================================================================== BUG: KMSAN: uninit-value in do_slab_free mm/slub.c:3016 [inline] BUG: KMSAN: uninit-value in slab_free mm/slub.c:3039 [inline] BUG: KMSAN: uninit-value in kmem_cache_free+0x3df/0x2b70 mm/slub.c:3054 CPU: 1 PID: 12349 Comm: syz-executor.1 Not tainted 5.3.0-rc7+ #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+0x191/0x1f0 lib/dump_stack.c:113 kmsan_report+0x162/0x2d0 mm/kmsan/kmsan_report.c:109 __msan_warning+0x75/0xe0 mm/kmsan/kmsan_instr.c:294 do_slab_free mm/slub.c:3016 [inline] slab_free mm/slub.c:3039 [inline] kmem_cache_free+0x3df/0x2b70 mm/slub.c:3054 kfree_skbmem net/core/skbuff.c:644 [inline] __kfree_skb net/core/skbuff.c:680 [inline] kfree_skb+0x473/0x4c0 net/core/skbuff.c:697 __udp6_lib_mcast_deliver net/ipv6/udp.c:804 [inline] __udp6_lib_rcv+0x3d0e/0x3ea0 net/ipv6/udp.c:904 udpv6_rcv+0x5c/0x70 net/ipv6/udp.c:1014 ip6_protocol_deliver_rcu+0x152e/0x22f0 net/ipv6/ip6_input.c:397 ip6_input_finish net/ipv6/ip6_input.c:438 [inline] NF_HOOK include/linux/netfilter.h:305 [inline] ip6_input net/ipv6/ip6_input.c:447 [inline] ip6_mc_input+0xdf2/0x1470 net/ipv6/ip6_input.c:541 dst_input include/net/dst.h:442 [inline] ip6_rcv_finish net/ipv6/ip6_input.c:76 [inline] NF_HOOK include/linux/netfilter.h:305 [inline] ipv6_rcv+0x683/0x710 net/ipv6/ip6_input.c:272 __netif_receive_skb_one_core net/core/dev.c:5004 [inline] __netif_receive_skb net/core/dev.c:5118 [inline] process_backlog+0x721/0x1410 net/core/dev.c:5929 napi_poll net/core/dev.c:6352 [inline] net_rx_action+0x74b/0x1950 net/core/dev.c:6418 __do_softirq+0x4a1/0x83a kernel/softirq.c:293 do_softirq_own_stack+0x49/0x80 arch/x86/entry/entry_64.S:1093 do_softirq+0xed/0x150 kernel/softirq.c:338 netif_rx_ni+0x208/0x3c0 net/core/dev.c:4562 dev_loopback_xmit+0x607/0x670 net/core/dev.c:3584 NF_HOOK include/linux/netfilter.h:305 [inline] ip6_finish_output2+0x236c/0x2670 net/ipv6/ip6_output.c:80 __ip6_finish_output+0x83d/0x8f0 net/ipv6/ip6_output.c:142 ip6_finish_output+0x2db/0x420 net/ipv6/ip6_output.c:152 NF_HOOK_COND include/linux/netfilter.h:294 [inline] ip6_output+0x5d3/0x720 net/ipv6/ip6_output.c:175 dst_output include/net/dst.h:436 [inline] ip6_local_out+0x164/0x1d0 net/ipv6/output_core.c:179 ip6_send_skb+0xfa/0x390 net/ipv6/ip6_output.c:1791 udp_v6_send_skb+0x1763/0x1d50 net/ipv6/udp.c:1167 udpv6_sendmsg+0x4315/0x4660 net/ipv6/udp.c:1464 inet6_sendmsg+0x276/0x2e0 net/ipv6/af_inet6.c:576 sock_sendmsg_nosec net/socket.c:637 [inline] sock_sendmsg net/socket.c:657 [inline] ___sys_sendmsg+0xe89/0x1590 net/socket.c:2311 __sys_sendmmsg+0x53a/0xae0 net/socket.c:2413 __do_sys_sendmmsg net/socket.c:2442 [inline] __se_sys_sendmmsg+0xbd/0xe0 net/socket.c:2439 __x64_sys_sendmmsg+0x56/0x70 net/socket.c:2439 do_syscall_64+0xbc/0xf0 arch/x86/entry/common.c:297 entry_SYSCALL_64_after_hwframe+0x63/0xe7 RIP: 0033:0x459a29 Code: fd b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 cb b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f3608fd2c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 