==================================================================
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 ffff8881e5b3b1c8 by task syz.1.434/1580

CPU: 1 PID: 1580 Comm: syz.1.434 Not tainted 5.4.276-syzkaller-00021-g58de09405d1e #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:__orc_find arch/x86/kernel/unwind_orc.c:47 [inline]
RIP: 0010:orc_find arch/x86/kernel/unwind_orc.c:175 [inline]
RIP: 0010:unwind_next_frame+0x5df/0x1ea0 arch/x86/kernel/unwind_orc.c:438
Code: 00 48 8b 84 24 80 01 00 00 e9 8e 08 00 00 a9 00 04 00 00 0f 84 1e 12 00 00 e9 41 12 00 00 49 89 d6 49 89 d5 4c 89 f8 4c 29 e8 <48> 89 c1 48 c1 f9 02 48 c1 e8 3f 48 01 c8 48 83 e0 fe 49 8d 5c 45
RSP: 0018:ffff8881e2d1e940 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: 0000000000000000 RBX: ffffffff86559904 RCX: ffffffff86559908
RDX: ffffffff86559900 RSI: ffffffff8682b1d2 RDI: ffffffff812fbc9c
RBP: ffff8881e2d1ec30 R08: 0000000000000011 R09: ffff8881e2d1ec90
R10: 0000000000000000 R11: dffffc0000000001 R12: ffffffff81881130
R13: ffffffff86559900 R14: ffffffff86559900 R15: ffffffff86559900
 arch_stack_walk+0x111/0x140 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0x118/0x1c0 kernel/stacktrace.c:123
 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]
 __kmalloc_track_caller+0x100/0x2b0 mm/slub.c:4449
 __do_krealloc mm/slab_common.c:1690 [inline]
 krealloc+0x91/0xe0 mm/slab_common.c:1741
 push_jmp_history kernel/bpf/verifier.c:1415 [inline]
 is_state_visited kernel/bpf/verifier.c:7681 [inline]
 do_check+0x29a6/0x9820 kernel/bpf/verifier.c:7837
 bpf_check+0x2169/0xb340 kernel/bpf/verifier.c:9637
 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
RIP: 0033:0x7fcd91905b99
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:00007fcd90b87048 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007fcd91a93f60 RCX: 00007fcd91905b99
RDX: 0000000000000048 RSI: 00000000200054c0 RDI: 0000000000000005
RBP: 00007fcd91974a7a R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007fcd91a93f60 R15: 00007ffda7dead98

The buggy address belongs to the page:
page:ffffea000796cec0 refcount:0 mapcount:0 mapping:0000000000000000 index:0x0
flags: 0x8000000000000000()
raw: 8000000000000000 dead000000000100 dead000000000122 0000000000000000
raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as freed
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x102cc2(GFP_HIGHUSER|__GFP_NOWARN)
 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_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]
 pcpu_alloc_pages mm/percpu-vm.c:94 [inline]
 pcpu_populate_chunk+0x1bb/0xd00 mm/percpu-vm.c:284
 pcpu_alloc+0x79e/0x1050 mm/percpu.c:1714
 prealloc_init+0x238/0x800 kernel/bpf/hashtab.c:154
 htab_map_alloc+0x638/0x930 kernel/bpf/hashtab.c:382
 find_and_alloc_map kernel/bpf/syscall.c:122 [inline]
 map_create kernel/bpf/syscall.c:573 [inline]
 __do_sys_bpf kernel/bpf/syscall.c:2873 [inline]
 __se_sys_bpf+0x3291/0xbcb0 kernel/bpf/syscall.c:2849
 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_pcp_prepare mm/page_alloc.c:1233 [inline]
 free_unref_page_prepare+0x297/0x380 mm/page_alloc.c:3085
 free_unref_page mm/page_alloc.c:3134 [inline]
 free_the_page mm/page_alloc.c:4953 [inline]
 __free_pages+0xaf/0x140 mm/page_alloc.c:4961
 pcpu_free_pages mm/percpu-vm.c:64 [inline]
 pcpu_depopulate_chunk mm/percpu-vm.c:328 [inline]
 pcpu_balance_workfn+0x940/0x1450 mm/percpu.c:1865
 process_one_work+0x765/0xd20 kernel/workqueue.c:2290
 worker_thread+0xaef/0x1470 kernel/workqueue.c:2436
 kthread+0x2da/0x360 kernel/kthread.c:288
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:354

