==================================================================
BUG: KASAN: use-after-free in hlist_add_head include/linux/list.h:814 [inline]
BUG: KASAN: use-after-free in enqueue_timer+0xb7/0x300 kernel/time/timer.c:541
Write of size 8 at addr ffff8881de4a71c8 by task syz.3.1454/4459

CPU: 1 PID: 4459 Comm: syz.3.1454 Not tainted 5.4.276-syzkaller-00020-g4275fce9fe94 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1d8/0x241 lib/dump_stack.c:118
 print_address_description+0x8c/0x600 mm/kasan/report.c:384
 __kasan_report+0xf3/0x120 mm/kasan/report.c:516
 kasan_report+0x30/0x60 mm/kasan/common.c:653
 hlist_add_head include/linux/list.h:814 [inline]
 enqueue_timer+0xb7/0x300 kernel/time/timer.c:541
 __internal_add_timer kernel/time/timer.c:554 [inline]
 internal_add_timer+0x240/0x430 kernel/time/timer.c:604
 __mod_timer+0x6f1/0x13e0 kernel/time/timer.c:1065
 call_timer_fn+0x36/0x390 kernel/time/timer.c:1448
 expire_timers kernel/time/timer.c:1493 [inline]
 __run_timers+0x879/0xbe0 kernel/time/timer.c:1817
 run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1830
 __do_softirq+0x23b/0x6b7 kernel/softirq.c:292
 invoke_softirq kernel/softirq.c:373 [inline]
 irq_exit+0x195/0x1c0 kernel/softirq.c:413
 exiting_irq arch/x86/include/asm/apic.h:539 [inline]
 smp_apic_timer_interrupt+0x11a/0x460 arch/x86/kernel/apic/apic.c:1149
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:834
 </IRQ>
RIP: 0010:get_current arch/x86/include/asm/current.h:15 [inline]
RIP: 0010:write_comp_data kernel/kcov.c:207 [inline]
RIP: 0010:__sanitizer_cov_trace_cmp8+0x4/0x70 kernel/kcov.c:254
Code: 77 cf 89 f8 89 f6 48 c7 44 0a 08 04 00 00 00 48 89 44 0a 10 48 89 74 0a 18 4c 89 44 0a 20 49 ff c1 4c 89 09 c3 90 4c 8b 04 24 <65> 48 8b 15 d4 52 9e 7e 65 8b 05 d9 52 9e 7e a9 00 01 1f 00 74 01
RSP: 0018:ffff8881d98bf7d8 EFLAGS: 00000207 ORIG_RAX: ffffffffffffff13
RAX: ffffffff83aaa939 RBX: 000000000000144d RCX: 0000000000040000
RDX: ffffc900033f9000 RSI: 000000000000144d RDI: 000000000000144d
RBP: ffff8881d98bf910 R08: ffffffff83aaa9ec R09: 0000000000000003
R10: ffffffffffffffff R11: dffffc0000000001 R12: 0000000000000002
R13: dffffc0000000000 R14: 1ffff1103b317f12 R15: 000000000000144d
 inet_twsk_purge+0x6ec/0x870 net/ipv4/inet_timewait_sock.c:307
 tcp_sk_exit_batch+0x28/0x90 net/ipv4/tcp_ipv4.c:2780
 ops_exit_list net/core/net_namespace.c:187 [inline]
 setup_net+0x639/0x990 net/core/net_namespace.c:371
 copy_net_ns+0x30d/0x510 net/core/net_namespace.c:489
 create_new_namespaces+0x47a/0x570 kernel/nsproxy.c:103
 copy_namespaces+0x169/0x1b0 kernel/nsproxy.c:161
 copy_process+0x12da/0x3230 kernel/fork.c:2055
 _do_fork+0x197/0x900 kernel/fork.c:2399
 __do_sys_clone kernel/fork.c:2557 [inline]
 __se_sys_clone kernel/fork.c:2538 [inline]
 __x64_sys_clone+0x26b/0x2c0 kernel/fork.c:2538
 do_syscall_64+0xca/0x1c0 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x5c/0xc1
RIP: 0033:0x7f75ba774b99
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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f75b99f5ff8 EFLAGS: 00000206 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007f75ba902fa0 RCX: 00007f75ba774b99
