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From: syzbot <syzbot+c48f34012b06c4ac67dd@syzkaller.appspotmail.com>
To: Markus.Elfring@web.de, akpm@linux-foundation.org,
	axboe@kernel.dk,  david@redhat.com, hannes@cmpxchg.org,
	hdanton@sina.com,  jennifer@dakotaviewrealty.com,
	kirill.shutemov@linux.intel.com,  kirill@shutemov.name,
	linux-kernel@vger.kernel.org, linux-mm@kvack.org,
	 mike.kravetz@oracle.com, rcampbell@nvidia.com,
	 syzkaller-bugs@googlegroups.com, willy@infradead.org
Subject: Re: [syzbot] kernel BUG at include/linux/swapops.h:LINE!
Date: Sat, 08 May 2021 04:24:22 -0700	[thread overview]
Message-ID: <00000000000045ff9505c1cfc9ae@google.com> (raw)
In-Reply-To: <000000000000bc4fd705a6e090e2@google.com>

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@syzkaller.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



      parent reply	other threads:[~2021-05-08 11:24 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-05-30 17:05 kernel BUG at include/linux/swapops.h:LINE! syzbot
2020-07-19 21:10 ` syzbot
2020-07-20 23:51   ` Andrew Morton
2020-07-21  0:21     ` Matthew Wilcox
2020-07-21  2:14       ` Matthew Wilcox
2020-07-21 11:11     ` Kirill A. Shutemov
2020-07-21 15:11       ` Jens Axboe
2020-07-23  7:37       ` Hillf Danton
2020-07-24 11:13         ` Kirill A. Shutemov
2020-07-26 16:49           ` Matthew Wilcox
2020-07-27 10:31             ` Kirill A. Shutemov
2020-07-27 12:03               ` Matthew Wilcox
2020-07-27 12:59                 ` Hillf Danton
2020-07-27 13:44                   ` Matthew Wilcox
2020-07-27 14:46                     ` Hillf Danton
2020-07-29 19:21                 ` Kirill A. Shutemov
2020-07-29 19:54                   ` Matthew Wilcox
2020-07-29 22:11                     ` Matthew Wilcox
2021-05-08 11:24 ` syzbot [this message]

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