From: ebiederm@xmission.com (Eric W. Biederman)
To: Sasha Levin <levinsasha928@gmail.com>
Cc: Dave Jones <davej@redhat.com>,
kexec@lists.infradead.org,
linux-kernel <linux-kernel@vger.kernel.org>
Subject: Re: BUG: unable to handle kernel paging request at ffffc7ff81000398 (sys_kexec_load)
Date: Sat, 21 Jan 2012 20:49:26 -0800 [thread overview]
Message-ID: <m1lip0s5nt.fsf@fess.ebiederm.org> (raw)
In-Reply-To: <1327212367.32115.4.camel@lappy> (Sasha Levin's message of "Sun, 22 Jan 2012 01:06:07 -0500")
Sasha Levin <levinsasha928@gmail.com> writes:
> Hi All,
>
> I got the following BUG() while running trinity within KVM tool.
>
> It looks like the result of a kexec_load(), but I couldn't find any
> mention of it in the logs - which is strange since logs are supposed
> to be flushed before actual syscall runs.
Interesting.
The fact that this happens in native_set_pte would suggest that we are
trying to write to a page table that does not exist. So this might
be a layer below kexec_load that has the problem.
Do you have the kernel you were testing? A disassembly of the
native_set_pte, machine_kexec_prepare and sys_kexec_load
would be interesting, for attempting to trace this back to what went
wrong.
Eric
> [ 3515.829231] BUG: unable to handle kernel paging request at ffffc7ff81000398
> [ 3515.830041] IP: [<ffffffff81077281>] native_set_pte+0x1/0x10
> [ 3515.830041] PGD 0
> [ 3515.830041] Oops: 0002 [#1] PREEMPT SMP
> [ 3515.830041] CPU 0
> [ 3515.830041] Pid: 17125, comm: trinity Not tainted 3.2.0-next-20120119-sasha-00001-gfaa12a9-dirty #129
> [ 3515.830041] RIP: 0010:[<ffffffff81077281>] [<ffffffff81077281>] native_set_pte+0x1/0x10
> [ 3515.830041] RSP: 0018:ffff8800066a7e48 EFLAGS: 00010282
> [ 3515.830041] RAX: 00003ffffffff000 RBX: ffff880005deb040 RCX: 00003ffffffff000
> [ 3515.830041] RDX: 00003fff81000000 RSI: 0000000006657163 RDI: ffffc7ff81000398
> [ 3515.830041] RBP: ffff8800066a7ed8 R08: ffffea0000199de0 R09: ffff88000ff15140
> [ 3515.830041] R10: 0000000005deb000 R11: 0000000000000001 R12: 0000000000000398
> [ 3515.830041] R13: 0000000006657000 R14: 0000008000000000 R15: 0001000000000000
> [ 3515.830041] FS: 00007fc64b475700(0000) GS:ffff880013a00000(0000) knlGS:0000000000000000
> [ 3515.830041] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
> [ 3515.830041] CR2: ffffc7ff81000398 CR3: 0000000006749000 CR4: 00000000000406f0
> [ 3515.830041] DR0: ffffffff810aaee0 DR1: 0000000000000000 DR2: 0000000000000000
> [ 3515.830041] DR3: 0000000000000000 DR6: 00000000ffff4ff0 DR7: 0000000000000600
> [ 3515.830041] Process trinity (pid: 17125, threadinfo ffff8800066a6000, task ffff880005f90000)
> [ 3515.830041] Stack:
> [ 3515.830041] ffff8800066a7ed8 ffffffff81071d06 ffff8800066a7e78 ffff88000ff15000
> [ 3515.830041] ffff88000b149000 ffff880006656000 ffff880006656008 0000008000000000
> [ 3515.830041] 0000008000000000 0000000014000000 ffff88000ff15000 ffff88000b149008
> [ 3515.830041] Call Trace:
> [ 3515.830041] [<ffffffff81071d06>] ? machine_kexec_prepare+0x636/0x820
> [ 3515.830041] [<ffffffff8111bb68>] ? sys_kexec_load+0x98/0x590
> [ 3515.830041] [<ffffffff8111bbd2>] sys_kexec_load+0x102/0x590
> [ 3515.830041] [<ffffffff82583d5d>] ? retint_swapgs+0x13/0x1b
> [ 3515.830041] [<ffffffff8183c29e>] ? trace_hardirqs_on_thunk+0x3a/0x3f
> [ 3515.830041] [<ffffffff82584639>] system_call_fastpath+0x16/0x1b
> [ 3515.830041] [<ffffffff81001001>] ? hypercall_page+0x1/0x1000
> [ 3515.830041] Code: 66 2e 0f 1f 84 00 00 00 00 00 55 48 8b 46 18 48 89 e5 48 89 47 04 c9 c3 66 90 55 48 89 e5 0f 01 f8 c9 c3 0f 1f 80 00 00 00 00 55 <48> 89 37 48 89 e5 c9 c3 0f 1f 80 00 00 00 00 55 48 89 37 48 89
> [ 3515.830041] RIP [<ffffffff81077281>] native_set_pte+0x1/0x10
> [ 3515.830041] RSP <ffff8800066a7e48>
> [ 3515.830041] CR2: ffffc7ff81000398
> [ 3515.830041] ---[ end trace 9813cf5a73b6d8b6 ]---
> [ 3515.830041] BUG: sleeping function called from invalid context at kernel/rwsem.c:21
> [ 3515.830041] in_atomic(): 0, irqs_disabled(): 1, pid: 17125, name: trinity
> [ 3515.830041] INFO: lockdep is turned off.
