_alloc+0x1a5/0x2d0 mm/slub.c:3422
 kmem_cache_zalloc include/linux/slab.h:682 [inline]
 net_alloc net/core/net_namespace.c:410 [inline]
 copy_net_ns+0x143/0x5d0 net/core/net_namespace.c:465
 create_new_namespaces+0x425/0x7a0 kernel/nsproxy.c:110
 unshare_nsproxy_namespaces+0x11e/0x170 kernel/nsproxy.c:226
 ksys_unshare+0x580/0xb20 kernel/fork.c:3203
 __do_sys_unshare kernel/fork.c:3274 [inline]
 __se_sys_unshare kernel/fork.c:3272 [inline]
 __x64_sys_unshare+0x34/0x40 kernel/fork.c:3272
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:81
 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:1440 [inline]
 free_pcp_prepare mm/page_alloc.c:1490 [inline]
 free_unref_page_prepare+0xf63/0x1120 mm/page_alloc.c:3358
 free_unref_page+0x33/0x3e0 mm/page_alloc.c:3453
 free_slab mm/slub.c:2031 [inline]
 discard_slab mm/slub.c:2037 [inline]
 __unfreeze_partials+0x1b7/0x210 mm/slub.c:2586
 put_cpu_partial+0x17b/0x250 mm/slub.c:2662
 qlink_free mm/kasan/quarantine.c:168 [inline]
 qlist_free_all+0x76/0xe0 mm/kasan/quarantine.c:187
 kasan_quarantine_reduce+0x156/0x170 mm/kasan/quarantine.c:294
 __kasan_slab_alloc+0x1f/0x70 mm/kasan/common.c:305
 kasan_slab_alloc include/linux/kasan.h:201 [inline]
 slab_post_alloc_hook+0x52/0x3a0 mm/slab.h:737
 slab_alloc_node mm/slub.c:3398 [inline]
 slab_alloc mm/slub.c:3406 [inline]
 __kmem_cache_alloc_lru mm/slub.c:3413 [inline]
 kmem_cache_alloc+0x10c/0x2d0 mm/slub.c:3422
 prepare_creds+0x3c/0x610 kernel/cred.c:260
 access_override_creds fs/open.c:376 [inline]
 do_faccessat+0xee/0x890 fs/open.c:440
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

Memory state around the buggy address:
 ffff88807dbdbc80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88807dbdbd00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88807dbdbd80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                   ^
 ffff88807dbdbe00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88807dbdbe80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
----------------
Code disassembly (best guess):
   0:	8d 42 28             	lea    0x28(%rdx),%eax
   3:	4c 39 c8             	cmp    %r9,%rax
   6:	77 22                	ja     0x2a
   8:	89 f8                	mov    %edi,%eax
   a:	89 f6                	mov    %esi,%esi
   c:	49 ff c2             	inc    %r10
   f:	4c 89 11             	mov    %r10,(%rcx)
  12:	48 c7 44 0a 08 05 00 	movq   $0x5,0x8(%rdx,%rcx,1)
  19:	00 00
  1b:	48 89 44 0a 10       	mov    %rax,0x10(%rdx,%rcx,1)
  20:	48 89 74 0a 18       	mov    %rsi,0x18(%rdx,%rcx,1)
  25:	4c 89 44 0a 20       	mov    %r8,0x20(%rdx,%rcx,1)
* 2a:	c3                   	ret <-- trapping instruction
  2b:	0f 1f 00             	nopl   (%rax)
  2e:	4c 8b 04 24          	mov    (%rsp),%r8
  32:	65 48 8b 0d c4 e7 77 	mov    %gs:0x7e77e7c4(%rip),%rcx        # 0x7e77e7fe
  39:	7e
  3a:	65                   	gs
  3b:	8b                   	.byte 0x8b
  3c:	05                   	.byte 0x5
  3d:	c5 e7 77             	(bad)