================================================================== BUG: KASAN: user-memory-access in atomic_read include/asm-generic/atomic-instrumented.h:26 [inline] BUG: KASAN: user-memory-access in atomic_fetch_add_unless include/linux/atomic-fallback.h:1086 [inline] BUG: KASAN: user-memory-access in atomic_add_unless include/linux/atomic-fallback.h:1111 [inline] BUG: KASAN: user-memory-access in atomic_inc_not_zero include/linux/atomic-fallback.h:1127 [inline] BUG: KASAN: user-memory-access in dst_hold_safe include/net/dst.h:297 [inline] BUG: KASAN: user-memory-access in ip6_hold_safe+0xad/0x380 net/ipv6/route.c:1050 Read of size 4 at addr 000000010000003f by task syz-executor.5/14468 CPU: 1 PID: 14468 Comm: syz-executor.5 Not tainted 5.2.0-rc2+ #22 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+0x172/0x1f0 lib/dump_stack.c:113 __kasan_report.cold+0x5/0x40 mm/kasan/report.c:321 kasan_report+0x12/0x20 mm/kasan/common.c:614 check_memory_region_inline mm/kasan/generic.c:185 [inline] check_memory_region+0x123/0x190 mm/kasan/generic.c:191 kasan_check_read+0x11/0x20 mm/kasan/common.c:94 atomic_read include/asm-generic/atomic-instrumented.h:26 [inline] atomic_fetch_add_unless include/linux/atomic-fallback.h:1086 [inline] atomic_add_unless include/linux/atomic-fallback.h:1111 [inline] atomic_inc_not_zero include/linux/atomic-fallback.h:1127 [inline] dst_hold_safe include/net/dst.h:297 [inline] ip6_hold_safe+0xad/0x380 net/ipv6/route.c:1050 rt6_get_pcpu_route net/ipv6/route.c:1277 [inline] ip6_pol_route+0x336/0x1010 net/ipv6/route.c:2028 ip6_pol_route_output+0x54/0x70 net/ipv6/route.c:2204 fib6_rule_lookup+0x279/0x5a0 net/ipv6/fib6_rules.c:120 ip6_route_output_flags+0x2c4/0x350 net/ipv6/route.c:2233 ip6_dst_lookup_tail+0x1124/0x1b30 net/ipv6/ip6_output.c:1054 ip6_dst_lookup+0x4d/0x70 net/ipv6/ip6_output.c:1134 icmpv6_route_lookup+0x346/0x4d0 net/ipv6/icmp.c:377 icmp6_send+0x12b8/0x1e50 net/ipv6/icmp.c:556 icmpv6_send+0xec/0x230 net/ipv6/ip6_icmp.c:43 __udp6_lib_rcv+0x1ad1/0x2cc0 net/ipv6/udp.c:938 udpv6_rcv+0x22/0x30 net/ipv6/udp.c:1027 ip6_protocol_deliver_rcu+0x2fe/0x16c0 net/ipv6/ip6_input.c:401 ip6_input_finish+0x84/0x170 net/ipv6/ip6_input.c:442 NF_HOOK include/linux/netfilter.h:305 [inline] NF_HOOK include/linux/netfilter.h:299 [inline] ip6_input+0xe4/0x3f0 net/ipv6/ip6_input.c:451 dst_input include/net/dst.h:439 [inline] ip6_rcv_finish+0x1de/0x310 net/ipv6/ip6_input.c:80 NF_HOOK include/linux/netfilter.h:305 [inline] NF_HOOK include/linux/netfilter.h:299 [inline] ipv6_rcv+0x10e/0x420 net/ipv6/ip6_input.c:276 __netif_receive_skb_one_core+0x113/0x1a0 net/core/dev.c:4985 __netif_receive_skb+0x2c/0x1d0 net/core/dev.c:5099 process_backlog+0x206/0x750 net/core/dev.c:5910 napi_poll net/core/dev.c:6333 [inline] net_rx_action+0x4f5/0x1070 net/core/dev.c:6399 __do_softirq+0x25c/0x94c kernel/softirq.c:293 do_softirq_own_stack+0x2a/0x40 arch/x86/entry/entry_64.S:1040 do_softirq.part.0+0x11a/0x170 kernel/softirq.c:338 do_softirq kernel/softirq.c:330 [inline] __local_bh_enable_ip+0x211/0x270 kernel/softirq.c:190 local_bh_enable include/linux/bottom_half.h:32 [inline] rcu_read_unlock_bh include/linux/rcupdate.h:684 [inline] ip6_finish_output2+0x10a0/0x2550 net/ipv6/ip6_output.c:121 __ip6_finish_output+0x444/0xaa0 net/ipv6/ip6_output.c:146 ip6_finish_output+0x38/0x1f0 net/ipv6/ip6_output.c:156 NF_HOOK_COND include/linux/netfilter.h:294 [inline] ip6_output+0x235/0x7f0 net/ipv6/ip6_output.c:179 dst_output include/net/dst.h:433 [inline] ip6_local_out+0xbb/0x1b0 net/ipv6/output_core.c:179 ip6_send_skb+0xbb/0x350 net/ipv6/ip6_output.c:1796 udp_v6_send_skb.isra.0+0x839/0x14f0 net/ipv6/udp.c:1180 udpv6_sendmsg+0x21e0/0x28d0 net/ipv6/udp.c:1477 inet_sendmsg+0x141/0x5d0 net/ipv4/af_inet.c:802 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg+0xd7/0x130 net/socket.c:671 ___sys_sendmsg+0x803/0x920 net/socket.c:2292 __sys_sendmsg+0x105/0x1d0 net/socket.c:2330 __do_sys_sendmsg net/socket.c:2339 [inline] __se_sys_sendmsg net/socket.c:2337 [inline] __x64_sys_sendmsg+0x78/0xb0 net/socket.c:2337 do_syscall_64+0xfd/0x680 arch/x86/entry/common.c:301 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4592c9 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:00007f67209e3c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00000000004592c9 RDX: 0000000000000000 RSI: 0000000020002b80 RDI: 0000000000000003 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f67209e46d4 R13: 00000000004c6f76 R14: 00000000004dc0b0 R15: 00000000ffffffff ==================================================================