syzbot

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BUG: KMSAN: uninit-value in __rmqueue_pcplist mm/page_alloc.c:2944 [inline]
BUG: KMSAN: uninit-value in rmqueue_pcplist mm/page_alloc.c:2973 [inline]
BUG: KMSAN: uninit-value in rmqueue mm/page_alloc.c:2995 [inline]
BUG: KMSAN: uninit-value in get_page_from_freelist+0x5f30/0xb7b0 mm/page_alloc.c:3354
CPU: 1 PID: 7057 Comm: syz-executor988 Not tainted 4.17.0+ #17
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:1368
 __msan_warning_32+0x70/0xc0 mm/kmsan/kmsan_instr.c:634
 __rmqueue_pcplist mm/page_alloc.c:2944 [inline]
 rmqueue_pcplist mm/page_alloc.c:2973 [inline]
 rmqueue mm/page_alloc.c:2995 [inline]
 get_page_from_freelist+0x5f30/0xb7b0 mm/page_alloc.c:3354
 __alloc_pages_nodemask+0x792/0x5cc0 mm/page_alloc.c:4373
 alloc_pages_current+0x6b1/0x970 mm/mempolicy.c:2093
 alloc_pages include/linux/gfp.h:494 [inline]
 pte_alloc_one+0x56/0x100 arch/x86/mm/pgtable.c:30
 __do_huge_pmd_anonymous_page mm/huge_memory.c:564 [inline]
 do_huge_pmd_anonymous_page+0xefa/0x2540 mm/huge_memory.c:728
 create_huge_pmd mm/memory.c:3856 [inline]
 __handle_mm_fault mm/memory.c:4060 [inline]
 handle_mm_fault+0x44ca/0x7ed0 mm/memory.c:4126
 __do_page_fault+0xec6/0x1a10 arch/x86/mm/fault.c:1400
 do_page_fault+0xb7/0x250 arch/x86/mm/fault.c:1477
 page_fault+0x1e/0x30 arch/x86/entry/entry_64.S:1167
RIP: 0033:0x400de7
RSP: 002b:00007ff1df807cf0 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 00000000006dcc24 RCX: 0000000000446db9
RDX: 8f4bc609fc316862 RSI: 0000000000000000 RDI: 00007ff1df808608
RBP: 00000000006dcc20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffd2a54143f R14: 00007ff1df8089c0 R15: 0000000000000003

Uninit was stored to memory at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:287 [inline]
 kmsan_save_stack mm/kmsan/kmsan.c:302 [inline]
 kmsan_internal_chain_origin+0x12b/0x210 mm/kmsan/kmsan.c:692
 __msan_chain_origin+0x69/0xc0 mm/kmsan/kmsan_instr.c:478
 __write_once_size include/linux/compiler.h:224 [inline]
 __list_add include/linux/list.h:66 [inline]
 list_add include/linux/list.h:79 [inline]
 free_unref_page_commit+0x4bc/0x4d0 mm/page_alloc.c:2776
 free_unref_page mm/page_alloc.c:2796 [inline]
 __free_pages mm/page_alloc.c:4442 [inline]
 free_pages+0x290/0x320 mm/page_alloc.c:4454
 arch_tlb_finish_mmu mm/memory.c:291 [inline]
 tlb_finish_mmu+0x3f7/0x5c0 mm/memory.c:434
 exit_mmap+0x539/0x980 mm/mmap.c:3107
 __mmput+0x158/0x600 kernel/fork.c:962
 mmput+0xab/0xf0 kernel/fork.c:983
 exit_mm+0x6ed/0x7a0 kernel/exit.c:545
 do_exit+0xc12/0x3930 kernel/exit.c:854
 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+0x63/0xe7

Local variable description: ----tlb@exit_mmap
Variable was created at:
 exit_mmap+0x47/0x980 mm/mmap.c:3051
 __mmput+0x158/0x600 kernel/fork.c:962
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