RDX: 00007f3c507fc510 RSI: 000000004020ae46 RDI: 0000000000000004 RBP: 000000002000c000 R08: 00007f3c507fc070 R09: 000000000078bf00 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000fec00000 R13: 0000000000000004 R14: 00000000004cdffa R15: 00007f3c507fe6d4 Uninit was stored to memory 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+0x148/0x8e0 kernel/kallsyms.c:290 CPU: 1 PID: 893 Comm: syz-executor.0 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:118 __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+0x148/0x8e0 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+0xf5/0x190 mm/kmsan/kmsan_report.c:52 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 kvm_memslot_move_forward arch/x86/kvm/../../../virt/kvm/kvm_main.c:961 [inline] update_memslots arch/x86/kvm/../../../virt/kvm/kvm_main.c:1021 [inline] kvm_set_memslot+0x15b8/0x1b90 arch/x86/kvm/../../../virt/kvm/kvm_main.c:1152 __kvm_set_memory_region+0x1b3b/0x1dc0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:1300 kvm_set_memory_region arch/x86/kvm/../../../virt/kvm/kvm_main.c:1321 [inline] kvm_vm_ioctl_set_memory_region arch/x86/kvm/../../../virt/kvm/kvm_main.c:1333 [inline] kvm_vm_ioctl+0x131c/0x4350 arch/x86/kvm/../../../virt/kvm/kvm_main.c:3604 vfs_ioctl fs/ioctl.c:47 [inline] ksys_ioctl fs/ioctl.c:771 [inline] __do_sys_ioctl fs/ioctl.c:780 [inline] __se_sys_ioctl+0x2e9/0x410 fs/ioctl.c:778 __x64_sys_ioctl+0x4a/0x70 fs/ioctl.c:778 do_syscall_64+0xb8/0x160 arch/x86/entry/common.c:297 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45c6f7 Code: 48 83 c4 08 48 89 d8 5b 5d c3 66 0f 1f 84 00 00 00 00 00 48 89 e8 48 f7 d8 48 39 c3 0f 92 c0 eb 92 66 90 b8 10 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 0d b8 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f3c507fc068 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 000000000000000d RCX: 000000000045c6f7 RDX: 00007f3c507fc510 RSI: 000000004020ae46 RDI: 0000000000000004 RBP: 000000002000c000 R08: 00007f3c507fc070 R09: 000000000078bf00 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000fec00000 R13: 0000000000000004 R14: 00000000004cdffa R15: 00007f3c507fe6d4 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:280 [inline] kmsan_alloc_page+0xb9/0x180 mm/kmsan/kmsan_shadow.c:304 __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] stack_depot_save+0x3dd/0x490 lib/stackdepot.c:301 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:150 [inline] kmsan_internal_chain_origin+0xc6/0x130 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+0x4aa/0x1b00 net/core/skbuff.c:1638 netlink_trim+0x35d/0x3b0 net/netlink/af_netlink.c:1285 netlink_broadcast_filtered+0x145/0x1d80 net/netlink/af_netlink.c:1490 netlink_broadcast+0xf6/0x110 net/netlink/af_netlink.c:1535 rtnetlink_send+0x2bd/0x340 net/core/rtnetlink.c:714 qdisc_notify+0x596/0x660 net/sched/sch_api.c:986 notify_and_destroy net/sched/sch_api.c:999 [inline] qdisc_graft+0x173d/0x1ec0 net/sched/sch_api.c:1074 tc_modify_qdisc+0x1834/0x31c0 net/sched/sch_api.c:1670 rtnetlink_rcv_msg+0x1153/0x1570 net/core/rtnetlink.c:5454 netlink_rcv_skb+0x451/0x650 net/netlink/af_netlink.c:2469 rtnetlink_rcv+0x50/0x60 net/core/rtnetlink.c:5472 netlink_unicast_kernel net/netlink/af_netlink.c:1303 [inline] netlink_unicast+0xf9e/0x1100 net/netlink/af_netlink.c:1329 netlink_sendmsg+0x1246/0x14d0 net/netlink/af_netlink.c:1918 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg net/socket.c:672 [inline] ____sys_sendmsg+0x12b6/0x1350 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 =====================================================