==================================================================
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 ffff88811981b708 by task syz.3.1821/6604

CPU: 0 PID: 6604 Comm: syz.3.1821 Not tainted 6.1.118-syzkaller-00074-g3e3f2b9e9fca #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/25/2024
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:4300 [inline]
 xdp_do_redirect_frame+0x275/0x800 net/core/filter.c:4358
 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:3665
 __sys_bpf+0x59f/0x7f0 kernel/bpf/syscall.c:5020
 __do_sys_bpf kernel/bpf/syscall.c:5106 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:5104 [inline]
 __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5104
 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: 0033:0x7f70b1f85d29
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:00007f70b2cfc038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007f70b2175fa0 RCX: 00007f70b1f85d29
RDX: 0000000000000050 RSI: 00000000200000c0 RDI: 000000000000000a
RBP: 00007f70b2001aa8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f70b2175fa0 R15: 00007fff4ee67828
 </TASK>

Allocated by task 5737:
 kasan_save_stack mm/kasan/common.c:45 [inline]
 kasan_set_track+0x4b/0x70 mm/kasan/common.c:52
 kasan_save_alloc_info+0x1f/0x30 mm/kasan/generic.c:505
 __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:333
 kasan_slab_alloc include/linux/kasan.h:202 [inline]
 slab_post_alloc_hook+0x53/0x2c0 mm/slab.h:768
 slab_alloc_node mm/slub.c:3421 [inline]
 slab_alloc mm/slub.c:3431 [inline]
 __kmem_cache_alloc_lru mm/slub.c:3438 [inline]
 kmem_cache_alloc+0x175/0x320 mm/slub.c:3447
 __sigqueue_alloc+0x138/0x210 kernel/signal.c:440
 __send_signal_locked+0x1a3/0xc30 kernel/signal.c:1138
 send_signal_locked+0x43a/0x590 kernel/signal.c:1267
 do_send_sig_info+0xde/0x230 kernel/signal.c:1310
 group_send_sig_info+0x113/0x320 kernel/signal.c:1459
 bpf_send_signal_common+0x2d8/0x420 kernel/trace/bpf_trace.c:882
 ____bpf_send_signal kernel/trace/bpf_trace.c:887 [inline]
 bpf_send_signal+0x19/0x20 kernel/trace/bpf_trace.c:885
 0xffffffffa00008ed
 bpf_dispatcher_nop_func include/linux/bpf.h:987 [inline]
 __bpf_prog_run include/linux/filter.h:603 [inline]
 bpf_prog_run include/linux/filter.h:610 [inline]
 __bpf_trace_run kernel/trace/bpf_trace.c:2271 [inline]
 bpf_trace_run2+0x133/0x290 kernel/trace/bpf_trace.c:2310
 __bpf_trace_sys_exit+0x62/0x70 include/trace/events/syscalls.h:44
 trace_sys_exit include/trace/events/syscalls.h:44 [inline]
 syscall_exit_work kernel/entry/common.c:254 [inline]
 syscall_exit_to_user_mode_prepare kernel/entry/common.c:285 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:290 [inline]
 syscall_exit_to_user_mode+0x114/0x130 kernel/entry/common.c:303
 do_syscall_64+0x47/0xb0 arch/x86/entry/common.c:87
 entry_SYSCALL_64_after_hwframe+0x68/0xd2

Freed by task 5737:
 kasan_save_stack mm/kasan/common.c:45 [inline]
 kasan_set_track+0x4b/0x70 mm/kasan/common.c:52
 kasan_save_free_info+0x2b/0x40 mm/kasan/generic.c:516
 ____kasan_slab_free+0x131/0x180 mm/kasan/common.c:241
 __kasan_slab_free+0x11/0x20 mm/kasan/common.c:249
 kasan_slab_free include/linux/kasan.h:178 [inline]
 slab_free_hook mm/slub.c:1745 [inline]
 slab_free_freelist_hook mm/slub.c:1771 [inline]
 slab_free mm/slub.c:3686 [inline]
 kmem_cache_free+0x291/0x560 mm/slub.c:3711
 __sigqueue_free kernel/signal.c:463 [inline]
 collect_signal kernel/signal.c:606 [inline]
 __dequeue_signal+0x519/0x650 kernel/signal.c:628
 dequeue_signal+0x165/0x590 kernel/signal.c:651
 signalfd_dequeue fs/signalfd.c:163 [inline]
 signalfd_read+0x3af/0x1510 fs/signalfd.c:217
 vfs_read+0x26c/0xae0 fs/read_write.c:468
 ksys_read+0x199/0x2c0 fs/read_write.c:613
 __do_sys_read fs/read_write.c:623 [inline]
 __se_sys_read fs/read_write.c:621 [inline]
 __x64_sys_read+0x7b/0x90 fs/read_write.c:621
 x64_sys_call+0x28/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:1
 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

