syzbot

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BUG: KMSAN: uninit-value in alloc_vmap_area+0x524/0x15a0 mm/vmalloc.c:441
CPU: 1 PID: 4524 Comm: syz-executor3 Not tainted 4.17.0+ #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+0x185/0x1d0 lib/dump_stack.c:113
 kmsan_report+0x188/0x2a0 mm/kmsan/kmsan.c:1125
 __msan_warning_32+0x70/0xc0 mm/kmsan/kmsan_instr.c:620
 alloc_vmap_area+0x524/0x15a0 mm/vmalloc.c:441
 __get_vm_area_node+0x3a6/0x810 mm/vmalloc.c:1409
 __vmalloc_node_range+0x2a7/0x1170 mm/vmalloc.c:1754
 __vmalloc_node mm/vmalloc.c:1804 [inline]
 __vmalloc_node_flags mm/vmalloc.c:1818 [inline]
 vzalloc+0xd8/0xf0 mm/vmalloc.c:1857
 alloc_counters+0x99/0x920 net/ipv6/netfilter/ip6_tables.c:819
 copy_entries_to_user net/ipv4/netfilter/arp_tables.c:674 [inline]
 get_entries net/ipv4/netfilter/arp_tables.c:861 [inline]
 do_arpt_get_ctl+0x7da/0xe60 net/ipv4/netfilter/arp_tables.c:1482
 nf_sockopt net/netfilter/nf_sockopt.c:104 [inline]
 nf_getsockopt+0x481/0x4e0 net/netfilter/nf_sockopt.c:122
 ip_getsockopt+0x284/0x3c0 net/ipv4/ip_sockglue.c:1562
 tcp_getsockopt+0x1c6/0x1f0 net/ipv4/tcp.c:3349
 sock_common_getsockopt+0x13f/0x180 net/core/sock.c:2998
 __sys_getsockopt+0x48c/0x550 net/socket.c:1940
 __do_sys_getsockopt net/socket.c:1951 [inline]
 __se_sys_getsockopt net/socket.c:1948 [inline]
 __x64_sys_getsockopt+0x15d/0x1c0 net/socket.c:1948
 do_syscall_64+0x15b/0x230 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45858a
RSP: 002b:0000000000a3eab8 EFLAGS: 00000212 ORIG_RAX: 0000000000000037
RAX: ffffffffffffffda RBX: 0000000000a3eae0 RCX: 000000000045858a
RDX: 0000000000000061 RSI: 0000000000000000 RDI: 0000000000000013
RBP: 0000000000000013 R08: 0000000000a3eadc R09: 0000000000000001
R10: 0000000000a3f160 R11: 0000000000000212 R12: 0000000000000000
R13: 0000000000001380 R14: 0000000000a3f160 R15: 00000000007024c0

Uninit was stored to memory at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:282 [inline]
 kmsan_save_stack mm/kmsan/kmsan.c:297 [inline]
 kmsan_internal_chain_origin+0x12b/0x210 mm/kmsan/kmsan.c:689
 __msan_chain_origin+0x69/0xc0 mm/kmsan/kmsan_instr.c:464
 alloc_vmap_area+0x98d/0x15a0 mm/vmalloc.c:451
 __get_vm_area_node+0x3a6/0x810 mm/vmalloc.c:1409
 __vmalloc_node_range+0x2a7/0x1170 mm/vmalloc.c:1754
 __vmalloc_node mm/vmalloc.c:1804 [inline]
 __vmalloc_node_flags mm/vmalloc.c:1818 [inline]
 vmalloc+0xd8/0xf0 mm/vmalloc.c:1840
 snd_pcm_oss_change_params_locked+0x631b/0x6940 sound/core/oss/pcm_oss.c:1066
 snd_pcm_oss_change_params sound/core/oss/pcm_oss.c:1101 [inline]
 snd_pcm_oss_make_ready+0x184/0x4f0 sound/core/oss/pcm_oss.c:1160
 snd_pcm_oss_sync+0x433/0x1120 sound/core/oss/pcm_oss.c:1721
 snd_pcm_oss_release+0x13a/0x4c0 sound/core/oss/pcm_oss.c:2560
 __fput+0x458/0xa30 fs/file_table.c:209
 ____fput+0x37/0x40 fs/file_table.c:243
 task_work_run+0x22e/0x2b0 kernel/task_work.c:113
 exit_task_work include/linux/task_work.h:22 [inline]
 do_exit+0x110e/0x3930 kernel/exit.c:867
 do_group_exit+0x1a0/0x360 kernel/exit.c:970
 get_signal+0x1405/0x1ec0 kernel/signal.c:2482
 do_signal+0xb8/0x1d20 arch/x86/kernel/signal.c:810
 exit_to_usermode_loop arch/x86/entry/common.c:162 [inline]
 prepare_exit_to_usermode+0x271/0x3a0 arch/x86/entry/common.c:196
 syscall_return_slowpath+0xe9/0x710 arch/x86/entry/common.c:265
 do_syscall_64+0x1ad/0x230 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Local variable description: ----flags.i.i.i.i@_raw_spin_lock_irqsave
Variable was created at:
 _raw_spin_lock_irqsave+0x45/0xf0 kernel/locking/spinlock.c:150
 try_to_wake_up+0x107/0x2260 kernel/sched/core.c:1985
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