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SubjectRe: rb tree hrtimer lockup bug (found by perf_fuzzer)
On Wed, 19 Mar 2014, Thomas Gleixner wrote:

> Good, we have at least a point where we can gather useful
> information. The timer belongs to a delayed work. The work itself is
> tracked via debug objects as well. So we can get that as well. Delta
> patch below.

with that patch applied:

[ 4.314095] Invalid timer base: tmr ffff880117738150 tmr->base (null) base ffffffff81a3edc0
[ 4.324216] ------------[ cut here ]------------
[ 4.329326] WARNING: CPU: 0 PID: 0 at lib/debugobjects.c:261 debug_print_object+0x8c/0xb0()
[ 4.338495] ODEBUG: Info active (active state 0) object type: timer_list hint: (null) delayed_work_timer_fn+0x0/0x20
[ 4.350889] Modules linked in: sg sd_mod sr_mod crc_t10dif cdrom crct10dif_common hid_generic usbhid hid ahci libahci ehci_pci e1000e xhci_hcd libata ehci_hcd ptp crc32c_intel scsi_mod pps_core usbcore usb_common fan thermal thermal_sys
[ 4.375911] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 3.14.0-rc7+ #7
[ 4.382820] Hardware name: LENOVO 10AM000AUS/SHARKBAY, BIOS FBKT72AUS 01/26/2014
[ 4.390947] 0000000000000009 ffff88011ea03d60 ffffffff8155b253 ffff88011ea03da8
[ 4.399428] ffff88011ea03d98 ffffffff810661ad ffff8801179696d8 ffffffff8183a7e0
[ 4.407889] ffffffff8173de38 00000000000291b0 ffffffff818774d0 ffff88011ea03df8
[ 4.416347] Call Trace:
[ 4.419102] <IRQ> [<ffffffff8155b253>] dump_stack+0x45/0x56
[ 4.425545] [<ffffffff810661ad>] warn_slowpath_common+0x7d/0xa0
[ 4.432085] [<ffffffff8106621c>] warn_slowpath_fmt+0x4c/0x50
[ 4.438391] [<ffffffff8131d1ec>] debug_print_object+0x8c/0xb0
[ 4.444799] [<ffffffff8107fc30>] ? __queue_work+0x320/0x320
[ 4.451012] [<ffffffff8131da2c>] debug_object_info+0x1cc/0x1e0
[ 4.457488] [<ffffffff81071904>] cascade+0xc4/0xd0
[ 4.462847] [<ffffffff81072d7c>] run_timer_softirq+0x21c/0x2a0
[ 4.469338] [<ffffffff810cf5db>] ? clockevents_program_event+0x6b/0xf0
[ 4.476553] [<ffffffff8106b5a5>] __do_softirq+0xf5/0x290
[ 4.482483] [<ffffffff8106b98d>] irq_exit+0xad/0xc0
[ 4.487946] [<ffffffff8156c1b5>] smp_apic_timer_interrupt+0x45/0x60
[ 4.494920] [<ffffffff8156ab1d>] apic_timer_interrupt+0x6d/0x80
[ 4.501446] <EOI> [<ffffffff81433232>] ? cpuidle_enter_state+0x52/0xc0
[ 4.508936] [<ffffffff81433359>] cpuidle_idle_call+0xb9/0x1f0
[ 4.515367] [<ffffffff8101e48e>] arch_cpu_idle+0xe/0x30
[ 4.521218] [<ffffffff810bb57e>] cpu_startup_entry+0x9e/0x240
[ 4.527624] [<ffffffff8154c8c7>] rest_init+0x77/0x80
[ 4.533205] [<ffffffff818d4f67>] start_kernel+0x42f/0x43a
[ 4.539210] [<ffffffff818d4941>] ? repair_env_string+0x5c/0x5c
