[Lustre-discuss] kernel: BUG: soft lockup - CPU stuck for 10s! with lustre 1.8.4

Temple Jason jtemple at cscs.ch
Tue Sep 14 02:21:22 PDT 2010 

Hello,

I have recently upgraded my lustre filesystem from 1.8.3 to 1.8.4.  The first day we brought our system online with the new version, we started seeing clients getting stuck in this soft lockup loop.  The load shoots up over 120, and eventually the node becomes unusable and requires a hard reset.  I've seen loops like this on the server side in previous lustre versions, but to have it happen on the client is completely new.  Here is a bit of what I see in the logs:

Sep 13 21:11:39 wn122 kernel: LustreError: 27016:0:(statahead.c:289:ll_sai_entry_fini()) ASSERTION(sa_is_stopped(sai)) failed
Sep 13 21:11:39 wn122 kernel: LustreError: 27016:0:(statahead.c:289:ll_sai_entry_fini()) LBUG
Sep 13 21:11:39 wn122 kernel: Pid: 27016, comm: athena.py
Sep 13 21:11:39 wn122 kernel:
Sep 13 21:11:39 wn122 kernel: Call Trace:
Sep 13 21:11:39 wn122 kernel:  [<ffffffff885cf6a1>] libcfs_debug_dumpstack+0x51/0x60 [libcfs]
Sep 13 21:11:39 wn122 kernel:  [<ffffffff885cfbda>] lbug_with_loc+0x7a/0xd0 [libcfs]
Sep 13 21:11:39 wn122 kernel:  [<ffffffff885d7f00>] tracefile_init+0x0/0x110 [libcfs]
Sep 13 21:11:39 wn122 kernel:  [<ffffffff889247e9>] ll_statahead_exit+0x409/0x500 [lustre]
Sep 13 21:11:39 wn122 kernel:  [<ffffffff8008a4b4>] default_wake_function+0x0/0xe
Sep 13 21:11:39 wn122 kernel:  [<ffffffff888d2f2e>] ll_intent_drop_lock+0x8e/0xb0 [lustre]
Sep 13 21:11:39 wn122 kernel:  [<ffffffff8891c2bb>] ll_lookup_it+0x30b/0x7c0 [lustre]
Sep 13 21:11:39 wn122 kernel:  [<ffffffff888e250d>] __ll_inode_revalidate_it+0x5bd/0x650 [lustre]
Sep 13 21:11:39 wn122 kernel:  [<ffffffff886f34f4>] ldlm_lock_add_to_lru+0x74/0xe0 [ptlrpc]
Sep 13 21:11:39 wn122 kernel:  [<ffffffff88919431>] ll_convert_intent+0xb1/0x170 [lustre]
Sep 13 21:11:39 wn122 kernel:  [<ffffffff8891d4c7>] ll_lookup_nd+0x207/0x400 [lustre]
Sep 13 21:11:39 wn122 kernel:  [<ffffffff8002229b>] d_alloc+0x174/0x1a9
Sep 13 21:11:39 wn122 kernel:  [<ffffffff8000cc40>] do_lookup+0xe5/0x1e6
Sep 13 21:11:39 wn122 kernel:  [<ffffffff80009fce>] __link_path_walk+0xa01/0xf42
Sep 13 21:11:39 wn122 kernel:  [<ffffffff8000e803>] link_path_walk+0x5c/0xe5
Sep 13 21:11:39 wn122 kernel:  [<ffffffff80034cd4>] vfs_readdir+0x94/0xa9
Sep 13 21:11:39 wn122 kernel:  [<ffffffff800f4fa9>] compat_sys_getdents+0xaf/0xbd
Sep 13 21:11:39 wn122 kernel:  [<ffffffff8000c9df>] do_path_lookup+0x270/0x2e8
Sep 13 21:11:39 wn122 kernel:  [<ffffffff800123f7>] getname+0x15b/0x1c1
Sep 13 21:11:39 wn122 kernel:  [<ffffffff80023318>] __user_walk_fd+0x37/0x4c
Sep 13 21:11:39 wn122 kernel:  [<ffffffff800320b8>] sys_faccessat+0xe4/0x18d
Sep 13 21:11:39 wn122 kernel:  [<ffffffff80034cd4>] vfs_readdir+0x94/0xa9
Sep 13 21:11:39 wn122 kernel:  [<ffffffff800f4fa9>] compat_sys_getdents+0xaf/0xbd
Sep 13 21:11:39 wn122 kernel:  [<ffffffff8006149b>] sysenter_do_call+0x1b/0x67
Sep 13 21:11:39 wn122 kernel:  [<ffffffff8002c205>] dummy_inode_permission+0x0/0x3
Sep 13 21:11:39 wn122 kernel:
Sep 13 21:11:39 wn122 kernel: LustreError: dumping log to /tmp/lustre-log.1284405099.27016
Sep 13 21:11:44 wn122 dhclient: DHCPREQUEST on eth0 to 148.187.67.113 port 67
