linux-kernel - BUG: unable to handle kernel paging request in free_swap

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Date:   Thu, 10 Sep 2020 05:55:21 -0700
From:   syzbot <syzbot+b41193cb6e40673119c1@...kaller.appspotmail.com>
To:     akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, syzkaller-bugs@...glegroups.com
Subject: BUG: unable to handle kernel paging request in free_swap_cache

Hello,

syzbot found the following issue on:

HEAD commit:    dd9fb9bb Merge tags 'auxdisplay-for-linus-v5.9-rc4', 'clan..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=164e35cd900000
kernel config:  https://syzkaller.appspot.com/x/.config?x=bd46548257448703
dashboard link: https://syzkaller.appspot.com/bug?extid=b41193cb6e40673119c1
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+b41193cb6e40673119c1@...kaller.appspotmail.com

BUG: unable to handle page fault for address: ffffea007777777f
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD 12fff8067 P4D 12fff8067 PUD 0 
Oops: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 10690 Comm: syz-executor.2 Not tainted 5.9.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:compound_head include/linux/page-flags.h:182 [inline]
RIP: 0010:PageSwapCache include/linux/page-flags.h:391 [inline]
RIP: 0010:free_swap_cache+0x32/0x300 mm/swap_state.c:325
Code: 49 89 fc 55 4d 8d 6c 24 08 53 e8 49 10 c7 ff 4c 89 ea 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 80 3c 02 00 0f 85 85 02 00 00 <4d> 8b 74 24 08 31 ff 4c 89 e5 4c 89 f3 83 e3 01 48 89 de e8 b6 0c
RSP: 0018:ffffc900088a76d0 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: ffff888000143848 RCX: ffffffff81ad73c2
RDX: 1ffffd400eeeeeef RSI: ffffffff81ad3ab7 RDI: ffffea0077777777
RBP: 0000000000000107 R08: 0000000000000000 R09: ffffea00018ec9c7
R10: 00000000000001fe R11: 0000000000000000 R12: ffffea0077777777
R13: ffffea007777777f R14: dffffc0000000000 R15: ffffc900088a7a80
FS:  0000000000000000(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffea007777777f CR3: 0000000214b08000 CR4: 00000000001526e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 free_pages_and_swap_cache+0x58/0x90 mm/swap_state.c:353
 tlb_batch_pages_flush mm/mmu_gather.c:49 [inline]
 tlb_flush_mmu_free mm/mmu_gather.c:242 [inline]
 tlb_flush_mmu+0xe9/0x6b0 mm/mmu_gather.c:249
 zap_pte_range mm/memory.c:1159 [inline]
 zap_pmd_range mm/memory.c:1197 [inline]
 zap_pud_range mm/memory.c:1226 [inline]
 zap_p4d_range mm/memory.c:1247 [inline]
 unmap_page_range+0x1e22/0x2b20 mm/memory.c:1268
 unmap_single_vma+0x198/0x300 mm/memory.c:1313
 unmap_vmas+0x168/0x2e0 mm/memory.c:1345
 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:00007f77c0d90cf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: 0000000000000001 RBX: 000000000118cf48 RCX: 000000000045d5b9
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 000000000118cf4c
RBP: 000000000118cf40 R08: 000000000000000e R09: 0000000000000000
R10: 0000000000000003 R11: 0000000000000246 R12: 000000000118cf4c
R13: 000000000169fb6f R14: 00007f77c0d919c0 R15: 000000000118cf4c
Modules linked in:
CR2: ffffea007777777f
---[ end trace 07566fd2f7a76eaf ]---
RIP: 0010:compound_head include/linux/page-flags.h:182 [inline]
RIP: 0010:PageSwapCache include/linux/page-flags.h:391 [inline]
RIP: 0010:free_swap_cache+0x32/0x300 mm/swap_state.c:325
Code: 49 89 fc 55 4d 8d 6c 24 08 53 e8 49 10 c7 ff 4c 89 ea 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 80 3c 02 00 0f 85 85 02 00 00 <4d> 8b 74 24 08 31 ff 4c 89 e5 4c 89 f3 83 e3 01 48 89 de e8 b6 0c
RSP: 0018:ffffc900088a76d0 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: ffff888000143848 RCX: ffffffff81ad73c2
RDX: 1ffffd400eeeeeef RSI: ffffffff81ad3ab7 RDI: ffffea0077777777
RBP: 0000000000000107 R08: 0000000000000000 R09: ffffea00018ec9c7
R10: 00000000000001fe R11: 0000000000000000 R12: ffffea0077777777
R13: ffffea007777777f R14: dffffc0000000000 R15: ffffc900088a7a80
FS:  0000000000000000(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffea007777777f CR3: 0000000214b08000 CR4: 00000000001526e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400


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