linux-kernel - kernel BUG at mm/huge

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Message-ID: <000000000000d7327005aecd52f4@google.com>
Date:   Tue, 08 Sep 2020 06:29:24 -0700
From:   syzbot <syzbot+2200e21ff920b6b08faa@...kaller.appspotmail.com>
To:     akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, syzkaller-bugs@...glegroups.com
Subject: kernel BUG at mm/huge_memory.c:LINE! (2)

Hello,

syzbot found the following issue on:

HEAD commit:    e28f0104 Merge tag 'fixes-2020-09-03' of git://git.kernel...
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=1252b7fe900000
kernel config:  https://syzkaller.appspot.com/x/.config?x=3c5f6ce8d5b68299
dashboard link: https://syzkaller.appspot.com/bug?extid=2200e21ff920b6b08faa
compiler:       gcc (GCC) 10.1.0-syz 20200507

Unfortunately, I don't have any reproducer for this issue yet.

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+2200e21ff920b6b08faa@...kaller.appspotmail.com

------------[ cut here ]------------
kernel BUG at mm/huge_memory.c:1654!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 25918 Comm: syz-executor.5 Not tainted 5.9.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:zap_huge_pmd+0x8cb/0xfa0 mm/huge_memory.c:1654
Code: 24 1c 0f 84 c9 03 00 00 e8 42 2a bd ff 8b 34 24 bf 1d 00 00 00 e8 b5 26 bd ff 48 83 3c 24 1d 0f 84 ac 03 00 00 e8 25 2a bd ff <0f> 0b e8 1e 2a bd ff 48 89 ea 48 b8 00 00 00 00 00 fc ff df 48 c1
RSP: 0018:ffffc90004ac7730 EFLAGS: 00010293
RAX: 0000000000000000 RBX: 0770000000000000 RCX: ffffffff81b720cb
RDX: ffff8880985c0200 RSI: ffffffff81b720db RDI: 0000000000000005
RBP: ffffc90004ac7a50 R08: 0000000000000001 R09: ffff888000183827
R10: 000000000000001d R11: 0000000000000000 R12: ffff888000183820
R13: ffff88804d29b900 R14: ffffffff89b63d70 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000016a3b73 CR3: 000000009b476000 CR4: 00000000001506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 zap_pmd_range mm/memory.c:1182 [inline]
 zap_pud_range mm/memory.c:1224 [inline]
 zap_p4d_range mm/memory.c:1245 [inline]
 unmap_page_range+0x107b/0x2b20 mm/memory.c:1266
 unmap_single_vma+0x198/0x300 mm/memory.c:1311
 unmap_vmas+0x168/0x2e0 mm/memory.c:1343
 exit_mmap+0x2b1/0x530 mm/mmap.c:3183
 __mmput+0x122/0x470 kernel/fork.c:1076
 mmput+0x53/0x60 kernel/fork.c:1097
 exit_mm kernel/exit.c:483 [inline]
 do_exit+0xa8b/0x29f0 kernel/exit.c:793
 do_group_exit+0x125/0x310 kernel/exit.c:903
 get_signal+0x428/0x1f00 kernel/signal.c:2757
 arch_do_signal+0x82/0x2520 arch/x86/kernel/signal.c:811
 exit_to_user_mode_loop kernel/entry/common.c:136 [inline]
 exit_to_user_mode_prepare+0x1ae/0x200 kernel/entry/common.c:167
 syscall_exit_to_user_mode+0x7e/0x2e0 kernel/entry/common.c:242
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45d5b9
Code: Bad RIP value.
RSP: 002b:00007f290f37fcf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: 0000000000000001 RBX: 000000000118cfe8 RCX: 000000000045d5b9
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 000000000118cfec
RBP: 000000000118cfe0 R08: 000000000000000e R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118cfec
R13: 00007ffc935c909f R14: 00007f290f3809c0 R15: 000000000118cfec
Modules linked in:
---[ end trace 9c85984f4836a6e7 ]---
RIP: 0010:zap_huge_pmd+0x8cb/0xfa0 mm/huge_memory.c:1654
Code: 24 1c 0f 84 c9 03 00 00 e8 42 2a bd ff 8b 34 24 bf 1d 00 00 00 e8 b5 26 bd ff 48 83 3c 24 1d 0f 84 ac 03 00 00 e8 25 2a bd ff <0f> 0b e8 1e 2a bd ff 48 89 ea 48 b8 00 00 00 00 00 fc ff df 48 c1
RSP: 0018:ffffc90004ac7730 EFLAGS: 00010293
RAX: 0000000000000000 RBX: 0770000000000000 RCX: ffffffff81b720cb
RDX: ffff8880985c0200 RSI: ffffffff81b720db RDI: 0000000000000005
RBP: ffffc90004ac7a50 R08: 0000000000000001 R09: ffff888000183827
R10: 000000000000001d R11: 0000000000000000 R12: ffff888000183820
R13: ffff88804d29b900 R14: ffffffff89b63d70 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000016a3b73 CR3: 000000009b476000 CR4: 00000000001506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400


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