==================================================================
BUG: KASAN: use-after-free in cpu_map_generic_redirect+0x171/0x670 kernel/bpf/cpumap.c:786
Read of size 8 at addr ffff88810c22cb18 by task kworker/1:3/386

CPU: 1 PID: 386 Comm: kworker/1:3 Not tainted 5.15.180-syzkaller-00024-g88c4075c39ed #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/19/2025
Workqueue: wg-crypt-wg0 wg_packet_tx_worker
Call Trace:
 <IRQ>
 __dump_stack+0x21/0x30 lib/dump_stack.c:88
 dump_stack_lvl+0xee/0x150 lib/dump_stack.c:106
 print_address_description+0x7f/0x2c0 mm/kasan/report.c:248
 __kasan_report mm/kasan/report.c:427 [inline]
 kasan_report+0xf1/0x140 mm/kasan/report.c:444
 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report_generic.c:309
 cpu_map_generic_redirect+0x171/0x670 kernel/bpf/cpumap.c:786
 xdp_do_generic_redirect_map net/core/filter.c:4189 [inline]
 xdp_do_generic_redirect+0x3be/0xa80 net/core/filter.c:4236
 do_xdp_generic+0x516/0x7a0 net/core/dev.c:4950
 __netif_receive_skb_core+0x12ac/0x2f10 net/core/dev.c:5355
 __netif_receive_skb_one_core net/core/dev.c:5530 [inline]
 __netif_receive_skb+0x72/0x280 net/core/dev.c:5646
 process_backlog+0x368/0x600 net/core/dev.c:6523
 __napi_poll+0xbe/0x590 net/core/dev.c:7082
 napi_poll net/core/dev.c:7149 [inline]
 net_rx_action+0x371/0x8e0 net/core/dev.c:7239
 handle_softirqs+0x250/0x560 kernel/softirq.c:565
 __do_softirq+0xb/0xd kernel/softirq.c:603
 do_softirq+0xc6/0x120 kernel/softirq.c:452
 </IRQ>
 <TASK>
 __local_bh_enable_ip+0x75/0x80 kernel/softirq.c:379
 __raw_read_unlock_bh include/linux/rwlock_api_smp.h:251 [inline]
 _raw_read_unlock_bh+0x29/0x30 kernel/locking/spinlock.c:284
 wg_socket_send_skb_to_peer+0x172/0x1d0 drivers/net/wireguard/socket.c:184
 wg_packet_create_data_done drivers/net/wireguard/send.c:251 [inline]
 wg_packet_tx_worker+0x1bf/0x480 drivers/net/wireguard/send.c:276
 process_one_work+0x6be/0xba0 kernel/workqueue.c:2325
 worker_thread+0xa59/0x1200 kernel/workqueue.c:2472
 kthread+0x411/0x500 kernel/kthread.c:337
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
 </TASK>

Allocated by task 2796:
 kasan_save_stack mm/kasan/common.c:38 [inline]
 kasan_set_track mm/kasan/common.c:45 [inline]
 set_alloc_info mm/kasan/common.c:433 [inline]
 ____kasan_kmalloc mm/kasan/common.c:512 [inline]
 __kasan_kmalloc+0xda/0x110 mm/kasan/common.c:521
 kasan_kmalloc include/linux/kasan.h:227 [inline]
 __kmalloc+0x13d/0x2c0 mm/slub.c:4431
 __kmalloc_node include/linux/slab.h:484 [inline]
 kmalloc_node include/linux/slab.h:639 [inline]
 bpf_map_kmalloc_node+0xb9/0x140 kernel/bpf/syscall.c:432
 __cpu_map_entry_alloc kernel/bpf/cpumap.c:442 [inline]
 cpu_map_update_elem+0x1e5/0xd50 kernel/bpf/cpumap.c:600
 bpf_map_update_value+0x193/0x3e0 kernel/bpf/syscall.c:186
 map_update_elem+0x5bb/0x740 kernel/bpf/syscall.c:1165
 __sys_bpf+0x40c/0x730 kernel/bpf/syscall.c:4618
 __do_sys_bpf kernel/bpf/syscall.c:4734 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:4732 [inline]
 __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:4732
 x64_sys_call+0x4b9/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:322
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0

Freed by task 2797:
