=====================================================
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+0x474/0xac0 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 kernel/softirq.c:656 [inline]
 invoke_softirq kernel/softirq.c:496 [inline]
 __irq_exit_rcu+0x66/0x180 kernel/softirq.c:723
 irq_exit_rcu+0x12/0x20 kernel/softirq.c:739
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1052 [inline]
 sysvec_apic_timer_interrupt+0x84/0x90 arch/x86/kernel/apic/apic.c:1052
 asm_sysvec_apic_timer_interrupt+0x1f/0x30 arch/x86/include/asm/idtentry.h:702
 __preempt_count_dec_and_test arch/x86/include/asm/preempt.h:95 [inline]
 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
 _raw_spin_unlock_irqrestore+0x33/0x60 kernel/locking/spinlock.c:194
 unlock_hrtimer_base kernel/time/hrtimer.c:1013 [inline]
 hrtimer_start_range_ns+0x16e3/0x1910 kernel/time/hrtimer.c:1325
 hrtimer_start include/linux/hrtimer.h:259 [inline]
 j1939_tp_schedule_txtimer+0xc7/0x110 net/can/j1939/transport.c:703
 j1939_sk_send_loop net/can/j1939/socket.c:1169 [inline]
 j1939_sk_sendmsg+0x1bb4/0x2760 net/can/j1939/socket.c:1282
 sock_sendmsg_nosec net/socket.c:727 [inline]
 __sock_sendmsg+0x330/0x3d0 net/socket.c:742
 ____sys_sendmsg+0x893/0xd80 net/socket.c:2630
 ___sys_sendmsg+0x271/0x3b0 net/socket.c:2684
 __sys_sendmmsg+0x2d9/0x7c0 net/socket.c:2773
 __do_sys_sendmmsg net/socket.c:2800 [inline]
 __se_sys_sendmmsg net/socket.c:2797 [inline]
 __x64_sys_sendmmsg+0xc6/0x150 net/socket.c:2797
 x64_sys_call+0x21de/0x3e30 arch/x86/include/generated/asm/syscalls_64.h:308
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xd9/0x210 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Uninit was created at:
 __alloc_frozen_pages_noprof+0x689/0xf00 mm/page_alloc.c:5206
 alloc_buddy_hugetlb_folio mm/hugetlb.c:1944 [inline]
 only_alloc_fresh_hugetlb_folio+0x2b0/0x1280 mm/hugetlb.c:1984
 alloc_fresh_hugetlb_folio mm/hugetlb.c:2003 [inline]
 alloc_surplus_hugetlb_folio+0x178/0x5c0 mm/hugetlb.c:2223
 gather_surplus_pages mm/hugetlb.c:2415 [inline]
 hugetlb_acct_memory+0x759/0x2420 mm/hugetlb.c:5331
 hugetlb_reserve_pages+0x10d1/0x26f0 mm/hugetlb.c:7345
 hugetlbfs_file_mmap+0x73b/0x9e0 fs/hugetlbfs/inode.c:153
 vfs_mmap include/linux/fs.h:2399 [inline]
 mmap_file mm/internal.h:167 [inline]
 __mmap_new_file_vma mm/vma.c:2413 [inline]
 __mmap_new_vma mm/vma.c:2476 [inline]
 __mmap_region mm/vma.c:2670 [inline]
 mmap_region+0x362f/0x5020 mm/vma.c:2740
 do_mmap+0x17a8/0x1d70 mm/mmap.c:558
 vm_mmap_pgoff+0x40d/0x770 mm/util.c:580
 ksys_mmap_pgoff+0x702/0x7c0 mm/mmap.c:604
 __do_sys_mmap arch/x86/kernel/sys_x86_64.c:89 [inline]
 __se_sys_mmap arch/x86/kernel/sys_x86_64.c:82 [inline]
 __x64_sys_mmap+0x19c/0x260 arch/x86/kernel/sys_x86_64.c:82
 x64_sys_call+0x18a7/0x3e30 arch/x86/include/generated/asm/syscalls_64.h:10
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xd9/0x210 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

CPU: 1 UID: 0 PID: 16367 Comm: syz.8.2923 Tainted: G        W           syzkaller #0 PREEMPT(none) 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
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