===================================================== BUG: KMSAN: uninit-value in update_stack_state+0x1ee/0xb40 arch/x86/kernel/unwind_frame.c:202 CPU: 1 PID: 14675 Comm: syz-executor.2 Not tainted 5.8.0-rc5-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+0x1df/0x240 lib/dump_stack.c:118 kmsan_report+0xf7/0x1e0 mm/kmsan/kmsan_report.c:121 __msan_warning+0x58/0xa0 mm/kmsan/kmsan_instr.c:215 update_stack_state+0x1ee/0xb40 arch/x86/kernel/unwind_frame.c:202 unwind_next_frame+0x8c6/0xed0 arch/x86/kernel/unwind_frame.c:305 arch_stack_walk+0x33e/0x3e0 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0x117/0x1a0 kernel/stacktrace.c:123 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:144 [inline] kmsan_internal_chain_origin+0xad/0x130 mm/kmsan/kmsan.c:310 kmsan_memcpy_memmove_metadata+0x272/0x2e0 mm/kmsan/kmsan.c:247 kmsan_memcpy_metadata+0xb/0x10 mm/kmsan/kmsan.c:267 __msan_memcpy+0x43/0x50 mm/kmsan/kmsan_instr.c:116 pskb_expand_head+0x38b/0x1b00 net/core/skbuff.c:1636 skb_unclone include/linux/skbuff.h:1622 [inline] skb_copy_ubufs+0x2a0/0x2190 net/core/skbuff.c:1348 skb_orphan_frags_rx include/linux/skbuff.h:2764 [inline] __netif_receive_skb_core+0x548b/0x5890 net/core/dev.c:5246 __netif_receive_skb_one_core net/core/dev.c:5279 [inline] __netif_receive_skb net/core/dev.c:5395 [inline] process_backlog+0x605/0x14e0 net/core/dev.c:6239 napi_poll net/core/dev.c:6684 [inline] net_rx_action+0x746/0x1aa0 net/core/dev.c:6752 __do_softirq+0x311/0x83d kernel/softirq.c:293 asm_call_on_stack+0x12/0x20 arch/x86/entry/entry_64.S:711 __run_on_irqstack arch/x86/include/asm/irq_stack.h:23 [inline] run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:50 [inline] do_softirq_own_stack+0x7c/0xa0 arch/x86/kernel/irq_64.c:77 invoke_softirq kernel/softirq.c:390 [inline] __irq_exit_rcu+0x226/0x270 kernel/softirq.c:420 irq_exit_rcu+0xe/0x10 kernel/softirq.c:432 sysvec_call_function_single+0x107/0x130 arch/x86/kernel/smp.c:243 asm_sysvec_call_function_single+0x12/0x20 arch/x86/include/asm/idtentry.h:601 RIP: 0010:__msan_instrument_asm_store+0xfd/0x120 mm/kmsan/kmsan_instr.c:78 Code: 89 df 4c 89 f6 31 d2 e8 91 f3 ff ff be ff ff ff ff 65 0f c1 35 44 e7 91 5d ff ce 75 1a e8 bb 72 2e ff 4c 89 7d e0 ff 75 e0 9d <48> 83 c4 10 5b 41 5e 41 5f 5d c3 0f 0b 48 c7 c7 ea 03 ca af 31 c0 RSP: 0018:ffffaded03522d88 EFLAGS: 00000282 RAX: ffffbded03522dd0 RBX: ffffaded03522dd0 RCX: 0000000000000003 RDX: 0000000000000002 RSI: 0000000000000000 RDI: ffffaded03522dd0 RBP: ffffaded03522db0 R08: 0000000000000002 R09: ffffb5ed03522dd0 R10: 0000000000000004 R11: 0000000000000000 R12: ffff8e05fe59a858 R13: ffff8e0650078b00 R14: 0000000000000008 R15: 0000000000000282 native_save_fl arch/x86/include/asm/irqflags.h:29 [inline] arch_local_save_flags arch/x86/include/asm/irqflags.h:79 [inline] arch_local_irq_save arch/x86/include/asm/irqflags.h:120 [inline] do_softirq+0x5d/0x150 kernel/softirq.c:333 netif_rx_ni+0x202/0x3b0 net/core/dev.c:4830 dev_loopback_xmit+0x58a/0x630 net/core/dev.c:3846 NF_HOOK include/linux/netfilter.h:307 [inline] ip6_finish_output2+0x2339/0x2620 net/ipv6/ip6_output.c:81 ip6_fragment+0x24a9/0x3950 net/ipv6/ip6_output.c:861 __ip6_finish_output+0x73a/0x8e0 net/ipv6/ip6_output.c:141 ip6_finish_output+0x166/0x410 net/ipv6/ip6_output.c:153 NF_HOOK_COND include/linux/netfilter.h:296 [inline] ip6_output+0x60a/0x770 net/ipv6/ip6_output.c:176 dst_output include/net/dst.h:443 [inline] ip6_local_out+0x164/0x1d0 net/ipv6/output_core.c:179 ip6_send_skb+0xfa/0x390 net/ipv6/ip6_output.c:1865 udp_v6_send_skb+0x1834/0x1e80 net/ipv6/udp.c:1175 udpv6_sendmsg+0x4570/0x4940 net/ipv6/udp.c:1473 inet6_sendmsg+0x276/0x2e0 net/ipv6/af_inet6.c:638 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg net/socket.c:672 [inline] ____sys_sendmsg+0xca5/0x1400 net/socket.c:2352 ___sys_sendmsg net/socket.c:2406 [inline] __sys_sendmmsg+0x60e/0xd80 net/socket.c:2496 __do_sys_sendmmsg net/socket.c:2525 [inline] __se_sys_sendmmsg+0xbd/0xe0 net/socket.c:2522 __x64_sys_sendmmsg+0x56/0x70 net/socket.c:2522 do_syscall_64+0xb0/0x150 arch/x86/entry/common.c:386 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45c1d9 Code: Bad RIP value. RSP: 002b:00007f1d8ff53c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 RAX: ffffffffffffffda RBX: 0000000000025a40 RCX: 000000000045c1d9 RDX: 0400000000000132 RSI: 0000000020004d80 RDI: 0000000000000003 RBP: 000000000078bf48 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000004000000 R11: 0000000000000246 R12: 000000000078bf0c R13: 0000000000c9fb6f R14: 00007f1d8ff549c0 R15: 000000000078bf0c Local variable ----item@nf_ct_deliver_cached_events created at: nf_ct_deliver_cached_events+0x7e/0x6c0 net/netfilter/nf_conntrack_ecache.c:197 nf_ct_deliver_cached_events+0x7e/0x6c0 net/netfilter/nf_conntrack_ecache.c:197 =====================================================