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00000000d004e000
RBP: 00007f75ba7f577e R08: 0000000000000000 R09: 0000000000000000
R10: 0000000020000140 R11: 0000000000000206 R12: 0000000000000000
R13: 000000000000000b R14: 00007f75ba902fa0 R15: 00007ffc01e1f1e8

Allocated by task 4574:
 save_stack mm/kasan/common.c:70 [inline]
 set_track mm/kasan/common.c:78 [inline]
 __kasan_kmalloc+0x171/0x210 mm/kasan/common.c:529
 slab_post_alloc_hook mm/slab.h:584 [inline]
 slab_alloc_node mm/slub.c:2829 [inline]
 slab_alloc mm/slub.c:2837 [inline]
 kmem_cache_alloc+0xd9/0x250 mm/slub.c:2842
 sk_prot_alloc+0x63/0x3e0 net/core/sock.c:1616
 sk_alloc+0x35/0x2f0 net/core/sock.c:1680
 tipc_sk_create+0xfb/0x18b0 net/tipc/socket.c:443
 __sock_create+0x3cb/0x7a0 net/socket.c:1427
 sock_create net/socket.c:1478 [inline]
 __sys_socketpair+0x28f/0x6e0 net/socket.c:1578
 __do_sys_socketpair net/socket.c:1631 [inline]
 __se_sys_socketpair net/socket.c:1628 [inline]
 __x64_sys_socketpair+0x97/0xb0 net/socket.c:1628
 do_syscall_64+0xca/0x1c0 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x5c/0xc1

Freed by task 17:
 save_stack mm/kasan/common.c:70 [inline]
 set_track mm/kasan/common.c:78 [inline]
 kasan_set_free_info mm/kasan/common.c:345 [inline]
 __kasan_slab_free+0x1b5/0x270 mm/kasan/common.c:487
 slab_free_hook mm/slub.c:1455 [inline]
 slab_free_freelist_hook mm/slub.c:1494 [inline]
 slab_free mm/slub.c:3080 [inline]
 kmem_cache_free+0x10b/0x2c0 mm/slub.c:3096
 sk_prot_free net/core/sock.c:1661 [inline]
 __sk_destruct+0x460/0x5e0 net/core/sock.c:1749
 __rcu_reclaim kernel/rcu/rcu.h:222 [inline]
 rcu_do_batch+0x492/0xa00 kernel/rcu/tree.c:2167
 rcu_core+0x4c8/0xcb0 kernel/rcu/tree.c:2387
 __do_softirq+0x23b/0x6b7 kernel/softirq.c:292

The buggy address belongs to the object at ffff8881de4a6f80
 which belongs to the cache TIPC of size 1072
The buggy address is located 584 bytes inside of
 1072-byte region [ffff8881de4a6f80, ffff8881de4a73b0)
The buggy address belongs to the page:
page:ffffea0007792900 refcount:1 mapcount:0 mapping:ffff8881eebd7b80 index:0x0 compound_mapcount: 0
flags: 0x8000000000010200(slab|head)
raw: 8000000000010200 dead000000000100 dead000000000122 ffff8881eebd7b80
raw: 0000000000000000 00000000800d000d 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 2, migratetype Unmovable, gfp_mask 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL)
 set_page_owner include/linux/page_owner.h:31 [inline]
 post_alloc_hook mm/page_alloc.c:2165 [inline]
 prep_new_page+0x18f/0x370 mm/page_alloc.c:2171
 get_page_from_freelist+0x2d13/0x2d90 mm/page_alloc.c:3794
 __alloc_pages_nodemask+0x393/0x840 mm/page_alloc.c:4893
 alloc_slab_page+0x39/0x3c0 mm/slub.c:343
 allocate_slab mm/slub.c:1683 [inline]
 new_slab+0x97/0x440 mm/slub.c:1749
 new_slab_objects mm/slub.c:2505 [inline]
 ___slab_alloc+0x2fe/0x490 mm/slub.c:2667
 __slab_alloc+0x62/0xa0 mm/slub.c:2707
 slab_alloc_node mm/slub.c:2792 [inline]
 slab_alloc mm/slub.c:2837 [inline]
 kmem_cache_alloc+0x109/0x250 mm/slub.c:2842
 sk_prot_alloc+0x63/0x3e0 net/core/sock.c:1616
 sk_alloc+0x35/0x2f0 net/core/sock.c:1680
 tipc_sk_create+0xfb/0x18b0 net/tipc/socket.c:443