The buggy address belongs to the object at ffff88811981b700
 which belongs to the cache sigqueue of size 80
The buggy address is located 8 bytes inside of
 80-byte region [ffff88811981b700, ffff88811981b750)

The buggy address belongs to the physical page:
page:ffffea00046606c0 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x11981b
flags: 0x4000000000000200(slab|zone=1)
raw: 4000000000000200 0000000000000000 dead000000000122 ffff8881002aaf00
raw: 0000000000000000 0000000000240024 00000001ffffffff 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 0x112a20(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_HARDWALL), pid 5737, tgid 5737 (udevd), ts 224872231502, free_ts 224793036341
 set_page_owner include/linux/page_owner.h:33 [inline]
 post_alloc_hook+0x213/0x220 mm/page_alloc.c:2590
 prep_new_page+0x1b/0x110 mm/page_alloc.c:2597
 get_page_from_freelist+0x2f41/0x2fc0 mm/page_alloc.c:4462
 __alloc_pages+0x234/0x610 mm/page_alloc.c:5759
 alloc_slab_page+0x6c/0xf0
 allocate_slab mm/slub.c:1962 [inline]
 new_slab+0x90/0x3e0 mm/slub.c:2015
 ___slab_alloc+0x6f9/0xb80 mm/slub.c:3203
 __slab_alloc+0x5d/0xa0 mm/slub.c:3302
 slab_alloc_node mm/slub.c:3387 [inline]
 slab_alloc mm/slub.c:3431 [inline]
 __kmem_cache_alloc_lru mm/slub.c:3438 [inline]
 kmem_cache_alloc+0x1be/0x320 mm/slub.c:3447
 __sigqueue_alloc+0x138/0x210 kernel/signal.c:440
 __send_signal_locked+0x1a3/0xc30 kernel/signal.c:1138
 send_signal_locked+0x43a/0x590 kernel/signal.c:1267
 do_send_sig_info+0xde/0x230 kernel/signal.c:1310
 group_send_sig_info+0x113/0x320 kernel/signal.c:1459
 bpf_send_signal_common+0x2d8/0x420 kernel/trace/bpf_trace.c:882
 ____bpf_send_signal kernel/trace/bpf_trace.c:887 [inline]
 bpf_send_signal+0x19/0x20 kernel/trace/bpf_trace.c:885
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:26 [inline]
 free_pages_prepare mm/page_alloc.c:1498 [inline]
 free_pcp_prepare mm/page_alloc.c:1572 [inline]
 free_unref_page_prepare+0x83d/0x850 mm/page_alloc.c:3511
 free_unref_page_list+0xf1/0x7b0 mm/page_alloc.c:3659
 release_pages+0xf7f/0xfe0 mm/swap.c:1063
 free_pages_and_swap_cache+0x8a/0xa0 mm/swap_state.c:315
 tlb_batch_pages_flush mm/mmu_gather.c:59 [inline]
 tlb_flush_mmu_free mm/mmu_gather.c:254 [inline]
 tlb_flush_mmu mm/mmu_gather.c:261 [inline]
 tlb_finish_mmu+0x1e0/0x3f0 mm/mmu_gather.c:361
 exit_mmap+0x460/0xbe0 mm/mmap.c:3348
 __mmput+0x95/0x310 kernel/fork.c:1299
 mmput+0x56/0x170 kernel/fork.c:1322
 exit_mm kernel/exit.c:568 [inline]
 do_exit+0xb29/0x2b80 kernel/exit.c:864
 do_group_exit+0x21a/0x2d0 kernel/exit.c:1027
 get_signal+0x169d/0x1820 kernel/signal.c:2889
 arch_do_signal_or_restart+0xb0/0x16f0 arch/x86/kernel/signal.c:871
 exit_to_user_mode_loop+0x74/0xa0 kernel/entry/common.c:174
 exit_to_user_mode_prepare+0x5a/0xa0 kernel/entry/common.c:210
 __syscall_exit_to_user_mode_work kernel/entry/common.c:292 [inline]
 syscall_exit_to_user_mode+0x26/0x130 kernel/entry/common.c:303
 do_syscall_64+0x47/0xb0 arch/x86/entry/common.c:87

