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    Subject[syzbot] kernel BUG in __tlb_remove_page_size
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    Hello,

    syzbot found the following issue on:

    HEAD commit: 3dbdb38e Merge branch 'for-5.14' of git://git.kernel.org/p..
    git tree: upstream
    console output: https://syzkaller.appspot.com/x/log.txt?x=1216c149d00000
    kernel config: https://syzkaller.appspot.com/x/.config?x=a1fcf15a09815757
    dashboard link: https://syzkaller.appspot.com/bug?extid=2f816ba9b71ca9a8e6b0
    userspace arch: i386
    syz repro: https://syzkaller.appspot.com/x/repro.syz?x=151ee572300000

    IMPORTANT: if you fix the issue, please add the following tag to the commit:
    Reported-by: syzbot+2f816ba9b71ca9a8e6b0@syzkaller.appspotmail.com

    release_pages+0x856/0x20a0 mm/swap.c:972
    tlb_batch_pages_flush mm/mmu_gather.c:49 [inline]
    tlb_flush_mmu_free mm/mmu_gather.c:242 [inline]
    tlb_flush_mmu mm/mmu_gather.c:249 [inline]
    tlb_finish_mmu+0x165/0x8c0 mm/mmu_gather.c:340
    exit_mmap+0x1ea/0x620 mm/mmap.c:3204
    __mmput+0x122/0x470 kernel/fork.c:1101
    mmput+0x58/0x60 kernel/fork.c:1122
    exit_mm kernel/exit.c:501 [inline]
    do_exit+0xae2/0x2a50 kernel/exit.c:812
    do_group_exit+0x125/0x310 kernel/exit.c:922
    __do_sys_exit_group kernel/exit.c:933 [inline]
    __se_sys_exit_group kernel/exit.c:931 [inline]
    __x64_sys_exit_group+0x3a/0x50 kernel/exit.c:931
    do_syscall_x64 arch/x86/entry/common.c:50 [inline]
    do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
    entry_SYSCALL_64_after_hwframe+0x44/0xae
    ------------[ cut here ]------------
    kernel BUG at mm/mmu_gather.c:87!
    invalid opcode: 0000 [#1] PREEMPT SMP KASAN
    CPU: 1 PID: 10208 Comm: syz-executor.4 Not tainted 5.13.0-syzkaller #0
    Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
    RIP: 0010:__tlb_remove_page_size+0x1f1/0x420 mm/mmu_gather.c:87
    Code: d2 0f 85 ef 01 00 00 8b 6d 0c e9 34 ff ff ff e8 65 0d c8 ff 0f 0b e8 5e 0d c8 ff 48 c7 c6 60 93 96 89 4c 89 f7 e8 9f ce fa ff <0f> 0b e8 48 0d c8 ff 4c 8d 6b 24 48 b8 00 00 00 00 00 fc ff df 4c
    RSP: 0018:ffffc90002757748 EFLAGS: 00010293
    RAX: 0000000000000000 RBX: ffffc90002757a60 RCX: 0000000000000000
    RDX: ffff888032eeb880 RSI: ffffffff81ad7ce1 RDI: 0000000000000003
    RBP: 0000000000000000 R08: 0000000000000029 R09: 00000000ffffffff
    R10: ffffffff88e1c1e9 R11: 00000000ffffffff R12: 0000000000000000
    R13: 0000000000000001 R14: ffffea0000d09e00 R15: ffffc90002757a88
    FS: 0000000000000000(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
    CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033
    CR2: 000000000ab8a404 CR3: 000000003792f000 CR4: 00000000001506e0
    DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
    DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
    Call Trace:
    __tlb_remove_page include/asm-generic/tlb.h:440 [inline]
    zap_pte_range mm/memory.c:1272 [inline]
    zap_pmd_range mm/memory.c:1384 [inline]
    zap_pud_range mm/memory.c:1413 [inline]
    zap_p4d_range mm/memory.c:1434 [inline]
    unmap_page_range+0xf22/0x2890 mm/memory.c:1455
    unmap_single_vma+0x198/0x300 mm/memory.c:1500
    unmap_vmas+0x16d/0x2f0 mm/memory.c:1532
    exit_mmap+0x1d0/0x620 mm/mmap.c:3202
    __mmput+0x122/0x470 kernel/fork.c:1101
    mmput+0x58/0x60 kernel/fork.c:1122
    exit_mm kernel/exit.c:501 [inline]
    do_exit+0xae2/0x2a50 kernel/exit.c:812
    do_group_exit+0x125/0x310 kernel/exit.c:922
    get_signal+0x47f/0x2150 kernel/signal.c:2796
    arch_do_signal_or_restart+0x2a9/0x1eb0 arch/x86/kernel/signal.c:789
    handle_signal_work kernel/entry/common.c:148 [inline]
    exit_to_user_mode_loop kernel/entry/common.c:172 [inline]
    exit_to_user_mode_prepare+0x17d/0x290 kernel/entry/common.c:209
    __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline]
    syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:302
    __do_fast_syscall_32+0x72/0xf0 arch/x86/entry/common.c:181
    do_fast_syscall_32+0x2f/0x70 arch/x86/entry/common.c:203
    entry_SYSENTER_compat_after_hwframe+0x4d/0x5c
    RIP: 0023:0xf7ff1549
    Code: Unable to access opcode bytes at RIP 0xf7ff151f.
    RSP: 002b:00000000f77eb68c EFLAGS: 00000246 ORIG_RAX: 00000000000000f0
    RAX: 0000000000000001 RBX: 000000000819afcc RCX: 0000000000000081
    RDX: 00000000000f4240 RSI: 0000000000000000 RDI: 0000000000000000
    RBP: 00000000080525a9 R08: 0000000000000000 R09: 0000000000000000
    R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
    R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
    Modules linked in:
    ---[ end trace 67c535245c014435 ]---
    RIP: 0010:__tlb_remove_page_size+0x1f1/0x420 mm/mmu_gather.c:87
    Code: d2 0f 85 ef 01 00 00 8b 6d 0c e9 34 ff ff ff e8 65 0d c8 ff 0f 0b e8 5e 0d c8 ff 48 c7 c6 60 93 96 89 4c 89 f7 e8 9f ce fa ff <0f> 0b e8 48 0d c8 ff 4c 8d 6b 24 48 b8 00 00 00 00 00 fc ff df 4c
    RSP: 0018:ffffc90002757748 EFLAGS: 00010293
    RAX: 0000000000000000 RBX: ffffc90002757a60 RCX: 0000000000000000
    RDX: ffff888032eeb880 RSI: ffffffff81ad7ce1 RDI: 0000000000000003
    RBP: 0000000000000000 R08: 0000000000000029 R09: 00000000ffffffff
    R10: ffffffff88e1c1e9 R11: 00000000ffffffff R12: 0000000000000000
    R13: 0000000000000001 R14: ffffea0000d09e00 R15: ffffc90002757a88
    FS: 0000000000000000(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
    CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033
    CR2: 000000000ab8a404 CR3: 000000003792f000 CR4: 00000000001506e0
    DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
    DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400


    ---
    This report is generated by a bot. It may contain errors.
    See https://goo.gl/tpsmEJ for more information about syzbot.
    syzbot engineers can be reached at syzkaller@googlegroups.com.

    syzbot will keep track of this issue. See:
    https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
    syzbot can test patches for this issue, for details see:
    https://goo.gl/tpsmEJ#testing-patches

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