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Message-ID: <CACT4Y+bHd938t-w++LBO-yHMWP1cXpn+U=AVL+8mMfTBYk86=g@mail.gmail.com>
Date: Wed, 27 Mar 2019 14:45:24 +0100
From: Dmitry Vyukov <dvyukov@...gle.com>
To: Borislav Petkov <bp@...en8.de>
Cc: syzbot <syzbot+370a6b0f11867bf13515@...kaller.appspotmail.com>,
Frederic Weisbecker <frederic@...nel.org>,
"Gustavo A. R. Silva" <gustavo@...eddedor.com>,
"H. Peter Anvin" <hpa@...or.com>,
LKML <linux-kernel@...r.kernel.org>,
Masami Hiramatsu <mhiramat@...nel.org>,
Ingo Molnar <mingo@...hat.com>,
syzkaller-bugs <syzkaller-bugs@...glegroups.com>,
Thomas Gleixner <tglx@...utronix.de>,
"the arch/x86 maintainers" <x86@...nel.org>
Subject: Re: WARNING in arch_install_hw_breakpoint
On Wed, Mar 27, 2019 at 2:28 PM Borislav Petkov <bp@...en8.de> wrote:
>
> On Sat, Mar 23, 2019 at 11:22:06PM -0700, syzbot wrote:
> > Hello,
> >
> > syzbot found the following crash on:
> >
> > HEAD commit: fd1f297b Merge tag 'drm-fixes-2019-03-22' of git://anongit..
> > git tree: upstream
> > console output: https://syzkaller.appspot.com/x/log.txt?x=1574f56d200000
> > kernel config: https://syzkaller.appspot.com/x/.config?x=9a31fb246de2a622
> > dashboard link: https://syzkaller.appspot.com/bug?extid=370a6b0f11867bf13515
> > compiler: gcc (GCC) 9.0.0 20181231 (experimental)
> > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1157b7cf200000
> >
> > Bisection is inconclusive: the bug happens on the oldest tested release.
> >
> > bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=10ca39b3200000
> > final crash: https://syzkaller.appspot.com/x/report.txt?x=12ca39b3200000
> > console output: https://syzkaller.appspot.com/x/log.txt?x=14ca39b3200000
>
> So I've tried running your .config in both an AMD and an Intel guest
> like this:
>
> ./syz-execprog -repeat=0 repro.syz
>
> and killed it after 30K executed programs without success infd1f297b794c7
> reproducing.
>
> Either I'm missing something and my environment doesn't match yours -
> because looking at your console output it happens almost immediately
> after starting - or it has been fixed in the meantime...
Hi Boris,
There are two C reproducers available as well for this bug:
https://syzkaller.appspot.com/bug?extid=370a6b0f11867bf13515
syzbot failed to mail them because of that mess with duplicate email storm.
I was able to reproduce it now in a qemu. syzbot used GCE VMs, so it
should not depend on exact hardware too much.
I've checked out fd1f297b794c7
Took this config: https://syzkaller.appspot.com/x/.config?x=9a31fb246de2a622
Build with gcc 7.3.0, different from syzbot, so probably does not matter much.
Started qemu as:
qemu-system-x86_64 -hda wheezy.img -net
user,host=10.0.2.10,hostfwd=tcp::10022-:22 -net nic -nographic -kernel
arch/x86/boot/bzImage -append "kvm-intel.nested=1
kvm-intel.unrestricted_guest=1 kvm-intel.ept=1
kvm-intel.flexpriority=1 kvm-intel.vpid=1
kvm-intel.emulate_invalid_guest_state=1 kvm-intel.eptad=1
kvm-intel.enable_shadow_vmcs=1 kvm-intel.pml=1
kvm-intel.enable_apicv=1 console=ttyS0 root=/dev/sda
earlyprintk=serial slub_debug=UZ vsyscall=native rodata=n oops=panic
panic_on_warn=1 panic=86400 ima_policy=tcb" -enable-kvm -pidfile
vm_pid -m 2G -smp 4 -cpu host
The image is available here (but probably does not matter much too):
https://github.com/google/syzkaller/blob/master/docs/syzbot.md#crash-does-not-reproduce
And run this program:
https://syzkaller.appspot.com/text?tag=ReproC&x=15439f27200000
After few seconds I got:
root@...kaller:~# ./a.out
[ 32.485532][ T9863] ------------[ cut here ]------------
[ 32.487554][ T9863] Can't find any breakpoint slot
[ 32.487588][ T9863] WARNING: CPU: 0 PID: 9863 at
arch/x86/kernel/hw_breakpoint.c:121
arch_install_hw_breakpoint+0x2f5/0x3a0
[ 32.490993][ T9863] Kernel panic - not syncing: panic_on_warn set ...
