I've not seen this one, but looking around a bit, I am wondering if the
code path hit a denormal underflow in a SIMD instruction, and didn't
have the appropriate SIMD exception mask. See
https://software.intel.com/en-us/articles/x87-and-sse-floating-point-assists-in-ia-32-flush-to-zero-ftz-and-denormals-are-zero-daz
for info.
Basically, if there is a SIMD exception, and the exception isn't masked
off with an FTZ or similar, or an exception interrupt handler
registered, it could wind up somewhere like this.
If you have dumps from the crash, you could load them up in the
debugger. Would be the most accurate route to determine why that was
triggered.
On 09/09/2018 09:04 PM, Christopher Samuel wrote:
Hi folks,
We've had 2 different nodes crash over the past few days with kernel
panics triggered by (what is recorded as) a "simd exception" (console
messages below). In both cases the triggering application is given as
the same binary, a user application built against OpenFOAM v16.06.
This doesn't happen every time, I can see about 28 successful runs of
the application this month (the binary was built at the end of August).
The system in question has 2 x 16C Xeon Gold 6140 Skylake-EP CPUs.
Any ideas?
------------------8< snip snip 8<------------------
2018-09-09 17:14:34 [179203.697285] simd exception: 0000 [#1] SMP
2018-09-09 17:14:34 [179203.701527] Modules linked in: squashfs loop
8021q garp mrp stp llc nvidia_uvm(POE) nvidia(POE) xfs skx_edac
intel_powerclamp coretemp intel_rapl iosf_mbi irqbypass crc32_pclmul
ghash_clmulni_intel iTCO_wdt iTCO_vendor_support rdma_ucm ib_ucm
dcdbas aesni_intel mgag200 lrw gf128mul glue_helper ablk_helper ttm
ib_uverbs cryptd drm_kms_helper dm_mod syscopyarea sysfillrect ib_umad
sysimgblt fb_sys_fops drm mei_me sg ipmi_si mei lpc_ich i2c_i801
shpchp nfit ipmi_devintf ipmi_msghandler libnvdimm tpm_crb acpi_pad
acpi_power_meter binfmt_misc overlay(OET) osc(OE) mgc(OE) lustre(OE)
lmv(OE) fld(OE) mdc(OE) fid(OE) lov(OE) ko2iblnd(OE) rdma_cm iw_cm
ptlrpc(OE) obdclass(OE) lnet(OE) libcfs(OE) ib_ipoib ib_cm sr_mod
cdrom sd_mod crc_t10dif crct10dif_generic hfi1 rdmavt i2c_algo_bit
i2c_core ahci crct10dif_pclmul crct10dif_common crc32c_intel libahci
ib_core libata megaraid_sas pps_core libcrc32c [last unloaded: pcspkr]
2018-09-09 17:14:34 [179203.784359] CPU: 2 PID: 159455 Comm:
shuangTwoPhaseE Tainted: P OE ------------ T
3.10.0-862.9.1.el7.x86_64 #1
2018-09-09 17:14:34 [179203.795389] Hardware name: Dell Inc. PowerEdge
R740/06G98X, BIOS 1.4.8 05/21/2018
2018-09-09 17:14:34 [179203.802958] task: ffff995c1aee8fd0 ti:
ffff995c1988c000 task.ti: ffff995c1988c000
2018-09-09 17:14:34 [179203.810539] RIP: 0010:[<ffffffffbe121791>]
[<ffffffffbe121791>] apic_timer_interrupt+0x141/0x170
2018-09-09 17:14:34 [179203.819515] RSP: 0000:ffff995c1da46200 EFLAGS:
