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Date:   Mon, 20 Feb 2017 12:58:02 -0800
From:   "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:     Sumit Gemini <sumit.gemini0@...il.com>
Cc:     ralf.hildebrandt@...rite.de, linux-kernel@...r.kernel.org
Subject: Re: Need your help on rcu_bh_state stall on CPU 0 (t=0 jiffies)

On Mon, Feb 20, 2017 at 03:26:32PM +0530, Sumit Gemini wrote:
> Hi Paul,
> 
> 
> I got you while reading 'http://www.serverphorums.com/read.php?12,468996". I'm
> facing same problem but not able to detect what exectly the cause of
> it.
> 
> 
> I'm observed weird problem, I got rcu_bh_state on cpu0 but my system
> was in ideal state when i got rcu_bh_state (Cpu stall) problem. After
> 7 second my system recovered itself from stall to active. But i did
> not get what happen at that time.

One thing that you might look into below...

> Jan 6 16:45:06 ffm-sbc-2a kernel: [3167216.520060] INFO: rcu_bh_state detected stall on CPU 0 (t=0 jiffies)
> Jan 6 16:45:06 ffm-sbc-2a kernel: [3167216.524042] sending NMI to all CPUs:
> Jan 6 16:45:06 ffm-sbc-2a kernel: [3167216.524042] NMI backtrace for cpu 0
> Jan 6 16:45:06 ffm-sbc-2a kernel: [3167216.524042] CPU 0
> Jan 6 16:45:06 ffm-sbc-2a kernel: [3167216.524042] Modules linked in: nf_conntrack_netlink af_packet xt_sharedlimit xt_hashlimit ip_set_hash_ipport ip_set_hash_ipportip xt_NOTRACK ip_set_bitmap_port xt_sctp nf_conntrack_ipv6 nf_defrag_ipv6 xt_CT arpt_mangle ip_set_hash_ipnet xt_NFLOG nfnetlink_log ipt_ULOG xt_limit xt_hashcounter ip_set_hash_ipip xt_set ip_set_hash_ip deflate zlib_deflate ctr twofish_x86_64 twofish_common camellia serpent blowfish cast5 des_generic cbc xcbc rmd160 sha512_generic sha256_generic sha1_generic md5 crypto_null af_key iptable_mangle ip_set nfnetlink arptable_filter arp_tables iptable_raw iptable_nat tipc xt_tcpudp xt_state xt_pkttype bonding binfmt_misc iptable_filter ip6table_filter ip6_tables nf_nat_ftp nf_nat nf_conntrack_ftp nf_conntrack_ipv4 nf_defrag_ipv4 ip_tables x_tables mperf edd ipmi_devintf ipmi_si ipmi_msghandler nf_conntrack_proto_sctp nf_conntrack sctp 8021q garp stp llc gb_sys usb_storage ioatdma ixgbe uas sg igb iTCO_wdt wmi i2c_i801 pcspkr mdio iTCO_vendor_support button container dca ipv6 autofs4 usbhid megasr(P) ehci_hcd usbcore processor thermal_sys [last unloaded: ipt_PORTMAP]
> Jan 6 16:45:06 ffm-sbc-2a kernel: [3167216.524042]
> Jan 6 16:45:06 ffm-sbc-2a kernel: [3167216.524042] Pid: 0, comm: swapper Tainted: P 3.1.10-gb17-default #1 Intel Corporation S2600CO/S2600CO
> Jan 6 16:45:06 ffm-sbc-2a kernel: [3167216.524042] RIP: 0010:[<ffffffff81007f51>] [<ffffffff81007f51>] native_read_tsc+0x2/0xf
> Jan 6 16:45:06 ffm-sbc-2a kernel: [3167216.524042] RSP: 0018:ffff88043ee03db0 EFLAGS: 00000803
> Jan 6 16:45:06 ffm-sbc-2a kernel: [3167216.524042] RAX: 0000000037185395 RBX: 00000000000003e9 RCX: 0000000000000001
> Jan 6 16:45:07 ffm-sbc-2a osafimmd[5035]: WA IMMND DOWN on active controller f2 detected at standby immd!! f1. Possible failover
> Jan 6 16:45:07 ffm-sbc-2a osaffmd[5023]: NO Done Locking applications node id:2020f ret val:0
> Jan 6 16:45:07 ffm-sbc-2a opensaf_recovery: Control interface status:0 Role:STANDBY
> Jan 6 16:45:07 ffm-sbc-2a osaffmd[5023]: NO Current role: STANDBY
> Jan 6 16:45:07 ffm-sbc-2a osaffmd[5023]: Rebooting OpenSAF NodeId = 131599 EE Name = , Reason: Received Node Down for peer controller, > OwnNodeId = 131343, SupervisionTime = 60

Is this "WA IMMND DOWN" a normal occurrence?  Perhaps it is pointing
at a root cause.