Sep 13 21:11:49 wn122 kernel: BUG: soft lockup - CPU#3 stuck for 10s! [ptlrpcd:31817]
Sep 13 21:11:49 wn122 kernel: CPU 3:
Sep 13 21:11:49 wn122 kernel: Modules linked in: mgc(U) lustre(U) lov(U) mdc(U) lquota(U) osc(U) ko2iblnd(U) ptlrpc(U) obdclass(U) lnet(U) lvfs(U) libcfs(U) nfs fscache nfs_acl loc
kd sunrpc bonding(U) ip_conntrack_netbios_ns ipt_REJECT xt_tcpudp xt_state iptable_filter iptable_nat ip_nat ip_conntrack nfnetlink iptable_mangle ip_tables x_tables rdma_ucm(U) ib
_sdp(U) rdma_cm(U) iw_cm(U) ib_addr(U) ib_ipoib(U) ipoib_helper(U) ib_cm(U) ipv6 xfrm_nalgo crypto_api ib_uverbs(U) ib_umad(U) mlx4_vnic(U) ib_sa(U) mlx4_ib(U) ib_mthca(U) ib_mad(U
) ib_core(U) dm_multipath scsi_dh video hwmon backlight sbs i2c_ec button battery asus_acpi acpi_memhotplug ac parport_pc lp parport joydev sg i2c_i801 i2c_core e1000e shpchp mlx4_
core(U) pcspkr dm_raid45 dm_message dm_region_hash dm_mem_cache dm_snapshot dm_zero dm_mirror dm_log dm_mod ata_piix libata sd_mod scsi_mod ext3 jbd uhci_hcd ohci_hcd ehci_hcd
Sep 13 21:11:49 wn122 kernel: Pid: 31817, comm: ptlrpcd Tainted: G      2.6.18-128.7.1.el5 #1
Sep 13 21:11:49 wn122 kernel: RIP: 0010:[<ffffffff80064cb7>]  [<ffffffff80064cb7>] .text.lock.spinlock+0x5/0x30
Sep 13 21:11:49 wn122 kernel: RSP: 0018:ffff8101ec177cb8  EFLAGS: 00000282
Sep 13 21:11:49 wn122 kernel: RAX: 000000000000004f RBX: 0000000000000000 RCX: 0000000000000000
Sep 13 21:11:49 wn122 kernel: RDX: ffff81035956b480 RSI: ffff810253c2d400 RDI: ffff810552ccb500
Sep 13 21:11:49 wn122 kernel: RBP: ffff810192294000 R08: 5a5a5a5a5a5a5a5a R09: 5a5a5a5a5a5a5a5a
Sep 13 21:11:49 wn122 kernel: R10: 5a5a5a5a5a5a5a5a R11: 5a5a5a5a5a5a5a5a R12: 0000000000000038
Sep 13 21:11:49 wn122 kernel: R13: ffff81045b0150c0 R14: ffff81067fc57000 R15: ffffffff886f5168
Sep 13 21:11:49 wn122 kernel: FS:  00002b5af649d240(0000) GS:ffff81010c4c8e40(0000) knlGS:0000000000000000
Sep 13 21:11:49 wn122 kernel: CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
Sep 13 21:11:49 wn122 kernel: CR2: 0000000008183094 CR3: 0000000000201000 CR4: 00000000000006e0
Sep 13 21:11:49 wn122 kernel:
Sep 13 21:11:49 wn122 kernel: Call Trace:
Sep 13 21:11:49 wn122 kernel:  [<ffffffff889249dc>] :lustre:ll_statahead_interpret+0xfc/0x5b0
Sep 13 21:11:49 wn122 kernel:  [<ffffffff88861779>] :mdc:mdc_intent_getattr_async_interpret+0x459/0x490
Sep 13 21:11:49 wn122 kernel:  [<ffffffff88729246>] :ptlrpc:ptlrpc_check_set+0x1186/0x1440
Sep 13 21:11:49 wn122 kernel:  [<ffffffff8004ac1b>] try_to_del_timer_sync+0x51/0x5a
Sep 13 21:11:49 wn122 kernel:  [<ffffffff8875d05d>] :ptlrpc:ptlrpcd_check+0xdd/0x1f0
Sep 13 21:11:49 wn122 kernel:  [<ffffffff80095004>] process_timeout+0x0/0x5
Sep 13 21:11:49 wn122 kernel:  [<ffffffff8875d9a1>] :ptlrpc:ptlrpcd+0x1b1/0x259
Sep 13 21:11:49 wn122 kernel:  [<ffffffff8008a4b4>] default_wake_function+0x0/0xe
Sep 13 21:11:49 wn122 kernel:  [<ffffffff8005dfb1>] child_rip+0xa/0x11
Sep 13 21:11:49 wn122 kernel:  [<ffffffff8875d7f0>] :ptlrpc:ptlrpcd+0x0/0x259
Sep 13 21:11:49 wn122 kernel:  [<ffffffff8005dfa7>] child_rip+0x0/0x11
Sep 13 21:11:49 wn122 kernel:
Sep 13 21:11:49 wn122 kernel: BUG: soft lockup - CPU#0 stuck for 10s! [ll_sa_27016:28593]
