[ 6559.142453] LustreError: 18592:0:(osc_cache.c:1124:osc_extent_make_ready()) ASSERTION( last_oap_count > 0 ) failed:
[ 6559.142454] LustreError: 18592:0:(osc_cache.c:1124:osc_extent_make_ready()) LBUG
[ 6559.142456] Pid: 18592, comm: ptlrpcd_00_01 3.10.0-957.el7_lustre.x86_64 #1 SMP Fri Dec 21 21:49:33 UTC 2018
[ 6559.142456] Call Trace:
[ 6559.142477] [<ffffffffc0475e4c>] libcfs_call_trace+0x8c/0xc0 [libcfs]
[ 6559.142481] [<ffffffffc0475efc>] lbug_with_loc+0x4c/0xa0 [libcfs]
[ 6559.142490] [<ffffffffc0b6334c>] osc_extent_make_ready+0xb4c/0xe40 [osc]
[ 6559.142496] [<ffffffffc0b662eb>] osc_io_unplug0+0xe9b/0x18b0 [osc]
[ 6559.142501] [<ffffffffc0b3f773>] brw_queue_work+0x33/0xd0 [osc]
[ 6559.142537] [<ffffffffc08f27fa>] work_interpreter+0x3a/0xf0 [ptlrpc]
[ 6559.142561] [<ffffffffc08fb220>] ptlrpc_check_set+0x510/0x1ed0 [ptlrpc]
[ 6559.142587] [<ffffffffc0929e0b>] ptlrpcd_check+0x4ab/0x590 [ptlrpc]
[ 6559.142611] [<ffffffffc092a0a0>] ptlrpcd+0x1b0/0x6a0 [ptlrpc]
[ 6559.142614] [<ffffffff876c1c31>] kthread+0xd1/0xe0
[ 6559.142617] [<ffffffff87d74c37>] ret_from_fork_nospec_end+0x0/0x39
[ 6559.142631] [<ffffffffffffffff>] 0xffffffffffffffff
[ 6559.142631] Kernel panic - not syncing: LBUG
[ 6559.142634] CPU: 1 PID: 18592 Comm: ptlrpcd_00_01 Kdump: loaded Tainted: G OE ------------ 3.10.0-957.el7_lustre.x86_64 #1
[ 6559.142635] Hardware name: innotek GmbH VirtualBox/VirtualBox, BIOS VirtualBox 12/01/2006
[ 6559.142635] Call Trace:
[ 6559.142639] [<ffffffff87d61dc1>] dump_stack+0x19/0x1b
[ 6559.142641] [<ffffffff87d5b4d0>] panic+0xe8/0x21f
[ 6559.142646] [<ffffffffc0475f4b>] lbug_with_loc+0x9b/0xa0 [libcfs]
[ 6559.142653] [<ffffffffc0b6334c>] osc_extent_make_ready+0xb4c/0xe40 [osc]
[ 6559.142672] [<ffffffffc0b662eb>] osc_io_unplug0+0xe9b/0x18b0 [osc]
[ 6559.142677] [<ffffffffc0b3f773>] brw_queue_work+0x33/0xd0 [osc]
[ 6559.142699] [<ffffffffc08f27fa>] work_interpreter+0x3a/0xf0 [ptlrpc]
[ 6559.142721] [<ffffffffc08fb220>] ptlrpc_check_set+0x510/0x1ed0 [ptlrpc]
[ 6559.142746] [<ffffffffc0929e0b>] ptlrpcd_check+0x4ab/0x590 [ptlrpc]
[ 6559.142769] [<ffffffffc092a0a0>] ptlrpcd+0x1b0/0x6a0 [ptlrpc]
[ 6559.142772] [<ffffffff8762a59e>] ? __switch_to+0xce/0x580
[ 6559.142773] [<ffffffff876c2d00>] ? wake_up_atomic_t+0x30/0x30
[ 6559.142796] [<ffffffffc0929ef0>] ? ptlrpcd_check+0x590/0x590 [ptlrpc]
[ 6559.142798] [<ffffffff876c1c31>] kthread+0xd1/0xe0
[ 6559.142799] [<ffffffff876c1b60>] ? insert_kthread_work+0x40/0x40
[ 6559.142801] [<ffffffff87d74c37>] ret_from_fork_nospec_begin+0x21/0x21
[ 6559.142802] [<ffffffff876c1b60>] ? insert_kthread_work+0x40/0x40
This failure in the upstream client was due to the interval implementation we had with kms handling. It was fixed in the OpenSFS tree port and that has been back ported to the native Client. I do seem a very similar error but its not kms related.