On Tue, Aug 22, 2023 at 01:57:53AM +0000, mengkanglai wrote: > Hello: > I am doing some fuzz test for kernel, the following bug was triggered. > My kernel version is 5.10.0.Have you encountered similar problems? > If there is a fix, please let me know. > Thank you very much. What fuzz test? > > ---------------------------------------------- > BUG: KASAN: slab-out-of-bounds in do_csum+0x3e9/0x400 usr/src/kernels/linux-5.10.0-136.12.0.86/arch/x86/lib/csum-partial_64.c:103 > Read of size 4 at addr ffff88801f183aa0 by task syz-executor.2/19784 > > CPU: 0 PID: 19784 Comm: syz-executor.2 Tainted: G W OE 5.10.0-136.12.0.86.x86_64 #1 > Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.13.0-1ubuntu1.1 04/01/2014 > Call Trace: > __dump_stack usr/src/kernels/linux-5.10.0-136.12.0.86/lib/dump_stack.c:77 [inline] > dump_stack+0xbe/0xfd usr/src/kernels/linux-5.10.0-136.12.0.86/lib/dump_stack.c:118 > print_address_description.constprop.0+0x19/0x170 usr/src/kernels/linux-5.10.0-136.12.0.86/mm/kasan/report.c:382 > __kasan_report.cold+0x6c/0x84 usr/src/kernels/linux-5.10.0-136.12.0.86/mm/kasan/report.c:542 > kasan_report+0x3a/0x50 usr/src/kernels/linux-5.10.0-136.12.0.86/mm/kasan/report.c:559 > do_csum+0x3e9/0x400 usr/src/kernels/linux-5.10.0-136.12.0.86/arch/x86/lib/csum-partial_64.c:103 > csum_partial+0x21/0x30 usr/src/kernels/linux-5.10.0-136.12.0.86/arch/x86/lib/csum-partial_64.c:136 > gso_make_checksum usr/src/kernels/linux-5.10.0-136.12.0.86/./include/linux/skbuff.h:4527 [inline] > __skb_udp_tunnel_segment+0xcd9/0x1710 usr/src/kernels/linux-5.10.0-136.12.0.86/net/ipv4/udp_offload.c:135 > skb_udp_tunnel_segment+0x192/0x240 usr/src/kernels/linux-5.10.0-136.12.0.86/net/ipv4/udp_offload.c:177 > udp6_ufo_fragment+0x9a5/0xd20 usr/src/kernels/linux-5.10.0-136.12.0.86/net/ipv6/udp_offload.c:37 > ipv6_gso_segment+0x485/0xfc0 usr/src/kernels/linux-5.10.0-136.12.0.86/net/ipv6/ip6_offload.c:115 > skb_mac_gso_segment+0x22e/0x400 usr/src/kernels/linux-5.10.0-136.12.0.86/net/core/dev.c:3348 > __skb_gso_segment+0x331/0x6f0 usr/src/kernels/linux-5.10.0-136.12.0.86/net/core/dev.c:3445 > skb_gso_segment usr/src/kernels/linux-5.10.0-136.12.0.86/./include/linux/netdevice.h:4799 [inline] > ip6_finish_output_gso_slowpath_drop.constprop.0+0x3f/0x170 usr/src/kernels/linux-5.10.0-136.12.0.86/net/ipv6/ip6_output.c:169 > __ip6_finish_output.part.0+0x6a5/0x7c0 usr/src/kernels/linux-5.10.0-136.12.0.86/net/ipv6/ip6_output.c:203 > __ip6_finish_output usr/src/kernels/linux-5.10.0-136.12.0.86/net/ipv6/ip6_output.c:225 [inline] > ip6_finish_output+0x25c/0x310 usr/src/kernels/linux-5.10.0-136.12.0.86/net/ipv6/ip6_output.c:220 > NF_HOOK_COND usr/src/kernels/linux-5.10.0-136.12.0.86/./include/linux/netfilter.h:293 [inline] > ip6_output+0x1f3/0x3f0 usr/src/kernels/linux-5.10.0-136.12.0.86/net/ipv6/ip6_output.c:243 > dst_output usr/src/kernels/linux-5.10.0-136.12.0.86/./include/net/dst.h:453 [inline] > ip6_local_out+0x94/0xc0 usr/src/kernels/linux-5.10.0-136.12.0.86/net/ipv6/output_core.c:161 > ip6tunnel_xmit usr/src/kernels/linux-5.10.0-136.12.0.86/./include/net/ip6_tunnel.h:160 [inline] > udp_tunnel6_xmit_skb+0x695/0xa90 usr/src/kernels/linux-5.10.0-136.12.0.86/net/ipv6/ip6_udp_tunnel.c:109 > geneve6_xmit_skb+0xaf8/0x1b50 usr/src/kernels/linux-5.10.0-136.12.0.86/drivers/net/geneve.c:1051 > geneve_xmit+0x2f5/0x4f0 usr/src/kernels/linux-5.10.0-136.12.0.86/drivers/net/geneve.c:1080 > __netdev_start_xmit usr/src/kernels/linux-5.10.0-136.12.0.86/./include/linux/netdevice.h:4849 [inline] > netdev_start_xmit usr/src/kernels/linux-5.10.0-136.12.0.86/./include/linux/netdevice.h:4863 [inline] > xmit_one.constprop.0+0x142/0x490 usr/src/kernels/linux-5.10.0-136.12.0.86/net/core/dev.c:3615 > dev_hard_start_xmit+0x8e/0x1b0 usr/src/kernels/linux-5.10.0-136.12.0.86/net/core/dev.c:3631 > __dev_queue_xmit+0x1935/0x2100 usr/src/kernels/linux-5.10.0-136.12.0.86/net/core/dev.c:4198 > packet_snd+0x1992/0x2a40 usr/src/kernels/linux-5.10.0-136.12.0.86/net/packet/af_packet.c:3031 > packet_sendmsg+0x9f/0xd0 usr/src/kernels/linux-5.10.0-136.12.0.86/net/packet/af_packet.c:3063 > sock_sendmsg_nosec usr/src/kernels/linux-5.10.0-136.12.0.86/net/socket.c:658 [inline] > sock_sendmsg usr/src/kernels/linux-5.10.0-136.12.0.86/net/socket.c:678 [inline] > sock_sendmsg+0x165/0x1a0 usr/src/kernels/linux-5.10.0-136.12.0.86/net/socket.c:673 > __sys_sendto+0x21b/0x320 usr/src/kernels/linux-5.10.0-136.12.0.86/net/socket.c:1993 > __do_sys_sendto usr/src/kernels/linux-5.10.0-136.12.0.86/net/socket.c:2005 [inline] > __se_sys_sendto usr/src/kernels/linux-5.10.0-136.12.0.86/net/socket.c:2001 [inline] > __x64_sys_sendto+0xe2/0x1c0 usr/src/kernels/linux-5.10.0-136.12.0.86/net/socket.c:2001 > do_syscall_64+0x33/0x40 usr/src/kernels/linux-5.10.0-136.12.0.86/arch/x86/entry/common.c:46 > entry_SYSCALL_64_after_hwframe+0x61/0xc6 > RIP: 0033:0x7f6bf67ac74d > Code: c3 e8 17 32 00 00 0f 1f 80 00 00 00 00 f3 0f 1e fa 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 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 > RSP: 002b:00007f6bf4d19bf8 EFLAGS: 00000246 ORIG_RAX: 000000000000002c > RAX: ffffffffffffffda RBX: 00007f6bf68e7f80 RCX: 00007f6bf67ac74d > RDX: 0000000000002378 RSI: 0000000020000080 RDI: 0000000000000003 > RBP: 00007f6bf681ad95 R08: 0000000000000000 R09: 00000000000002ff > R10: 0000000004000002 R11: 0000000000000246 R12: 0000000000000000 > R13: 00007ffe99543bff R14: 00007ffe99543da0 R15: 00007f6bf4d19d80 Can you reproduce above on latest mainline (currently v6.5-rc7)? Also, it seems like you have external modules installed, hence your kernel is tainted. Please try vanilla (untainted) kernel instead, preferably by building kernel from kernel.org sources. Thanks. -- An old man doll... just what I always wanted! - Clara