[ 32.492379][ T9863] CPU: 0 PID: 9863 Comm: a.out Not tainted 5.1.0-rc1+ #1
[ 32.493865][ T9863] Hardware name: QEMU Standard PC (i440FX + PIIX,
1996), BIOS 1.10.2-1 04/01/2014
[ 32.495839][ T9863] Call Trace:
[ 32.496550][ T9863] dump_stack+0x154/0x1c5
[ 32.497465][ T9863] panic+0x25e/0x52c
[ 32.498070][ T9863] ? refcount_error_report+0x214/0x214
[ 32.498915][ T9863] ? kmsg_dump_rewind_nolock+0xe4/0xe4
[ 32.499763][ T9863] ? __probe_kernel_read+0x168/0x1c0
[ 32.500598][ T9863] ? __warn+0x1cf/0x200
[ 32.501253][ T9863] ? arch_install_hw_breakpoint+0x2f5/0x3a0
[ 32.502173][ T9863] __warn+0x1ea/0x200
[ 32.502794][ T9863] ? arch_install_hw_breakpoint+0x2f5/0x3a0
[ 32.503755][ T9863] report_bug+0x1f4/0x2b0
[ 32.504446][ T9863] fixup_bug.part.12+0x37/0x80
[ 32.505198][ T9863] do_error_trap+0x155/0x180
[ 32.505918][ T9863] do_invalid_op+0x36/0x40
[ 32.506614][ T9863] ? arch_install_hw_breakpoint+0x2f5/0x3a0
[ 32.507542][ T9863] invalid_op+0x14/0x20
[ 32.508213][ T9863] RIP: 0010:arch_install_hw_breakpoint+0x2f5/0x3a0
[ 32.509227][ T9863] Code: ff ff 40 88 75 c8 e8 7a 0b 78 00 0f b6 75
c8 e9 0c ff ff ff 48 c7 c7 80 ca 04 87 89 45 d4 c6 05 0f 05 cb 07 01
e8 9b 3c 1a 00 <0f> 0b 8b 45 d4 e9 a0 fd ff ff 48 89 df 48 89 75 c0 e8
a5 0b 78 00
[ 32.512254][ T9863] RSP: 0018:ffff88805f6f76f0 EFLAGS: 00010086
[ 32.513196][ T9863] RAX: 0000000000000000 RBX: ffff88806c81ec98
RCX: ffffffff8155e8c8
[ 32.514428][ T9863] RDX: 0000000040000000 RSI: 0000000000000004
RDI: 0000000000000000
[ 32.515664][ T9863] RBP: ffff88805f6f7730 R08: fffffbfff10728b1
R09: fffffbfff10728b1
[ 32.516903][ T9863] R10: ffff88805f6f7760 R11: fffffbfff10728b0
R12: ffff888063b6b1c0
[ 32.518177][ T9863] R13: 000000000001eca0 R14: 0000000000000004
R15: dffffc0000000000
[ 32.519402][ T9863] ? vprintk_func+0x68/0x190
[ 32.520111][ T9863] hw_breakpoint_add+0x8d/0x110
[ 32.520866][ T9863] event_sched_in.isra.99+0x323/0xb20
[ 32.521698][ T9863] group_sched_in+0xd3/0x3b0
[ 32.522404][ T9863] flexible_sched_in+0x58d/0x900
[ 32.523163][ T9863] visit_groups_merge+0x2f7/0x560
[ 32.523936][ T9863] ? pinned_sched_in+0x940/0x940
[ 32.524699][ T9863] ? perf_mux_hrtimer_restart+0x250/0x250
[ 32.525591][ T9863] ctx_sched_in+0x2a9/0x630
[ 32.526285][ T9863] ? visit_groups_merge+0x560/0x560
[ 32.527088][ T9863] perf_event_sched_in+0x6d/0xa0
[ 32.527865][ T9863] __perf_event_task_sched_in+0x6ae/0x820
[ 32.528741][ T9863] ? perf_sched_cb_inc+0x230/0x230
[ 32.529531][ T9863] ? rcu_read_lock_sched_held+0x108/0x120
[ 32.530408][ T9863] ? __switch_to+0xdd3/0x1170
[ 32.531123][ T9863] ? __switch_to_asm+0x34/0x70
[ 32.531851][ T9863] ? __switch_to_asm+0x40/0x70