 kasan_save_stack mm/kasan/common.c:38 [inline]
 kasan_set_track+0x4a/0x70 mm/kasan/common.c:45
 kasan_set_free_info+0x23/0x40 mm/kasan/generic.c:370
 ____kasan_slab_free+0x125/0x160 mm/kasan/common.c:365
 __kasan_slab_free+0x11/0x20 mm/kasan/common.c:373
 kasan_slab_free include/linux/kasan.h:193 [inline]
 slab_free_hook mm/slub.c:1723 [inline]
 slab_free_freelist_hook+0xc2/0x190 mm/slub.c:1749
 slab_free mm/slub.c:3521 [inline]
 kfree+0xc4/0x270 mm/slub.c:4583
 put_cpu_map_entry+0x67a/0x6f0 kernel/bpf/cpumap.c:160
 cpu_map_kthread_run+0x1c87/0x1d40 kernel/bpf/cpumap.c:407
 kthread+0x411/0x500 kernel/kthread.c:337
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287

Last potentially related work creation:
 kasan_save_stack+0x3a/0x60 mm/kasan/common.c:38
 __kasan_record_aux_stack+0xd2/0x100 mm/kasan/generic.c:348
 kasan_record_aux_stack_noalloc+0xb/0x10 mm/kasan/generic.c:358
 insert_work+0x51/0x310 kernel/workqueue.c:1373
 __queue_work+0x8e5/0xc60 kernel/workqueue.c:1539
 queue_work_on+0xd2/0x140 kernel/workqueue.c:1566
 queue_work include/linux/workqueue.h:510 [inline]
 schedule_work include/linux/workqueue.h:571 [inline]
 __cpu_map_entry_replace kernel/bpf/cpumap.c:555 [inline]
 cpu_map_free+0x1d1/0x2a0 kernel/bpf/cpumap.c:638
 bpf_map_free_deferred+0x10e/0x1e0 kernel/bpf/syscall.c:481
 process_one_work+0x6be/0xba0 kernel/workqueue.c:2325
 worker_thread+0xa59/0x1200 kernel/workqueue.c:2472
 kthread+0x411/0x500 kernel/kthread.c:337
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287

Second to last potentially related work creation:
 kasan_save_stack+0x3a/0x60 mm/kasan/common.c:38
 __kasan_record_aux_stack+0xd2/0x100 mm/kasan/generic.c:348
 kasan_record_aux_stack_noalloc+0xb/0x10 mm/kasan/generic.c:358
 __call_rcu_common kernel/rcu/tree.c:3007 [inline]
 call_rcu+0xf6/0xf60 kernel/rcu/tree.c:3125
 __cpu_map_entry_replace kernel/bpf/cpumap.c:553 [inline]
 cpu_map_free+0x104/0x2a0 kernel/bpf/cpumap.c:638
 bpf_map_free_deferred+0x10e/0x1e0 kernel/bpf/syscall.c:481
 process_one_work+0x6be/0xba0 kernel/workqueue.c:2325
 worker_thread+0xa59/0x1200 kernel/workqueue.c:2472
 kthread+0x411/0x500 kernel/kthread.c:337
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287

The buggy address belongs to the object at ffff88810c22cb00
 which belongs to the cache kmalloc-192 of size 192
The buggy address is located 24 bytes inside of
 192-byte region [ffff88810c22cb00, ffff88810c22cbc0)
The buggy address belongs to the page:
page:ffffea0004308b00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10c22c
flags: 0x4000000000000200(slab|zone=1)
raw: 4000000000000200 ffffea0004bc5000 0000000200000002 ffff888100042c00
raw: 0000000000000000 0000000000100010 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 0x12cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY), pid 1, ts 2745855543, free_ts 2725848892
 set_page_owner include/linux/page_owner.h:33 [inline]
 post_alloc_hook+0x192/0x1b0 mm/page_alloc.c:2605
 prep_new_page+0x1c/0x110 mm/page_alloc.c:2611
 get_page_from_freelist+0x2cc5/0x2d50 mm/page_alloc.c:4485
 __alloc_pages+0x18f/0x440 mm/page_alloc.c:5781
 alloc_slab_page mm/slub.c:-1 [inline]
 allocate_slab mm/slub.c:1932 [inline]
