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* BUG: stack guard page was hit in pvclock_clocksource_read
@ 2020-07-21 17:43 syzbot
  2020-07-21 18:02 ` Andy Lutomirski
  0 siblings, 1 reply; 2+ messages in thread
From: syzbot @ 2020-07-21 17:43 UTC (permalink / raw)
  To: bp, hpa, jgross, linux-kernel, mingo, netdev, pbonzini,
	syzkaller-bugs, tglx, vincenzo.frascino, x86

Hello,

syzbot found the following issue on:

HEAD commit:    473309fb net: dp83640: fix SIOCSHWTSTAMP to update the str..
git tree:       net
console output: https://syzkaller.appspot.com/x/log.txt?x=175443e7100000
kernel config:  https://syzkaller.appspot.com/x/.config?x=368e8612711aa2cc
dashboard link: https://syzkaller.appspot.com/bug?extid=33db977d6e575c4884b1
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+33db977d6e575c4884b1@syzkaller.appspotmail.com

BUG: stack guard page was hit at 00000000568268d5 (stack is 00000000fd6fd35d..00000000fd6d22ec)
kernel stack overflow (double-fault): 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 30079 Comm: syz-executor.0 Not tainted 5.8.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:pvclock_clocksource_read+0x21/0x510 arch/x86/kernel/pvclock.c:68
Code: 2e 0f 1f 84 00 00 00 00 00 48 ba 00 00 00 00 00 fc ff df 48 89 f8 41 57 48 c1 e8 03 41 56 41 55 41 54 4c 8d 67 03 55 4c 89 e1 <53> 48 c1 e9 03 48 89 fb 48 83 ec 58 0f b6 04 10 0f b6 14 11 48 89
RSP: 0018:ffffc90016598000 EFLAGS: 00010806
RAX: 1ffffffff17cec00 RBX: ffff8880ae620dc0 RCX: ffffffff8be76003
RDX: dffffc0000000000 RSI: 0000000000000001 RDI: ffffffff8be76000
RBP: ffff888059596380 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff8be76003
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
FS:  00007f3e110c1700(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffc90016597ff8 CR3: 000000005d14d000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 kvm_clock_read arch/x86/kernel/kvmclock.c:90 [inline]
 kvm_sched_clock_read+0x14/0x40 arch/x86/kernel/kvmclock.c:102
 paravirt_sched_clock arch/x86/include/asm/paravirt.h:22 [inline]
 sched_clock+0x2a/0x40 arch/x86/kernel/tsc.c:252
 sched_clock_cpu+0x18/0x1b0 kernel/sched/clock.c:371
 irqtime_account_irq+0x63/0x280 kernel/sched/cputime.c:60
 account_irq_enter_time include/linux/vtime.h:109 [inline]
 irq_enter_rcu+0x61/0x140 kernel/softirq.c:356
 sysvec_apic_timer_interrupt+0x13/0x120 arch/x86/kernel/apic/apic.c:1091
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:587
RIP: 0010:__orc_find+0x9b/0xf0 arch/x86/kernel/unwind_orc.c:58
Code: d8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 48 48 63 03 48 01 d8 48 39 c1 73 b0 4c 8d 63 fc 49 39 ec 73 b3 4d 29 ee 49 c1 fe 02 <4b> 8d 04 76 48 8d 04 46 48 83 c4 10 5b 5d 41 5c 41 5d 41 5e 41 5f
RSP: 0018:ffffc90016598190 EFLAGS: 00000246
RAX: ffffffff84b1c69e RBX: ffffffff8ae8fef8 RCX: ffffffff84b1cb81
RDX: 0000000000000000 RSI: ffffffff8b5be90e RDI: ffffffff8ae8fef8
RBP: ffffffff8ae8fefc R08: ffffffff8b5be944 R09: ffffffff8b5be90e
R10: 000000000007201e R11: 00000000000c2499 R12: ffffffff8ae8fef8
R13: ffffffff8ae8fef8 R14: 0000000000000000 R15: dffffc0000000000
 orc_find arch/x86/kernel/unwind_orc.c:172 [inline]
 unwind_next_frame+0x342/0x1f90 arch/x86/kernel/unwind_orc.c:446
 arch_stack_walk+0x81/0xf0 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0x8c/0xc0 kernel/stacktrace.c:123
 save_stack+0x1b/0x40 mm/kasan/common.c:48
 set_track mm/kasan/common.c:56 [inline]
 __kasan_kmalloc.constprop.0+0xc2/0xd0 mm/kasan/common.c:494
 __kmalloc_reserve net/core/skbuff.c:142 [inline]
 pskb_expand_head+0x15a/0x1040 net/core/skbuff.c:1627
 netlink_trim+0x1ea/0x240 net/netlink/af_netlink.c:1285
 netlink_broadcast_filtered+0x65/0xdc0 net/netlink/af_netlink.c:1490
 netlink_broadcast net/netlink/af_netlink.c:1535 [inline]
 nlmsg_multicast include/net/netlink.h:1020 [inline]