> Jan 6 16:45:07 ffm-sbc-2a kernel: [3167216.524042] RDX: 0000000000bf0977 RSI: 0000000000000002 RDI: 0000000000032bd4
> Jan 6 16:45:07 ffm-sbc-2a kernel: [3167216.524042] RBP: 0000000000032bd4 R08: 0000000000000000 R09: ffffffff819232b0
> Jan 6 16:45:07 ffm-sbc-2a kernel: [3167216.524042] R10: 7fffffffffffffff R11: 7fffffffffffffff R12: 0000000000000000
> Jan 6 16:45:07 ffm-sbc-2a kernel: [3167216.524042] R13: ffffffff819232b0 R14: 0000000000000001 R15: ffffffff81065c28
> Jan 6 16:45:07 ffm-sbc-2a kernel: [3167216.524042] FS: 0000000000000000(0000) GS:ffff88043ee00000(0000) knlGS:0000000000000000
> Jan 6 16:45:07 ffm-sbc-2a kernel: [3167216.524042] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
> Jan 6 16:45:07 ffm-sbc-2a kernel: [3167216.524042] CR2: 000000000069e034 CR3: 0000000001805000 CR4: 00000000000406f0
> Jan 6 16:45:07 ffm-sbc-2a kernel: [3167216.524042] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> Jan 6 16:45:07 ffm-sbc-2a kernel: [3167216.524042] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
> Jan 6 16:45:07 ffm-sbc-2a kernel: [3167216.524042] Process swapper (pid: 0, threadinfo ffffffff81800000, task ffffffff8180d020)
> Jan 6 16:45:07 ffm-sbc-2a kernel: [3167216.524042] Stack:
> Jan 6 16:45:07 ffm-sbc-2a kernel: [3167216.524042] ffffffff81200eb5 ffffffff81200f44 00000000000003e9 0000000000001000
> Jan 6 16:45:07 ffm-sbc-2a kernel: [3167216.524042] 0000000000000002 ffffffff819232b0 ffffffff81017698 7fffffffffffffff
> Jan 6 16:45:07 ffm-sbc-2a kernel: [3167216.524042] 0000000000000002 0000000000000002 ffffffff81017fdf 0000000000000001
> Jan 6 16:45:07 ffm-sbc-2a kernel: [3167216.524042] Call Trace:
> Jan 6 16:45:07 ffm-sbc-2a kernel: [3167216.524042] [<ffffffff81200eb5>] paravirt_read_tsc+0x5/0x8
> Jan 6 16:45:07 ffm-sbc-2a kernel: [3167216.524042] [<ffffffff81200f44>] delay_tsc+0x1d/0x68
> Jan 6 16:45:07 ffm-sbc-2a kernel: [3167216.524042] [<ffffffff81017698>] native_safe_apic_wait_icr_idle+0x27/0x32
> Jan 6 16:45:07 ffm-sbc-2a kernel: [3167216.524042] [<ffffffff81017fdf>] default_send_IPI_dest_field.constprop.0+0x19/0x4d
> Jan 6 16:45:07 ffm-sbc-2a kernel: [3167216.524042] [<ffffffff8101804b>] default_send_IPI_mask_sequence_phys+0x38/0x6a
> Jan 6 16:45:07 ffm-sbc-2a kernel: [3167216.524042] [<ffffffff8101815e>] arch_trigger_all_cpu_backtrace+0x4d/0x7b
> Jan 6 16:45:07 ffm-sbc-2a kernel: [3167216.524042] [<ffffffff8109801b>] check_cpu_stall+0x66/0xdb
> Jan 6 16:45:07 ffm-sbc-2a kernel: [3167216.524042] [<ffffffff810980aa>] rcu_pending+0x1a/0x10a
> Jan 6 16:45:07 ffm-sbc-2a kernel: [3167216.524042] [<ffffffff8109852c>] rcu_check_callbacks+0x9d/0xae
> Jan 6 16:45:07 ffm-sbc-2a kernel: [3167216.524042] [<ffffffff8104c56c>] update_process_times+0x31/0x63
> Jan 6 16:45:07 ffm-sbc-2a kernel: [3167216.524042] [<ffffffff81065c92>] tick_sched_timer+0x6a/0x90
> Jan 6 16:45:07 ffm-sbc-2a kernel: [3167216.524042] [<ffffffff8105b872>] __run_hrtimer+0xa4/0x148
> Jan 6 16:45:07 ffm-sbc-2a kernel: [3167216.524042] [<ffffffff8105c08e>] hrtimer_interrupt+0xdb/0x19a
