=====================================================
BUG: KMSAN: uninit-value in can_receive+0x12c/0x4a0 net/can/af_can.c:656
 can_receive+0x12c/0x4a0 net/can/af_can.c:656
 can_rcv+0x1ff/0x3b0 net/can/af_can.c:690
 __netif_receive_skb_one_core net/core/dev.c:6079 [inline]
 __netif_receive_skb+0x477/0xac0 net/core/dev.c:6192
 process_backlog+0x485/0xa00 net/core/dev.c:6544
 __napi_poll+0xdd/0x8a0 net/core/dev.c:7594
 napi_poll net/core/dev.c:7657 [inline]
 net_rx_action+0xbc8/0x1c30 net/core/dev.c:7784
 handle_softirqs+0x169/0x6e0 kernel/softirq.c:622
 __do_softirq+0x14/0x1b kernel/softirq.c:656
 do_softirq+0x99/0x100 kernel/softirq.c:523
 __local_bh_enable_ip+0xa1/0xb0 kernel/softirq.c:450
 __raw_spin_unlock_bh include/linux/spinlock_api_smp.h:167 [inline]
 _raw_spin_unlock_bh+0x2d/0x40 kernel/locking/spinlock.c:210
 spin_unlock_bh include/linux/spinlock.h:396 [inline]
 release_sock+0x21d/0x270 net/core/sock.c:3744
 j1939_sk_sendmsg+0xeb/0x2760 net/can/j1939/socket.c:1285
 sock_sendmsg_nosec net/socket.c:727 [inline]
 __sock_sendmsg+0x333/0x3d0 net/socket.c:742
 ____sys_sendmsg+0x7e0/0xd80 net/socket.c:2630
 ___sys_sendmsg+0x271/0x3b0 net/socket.c:2684
 __sys_sendmsg+0x1aa/0x300 net/socket.c:2716
 __compat_sys_sendmsg net/compat.c:346 [inline]
 __do_compat_sys_sendmsg net/compat.c:353 [inline]
 __se_compat_sys_sendmsg net/compat.c:350 [inline]
 __ia32_compat_sys_sendmsg+0xa4/0x100 net/compat.c:350
 ia32_sys_call+0x3f6c/0x4310 arch/x86/include/generated/asm/syscalls_32.h:371
 do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline]
 __do_fast_syscall_32+0xb0/0x150 arch/x86/entry/syscall_32.c:306
 do_fast_syscall_32+0x38/0x80 arch/x86/entry/syscall_32.c:331
 do_SYSENTER_32+0x1f/0x30 arch/x86/entry/syscall_32.c:369
 entry_SYSENTER_compat_after_hwframe+0x84/0x8e

Uninit was created at:
 __alloc_frozen_pages_noprof+0x689/0xf00 mm/page_alloc.c:5206
 __alloc_pages_noprof mm/page_alloc.c:5217 [inline]
 alloc_pages_bulk_noprof+0x157b/0x19c0 mm/page_alloc.c:5137
 alloc_pages_bulk_node_noprof include/linux/gfp.h:254 [inline]
 __page_pool_alloc_netmems_slow+0x2e5/0xb40 net/core/page_pool.c:612
 page_pool_alloc_netmems net/core/page_pool.c:663 [inline]
 page_pool_alloc_frag_netmem+0x62a/0xcf0 net/core/page_pool.c:1072
 page_pool_alloc_netmem include/net/page_pool/helpers.h:131 [inline]
 page_pool_alloc include/net/page_pool/helpers.h:167 [inline]
 page_pool_alloc_va include/net/page_pool/helpers.h:198 [inline]
 page_pool_dev_alloc_va include/net/page_pool/helpers.h:221 [inline]
 skb_pp_cow_data+0x3e3/0x2640 net/core/skbuff.c:919
 skb_cow_data_for_xdp+0x79/0xd0 net/core/skbuff.c:986
 netif_skb_check_for_xdp net/core/dev.c:5429 [inline]
 netif_receive_generic_xdp net/core/dev.c:5470 [inline]
 do_xdp_generic+0x7f5/0x1690 net/core/dev.c:5538
 __netif_receive_skb_core+0x2bc2/0x7150 net/core/dev.c:5889
 __netif_receive_skb_one_core net/core/dev.c:6077 [inline]
 __netif_receive_skb+0xcc/0xac0 net/core/dev.c:6192
 process_backlog+0x485/0xa00 net/core/dev.c:6544
 __napi_poll+0xdd/0x8a0 net/core/dev.c:7594
 napi_poll net/core/dev.c:7657 [inline]
 net_rx_action+0xbc8/0x1c30 net/core/dev.c:7784
 handle_softirqs+0x169/0x6e0 kernel/softirq.c:622
 run_ksoftirqd+0x29/0x50 kernel/softirq.c:1063
 smpboot_thread_fn+0x56c/0xa30 kernel/smpboot.c:160
 kthread+0xd5c/0xf00 kernel/kthread.c:463
 ret_from_fork+0x1f5/0x4c0 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

CPU: 0 UID: 0 PID: 17999 Comm: syz.8.3997 Tainted: G        W           syzkaller #0 PREEMPT(none) 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
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