Messages in this thread | | | Date | Mon, 15 Dec 2008 21:41:05 +0000 | From | Ottavio Campana <> | Subject | Re: Oops when trying to create more than 16000 timers |
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Pekka Enberg wrote: > Hi Ottavio, > > On Mon, Dec 15, 2008 at 6:04 PM, Ottavio Campana > <ottavio.campana@dei.unipd.it> wrote: >> I am currently developing a software that needs approx 60k timers. I >> currently use timer_create and all the relative functions to manage timers. >> >> I've noticed that after having created 16039 timers I always get an oops >> from the kernel, which are always of the same kind: >> >> Dec 15 15:20:00 evolution kernel: [601680.417064] BUG: unable to handle >> kernel NULL pointer dereference at 0000000000000040 . > > This would be a kernel bug so can you please post the full oops. See > REPORTING-BUGS and Documentation/oops-tracing.txt for details.
I hope the report is correct, please tell me if you want me to do something else.
PGD 7adfc067 PUD 7ad5e067 PMD 0 CPU 1 Modules linked in: ipv6 dm_snapshot dm_mirror dm_log dm_mod loop e1000 snd_hda_intel snd_pcm_oss snd_pcm snd_mixer_oss snd_seq_dummy snd_seq_oss snd_seq_midi_event snd_seq snd_timer snd_seq_device parport_pc psmouse iTCO_wdt snd parport i2c_i801 serio_raw soundcore i2c_core pcspkr snd_page_alloc evdev button intel_agp dcdbas ext3 jbd mbcache sg sr_mod cdrom sd_mod ata_piix uhci_hcd ehci_hcd e1000e ide_pci_generic ide_core ata_generic libata scsi_mod dock thermal processor fan thermal_sys Pid: 2743, comm: timer_tester Not tainted 2.6.26-1-amd64 #1 RIP: 0010:[<ffffffff80245291>] [<ffffffff80245291>] sys_timer_create+0x79/0x360 RSP: 0018:ffff81007a5ddef8 EFLAGS: 00010286 RAX: 0000000000000001 RBX: 0000000000000000 RCX: 0000000000000086 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000286 RBP: 0000000000000000 R08: 0000000000000004 R09: 0000000000000001 R10: 00007f927adb3a50 R11: 0000000000000000 R12: 00000000016ed768 R13: 00000000016ed6d0 R14: 00007fff833dead0 R15: 00000000016ed754 FS: 00007f927b3cd6e0(0000) GS:ffff81007d37a9c0(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b CR2: 0000000000000040 CR3: 000000007b00c000 CR4: 00000000000006e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 Process timer_tester (pid: 2743, threadinfo ffff81007a5dc000, task ffff81007a7936b0) Stack: ffff81007646f9f8 0000000000000000 0000000000000000 ffffffff8029b4ed 0000000000000000 ffff81007b024c80 0000000000000017 fffffffffffffff7 00007f927b3da000 ffffffff8029ba36 0000000000000292 0000000000000000 Call Trace: [<ffffffff8029b4ed>] vfs_write+0x121/0x156 [<ffffffff8029ba36>] sys_write+0x60/0x6e [<ffffffff8020beca>] system_call_after_swapgs+0x8a/0x8f
Code: c6 0e 05 00 48 85 c0 74 3b 48 89 c5 e8 d0 a0 ff ff 48 85 c0 48 89 45 40 75 11 48 8b 3d e1 22 3e 00 48 89 ee 31 ed e8 fe 10 05 00 <48> 8b 7d 40 31 f6 ba 80 00 00 00 48 83 c7 18 e8 6b ae 0d 00 48 RIP [<ffffffff80245291>] sys_timer_create+0x79/0x360 RSP <ffff81007a5ddef8> CR2: 0000000000000040 ---[ end trace 2e93d77cdbbd83c6 ]---
Using decodecode
Code: c6 0e 05 00 48 85 c0 74 3b 48 89 c5 e8 d0 a0 ff ff 48 85 c0 48 89 45 40 75 11 48 8b 3d e1 22 3e 00 48 89 ee 31 ed e8 fe 10 05 00 <48> 8b 7d 40 31 f6 ba 80 00 00 00 48 83 c7 18 e8 6b ae 0d 00 48
/tmp/tmp.CcCjFxHOMN.o: file format elf64-x86-64
Disassembly of section .text:
0000000000000000 <.text>: 0: c6 (bad) 1: 0e (bad) 2: 05 00 48 85 c0 add $0xc0854800,%eax 7: 74 3b je 0x44 9: 48 89 c5 mov %rax,%rbp c: e8 d0 a0 ff ff callq 0xffffffffffffa0e1 11: 48 85 c0 test %rax,%rax 14: 48 89 45 40 mov %rax,0x40(%rbp) 18: 75 11 jne 0x2b 1a: 48 8b 3d e1 22 3e 00 mov 0x3e22e1(%rip),%rdi # 0x3e2302 21: 48 89 ee mov %rbp,%rsi 24: 31 ed xor %ebp,%ebp 26: e8 fe 10 05 00 callq 0x51129
/tmp/tmp.CcCjFxHOMN.o: file format elf64-x86-64
Disassembly of section .text:
0000000000000000 <.text>: 0: 48 8b 7d 40 mov 0x40(%rbp),%rdi 4: 31 f6 xor %esi,%esi 6: ba 80 00 00 00 mov $0x80,%edx b: 48 83 c7 18 add $0x18,%rdi f: e8 6b ae 0d 00 callq 0xdae7f 14: 48 rex.W
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