> Jan 6 16:45:07 ffm-sbc-2a kernel: [3167216.524042] [<ffffffff81017768>] smp_apic_timer_interrupt+0x6e/0x80
> Jan 6 16:45:07 ffm-sbc-2a kernel: [3167216.524042] [<ffffffff813efcde>] apic_timer_interrupt+0x6e/0x80
> Jan 6 16:45:07 ffm-sbc-2a kernel: [3167216.524042] [<ffffffff81239655>] intel_idle+0xdd/0x104
> Jan 6 16:45:07 ffm-sbc-2a kernel: [3167216.524042] [<ffffffff81304773>] cpuidle_idle_call+0xda/0x169
> Jan 6 16:45:07 ffm-sbc-2a kernel: [3167216.524042] [<ffffffff81001200>] cpu_idle+0x51/0x95
> Jan 6 16:45:07 ffm-sbc-2a kernel: [3167216.524042] [<ffffffff8193db0f>] start_kernel+0x388/0x393
> Jan 6 16:45:07 ffm-sbc-2a kernel: [3167216.524042] [<ffffffff8193d3af>] x86_64_start_kernel+0xcf/0xdc
> Jan 6 16:45:07 ffm-sbc-2a kernel: [3167216.524042] Code: 74 03 e6 80 c3 e6 ed c3 bf 8e 21 00 00 e9 ba 8f 1f 00 c3 90 90 90 40 88 f8 e6 70 e4 71 c3 40 88 f0 e6 70 40 88 f8 e6 71 c3 0f 31
> Jan 6 16:45:07 ffm-sbc-2a kernel[3167216.524042]: c1 48 89 d0 48 c1 e0 20 48 09 c8 c3 41 56 41 55 41 54 55 53
> 
> .
> .
> .
> .
> .
> .
> 
> Jan 6 16:45:07 ffm-sbc-2a kernel: [3167216.830734] NMI backtrace for cpu 31
> Jan 6 16:45:07 ffm-sbc-2a kernel: [3167216.830734] CPU 31
> Jan 6 16:45:07 ffm-sbc-2a kernel: [3167216.830734] Modules linked in: nf_conntrack_netlink af_packet xt_sharedlimit xt_hashlimit ip_set_hash_ipport ip_set_hash_ipportip xt_NOTRACK ip_set_bitmap_port xt_sctp nf_conntrack_ipv6 nf_defrag_ipv6 xt_CT arpt_mangle ip_set_hash_ipnet xt_NFLOG nfnetlink_log ipt_ULOG xt_limit xt_hashcounter ip_set_hash_ipip xt_set ip_set_hash_ip deflate ctr twofish_x86_64 twofish_common camellia serpent > blowfish cast5 des_generic cbc xcbc rmd160 sha512_generic sha256_generic sha1_generic md5 crypto_null af_key iptable_mangle ip_set nfnetlink arptable_filter arp_tables iptable_raw iptable_nat tipc xt_tcpudp xt_state xt_pkttype bonding binfmt_misc iptable_filter ip6table_filter ip6_tables nf_nat_ftp nf_nat nf_conntrack_ftp nf_conntrack_ipv4 nf_defrag_ipv4 ip_tables x_tables mperf edd ipmi_devintf ipmi_si ipmi_msghandler nf_conntrack_proto_sctp nf_conntrack sctp 8021q garp stp llc gb_sys usb_storage ioatdma ixgbe uas sg igb iTCO_wdt wmi i2c_i801 pcspkr mdio iTCO_vendor_support button container dca ipv6 autofs4 usbhid megasr(P) ehci_hcd usbcore processor thermal_sys [last unloaded: ipt_PORTMAP]
> Jan 6 16:45:07 ffm-sbc-2a kernel: [3167216.830734]
> Jan 6 16:45:07 ffm-sbc-2a kernel: [3167216.830734] Pid: 0, comm: kworker/0:1 Tainted: P 3.1.10-gb17-default #1 Intel Corporation S2600CO/S2600CO
> Jan 6 16:45:07 ffm-sbc-2a kernel: [3167216.830734] RIP: 0010:[<ffffffff81239624>] [<ffffffff81239624>] intel_idle+0xac/0x104
> Jan 6 16:45:07 ffm-sbc-2a kernel: [3167216.830734] RSP: 0018:ffff880425e33eb8 EFLAGS: 00000046
> Jan 6 16:45:07 ffm-sbc-2a kernel: [3167216.830734] RAX: 0000000000000030 RBX: 0000000000000010 RCX: 0000000000000001
> Jan 6 16:45:07 ffm-sbc-2a kernel: [3167216.830734] RDX: 0000000000000000 RSI: ffff880425e33fd8 RDI: ffffffff81810500
> Jan 6 16:45:07 ffm-sbc-2a kernel: [3167216.830734] RBP: 0000000000000030 R08: 000000000000006d R09: 0000000000034b10
