=====================================================
BUG: KMSAN: uninit-value in netif_receive_generic_xdp+0x158b/0x2540 net/core/dev.c:4687
CPU: 1 PID: 2635 Comm: syz-executor.5 Not tainted 5.11.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:79 [inline]
 dump_stack+0x21c/0x280 lib/dump_stack.c:120
 kmsan_report+0xfb/0x1e0 mm/kmsan/kmsan_report.c:118
 __msan_warning+0x5f/0xa0 mm/kmsan/kmsan_instr.c:197
 netif_receive_generic_xdp+0x158b/0x2540 net/core/dev.c:4687
 do_xdp_generic net/core/dev.c:4752 [inline]
 __netif_receive_skb_core+0x298b/0x6640 net/core/dev.c:5144
 __netif_receive_skb_one_core net/core/dev.c:5321 [inline]
 __netif_receive_skb+0xf2/0x640 net/core/dev.c:5437
 process_backlog+0x517/0xbd0 net/core/dev.c:6328
 napi_poll+0x428/0x15c0 net/core/dev.c:6806
 net_rx_action+0x34c/0xd30 net/core/dev.c:6889
 __do_softirq+0x1b9/0x715 kernel/softirq.c:343
 asm_call_irq_on_stack+0xf/0x20
 </IRQ>
 __run_on_irqstack arch/x86/include/asm/irq_stack.h:26 [inline]
 run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:77 [inline]
 do_softirq_own_stack+0x6e/0x90 arch/x86/kernel/irq_64.c:77
 do_softirq+0xed/0x150 kernel/softirq.c:246
 netif_rx_ni+0x90/0x2c0 net/core/dev.c:4847
 can_send+0xde8/0x1010 net/can/af_can.c:287
 isotp_sendmsg+0x1d49/0x2460 net/can/isotp.c:947
 sock_sendmsg_nosec net/socket.c:652 [inline]
 sock_sendmsg net/socket.c:672 [inline]
 ____sys_sendmsg+0xcfc/0x12f0 net/socket.c:2345
 ___sys_sendmsg net/socket.c:2399 [inline]
 __sys_sendmmsg+0x84e/0x1010 net/socket.c:2482
 __compat_sys_sendmmsg net/compat.c:361 [inline]
 __do_compat_sys_sendmmsg net/compat.c:368 [inline]
 __se_compat_sys_sendmmsg+0xcd/0xf0 net/compat.c:365
 __ia32_compat_sys_sendmmsg+0x56/0x70 net/compat.c:365
 do_syscall_32_irqs_on arch/x86/entry/common.c:79 [inline]
 __do_fast_syscall_32+0x102/0x160 arch/x86/entry/common.c:141
 do_fast_syscall_32+0x6a/0xc0 arch/x86/entry/common.c:166
 do_SYSENTER_32+0x73/0x90 arch/x86/entry/common.c:209
 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c
RIP: 0023:0xf7ff6549
Code: 03 74 c0 01 10 05 03 74 b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00
RSP: 002b:00000000f55ae5fc EFLAGS: 00000296 ORIG_RAX: 0000000000000159
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000020005240
RDX: 0000000000000002 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000

Uninit was stored to memory at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:121 [inline]
 kmsan_internal_chain_origin+0xad/0x130 mm/kmsan/kmsan.c:289
 kmsan_memcpy_memmove_metadata+0x25e/0x2d0 mm/kmsan/kmsan.c:226
 kmsan_memcpy_metadata+0xb/0x10 mm/kmsan/kmsan.c:246
 __msan_memcpy+0x46/0x60 mm/kmsan/kmsan_instr.c:110
 pskb_expand_head+0x3d6/0x1e20 net/core/skbuff.c:1647
 netif_receive_generic_xdp+0x64b/0x2540 net/core/dev.c:4633
 do_xdp_generic net/core/dev.c:4752 [inline]
 __netif_receive_skb_core+0x298b/0x6640 net/core/dev.c:5144
 __netif_receive_skb_one_core net/core/dev.c:5321 [inline]
 __netif_receive_skb+0xf2/0x640 net/core/dev.c:5437
 process_backlog+0x517/0xbd0 net/core/dev.c:6328
 napi_poll+0x428/0x15c0 net/core/dev.c:6806
 net_rx_action+0x34c/0xd30 net/core/dev.c:6889
 __do_softirq+0x1b9/0x715 kernel/softirq.c:343

Uninit was created at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:121 [inline]
 kmsan_internal_poison_shadow+0x5c/0xf0 mm/kmsan/kmsan.c:104
 kmsan_slab_alloc+0x8d/0xe0 mm/kmsan/kmsan_hooks.c:76
 slab_alloc_node mm/slub.c:2907 [inline]
 __kmalloc_node_track_caller+0xa37/0x1430 mm/slub.c:4527
 __kmalloc_reserve net/core/skbuff.c:142 [inline]
 __alloc_skb+0x2f8/0xb30 net/core/skbuff.c:210
 alloc_skb include/linux/skbuff.h:1099 [inline]
 alloc_skb_with_frags+0x1f3/0xc10 net/core/skbuff.c:5894
 sock_alloc_send_pskb+0xdc1/0xf90 net/core/sock.c:2348
 sock_alloc_send_skb+0xca/0xe0 net/core/sock.c:2365
 isotp_sendmsg+0xa9d/0x2460 net/can/isotp.c:884
 sock_sendmsg_nosec net/socket.c:652 [inline]
 sock_sendmsg net/socket.c:672 [inline]
 ____sys_sendmsg+0xcfc/0x12f0 net/socket.c:2345
 ___sys_sendmsg net/socket.c:2399 [inline]
 __sys_sendmmsg+0x84e/0x1010 net/socket.c:2482
 __compat_sys_sendmmsg net/compat.c:361 [inline]
 __do_compat_sys_sendmmsg net/compat.c:368 [inline]
 __se_compat_sys_sendmmsg+0xcd/0xf0 net/compat.c:365
 __ia32_compat_sys_sendmmsg+0x56/0x70 net/compat.c:365
 do_syscall_32_irqs_on arch/x86/entry/common.c:79 [inline]
 __do_fast_syscall_32+0x102/0x160 arch/x86/entry/common.c:141
 do_fast_syscall_32+0x6a/0xc0 arch/x86/entry/common.c:166
 do_SYSENTER_32+0x73/0x90 arch/x86/entry/common.c:209
 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c
=====================================================