==================================================================
BUG: KASAN: use-after-free in bq_enqueue kernel/bpf/cpumap.c:749 [inline]
BUG: KASAN: use-after-free in cpu_map_enqueue+0xb4/0x370 kernel/bpf/cpumap.c:775
Read of size 8 at addr ffff88811c0b8c08 by task syz.4.8369/22772

CPU: 0 PID: 22772 Comm: syz.4.8369 Not tainted 6.1.124-syzkaller-00112-g773ad7ab1397 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x151/0x1b7 lib/dump_stack.c:106
 print_address_description mm/kasan/report.c:316 [inline]
 print_report+0x158/0x4e0 mm/kasan/report.c:427
 kasan_report+0x13c/0x170 mm/kasan/report.c:531
 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report_generic.c:351
 bq_enqueue kernel/bpf/cpumap.c:749 [inline]
 cpu_map_enqueue+0xb4/0x370 kernel/bpf/cpumap.c:775
 __xdp_do_redirect_frame net/core/filter.c:4323 [inline]
 xdp_do_redirect_frame+0x275/0x800 net/core/filter.c:4381
 xdp_test_run_batch net/bpf/test_run.c:314 [inline]
 bpf_test_run_xdp_live+0xc30/0x1f70 net/bpf/test_run.c:362
 bpf_prog_test_run_xdp+0x7d1/0x1130 net/bpf/test_run.c:1393
 bpf_prog_test_run+0x3b0/0x630 kernel/bpf/syscall.c:3670
 __sys_bpf+0x59f/0x7f0 kernel/bpf/syscall.c:5025
 __do_sys_bpf kernel/bpf/syscall.c:5111 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:5109 [inline]
 __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5109
 x64_sys_call+0x87f/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:322
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f48d898cda9
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:00007f48d9822038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007f48d8ba5fa0 RCX: 00007f48d898cda9
RDX: 0000000000000050 RSI: 00000000200000c0 RDI: 000000000000000a
RBP: 00007f48d8a0e2a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f48d8ba5fa0 R15: 00007fffbc885ec8
 </TASK>

The buggy address belongs to the physical page:
page:ffffea0004702e00 refcount:0 mapcount:-128 mapping:0000000000000000 index:0x0 pfn:0x11c0b8
flags: 0x4000000000000000(zone=1)
raw: 4000000000000000 ffffea000466b088 ffffea00048aa008 0000000000000000
raw: 0000000000000000 0000000000000001 00000000ffffff7f 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), pid 22322, tgid 22321 (syz.2.8210), ts 822338624985, free_ts 822603110092
 set_page_owner include/linux/page_owner.h:33 [inline]
 post_alloc_hook+0x213/0x220 mm/page_alloc.c:2605
 prep_new_page+0x1b/0x110 mm/page_alloc.c:2612
 get_page_from_freelist+0x2f41/0x2fc0 mm/page_alloc.c:4477
 __alloc_pages+0x234/0x610 mm/page_alloc.c:5775
 __alloc_pages_node include/linux/gfp.h:236 [inline]
 alloc_pages_node include/linux/gfp.h:259 [inline]
 pcpu_alloc_pages mm/percpu-vm.c:95 [inline]
 pcpu_populate_chunk+0x19f/0xc00 mm/percpu-vm.c:285
 pcpu_alloc+0xa24/0x1440 mm/percpu.c:1862
 __alloc_percpu_gfp+0x27/0x30 mm/percpu.c:1937
 bpf_map_alloc_percpu+0xd2/0x2c0 kernel/bpf/syscall.c:498
 prealloc_init+0x238/0x830 kernel/bpf/hashtab.c:328
 htab_map_alloc+0xb1f/0xf80 kernel/bpf/hashtab.c:568
 find_and_alloc_map kernel/bpf/syscall.c:133 [inline]
 map_create+0x44a/0xcf0 kernel/bpf/syscall.c:1123
 __sys_bpf+0x2e6/0x7f0 kernel/bpf/syscall.c:4989
 __do_sys_bpf kernel/bpf/syscall.c:5111 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:5109 [inline]
 __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5109
 x64_sys_call+0x87f/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:322
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:26 [inline]
 free_pages_prepare mm/page_alloc.c:1513 [inline]
 free_pcp_prepare mm/page_alloc.c:1587 [inline]
 free_unref_page_prepare+0x9f1/0xa00 mm/page_alloc.c:3526
 free_unref_page+0xb2/0x5c0 mm/page_alloc.c:3622
 free_the_page mm/page_alloc.c:798 [inline]
 __free_pages+0x61/0xf0 mm/page_alloc.c:5864
 pcpu_free_pages mm/percpu-vm.c:65 [inline]
 pcpu_depopulate_chunk+0x4df/0x5b0 mm/percpu-vm.c:330
 pcpu_reclaim_populated mm/percpu.c:2193 [inline]
 pcpu_balance_workfn+0x2bb/0xe60 mm/percpu.c:2245
 process_one_work+0x73d/0xcb0 kernel/workqueue.c:2299
 worker_thread+0xa60/0x1260 kernel/workqueue.c:2446
 kthread+0x26d/0x300 kernel/kthread.c:386
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295