> Jan 6 16:45:07 ffm-sbc-2a kernel: [3167216.830734] R10: ffff88083eded830 R11: ffff88083eded830 R12: 149739342cb2ca49
> Jan 6 16:45:07 ffm-sbc-2a kernel: [3167216.830734] R13: 0000000000000004 R14: 000000000000001f R15: 0000000000000000
> Jan 6 16:45:07 ffm-sbc-2a kernel: [3167216.830734] FS: 0000000000000000(0000) GS:ffff88083ede0000(0000) knlGS:0000000000000000
> Jan 6 16:45:07 ffm-sbc-2a kernel: [3167216.830734] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
> Jan 6 16:45:07 ffm-sbc-2a kernel: [3167216.830734] CR2: 00007fe89df67120 CR3: 0000000001805000 CR4: 00000000000406e0
> Jan 6 16:45:07 ffm-sbc-2a kernel: [3167216.830734] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> Jan 6 16:45:07 ffm-sbc-2a kernel: [3167216.830734] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
> Jan 6 16:45:07 ffm-sbc-2a kernel: [3167216.830734] Process kworker/0:1 (pid: 0, threadinfo ffff880425e32000, task ffff880425e30580)
> Jan 6 16:45:07 ffm-sbc-2a kernel: [3167216.830734] Stack:
> Jan 6 16:45:07 ffm-sbc-2a kernel: [3167225.685484] TIPC: Resetting link <1.1.1:bond0-1.1.2:bond0>, requested by peer
> Jan 6 16:45:07 ffm-sbc-2a kernel: [3167225.685487] TIPC: Lost link <1.1.1:bond0-1.1.2:bond0> on network plane A
> Jan 6 16:45:07 ffm-sbc-2a kernel: [3167225.685491] TIPC: Lost contact with <1.1.2>
> Jan 6 16:45:07 ffm-sbc-2a kernel: [3167225.687214] 0000000000000000 000000000cdd3a47 0000000000000000 000000000cdd3a47
> Jan 6 16:45:07 ffm-sbc-2a kernel: [3167225.687214] ffff880425e33fd8 0000001f3edf8970 ffff88083edf8970 ffff88083edf8b00
> Jan 6 16:45:07 ffm-sbc-2a kernel: [3167225.687214] 0000000000000000 ffffffff81304773 ffffffff819232b0 ffff880425e33fd8
> Jan 6 16:45:07 ffm-sbc-2a kernel: [3167225.687214] Call Trace:
> Jan 6 16:45:07 ffm-sbc-2a kernel: [3167225.687214] [<ffffffff81304773>] cpuidle_idle_call+0xda/0x169
> Jan 6 16:45:07 ffm-sbc-2a kernel: [3167225.687214] [<ffffffff81001200>] cpu_idle+0x51/0x95
> Jan 6 16:45:07 ffm-sbc-2a kernel: [3167225.687214] Code: 28 e0 ff ff 80 e2 08 75 22 31 d2 48 83 c0 10 48 89 d1 0f 01 c8 0f ae f0 48 8b 86 38 e0 ff ff a8 08 75 08 b1 01 48 89 e8 0f 01 c9 <e8> 3f 6e e2 ff 4c 29 e0 48 89 c7 e8 10 ae e0 ff 48 69 e8 40 42
> Jan 6 16:45:07 ffm-sbc-2a kernel: [3167225.687214] Call Trace:
> Jan 6 16:45:07 ffm-sbc-2a kernel: [3167225.687214] [<ffffffff81304773>] cpuidle_idle_call+0xda/0x169
> Jan 6 16:45:07 ffm-sbc-2a kernel: [3167225.687214] [<ffffffff81001200>] cpu_idle+0x51/0x95

Since NMIs were sent to all CPUs, it is not surprising that one was found
to be idle.  Or is there something that I am missing in CPU 31's
backtrace?

> I'm using suse kernel 3.1.10

That is going back a ways!

There are quite a few patches to RCU CPU stall warnings that could
be applied.  It might be easier to move to a newer kernel.

Alternatively, if you are convinced that these stall warnings are
false positives, you could boot with the rcu_cpu_stall_suppress
kernel boot parameter set, or rebuild the kernel with a much larger
value of the RCU_CPU_STALL_TIMEOUT Kconfig option.

							Thanx, Paul

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