[Cc'ing Andrew just in case he was going to send the offending patch on to Linus soon ...] On Wed, 27 Feb 2013 14:23:51 +0100 Sedat Dilek <sedat.dilek@xxxxxxxxx> wrote: > > On Tue, Feb 26, 2013 at 10:39 AM, Sedat Dilek <sedat.dilek@xxxxxxxxx> wrote: > > On Mon, Feb 25, 2013 at 2:44 PM, Sedat Dilek <sedat.dilek@xxxxxxxxx> wrote: > >> > >> With today's Linux-Next I see multiple call-traces pointing to perf > >> issues (excerpt, for full dmesg see attachments): > >> > >> [ 0.093651] Call Trace: > >> [ 0.093656] [<ffffffff8112a808>] perf_event_alloc+0x358/0x490 > >> [ 0.093661] [<ffffffff810ec230>] ? touch_nmi_watchdog+0x80/0x80 > >> [ 0.093666] [<ffffffff8112ac6e>] perf_event_create_kernel_counter+0x2e/0xe0 > >> [ 0.093670] [<ffffffff810ec3ed>] watchdog_enable+0xfd/0x1e0 > >> [ 0.093676] [<ffffffff81087a3c>] smpboot_thread_fn+0x9c/0x170 > >> [ 0.093681] [<ffffffff810879a0>] ? lg_global_lock+0x70/0x70 > >> [ 0.093685] [<ffffffff8107fb80>] kthread+0xc0/0xd0 > >> [ 0.093689] [<ffffffff8107fac0>] ? flush_kthread_worker+0xb0/0xb0 > >> [ 0.093694] [<ffffffff816cc56c>] ret_from_fork+0x7c/0xb0 > >> [ 0.093698] [<ffffffff8107fac0>] ? flush_kthread_worker+0xb0/0xb0 > >> [ 0.093700] Code: 54 49 89 fc 48 c7 c7 c0 6d f5 81 53 48 83 ec 18 > >> e8 e4 a5 f5 ff 41 8b b4 24 a0 00 00 00 41 89 c5 48 8b 05 a2 c9 e2 00 > >> 89 f2 30 d2 <3b> 10 74 4a 48 c7 c7 80 6d f5 81 e8 ce ab 22 00 48 89 c3 > >> 48 85 > >> [ 0.093736] RIP [<ffffffff8112a3e2>] perf_init_event+0x32/0x100 > >> [ 0.093740] RSP <ffff880119b93d58> > >> [ 0.093742] CR2: 0000000000000000 > >> [ 0.093746] ---[ end trace 941ac4690a5bae9e ]--- > >> [ 0.104659] Disabled fast string operations > >> [ 0.106781] Brought up 4 CPUs > >> [ 0.106785] BUG: unable to handle kernel NULL pointer dereference > >> at (null) > >> [ 0.106790] IP: [<ffffffff8112a3e2>] perf_init_event+0x32/0x100 > >> [ 0.106791] PGD 0 > >> [ 0.106794] Oops: 0000 [#4] SMP > >> [ 0.106795] Modules linked in: > >> [ 0.106798] CPU 3 > >> [ 0.106798] Pid: 22, comm: watchdog/3 Tainted: G D > >> 3.8.0-next20130225-1-iniza-small #1 SAMSUNG ELECTRONICS CO., LTD. > >> 530U3BI/530U4BI/530U4BH/530U3BI/530U4BI/530U4BH > >> [ 0.106801] RIP: 0010:[<ffffffff8112a3e2>] [<ffffffff8112a3e2>] > >> perf_init_event+0x32/0x100 > >> ... > >> > >> Regards, > >> - Sedat - > > > > I see the same call-traces with today's Linux-Next (next-20130226)! > > Any hints/help? > > > > - Sedat - > > [ CC Tejun and Borislav ] > > This turned out to be a idr issue [1]. Thanks Borislav for his help. > > Reverting "idr: implement lookup hint" commit [2] makes the call-traces go away. > > - Sedat - > > [1] http://marc.info/?l=linux-kernel&m=136197056415722&w=2 > [2] http://git.kernel.org/?p=linux/kernel/git/next/linux-next.git;a=commit;h=29cf29e1fbb875019713eb55cf27ec35f1e5fa5e -- Cheers, Stephen Rothwell sfr@xxxxxxxxxxxxxxxx
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