> [ 3515.830041] irq event stamp: 668
> [ 3515.830041] hardirqs last enabled at (667): [<ffffffff8116fb35>] get_page_from_freelist+0x465/0x8d0
> [ 3515.830041] hardirqs last disabled at (668): [<ffffffff82584266>] error_sti+0x5/0x6
> [ 3515.830041] softirqs last enabled at (664): [<ffffffff810b3243>] __do_softirq+0x133/0x180
> [ 3515.830041] softirqs last disabled at (641): [<ffffffff82585b6c>] call_softirq+0x1c/0x30
> [ 3515.830041] Pid: 17125, comm: trinity Tainted: G D 3.2.0-next-20120119-sasha-00001-gfaa12a9-dirty #129
> [ 3515.830041] Call Trace:
> [ 3515.830041] [<ffffffff81109fc0>] ? print_irqtrace_events+0xd0/0xe0
> [ 3515.830041] [<ffffffff810e1e29>] __might_sleep+0x149/0x200
> [ 3515.830041] [<ffffffff82580ef5>] down_read+0x25/0x90
> [ 3515.830041] [<ffffffff810bfd6f>] exit_signals+0x1f/0x140
> [ 3515.830041] [<ffffffff810b0a8d>] do_exit+0xbd/0x950
> [ 3515.830041] [<ffffffff810ad8f7>] ? kmsg_dump+0x87/0x250
> [ 3515.830041] [<ffffffff8257f9dd>] ? printk+0x63/0x65
> [ 3515.830041] [<ffffffff8104eda2>] oops_end+0xc2/0x110
> [ 3515.830041] [<ffffffff8107cb92>] no_context+0x122/0x2e0
> [ 3515.830041] [<ffffffff8107ce7d>] __bad_area_nosemaphore+0x12d/0x230
> [ 3515.830041] [<ffffffff8107cf8e>] bad_area_nosemaphore+0xe/0x10
> [ 3515.830041] [<ffffffff8107dc0f>] do_page_fault+0x41f/0x4d0
> [ 3515.830041] [<ffffffff8117081e>] ? __alloc_pages_nodemask+0x14e/0x910
> [ 3515.830041] [<ffffffff81076d11>] do_async_page_fault+0x31/0x90
> [ 3515.830041] [<ffffffff82584055>] async_page_fault+0x25/0x30
> [ 3515.830041] [<ffffffff81077281>] ? native_set_pte+0x1/0x10
> [ 3515.830041] [<ffffffff81071d06>] ? machine_kexec_prepare+0x636/0x820
> [ 3515.830041] [<ffffffff8111bb68>] ? sys_kexec_load+0x98/0x590
> [ 3515.830041] [<ffffffff8111bbd2>] sys_kexec_load+0x102/0x590
> [ 3515.830041] [<ffffffff82583d5d>] ? retint_swapgs+0x13/0x1b
> [ 3515.830041] [<ffffffff8183c29e>] ? trace_hardirqs_on_thunk+0x3a/0x3f
> [ 3515.830041] [<ffffffff82584639>] system_call_fastpath+0x16/0x1b
> [ 3515.830041] [<ffffffff81001001>] ? hypercall_page+0x1/0x1000
_______________________________________________
kexec mailing list
kexec@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/kexec
WARNING: multiple messages have this Message-ID (diff)
From: ebiederm@xmission.com (Eric W. Biederman)
To: Sasha Levin <levinsasha928@gmail.com>
Cc: Dave Jones <davej@redhat.com>,
kexec@lists.infradead.org,
linux-kernel <linux-kernel@vger.kernel.org>
Subject: Re: BUG: unable to handle kernel paging request at ffffc7ff81000398 (sys_kexec_load)
Date: Sat, 21 Jan 2012 20:49:26 -0800 [thread overview]
Message-ID: <m1lip0s5nt.fsf@fess.ebiederm.org> (raw)
In-Reply-To: <1327212367.32115.4.camel@lappy> (Sasha Levin's message of "Sun, 22 Jan 2012 01:06:07 -0500")
Sasha Levin <levinsasha928@gmail.com> writes:
> Hi All,
>
> I got the following BUG() while running trinity within KVM tool.