 nlmsg_notify+0x90/0x250 net/netlink/af_netlink.c:2512
 rtnl_notify net/core/rtnetlink.c:737 [inline]
 rtmsg_ifinfo_send net/core/rtnetlink.c:3725 [inline]
 rtmsg_ifinfo_event net/core/rtnetlink.c:3740 [inline]
 rtmsg_ifinfo_event net/core/rtnetlink.c:3728 [inline]
 rtnetlink_event+0x193/0x1d0 net/core/rtnetlink.c:5511
 notifier_call_chain+0xb5/0x200 kernel/notifier.c:83
 call_netdevice_notifiers_info+0xb5/0x130 net/core/dev.c:2027
 call_netdevice_notifiers_extack net/core/dev.c:2039 [inline]
 call_netdevice_notifiers net/core/dev.c:2053 [inline]
 netdev_features_change net/core/dev.c:1443 [inline]
 netdev_sync_lower_features net/core/dev.c:9056 [inline]
 __netdev_update_features+0x88d/0x1360 net/core/dev.c:9187
 netdev_change_features+0x61/0xb0 net/core/dev.c:9259
 bond_compute_features+0x502/0xa00 drivers/net/bonding/bond_main.c:1188
 bond_slave_netdev_event drivers/net/bonding/bond_main.c:3237 [inline]
 bond_netdev_event+0x81f/0xb30 drivers/net/bonding/bond_main.c:3277
 notifier_call_chain+0xb5/0x200 kernel/notifier.c:83
 call_netdevice_notifiers_info+0xb5/0x130 net/core/dev.c:2027
 call_netdevice_notifiers_extack net/core/dev.c:2039 [inline]
 call_netdevice_notifiers net/core/dev.c:2053 [inline]
 netdev_features_change net/core/dev.c:1443 [inline]
 netdev_sync_lower_features net/core/dev.c:9056 [inline]
 __netdev_update_features+0x88d/0x1360 net/core/dev.c:9187
 netdev_change_features+0x61/0xb0 net/core/dev.c:9259
 bond_compute_features+0x502/0xa00 drivers/net/bonding/bond_main.c:1188
 bond_slave_netdev_event drivers/net/bonding/bond_main.c:3237 [inline]
 bond_netdev_event+0x81f/0xb30 drivers/net/bonding/bond_main.c:3277
 notifier_call_chain+0xb5/0x200 kernel/notifier.c:83
 call_netdevice_notifiers_info+0xb5/0x130 net/core/dev.c:2027
 call_netdevice_notifiers_extack net/core/dev.c:2039 [inline]
 call_netdevice_notifiers net/core/dev.c:2053 [inline]
 netdev_features_change net/core/dev.c:1443 [inline]
 netdev_sync_lower_features net/core/dev.c:9056 [inline]
 __netdev_update_features+0x88d/0x1360 net/core/dev.c:9187
 netdev_change_features+0x61/0xb0 net/core/dev.c:9259
 bond_compute_features+0x502/0xa00 drivers/net/bonding/bond_main.c:1188
 bond_slave_netdev_event drivers/net/bonding/bond_main.c:3237 [inline]
 bond_netdev_event+0x81f/0xb30 drivers/net/bonding/bond_main.c:3277
 notifier_call_chain+0xb5/0x200 kernel/notifier.c:83
 call_netdevice_notifiers_info+0xb5/0x130 net/core/dev.c:2027
 call_netdevice_notifiers_extack net/core/dev.c:2039 [inline]
 call_netdevice_notifiers net/core/dev.c:2053 [inline]
 netdev_features_change net/core/dev.c:1443 [inline]
 netdev_sync_lower_features net/core/dev.c:9056 [inline]
 __netdev_update_features+0x88d/0x1360 net/core/dev.c:9187
 netdev_change_features+0x61/0xb0 net/core/dev.c:9259
 bond_compute_features+0x502/0xa00 drivers/net/bonding/bond_main.c:1188
 bond_slave_netdev_event drivers/net/bonding/bond_main.c:3237 [inline]
 bond_netdev_event+0x81f/0xb30 drivers/net/bonding/bond_main.c:3277
Lost 627 message(s)!
---[ end trace 203af1b41d4d3a41 ]---
RIP: 0010:pvclock_clocksource_read+0x21/0x510 arch/x86/kernel/pvclock.c:68
Code: 2e 0f 1f 84 00 00 00 00 00 48 ba 00 00 00 00 00 fc ff df 48 89 f8 41 57 48 c1 e8 03 41 56 41 55 41 54 4c 8d 67 03 55 4c 89 e1 <53> 48 c1 e9 03 48 89 fb 48 83 ec 58 0f b6 04 10 0f b6 14 11 48 89
RSP: 0018:ffffc90016598000 EFLAGS: 00010806
RAX: 1ffffffff17cec00 RBX: ffff8880ae620dc0 RCX: ffffffff8be76003
RDX: dffffc0000000000 RSI: 0000000000000001 RDI: ffffffff8be76000
RBP: ffff888059596380 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff8be76003
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
FS:  00007f3e110c1700(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffc90016597ff8 CR3: 000000005d14d000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400


