BUG: sleeping function called from invalid context at arch/x86/mm/fault.c:LINE (2)

[syzbot]

Hello,

syzbot hit the following crash on upstream commit
c18bb396d3d261ebbb4efbc05129c5d354c541e4 (Tue Apr 10 00:04:10 2018 +0000)
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
syzbot dashboard link:
https://syzkaller.appspot.com/bug?extid=4af447792df4648be93b

syzkaller reproducer:
https://syzkaller.appspot.com/x/repro.syz?id=4934545564499968
Raw console output:
https://syzkaller.appspot.com/x/log.txt?id=6277896712749056
Kernel config:
https://syzkaller.appspot.com/x/.config?id=-1223000601505858474
compiler: gcc (GCC) 8.0.1 20180301 (experimental)

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+4af447...@syzkaller.appspotmail.com
It will help syzbot understand when the bug is fixed. See footer for
details.
If you forward the report, please keep this part and the footer.

IPVS: ftp: loaded support on port[0] = 21
IPVS: ftp: loaded support on port[0] = 21
IPVS: ftp: loaded support on port[0] = 21
IPVS: ftp: loaded support on port[0] = 21
IPVS: ftp: loaded support on port[0] = 21
BUG: sleeping function called from invalid context at
arch/x86/mm/fault.c:1342
in_atomic(): 0, irqs_disabled(): 1, pid: 4512, name: blkid
1 lock held by blkid/4512:
#0: 00000000d5b4e650 (&mm->mmap_sem){++++}, at:
__do_page_fault+0x381/0xe40 arch/x86/mm/fault.c:1328
irq event stamp: 1812
hardirqs last enabled at (1811): [<ffffffff87600096>]
entry_SYSCALL_64_after_hwframe+0x52/0xb7
hardirqs last disabled at (1812): [<ffffffff87601402>]
error_entry+0x72/0xd0 arch/x86/entry/entry_64.S:1261
softirqs last enabled at (1804): [<ffffffff87800778>]
__do_softirq+0x778/0xaf5 kernel/softirq.c:311
softirqs last disabled at (1797): [<ffffffff8146dd91>] invoke_softirq
kernel/softirq.c:365 [inline]
softirqs last disabled at (1797): [<ffffffff8146dd91>] irq_exit+0x1d1/0x200
kernel/softirq.c:405
CPU: 1 PID: 4512 Comm: blkid Not tainted 4.16.0+ #16
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
Call Trace:
BUG: unable to handle kernel paging request at 0000000041b5e1f3
PGD 1b4390067 P4D 1b4390067 PUD 0
Oops: 0000 [#1] SMP KASAN
Dumping ftrace buffer:
(ftrace buffer empty)
Modules linked in:
CPU: 1 PID: 4512 Comm: blkid Tainted: G W 4.16.0+ #16
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
RIP: 0010:msr_write_intercepted arch/x86/kvm/vmx.c:2126 [inline]
RIP: 0010:vmx_vcpu_run+0xa3d/0x25f0 arch/x86/kvm/vmx.c:9884
RSP: 0018:ffff8801b5d27380 EFLAGS: 00010046
==================================================================
BUG: KASAN: stack-out-of-bounds in __show_regs.cold.7+0x4e/0x54a
arch/x86/kernel/process_64.c:79
Read of size 8 at addr ffff8801b5d27300 by task blkid/4512

CPU: 1 PID: 4512 Comm: blkid Tainted: G W 4.16.0+ #16
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
Call Trace:

The buggy address belongs to the page:
page:ffffea0006d749c0 count:0 mapcount:0 mapping:0000000000000000 index:0x0
flags: 0x2fffc0000000000()
raw: 02fffc0000000000 0000000000000000 0000000000000000 00000000ffffffff
raw: 0000000000000000 ffffea0006d70101 0000000000000000 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
ffff8801b5d27200: f2 f2 f2 f2 00 f2 f2 f2 f2 f2 f2 f2 00 f2 f2 f2
ffff8801b5d27280: f3 f3 f3 f3 f2 f2 f8 f2 f2 f2 f2 f2 f2 f2 00 00
> ffff8801b5d27300: f2 f2 f3 f3 f3 f3 00 00 00 00 00 00 00 00 00 00
^
ffff8801b5d27380: f1 f1 f1 f1 00 f2 f2 f2 f2 f2 f2 f2 00 f2 f2 f2
ffff8801b5d27400: f2 f2 f2 f2 00 f2 f2 f2 f3 f3 f3 f3 00 00 00 00
==================================================================


