Re: [BUG] machine check Oops on Alpha

From: Bob Tracy
Date: Tue Apr 19 2016 - 19:57:04 EST

On Mon, Apr 18, 2016 at 09:52:43PM -0500, Bob Tracy wrote:
> 4.6.0-rc4 build complete, including suggested (by Alan Young) "Verbose
> Machine Checks" option set to level 2 by default. System rebooted, and
> now we wait... Thanks for everyone's continued patience.

Within three minutes of rebooting, I got a machine check, but perhaps
significantly, no "Oops". I'm guessing the only reason I'm seeing the
ECC errors now (haven't seen them before) is because of the stepped-up
debug output. Syslog output attached...

Machine has been stable since the machine check. Kernel is 4.6.0-rc4.

--Bob
Apr 18 23:51:29 smirkin kernel: machine check: LA: fffffc0000006000
Apr 18 23:51:29 smirkin kernel: CIA machine check NOT expected!!!
Apr 18 23:51:29 smirkin kernel: CIA machine check: vector=0x630 pc=0xfffffc00005b66ac code=0x86
Apr 18 23:51:29 smirkin kernel: machine check type: correctable ECC error (retryable)
Apr 18 23:51:29 smirkin kernel: pc = [<fffffc00005b66ac>] ra = [<fffffc00003a5324>] ps = 0000 Not tainted
Apr 18 23:51:29 smirkin kernel: pc is at clear_page+0x3c/0xc4
Apr 18 23:51:29 smirkin kernel: ra is at get_page_from_freelist+0x524/0xa20
Apr 18 23:51:29 smirkin kernel: v0 = 0000000000000007 t0 = 6db6db6db6db6db7 t1 = fffffc0000000000
Apr 18 23:51:29 smirkin kernel: t2 = fffffc005c3786e0 t3 = fffffc0000d445f0 t4 = fffffc0000ad0a38
Apr 18 23:51:29 smirkin kernel: t5 = 00000000001fffff t6 = 00000000ffffffff t7 = fffffc005cf54000
Apr 18 23:51:29 smirkin kernel: a0 = fffffc00025ede40 a1 = 0000000000000000 a2 = 000000000000032e
Apr 18 23:51:29 smirkin kernel: a3 = fffffc0000c83a50 a4 = 0000000000000000 a5 = 0000000000000000
Apr 18 23:51:29 smirkin kernel: t8 = fffffc0000ad0aa0 t9 = fffffc0000ad0aa0 t10= fffffc0000d44608
Apr 18 23:51:29 smirkin kernel: t11= 0000000000000000 pv = fffffc00005b6670 at = 0000000000000400
Apr 18 23:51:29 smirkin kernel: gp = fffffc0000cb0aa0 sp = fffffc005cf57ba0
Apr 18 23:51:29 smirkin kernel: + 0 8000000000000068 0000003800000018
Apr 18 23:51:29 smirkin kernel: + 10 0000000000000086 ffffff00025edddf
Apr 18 23:51:29 smirkin kernel: + 20 0000000000005700 fffffff0c5ffffff
Apr 18 23:51:29 smirkin kernel: + 30 0000000100000000 0000000000000000
Apr 18 23:51:29 smirkin kernel: + 40 0000000000000000 0000000000000000
Apr 18 23:51:29 smirkin kernel: + 50 0000000000000000 0000000000000000
Apr 18 23:51:29 smirkin kernel: + 60 0000000000000000 00000000000002c0
Apr 18 23:51:30 smirkin kernel: machine check: LA: fffffc0000006000
Apr 18 23:51:30 smirkin kernel: CIA machine check NOT expected!!!
Apr 18 23:51:30 smirkin kernel: CIA machine check: vector=0x630 pc=0x1200124c8 code=0x86
Apr 18 23:51:30 smirkin kernel: machine check type: correctable ECC error (retryable)
Apr 18 23:51:30 smirkin kernel: pc = [<00000001200124c8>] ra = [<0000000120012480>] ps = 0008 Not tainted
Apr 18 23:51:30 smirkin kernel: pc is at 0x1200124c8
Apr 18 23:51:30 smirkin kernel: ra is at 0x120012480