 new_slab+0xa1/0x4d0 mm/slub.c:1995
 ___slab_alloc+0x381/0x810 mm/slub.c:3028
 __slab_alloc+0x49/0x90 mm/slub.c:3115
 slab_alloc_node mm/slub.c:3206 [inline]
 slab_alloc mm/slub.c:3250 [inline]
 kmem_cache_alloc_trace+0x146/0x270 mm/slub.c:3267
 kmalloc include/linux/slab.h:616 [inline]
 kzalloc include/linux/slab.h:747 [inline]
 alloc_fs_context+0x64/0x7a0 fs/fs_context.c:257
 fs_context_for_reconfigure+0x73/0x80 fs/fs_context.c:313
 reconfigure_single+0x48/0xb0 fs/super.c:1467
 public_dev_mount+0x73/0xe0 drivers/base/devtmpfs.c:66
 legacy_get_tree+0xed/0x190 fs/fs_context.c:611
 vfs_get_tree+0x89/0x260 fs/super.c:1530
 do_new_mount+0x25a/0xa20 fs/namespace.c:3012
 path_mount+0x675/0x1020 fs/namespace.c:3342
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:26 [inline]
 free_pages_prepare mm/page_alloc.c:1472 [inline]
 free_pcp_prepare mm/page_alloc.c:1544 [inline]
 free_unref_page_prepare+0x542/0x550 mm/page_alloc.c:3534
 free_unref_page+0xa2/0x550 mm/page_alloc.c:3616
 free_the_page mm/page_alloc.c:805 [inline]
 __free_pages+0x6c/0x100 mm/page_alloc.c:5857
 free_pages+0x82/0x90 mm/page_alloc.c:5868
 ext4_calculate_overhead+0x1071/0x1260 fs/ext4/super.c:3821
 ext4_fill_super+0x6e79/0x9030 fs/ext4/super.c:4810
 mount_bdev+0x2ae/0x3e0 fs/super.c:1400
 ext4_mount+0x34/0x40 fs/ext4/super.c:6601
 legacy_get_tree+0xed/0x190 fs/fs_context.c:611
 vfs_get_tree+0x89/0x260 fs/super.c:1530
 do_new_mount+0x25a/0xa20 fs/namespace.c:3012
 path_mount+0x675/0x1020 fs/namespace.c:3342
 init_mount+0xce/0x120 fs/init.c:25
 do_mount_root+0xae/0x300 init/do_mounts.c:376
 mount_block_root+0x192/0x3c0 init/do_mounts.c:415
 mount_root+0x79/0xb0 init/do_mounts.c:593

Memory state around the buggy address:
 ffff88810c22ca00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88810c22ca80: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
>ffff88810c22cb00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                            ^
 ffff88810c22cb80: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
 ffff88810c22cc00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================
================================================================================
UBSAN: array-index-out-of-bounds in kernel/locking/qspinlock.c:130:9
index 16382 is out of range for type 'unsigned long[8]'
CPU: 1 PID: 386 Comm: kworker/1:3 Tainted: G    B             5.15.180-syzkaller-00024-g88c4075c39ed #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/19/2025
Workqueue: wg-crypt-wg0 wg_packet_tx_worker
Call Trace:
 <IRQ>
 __dump_stack+0x21/0x30 lib/dump_stack.c:88
 dump_stack_lvl+0xee/0x150 lib/dump_stack.c:106
 dump_stack+0x15/0x20 lib/dump_stack.c:113
 ubsan_epilogue+0xe/0x40 lib/ubsan.c:151
 __ubsan_handle_out_of_bounds+0xdf/0xf0 lib/ubsan.c:282
 decode_tail kernel/locking/qspinlock.c:130 [inline]
 __pv_queued_spin_lock_slowpath+0x919/0x9c0 kernel/locking/qspinlock.c:468
 pv_queued_spin_lock_slowpath arch/x86/include/asm/paravirt.h:585 [inline]
 queued_spin_lock_slowpath+0x47/0x50 arch/x86/include/asm/qspinlock.h:51
 queued_spin_lock include/asm-generic/qspinlock.h:85 [inline]
 do_raw_spin_lock include/linux/spinlock.h:187 [inline]