Sep 13 21:11:49 wn122 kernel: CPU 0:
Sep 13 21:11:49 wn122 kernel: Modules linked in: mgc(U) lustre(U) lov(U) mdc(U) lquota(U) osc(U) ko2iblnd(U) ptlrpc(U) obdclass(U) lnet(U) lvfs(U) libcfs(U) nfs fscache nfs_acl lockd sunrpc bonding(U) ip_conntrack_netbios_ns ipt_REJECT xt_tcpudp xt_state iptable_filter iptable_nat ip_nat ip_conntrack nfnetlink iptable_mangle ip_tables x_tables rdma_ucm(U) ib_sdp(U) rdma_cm(U) iw_cm(U) ib_addr(U) ib_ipoib(U) ipoib_helper(U) ib_cm(U) ipv6 xfrm_nalgo crypto_api ib_uverbs(U) ib_umad(U) mlx4_vnic(U) ib_sa(U) mlx4_ib(U) ib_mthca(U) ib_mad(U) ib_core(U) dm_multipath scsi_dh video hwmon backlight sbs i2c_ec button battery asus_acpi acpi_memhotplug ac parport_pc lp parport joydev sg i2c_i801 i2c_core e1000e shpchp mlx4_core(U) pcspkr dm_raid45 dm_message dm_region_hash dm_mem_cache dm_snapshot dm_zero dm_mirror dm_log dm_mod ata_piix libata sd_mod scsi_mod ext3 jbd uhci_hcd ohci_hcd ehci_hcd
Sep 13 21:11:49 wn122 kernel: Pid: 28593, comm: ll_sa_27016 Tainted: G      2.6.18-128.7.1.el5 #1
Sep 13 21:11:49 wn122 kernel: RIP: 0010:[<ffffffff80064cb4>]  [<ffffffff80064cb4>] .text.lock.spinlock+0x2/0x30
Sep 13 21:11:49 wn122 kernel: RSP: 0000:ffff810251edfcf8  EFLAGS: 00000282
Sep 13 21:11:49 wn122 kernel: RAX: 0000000000000001 RBX: ffff8101cf193e80 RCX: 0000000000000000
Sep 13 21:11:49 wn122 kernel: RDX: 0000000000000012 RSI: 000000000abe79b0 RDI: ffff810552ccb500
Sep 13 21:11:49 wn122 kernel: RBP: 0000000000000286 R08: 0000000351edfde0 R09: 0000000000000000
Sep 13 21:11:49 wn122 kernel: R10: ffff810311d9a400 R11: 0000000000000248 R12: ffff81023f907a00
Sep 13 21:11:49 wn122 kernel: R13: ffffffff88726dba R14: ffff810162543bc0 R15: 0000000000000000
Sep 13 21:11:49 wn122 kernel: FS:  0000000000000000(0000) GS:ffffffff803ac000(0000) knlGS:0000000000000000
Sep 13 21:11:49 wn122 kernel: CS:  0010 DS: 002b ES: 002b CR0: 000000008005003b
Sep 13 21:11:49 wn122 kernel: CR2: 000000000c0f900c CR3: 000000066b863000 CR4: 00000000000006e0
Sep 13 21:11:49 wn122 kernel:
Sep 13 21:11:49 wn122 kernel: Call Trace:
Sep 13 21:11:49 wn122 kernel:  [<ffffffff88923787>] :lustre:ll_sai_entry_to_stated+0x87/0x330
Sep 13 21:11:49 wn122 kernel:  [<ffffffff8000d0de>] dput+0x2c/0x114
Sep 13 21:11:49 wn122 kernel:  [<ffffffff88923f8b>] :lustre:do_statahead_interpret+0x55b/0x5c0
Sep 13 21:11:49 wn122 kernel:  [<ffffffff88925641>] :lustre:ll_statahead_thread+0x7b1/0x1750
Sep 13 21:11:49 wn122 kernel:  [<ffffffff8008a4b4>] default_wake_function+0x0/0xe
Sep 13 21:11:49 wn122 kernel:  [<ffffffff8005dfb1>] child_rip+0xa/0x11
Sep 13 21:11:49 wn122 kernel:  [<ffffffff88924e90>] :lustre:ll_statahead_thread+0x0/0x1750
Sep 13 21:11:49 wn122 kernel:  [<ffffffff8005dfa7>] child_rip+0x0/0x11

After we had 3 clients go into this state the first day, and 2 the next, we decided to downgrade the clients back to 1.8.3, while leaving the servers at 1.8.4.  This morning, we had 2 more clients get stuck again, so my assumption is that there is a problem with the 1.8.4 servers.

These are RedHat 5.4 servers and clients, with the 2.6.18-194.3.1.el5_lustre.1.8.4 kernel.

Any help on this issue would be great.

Thanks,

Jason Temple
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