Hello,
Right after boot, on both 4.6.1-rt2 and 4.6.1-rt3, I saw the lockdep warning
listed below. What caught my attention are those two lines:
DEBUG_LOCKS_WARN_ON(chain->depth != curr->lockdep_depth - (i - 1))
modprobe/1050: Hash chain already cached but the contents don't match!
Anybody else saw something similar?
[ 30.736024] ------------[ cut here ]------------
[ 30.736028] WARNING: CPU: 1 PID: 1050 at /home/lclaudio/kernel-rt/kernel/locking/lockdep.c:2090 __lock_acquire+0x17d8/0x1fb0
[ 30.736030] DEBUG_LOCKS_WARN_ON(chain->depth != curr->lockdep_depth - (i - 1))
[ 30.736059] Modules linked in: nf_conntrack(+) bnep coretemp kvm_intel kvm arc4 rt2800pci rt2800mmio rt2800lib eeprom_93cx6 rt2x00pci rt2x00mmio rt2x00lib btusb btrtl btbcm vfat fat mac80211 btintel bluetooth iTCO_wdt iTCO_vendor_support joydev irqbypass snd_hda_codec_idt crc32c_intel pcspkr ghash_clmulni_intel snd_hda_codec_generic snd_hda_intel snd_hda_codec cfg80211 acpi_cpufreq snd_hda_core crc_ccitt rfkill snd_hwdep tpm_tis snd_seq tpm snd_seq_device snd_pcm shpchp snd_timer snd soundcore lpc_ich mfd_core i2c_i801 nfsd auth_rpcgss nfs_acl lockd grace sunrpc binfmt_misc sch_fq_codel i915 serio_raw i2c_algo_bit drm_kms_helper syscopyarea sysfillrect sysimgblt fb_sys_fops drm r8169 mii i2c_core video usb_storage efivarfs
[ 30.736060] CPU: 1 PID: 1050 Comm: modprobe Not tainted 4.6.1-rt3 #2
[ 30.736061] Hardware name: Hewlett-Packard p7-1512/2ADA, BIOS 8.15 02/05/2013
[ 30.736063] 0000000000000086 00000000c9a2388d ffff8800d31c34a8 ffffffff813f1c5c
[ 30.736064] ffff8800d31c34f8 0000000000000000 ffff8800d31c34e8 ffffffff81088954
[ 30.736065] 0000082a00000008 ffff88003ca3c000 0000000000000000 ffffffff8239cb20
[ 30.736065] Call Trace:
[ 30.736069] [<ffffffff813f1c5c>] dump_stack+0x67/0x9b
[ 30.736070] [<ffffffff81088954>] __warn+0xe4/0x100
[ 30.736072] [<ffffffff810889cf>] warn_slowpath_fmt+0x5f/0x80
[ 30.736073] [<ffffffff810e7f78>] __lock_acquire+0x17d8/0x1fb0
[ 30.736075] [<ffffffff810e92d4>] lock_acquire+0x124/0x240
[ 30.736078] [<ffffffff81804f43>] ? __schedule+0xf3/0xc70
[ 30.736080] [<ffffffff81809651>] _raw_spin_lock+0x41/0x80
[ 30.736081] [<ffffffff81804f43>] ? __schedule+0xf3/0xc70
[ 30.736082] [<ffffffff81804f43>] __schedule+0xf3/0xc70
[ 30.736083] [<ffffffff81806040>] ? preempt_schedule_irq+0x60/0xb0
[ 30.736084] [<ffffffff81412843>] ? __this_cpu_preempt_check+0x13/0x20
[ 30.736086] [<ffffffff8180604b>] preempt_schedule_irq+0x6b/0xb0
[ 30.736087] [<ffffffff8180b092>] do_preempt_schedule_irq+0x5/0x17
[ 30.736090] [<ffffffff81222386>] ? __slab_alloc.isra.71+0x86/0xc0
