Message-ID: <000000000000af1b3b05ab9b51c2@google.com>
Date:   Wed, 29 Jul 2020 14:34:22 -0700
From:   syzbot <syzbot+dfb45ba0aafa4329fd19@...kaller.appspotmail.com>
To:     linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        syzkaller-bugs@...glegroups.com, viro@...iv.linux.org.uk
Subject: kernel BUG at arch/x86/mm/physaddr.c:LINE! (6)

Hello,

syzbot found the following issue on:

HEAD commit:    23ee3e4e Merge tag 'pci-v5.8-fixes-2' of git://git.kernel...
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=16c45f78900000
kernel config:  https://syzkaller.appspot.com/x/.config?x=f87a5e4232fdb267
dashboard link: https://syzkaller.appspot.com/bug?extid=dfb45ba0aafa4329fd19
compiler:       gcc (GCC) 10.1.0-syz 20200507
userspace arch: i386

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+dfb45ba0aafa4329fd19@...kaller.appspotmail.com

------------[ cut here ]------------
kernel BUG at arch/x86/mm/physaddr.c:28!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 15249 Comm: syz-executor.4 Not tainted 5.8.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:__phys_addr+0xa7/0x110 arch/x86/mm/physaddr.c:28
Code: 61 7a 09 4c 89 e3 31 ff 48 d3 eb 48 89 de e8 90 60 3f 00 48 85 db 75 0d e8 e6 63 3f 00 4c 89 e0 5b 5d 41 5c c3 e8 d9 63 3f 00 <0f> 0b e8 d2 63 3f 00 48 c7 c0 10 10 a8 89 48 ba 00 00 00 00 00 fc
RSP: 0018:ffffc90015be7c18 EFLAGS: 00010216
RAX: 0000000000003629 RBX: 0000000000077000 RCX: ffffc900116ea000
RDX: 0000000000040000 RSI: ffffffff813458b7 RDI: 0000000000000006
RBP: 0000000080077000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000080077000 R11: 0000000000000000 R12: 0000778000077000
R13: ffffc90015be7c70 R14: 0000000000000000 R15: 0000000000000286
FS:  0000000000000000(0000) GS:ffff8880ae700000(0063) knlGS:00000000f5db6b40
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 000055bcdd3fe588 CR3: 0000000070105000 CR4: 00000000001426e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 virt_to_head_page include/linux/mm.h:841 [inline]
 qlink_to_cache mm/kasan/quarantine.c:128 [inline]
 qlist_free_all+0xbb/0x140 mm/kasan/quarantine.c:164
 quarantine_reduce+0x17e/0x200 mm/kasan/quarantine.c:260
 __kasan_kmalloc.constprop.0+0x9e/0xd0 mm/kasan/common.c:475
 slab_post_alloc_hook mm/slab.h:586 [inline]
 slab_alloc mm/slab.c:3320 [inline]
 kmem_cache_alloc+0x12c/0x3b0 mm/slab.c:3484
 __d_alloc+0x2a/0x920 fs/dcache.c:1709
 d_alloc_pseudo+0x19/0x70 fs/dcache.c:1838
 alloc_file_pseudo+0xc6/0x250 fs/file_table.c:226
 sock_alloc_file+0x4f/0x190 net/socket.c:411
 sock_map_fd net/socket.c:435 [inline]
 __sys_socket+0x13d/0x200 net/socket.c:1525
 __do_sys_socket net/socket.c:1530 [inline]
 __se_sys_socket net/socket.c:1528 [inline]
 __ia32_sys_socket+0x6f/0xb0 net/socket.c:1528
 do_syscall_32_irqs_on+0x3f/0x60 arch/x86/entry/common.c:428
 __do_fast_syscall_32 arch/x86/entry/common.c:475 [inline]
 do_fast_syscall_32+0x7f/0x120 arch/x86/entry/common.c:503
 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c
RIP: 0023:0xf7fbb569
Code: Bad RIP value.
RSP: 002b:00000000f5db60cc EFLAGS: 00000296 ORIG_RAX: 0000000000000167
RAX: ffffffffffffffda RBX: 000000000000000a RCX: 0000000000000001
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
Modules linked in:


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