---
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[syzbot]

syzbot has found reproducer for the following crash on upstream commit
b284d4d5a6785f8cd07eda2646a95782373cd01e (Tue Apr 10 19:25:30 2018 +0000)
Merge tag 'ceph-for-4.17-rc1' of git://github.com/ceph/ceph-client

syzbot dashboard link:
https://syzkaller.appspot.com/bug?extid=4af447792df4648be93b

So far this crash happened 2 times on upstream.
C reproducer: https://syzkaller.appspot.com/x/repro.c?id=5277733517000704
syzkaller reproducer:
https://syzkaller.appspot.com/x/repro.syz?id=6134240995442688
Raw console output:
https://syzkaller.appspot.com/x/log.txt?id=6087714151596032

Kernel config:
https://syzkaller.appspot.com/x/.config?id=-1223000601505858474
compiler: gcc (GCC) 8.0.1 20180301 (experimental)

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+4af447...@syzkaller.appspotmail.com
It will help syzbot understand when the bug is fixed.

BUG: sleeping function called from invalid context at
arch/x86/mm/fault.c:1342

in_atomic(): 0, irqs_disabled(): 1, pid: 4492, name: syzkaller559833
1 lock held by syzkaller559833/4492:
#0: 00000000d3c337f7 (&mm->mmap_sem){++++}, at:
__do_page_fault+0x381/0xe40 arch/x86/mm/fault.c:1328
irq event stamp: 3862
hardirqs last enabled at (3861): [<ffffffff81b2720f>] slab_alloc
mm/slab.c:3385 [inline]
hardirqs last enabled at (3861): [<ffffffff81b2720f>]
kmem_cache_alloc+0x26f/0x760 mm/slab.c:3552
hardirqs last disabled at (3862): [<ffffffff87601402>]
error_entry+0x72/0xd0 arch/x86/entry/entry_64.S:1261
softirqs last enabled at (3800): [<ffffffff87800778>]
__do_softirq+0x778/0xaf5 kernel/softirq.c:311
softirqs last disabled at (3779): [<ffffffff81470db1>] invoke_softirq
kernel/softirq.c:365 [inline]
softirqs last disabled at (3779): [<ffffffff81470db1>] irq_exit+0x1d1/0x200
kernel/softirq.c:405
CPU: 0 PID: 4492 Comm: syzkaller559833 Not tainted 4.16.0+ #19