 __sock_create+0x3cb/0x7a0 net/socket.c:1427
 sock_create net/socket.c:1478 [inline]
 __sys_socketpair+0x308/0x6e0 net/socket.c:1582
 __do_sys_socketpair net/socket.c:1631 [inline]
 __se_sys_socketpair net/socket.c:1628 [inline]
 __x64_sys_socketpair+0x97/0xb0 net/socket.c:1628
 do_syscall_64+0xca/0x1c0 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x5c/0xc1
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1176 [inline]
 __free_pages_ok+0x847/0x950 mm/page_alloc.c:1438
 free_the_page mm/page_alloc.c:4955 [inline]
 __free_pages+0x91/0x140 mm/page_alloc.c:4961
 bpf_check+0x8aaa/0xb340 kernel/bpf/verifier.c:9731
 bpf_prog_load kernel/bpf/syscall.c:1724 [inline]
 __do_sys_bpf kernel/bpf/syscall.c:2891 [inline]
 __se_sys_bpf+0x8139/0xbcb0 kernel/bpf/syscall.c:2849
 do_syscall_64+0xca/0x1c0 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x5c/0xc1

Memory state around the buggy address:
 ffff8881de4a7080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8881de4a7100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff8881de4a7180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                              ^
 ffff8881de4a7200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8881de4a7280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
BUG: kernel NULL pointer dereference, address: 0000000000000000
#PF: supervisor instruction fetch in kernel mode
#PF: error_code(0x0010) - not-present page
PGD 0 P4D 0 
Oops: 0010 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 4590 Comm: syz.1.1497 Tainted: G    B             5.4.276-syzkaller-00020-g4275fce9fe94 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024
RIP: 0010:0x0
Code: Bad RIP value.
RSP: 0018:ffff8881f6f09d18 EFLAGS: 00010206
RAX: ffffffff8154d48a RBX: 0000000000000100 RCX: ffff8881dbb70fc0
RDX: 0000000080000100 RSI: 0000000000000000 RDI: ffff8881de4a71c0
RBP: ffff8881f6f09ec8 R08: ffffffff8154d0ce R09: 0000000000000003
R10: ffffffffffffffff R11: dffffc0000000001 R12: 00000000ffffb760
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8881de4a71c0
FS:  0000000000000000(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 0000000005e0e000 CR4: 00000000003406a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 call_timer_fn+0x36/0x390 kernel/time/timer.c:1448
 expire_timers kernel/time/timer.c:1493 [inline]
 __run_timers+0x879/0xbe0 kernel/time/timer.c:1817
 run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1830
 __do_softirq+0x23b/0x6b7 kernel/softirq.c:292
 invoke_softirq kernel/softirq.c:373 [inline]
 irq_exit+0x195/0x1c0 kernel/softirq.c:413
 exiting_irq arch/x86/include/asm/apic.h:539 [inline]
 smp_apic_timer_interrupt+0x11a/0x460 arch/x86/kernel/apic/apic.c:1149
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:834
 </IRQ>
RIP: 0010:check_kcov_mode kernel/kcov.c:153 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x13/0x50 kernel/kcov.c:187
Code: a7 f1 85 e8 4f de 2f 00 c3 90 90 90 90 90 90 90 90 90 90 90 90 90 90 48 8b 04 24 65 48 8b 0d 74 54 9e 7e 65 8b 15 79 54 9e 7e <f7> c2 00 01 1f 00 74 01 c3 8b 91 00 0a 00 00 83 fa 02 75 f4 48 8b
RSP: 0018:ffff8881f24d7438 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: ffffffff81824762 RBX: 0000000000000000 RCX: ffff8881dbb70fc0