Memory state around the buggy address:
 ffff88811981b600: fc fc fc fc fa fb fb fb fb fb fb fb fb fb fc fc
 ffff88811981b680: fc fc fa fb fb fb fb fb fb fb fb fb fc fc fc fc
>ffff88811981b700: fa fb fb fb fb fb fb fb fb fb fc fc fc fc fa fb
                      ^
 ffff88811981b780: fb fb fb fb fb fb fb fb fc fc fc fc fa fb fb fb
 ffff88811981b800: fb fb fb fb fb fb fc fc fc fc fa fb fb fb fb fb
==================================================================
general protection fault, probably for non-canonical address 0xe0ac0d2f9edc02d8: 0000 [#1] PREEMPT SMP KASAN
KASAN: maybe wild-memory-access in range [0x0560897cf6e016c0-0x0560897cf6e016c7]
CPU: 0 PID: 6604 Comm: syz.3.1821 Tainted: G    B              6.1.118-syzkaller-00074-g3e3f2b9e9fca #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/25/2024
RIP: 0010:bq_enqueue kernel/bpf/cpumap.c:751 [inline]
RIP: 0010:cpu_map_enqueue+0x113/0x370 kernel/bpf/cpumap.c:775
Code: e8 03 42 80 3c 30 00 74 08 48 89 df e8 86 ee 24 00 4c 8b 23 4f 8d 74 3c 58 4d 89 f5 49 c1 ed 03 48 b8 00 00 00 00 00 fc ff df <41> 0f b6 44 05 00 84 c0 0f 85 a8 01 00 00 4d 01 fc 41 8b 1e bf 08
RSP: 0018:ffffc9000078f600 EFLAGS: 00010206
RAX: dffffc0000000000 RBX: ffffffff8674a890 RCX: 0000000000080000
RDX: ffffc90001511000 RSI: 000000000002c2d5 RDI: 000000000002c2d6
RBP: ffffc9000078f638 R08: ffffffff81980b5e R09: fffffbfff0f6e2fd
R10: 0000000000000000 R11: dffffc0000000001 R12: ffff8881f6e00000
R13: 00ac112f9edc02d8 R14: 0560897cf6e016c1 R15: 056100fb00001669
FS:  00007f70b2cfc6c0(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000508f0000 CR3: 0000000135f14000 CR4: 00000000003506b0
DR0: 0000000000008000 DR1: 0000000000000000 DR2: ffff8880b8927a20
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <TASK>
 __xdp_do_redirect_frame net/core/filter.c:4300 [inline]
 xdp_do_redirect_frame+0x275/0x800 net/core/filter.c:4358
 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:3665
 __sys_bpf+0x59f/0x7f0 kernel/bpf/syscall.c:5020
 __do_sys_bpf kernel/bpf/syscall.c:5106 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:5104 [inline]
 __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5104
 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: 0033:0x7f70b1f85d29
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:00007f70b2cfc038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007f70b2175fa0 RCX: 00007f70b1f85d29
RDX: 0000000000000050 RSI: 00000000200000c0 RDI: 000000000000000a
RBP: 00007f70b2001aa8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f70b2175fa0 R15: 00007fff4ee67828
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:bq_enqueue kernel/bpf/cpumap.c:751 [inline]
RIP: 0010:cpu_map_enqueue+0x113/0x370 kernel/bpf/cpumap.c:775
Code: e8 03 42 80 3c 30 00 74 08 48 89 df e8 86 ee 24 00 4c 8b 23 4f 8d 74 3c 58 4d 89 f5 49 c1 ed 03 48 b8 00 00 00 00 00 fc ff df <41> 0f b6 44 05 00 84 c0 0f 85 a8 01 00 00 4d 01 fc 41 8b 1e bf 08
RSP: 0018:ffffc9000078f600 EFLAGS: 00010206
RAX: dffffc0000000000 RBX: ffffffff8674a890 RCX: 0000000000080000
RDX: ffffc90001511000 RSI: 000000000002c2d5 RDI: 000000000002c2d6
RBP: ffffc9000078f638 R08: ffffffff81980b5e R09: fffffbfff0f6e2fd
R10: 0000000000000000 R11: dffffc0000000001 R12: ffff8881f6e00000
R13: 00ac112f9edc02d8 R14: 0560897cf6e016c1 R15: 056100fb00001669
FS:  00007f70b2cfc6c0(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000508f0000 CR3: 0000000135f14000 CR4: 00000000003506b0
DR0: 0000000000008000 DR1: 0000000000000000 DR2: ffff8880b8927a20
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
----------------
Code disassembly (best guess):
   0:	e8 03 42 80 3c       	call   0x3c804208
   5:	30 00                	xor    %al,(%rax)
   7:	74 08                	je     0x11
   9:	48 89 df             	mov    %rbx,%rdi
   c:	e8 86 ee 24 00       	call   0x24ee97
  11:	4c 8b 23             	mov    (%rbx),%r12
  14:	4f 8d 74 3c 58       	lea    0x58(%r12,%r15,1),%r14
  19:	4d 89 f5             	mov    %r14,%r13
  1c:	49 c1 ed 03          	shr    $0x3,%r13
  20:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  27:	fc ff df
* 2a:	41 0f b6 44 05 00    	movzbl 0x0(%r13,%rax,1),%eax <-- trapping instruction
  30:	84 c0                	test   %al,%al
  32:	0f 85 a8 01 00 00    	jne    0x1e0
  38:	4d 01 fc             	add    %r15,%r12
  3b:	41 8b 1e             	mov    (%r14),%ebx
  3e:	bf                   	.byte 0xbf
  3f:	08                   	.byte 0x8