 __raw_spin_lock include/linux/spinlock_api_smp.h:143 [inline]
 _raw_spin_lock+0xd8/0xe0 kernel/locking/spinlock.c:154
 spin_lock include/linux/spinlock.h:363 [inline]
 ptr_ring_produce include/linux/ptr_ring.h:128 [inline]
 cpu_map_generic_redirect+0x18a/0x670 kernel/bpf/cpumap.c:786
 xdp_do_generic_redirect_map net/core/filter.c:4189 [inline]
 xdp_do_generic_redirect+0x3be/0xa80 net/core/filter.c:4236
 do_xdp_generic+0x516/0x7a0 net/core/dev.c:4950
 __netif_receive_skb_core+0x12ac/0x2f10 net/core/dev.c:5355
 __netif_receive_skb_one_core net/core/dev.c:5530 [inline]
 __netif_receive_skb+0x72/0x280 net/core/dev.c:5646
 process_backlog+0x368/0x600 net/core/dev.c:6523
 __napi_poll+0xbe/0x590 net/core/dev.c:7082
 napi_poll net/core/dev.c:7149 [inline]
 net_rx_action+0x371/0x8e0 net/core/dev.c:7239
 handle_softirqs+0x250/0x560 kernel/softirq.c:565
 __do_softirq+0xb/0xd kernel/softirq.c:603
 do_softirq+0xc6/0x120 kernel/softirq.c:452
 </IRQ>
 <TASK>
 __local_bh_enable_ip+0x75/0x80 kernel/softirq.c:379
 __raw_read_unlock_bh include/linux/rwlock_api_smp.h:251 [inline]
 _raw_read_unlock_bh+0x29/0x30 kernel/locking/spinlock.c:284
 wg_socket_send_skb_to_peer+0x172/0x1d0 drivers/net/wireguard/socket.c:184
 wg_packet_create_data_done drivers/net/wireguard/send.c:251 [inline]
 wg_packet_tx_worker+0x1bf/0x480 drivers/net/wireguard/send.c:276
 process_one_work+0x6be/0xba0 kernel/workqueue.c:2325
 worker_thread+0xa59/0x1200 kernel/workqueue.c:2472
 kthread+0x411/0x500 kernel/kthread.c:337
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
 </TASK>
================================================================================
general protection fault, probably for non-canonical address 0xe011099f9f7c5076: 0000 [#1] PREEMPT SMP KASAN
KASAN: maybe wild-memory-access in range [0x00886cfcfbe283b0-0x00886cfcfbe283b7]
CPU: 1 PID: 386 Comm: kworker/1:3 Tainted: G    B             5.15.180-syzkaller-00024-g88c4075c39ed #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/19/2025
Workqueue: wg-crypt-wg0 wg_packet_tx_worker
RIP: 0010:__pv_queued_spin_lock_slowpath+0x293/0x9c0 kernel/locking/qspinlock.c:471
Code: c8 48 c1 e8 03 42 80 3c 38 00 74 14 48 89 4c 24 10 48 8b 7c 24 10 e8 2c eb 57 00 48 8b 4c 24 10 4c 03 29 4c 89 e8 48 c1 e8 03 <42> 80 3c 38 00 4d 89 ef 4c 8b 6c 24 30 74 08 4c 89 ff e8 a6 eb 57
RSP: 0018:ffffc900001d06e0 EFLAGS: 00010202
RAX: 00110d9f9f7c5076 RBX: ffff88810c22c904 RCX: ffffffff85e79820
RDX: 0000000000000100 RSI: 0000000000000002 RDI: 00000000ffffffff
RBP: ffffc900001d07d0 R08: 0000000000000004 R09: 0000000000000003
R10: fffffbfff0e1784c R11: 1ffffffff0e1784c R12: 1ffff1103ee27159
R13: 00886cfcfbe283b1 R14: 1ffff11021845920 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f5d4663fbac CR3: 00000001376a2000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 pv_queued_spin_lock_slowpath arch/x86/include/asm/paravirt.h:585 [inline]
 queued_spin_lock_slowpath+0x47/0x50 arch/x86/include/asm/qspinlock.h:51
 queued_spin_lock include/asm-generic/qspinlock.h:85 [inline]
 do_raw_spin_lock include/linux/spinlock.h:187 [inline]
 __raw_spin_lock include/linux/spinlock_api_smp.h:143 [inline]
 _raw_spin_lock+0xd8/0xe0 kernel/locking/spinlock.c:154
