===================================================== BUG: KMSAN: uninit-value in netif_receive_generic_xdp+0x158b/0x2540 net/core/dev.c:4680 CPU: 0 PID: 24399 Comm: syz-executor.2 Not tainted 5.10.0-rc4-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x21c/0x280 lib/dump_stack.c:118 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:4680 do_xdp_generic net/core/dev.c:4745 [inline] __netif_receive_skb_core+0x298b/0x6600 net/core/dev.c:5136 __netif_receive_skb_one_core net/core/dev.c:5313 [inline] __netif_receive_skb+0xf2/0x640 net/core/dev.c:5429 process_backlog+0x517/0xbd0 net/core/dev.c:6319 napi_poll+0x40a/0x1020 net/core/dev.c:6763 net_rx_action+0x34c/0xd30 net/core/dev.c:6833 __do_softirq+0x1a9/0x6fa kernel/softirq.c:298 asm_call_irq_on_stack+0xf/0x20 __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 kernel/softirq.c:343 [inline] __local_bh_enable_ip+0x184/0x1d0 kernel/softirq.c:195 local_bh_enable+0x36/0x40 include/linux/bottom_half.h:32 rcu_read_unlock_bh include/linux/rcupdate.h:730 [inline] __dev_queue_xmit+0x3b3e/0x4590 net/core/dev.c:4167 dev_queue_xmit+0x4b/0x60 net/core/dev.c:4173 can_send+0xc6c/0x1010 net/can/af_can.c:277 isotp_sendmsg+0x1c87/0x2330 net/can/isotp.c:942 sock_sendmsg_nosec net/socket.c:651 [inline] sock_sendmsg net/socket.c:671 [inline] ____sys_sendmsg+0xcfc/0x12f0 net/socket.c:2353 ___sys_sendmsg net/socket.c:2407 [inline] __sys_sendmmsg+0x882/0x1070 net/socket.c:2490 __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:80 [inline] __do_fast_syscall_32+0x102/0x160 arch/x86/entry/common.c:139 do_fast_syscall_32+0x6a/0xc0 arch/x86/entry/common.c:162 do_SYSENTER_32+0x73/0x90 arch/x86/entry/common.c:205 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c RIP: 0023:0xf7f3b549 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:00000000f55355fc EFLAGS: 00000296 ORIG_RAX: 0000000000000159 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000020004900 RDX: 0000000000000001 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:1631 netif_receive_generic_xdp+0x64b/0x2540 net/core/dev.c:4626 do_xdp_generic net/core/dev.c:4745 [inline] __netif_receive_skb_core+0x298b/0x6600 net/core/dev.c:5136 __netif_receive_skb_one_core net/core/dev.c:5313 [inline] __netif_receive_skb+0xf2/0x640 net/core/dev.c:5429 process_backlog+0x517/0xbd0 net/core/dev.c:6319 napi_poll+0x40a/0x1020 net/core/dev.c:6763 net_rx_action+0x34c/0xd30 net/core/dev.c:6833 __do_softirq+0x1a9/0x6fa kernel/softirq.c:298 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:2906 [inline] __kmalloc_node_track_caller+0xa48/0x1610 mm/slub.c:4512 __kmalloc_reserve net/core/skbuff.c:142 [inline] __alloc_skb+0x318/0xb00 net/core/skbuff.c:210 alloc_skb include/linux/skbuff.h:1094 [inline] alloc_skb_with_frags+0x1f3/0xc10 net/core/skbuff.c:5832 sock_alloc_send_pskb+0xcc4/0xe80 net/core/sock.c:2329 sock_alloc_send_skb+0xca/0xe0 net/core/sock.c:2346 isotp_sendmsg+0x8ff/0x2330 net/can/isotp.c:876 sock_sendmsg_nosec net/socket.c:651 [inline] sock_sendmsg net/socket.c:671 [inline] ____sys_sendmsg+0xcfc/0x12f0 net/socket.c:2353 ___sys_sendmsg net/socket.c:2407 [inline] __sys_sendmmsg+0x882/0x1070 net/socket.c:2490 __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:80 [inline] __do_fast_syscall_32+0x102/0x160 arch/x86/entry/common.c:139 do_fast_syscall_32+0x6a/0xc0 arch/x86/entry/common.c:162 do_SYSENTER_32+0x73/0x90 arch/x86/entry/common.c:205 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c =====================================================