Memory state around the buggy address:
 ffff8881e5b3b080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff8881e5b3b100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff8881e5b3b180: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                                              ^
 ffff8881e5b3b200: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff8881e5b3b280: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================
BUG: kernel NULL pointer dereference, address: 0000000000000000
#PF: supervisor instruction fetch in kernel mode
#PF: error_code(0x0010) - not-present page
PGD 1e6530067 P4D 1e6530067 PUD 1dc75c067 PMD 0 
Oops: 0010 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 1558 Comm: syz.3.428 Tainted: G    B             5.4.276-syzkaller-00021-g58de09405d1e #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024
RIP: 0010:0x0
Code: Bad RIP value.
RSP: 0000:ffff8881f6f09d18 EFLAGS: 00010206
RAX: ffffffff8154d48a RBX: 0000000000000100 RCX: ffff8881e0441f80
RDX: 0000000080000100 RSI: 0000000000000000 RDI: ffff8881e5b3b1c0
RBP: ffff8881f6f09ec8 R08: ffffffff8154d0ce R09: 0000000000000003
R10: ffffffffffffffff R11: dffffc0000000001 R12: 00000000ffff97b8
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8881e5b3b1c0
FS:  000055555644e500(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 00000001ec973000 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: 0033:0x7f5e58bae975
Code: 72 f3 48 83 e8 08 48 39 f2 73 17 66 2e 0f 1f 84 00 00 00 00 00 48 8b 70 f8 48 83 e8 08 48 39 f2 72 f3 48 39 c3 73 3e 48 89 33 <48> 83 c3 08 48 8b 70 f8 48 89 08 48 8b 0b 49 8b 14 24 eb bf 48 39
RSP: 002b:00007fff44bb3a80 EFLAGS: 00000287 ORIG_RAX: ffffffffffffff13
RAX: 00007f5e58718100 RBX: 00007f5e5858c7f0 RCX: ffffffff82316a23
RDX: ffffffff82316a23 RSI: ffffffff823168b5 RDI: 00007f5e587259a0
RBP: 00007f5e58567ef0 R08: 00007f5e58646c40 R09: 00007f5e58561000
R10: 0000000000000008 R11: 000000008100649a R12: 00007f5e58567ee8
R13: 0000000000000020 R14: 00007f5e58561008 R15: 00007f5e58e65f60
Modules linked in:
CR2: 0000000000000000
---[ end trace 964372529c8c56db ]---
RIP: 0010:0x0
Code: Bad RIP value.
RSP: 0000:ffff8881f6f09d18 EFLAGS: 00010206
RAX: ffffffff8154d48a RBX: 0000000000000100 RCX: ffff8881e0441f80
RDX: 0000000080000100 RSI: 0000000000000000 RDI: ffff8881e5b3b1c0
RBP: ffff8881f6f09ec8 R08: ffffffff8154d0ce R09: 0000000000000003
R10: ffffffffffffffff R11: dffffc0000000001 R12: 00000000ffff97b8
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8881e5b3b1c0
FS:  000055555644e500(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 00000001ec973000 CR4: 00000000003406a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	00 48 8b             	add    %cl,-0x75(%rax)
   3:	84 24 80             	test   %ah,(%rax,%rax,4)
   6:	01 00                	add    %eax,(%rax)
   8:	00 e9                	add    %ch,%cl
   a:	8e 08                	mov    (%rax),%cs
   c:	00 00                	add    %al,(%rax)
   e:	a9 00 04 00 00       	test   $0x400,%eax
  13:	0f 84 1e 12 00 00    	je     0x1237
  19:	e9 41 12 00 00       	jmp    0x125f
  1e:	49 89 d6             	mov    %rdx,%r14
  21:	49 89 d5             	mov    %rdx,%r13
  24:	4c 89 f8             	mov    %r15,%rax
  27:	4c 29 e8             	sub    %r13,%rax
* 2a:	48 89 c1             	mov    %rax,%rcx <-- trapping instruction
  2d:	48 c1 f9 02          	sar    $0x2,%rcx
  31:	48 c1 e8 3f          	shr    $0x3f,%rax
  35:	48 01 c8             	add    %rcx,%rax
  38:	48 83 e0 fe          	and    $0xfffffffffffffffe,%rax
  3c:	49                   	rex.WB
  3d:	8d                   	.byte 0x8d
  3e:	5c                   	pop    %rsp
  3f:	45                   	rex.RB