Memory state around the buggy address:
 ffff88811c0b8b00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88811c0b8b80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff88811c0b8c00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                      ^
 ffff88811c0b8c80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88811c0b8d00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================
general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
CPU: 0 PID: 22772 Comm: syz.4.8369 Tainted: G    B              6.1.124-syzkaller-00112-g773ad7ab1397 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
RIP: 0010:bq_flush_to_queue+0x47/0x6e0 kernel/bpf/cpumap.c:713
Code: df e8 ad 64 dd ff 49 8d 5f 50 48 89 d8 48 c1 e8 03 42 80 3c 20 00 74 08 48 89 df e8 d3 ea 24 00 48 8b 1b 48 89 d8 48 c1 e8 03 <42> 0f b6 04 20 84 c0 0f 85 cd 04 00 00 48 89 5d 80 44 8b 33 4d 8d
RSP: 0018:ffffc900010775d8 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000080000
RDX: ffffc90004395000 RSI: 000000000001e6bd RDI: 000000000001e6be
RBP: ffffc90001077668 R08: ffffffff81982ee8 R09: 0000000000000003
R10: ffffffffffffffff R11: dffffc0000000001 R12: dffffc0000000000
R13: ffff8881f6e34440 R14: ffff8881f6e34440 R15: ffff8881f6e00000
FS:  00007f48d98226c0(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 000000012a123000 CR4: 00000000003506b0
DR0: 0000000020000300 DR1: 0000000020000300 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <TASK>
 __cpu_map_flush+0xab/0x130 kernel/bpf/cpumap.c:804
 xdp_do_flush+0x13/0x20 net/core/filter.c:4208
 xdp_test_run_batch net/bpf/test_run.c:332 [inline]
 bpf_test_run_xdp_live+0x167d/0x1f70 net/bpf/test_run.c:362
 bpf_prog_test_run_xdp+0x7d1/0x1130 net/bpf/test_run.c:1393
 bpf_prog_test_run+0x3b0/0x630 kernel/bpf/syscall.c:3670
 __sys_bpf+0x59f/0x7f0 kernel/bpf/syscall.c:5025
 __do_sys_bpf kernel/bpf/syscall.c:5111 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:5109 [inline]
 __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5109
 x64_sys_call+0x87f/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:322
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f48d898cda9
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:00007f48d9822038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007f48d8ba5fa0 RCX: 00007f48d898cda9
RDX: 0000000000000050 RSI: 00000000200000c0 RDI: 000000000000000a
RBP: 00007f48d8a0e2a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f48d8ba5fa0 R15: 00007fffbc885ec8
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:bq_flush_to_queue+0x47/0x6e0 kernel/bpf/cpumap.c:713
Code: df e8 ad 64 dd ff 49 8d 5f 50 48 89 d8 48 c1 e8 03 42 80 3c 20 00 74 08 48 89 df e8 d3 ea 24 00 48 8b 1b 48 89 d8 48 c1 e8 03 <42> 0f b6 04 20 84 c0 0f 85 cd 04 00 00 48 89 5d 80 44 8b 33 4d 8d
RSP: 0018:ffffc900010775d8 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000080000
RDX: ffffc90004395000 RSI: 000000000001e6bd RDI: 000000000001e6be
RBP: ffffc90001077668 R08: ffffffff81982ee8 R09: 0000000000000003
R10: ffffffffffffffff R11: dffffc0000000001 R12: dffffc0000000000
R13: ffff8881f6e34440 R14: ffff8881f6e34440 R15: ffff8881f6e00000
FS:  00007f48d98226c0(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 000000012a123000 CR4: 00000000003506b0
DR0: 0000000020000300 DR1: 0000000020000300 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
----------------
Code disassembly (best guess):
   0:	df e8                	fucomip %st(0),%st
   2:	ad                   	lods   %ds:(%rsi),%eax
   3:	64 dd ff             	fs (bad)
   6:	49 8d 5f 50          	lea    0x50(%r15),%rbx
   a:	48 89 d8             	mov    %rbx,%rax
   d:	48 c1 e8 03          	shr    $0x3,%rax
  11:	42 80 3c 20 00       	cmpb   $0x0,(%rax,%r12,1)
  16:	74 08                	je     0x20
  18:	48 89 df             	mov    %rbx,%rdi
  1b:	e8 d3 ea 24 00       	call   0x24eaf3
  20:	48 8b 1b             	mov    (%rbx),%rbx
  23:	48 89 d8             	mov    %rbx,%rax
  26:	48 c1 e8 03          	shr    $0x3,%rax
* 2a:	42 0f b6 04 20       	movzbl (%rax,%r12,1),%eax <-- trapping instruction
  2f:	84 c0                	test   %al,%al
  31:	0f 85 cd 04 00 00    	jne    0x504
  37:	48 89 5d 80          	mov    %rbx,-0x80(%rbp)
  3b:	44 8b 33             	mov    (%rbx),%r14d
  3e:	4d                   	rex.WRB
  3f:	8d                   	.byte 0x8d