Apr 18 23:51:30 smirkin kernel: v0 = 0000000120a51c90 t0 = 0000000000000000 t1 = 0000000000000001
Apr 18 23:51:30 smirkin kernel: t2 = 0000000120a530f0 t3 = 0000000120255638 t4 = 0000000000000000
Apr 18 23:51:30 smirkin kernel: t5 = 0000000120255620 t6 = 0000000000000001 t7 = 0000000000000020
Apr 18 23:51:30 smirkin kernel: a0 = 0000000120a51d40 a1 = 0000000000000000 a2 = 0000000000000008
Apr 18 23:51:30 smirkin kernel: a3 = 0000020000038010 a4 = 0000000000000000 a5 = 000000000000003e
Apr 18 23:51:30 smirkin kernel: t8 = 0000000000000001 t9 = 1999999999999999 t10= 0000000000000000
Apr 18 23:51:30 smirkin kernel: t11= 0000000000000001 pv = 0000000000000000 at = 0000000000000400
Apr 18 23:51:30 smirkin kernel: gp = 00000001200440f0 sp = fffffc005cf58000
Apr 18 23:51:30 smirkin kernel: + 0 8000000000000068 0000003800000018
Apr 18 23:51:30 smirkin kernel: + 10 0000000000000086 ffffff00025edddf
Apr 18 23:51:30 smirkin kernel: + 20 0000000000005700 fffffff0c5ffffff
Apr 18 23:51:30 smirkin kernel: + 30 0000000100000000 0000000000000000
Apr 18 23:51:30 smirkin kernel: + 40 0000000000000000 0000000000000000
Apr 18 23:51:30 smirkin kernel: + 50 0000000000000000 0000000000000000
Apr 18 23:51:30 smirkin kernel: + 60 0000000000000000 00000000000002c0
Apr 18 23:51:30 smirkin kernel: machine check: LA: fffffc0000006000
Apr 18 23:51:30 smirkin kernel: CIA machine check NOT expected!!!
Apr 18 23:51:30 smirkin kernel: CIA machine check: vector=0x630 pc=0x120007138 code=0x86
Apr 18 23:51:30 smirkin kernel: machine check type: correctable ECC error (retryable)
Apr 18 23:51:30 smirkin kernel: pc = [<0000000120007138>] ra = [<000000012001253c>] ps = 0008 Not tainted
Apr 18 23:51:30 smirkin kernel: pc is at 0x120007138
Apr 18 23:51:30 smirkin kernel: ra is at 0x12001253c
Apr 18 23:51:30 smirkin kernel: v0 = 0000000120a51c90 t0 = 0000000000000000 t1 = 0000000000000001
Apr 18 23:51:30 smirkin kernel: t2 = 0000000120a530f0 t3 = 0000000120255638 t4 = 0000000000000000
Apr 18 23:51:30 smirkin kernel: t5 = 0000000120255620 t6 = 0000000000000001 t7 = 0000000000000020
Apr 18 23:51:30 smirkin kernel: a0 = 0000000000000000 a1 = 0000000000000000 a2 = 0000000000000008
Apr 18 23:51:30 smirkin kernel: a3 = 0000020000038010 a4 = 0000000000000000 a5 = 000000000000003e
Apr 18 23:51:30 smirkin kernel: t8 = 0000000000000001 t9 = 1999999999999999 t10= 0000000000000000
Apr 18 23:51:30 smirkin kernel: t11= 0000000000000001 pv = 0000000000000000 at = 0000000000000400
Apr 18 23:51:30 smirkin kernel: gp = 00000001200440f0 sp = fffffc005cf58000
Apr 18 23:51:30 smirkin kernel: + 0 8000000000000068 0000003800000018
Apr 18 23:51:30 smirkin kernel: + 10 0000000000000086 ffffff00025edddf
Apr 18 23:51:30 smirkin kernel: + 20 0000000000005700 fffffff0c5ffffff
Apr 18 23:51:30 smirkin kernel: + 30 0000000100000000 0000000000000000
Apr 18 23:51:30 smirkin kernel: + 40 0000000000000000 0000000000000000
Apr 18 23:51:30 smirkin kernel: + 50 0000000000000000 0000000000000000
Apr 18 23:51:30 smirkin kernel: + 60 0000000000000000 00000000000002c0