[ 30.736093] [<ffffffff816b0147>] ? __alloc_skb+0x87/0x1f0
[ 30.736094] [<ffffffff8122574c>] __kmalloc_node_track_caller+0xcc/0x520
[ 30.736096] [<ffffffff816b0147>] ? __alloc_skb+0x87/0x1f0
[ 30.736097] [<ffffffff816af271>] __kmalloc_reserve.isra.33+0x31/0x90
[ 30.736098] [<ffffffff816b011b>] ? __alloc_skb+0x5b/0x1f0
[ 30.736100] [<ffffffff816b0147>] __alloc_skb+0x87/0x1f0
[ 30.736102] [<ffffffff813f6163>] kobject_uevent_env+0x3f3/0x650
[ 30.736103] [<ffffffff813f63cb>] kobject_uevent+0xb/0x10
[ 30.736104] [<ffffffff81223324>] sysfs_slab_add+0x1a4/0x1f0
[ 30.736105] [<ffffffff81225276>] __kmem_cache_create+0x4a6/0x540
[ 30.736108] [<ffffffff811e315b>] ? create_cache+0x3b/0x180
[ 30.736111] [<ffffffff81107a5f>] ? rcu_read_lock_sched_held+0x7f/0x90
[ 30.736112] [<ffffffff81224078>] ? kmem_cache_alloc+0x2b8/0x330
[ 30.736113] [<ffffffff811e31b7>] create_cache+0x97/0x180
[ 30.736115] [<ffffffff811e345a>] kmem_cache_create+0x1ba/0x280
[ 30.736116] [<ffffffffa07e6000>] ? 0xffffffffa07e6000
[ 30.736121] [<ffffffffa079c5ce>] nf_conntrack_init_net+0x15e/0x2b0 [nf_conntrack]
[ 30.736126] [<ffffffffa079d0f4>] nf_conntrack_pernet_init+0x14/0x170 [nf_conntrack]
[ 30.736127] [<ffffffff816bb491>] ops_init+0x41/0x170
[ 30.736128] [<ffffffffa07e6000>] ? 0xffffffffa07e6000
[ 30.736129] [<ffffffff816bb84d>] register_pernet_operations+0x10d/0x1b0
[ 30.736131] [<ffffffff816bb918>] register_pernet_subsys+0x28/0x40
[ 30.736135] [<ffffffffa07e6055>] nf_conntrack_standalone_init+0x55/0x1000 [nf_conntrack]
[ 30.736137] [<ffffffff810003e3>] do_one_initcall+0xb3/0x1f0
[ 30.736138] [<ffffffff81107a5f>] ? rcu_read_lock_sched_held+0x7f/0x90
[ 30.736139] [<ffffffff81223075>] ? kmem_cache_alloc_trace+0x2c5/0x330
[ 30.736141] [<ffffffff811b17ba>] ? do_init_module+0x27/0x1d7
[ 30.736142] [<ffffffff811b17f2>] do_init_module+0x5f/0x1d7
[ 30.736145] [<ffffffff811360df>] load_module+0x212f/0x2850
[ 30.736146] [<ffffffff81132680>] ? __symbol_put+0xa0/0xa0
[ 30.736149] [<ffffffff8123ce49>] ? vfs_read+0x119/0x130
[ 30.736152] [<ffffffff81136a96>] SYSC_finit_module+0xe6/0x120
[ 30.736153] [<ffffffff81136aee>] SyS_finit_module+0xe/0x10
[ 30.736154] [<ffffffff81003101>] do_syscall_64+0x61/0x170
[ 30.736155] [<ffffffff8180a75a>] entry_SYSCALL64_slow_path+0x25/0x25
[ 30.736156] ---[ end trace 0000000000000002 ]---
[ 30.736157] ======================
[ 30.736157] [chain_key collision ]
[ 30.736158] 4.6.1-rt3 #2 Tainted: G W
[ 30.736158] ----------------------
[ 30.736159] modprobe/1050: Hash chain already cached but the contents don't match!