[ 4.545659] [<ffffffff818d4120>] ? early_idt_handlers+0x120/0x120
[ 4.552386] [<ffffffff818d45ee>] x86_64_start_reservations+0x2a/0x2c
[ 4.559454] [<ffffffff818d4733>] x86_64_start_kernel+0x143/0x152
[ 4.566119] ---[ end trace 18d31e7b09fba1ee ]---
[ 4.571194] ------------[ cut here ]------------
[ 4.576258] WARNING: CPU: 0 PID: 0 at lib/debugobjects.c:261 debug_print_object+0x8c/0xb0()
[ 4.585399] ODEBUG: Info initialized (active state 0) object type: work_struct hint: (null) (null)
[ 4.597013] Modules linked in: sg sd_mod sr_mod crc_t10dif cdrom crct10dif_common hid_generic usbhid hid ahci libahci ehci_pci e1000e xhci_hcd libata ehci_hcd ptp crc32c_intel scsi_mod pps_core usbcore usb_common fan thermal thermal_sys
[ 4.622133] CPU: 0 PID: 0 Comm: swapper/0 Tainted: G W 3.14.0-rc7+ #7
[ 4.630166] Hardware name: LENOVO 10AM000AUS/SHARKBAY, BIOS FBKT72AUS 01/26/2014
[ 4.638228] 0000000000000009 ffff88011ea03d60 ffffffff8155b253 ffff88011ea03da8
[ 4.646702] ffff88011ea03d98 ffffffff810661ad ffff880117a4cee8 ffffffff8183b920
[ 4.655159] ffffffff8173de38 00000000000291b0 ffffffff818774d0 ffff88011ea03df8
[ 4.663587] Call Trace:
[ 4.666345] <IRQ> [<ffffffff8155b253>] dump_stack+0x45/0x56
[ 4.672835] [<ffffffff810661ad>] warn_slowpath_common+0x7d/0xa0
[ 4.679422] [<ffffffff8106621c>] warn_slowpath_fmt+0x4c/0x50
[ 4.685657] [<ffffffff8131d1ec>] debug_print_object+0x8c/0xb0
[ 4.692070] [<ffffffff8131da14>] debug_object_info+0x1b4/0x1e0
[ 4.698515] [<ffffffff81071904>] cascade+0xc4/0xd0
[ 4.703868] [<ffffffff81072d7c>] run_timer_softirq+0x21c/0x2a0
[ 4.710359] [<ffffffff810cf5db>] ? clockevents_program_event+0x6b/0xf0
[ 4.717575] [<ffffffff8106b5a5>] __do_softirq+0xf5/0x290
[ 4.723523] [<ffffffff8106b98d>] irq_exit+0xad/0xc0
[ 4.728954] [<ffffffff8156c1b5>] smp_apic_timer_interrupt+0x45/0x60
[ 4.735887] [<ffffffff8156ab1d>] apic_timer_interrupt+0x6d/0x80
[ 4.742470] <EOI> [<ffffffff81433232>] ? cpuidle_enter_state+0x52/0xc0
[ 4.750033] [<ffffffff81433359>] cpuidle_idle_call+0xb9/0x1f0
[ 4.756406] [<ffffffff8101e48e>] arch_cpu_idle+0xe/0x30
[ 4.762233] [<ffffffff810bb57e>] cpu_startup_entry+0x9e/0x240
[ 4.768669] [<ffffffff8154c8c7>] rest_init+0x77/0x80
[ 4.774215] [<ffffffff818d4f67>] start_kernel+0x42f/0x43a
[ 4.780267] [<ffffffff818d4941>] ? repair_env_string+0x5c/0x5c
[ 4.786719] [<ffffffff818d4120>] ? early_idt_handlers+0x120/0x120
[ 4.793484] [<ffffffff818d45ee>] x86_64_start_reservations+0x2a/0x2c
[ 4.800540] [<ffffffff818d4733>] x86_64_start_kernel+0x143/0x152
[ 4.807186] ---[ end trace 18d31e7b09fba1ef ]---
[ 4.812254] ------------[ cut here ]------------
[ 4.817350] kernel BUG at kernel/timer.c:1088!
