syzbot

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BUG: KMSAN: uninit-value in rmap_get_first arch/x86/kvm/mmu.c:1412 [inline]
BUG: KMSAN: uninit-value in __rmap_write_protect+0x6a9/0x7a0 arch/x86/kvm/mmu.c:1534
CPU: 0 PID: 13215 Comm: syz-executor.1 Not tainted 5.0.0-rc1+ #9
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+0x173/0x1d0 lib/dump_stack.c:113
 kmsan_report+0x12e/0x2a0 mm/kmsan/kmsan.c:600
 __msan_warning+0x82/0xf0 mm/kmsan/kmsan_instr.c:313
 rmap_get_first arch/x86/kvm/mmu.c:1412 [inline]
 __rmap_write_protect+0x6a9/0x7a0 arch/x86/kvm/mmu.c:1534
 kvm_mmu_write_protect_pt_masked arch/x86/kvm/mmu.c:1625 [inline]
 kvm_arch_mmu_enable_log_dirty_pt_masked+0x1c0/0x230 arch/x86/kvm/mmu.c:1677
 kvm_clear_dirty_log_protect+0x9ac/0xaa0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:1276
 kvm_vm_ioctl_clear_dirty_log+0x143/0x210 arch/x86/kvm/x86.c:4468
 kvm_vm_ioctl+0xe48/0x2df0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:3126
 do_vfs_ioctl+0xebd/0x2bf0 fs/ioctl.c:46
 ksys_ioctl fs/ioctl.c:713 [inline]
 __do_sys_ioctl fs/ioctl.c:720 [inline]
 __se_sys_ioctl+0x1da/0x270 fs/ioctl.c:718
 __x64_sys_ioctl+0x4a/0x70 fs/ioctl.c:718
 do_syscall_64+0xbc/0xf0 arch/x86/entry/common.c:291
 entry_SYSCALL_64_after_hwframe+0x63/0xe7
RIP: 0033:0x457e39
Code: ad b8 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 7b b8 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f525973bc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000457e39
RDX: 0000000020bf7000 RSI: 00000000c018aec0 RDI: 0000000000000004
RBP: 000000000073bfa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f525973c6d4
R13: 00000000004ca220 R14: 00000000004d2db8 R15: 00000000ffffffff

Uninit was created at:
 kmsan_save_stack_with_flags+0x7a/0x130 mm/kmsan/kmsan.c:205
 kmsan_internal_alloc_meta_for_pages+0x113/0x580 mm/kmsan/kmsan_hooks.c:98
 kmsan_alloc_page+0x7e/0x100 mm/kmsan/kmsan_hooks.c:396
 __alloc_pages_nodemask+0x137b/0x5e30 mm/page_alloc.c:4572
 __alloc_pages include/linux/gfp.h:475 [inline]
 __alloc_pages_node include/linux/gfp.h:488 [inline]
 alloc_slab_page mm/slub.c:1494 [inline]
 allocate_slab mm/slub.c:1637 [inline]
 new_slab+0x315/0x20b0 mm/slub.c:1711
 new_slab_objects mm/slub.c:2465 [inline]
 ___slab_alloc+0x1577/0x2060 mm/slub.c:2617
 __slab_alloc mm/slub.c:2657 [inline]
 slab_alloc_node mm/slub.c:2720 [inline]
 __kmalloc_node+0xdbf/0x1030 mm/slub.c:3848
 kmalloc_node include/linux/slab.h:588 [inline]
 kvmalloc_node+0x19f/0x3d0 mm/util.c:416
 xt_jumpstack_alloc net/netfilter/x_tables.c:1328 [inline]
 xt_replace_table+0x34e/0xb80 net/netfilter/x_tables.c:1367
 __do_replace+0x2c5/0xf70 net/ipv6/netfilter/ip6_tables.c:1087
 do_replace net/ipv6/netfilter/ip6_tables.c:1160 [inline]
 do_ip6t_set_ctl+0x750/0x9d0 net/ipv6/netfilter/ip6_tables.c:1684
 nf_sockopt net/netfilter/nf_sockopt.c:106 [inline]
 nf_setsockopt+0x47c/0x4e0 net/netfilter/nf_sockopt.c:115
 ipv6_setsockopt+0x1e2/0x350 net/ipv6/ipv6_sockglue.c:945
 tcp_setsockopt+0x1c0/0x1f0 net/ipv4/tcp.c:3068
 sock_common_setsockopt+0x13b/0x170 net/core/sock.c:2991
 __sys_setsockopt+0x493/0x540 net/socket.c:1902
 __do_sys_setsockopt net/socket.c:1913 [inline]
 __se_sys_setsockopt+0xdd/0x100 net/socket.c:1910
 __x64_sys_setsockopt+0x62/0x80 net/socket.c:1910
 do_syscall_64+0xbc/0xf0 arch/x86/entry/common.c:291
 entry_SYSCALL_64_after_hwframe+0x63/0xe7
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