===================================================== BUG: KMSAN: uninit-value in update_stack_state+0x1ee/0xb40 arch/x86/kernel/unwind_frame.c:202 CPU: 0 PID: 10241 Comm: syz-executor.1 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_carve_inside_nonlinear net/core/skbuff.c:5956 [inline] pskb_carve+0x801/0x2b20 net/core/skbuff.c:6024 pskb_extract+0x102/0x420 net/core/skbuff.c:6038 rds_tcp_data_recv+0x8ba/0x1670 net/rds/tcp_recv.c:218 tcp_read_sock+0x838/0x2350 net/ipv4/tcp.c:1646 rds_tcp_read_sock net/rds/tcp_recv.c:276 [inline] rds_tcp_data_ready+0x2b3/0x680 net/rds/tcp_recv.c:325 tcp_data_ready net/ipv4/tcp_input.c:4795 [inline] tcp_rcv_established+0x2dca/0x3280 net/ipv4/tcp_input.c:5724 tcp_v6_do_rcv+0x89c/0x1d00 net/ipv6/tcp_ipv6.c:1449 tcp_v6_rcv+0x444c/0x4cb0 net/ipv6/tcp_ipv6.c:1682 ip6_protocol_deliver_rcu+0x13c3/0x22c0 net/ipv6/ip6_input.c:433 ip6_input_finish net/ipv6/ip6_input.c:474 [inline] NF_HOOK include/linux/netfilter.h:307 [inline] ip6_input+0x2af/0x340 net/ipv6/ip6_input.c:483 dst_input include/net/dst.h:449 [inline] ip6_rcv_finish net/ipv6/ip6_input.c:76 [inline] NF_HOOK include/linux/netfilter.h:307 [inline] ipv6_rcv+0x683/0x710 net/ipv6/ip6_input.c:307 __netif_receive_skb_one_core net/core/dev.c:5281 [inline] __netif_receive_skb net/core/dev.c:5395 [inline] process_backlog+0x72c/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 e5 f1 71 ff ce 75 1a e8 bb 70 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 6a 9b 31 c0 RSP: 0018:ffffab994380ad98 EFLAGS: 00000282 RAX: ffffbb994380ade0 RBX: ffffab994380ade0 RCX: 0000000000000003 RDX: 0000000000000002 RSI: 0000000000000000 RDI: ffffab994380ade0 RBP: ffffab994380adc0 R08: 0000000000000002 R09: ffffb3994380ade0 R10: 0000000000000004 R11: 0000000000000000 R12: ffff9456fa032858 R13: 0000000000000200 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 kernel/softirq.c:333 [inline] __local_bh_enable_ip+0xf7/0x1d0 kernel/softirq.c:190 local_bh_enable+0x36/0x40 include/linux/bottom_half.h:32 rcu_read_unlock_bh include/linux/rcupdate.h:723 [inline] ip6_finish_output2+0x2111/0x2620 net/ipv6/ip6_output.c:118 __ip6_finish_output+0x824/0x8e0 net/ipv6/ip6_output.c:143 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] NF_HOOK include/linux/netfilter.h:307 [inline] ip6_xmit+0x1f67/0x2710 net/ipv6/ip6_output.c:280 inet6_csk_xmit+0x42b/0x570 net/ipv6/inet6_connection_sock.c:135 __tcp_transmit_skb+0x440e/0x6090 net/ipv4/tcp_output.c:1240 tcp_transmit_skb net/ipv4/tcp_output.c:1256 [inline] tcp_write_xmit+0x30b1/0xb430 net/ipv4/tcp_output.c:2519 tcp_push_one+0x187/0x210 net/ipv4/tcp_output.c:2708 tcp_sendmsg_locked+0x47f4/0x6d00 net/ipv4/tcp.c:1391 tcp_sendmsg+0xb2/0x100 net/ipv4/tcp.c:1441 inet6_sendmsg+0x178/0x2e0 net/ipv6/af_inet6.c:638 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg net/socket.c:672 [inline] __sys_sendto+0x90c/0xc90 net/socket.c:1995 __do_sys_sendto net/socket.c:2007 [inline] __se_sys_sendto+0x107/0x130 net/socket.c:2003 __x64_sys_sendto+0x6e/0x90 net/socket.c:2003 do_syscall_64+0xb0/0x150 arch/x86/entry/common.c:386 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45c1f9 Code: Bad RIP value. RSP: 002b:00007f043ef8ec78 EFLAGS: 00000246 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 000000000002b8c0 RCX: 000000000045c1f9 RDX: 00000000fffffdef RSI: 0000000020000200 RDI: 0000000000000005 RBP: 000000000078bf58 R08: 0000000000000000 R09: 00000000000001f4 R10: 0000000000040080 R11: 0000000000000246 R12: 000000000078bf0c R13: 0000000000c9fb6f R14: 00007f043ef8f9c0 R15: 000000000078bf0c Local variable ----acpar@ip6t_do_table created at: ip6t_do_table+0xc3/0x2ac0 net/ipv6/netfilter/ip6_tables.c:263 ip6t_do_table+0xc3/0x2ac0 net/ipv6/netfilter/ip6_tables.c:263 =====================================================