[ 32.532580][ T9863] finish_task_switch+0x474/0x780
[ 32.533370][ T9863] ? __switch_to_asm+0x34/0x70
[ 32.534100][ T9863] ? __switch_to_asm+0x40/0x70
[ 32.534789][ T9863] __schedule+0x8d1/0x1f80
[ 32.535418][ T9863] ? __sched_text_start+0x8/0x8
[ 32.536104][ T9863] ? lock_downgrade+0x8f0/0x8f0
[ 32.536801][ T9863] schedule+0x7f/0x180
[ 32.537382][ T9863] ptrace_stop+0x3de/0x8d0
[ 32.538030][ T9863] get_signal+0xe54/0x19e0
[ 32.538671][ T9863] ? _raw_spin_unlock_irqrestore+0x6a/0xe0
[ 32.539541][ T9863] do_signal+0x87/0x1ab0
[ 32.540180][ T9863] ? lock_downgrade+0x8f0/0x8f0
[ 32.540902][ T9863] ? debug_smp_processor_id+0x2f/0x240
[ 32.541719][ T9863] ? kasan_check_read+0x11/0x20
[ 32.542444][ T9863] ? setup_sigcontext+0x7d0/0x7d0
[ 32.543189][ T9863] ? do_send_specific+0x122/0x1b0
[ 32.543934][ T9863] ? do_rt_tgsigqueueinfo+0x7d/0xc0
[ 32.544722][ T9863] ? lockdep_hardirqs_on+0x424/0x5c0
[ 32.545536][ T9863] ? trace_hardirqs_on+0x52/0x1d0
[ 32.546299][ T9863] exit_to_usermode_loop+0x1ee/0x260
[ 32.547127][ T9863] do_syscall_64+0x490/0x570
[ 32.547867][ T9863] entry_SYSCALL_64_after_hwframe+0x49/0xbe
[ 32.548790][ T9863] RIP: 0033:0x43f399
[ 32.549379][ T9863] Code: e8 8c e7 ff ff 48 83 c4 18 c3 0f 1f 80 00
00 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b
4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 7b cd fc ff c3 66 2e 0f 1f 84
00 00 00 00
[ 32.552296][ T9863] RSP: 002b:00007fa8f1e49d78 EFLAGS: 00000217
ORIG_RAX: 0000000000000129
[ 32.553486][ T9863] RAX: 0000000000000000 RBX: 0000000000000000
RCX: 000000000043f399
[ 32.554608][ T9863] RDX: 0000000000000016 RSI: 0000000000002687
RDI: 0000000000002687
[ 32.555729][ T9863] RBP: 00007fa8f1e49da0 R08: 0000000000000000
R09: 0000000000000000
[ 32.556901][ T9863] R10: 0000000020000100 R11: 0000000000000217
R12: 0000000000000000
[ 32.558088][ T9863] R13: 00007fffc60836af R14: 00007fa8f1e4a700
R15: 0000000000000000
[ 32.559268][ T9863]
[ 32.559271][ T9863] ======================================================
[ 32.559272][ T9863] WARNING: possible circular locking dependency detected
[ 32.559273][ T9863] 5.1.0-rc1+ #1 Not tainted
[ 32.559275][ T9863] ------------------------------------------------------
[ 32.559277][ T9863] a.out/9863 is trying to acquire lock:
[ 32.559278][ T9863] 000000005cd47422 ((console_sem).lock){-.-.},
at: down_trylock+0x13/0x70
[ 32.559282][ T9863]
[ 32.559283][ T9863] but task is already holding lock:
[ 32.559284][ T9863] 000000009ed979ab (&ctx->lock){....}, at:
__perf_event_task_sched_in+0x4e5/0x820
[ 32.559289][ T9863]
[ 32.559290][ T9863] which lock already depends on the new lock.