0000000000459a29 RDX: 00000000000004ff RSI: 00000000200092c0 RDI: 0000000000000004 RBP: 000000000075bfc8 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f3608fd36d4 R13: 00000000004c7213 R14: 00000000004dca18 R15: 00000000ffffffff Uninit was stored to memory at: kmsan_save_stack_with_flags mm/kmsan/kmsan.c:174 [inline] kmsan_internal_chain_origin+0xcc/0x150 mm/kmsan/kmsan.c:332 __msan_chain_origin+0x6b/0xe0 mm/kmsan/kmsan_instr.c:190 ___slab_alloc+0x1dbc/0x1fb0 mm/slub.c:2634 __slab_alloc mm/slub.c:2687 [inline] slab_alloc_node mm/slub.c:2750 [inline] slab_alloc mm/slub.c:2799 [inline] kmem_cache_alloc+0xade/0xd10 mm/slub.c:2804 skb_clone+0x326/0x5d0 net/core/skbuff.c:1448 ip6_finish_output2+0x548/0x2670 net/ipv6/ip6_output.c:74 __ip6_finish_output+0x83d/0x8f0 net/ipv6/ip6_output.c:142 ip6_finish_output+0x2db/0x420 net/ipv6/ip6_output.c:152 NF_HOOK_COND include/linux/netfilter.h:294 [inline] ip6_output+0x5d3/0x720 net/ipv6/ip6_output.c:175 dst_output include/net/dst.h:436 [inline] ip6_local_out+0x164/0x1d0 net/ipv6/output_core.c:179 ip6_send_skb+0xfa/0x390 net/ipv6/ip6_output.c:1791 udp_v6_send_skb+0x1763/0x1d50 net/ipv6/udp.c:1167 udpv6_sendmsg+0x4315/0x4660 net/ipv6/udp.c:1464 inet6_sendmsg+0x276/0x2e0 net/ipv6/af_inet6.c:576 sock_sendmsg_nosec net/socket.c:637 [inline] sock_sendmsg net/socket.c:657 [inline] ___sys_sendmsg+0xe89/0x1590 net/socket.c:2311 __sys_sendmmsg+0x53a/0xae0 net/socket.c:2413 __do_sys_sendmmsg net/socket.c:2442 [inline] __se_sys_sendmmsg+0xbd/0xe0 net/socket.c:2439 __x64_sys_sendmmsg+0x56/0x70 net/socket.c:2439 do_syscall_64+0xbc/0xf0 arch/x86/entry/common.c:297 entry_SYSCALL_64_after_hwframe+0x63/0xe7 Uninit was created at: kmsan_save_stack_with_flags mm/kmsan/kmsan.c:174 [inline] kmsan_internal_poison_shadow+0x58/0xb0 mm/kmsan/kmsan.c:134 kmsan_slab_free+0x8d/0x100 mm/kmsan/kmsan_hooks.c:123 slab_free_freelist_hook mm/slub.c:1472 [inline] slab_free mm/slub.c:3038 [inline] kmem_cache_free_bulk+0x3ad9/0x3f50 mm/slub.c:3163 __kfree_skb_flush+0xb0/0x100 net/core/skbuff.c:862 net_rx_action+0x1908/0x1950 net/core/dev.c:6441 __do_softirq+0x4a1/0x83a kernel/softirq.c:293 invoke_softirq kernel/softirq.c:375 [inline] irq_exit+0x230/0x280 kernel/softirq.c:416 exiting_irq arch/x86/include/asm/apic.h:537 [inline] do_IRQ+0x20d/0x3a0 arch/x86/kernel/irq.c:259 ret_from_intr+0x0/0x33 native_safe_halt arch/x86/include/asm/irqflags.h:60 [inline] arch_safe_halt arch/x86/include/asm/irqflags.h:103 [inline] default_idle+0x53/0x90 arch/x86/kernel/process.c:580 arch_cpu_idle+0x25/0x30 arch/x86/kernel/process.c:571 default_idle_call kernel/sched/idle.c:94 [inline] cpuidle_idle_call kernel/sched/idle.c:154 [inline] do_idle+0x1d7/0x790 kernel/sched/idle.c:263 cpu_startup_entry+0x45/0x50 kernel/sched/idle.c:354 start_secondary+0x370/0x470 arch/x86/kernel/smpboot.c:264 secondary_startup_64+0xa4/0xb0 arch/x86/kernel/head_64.S:241 ==================================================================