>
> It looks like the result of a kexec_load(), but I couldn't find any
> mention of it in the logs - which is strange since logs are supposed
> to be flushed before actual syscall runs.
Interesting.
The fact that this happens in native_set_pte would suggest that we are
trying to write to a page table that does not exist. So this might
be a layer below kexec_load that has the problem.
Do you have the kernel you were testing? A disassembly of the
native_set_pte, machine_kexec_prepare and sys_kexec_load
would be interesting, for attempting to trace this back to what went
wrong.
Eric
> [ 3515.829231] BUG: unable to handle kernel paging request at ffffc7ff81000398
> [ 3515.830041] IP: [<ffffffff81077281>] native_set_pte+0x1/0x10
> [ 3515.830041] PGD 0
> [ 3515.830041] Oops: 0002 [#1] PREEMPT SMP
> [ 3515.830041] CPU 0
> [ 3515.830041] Pid: 17125, comm: trinity Not tainted 3.2.0-next-20120119-sasha-00001-gfaa12a9-dirty #129
> [ 3515.830041] RIP: 0010:[<ffffffff81077281>] [<ffffffff81077281>] native_set_pte+0x1/0x10
> [ 3515.830041] RSP: 0018:ffff8800066a7e48 EFLAGS: 00010282
> [ 3515.830041] RAX: 00003ffffffff000 RBX: ffff880005deb040 RCX: 00003ffffffff000
> [ 3515.830041] RDX: 00003fff81000000 RSI: 0000000006657163 RDI: ffffc7ff81000398
> [ 3515.830041] RBP: ffff8800066a7ed8 R08: ffffea0000199de0 R09: ffff88000ff15140
> [ 3515.830041] R10: 0000000005deb000 R11: 0000000000000001 R12: 0000000000000398
> [ 3515.830041] R13: 0000000006657000 R14: 0000008000000000 R15: 0001000000000000
> [ 3515.830041] FS: 00007fc64b475700(0000) GS:ffff880013a00000(0000) knlGS:0000000000000000
> [ 3515.830041] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
> [ 3515.830041] CR2: ffffc7ff81000398 CR3: 0000000006749000 CR4: 00000000000406f0
> [ 3515.830041] DR0: ffffffff810aaee0 DR1: 0000000000000000 DR2: 0000000000000000
> [ 3515.830041] DR3: 0000000000000000 DR6: 00000000ffff4ff0 DR7: 0000000000000600
> [ 3515.830041] Process trinity (pid: 17125, threadinfo ffff8800066a6000, task ffff880005f90000)
> [ 3515.830041] Stack:
> [ 3515.830041] ffff8800066a7ed8 ffffffff81071d06 ffff8800066a7e78 ffff88000ff15000
> [ 3515.830041] ffff88000b149000 ffff880006656000 ffff880006656008 0000008000000000
> [ 3515.830041] 0000008000000000 0000000014000000 ffff88000ff15000 ffff88000b149008
> [ 3515.830041] Call Trace:
> [ 3515.830041] [<ffffffff81071d06>] ? machine_kexec_prepare+0x636/0x820
> [ 3515.830041] [<ffffffff8111bb68>] ? sys_kexec_load+0x98/0x590
> [ 3515.830041] [<ffffffff8111bbd2>] sys_kexec_load+0x102/0x590
> [ 3515.830041] [<ffffffff82583d5d>] ? retint_swapgs+0x13/0x1b
> [ 3515.830041] [<ffffffff8183c29e>] ? trace_hardirqs_on_thunk+0x3a/0x3f
> [ 3515.830041] [<ffffffff82584639>] system_call_fastpath+0x16/0x1b
> [ 3515.830041] [<ffffffff81001001>] ? hypercall_page+0x1/0x1000
> [ 3515.830041] Code: 66 2e 0f 1f 84 00 00 00 00 00 55 48 8b 46 18 48 89 e5 48 89 47 04 c9 c3 66 90 55 48 89 e5 0f 01 f8 c9 c3 0f 1f 80 00 00 00 00 55 <48> 89 37 48 89 e5 c9 c3 0f 1f 80 00 00 00 00 55 48 89 37 48 89
> [ 3515.830041] RIP [<ffffffff81077281>] native_set_pte+0x1/0x10
> [ 3515.830041] RSP <ffff8800066a7e48>
> [ 3515.830041] CR2: ffffc7ff81000398
> [ 3515.830041] ---[ end trace 9813cf5a73b6d8b6 ]---
> [ 3515.830041] BUG: sleeping function called from invalid context at kernel/rwsem.c:21
> [ 3515.830041] in_atomic(): 0, irqs_disabled(): 1, pid: 17125, name: trinity
> [ 3515.830041] INFO: lockdep is turned off.