[ 30.736159] Held locks:depth: 6
[ 30.736162] class_idx:173 -> chain_key:00000000000000ad (net_mutex){+.+.+.}, at: [<ffffffff816bb909>] register_pernet_subsys+0x19/0x40
[ 30.736164] class_idx:46 -> chain_key:000000000015a02e (cpu_hotplug.lock){++++++}, at: [<ffffffff81089172>] get_online_cpus+0x32/0x80
[ 30.736166] class_idx:49 -> chain_key:00000002b405c031 (memcg_cache_ids_sem){.+.+.+}, at: [<ffffffff810eee90>] rt_down_read+0x10/0x20
[ 30.736169] class_idx:51 -> chain_key:00005680b8062033 (slab_mutex){+.+.+.}, at: [<ffffffff811e32eb>] kmem_cache_create+0x4b/0x280
[ 30.736171] class_idx:325 -> chain_key:0ad01700c4066145 (uevent_sock_mutex){+.+.+.}, at: [<ffffffff813f60b6>] kobject_uevent_env+0x346/0x650
[ 30.736173] class_idx:54 -> chain_key:02e01880cc28a16c (&rq->lock){-...-.}, at: [<ffffffff81804f43>] __schedule+0xf3/0xc70
[ 30.736174] Locks in cached chain:depth: 5
[ 30.736175] class_idx:46 -> chain_key:000000000000002e (cpu_hotplug.lock){++++++}
[ 30.736176] class_idx:49 -> chain_key:000000000005c031 (memcg_cache_ids_sem){.+.+.+}
[ 30.736177] class_idx:51 -> chain_key:00000000b8062033 (slab_mutex){+.+.+.}
[ 30.736178] class_idx:325 -> chain_key:00001700c4066145 (uevent_sock_mutex){+.+.+.}
[ 30.736179] class_idx:364 -> chain_key:02e01880cc28a16c (nl_table_wait.lock.lock.wait_lock){......}
[ 30.736179]
stack backtrace:
[ 30.736180] CPU: 1 PID: 1050 Comm: modprobe Tainted: G W 4.6.1-rt3 #2
[ 30.736180] Hardware name: Hewlett-Packard p7-1512/2ADA, BIOS 8.15 02/05/2013
[ 30.736181] 0000000000000086 00000000c9a2388d ffff8800d31c3508 ffffffff813f1c5c
[ 30.736183] ffffffff8239cb20 000000000000016b ffff8800d31c3550 ffffffff810e4a37
[ 30.736184] ffff88003ca3cab0 ffff88003ca3c9d0 ffff88003ca3c000 0000000000000000
[ 30.736184] Call Trace:
[ 30.736185] [<ffffffff813f1c5c>] dump_stack+0x67/0x9b
[ 30.736186] [<ffffffff810e4a37>] print_collision+0x157/0x260
[ 30.736188] [<ffffffff810e7b50>] __lock_acquire+0x13b0/0x1fb0
[ 30.736189] [<ffffffff810e92d4>] lock_acquire+0x124/0x240
[ 30.736191] [<ffffffff81804f43>] ? __schedule+0xf3/0xc70
[ 30.736192] [<ffffffff81809651>] _raw_spin_lock+0x41/0x80
[ 30.736193] [<ffffffff81804f43>] ? __schedule+0xf3/0xc70
[ 30.736194] [<ffffffff81804f43>] __schedule+0xf3/0xc70
[ 30.736195] [<ffffffff81806040>] ? preempt_schedule_irq+0x60/0xb0
[ 30.736196] [<ffffffff81412843>] ? __this_cpu_preempt_check+0x13/0x20
[ 30.736198] [<ffffffff8180604b>] preempt_schedule_irq+0x6b/0xb0