---
This report 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 issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.

^ permalink raw reply	[flat|nested] 2+ messages in thread
* Re: BUG: stack guard page was hit in pvclock_clocksource_read
  2020-07-21 17:43 BUG: stack guard page was hit in pvclock_clocksource_read syzbot
@ 2020-07-21 18:02 ` Andy Lutomirski
  0 siblings, 0 replies; 2+ messages in thread
From: Andy Lutomirski @ 2020-07-21 18:02 UTC (permalink / raw)
  To: syzbot
  Cc: Borislav Petkov, H. Peter Anvin, Juergen Gross, LKML,
	Ingo Molnar, Network Development, Paolo Bonzini, syzkaller-bugs,
	Thomas Gleixner, Vincenzo Frascino, X86 ML

On Tue, Jul 21, 2020 at 10:43 AM syzbot
<syzbot+33db977d6e575c4884b1@syzkaller.appspotmail.com> wrote:
>
> Hello,
>
> syzbot found the following issue on:
>
> HEAD commit:    473309fb net: dp83640: fix SIOCSHWTSTAMP to update the str..
> git tree:       net
> console output: https://syzkaller.appspot.com/x/log.txt?x=175443e7100000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=368e8612711aa2cc
> dashboard link: https://syzkaller.appspot.com/bug?extid=33db977d6e575c4884b1
> 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+33db977d6e575c4884b1@syzkaller.appspotmail.com
>
> BUG: stack guard page was hit at 00000000568268d5 (stack is 00000000fd6fd35d..00000000fd6d22ec)
> kernel stack overflow (double-fault): 0000 [#1] PREEMPT SMP KASAN
> CPU: 0 PID: 30079 Comm: syz-executor.0 Not tainted 5.8.0-rc4-syzkaller #0
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
> RIP: 0010:pvclock_clocksource_read+0x21/0x510 arch/x86/kernel/pvclock.c:68
> Code: 2e 0f 1f 84 00 00 00 00 00 48 ba 00 00 00 00 00 fc ff df 48 89 f8 41 57 48 c1 e8 03 41 56 41 55 41 54 4c 8d 67 03 55 4c 89 e1 <53> 48 c1 e9 03 48 89 fb 48 83 ec 58 0f b6 04 10 0f b6 14 11 48 89
> RSP: 0018:ffffc90016598000 EFLAGS: 00010806
> RAX: 1ffffffff17cec00 RBX: ffff8880ae620dc0 RCX: ffffffff8be76003
> RDX: dffffc0000000000 RSI: 0000000000000001 RDI: ffffffff8be76000
> RBP: ffff888059596380 R08: 0000000000000001 R09: 0000000000000000
> R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff8be76003
> R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
> FS:  00007f3e110c1700(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000
> CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: ffffc90016597ff8 CR3: 000000005d14d000 CR4: 00000000001406f0
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> Call Trace:
>  kvm_clock_read arch/x86/kernel/kvmclock.c:90 [inline]
>  kvm_sched_clock_read+0x14/0x40 arch/x86/kernel/kvmclock.c:102
>  paravirt_sched_clock arch/x86/include/asm/paravirt.h:22 [inline]
>  sched_clock+0x2a/0x40 arch/x86/kernel/tsc.c:252
>  sched_clock_cpu+0x18/0x1b0 kernel/sched/clock.c:371
>  irqtime_account_irq+0x63/0x280 kernel/sched/cputime.c:60
>  account_irq_enter_time include/linux/vtime.h:109 [inline]
>  irq_enter_rcu+0x61/0x140 kernel/softirq.c:356
>  sysvec_apic_timer_interrupt+0x13/0x120 arch/x86/kernel/apic/apic.c:1091
