==================================================================
BUG: KASAN: use-after-free in __hlist_del include/linux/list.h:791 [inline]
BUG: KASAN: use-after-free in detach_timer kernel/time/timer.c:824 [inline]
BUG: KASAN: use-after-free in expire_timers kernel/time/timer.c:1482 [inline]
BUG: KASAN: use-after-free in __run_timers+0x759/0xb60 kernel/time/timer.c:1817
Write of size 8 at addr ffff8881ecbdb1c8 by task syz.9.1666/6267

CPU: 0 PID: 6267 Comm: syz.9.1666 Tainted: G        W         5.4.292-syzkaller-00021-gcd8e74fa0fa3 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Call Trace:
 <IRQ>
 __dump_stack+0x1e/0x20 lib/dump_stack.c:77
 dump_stack+0x15b/0x1b8 lib/dump_stack.c:118
 print_address_description+0x8d/0x4c0 mm/kasan/report.c:384
 __kasan_report+0xef/0x120 mm/kasan/report.c:516
 kasan_report+0x30/0x60 mm/kasan/common.c:653
 __asan_report_store8_noabort+0x17/0x20 mm/kasan/generic_report.c:137
 __hlist_del include/linux/list.h:791 [inline]
 detach_timer kernel/time/timer.c:824 [inline]
 expire_timers kernel/time/timer.c:1482 [inline]
 __run_timers+0x759/0xb60 kernel/time/timer.c:1817
 run_timer_softirq+0x6a/0xf0 kernel/time/timer.c:1830
 __do_softirq+0x236/0x660 kernel/softirq.c:292
 invoke_softirq kernel/softirq.c:373 [inline]
 irq_exit+0x197/0x1c0 kernel/softirq.c:413
 exiting_irq arch/x86/include/asm/apic.h:539 [inline]
 smp_apic_timer_interrupt+0x11d/0x490 arch/x86/kernel/apic/apic.c:1161
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:834
 </IRQ>
RIP: 0010:freelist_ptr mm/slub.c:265 [inline]
RIP: 0010:freelist_dereference mm/slub.c:276 [inline]
RIP: 0010:get_freepointer mm/slub.c:282 [inline]
RIP: 0010:get_freepointer_safe mm/slub.c:296 [inline]
RIP: 0010:slab_alloc_node mm/slub.c:2795 [inline]
RIP: 0010:slab_alloc mm/slub.c:2837 [inline]
RIP: 0010:kmem_cache_alloc+0x9a/0x270 mm/slub.c:2842
Code: 4d 85 ff 0f 84 a4 00 00 00 48 83 78 10 00 0f 84 99 00 00 00 41 8b 45 20 49 8d 0c 07 49 8b 9d b0 01 00 00 48 0f c9 49 33 1c 07 <48> 31 cb 48 89 d1 48 83 c1 08 49 8b 7d 00 4c 89 f8 65 48 0f c7 0f
RSP: 0018:ffff8881e468f830 EFLAGS: 00000206 ORIG_RAX: ffffffffffffff13
RAX: 0000000000000000 RBX: 00baaeea8188ffff RCX: 00baaeea8188ffff
RDX: 000000000009ccc0 RSI: 000000000001f762 RDI: 000000000001f763
RBP: ffff8881e468f860 R08: dffffc0000000000 R09: ffffed103d2695e9
R10: ffffed103d2695e9 R11: 1ffff1103d2695e8 R12: ffff8881f1ccc500
R13: ffff8881f1ccc500 R14: 0000000000000a20 R15: ffff8881eaaeba00
 skb_clone+0x1e9/0x380 net/core/skbuff.c:1467
 ____bpf_clone_redirect net/core/filter.c:2136 [inline]
 bpf_clone_redirect+0xa7/0x380 net/core/filter.c:2123
 bpf_prog_2658eab614f371a8+0xf23/0x1000
 bpf_call_func include/linux/filter.h:627 [inline]
 bpf_test_run+0x1ea/0x5d0 net/bpf/test_run.c:44
 bpf_prog_test_run_skb+0x721/0xdc0 net/bpf/test_run.c:311
