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SubjectRe: rb tree hrtimer lockup bug (found by perf_fuzzer)
On Tue, 18 Mar 2014, Thomas Gleixner wrote:

> On Tue, 18 Mar 2014, Vince Weaver wrote:
>
> > On Tue, 18 Mar 2014, Thomas Gleixner wrote:
> > >
> > > > [ 3.678040] BUG: unable to handle kernel NULL pointer dereference at 0000000000000018
> > > > [ 3.686776] IP: [<ffffffff8106d7a8>] get_next_timer_interrupt+0x168/0x250
> > >
> > > The back trace is not really helpful. Is there anything before that
> > > BUG in dmesg?
> >
> > no, just normal boot messages.
> >
> > I re-compiled with the frame pointer enabled and here's an updated
> > version:
> >
> > [ 3.722836] sd 1:0:0:0: [sda] 4096-byte physical blocks
> > [ 3.728682] sd 1:0:0:0: [sda] Write Protect is off
> > [ 3.728826] sr 0:0:0:0: Attached scsi generic sg0 type 5
> > [ 3.728992] sd 1:0:0:0: Attached scsi generic sg1 type 0
> > [ 3.745700] sd 1:0:0:0: [sda] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
> > [ 3.787096] sda: sda1 sda2 sda3 sda4
> > [ 3.792169] sd 1:0:0:0: [sda] Attached SCSI disk
> > [ 4.312111] ------------[ cut here ]------------
> > [ 4.317176] kernel BUG at kernel/timer.c:1084!
>
> Wow. That's in the cascade code. So it looks like the timer got
> corrupted without using the timer api wrong. That might be a memset or
> a stray pointer. Can you apply the following patch?
>
> That really should give us a hint.
>
> If that fails, enable the tracer in your config and add the following
> to your commandline
>
> trace_event=timer_* ftrace_dump_on_oops
>
> That will spill out a lot of crap over serial, but it should tell us
> which timer is corrupted.
>
> Thanks,

your patch didn't seem to print anything additional the first time throug.

I then tried the trace command you suggested, but I'm getting an empty
ftrace buffer which possibly means I don't have enough ftrace kernel
options enabled.

Here's the most recent boot crash.

