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Subjectgeneral protection fault in create_empty_buffers (3)
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Hello,

syzbot found the following crash on:

HEAD commit: 4e99b321 Merge tag 'nfs-for-5.8-2' of git://git.linux-nfs...
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=14355b4b100000
kernel config: https://syzkaller.appspot.com/x/.config?x=bf3aec367b9ab569
dashboard link: https://syzkaller.appspot.com/bug?extid=66017672f8ea3c492d56
compiler: gcc (GCC) 10.1.0-syz 20200507

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

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+66017672f8ea3c492d56@syzkaller.appspotmail.com

general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
CPU: 0 PID: 3911 Comm: systemd-udevd Not tainted 5.8.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:create_empty_buffers+0x4f/0x820 fs/buffer.c:1565
Code: 89 ef e8 94 9a ff ff 49 bc 00 00 00 00 00 fc ff df 48 89 44 24 08 48 89 c3 eb 03 48 89 c3 e8 78 9c a6 ff 48 89 d8 48 c1 e8 03 <42> 80 3c 20 00 0f 85 a8 06 00 00 4c 09 2b 48 8d 7b 08 48 89 f8 48
RSP: 0018:ffffc90001577858 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff81cc51b9
RDX: ffff8880a0d5c580 RSI: ffffffff81ccb478 RDI: 0000000000000005
RBP: ffffea00027d2dc0 R08: 0000000000000001 R09: ffff8880a0d5ce48
R10: 0000000000000000 R11: 0000000000000000 R12: dffffc0000000000
R13: 0000000000000000 R14: 0000000000000000 R15: dead000000000100
FS: 00007fbeb87098c0(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000400200 CR3: 00000000a03ad000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
create_page_buffers+0x295/0x3b0 fs/buffer.c:1679
block_read_full_page+0xcf/0xed0 fs/buffer.c:2269
do_read_cache_page+0x8d4/0x1390 mm/filemap.c:2765
read_mapping_page include/linux/pagemap.h:437 [inline]
read_part_sector+0xf6/0x5af block/partitions/core.c:772
adfspart_check_ICS+0x9d/0xc90 block/partitions/acorn.c:360
check_partition block/partitions/core.c:140 [inline]
blk_add_partitions+0x44b/0xe10 block/partitions/core.c:700
bdev_disk_changed+0x1ea/0x370 fs/block_dev.c:1524
blkdev_reread_part block/ioctl.c:103 [inline]
blkdev_common_ioctl+0x13d1/0x1760 block/ioctl.c:549
blkdev_ioctl+0x1a3/0x6c0 block/ioctl.c:618
block_ioctl+0xf9/0x140 fs/block_dev.c:1988
vfs_ioctl fs/ioctl.c:48 [inline]
ksys_ioctl+0x11a/0x180 fs/ioctl.c:753
__do_sys_ioctl fs/ioctl.c:762 [inline]
__se_sys_ioctl fs/ioctl.c:760 [inline]
__x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:760
do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:359
entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x7fbeb7582017
Code: Bad RIP value.
RSP: 002b:00007fff18b4d7e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fff18b4d960 RCX: 00007fbeb7582017
RDX: 0000000000000000 RSI: 000000000000125f RDI: 000000000000000e
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000010
R10: 0000000000000020 R11: 0000000000000246 R12: 00007fff18b4d990
R13: 000055f766174010 R14: 000055f767066210 R15: 00007fff18b4d860
Modules linked in:
---[ end trace 3a62581c64dab56e ]---
RIP: 0010:create_empty_buffers+0x4f/0x820 fs/buffer.c:1565
Code: 89 ef e8 94 9a ff ff 49 bc 00 00 00 00 00 fc ff df 48 89 44 24 08 48 89 c3 eb 03 48 89 c3 e8 78 9c a6 ff 48 89 d8 48 c1 e8 03 <42> 80 3c 20 00 0f 85 a8 06 00 00 4c 09 2b 48 8d 7b 08 48 89 f8 48
RSP: 0018:ffffc90001577858 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff81cc51b9
RDX: ffff8880a0d5c580 RSI: ffffffff81ccb478 RDI: 0000000000000005
RBP: ffffea00027d2dc0 R08: 0000000000000001 R09: ffff8880a0d5ce48
R10: 0000000000000000 R11: 0000000000000000 R12: dffffc0000000000
R13: 0000000000000000 R14: 0000000000000000 R15: dead000000000100
FS: 00007fbeb87098c0(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b32f2d000 CR3: 00000000a03ad000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400


---
This bug is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzkaller@googlegroups.com.

syzbot will keep track of this bug report. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.

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