 bpf_prog_test_run+0x21a/0x2a0 kernel/bpf/syscall.c:2124
 __do_sys_bpf kernel/bpf/syscall.c:2909 [inline]
 __se_sys_bpf+0x49a/0x570 kernel/bpf/syscall.c:2849
 __x64_sys_bpf+0x7b/0x90 kernel/bpf/syscall.c:2849
 do_syscall_64+0xcf/0x170 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x5c/0xc1
RIP: 0033:0x7f5e69c77969
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:00007f5e682e0038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007f5e69e9efa0 RCX: 00007f5e69c77969
RDX: 0000000000000050 RSI: 0000200000001300 RDI: 000000000000000a
RBP: 00007f5e69cf9ab1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f5e69e9efa0 R15: 00007fff139b9968

The buggy address belongs to the page:
page:ffffea0007b2f6c0 refcount:1 mapcount:-1024 mapping:0000000000000000 index:0x0
flags: 0x8000000000000000()
raw: 8000000000000000 dead000000000100 dead000000000122 0000000000000000
raw: 0000000000000000 0000000000000000 00000001fffffbff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x500dc0(GFP_USER|__GFP_ZERO|__GFP_ACCOUNT)
 set_page_owner include/linux/page_owner.h:31 [inline]
 post_alloc_hook mm/page_alloc.c:2165 [inline]
 prep_new_page+0x35e/0x370 mm/page_alloc.c:2171
 get_page_from_freelist+0x1296/0x1310 mm/page_alloc.c:3794
 __alloc_pages_nodemask+0x202/0x4b0 mm/page_alloc.c:4894
 __alloc_pages include/linux/gfp.h:503 [inline]
 __alloc_pages_node include/linux/gfp.h:516 [inline]
 alloc_pages_node include/linux/gfp.h:530 [inline]
 __pte_alloc_one include/asm-generic/pgalloc.h:63 [inline]
 pte_alloc_one+0x1f/0xc0 arch/x86/mm/pgtable.c:26
 __pte_alloc+0x21/0x1c0 mm/memory.c:440
 do_anonymous_page mm/memory.c:3170 [inline]
 handle_pte_fault mm/memory.c:4057 [inline]
 __handle_mm_fault mm/memory.c:4183 [inline]
 handle_mm_fault+0x367e/0x3930 mm/memory.c:4220
 do_user_addr_fault arch/x86/mm/fault.c:1444 [inline]
 __do_page_fault+0x4c0/0xb20 arch/x86/mm/fault.c:1505
 do_page_fault+0x37/0x320 arch/x86/mm/fault.c:1529
 page_fault+0x2f/0x40 arch/x86/entry/entry_64.S:1206
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_pcp_prepare mm/page_alloc.c:1233 [inline]
 free_unref_page_prepare+0x2a9/0x3a0 mm/page_alloc.c:3085
 free_unref_page mm/page_alloc.c:3134 [inline]
 free_the_page mm/page_alloc.c:4954 [inline]
 __free_pages+0xaa/0x110 mm/page_alloc.c:4962
 __vunmap+0x76a/0x8a0 mm/vmalloc.c:2260
 __vfree mm/vmalloc.c:2308 [inline]
 vfree+0x61/0x90 mm/vmalloc.c:2338
 kvfree+0x3d/0x50 mm/util.c:623
 __vunmap+0x801/0x8a0 mm/vmalloc.c:2264
 __vfree mm/vmalloc.c:2308 [inline]
 vfree+0x61/0x90 mm/vmalloc.c:2338
 kcov_mmap+0x8c/0x120 kernel/kcov.c:474
 call_mmap include/linux/fs.h:1996 [inline]
 mmap_region+0x101b/0x15a0 mm/mmap.c:1812
 do_mmap+0x826/0xd90 mm/mmap.c:1581
 do_mmap_pgoff include/linux/mm.h:2480 [inline]
 vm_mmap_pgoff+0x195/0x230 mm/util.c:528
 ksys_mmap_pgoff+0x16f/0x1e0 mm/mmap.c:1631