[ 0.000000] Command line: BOOT_IMAGE=/boot/vmlinuz-3.14.0-rc7+ root=UUID=ec527b30-713c-47c1-bf23-9df8681afab7 ro console=tty0 console=ttyS0,115200n8 trace_event=timer_* ftrace_dump_on_oops
...
[ 5.342788] Invalid timer base: tmr ffff880117740150 tmr->base (null) base ffff880118894000
[ 5.352842] ------------[ cut here ]------------
[ 5.357938] WARNING: CPU: 1 PID: 0 at lib/debugobjects.c:260 debug_print_object+0x83/0xa0()
[ 5.367069] ODEBUG: Info active (active state 0) object type: timer_list hint: (null)
[ 5.376559] Modules linked in: sg sd_mod sr_mod crc_t10dif cdrom crct10dif_common hid_generic usbhid hid ahci libahci e1000e libata ehci_pci ptp xhci_hcd ehci_hcd pps_core scsi_mod crc32c_intel usbcore usb_common thermal fan thermal_sys
[ 5.401708] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 3.14.0-rc7+ #5
[ 5.408653] Hardware name: LENOVO 10AM000AUS/SHARKBAY, BIOS FBKT72AUS 01/26/2014
[ 5.416781] 0000000000000009 ffff88011ea43d68 ffffffff8155b113 ffff88011ea43db0
[ 5.425271] ffff88011ea43da0 ffffffff810661ad ffff880117a3af88 ffffffff8183a7e0
[ 5.433768] ffffffff8173de38 00000000000258b0 ffffffff818774d0 ffff88011ea43e00
[ 5.442264] Call Trace:
[ 5.445021] <IRQ> [<ffffffff8155b113>] dump_stack+0x45/0x56
[ 5.451533] [<ffffffff810661ad>] warn_slowpath_common+0x7d/0xa0
[ 5.458165] [<ffffffff8106621c>] warn_slowpath_fmt+0x4c/0x50
[ 5.464499] [<ffffffff8131d1e3>] debug_print_object+0x83/0xa0
[ 5.470919] [<ffffffff8131d904>] debug_object_info+0xf4/0x100
[ 5.477310] [<ffffffff81071904>] cascade+0xc4/0xd0
[ 5.482664] [<ffffffff81072d7c>] run_timer_softirq+0x21c/0x2a0
[ 5.489123] [<ffffffff810cf5db>] ? clockevents_program_event+0x6b/0xf0
[ 5.496362] [<ffffffff8106b5a5>] __do_softirq+0xf5/0x290
[ 5.502288] [<ffffffff8106b98d>] irq_exit+0xad/0xc0
[ 5.507758] [<ffffffff8156c075>] smp_apic_timer_interrupt+0x45/0x60
[ 5.514694] [<ffffffff8156a9dd>] apic_timer_interrupt+0x6d/0x80
[ 5.521291] <EOI> [<ffffffff814330f2>] ? cpuidle_enter_state+0x52/0xc0
[ 5.528865] [<ffffffff81433219>] cpuidle_idle_call+0xb9/0x1f0
[ 5.535305] [<ffffffff8101e48e>] arch_cpu_idle+0xe/0x30
[ 5.541152] [<ffffffff810bb57e>] cpu_startup_entry+0x9e/0x240
[ 5.547572] [<ffffffff81044af0>] start_secondary+0x1a0/0x1f0
[ 5.553844] ---[ end trace 32b995b31388939e ]---
[ 5.558927] ------------[ cut here ]------------
[ 5.563994] kernel BUG at kernel/timer.c:1088!
[ 5.568922] invalid opcode: 0000 [#1] SMP
[ 5.573614] Dumping ftrace buffer:
[ 5.577383] (ftrace buffer empty)
[ 5.581373] Modules linked in: sg sd_mod sr_mod crc_t10dif cdrom crct10dif_common hid_generic usbhid hid ahci libahci e1000e libata ehci_pci ptp xhci_hcd ehci_hcd pps_core scsi_mod crc32c_intel usbcore usb_common thermal fan thermal_sys
[ 5.606612] CPU: 1 PID: 0 Comm: swapper/1 Tainted: G W 3.14.0-rc7+ #5
[ 5.614634] Hardware name: LENOVO 10AM000AUS/SHARKBAY, BIOS FBKT72AUS 01/26/2014
[ 5.622701] task: ffff8801188609c0 ti: ffff880118866000 task.ti: ffff880118866000
[ 5.630944] RIP: 0010:[<ffffffff81071904>] [<ffffffff81071904>] cascade+0xc4/0xd0
[ 5.639315] RSP: 0018:ffff88011ea43e78 EFLAGS: 00010002
[ 5.645132] RAX: 0000000000000024 RBX: ffff880117740150 RCX: 000000000000079f
[ 5.652919] RDX: 00000000000012d0 RSI: 0000000000000002 RDI: 0000000000000002
[ 5.660704] RBP: ffff88011ea43ea8 R08: 0000000000000000 R09: 00000000000002b1
[ 5.668470] R10: ffffffff8165a580 R11: ffff88011ea43aa6 R12: ffff880118894000
[ 5.676255] R13: ffff88011ea43e78 R14: 0000000000000020 R15: ffffffff818774d0
[ 5.684061] FS: 0000000000000000(0000) GS:ffff88011ea40000(0000) knlGS:0000000000000000
[ 5.692928] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 5.699184] CR2: 0000000000bc5304 CR3: 000000000180e000 CR4: 00000000001407e0
[ 5.706984] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 5.714744] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 5.722511] Stack:
[ 5.724768] ffff880117740150 ffff88011ea50740 ffff880118894000 0000000000000000
[ 5.733264] 0000000000000001 0000000000000100 ffff88011ea43f18 ffffffff81072d7c
[ 5.741748] ffff880118895c28 ffff880118895828 ffff880118895428 ffff880118895028
[ 5.750236] Call Trace:
[ 5.752992] <IRQ>
[ 5.755142] [<ffffffff81072d7c>] run_timer_softirq+0x21c/0x2a0
[ 5.762074] [<ffffffff810cf5db>] ? clockevents_program_event+0x6b/0xf0
[ 5.769362] [<ffffffff8106b5a5>] __do_softirq+0xf5/0x290
[ 5.775279] [<ffffffff8106b98d>] irq_exit+0xad/0xc0
[ 5.780721] [<ffffffff8156c075>] smp_apic_timer_interrupt+0x45/0x60
[ 5.787676] [<ffffffff8156a9dd>] apic_timer_interrupt+0x6d/0x80
[ 5.794270] <EOI>
[ 5.796439] [<ffffffff814330f2>] ? cpuidle_enter_state+0x52/0xc0
[ 5.803559] [<ffffffff81433219>] cpuidle_idle_call+0xb9/0x1f0
[ 5.809934] [<ffffffff8101e48e>] arch_cpu_idle+0xe/0x30
[ 5.815794] [<ffffffff810bb57e>] cpu_startup_entry+0x9e/0x240
[ 5.822160] [<ffffffff81044af0>] start_secondary+0x1a0/0x1f0
[ 5.828463] 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 7e 6c 4e 00 48 c7 c6 e0 a7 83 81 48 89 df e8 0c bf 2a 00 <0f> 0b 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 55 48 89 e5
[ 5.854807] RIP [<ffffffff81071904>] cascade+0xc4/0xd0
[ 5.860662] RSP <ffff88011ea43e78>
[ 5.864547] ---[ end trace 32b995b31388939f ]---
[ 5.869596] Kernel panic - not syncing: Fatal exception in interrupt
[ 5.876532] Dumping ftrace buffer:
[ 5.880352] (ftrace buffer empty)
[ 5.884368] Kernel Offset: 0x0 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffff9fffffff)



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