 spin_lock include/linux/spinlock.h:363 [inline]
 ptr_ring_produce include/linux/ptr_ring.h:128 [inline]
 cpu_map_generic_redirect+0x18a/0x670 kernel/bpf/cpumap.c:786
 xdp_do_generic_redirect_map net/core/filter.c:4189 [inline]
 xdp_do_generic_redirect+0x3be/0xa80 net/core/filter.c:4236
 do_xdp_generic+0x516/0x7a0 net/core/dev.c:4950
 __netif_receive_skb_core+0x12ac/0x2f10 net/core/dev.c:5355
 __netif_receive_skb_one_core net/core/dev.c:5530 [inline]
 __netif_receive_skb+0x72/0x280 net/core/dev.c:5646
 process_backlog+0x368/0x600 net/core/dev.c:6523
 __napi_poll+0xbe/0x590 net/core/dev.c:7082
 napi_poll net/core/dev.c:7149 [inline]
 net_rx_action+0x371/0x8e0 net/core/dev.c:7239
 handle_softirqs+0x250/0x560 kernel/softirq.c:565
 __do_softirq+0xb/0xd kernel/softirq.c:603
 do_softirq+0xc6/0x120 kernel/softirq.c:452
 </IRQ>
 <TASK>
 __local_bh_enable_ip+0x75/0x80 kernel/softirq.c:379
 __raw_read_unlock_bh include/linux/rwlock_api_smp.h:251 [inline]
 _raw_read_unlock_bh+0x29/0x30 kernel/locking/spinlock.c:284
 wg_socket_send_skb_to_peer+0x172/0x1d0 drivers/net/wireguard/socket.c:184
 wg_packet_create_data_done drivers/net/wireguard/send.c:251 [inline]
 wg_packet_tx_worker+0x1bf/0x480 drivers/net/wireguard/send.c:276
 process_one_work+0x6be/0xba0 kernel/workqueue.c:2325
 worker_thread+0xa59/0x1200 kernel/workqueue.c:2472
 kthread+0x411/0x500 kernel/kthread.c:337
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
 </TASK>
Modules linked in:
---[ end trace 2a7356cbe77b1e55 ]---
RIP: 0010:__pv_queued_spin_lock_slowpath+0x293/0x9c0 kernel/locking/qspinlock.c:471
Code: c8 48 c1 e8 03 42 80 3c 38 00 74 14 48 89 4c 24 10 48 8b 7c 24 10 e8 2c eb 57 00 48 8b 4c 24 10 4c 03 29 4c 89 e8 48 c1 e8 03 <42> 80 3c 38 00 4d 89 ef 4c 8b 6c 24 30 74 08 4c 89 ff e8 a6 eb 57
RSP: 0018:ffffc900001d06e0 EFLAGS: 00010202
RAX: 00110d9f9f7c5076 RBX: ffff88810c22c904 RCX: ffffffff85e79820
RDX: 0000000000000100 RSI: 0000000000000002 RDI: 00000000ffffffff
RBP: ffffc900001d07d0 R08: 0000000000000004 R09: 0000000000000003
R10: fffffbfff0e1784c R11: 1ffffffff0e1784c R12: 1ffff1103ee27159
R13: 00886cfcfbe283b1 R14: 1ffff11021845920 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f5d4663fbac CR3: 00000001376a2000 CR4: 00000000003526a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	c8 48 c1 e8          	enter  $0xc148,$0xe8
   4:	03 42 80             	add    -0x80(%rdx),%eax
   7:	3c 38                	cmp    $0x38,%al
   9:	00 74 14 48          	add    %dh,0x48(%rsp,%rdx,1)
   d:	89 4c 24 10          	mov    %ecx,0x10(%rsp)
  11:	48 8b 7c 24 10       	mov    0x10(%rsp),%rdi
  16:	e8 2c eb 57 00       	call   0x57eb47
  1b:	48 8b 4c 24 10       	mov    0x10(%rsp),%rcx
  20:	4c 03 29             	add    (%rcx),%r13
  23:	4c 89 e8             	mov    %r13,%rax
  26:	48 c1 e8 03          	shr    $0x3,%rax
* 2a:	42 80 3c 38 00       	cmpb   $0x0,(%rax,%r15,1) <-- trapping instruction
  2f:	4d 89 ef             	mov    %r13,%r15
  32:	4c 8b 6c 24 30       	mov    0x30(%rsp),%r13
  37:	74 08                	je     0x41
  39:	4c 89 ff             	mov    %r15,%rdi
  3c:	e8                   	.byte 0xe8
  3d:	a6                   	cmpsb  %es:(%rdi),%ds:(%rsi)
  3e:	eb 57                	jmp    0x97