 __do_sys_mmap arch/x86/kernel/sys_x86_64.c:97 [inline]
 __se_sys_mmap arch/x86/kernel/sys_x86_64.c:88 [inline]
 __x64_sys_mmap+0xfa/0x110 arch/x86/kernel/sys_x86_64.c:88
 do_syscall_64+0xcf/0x170 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x5c/0xc1

Memory state around the buggy address:
 ffff8881ecbdb080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8881ecbdb100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff8881ecbdb180: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
                                              ^
 ffff8881ecbdb200: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8881ecbdb280: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================
BUG: kernel NULL pointer dereference, address: 0000000000000000
#PF: supervisor instruction fetch in kernel mode
#PF: error_code(0x0010) - not-present page
PGD 1d6ae1067 P4D 1d6ae1067 PUD 0 
Oops: 0010 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 6267 Comm: syz.9.1666 Tainted: G    B   W         5.4.292-syzkaller-00021-gcd8e74fa0fa3 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:0x0
Code: Bad RIP value.
RSP: 0018:ffff8881f6e09cf0 EFLAGS: 00010202
RAX: ffffffff8150a590 RBX: 0000000000000101 RCX: ffff8881e934af40
RDX: 0000000000000101 RSI: 0000000000000000 RDI: ffff8881ecbdb1c0
RBP: ffff8881f6e09d30 R08: 0000000000000004 R09: 0000000000000003
R10: ffffed103edc1398 R11: 1ffff1103edc1398 R12: 00000000ffffcf98
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8881ecbdb1c0
FS:  00007f5e682e06c0(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 00000001e8bd2000 CR4: 00000000003406b0
DR0: 0000000000000000 DR1: 0000200000000300 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 call_timer_fn+0x3c/0x380 kernel/time/timer.c:1448
 expire_timers kernel/time/timer.c:1493 [inline]
 __run_timers+0x81d/0xb60 kernel/time/timer.c:1817
 run_timer_softirq+0x6a/0xf0 kernel/time/timer.c:1830
 __do_softirq+0x236/0x660 kernel/softirq.c:292
 invoke_softirq kernel/softirq.c:373 [inline]
 irq_exit+0x197/0x1c0 kernel/softirq.c:413
 exiting_irq arch/x86/include/asm/apic.h:539 [inline]
 smp_apic_timer_interrupt+0x11d/0x490 arch/x86/kernel/apic/apic.c:1161
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:834
 </IRQ>
RIP: 0010:freelist_ptr mm/slub.c:265 [inline]
RIP: 0010:freelist_dereference mm/slub.c:276 [inline]
RIP: 0010:get_freepointer mm/slub.c:282 [inline]
RIP: 0010:get_freepointer_safe mm/slub.c:296 [inline]
RIP: 0010:slab_alloc_node mm/slub.c:2795 [inline]
RIP: 0010:slab_alloc mm/slub.c:2837 [inline]
RIP: 0010:kmem_cache_alloc+0x9a/0x270 mm/slub.c:2842
Code: 4d 85 ff 0f 84 a4 00 00 00 48 83 78 10 00 0f 84 99 00 00 00 41 8b 45 20 49 8d 0c 07 49 8b 9d b0 01 00 00 48 0f c9 49 33 1c 07 <48> 31 cb 48 89 d1 48 83 c1 08 49 8b 7d 00 4c 89 f8 65 48 0f c7 0f
RSP: 0018:ffff8881e468f830 EFLAGS: 00000206 ORIG_RAX: ffffffffffffff13