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+0x1b9/0x294 lib/dump_stack.c:113
___might_sleep.cold.88+0x11f/0x13a kernel/sched/core.c:6188
__might_sleep+0x95/0x190 kernel/sched/core.c:6141
__do_page_fault+0x3ae/0xe40 arch/x86/mm/fault.c:1342
do_page_fault+0xee/0x8a7 arch/x86/mm/fault.c:1474
page_fault+0x25/0x50 arch/x86/entry/entry_64.S:1159
RIP: 0010:vmx_vcpu_run+0x95f/0x25f0 arch/x86/kvm/vmx.c:9746
RSP: 0018:ffff8801d95b7368 EFLAGS: 00010002
RAX: 000000000000118c RBX: ffff8801d90076c0 RCX: 0000000000000282
RDX: 0000000000000000 RSI: 00000000000000fc RDI: 00000000014000c0
RBP: ffff8801d95b7c18 R08: 0000000000036f48 R09: ffffed003b200ed8
R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801d90076c0
R13: ffff8801dad80000 R14: 0000000000000000 R15: ffff8801d90076bf
kasan_slab_alloc+0x12/0x20 mm/kasan/kasan.c:490
slab_post_alloc_hook mm/slab.h:444 [inline]
slab_alloc mm/slab.c:3392 [inline]
kmem_cache_alloc+0x11b/0x760 mm/slab.c:3552
getname_flags+0xd0/0x5a0 fs/namei.c:140
getname+0x19/0x20 fs/namei.c:211
do_sys_open+0x38e/0x770 fs/open.c:1087
SYSC_openat fs/open.c:1120 [inline]
SyS_openat+0x30/0x40 fs/open.c:1114
do_syscall_64+0x29e/0x9d0 arch/x86/entry/common.c:287
entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x4487c9
RSP: 002b:00007f4fe57efda8 EFLAGS: 00000297 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00000000006dec44 RCX: 00000000004487c9
RDX: 0000000000000000 RSI: 00000000200001c0 RDI: ffffffffffffff9c
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000297 R12: 00000000006dec40
R13: 0030656c69662f2e R14: 6d766b2f7665642f R15: 000000000000000c
BUG: unable to handle kernel paging request at 000000000000590a
PGD 1d9ba4067 P4D 1d9ba4067 PUD 1d9b9a067 PMD 0
Oops: 0002 [#1] SMP KASAN

Dumping ftrace buffer:
(ftrace buffer empty)
Modules linked in:

CPU: 0 PID: 4492 Comm: syzkaller559833 Tainted: G W 4.16.0+
#19

Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011

RIP: 0010:vmx_vcpu_run+0x95f/0x25f0 arch/x86/kvm/vmx.c:9746
RSP: 0018:ffff8801d95b7368 EFLAGS: 00010002
RAX: 000000000000118c RBX: ffff8801d90076c0 RCX: 0000000000000282
RDX: 0000000000000000 RSI: 00000000000000fc RDI: 00000000014000c0
RBP: ffff8801d95b7c18 R08: 0000000000036f48 R09: ffffed003b200ed8
R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801d90076c0
R13: ffff8801dad80000 R14: 0000000000000000 R15: ffff8801d90076bf
FS: 00007f4fe57f0700(0000) GS:ffff8801db000000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000000000590a CR3: 00000001ad282000 CR4: 00000000001426f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
kasan_slab_alloc+0x12/0x20 mm/kasan/kasan.c:490
slab_post_alloc_hook mm/slab.h:444 [inline]
slab_alloc mm/slab.c:3392 [inline]
kmem_cache_alloc+0x11b/0x760 mm/slab.c:3552
getname_flags+0xd0/0x5a0 fs/namei.c:140
getname+0x19/0x20 fs/namei.c:211
do_sys_open+0x38e/0x770 fs/open.c:1087
SYSC_openat fs/open.c:1120 [inline]
SyS_openat+0x30/0x40 fs/open.c:1114
do_syscall_64+0x29e/0x9d0 arch/x86/entry/common.c:287
entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x4487c9
RSP: 002b:00007f4fe57efda8 EFLAGS: 00000297 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00000000006dec44 RCX: 00000000004487c9
RDX: 0000000000000000 RSI: 00000000200001c0 RDI: ffffffffffffff9c
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000297 R12: 00000000006dec40
R13: 0030656c69662f2e R14: 6d766b2f7665642f R15: 000000000000000c
Code: 8b a9 68 03 00 00 4c 8b b1 70 03 00 00 4c 8b b9 78 03 00 00 48 8b 89
08 03 00 00 75 05 0f 01 c2 eb 03 0f 01 c3 48 89 4c 24 08 59 <0f> 96 81 88
56 00 00 48 89 81 00 03 00 00 48 89 99 18 03 00 00
RIP: vmx_vcpu_run+0x95f/0x25f0 arch/x86/kvm/vmx.c:9746 RSP: ffff8801d95b7368
CR2: 000000000000590a
---[ end trace 752da7ce25dee858 ]---

[Eric Biggers]

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No longer occurring (last occurred 245 days ago, with last reproducers almost 1
year ago) and looks like it might have had several different bugs mixed into the
same syzbot report.

#syz invalid