>  asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:587
> RIP: 0010:__orc_find+0x9b/0xf0 arch/x86/kernel/unwind_orc.c:58
> Code: d8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 48 48 63 03 48 01 d8 48 39 c1 73 b0 4c 8d 63 fc 49 39 ec 73 b3 4d 29 ee 49 c1 fe 02 <4b> 8d 04 76 48 8d 04 46 48 83 c4 10 5b 5d 41 5c 41 5d 41 5e 41 5f
> RSP: 0018:ffffc90016598190 EFLAGS: 00000246
> RAX: ffffffff84b1c69e RBX: ffffffff8ae8fef8 RCX: ffffffff84b1cb81
> RDX: 0000000000000000 RSI: ffffffff8b5be90e RDI: ffffffff8ae8fef8
> RBP: ffffffff8ae8fefc R08: ffffffff8b5be944 R09: ffffffff8b5be90e
> R10: 000000000007201e R11: 00000000000c2499 R12: ffffffff8ae8fef8
> R13: ffffffff8ae8fef8 R14: 0000000000000000 R15: dffffc0000000000
>  orc_find arch/x86/kernel/unwind_orc.c:172 [inline]
>  unwind_next_frame+0x342/0x1f90 arch/x86/kernel/unwind_orc.c:446
>  arch_stack_walk+0x81/0xf0 arch/x86/kernel/stacktrace.c:25
>  stack_trace_save+0x8c/0xc0 kernel/stacktrace.c:123
>  save_stack+0x1b/0x40 mm/kasan/common.c:48
>  set_track mm/kasan/common.c:56 [inline]
>  __kasan_kmalloc.constprop.0+0xc2/0xd0 mm/kasan/common.c:494
>  __kmalloc_reserve net/core/skbuff.c:142 [inline]
>  pskb_expand_head+0x15a/0x1040 net/core/skbuff.c:1627
>  netlink_trim+0x1ea/0x240 net/netlink/af_netlink.c:1285
>  netlink_broadcast_filtered+0x65/0xdc0 net/netlink/af_netlink.c:1490
>  netlink_broadcast net/netlink/af_netlink.c:1535 [inline]
>  nlmsg_multicast include/net/netlink.h:1020 [inline]
>  nlmsg_notify+0x90/0x250 net/netlink/af_netlink.c:2512
>  rtnl_notify net/core/rtnetlink.c:737 [inline]
>  rtmsg_ifinfo_send net/core/rtnetlink.c:3725 [inline]
>  rtmsg_ifinfo_event net/core/rtnetlink.c:3740 [inline]
>  rtmsg_ifinfo_event net/core/rtnetlink.c:3728 [inline]
>  rtnetlink_event+0x193/0x1d0 net/core/rtnetlink.c:5511
>  notifier_call_chain+0xb5/0x200 kernel/notifier.c:83
>  call_netdevice_notifiers_info+0xb5/0x130 net/core/dev.c:2027
>  call_netdevice_notifiers_extack net/core/dev.c:2039 [inline]
>  call_netdevice_notifiers net/core/dev.c:2053 [inline]
>  netdev_features_change net/core/dev.c:1443 [inline]
>  netdev_sync_lower_features net/core/dev.c:9056 [inline]
>  __netdev_update_features+0x88d/0x1360 net/core/dev.c:9187
>  netdev_change_features+0x61/0xb0 net/core/dev.c:9259
>  bond_compute_features+0x502/0xa00 drivers/net/bonding/bond_main.c:1188
>  bond_slave_netdev_event drivers/net/bonding/bond_main.c:3237 [inline]
>  bond_netdev_event+0x81f/0xb30 drivers/net/bonding/bond_main.c:3277
>  notifier_call_chain+0xb5/0x200 kernel/notifier.c:83
>  call_netdevice_notifiers_info+0xb5/0x130 net/core/dev.c:2027
>  call_netdevice_notifiers_extack net/core/dev.c:2039 [inline]
>  call_netdevice_notifiers net/core/dev.c:2053 [inline]
>  netdev_features_change net/core/dev.c:1443 [inline]
>  netdev_sync_lower_features net/core/dev.c:9056 [inline]
>  __netdev_update_features+0x88d/0x1360 net/core/dev.c:9187
>  netdev_change_features+0x61/0xb0 net/core/dev.c:9259
>  bond_compute_features+0x502/0xa00 drivers/net/bonding/bond_main.c:1188