[ 32.559291][ T9863]
[ 32.559292][ T9863]
[ 32.559293][ T9863] the existing dependency chain (in reverse order) is:
[ 32.559294][ T9863]
[ 32.559295][ T9863] -> #3 (&ctx->lock){....}:
[ 32.559299][ T9863] lock_acquire+0x174/0x400
[ 32.559300][ T9863] _raw_spin_lock+0x2d/0x40
[ 32.559302][ T9863] __perf_event_task_sched_out+0x70a/0x1390
[ 32.559303][ T9863] __schedule+0xcf9/0x1f80
[ 32.559305][ T9863] preempt_schedule_common+0x35/0xe0
[ 32.559306][ T9863] preempt_schedule+0x23/0x30
[ 32.559307][ T9863] ___preempt_schedule+0x16/0x18
[ 32.559309][ T9863] _raw_spin_unlock_irqrestore+0xbf/0xe0
[ 32.559310][ T9863] try_to_wake_up+0xc4/0x1030
[ 32.559311][ T9863] wake_up_q+0x8a/0xe0
[ 32.559312][ T9863] futex_wake+0x3b0/0x450
[ 32.559314][ T9863] do_futex+0x4fb/0x1910
[ 32.559315][ T9863] __x64_sys_futex+0x2c9/0x3c0
[ 32.559316][ T9863] do_syscall_64+0xe7/0x570
[ 32.559318][ T9863] entry_SYSCALL_64_after_hwframe+0x49/0xbe
[ 32.559318][ T9863]
[ 32.559319][ T9863] -> #2 (&rq->lock){-.-.}:
[ 32.559323][ T9863] lock_acquire+0x174/0x400
[ 32.559325][ T9863] _raw_spin_lock+0x2d/0x40
[ 32.559326][ T9863] task_fork_fair+0x67/0x4c0
[ 32.559327][ T9863] sched_fork+0x3a8/0x8d0
[ 32.559328][ T9863] copy_process.part.34+0x18d7/0x6df0
[ 32.559330][ T9863] _do_fork+0x1b8/0xd10
[ 32.559331][ T9863] kernel_thread+0x34/0x40
[ 32.559332][ T9863] rest_init+0x26/0x300
[ 32.559333][ T9863] arch_call_rest_init+0xe/0x1b
[ 32.559335][ T9863] start_kernel+0x777/0x7b1
[ 32.559336][ T9863] x86_64_start_reservations+0x2a/0x2c
[ 32.559337][ T9863] x86_64_start_kernel+0x77/0x7a
[ 32.559339][ T9863] secondary_startup_64+0xa4/0xb0
[ 32.559339][ T9863]
[ 32.559340][ T9863] -> #1 (&p->pi_lock){-.-.}:
[ 32.559344][ T9863] lock_acquire+0x174/0x400
[ 32.559346][ T9863] _raw_spin_lock_irqsave+0x99/0xd0
[ 32.559347][ T9863] try_to_wake_up+0x8b/0x1030
[ 32.559348][ T9863] wake_up_process+0x10/0x20
[ 32.559350][ T9863] __up.isra.0+0x138/0x1a0
[ 32.559351][ T9863] up+0x95/0xe0
[ 32.559352][ T9863] __up_console_sem+0xb2/0x1a0
[ 32.559353][ T9863] console_unlock+0x62d/0xd00
[ 32.559355][ T9863] do_con_write.part.24+0x1068/0x1c20
[ 32.559356][ T9863] con_write+0xb2/0xc0
[ 32.559357][ T9863] n_tty_write+0x539/0xe20
[ 32.559358][ T9863] tty_write+0x3f8/0x840
[ 32.559359][ T9863] __vfs_write+0x87/0x110
[ 32.559361][ T9863] vfs_write+0x189/0x4d0
[ 32.559362][ T9863] ksys_write+0xd8/0x1b0
[ 32.559363][ T9863] __x64_sys_write+0x73/0xb0
[ 32.559364][ T9863] do_syscall_64+0xe7/0x570
