[Lustre-discuss] mdt threads "hanging" (?) until writes no longer permitted

[Brian J. Murrell]

On Fri, 2009-12-11 at 11:51 -0600, Hendelman, Rob wrote: 
> BUG: soft lockup - CPU#1 stuck for 10s! [ll_evictor:3245]
> CPU 1:
> Modules linked in: sunrpc(U) ipv6(U) xfrm_nalgo(U) crypto_api(U) autofs4(U) hidp(U) l2cap(U) bluetooth(U) osc(U) lov(U) mds(U) lquota(U) fsfilt_ldiskfs(U) mgs(U) mgc(U) ptlrpc(U) l
> diskfs(U) crc16(U) ksocklnd(U) obdclass(U) lnet(U) lvfs(U) libcfs(U) dm_multipath(U) video(U) sbs(U) backlight(U) i2c_ec(U) i2c_core(U) button(U) battery(U) asus_acpi(U) acpi_memho
> tplug(U) ac(U) parport_pc(U) lp(U) parport(U) pcspkr(U) hpwdt(U) serio_raw(U) bnx2(U) shpchp(U) dm_snapshot(U) dm_zero(U) dm_mirror(U) dm_mod(U) usb_storage(U) lpfc(U) scsi_transpo
> rt_fc(U) cciss(U) sd_mod(U) scsi_mod(U) ext3(U) jbd(U) ehci_hcd(U) ohci_hcd(U) uhci_hcd(U)
> Pid: 3245, comm: ll_evictor Tainted: G      2.6.18-92.1.26.el5_lustre.1.6.7.2smp #1
> RIP: 0010:[<ffffffff800649e6>]  [<ffffffff800649e6>] _write_lock+0x7/0xf
> RSP: 0018:ffff810493d89d68  EFLAGS: 00000246
> RAX: ffff8103b4900c00 RBX: 000000000000c5e0 RCX: 00000000000120e6
> RDX: 000000000000037e RSI: ffffffff802f1d80 RDI: ffffc20010861e0c
> RBP: 0000000000000282 R08: ffff8104afcb3360 R09: 0000000000000000
> R10: ffff8103b49ed840 R11: 0000000000000150 R12: 0000000000000282
> R13: ffff810493d89d10 R14: ffff8103b49ed898 R15: ffff8103b49ed840
> FS:  00002b4db7ec2230(0000) GS:ffff8104a007ac40(0000) knlGS:0000000000000000
> CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
> CR2: 00002ab671c5d0a0 CR3: 000000091d857000 CR4: 00000000000006e0
> 
> Call Trace:
>  [<ffffffff883593fe>] :obdclass:lustre_hash_for_each_empty+0x20e/0x290

This looks like bug 19557 with patches landed for 1.8.2 already and work
still ongoing on making lustre_hash_for_each_empty() more efficient.

b.

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