===================================================== BUG: KMSAN: uninit-value in update_stack_state+0x1ee/0xb40 arch/x86/kernel/unwind_frame.c:202 CPU: 1 PID: 12338 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: <IRQ> __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x21c/0x280 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+0x338/0x3d0 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+0x3fd/0x1e30 net/core/skbuff.c:1636 skb_unclone include/linux/skbuff.h:1622 [inline] skb_copy_ubufs+0x2123/0x29a0 net/core/skbuff.c:1348 skb_orphan_frags_rx include/linux/skbuff.h:2764 [inline] __netif_receive_skb_core+0x6301/0x6520 net/core/dev.c:5246 __netif_receive_skb_one_core net/core/dev.c:5279 [inline] __netif_receive_skb+0x164/0x670 net/core/dev.c:5395 process_backlog+0x50d/0xba0 net/core/dev.c:6239 napi_poll+0x43b/0xfd0 net/core/dev.c:6684 net_rx_action+0x35c/0xd40 net/core/dev.c:6752 __do_softirq+0x2ea/0x7f5 kernel/softirq.c:293 asm_call_on_stack+0xf/0x20 arch/x86/entry/entry_64.S:711 </IRQ> __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:native_save_fl kernel/softirq.c:330 [inline] RIP: 0010:arch_local_save_flags arch/x86/include/asm/irqflags.h:79 [inline] RIP: 0010:arch_local_irq_save arch/x86/include/asm/irqflags.h:120 [inline] RIP: 0010:do_softirq+0x3c/0x150 kernel/softirq.c:333 Code: 48 8b 04 25 28 00 00 00 48 89 45 d0 e8 fd 97 cd 00 49 89 c4 65 8b 05 1f 2c 98 7e a9 00 ff ff 00 0f 85 c2 00 00 00 48 8d 5d c8 <be> 08 00 00 00 48 89 df 48 c7 c2 80 5e 29 92 e8 70 95 cd 00 be 08 RSP: 0018:ffff8880b4c97078 EFLAGS: 00000246 RAX: 0000000080000000 RBX: ffff8880b4c97088 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 000000000000037d RDI: 000000000000037e RBP: ffff8880b4c970c0 R08: ffffffff8ddf199c R09: ffff88812fffa000 R10: 0000000000000000 R11: 0000000000000000 R12: ffff88812485a858 R13: ffff888114373900 R14: ffff88812485a860 R15: ffff88812485a858 netif_rx_ni+0x21b/0x3c0 net/core/dev.c:4830 dev_loopback_xmit+0x64c/0x730 net/core/dev.c:3846 NF_HOOK include/linux/netfilter.h:307 [inline] ip6_finish_output2+0x274a/0x2a70 net/ipv6/ip6_output.c:81 __ip6_finish_output+0x9c0/0xa90 net/ipv6/ip6_output.c:143 ip6_finish_output+0x14b/0x4b0 net/ipv6/ip6_output.c:153 NF_HOOK_COND include/linux/netfilter.h:296 [inline] ip6_output+0x68d/0x7f0 net/ipv6/ip6_output.c:176 dst_output include/net/dst.h:443 [inline] ip6_local_out+0x17b/0x1e0 net/ipv6/output_core.c:179 ip6_send_skb+0xfd/0x430 net/ipv6/ip6_output.c:1865 udp_v6_send_skb+0x14cc/0x21a0 net/ipv6/udp.c:1175 udp_v6_push_pending_frames net/ipv6/udp.c:1208 [inline] udpv6_sendmsg+0x22e0/0x55c0 net/ipv6/udp.c:1500 inet6_sendmsg+0x15b/0x1d0 net/ipv6/af_inet6.c:638 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg net/socket.c:672 [inline] sock_write_iter+0x575/0x670 net/socket.c:999 call_write_iter include/linux/fs.h:1908 [inline] new_sync_write fs/read_write.c:503 [inline] vfs_write+0xf9a/0x17c0 fs/read_write.c:578 ksys_write+0x275/0x500 fs/read_write.c:631 __do_sys_write fs/read_write.c:643 [inline] __se_sys_write+0x92/0xb0 fs/read_write.c:640 __ia32_sys_write+0x4a/0x70 fs/read_write.c:640 do_syscall_32_irqs_on arch/x86/entry/common.c:430 [inline] __do_fast_syscall_32+0x2af/0x480 arch/x86/entry/common.c:477 do_fast_syscall_32+0x6b/0xd0 arch/x86/entry/common.c:505 do_SYSENTER_32+0x73/0x90 arch/x86/entry/common.c:554 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c RIP: 0023:0xf7f24549 Code: Bad RIP value. RSP: 002b:00000000f551e0cc EFLAGS: 00000296 ORIG_RAX: 0000000000000004 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 Local variable ----ad@selinux_ip_postroute created at: selinux_ip_postroute+0xee/0x22b0 security/selinux/hooks.c:5691 selinux_ip_postroute+0xee/0x22b0 security/selinux/hooks.c:5691 =====================================================