[ 32.559366][ T9863] entry_SYSCALL_64_after_hwframe+0x49/0xbe
[ 32.559367][ T9863]
[ 32.559367][ T9863] -> #0 ((console_sem).lock){-.-.}:
[ 32.559372][ T9863] __lock_acquire+0x2cb0/0x3d10
[ 32.559373][ T9863] lock_acquire+0x174/0x400
[ 32.559374][ T9863] _raw_spin_lock_irqsave+0x99/0xd0
[ 32.559376][ T9863] down_trylock+0x13/0x70
[ 32.559377][ T9863] __down_trylock_console_sem+0xa2/0x1e0
[ 32.559378][ T9863] console_trylock+0x15/0x70
[ 32.559380][ T9863] vprintk_emit+0x1b0/0x640
[ 32.559381][ T9863] vprintk_default+0x28/0x30
[ 32.559382][ T9863] vprintk_func+0x61/0x190
[ 32.559383][ T9863] printk+0xb2/0xdd
[ 32.559384][ T9863] __warn_printk+0x96/0xf0
[ 32.559386][ T9863] arch_install_hw_breakpoint+0x2f5/0x3a0
[ 32.559387][ T9863] hw_breakpoint_add+0x8d/0x110
[ 32.559389][ T9863] event_sched_in.isra.99+0x323/0xb20
[ 32.559390][ T9863] group_sched_in+0xd3/0x3b0
[ 32.559391][ T9863] flexible_sched_in+0x58d/0x900
[ 32.559393][ T9863] visit_groups_merge+0x2f7/0x560
[ 32.559394][ T9863] ctx_sched_in+0x2a9/0x630
[ 32.559395][ T9863] perf_event_sched_in+0x6d/0xa0
[ 32.559397][ T9863] __perf_event_task_sched_in+0x6ae/0x820
[ 32.559398][ T9863] finish_task_switch+0x474/0x780
[ 32.559400][ T9863] __schedule+0x8d1/0x1f80
[ 32.559401][ T9863] schedule+0x7f/0x180
[ 32.559402][ T9863] ptrace_stop+0x3de/0x8d0
[ 32.559403][ T9863] get_signal+0xe54/0x19e0
[ 32.559404][ T9863] do_signal+0x87/0x1ab0
[ 32.559406][ T9863] exit_to_usermode_loop+0x1ee/0x260
[ 32.559407][ T9863] do_syscall_64+0x490/0x570
[ 32.559409][ T9863] entry_SYSCALL_64_after_hwframe+0x49/0xbe
[ 32.559409][ T9863]
[ 32.559411][ T9863] other info that might help us debug this:
[ 32.559411][ T9863]
[ 32.559412][ T9863] Chain exists of:
[ 32.559413][ T9863] (console_sem).lock --> &rq->lock --> &ctx->lock
[ 32.559418][ T9863]
[ 32.559420][ T9863] Possible unsafe locking scenario:
[ 32.559420][ T9863]
[ 32.559422][ T9863] CPU0 CPU1
[ 32.559423][ T9863] ---- ----
[ 32.559424][ T9863] lock(&ctx->lock);
[ 32.559427][ T9863] lock(&rq->lock);
[ 32.559429][ T9863] lock(&ctx->lock);
[ 32.559432][ T9863] lock((console_sem).lock);
[ 32.559434][ T9863]
[ 32.559435][ T9863] *** DEADLOCK ***
[ 32.559436][ T9863]
[ 32.559437][ T9863] 2 locks held by a.out/9863:
[ 32.559438][ T9863] #0: 0000000019eb1b5c (&cpuctx_lock){....}, at:
__perf_event_task_sched_in+0x4c4/0x820
[ 32.559443][ T9863] #1: 000000009ed979ab (&ctx->lock){....}, at:
__perf_event_task_sched_in+0x4e5/0x820
[ 32.559448][ T9863]