RDX: 0000000080000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffff8881f24d7550 R08: ffffffff81824644 R09: fffff94000ee8097
R10: 0000000000000000 R11: dffffc0000000001 R12: ffff8881e2df9010
R13: 0000000000000000 R14: dffffc0000000000 R15: ffffea0007740480
 release_pages+0x362/0xb20 mm/swap.c:802
 tlb_batch_pages_flush mm/mmu_gather.c:49 [inline]
 tlb_flush_mmu_free mm/mmu_gather.c:189 [inline]
 tlb_flush_mmu+0xc8/0x170 mm/mmu_gather.c:196
 zap_pte_range mm/memory.c:1173 [inline]
 zap_pmd_range mm/memory.c:1222 [inline]
 zap_pud_range mm/memory.c:1251 [inline]
 zap_p4d_range mm/memory.c:1272 [inline]
 unmap_page_range+0x1d29/0x2620 mm/memory.c:1293
 unmap_single_vma mm/memory.c:1338 [inline]
 unmap_vmas+0x355/0x4b0 mm/memory.c:1370
 exit_mmap+0x2bc/0x520 mm/mmap.c:3191
 __mmput+0x8e/0x2c0 kernel/fork.c:1101
 exit_mm kernel/exit.c:536 [inline]
 do_exit+0xc08/0x2bc0 kernel/exit.c:846
 do_group_exit+0x138/0x300 kernel/exit.c:982
 get_signal+0xdb1/0x1440 kernel/signal.c:2735
 do_signal+0xb0/0x11f0 arch/x86/kernel/signal.c:809
 exit_to_usermode_loop+0xc0/0x1a0 arch/x86/entry/common.c:159
 prepare_exit_to_usermode+0x199/0x200 arch/x86/entry/common.c:194
 entry_SYSCALL_64_after_hwframe+0x5c/0xc1
RIP: 0033:0x7f2d3e3b6b99
Code: Bad RIP value.
RSP: 002b:00007f2d3d5f60f8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00007f2d3e545158 RCX: 00007f2d3e3b6b99
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f2d3e545158
RBP: 00007f2d3e545150 R08: 00007f2d3d5f66c0 R09: 00007f2d3d5f66c0
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f2d3e54515c
R13: 000000000000006e R14: 00007ffdd5534250 R15: 00007ffdd5534338
Modules linked in:
CR2: 0000000000000000
---[ end trace 8b12993d0da7a23f ]---
RIP: 0010:0x0
Code: Bad RIP value.
RSP: 0018:ffff8881f6f09d18 EFLAGS: 00010206
RAX: ffffffff8154d48a RBX: 0000000000000100 RCX: ffff8881dbb70fc0
RDX: 0000000080000100 RSI: 0000000000000000 RDI: ffff8881de4a71c0
RBP: ffff8881f6f09ec8 R08: ffffffff8154d0ce R09: 0000000000000003
R10: ffffffffffffffff R11: dffffc0000000001 R12: 00000000ffffb760
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8881de4a71c0
FS:  0000000000000000(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 0000000005e0e000 CR4: 00000000003406a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	77 cf                	ja     0xffffffd1
   2:	89 f8                	mov    %edi,%eax
   4:	89 f6                	mov    %esi,%esi
   6:	48 c7 44 0a 08 04 00 	movq   $0x4,0x8(%rdx,%rcx,1)
   d:	00 00
   f:	48 89 44 0a 10       	mov    %rax,0x10(%rdx,%rcx,1)
  14:	48 89 74 0a 18       	mov    %rsi,0x18(%rdx,%rcx,1)
  19:	4c 89 44 0a 20       	mov    %r8,0x20(%rdx,%rcx,1)
  1e:	49 ff c1             	inc    %r9
  21:	4c 89 09             	mov    %r9,(%rcx)
  24:	c3                   	ret
  25:	90                   	nop
  26:	4c 8b 04 24          	mov    (%rsp),%r8
* 2a:	65 48 8b 15 d4 52 9e 	mov    %gs:0x7e9e52d4(%rip),%rdx        # 0x7e9e5306 <-- trapping instruction
  31:	7e
  32:	65 8b 05 d9 52 9e 7e 	mov    %gs:0x7e9e52d9(%rip),%eax        # 0x7e9e5312
  39:	a9 00 01 1f 00       	test   $0x1f0100,%eax
  3e:	74 01                	je     0x41