00010082
2018-09-09 17:14:34 [179203.824928] RAX: ffff995c1988ff70 RBX:
0000000001a95e00 RCX: 0000000000000090
2018-09-09 17:14:34 [179203.832146] RDX: 0000000000000000 RSI:
ffff995c1da46200 RDI: ffff995c1988ff70
2018-09-09 17:14:34 [179203.839364] RBP: 00007ffd8b8ba848 R08:
0000000000000c40 R09: 0000000000000031
2018-09-09 17:14:34 [179203.846591] R10: 0000000000000000 R11:
0000000000e72148 R12: 0000000001c4e770
2018-09-09 17:14:34 [179203.853827] R13: 0000000000000007 R14:
00000000011935b0 R15: 0000000000000038
2018-09-09 17:14:34 [179203.861040] FS: 00002ad83f7afa00(0000)
GS:ffff995c1da40000(0000) knlGS:0000000000000000
2018-09-09 17:14:34 [179203.869213] CS: 0010 DS: 0000 ES: 0000 CR0:
0000000080050033
2018-09-09 17:14:34 [179203.875042] CR2: 0000000002a18000 CR3:
00000017963f8000 CR4: 00000000007607e0
2018-09-09 17:14:34 [179203.882274] DR0: 0000000000000000 DR1:
0000000000000000 DR2: 0000000000000000
2018-09-09 17:14:34 [179203.889495] DR3: 0000000000000000 DR6:
00000000fffe0ff0 DR7: 0000000000000400
2018-09-09 17:14:34 [179203.896714] PKRU: 55555554
2018-09-09 17:14:34 [179203.899530] Call Trace:
2018-09-09 17:14:34 [179203.902065] Code: 48 39 cc 77 2f 48 8d 81 00
fe ff ff 48 39 e0 77 23 57 48 29 e1 65 48 8b 3c 25 78 0e 01 00 48 83
c7 28 48 29 cf 48 89 f8 48 89 e6 <f3> a4 48 89 c4 5f 48 89 e6 65 ff 04
25 60 0e 01 00 65 48 0f 44
2018-09-09 17:14:34 [179203.922628] RIP [<ffffffffbe121791>]
apic_timer_interrupt+0x141/0x170
2018-09-09 17:14:34 [179203.929259] RSP <ffff995c1da46200>
2018-09-09 17:14:34 [179203.933970] ---[ end trace 3912e5e8b3b86da4 ]---
2018-09-09 17:14:34 [179203.984039] Kernel panic - not syncing: Fatal
exception
2018-09-09 17:14:34 [179203.989451] Kernel Offset: 0x3ca00000 from
0xffffffff81000000 (relocation range:
0xffffffff80000000-0xffffffffbfffffff)
------------------8< snip snip 8<------------------
------------------8< snip snip 8<------------------
2018-09-07 22:37:16 [201527.171417] simd exception: 0000 [#1] SMP
2018-09-07 22:37:16 [201527.176270] Modules linked in: squashfs loop
8021q garp mrp stp llc nvidia_uvm(POE) nvidia(POE) xfs skx_edac
intel_powerclamp coretemp intel_rapl iosf_mbi mgag200 ttm
drm_kms_helper irqbypass syscopyarea sysfillrect crc32_pclmul
sysimgblt iTCO_wdt fb_sys_fops ib_ucm iTCO_vendor_support
ghash_clmulni_intel rdma_ucm dm_mod dcdbas drm ib_uverbs aesni_intel
lrw gf128mul glue_helper ablk_helper cryptd mei_me sg lpc_ich i2c_i801
shpchp ib_umad mei ipmi_si ipmi_devintf ipmi_msghandler nfit libnvdimm
tpm_crb acpi_pad acpi_power_meter binfmt_misc overlay(OET) osc(OE)
mgc(OE) lustre(OE) lmv(OE) fld(OE) mdc(OE) fid(OE) lov(OE)
ko2iblnd(OE) rdma_cm iw_cm ptlrpc(OE) obdclass(OE) lnet(OE) libcfs(OE)
ib_ipoib ib_cm sd_mod sr_mod cdrom crc_t10dif crct10dif_generic hfi1