[ 32.559449][ T9863] stack backtrace:
[ 32.559451][ T9863] CPU: 0 PID: 9863 Comm: a.out Not tainted 5.1.0-rc1+ #1
[ 32.559453][ T9863] Hardware name: QEMU Standard PC (i440FX + PIIX,
1996), BIOS 1.10.2-1 04/01/2014
[ 32.559454][ T9863] Call Trace:
[ 32.559455][ T9863] dump_stack+0x154/0x1c5
[ 32.559457][ T9863] print_circular_bug.isra.37+0x2a0/0x350
[ 32.559458][ T9863] ? save_trace+0xe0/0x2b0
[ 32.559459][ T9863] check_prev_add.constprop.49+0x1932/0x29c0
[ 32.559460][ T9863] ? check_usage+0xaf0/0xaf0
[ 32.559462][ T9863] ? check_prev_add.constprop.49+0x1617/0x29c0
[ 32.559463][ T9863] ? graph_lock+0x7b/0x1f0
[ 32.559464][ T9863] ? add_lock_to_list.isra.28+0x400/0x400
[ 32.559466][ T9863] ? perf_event_bpf_output+0x250/0x250
[ 32.559467][ T9863] __lock_acquire+0x2cb0/0x3d10
[ 32.559468][ T9863] ? __lock_acquire+0x2cb0/0x3d10
[ 32.559470][ T9863] ? add_lock_to_list.isra.28+0x400/0x400
[ 32.559471][ T9863] ? mark_held_locks+0xf0/0xf0
[ 32.559472][ T9863] ? kvm_sched_clock_read+0x9/0x20
[ 32.559473][ T9863] ? sched_clock+0x31/0x40
[ 32.559474][ T9863] lock_acquire+0x174/0x400
[ 32.559476][ T9863] ? down_trylock+0x13/0x70
[ 32.559477][ T9863] ? vprintk_emit+0x1b0/0x640
[ 32.559478][ T9863] ? vprintk_emit+0x1b0/0x640
[ 32.559479][ T9863] _raw_spin_lock_irqsave+0x99/0xd0
[ 32.559480][ T9863] ? down_trylock+0x13/0x70
[ 32.559482][ T9863] down_trylock+0x13/0x70
[ 32.559483][ T9863] ? vprintk_emit+0x1b0/0x640
[ 32.559484][ T9863] __down_trylock_console_sem+0xa2/0x1e0
[ 32.559485][ T9863] console_trylock+0x15/0x70
[ 32.559486][ T9863] vprintk_emit+0x1b0/0x640
[ 32.559487][ T9863] vprintk_default+0x28/0x30
[ 32.559489][ T9863] vprintk_func+0x61/0x190
[ 32.559490][ T9863] printk+0xb2/0xdd
[ 32.559491][ T9863] ? kmsg_dump_rewind_nolock+0xe4/0xe4
[ 32.559492][ T9863] ? __warn_printk+0x8a/0xf0
[ 32.559493][ T9863] __warn_printk+0x96/0xf0
[ 32.559495][ T9863] ? test_taint+0x20/0x20
[ 32.559496][ T9863] arch_install_hw_breakpoint+0x2f5/0x3a0
[ 32.559497][ T9863] hw_breakpoint_add+0x8d/0x110
[ 32.559499][ T9863] event_sched_in.isra.99+0x323/0xb20
[ 32.559500][ T9863] group_sched_in+0xd3/0x3b0
[ 32.559501][ T9863] flexible_sched_in+0x58d/0x900
[ 32.559502][ T9863] visit_groups_merge+0x2f7/0x560
[ 32.559503][ T9863] ? pinned_sched_in+0x940/0x940
[ 32.559505][ T9863] ? perf_mux_hrtimer_restart+0x250/0x250
[ 32.559506][ T9863] ctx_sched_in+0x2a9/0x630
[ 32.559507][ T9863] ? visit_groups_merge+0x560/0x560