[ 30.736199] [<ffffffff8180b092>] do_preempt_schedule_irq+0x5/0x17
[ 30.736200] [<ffffffff81222386>] ? __slab_alloc.isra.71+0x86/0xc0
[ 30.736202] [<ffffffff816b0147>] ? __alloc_skb+0x87/0x1f0
[ 30.736203] [<ffffffff8122574c>] __kmalloc_node_track_caller+0xcc/0x520
[ 30.736204] [<ffffffff816b0147>] ? __alloc_skb+0x87/0x1f0
[ 30.736206] [<ffffffff816af271>] __kmalloc_reserve.isra.33+0x31/0x90
[ 30.736207] [<ffffffff816b011b>] ? __alloc_skb+0x5b/0x1f0
[ 30.736208] [<ffffffff816b0147>] __alloc_skb+0x87/0x1f0
[ 30.736210] [<ffffffff813f6163>] kobject_uevent_env+0x3f3/0x650
[ 30.736212] [<ffffffff813f63cb>] kobject_uevent+0xb/0x10
[ 30.736213] [<ffffffff81223324>] sysfs_slab_add+0x1a4/0x1f0
[ 30.736214] [<ffffffff81225276>] __kmem_cache_create+0x4a6/0x540
[ 30.736215] [<ffffffff811e315b>] ? create_cache+0x3b/0x180
[ 30.736217] [<ffffffff81107a5f>] ? rcu_read_lock_sched_held+0x7f/0x90
[ 30.736218] [<ffffffff81224078>] ? kmem_cache_alloc+0x2b8/0x330
[ 30.736219] [<ffffffff811e31b7>] create_cache+0x97/0x180
[ 30.736221] [<ffffffff811e345a>] kmem_cache_create+0x1ba/0x280
[ 30.736222] [<ffffffffa07e6000>] ? 0xffffffffa07e6000
[ 30.736225] [<ffffffffa079c5ce>] nf_conntrack_init_net+0x15e/0x2b0 [nf_conntrack]
[ 30.736229] [<ffffffffa079d0f4>] nf_conntrack_pernet_init+0x14/0x170 [nf_conntrack]
[ 30.736230] [<ffffffff816bb491>] ops_init+0x41/0x170
[ 30.736231] [<ffffffffa07e6000>] ? 0xffffffffa07e6000
[ 30.736232] [<ffffffff816bb84d>] register_pernet_operations+0x10d/0x1b0
[ 30.736233] [<ffffffff816bb918>] register_pernet_subsys+0x28/0x40
[ 30.736237] [<ffffffffa07e6055>] nf_conntrack_standalone_init+0x55/0x1000 [nf_conntrack]
[ 30.736238] [<ffffffff810003e3>] do_one_initcall+0xb3/0x1f0
[ 30.736240] [<ffffffff81107a5f>] ? rcu_read_lock_sched_held+0x7f/0x90
[ 30.736241] [<ffffffff81223075>] ? kmem_cache_alloc_trace+0x2c5/0x330
[ 30.736242] [<ffffffff811b17ba>] ? do_init_module+0x27/0x1d7
[ 30.736243] [<ffffffff811b17f2>] do_init_module+0x5f/0x1d7
[ 30.736245] [<ffffffff811360df>] load_module+0x212f/0x2850
[ 30.736246] [<ffffffff81132680>] ? __symbol_put+0xa0/0xa0
[ 30.736248] [<ffffffff8123ce49>] ? vfs_read+0x119/0x130
[ 30.736250] [<ffffffff81136a96>] SYSC_finit_module+0xe6/0x120
[ 30.736252] [<ffffffff81136aee>] SyS_finit_module+0xe/0x10
[ 30.736252] [<ffffffff81003101>] do_syscall_64+0x61/0x170
[ 30.736253] [<ffffffff8180a75a>] entry_SYSCALL64_slow_path+0x25/0x25
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