On Thu, 25 Sep 2014, Cong Wang wrote: > On Wed, Sep 24, 2014 at 9:59 PM, Vince Weaver <vincent.wea...@maine.edu> > wrote:
> > Now that just might mean the patch pushed the code around enough so my > > test doesn't trigger, but there is hope that maybe this fixes things. > > I read this as it fixes your crash as well? It makes a testcase I have stop triggering an instant reboot, but there have been various attempts to fix similar problems over the past few months and so far the general family of lockups/reboots still remains. I'll have to start fuzzing with 3.17-rc7 and see if things are better now, but it can take days to trigger this class of bugs. > Sure, as I said in the changelog, it is a soft lockup which was triggered on > dozens of machines here, it is actually pretty straightforward: so you managed to trigger it with the perf utility? Do you have the exact command line that triggered it? Thanks, Vince > [5108912.562963] BUG: soft lockup - CPU#7 stuck for 22s! [perf:13856] > [5108912.563173] Modules linked in: netconsole configfs ipv6 bonding > dm_multipath video sbs sbshc hed acpi_pad acpi_memhotplug acpi_ipmi > parport_pc lp parport tcp_diag inet_diag ipmi_si ipmi_devintf > ipmi_msghandler dell_rbu igb dcdbas shpchp i2c_i801 i2c_core iTCO_wdt > i7core_edac edac_core iTCO_vendor_support ioatdma dca microcode > [5108912.563198] CPU 7 > [5108912.563199] Modules linked in: netconsole configfs ipv6 bonding > dm_multipath video sbs sbshc hed acpi_pad acpi_memhotplug acpi_ipmi > parport_pc lp parport tcp_diag inet_diag ipmi_si ipmi_devintf > ipmi_msghandler dell_rbu igb dcdbas shpchp i2c_i801 i2c_core iTCO_wdt > i7core_edac edac_core iTCO_vendor_support ioatdma dca microcode > [5108912.563216] > [5108912.563219] Pid: 13856, comm: perf Not tainted 3.4.78 #1 Dell > Inc. C6100 /0D61XP > [5108912.563222] RIP: 0010:[<ffffffff810d9a6a>] [<ffffffff810d9a6a>] > perf_remove_from_context+0x8d/0xb4 > [5108912.563233] RSP: 0018:ffff8809ea39bd48 EFLAGS: 00000202 > [5108912.563235] RAX: 000000000000006d RBX: ffffffff810d6dcc RCX: > 0000000000000000 > [5108912.563237] RDX: ffff88123fc8006d RSI: ffffffff810d6dcc RDI: > ffff8808f8541c0c > [5108912.563239] RBP: ffff8809ea39bd88 R08: 0000000000000001 R09: > 0000000000000000 > [5108912.563241] R10: ffff8809abf95610 R11: ffff880a3a6c331c R12: > 0000000000000000 > [5108912.563243] R13: 00000000000000ef R14: 0000000000000001 R15: > 0000000000000000 > [5108912.563245] FS: 0000000000000000(0000) GS:ffff88123fc20000(0000) > knlGS:0000000000000000 > [5108912.563248] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > [5108912.563250] CR2: 00007f692e787180 CR3: 0000000001a0b000 CR4: > 00000000000007e0 > [5108912.563252] DR0: 0000000000000000 DR1: 0000000000000000 DR2: > 0000000000000000 > [5108912.563254] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: > 0000000000000400 > [5108912.563256] Process perf (pid: 13856, threadinfo > ffff8809ea39a000, task ffff880a2167c470) > [5108912.563258] Stack: > [5108912.563260] ffff880a3a6c32c0 ffff88048c7c3820 ffff8809ea39bd88 > ffff88048c7c3800 > [5108912.563265] ffff88048c7c3800 ffff8808f8541c00 ffff8808f8541c10 > ffff88091b56c000 > [5108912.563269] ffff8809ea39bdb8 ffffffff810d9bbe ffff8809ea39bdb8 > ffff880a2167c470 > [5108912.563273] Call Trace: > [5108912.563278] [<ffffffff810d9bbe>] perf_event_release_kernel+0x77/0x91 > [5108912.563282] [<ffffffff810d9c56>] put_event+0x7e/0x86 > [5108912.563285] [<ffffffff810d9dc0>] perf_release+0x10/0x14 > [5108912.563291] [<ffffffff8112dfc0>] __fput+0xfe/0x1f6 > [5108912.563294] [<ffffffff8112e0d2>] fput+0x1a/0x1c > [5108912.563297] [<ffffffff8112ad8d>] filp_close+0x72/0x7d > [5108912.563303] [<ffffffff8103efbf>] put_files_struct+0x6c/0xc3 > [5108912.563306] [<ffffffff8103f057>] exit_files+0x41/0x46 > [5108912.563309] [<ffffffff81040971>] do_exit+0x292/0x3b6 > [5108912.563312] [<ffffffff81040b12>] do_group_exit+0x7d/0xa5 > [5108912.563315] [<ffffffff81040b51>] sys_exit_group+0x17/0x1b > [5108912.563320] [<ffffffff814c2469>] system_call_fastpath+0x16/0x1b -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
