From: Chuck Ebbert <cebbert.lkml@gmail.com>
To: linux-kernel@vger.kernel.org
Cc: x86@kernel.org, Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, "H. Peter Anvin" <hpa@zytor.com>
Subject: [BUG 4.2-rc8] Interrupt occurs while apply_alternatives() is patching the handler
Date: Sun, 30 Aug 2015 22:37:57 -0400 [thread overview]
Message-ID: <20150830223757.6e4c5c02@as> (raw)
This is from https://bugzilla.redhat.com/show_bug.cgi?id=1258223
[ 0.036000] BUG: unable to handle kernel paging request at 55501e06
[ 0.036000] IP: [<c0aae48b>] common_interrupt+0xb/0x38
[ 0.036000] *pde = 00000000
[ 0.036000] Oops: 0000 [#1] SMP
[ 0.036000] Modules linked in:
[ 0.036000] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.2.0-0.rc8.git3.1.fc24.i686 #1
[ 0.036000] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.8.2-20150714_191134- 04/01/2014
[ 0.036000] task: c0d49ac0 ti: c0d42000 task.ti: c0d42000
[ 0.036000] EIP: 0060:[<c0aae48b>] EFLAGS: 00200046 CPU: 0
[ 0.036000] EIP is at common_interrupt+0xb/0x38
[ 0.036000] EAX: c0aae480 EBX: 0000008d ECX: c0ab1c83 EDX: e4af6810
[ 0.036000] ESI: 029a7802 EDI: 00000003 EBP: c0d43e68 ESP: c0d43e44
[ 0.036000] DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068
[ 0.036000] CR0: 8005003b CR2: 55501e06 CR3: 00ebd000 CR4: 00000690
[ 0.036000] DR0: 00000000 DR1: 00000000 DR2: 00000000 DR3: 00000000
[ 0.036000] DR6: 00000000 DR7: 00000000
[ 0.036000] Stack:
[ 0.036000] 0000004f c0409c80 00000060 00200202 00200046 c0d43e60 c0ea150c 029a7802
[ 0.036000] 00000000 c0d43fb8 c040a054 c07f1cf0 6c0a1000 ffff0006 00200046 00000043
[ 0.036000] c0ed0bc0 00000000 c0d43e98 c071a6fc c0d43ea8 c0d43ec4 c0ea4c73 c0ea4c7f
[ 0.036000] Call Trace:
[ 0.036000] [<c0409c80>] ? add_nops+0x90/0xa0
[ 0.036000] [<c040a054>] apply_alternatives+0x274/0x630
[ 0.036000] [<c07f1cf0>] ? wait_for_xmitr+0xa0/0xa0
[ 0.036000] [<c071a6fc>] ? sprintf+0x1c/0x20
[ 0.036000] [<c0aae480>] ? irq_entries_start+0x698/0x698
[ 0.036000] [<c071be4b>] ? memcpy+0xb/0x30
[ 0.036000] [<c07f3950>] ? serial8250_set_termios+0x20/0x20
[ 0.036000] [<c0aad4e3>] ? _raw_write_unlock_irqrestore+0x13/0x20
[ 0.036000] [<c0aad4e3>] ? _raw_write_unlock_irqrestore+0x13/0x20
[ 0.036000] [<c0aad4fd>] ? _raw_spin_unlock_irqrestore+0xd/0x10
[ 0.036000] [<c04b17b9>] ? console_unlock+0x2e9/0x610
[ 0.036000] [<c04b03cd>] ? log_store+0x1cd/0x210
[ 0.036000] [<c04b1d7e>] ? vprintk_emit+0x29e/0x570
[ 0.036000] [<c04b21e1>] ? vprintk_default+0x41/0x60
[ 0.036000] [<c0aa7725>] ? printk+0x17/0x19
[ 0.036000] [<c0dfdd48>] ? identify_boot_cpu+0x7b/0x80
[ 0.036000] [<c0dfca47>] alternative_instructions+0x17/0xc1
[ 0.036000] [<c0dfdda9>] check_bugs+0x32/0x39
[ 0.036000] [<c0df6b57>] start_kernel+0x3ca/0x40a
[ 0.036000] [<c0df62e3>] i386_start_kernel+0x91/0x95
[ 0.036000] Code: 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 8d 90 90 83 04 24 80 fc 0f a8 0f <a0> 06 1e 50 55 57 56 52 51 53 ba 7b 00 00 00 8e da 8e c2 ba d8
0: 8d 90 90 83 04 24 lea 0x24048390(%eax),%edx
6: 80 fc 0f cmp $0xf,%ah
9: a8 0f test $0xf,%al
>> b: a0 06 1e 50 55 mov 0x55501e06,%al
10: 57 push %edi
11: 56 push %esi
Interrupt 0x30 occurred while the alternatives code was replacing the
initial 0x90,0x90,0x90 NOPs (from the ASM_CLAC macro) with the optimized
version, 0x8d,0x76,0x00. Only the first byte has been replaced so far,
and it makes a mess out of the insn decoding.
I have no clue how to fix this.
next reply other threads:[~2015-08-31 2:38 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-08-31 2:37 Chuck Ebbert [this message]
2015-09-01 6:20 ` [BUG 4.2-rc8] Interrupt occurs while apply_alternatives() is patching the handler Richard W.M. Jones
2015-09-02 9:11 ` Thomas Gleixner
2015-09-02 19:05 ` Richard W.M. Jones
2015-09-03 7:53 ` Richard W.M. Jones
2015-09-03 8:50 ` Borislav Petkov
2015-09-03 10:41 ` Thomas Gleixner
2015-09-03 12:43 ` Josh Boyer
2015-09-03 13:01 ` Thomas Gleixner
2015-09-03 15:48 ` Richard W.M. Jones
2015-09-03 19:30 ` [tip:x86/urgent] x86/alternatives: Make optimize_nops() interrupt safe and synced tip-bot for Thomas Gleixner
2015-09-04 7:40 ` [BUG 4.2-rc8] Interrupt occurs while apply_alternatives() is patching the handler Richard W.M. Jones
2015-09-04 12:02 ` Borislav Petkov
2015-09-04 13:37 ` Thomas Gleixner
2015-09-05 15:25 ` Borislav Petkov
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