[ 4.822227] invalid opcode: 0000 [#1] SMP
[ 4.826884] Dumping ftrace buffer:
[ 4.830644] (ftrace buffer empty)
[ 4.834617] Modules linked in: sg sd_mod sr_mod crc_t10dif cdrom crct10dif_common hid_generic usbhid hid ahci libahci ehci_pci e1000e xhci_hcd libata ehci_hcd ptp crc32c_intel scsi_mod pps_core usbcore usb_common fan thermal thermal_sys
[ 4.859699] CPU: 0 PID: 0 Comm: swapper/0 Tainted: G W 3.14.0-rc7+ #7
[ 4.867705] Hardware name: LENOVO 10AM000AUS/SHARKBAY, BIOS FBKT72AUS 01/26/2014
[ 4.875771] task: ffffffff81815460 ti: ffffffff81800000 task.ti: ffffffff81800000
[ 4.883928] RIP: 0010:[<ffffffff81071904>] [<ffffffff81071904>] cascade+0xc4/0xd0
[ 4.892320] RSP: 0018:ffff88011ea03e78 EFLAGS: 00010002
[ 4.898134] RAX: 0000000000000024 RBX: ffff880117738150 RCX: 0000000000000854
[ 4.905885] RDX: 0000000000001462 RSI: 0000000000000002 RDI: 0000000000000002
[ 4.913698] RBP: ffff88011ea03ea8 R08: 0000000000000000 R09: 00000000000002d7
[ 4.921440] R10: ffffffff8165a580 R11: ffff88011ea03a9e R12: ffffffff81a3edc0
[ 4.929190] R13: ffff88011ea03e78 R14: 000000000000001f R15: ffffffff818774d0
[ 4.936983] FS: 0000000000000000(0000) GS:ffff88011ea00000(0000) knlGS:0000000000000000
[ 4.945826] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 4.952134] CR2: 00007fe0f44a39d8 CR3: 000000000180e000 CR4: 00000000001407f0
[ 4.959929] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 4.967728] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 4.975473] Stack:
[ 4.977744] ffff8801176f7060 ffff88011ea10740 ffffffff81a3edc0 0000000000000000
[ 4.986202] 0000000000000001 0000000000000100 ffff88011ea03f18 ffffffff81072d7c
[ 4.994649] ffffffff81a409e8 ffffffff81a405e8 ffffffff81a401e8 ffffffff81a3fde8
[ 5.003114] Call Trace:
[ 5.005838] <IRQ>
[ 5.007979] [<ffffffff81072d7c>] run_timer_softirq+0x21c/0x2a0
[ 5.014893] [<ffffffff810cf5db>] ? clockevents_program_event+0x6b/0xf0
[ 5.022102] [<ffffffff8106b5a5>] __do_softirq+0xf5/0x290
[ 5.028027] [<ffffffff8106b98d>] irq_exit+0xad/0xc0
[ 5.033464] [<ffffffff8156c1b5>] smp_apic_timer_interrupt+0x45/0x60
[ 5.040410] [<ffffffff8156ab1d>] apic_timer_interrupt+0x6d/0x80
[ 5.046956] <EOI>
[ 5.049095] [<ffffffff81433232>] ? cpuidle_enter_state+0x52/0xc0
[ 5.056119] [<ffffffff81433359>] cpuidle_idle_call+0xb9/0x1f0
[ 5.062487] [<ffffffff8101e48e>] arch_cpu_idle+0xe/0x30
[ 5.070787] [<ffffffff810bb57e>] cpu_startup_entry+0x9e/0x240
[ 5.077142] [<ffffffff8154c8c7>] rest_init+0x77/0x80
[ 5.082670] [<ffffffff818d4f67>] start_kernel+0x42f/0x43a
[ 5.088685] [<ffffffff818d4941>] ? repair_env_string+0x5c/0x5c
[ 5.095155] [<ffffffff818d4120>] ? early_idt_handlers+0x120/0x120
[ 5.101910] [<ffffffff818d45ee>] x86_64_start_reservations+0x2a/0x2c
[ 5.108979] [<ffffffff818d4733>] x86_64_start_kernel+0x143/0x152
[ 5.115630] Code: 5d 41 5e 5d c3 48 89 f3 4c 89 e1 48 89 de 48 c7 c7 f8 05 71 81 31 c0 e8 be 6d 4e 00 48 c7 c6 e0 a7 83 81 48 89 df e8 5c bf 2a 00 <0f> 0b 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 55 48 89 e5
[ 5.141945] RIP [<ffffffff81071904>] cascade+0xc4/0xd0
[ 5.147774] RSP <ffff88011ea03e78>
[ 5.151625] ---[ end trace 18d31e7b09fba1f0 ]---
[ 5.156707] Kernel panic - not syncing: Fatal exception in interrupt
[ 5.163725] Dumping ftrace buffer:
[ 5.167535] (ftrace buffer empty)
[ 5.171488] Kernel Offset: 0x0 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffff9fffffff)



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