[ 32.559508][ T9863] perf_event_sched_in+0x6d/0xa0
[ 32.559510][ T9863] __perf_event_task_sched_in+0x6ae/0x820
[ 32.559511][ T9863] ? perf_sched_cb_inc+0x230/0x230
[ 32.559512][ T9863] ? rcu_read_lock_sched_held+0x108/0x120
[ 32.559514][ T9863] ? __switch_to+0xdd3/0x1170
[ 32.559515][ T9863] ? __switch_to_asm+0x34/0x70
[ 32.559516][ T9863] ? __switch_to_asm+0x40/0x70
[ 32.559517][ T9863] finish_task_switch+0x474/0x780
[ 32.559519][ T9863] ? __switch_to_asm+0x34/0x70
[ 32.559520][ T9863] ? __switch_to_asm+0x40/0x70
[ 32.559521][ T9863] __schedule+0x8d1/0x1f80
[ 32.559522][ T9863] ? __sched_text_start+0x8/0x8
[ 32.559523][ T9863] ? lock_downgrade+0x8f0/0x8f0
[ 32.559524][ T9863] schedule+0x7f/0x180
[ 32.559525][ T9863] ptrace_stop+0x3de/0x8d0
[ 32.559527][ T9863] get_signal+0xe54/0x19e0
[ 32.559528][ T9863] ? _raw_spin_unlock_irqrestore+0x6a/0xe0
[ 32.559529][ T9863] do_signal+0x87/0x1ab0
[ 32.559530][ T9863] ? lock_downgrade+0x8f0/0x8f0
[ 32.559532][ T9863] ? debug_smp_processor_id+0x2f/0x240
[ 32.559533][ T9863] ? kasan_check_read+0x11/0x20
[ 32.559534][ T9863] ? setup_sigcontext+0x7d0/0x7d0
[ 32.559535][ T9863] ? do_send_specific+0x122/0x1b0
[ 32.559537][ T9863] ? do_rt_tgsigqueueinfo+0x7d/0xc0
[ 32.559538][ T9863] ? lockdep_hardirqs_on+0x424/0x5c0
[ 32.559539][ T9863] ? trace_hardirqs_on+0x52/0x1d0
[ 32.559541][ T9863] exit_to_usermode_loop+0x1ee/0x260
[ 32.559542][ T9863] do_syscall_64+0x490/0x570
[ 32.559543][ T9863] entry_SYSCALL_64_after_hwframe+0x49/0xbe
[ 32.559544][ T9863] RIP: 0033:0x43f399
[ 32.559548][ T9863] Code: e8 8c e7 ff ff 48 83 c4 18 c3 0f 1f 80 00
00 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b
4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 7b cd fc ff c3 66 2e 0f 1f 84
00 00 00 00
[ 32.559550][ T9863] RSP: 002b:00007fa8f1e49d78 EFLAGS: 00000217
ORIG_RAX: 0000000000000129
[ 32.559553][ T9863] RAX: 0000000000000000 RBX: 0000000000000000
RCX: 000000000043f399
[ 32.559554][ T9863] RDX: 0000000000000016 RSI: 0000000000002687
RDI: 0000000000002687
[ 32.559556][ T9863] RBP: 00007fa8f1e49da0 R08: 0000000000000000
R09: 0000000000000000
[ 32.559558][ T9863] R10: 0000000020000100 R11: 0000000000000217
R12: 0000000000000000
[ 32.559560][ T9863] R13: 00007fffc60836af R14: 00007fa8f1e4a700
R15: 0000000000000000
[ 33.631694][ T9863] Shutting down cpus with NMI
[ 33.759774][ T9863] Kernel Offset: disabled
[ 33.760308][ T9863] Rebooting in 86400 seconds..
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