linux-kernel - Re: [syzbot] kernel BUG at include/linux/swapops.h:LINE!

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Date:   Sat, 08 May 2021 04:24:22 -0700
From:   syzbot <syzbot+c48f34012b06c4ac67dd@...kaller.appspotmail.com>
To:     Markus.Elfring@....de, akpm@...ux-foundation.org, axboe@...nel.dk,
        david@...hat.com, hannes@...xchg.org, hdanton@...a.com,
        jennifer@...otaviewrealty.com, kirill.shutemov@...ux.intel.com,
        kirill@...temov.name, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, mike.kravetz@...cle.com, rcampbell@...dia.com,
        syzkaller-bugs@...glegroups.com, willy@...radead.org
Subject: Re: [syzbot] kernel BUG at include/linux/swapops.h:LINE!

syzbot has found a reproducer for the following issue on:

HEAD commit:    869a85b9 Add linux-next specific files for 20210507
git tree:       linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=15b48a63d00000
kernel config:  https://syzkaller.appspot.com/x/.config?x=b72885037018d06d
dashboard link: https://syzkaller.appspot.com/bug?extid=c48f34012b06c4ac67dd
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=10479fd5d00000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=1565e995d00000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+c48f34012b06c4ac67dd@...kaller.appspotmail.com

------------[ cut here ]------------
kernel BUG at include/linux/swapops.h:197!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 8460 Comm: syz-executor246 Not tainted 5.12.0-next-20210507-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:migration_entry_to_page include/linux/swapops.h:197 [inline]
RIP: 0010:migration_entry_to_page include/linux/swapops.h:190 [inline]
RIP: 0010:zap_huge_pmd+0xe5b/0x1110 mm/huge_memory.c:1697
Code: 2b 3f b8 ff 48 8b 5c 24 10 48 83 eb 01 e9 a8 f6 ff ff e8 18 3f b8 ff 48 8b 5c 24 10 48 83 eb 01 e9 66 f7 ff ff e8 05 3f b8 ff <0f> 0b e8 fe 3e b8 ff 31 f6 31 ff 49 bc 00 f0 ff ff ff ff 0f 00 e8
RSP: 0018:ffffc90001a2f730 EFLAGS: 00010293
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: ffff888024bc5580 RSI: ffffffff81bc972b RDI: 0000000000000003
RBP: ffffc90001a2fa48 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffff81bc8ec8 R11: 0000000000000000 R12: ffff88802c9a5800
R13: ffffea0000e58080 R14: ffff8880303bfea0 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000004c8168 CR3: 0000000016b36000 CR4: 00000000001506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 zap_pmd_range mm/memory.c:1361 [inline]
 zap_pud_range mm/memory.c:1403 [inline]
 zap_p4d_range mm/memory.c:1424 [inline]
 unmap_page_range+0x1aa4/0x2650 mm/memory.c:1445
 unmap_single_vma+0x198/0x300 mm/memory.c:1490
 unmap_vmas+0x16d/0x2f0 mm/memory.c:1522
 exit_mmap+0x2a8/0x590 mm/mmap.c:3207
 __mmput+0x122/0x470 kernel/fork.c:1096
 mmput+0x58/0x60 kernel/fork.c:1117
 exit_mm kernel/exit.c:502 [inline]
 do_exit+0xb0a/0x2a60 kernel/exit.c:813
 do_group_exit+0x125/0x310 kernel/exit.c:923
 get_signal+0x47f/0x2150 kernel/signal.c:2856
 arch_do_signal_or_restart+0x2a8/0x1eb0 arch/x86/kernel/signal.c:789
 handle_signal_work kernel/entry/common.c:147 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:171 [inline]
 exit_to_user_mode_prepare+0x171/0x280 kernel/entry/common.c:208
 __syscall_exit_to_user_mode_work kernel/entry/common.c:290 [inline]
 syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:301
 do_syscall_64+0x47/0xb0 arch/x86/entry/common.c:57
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x4458f9
Code: Unable to access opcode bytes at RIP 0x4458cf.
RSP: 002b:00007f45f24e4318 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00000000004ca408 RCX: 00000000004458f9
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00000000004ca408
RBP: 00000000004ca400 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000001000000020
R13: 00007ffeb676771f R14: 00007f45f24e4400 R15: 0000000000022000
Modules linked in:
---[ end trace 8c9f5c48deec1bb7 ]---
RIP: 0010:migration_entry_to_page include/linux/swapops.h:197 [inline]
RIP: 0010:migration_entry_to_page include/linux/swapops.h:190 [inline]
RIP: 0010:zap_huge_pmd+0xe5b/0x1110 mm/huge_memory.c:1697
Code: 2b 3f b8 ff 48 8b 5c 24 10 48 83 eb 01 e9 a8 f6 ff ff e8 18 3f b8 ff 48 8b 5c 24 10 48 83 eb 01 e9 66 f7 ff ff e8 05 3f b8 ff <0f> 0b e8 fe 3e b8 ff 31 f6 31 ff 49 bc 00 f0 ff ff ff ff 0f 00 e8
RSP: 0018:ffffc90001a2f730 EFLAGS: 00010293
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: ffff888024bc5580 RSI: ffffffff81bc972b RDI: 0000000000000003
RBP: ffffc90001a2fa48 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffff81bc8ec8 R11: 0000000000000000 R12: ffff88802c9a5800
R13: ffffea0000e58080 R14: ffff8880303bfea0 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000004c8168 CR3: 000000000bc8e000 CR4: 00000000001506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400