Hi Stuart, thanks for having a look at this.
> Is it the same or different hardware type and BIOS version for the > working and hanging machines? (maybe diff the two dmesgs) > > Same or different filesystem mount options? (Are you using softdep?) it's (nearly) the same hardware. But thanks to your hint of diffing the dmesg outputs I found a small difference : * server1: bios0 at mainbus0: SMBIOS rev. 2.8 @ 0xec200 (78 entries) bios0: vendor American Megatrends Inc. version "4.6.5" date 03/02/2015 bios0: INTEL Corporation DENLOW_WS * server2: bios0 at mainbus0: SMBIOS rev. 2.8 @ 0xec200 (77 entries) bios0: vendor American Megatrends Inc. version "4.6.5" date 03/02/2015 bios0: INTEL Corporation DENLOW_WS * server2 has an additional entry, I do not see on server1 acpipci0 at acpi0 PCI0: 0x00000010 0x00000011 0x00000000 * server2 also seems to have a slightly different memory setup : spdmem0 at iic0 addr 0x50: 8GB DDR3 SDRAM PC3-12800 * whereas server1 has : spdmem0 at iic0 addr 0x50: 4GB DDR3 SDRAM PC3-12800 spdmem1 at iic0 addr 0x52: 4GB DDR3 SDRAM PC3-12800 On the filesystem I can't see any differences : * server1: $ mount /dev/sd0d on / type ffs (local, noatime, nodev, read-only) mfs:14405 on /tmp type mfs (asynchronous, local, noatime, nodev, nosuid, size=65536 512-blocks) mfs:35803 on /dev type mfs (asynchronous, local, noatime, noexec, size=12288 512-blocks) mfs:30894 on /etc type mfs (asynchronous, local, noatime, nodev, nosuid, size=65536 512-blocks) mfs:75826 on /var type mfs (asynchronous, local, noatime, nodev, noexec, size=131072 512-blocks) mfs:23894 on /usr/lib type mfs (asynchronous, local, noatime, nodev, nosuid, size=262144 512-blocks) mfs:21714 on /usr/libexec type mfs (asynchronous, local, noatime, nodev, size=262144 512-blocks) $ cat /etc/fstab dd6727251088320b.a /mbr ffs rw,noatime,nodev,noexec,noauto 1 2 dd6727251088320b.d / ffs ro,noatime,nodev 1 1 dd6727251088320b.f /cfg ffs rw,noatime,nodev,noexec,noauto 1 2 dd6727251088320b.i /efi msdos rw,noatime,nodev,noexec,noauto 0 0 swap /tmp mfs rw,async,noatime,nodev,nosuid,-s32M 0 0 $ * server2: $ mount /dev/sd0e on / type ffs (local, noatime, nodev, read-only) mfs:19530 on /tmp type mfs (asynchronous, local, noatime, nodev, nosuid, size=65536 512-blocks) mfs:65784 on /dev type mfs (asynchronous, local, noatime, noexec, size=12288 512-blocks) mfs:41465 on /etc type mfs (asynchronous, local, noatime, nodev, nosuid, size=65536 512-blocks) mfs:86708 on /var type mfs (asynchronous, local, noatime, nodev, noexec, size=262144 512-blocks) mfs:90223 on /usr/lib type mfs (asynchronous, local, noatime, nodev, nosuid, size=262144 512-blocks) mfs:22430 on /usr/libexec type mfs (asynchronous, local, noatime, nodev, size=262144 512-blocks) $ cat /etc/fstab 9f97b8d42ceedbf4.a /mbr ffs rw,noatime,nodev,noexec,noauto 1 2 9f97b8d42ceedbf4.e / ffs ro,noatime,nodev 1 1 9f97b8d42ceedbf4.f /cfg ffs rw,noatime,nodev,noexec,noauto 1 2 9f97b8d42ceedbf4.i /efi msdos rw,noatime,nodev,noexec,noauto 0 0 swap /tmp mfs rw,async,noatime,nodev,nosuid,-s32M 0 0 $ For the other suggestions, let me run the system with " sysctl ddb.console=1" and wait until the problem will occur to answer your questions as soon I have the additional information. Cheers, Marco
