__x64_sys_sendto+0x6e/0x90 net/socket.c:2008 do_syscall_64+0xb8/0x160 arch/x86/entry/common.c:297 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Uninit was created at: ===================================================== BUG: KMSAN: uninit-value in is_kernel include/linux/kallsyms.h:41 [inline] BUG: KMSAN: uninit-value in is_ksym_addr include/linux/kallsyms.h:49 [inline] BUG: KMSAN: uninit-value in kallsyms_lookup+0x148/0x770 kernel/kallsyms.c:290 CPU: 1 PID: 25744 Comm: syz-executor.2 Not tainted 5.7.0-rc4-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+0x1c9/0x220 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 is_kernel include/linux/kallsyms.h:41 [inline] is_ksym_addr include/linux/kallsyms.h:49 [inline] kallsyms_lookup+0x148/0x770 kernel/kallsyms.c:290 __sprint_symbol+0x140/0x590 kernel/kallsyms.c:363 sprint_symbol+0x7c/0x90 kernel/kallsyms.c:394 symbol_string+0x157/0x420 lib/vsprintf.c:961 pointer+0x1560/0x1e40 lib/vsprintf.c:2188 vsnprintf+0x1a2a/0x31b0 lib/vsprintf.c:2578 vscnprintf+0xc2/0x180 lib/vsprintf.c:2677 vprintk_store+0xef/0x11d0 kernel/printk/printk.c:1942 vprintk_emit+0x2c0/0x8b0 kernel/printk/printk.c:2009 vprintk_default+0x90/0xa0 kernel/printk/printk.c:2054 vprintk_func+0x1ec/0x220 kernel/printk/printk_safe.c:385 printk+0x18b/0x1d3 kernel/printk/printk.c:2087 stack_trace_print+0x1b1/0x1f0 kernel/stacktrace.c:32 kmsan_print_origin+0x1a0/0x1b0 mm/kmsan/kmsan_report.c:62 kmsan_internal_chain_origin+0x76/0x130 mm/kmsan/kmsan.c:302 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 skb_copy_from_linear_data_offset include/linux/skbuff.h:3662 [inline] skb_copy_bits+0x217/0xdd0 net/core/skbuff.c:2200 tcp_collapse+0x1a15/0x25e0 net/ipv4/tcp_input.c:5002 tcp_prune_queue net/ipv4/tcp_input.c:5149 [inline] tcp_try_rmem_schedule+0x12b7/0x1f10 net/ipv4/tcp_input.c:4544 tcp_data_queue_ofo net/ipv4/tcp_input.c:4565 [inline] tcp_data_queue+0xcd1/0x9c40 net/ipv4/tcp_input.c:4869 tcp_rcv_established+0x13d5/0x31e0 net/ipv4/tcp_input.c:5727 tcp_v4_do_rcv+0x6ce/0xd70 net/ipv4/tcp_ipv4.c:1621 tcp_v4_rcv+0x4c77/0x5040 net/ipv4/tcp_ipv4.c:2003 ip_protocol_deliver_rcu+0x4b7/0xbc0 net/ipv4/ip_input.c:204 ip_local_deliver_finish net/ipv4/ip_input.c:231 [inline] NF_HOOK include/linux/netfilter.h:307 [inline] ip_local_deliver+0x62a/0x7c0 net/ipv4/ip_input.c:252 dst_input include/net/dst.h:441 [inline] ip_rcv_finish net/ipv4/ip_input.c:428 [inline] NF_HOOK include/linux/netfilter.h:307 [inline] ip_rcv+0x6cf/0x750 net/ipv4/ip_input.c:539 __netif_receive_skb_one_core net/core/dev.c:5188 [inline] __netif_receive_skb net/core/dev.c:5302 [inline] process_backlog+0xf0b/0x1410 net/core/dev.c:6134 napi_poll net/core/dev.c:6572 [inline] net_rx_action+0x786/0x1aa0 net/core/dev.c:6640 __do_softirq+0x311/0x83d kernel/softirq.c:293 invoke_softirq kernel/softirq.c:375 [inline] irq_exit+0x230/0x280 kernel/softirq.c:416 exiting_irq+0xe/0x10 arch/x86/include/asm/apic.h:546 smp_apic_timer_interrupt+0x48/0x70 arch/x86/kernel/apic/apic.c:1143 