> [ 3515.830041] irq event stamp: 668
> [ 3515.830041] hardirqs last enabled at (667): [<ffffffff8116fb35>] get_page_from_freelist+0x465/0x8d0
> [ 3515.830041] hardirqs last disabled at (668): [<ffffffff82584266>] error_sti+0x5/0x6
> [ 3515.830041] softirqs last enabled at (664): [<ffffffff810b3243>] __do_softirq+0x133/0x180
> [ 3515.830041] softirqs last disabled at (641): [<ffffffff82585b6c>] call_softirq+0x1c/0x30
> [ 3515.830041] Pid: 17125, comm: trinity Tainted: G D 3.2.0-next-20120119-sasha-00001-gfaa12a9-dirty #129
> [ 3515.830041] Call Trace:
> [ 3515.830041] [<ffffffff81109fc0>] ? print_irqtrace_events+0xd0/0xe0
> [ 3515.830041] [<ffffffff810e1e29>] __might_sleep+0x149/0x200
> [ 3515.830041] [<ffffffff82580ef5>] down_read+0x25/0x90
> [ 3515.830041] [<ffffffff810bfd6f>] exit_signals+0x1f/0x140
> [ 3515.830041] [<ffffffff810b0a8d>] do_exit+0xbd/0x950
> [ 3515.830041] [<ffffffff810ad8f7>] ? kmsg_dump+0x87/0x250
> [ 3515.830041] [<ffffffff8257f9dd>] ? printk+0x63/0x65
> [ 3515.830041] [<ffffffff8104eda2>] oops_end+0xc2/0x110
> [ 3515.830041] [<ffffffff8107cb92>] no_context+0x122/0x2e0
> [ 3515.830041] [<ffffffff8107ce7d>] __bad_area_nosemaphore+0x12d/0x230
> [ 3515.830041] [<ffffffff8107cf8e>] bad_area_nosemaphore+0xe/0x10
> [ 3515.830041] [<ffffffff8107dc0f>] do_page_fault+0x41f/0x4d0
> [ 3515.830041] [<ffffffff8117081e>] ? __alloc_pages_nodemask+0x14e/0x910
> [ 3515.830041] [<ffffffff81076d11>] do_async_page_fault+0x31/0x90
> [ 3515.830041] [<ffffffff82584055>] async_page_fault+0x25/0x30
> [ 3515.830041] [<ffffffff81077281>] ? native_set_pte+0x1/0x10
> [ 3515.830041] [<ffffffff81071d06>] ? machine_kexec_prepare+0x636/0x820
> [ 3515.830041] [<ffffffff8111bb68>] ? sys_kexec_load+0x98/0x590
> [ 3515.830041] [<ffffffff8111bbd2>] sys_kexec_load+0x102/0x590
> [ 3515.830041] [<ffffffff82583d5d>] ? retint_swapgs+0x13/0x1b
> [ 3515.830041] [<ffffffff8183c29e>] ? trace_hardirqs_on_thunk+0x3a/0x3f
> [ 3515.830041] [<ffffffff82584639>] system_call_fastpath+0x16/0x1b
> [ 3515.830041] [<ffffffff81001001>] ? hypercall_page+0x1/0x1000
next prev parent reply other threads:[~2012-01-22 4:47 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-01-22 6:06 BUG: unable to handle kernel paging request at ffffc7ff81000398 (sys_kexec_load) Sasha Levin
2012-01-22 6:06 ` Sasha Levin
2012-01-22 4:49 ` Eric W. Biederman [this message]
2012-01-22 4:49 ` Eric W. Biederman
2012-01-22 7:18 ` Sasha Levin
2012-01-22 7:18 ` Sasha Levin
2012-01-28 15:11 ` Sasha Levin
2012-01-28 15:11 ` Sasha Levin
2012-01-28 20:54 ` Eric W. Biederman
2012-01-28 20:54 ` Eric W. Biederman
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=m1lip0s5nt.fsf@fess.ebiederm.org \
--to=ebiederm@xmission.com \
--cc=davej@redhat.com \
--cc=kexec@lists.infradead.org \
--cc=levinsasha928@gmail.com \
--cc=linux-kernel@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.