RAX: 0000000000000000 RBX: 00baaeea8188ffff RCX: 00baaeea8188ffff
RDX: 000000000009ccc0 RSI: 000000000001f762 RDI: 000000000001f763
RBP: ffff8881e468f860 R08: dffffc0000000000 R09: ffffed103d2695e9
R10: ffffed103d2695e9 R11: 1ffff1103d2695e8 R12: ffff8881f1ccc500
R13: ffff8881f1ccc500 R14: 0000000000000a20 R15: ffff8881eaaeba00
 skb_clone+0x1e9/0x380 net/core/skbuff.c:1467
 ____bpf_clone_redirect net/core/filter.c:2136 [inline]
 bpf_clone_redirect+0xa7/0x380 net/core/filter.c:2123
 bpf_prog_2658eab614f371a8+0xf23/0x1000
 bpf_call_func include/linux/filter.h:627 [inline]
 bpf_test_run+0x1ea/0x5d0 net/bpf/test_run.c:44
 bpf_prog_test_run_skb+0x721/0xdc0 net/bpf/test_run.c:311
 bpf_prog_test_run+0x21a/0x2a0 kernel/bpf/syscall.c:2124
 __do_sys_bpf kernel/bpf/syscall.c:2909 [inline]
 __se_sys_bpf+0x49a/0x570 kernel/bpf/syscall.c:2849
 __x64_sys_bpf+0x7b/0x90 kernel/bpf/syscall.c:2849
 do_syscall_64+0xcf/0x170 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x5c/0xc1
RIP: 0033:0x7f5e69c77969
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:00007f5e682e0038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007f5e69e9efa0 RCX: 00007f5e69c77969
RDX: 0000000000000050 RSI: 0000200000001300 RDI: 000000000000000a
RBP: 00007f5e69cf9ab1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f5e69e9efa0 R15: 00007fff139b9968
Modules linked in:
CR2: 0000000000000000
---[ end trace 390e40767d02f3d5 ]---
RIP: 0010:0x0
Code: Bad RIP value.
RSP: 0018:ffff8881f6e09cf0 EFLAGS: 00010202
RAX: ffffffff8150a590 RBX: 0000000000000101 RCX: ffff8881e934af40
RDX: 0000000000000101 RSI: 0000000000000000 RDI: ffff8881ecbdb1c0
RBP: ffff8881f6e09d30 R08: 0000000000000004 R09: 0000000000000003
R10: ffffed103edc1398 R11: 1ffff1103edc1398 R12: 00000000ffffcf98
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8881ecbdb1c0
FS:  00007f5e682e06c0(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 00000001e8bd2000 CR4: 00000000003406b0
DR0: 0000000000000000 DR1: 0000200000000300 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
----------------
Code disassembly (best guess):
   0:	4d 85 ff             	test   %r15,%r15
   3:	0f 84 a4 00 00 00    	je     0xad
   9:	48 83 78 10 00       	cmpq   $0x0,0x10(%rax)
   e:	0f 84 99 00 00 00    	je     0xad
  14:	41 8b 45 20          	mov    0x20(%r13),%eax
  18:	49 8d 0c 07          	lea    (%r15,%rax,1),%rcx
  1c:	49 8b 9d b0 01 00 00 	mov    0x1b0(%r13),%rbx
  23:	48 0f c9             	bswap  %rcx
  26:	49 33 1c 07          	xor    (%r15,%rax,1),%rbx
* 2a:	48 31 cb             	xor    %rcx,%rbx <-- trapping instruction
  2d:	48 89 d1             	mov    %rdx,%rcx
  30:	48 83 c1 08          	add    $0x8,%rcx
  34:	49 8b 7d 00          	mov    0x0(%r13),%rdi
  38:	4c 89 f8             	mov    %r15,%rax
  3b:	65 48 0f c7 0f       	cmpxchg16b %gs:(%rdi)