>  bond_slave_netdev_event drivers/net/bonding/bond_main.c:3237 [inline]
>  bond_netdev_event+0x81f/0xb30 drivers/net/bonding/bond_main.c:3277
>  notifier_call_chain+0xb5/0x200 kernel/notifier.c:83
>  call_netdevice_notifiers_info+0xb5/0x130 net/core/dev.c:2027
>  call_netdevice_notifiers_extack net/core/dev.c:2039 [inline]
>  call_netdevice_notifiers net/core/dev.c:2053 [inline]
>  netdev_features_change net/core/dev.c:1443 [inline]
>  netdev_sync_lower_features net/core/dev.c:9056 [inline]
>  __netdev_update_features+0x88d/0x1360 net/core/dev.c:9187
>  netdev_change_features+0x61/0xb0 net/core/dev.c:9259
>  bond_compute_features+0x502/0xa00 drivers/net/bonding/bond_main.c:1188
>  bond_slave_netdev_event drivers/net/bonding/bond_main.c:3237 [inline]
>  bond_netdev_event+0x81f/0xb30 drivers/net/bonding/bond_main.c:3277
>  notifier_call_chain+0xb5/0x200 kernel/notifier.c:83
>  call_netdevice_notifiers_info+0xb5/0x130 net/core/dev.c:2027
>  call_netdevice_notifiers_extack net/core/dev.c:2039 [inline]
>  call_netdevice_notifiers net/core/dev.c:2053 [inline]
>  netdev_features_change net/core/dev.c:1443 [inline]
>  netdev_sync_lower_features net/core/dev.c:9056 [inline]
>  __netdev_update_features+0x88d/0x1360 net/core/dev.c:9187
>  netdev_change_features+0x61/0xb0 net/core/dev.c:9259
>  bond_compute_features+0x502/0xa00 drivers/net/bonding/bond_main.c:1188
>  bond_slave_netdev_event drivers/net/bonding/bond_main.c:3237 [inline]
>  bond_netdev_event+0x81f/0xb30 drivers/net/bonding/bond_main.c:3277
> Lost 627 message(s)!
> ---[ end trace 203af1b41d4d3a41 ]---
> RIP: 0010:pvclock_clocksource_read+0x21/0x510 arch/x86/kernel/pvclock.c:68
> Code: 2e 0f 1f 84 00 00 00 00 00 48 ba 00 00 00 00 00 fc ff df 48 89 f8 41 57 48 c1 e8 03 41 56 41 55 41 54 4c 8d 67 03 55 4c 89 e1 <53> 48 c1 e9 03 48 89 fb 48 83 ec 58 0f b6 04 10 0f b6 14 11 48 89
> RSP: 0018:ffffc90016598000 EFLAGS: 00010806
> RAX: 1ffffffff17cec00 RBX: ffff8880ae620dc0 RCX: ffffffff8be76003
> RDX: dffffc0000000000 RSI: 0000000000000001 RDI: ffffffff8be76000
> RBP: ffff888059596380 R08: 0000000000000001 R09: 0000000000000000
> R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff8be76003
> R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
> FS:  00007f3e110c1700(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000
> CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: ffffc90016597ff8 CR3: 000000005d14d000 CR4: 00000000001406f0
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
>
>
> ---
> This report 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 issue. See:
> https://goo.gl/tpsmEJ#status for how to communicate with syzbot.

#syz dup: BUG: stack guard page was hit in deref_stack_reg

^ permalink raw reply	[flat|nested] 2+ messages in thread
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2020-07-21 17:43 BUG: stack guard page was hit in pvclock_clocksource_read syzbot
2020-07-21 18:02 ` Andy Lutomirski

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