rdmavt i2c_algo_bit ahci i2c_core crct10dif_pclmul libahci
crct10dif_common crc32c_intel ib_core libata megaraid_sas pps_core
libcrc32c [last unloaded: pcspkr]
2018-09-07 22:37:16 [201527.264079] CPU: 17 PID: 32227 Comm:
shuangTwoPhaseE Tainted: P W OE ------------ T
3.10.0-862.9.1.el7.x86_64 #1
2018-09-07 22:37:16 [201527.275789] Hardware name: Dell Inc. PowerEdge
R740/06G98X, BIOS 1.4.8 05/21/2018
2018-09-07 22:37:16 [201527.284045] task: ffff9e345a42eeb0 ti:
ffff9e2f88a0c000 task.ti: ffff9e2f88a0c000
2018-09-07 22:37:16 [201527.292302] RIP: 0010:[<ffffffffa6721791>]
[<ffffffffa6721791>] apic_timer_interrupt+0x141/0x170
2018-09-07 22:37:16 [201527.301978] RSP: 0000:ffff9e345c006200 EFLAGS:
00010082
2018-09-07 22:37:16 [201527.308091] RAX: ffff9e2f88a0ff70 RBX:
00007fffe0d21d78 RCX: 0000000000000090
2018-09-07 22:37:16 [201527.316032] RDX: 0000000000000000 RSI:
ffff9e345c006200 RDI: ffff9e2f88a0ff70
2018-09-07 22:37:16 [201527.323969] RBP: 00007fffe0d21d78 R08:
000000000001e800 R09: 00000000000007a0
2018-09-07 22:37:16 [201527.331906] R10: 0000000000000000 R11:
0000000002818868 R12: 0000000002d20790
2018-09-07 22:37:16 [201527.339839] R13: 00007fffe0d159d0 R14:
00007fffe0d15b40 R15: 00007fffe0d15a20
2018-09-07 22:37:16 [201527.347772] FS: 00002b835d26da00(0000)
GS:ffff9e345c000000(0000) knlGS:0000000000000000
2018-09-07 22:37:16 [201527.356659] CS: 0010 DS: 0000 ES: 0000 CR0:
0000000080050033
2018-09-07 22:37:16 [201527.363209] CR2: 0000000003a6ff88 CR3:
0000002fdd8f6000 CR4: 00000000007607e0
2018-09-07 22:37:16 [201527.371144] DR0: 0000000000000000 DR1:
0000000000000000 DR2: 0000000000000000
2018-09-07 22:37:16 [201527.379079] DR3: 0000000000000000 DR6:
00000000fffe0ff0 DR7: 0000000000000400
2018-09-07 22:37:16 [201527.387010] PKRU: 55555554
2018-09-07 22:37:16 [201527.390523] Call Trace:
2018-09-07 22:37:16 [201527.393780] Code: 48 39 cc 77 2f 48 8d 81 00
fe ff ff 48 39 e0 77 23 57 48 29 e1 65 48 8b 3c 25 78 0e 01 00 48 83
c7 28 48 29 cf 48 89 f8 48 89 e6 <f3> a4 48 89 c4 5f 48 89 e6 65 ff 04
25 60 0e 01 00 65 48 0f 44
2018-09-07 22:37:16 [201527.415810] RIP [<ffffffffa6721791>]
apic_timer_interrupt+0x141/0x170
2018-09-07 22:37:16 [201527.423189] RSP <ffff9e345c006200>
2018-09-07 22:37:16 [201527.428646] ---[ end trace a6a14aed798e889f ]---
2018-09-07 22:37:17 [201527.477875] Kernel panic - not syncing: Fatal
exception
2018-09-07 22:37:17 [201527.484041] Kernel Offset: 0x25000000 from
0xffffffff81000000 (relocation range:
0xffffffff80000000-0xffffffffbfffffff)
------------------8< snip snip 8<------------------
All the best!
Chris
--
Joe Landman
e: joe.land...@gmail.com
t: @hpcjoe
w: https://scalability.org
g: https://github.com/joelandman
l: https://www.linkedin.com/in/joelandman
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