apic_timer_interrupt+0x2e/0x40 arch/x86/entry/entry_64.S:834 RIP: 0010:link_path_walk+0x3e/0x1160 fs/namei.c:2092 Code: 49 89 f6 48 89 7d 80 65 48 8b 04 25 28 00 00 00 48 89 45 d0 e8 23 cc e9 ff 48 8b 08 48 89 4d a8 48 8b 58 08 8b 88 88 0c 00 00 <89> 4d b4 48 89 45 88 8b 80 90 0c 00 00 89 45 bc e8 7d e8 7e ff 4d RSP: 0018:ffffa08ac1013a90 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13 RAX: ffff920ea5762858 RBX: 0000000000000000 RCX: 00000000066300b8 RDX: 0000000000000000 RSI: ffffa08ac1013c28 RDI: ffff920e905b2020 RBP: ffffa08ac1013b88 R08: fffff6548000000f R09: ffff920eafffb000 R10: 0000000000000003 R11: 00000000ffffffff R12: 0000000000000000 R13: 0000000000000000 R14: ffffa08ac1013c28 R15: 0000000000000000 path_parentat fs/namei.c:2371 [inline] filename_parentat+0x307/0x19b0 fs/namei.c:2393 filename_create+0x165/0xae0 fs/namei.c:3427 user_path_create fs/namei.c:3502 [inline] do_symlinkat+0x1ae/0x850 fs/namei.c:3957 __do_sys_symlink fs/namei.c:3983 [inline] __se_sys_symlink+0x74/0x90 fs/namei.c:3981 __x64_sys_symlink+0x3e/0x60 fs/namei.c:3981 do_syscall_64+0xb8/0x160 arch/x86/entry/common.c:297 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45c7e7 Code: 0f 1f 00 b8 5c 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 6d b9 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 b8 58 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 4d b9 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:0000000000c9fda8 EFLAGS: 00000202 ORIG_RAX: 0000000000000058 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000045c7e7 RDX: 0000000000c9fe47 RSI: 00000000004c258f RDI: 0000000000c9fe30 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000017 R10: 0000000000000075 R11: 0000000000000202 R12: 0000000000000000 R13: 0000000000c9fde0 R14: 0000000000000000 R15: 0000000000c9fdf0 Uninit was created at: kmsan_save_stack_with_flags+0x3c/0x90 mm/kmsan/kmsan.c:144 kmsan_internal_alloc_meta_for_pages mm/kmsan/kmsan_shadow.c:269 [inline] kmsan_alloc_page+0xb9/0x180 mm/kmsan/kmsan_shadow.c:293 __alloc_pages_nodemask+0x56a2/0x5dc0 mm/page_alloc.c:4848 alloc_pages_current+0x67d/0x990 mm/mempolicy.c:2295 alloc_pages include/linux/gfp.h:540 [inline] skb_page_frag_refill+0x2b9/0x590 net/core/sock.c:2397 sk_page_frag_refill+0xa4/0x330 net/core/sock.c:2417 __ip6_append_data+0x2566/0x63e0 net/ipv6/ip6_output.c:1676 ip6_append_data+0x3cb/0x660 net/ipv6/ip6_output.c:1757 rawv6_sendmsg+0x32bb/0x5c30 net/ipv6/raw.c:949 inet_sendmsg+0x2d8/0x2e0 net/ipv4/af_inet.c:807 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg net/socket.c:672 [inline] ____sys_sendmsg+0x1056/0x1350 net/socket.c:2362 ___sys_sendmsg net/socket.c:2416 [inline] __sys_sendmsg+0x623/0x750 net/socket.c:2449 __do_sys_sendmsg net/socket.c:2458 [inline] __se_sys_sendmsg+0x97/0xb0 net/socket.c:2456 __x64_sys_sendmsg+0x4a/0x70 net/socket.c:2456 do_syscall_64+0xb8/0x160 arch/x86/entry/common.c:297 entry_SYSCALL_64_after_hwframe+0x44/0xa9 =====================================================