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Date:   Sat, 09 May 2020 00:20:14 -0700
From:   syzbot <>
Subject: WARNING in memtype_reserve


syzbot found the following crash on:

HEAD commit:    d5eeab8d Merge tag 'scsi-fixes' of git://
git tree:       upstream
console output:
kernel config:
dashboard link:
compiler:       gcc (GCC) 9.0.0 20181231 (experimental)
userspace arch: i386
syz repro:
C reproducer:

The bug was bisected to:

commit 2bef9aed6f0e22391c8d4570749b1acc9bc3981e
Author: Jeremy Linton <>
Date:   Mon May 4 20:13:48 2020 +0000

    usb: usbfs: correct kernel->user page attribute mismatch

bisection log:
final crash:
console output:

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Fixes: 2bef9aed6f0e ("usb: usbfs: correct kernel->user page attribute mismatch")

------------[ cut here ]------------
memtype_reserve failed: [mem 0xffffffffff000-0x00008fff], req write-back
WARNING: CPU: 1 PID: 7025 at arch/x86/mm/pat/memtype.c:589 memtype_reserve+0x69f/0x820 arch/x86/mm/pat/memtype.c:589
Kernel panic - not syncing: panic_on_warn set ...
CPU: 1 PID: 7025 Comm: syz-executor254 Not tainted 5.7.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x188/0x20d lib/dump_stack.c:118
 panic+0x2e3/0x75c kernel/panic.c:221
 __warn.cold+0x2f/0x35 kernel/panic.c:582
 report_bug+0x27b/0x2f0 lib/bug.c:195
 fixup_bug arch/x86/kernel/traps.c:175 [inline]
 fixup_bug arch/x86/kernel/traps.c:170 [inline]
 do_error_trap+0x12b/0x220 arch/x86/kernel/traps.c:267
 do_invalid_op+0x32/0x40 arch/x86/kernel/traps.c:286
 invalid_op+0x23/0x30 arch/x86/entry/entry_64.S:1027
RIP: 0010:memtype_reserve+0x69f/0x820 arch/x86/mm/pat/memtype.c:589
Code: 48 8b 2c ed c0 00 29 88 e8 ae ad 3e 00 48 8d 4b ff 49 89 e8 4c 89 e2 48 c7 c6 20 01 29 88 48 c7 c7 80 f9 28 88 e8 79 e8 0f 00 <0f> 0b 41 bf ea ff ff ff e9 03 fc ff ff 41 bf ea ff ff ff e9 f8 fb
RSP: 0018:ffffc900015e7790 EFLAGS: 00010282
RAX: 0000000000000000 RBX: 0000000000009000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff815ce181 RDI: fffff520002bcee4
RBP: ffffffff8828ff40 R08: ffff888097ce85c0 R09: ffffed1015ce45f1
R10: ffff8880ae722f83 R11: ffffed1015ce45f0 R12: 000ffffffffff000
R13: 1ffff920002bcef8 R14: dffffc0000000000 R15: 0000000000000000
 reserve_pfn_range+0x173/0x470 arch/x86/mm/pat/memtype.c:941
 track_pfn_remap+0x18b/0x280 arch/x86/mm/pat/memtype.c:1033
 remap_pfn_range+0x202/0xbf0 mm/memory.c:2130
 dma_direct_mmap+0x197/0x260 kernel/dma/direct.c:453
 dma_mmap_attrs+0xfe/0x150 kernel/dma/mapping.c:237
 usbdev_mmap+0x3ae/0x730 drivers/usb/core/devio.c:254
 call_mmap include/linux/fs.h:1912 [inline]
 mmap_region+0xafb/0x1540 mm/mmap.c:1772
 do_mmap+0x849/0x1160 mm/mmap.c:1545
 do_mmap_pgoff include/linux/mm.h:2553 [inline]
 vm_mmap_pgoff+0x197/0x200 mm/util.c:506
 ksys_mmap_pgoff+0x457/0x5b0 mm/mmap.c:1595
 do_syscall_32_irqs_on arch/x86/entry/common.c:337 [inline]
 do_fast_syscall_32+0x270/0xe90 arch/x86/entry/common.c:396
 entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139
Kernel Offset: disabled
Rebooting in 86400 seconds..

This bug is generated by a bot. It may contain errors.
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syzbot will keep track of this bug report. See: for how to communicate with syzbot.
For information about bisection process see:
syzbot can test patches for this bug, for details see:

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