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Date: Fri, 08 Apr 2016 15:44:04 +0200 From: Mike Galbraith <umgwanakikbuti@...il.com> To: Sebastian Andrzej Siewior <bigeasy@...utronix.de> Cc: Thomas Gleixner <tglx@...utronix.de>, linux-rt-users@...r.kernel.org, linux-kernel@...r.kernel.org, Steven Rostedt <rostedt@...dmis.org>, Peter Zijlstra <a.p.zijlstra@...llo.nl> Subject: Re: [PATCH RT 4/6] rt/locking: Reenable migration accross schedule On Thu, 2016-04-07 at 18:47 +0200, Sebastian Andrzej Siewior wrote: > just to be clear: The patch I attached did _not_ work for you. Did you perchance mean with "Reenable migration across schedule" reverted? Figured it would still explode in seconds.. it did. [ 172.996232] kernel BUG at kernel/locking/rtmutex.c:1360! [ 172.996234] invalid opcode: 0000 [#1] PREEMPT SMP [ 172.996236] Dumping ftrace buffer: [ 172.996239] (ftrace buffer empty) [ 172.996254] Modules linked in: ebtable_filter(E) ebtables(E) fuse(E) nf_log_ipv6(E) xt_pkttype(E) xt_physdev(E) br_netfilter(E) nf_log_ipv4(E) nf_log_common(E) xt_LOG(E) xt_limit(E) af_packet(E) bridge(E) stp(E) llc(E) iscsi_ibft(E) iscsi_boot_sysfs(E) ip6t_REJECT(E) xt_tcpudp(E) nf_conntrack_ipv6(E) nf_defrag_ipv6(E) ip6table_raw(E) ipt_REJECT(E) iptable_raw(E) xt_CT(E) iptable_filter(E) ip6table_mangle(E) nf_conntrack_netbios_ns(E) nf_conntrack_broadcast(E) nf_conntrack_ipv4(E) nf_defrag_ipv4(E) ip_tables(E) xt_conntrack(E) nf_conntrack(E) ip6table_filter(E) ip6_tables(E) x_tables(E) nls_iso8859_1(E) nls_cp437(E) vfat(E) fat(E) intel_rapl(E) intel_powerclamp(E) coretemp(E) kvm_intel(E) kvm(E) irqbypass(E) crct10dif_pclmul(E) crc32_pclmul(E) crc32c_intel(E) snd_hda_codec_hdmi(E) snd_hda_codec_realtek(E) [ 172.996271] snd_hda_codec_generic(E) drbg(E) snd_hda_intel(E) ansi_cprng(E) snd_hda_codec(E) snd_hda_core(E) snd_hwdep(E) aesni_intel(E) snd_pcm(E) aes_x86_64(E) lrw(E) r8169(E) mii(E) snd_timer(E) gf128mul(E) dm_mod(E) iTCO_wdt(E) iTCO_vendor_support(E) lpc_ich(E) mei_me(E) shpchp(E) snd(E) i2c_i801(E) joydev(E) pcspkr(E) serio_raw(E) glue_helper(E) ablk_helper(E) mei(E) mfd_core(E) cryptd(E) soundcore(E) nfsd(E) auth_rpcgss(E) nfs_acl(E) lockd(E) grace(E) processor(E) thermal(E) battery(E) fan(E) tpm_infineon(E) fjes(E) intel_smartconnect(E) sunrpc(E) efivarfs(E) ext4(E) crc16(E) mbcache(E) jbd2(E) sr_mod(E) cdrom(E) sd_mod(E) hid_logitech_hidpp(E) hid_logitech_dj(E) hid_generic(E) uas(E) usb_storage(E) usbhid(E) nouveau(E) wmi(E) i2c_algo_bit(E) drm_kms_helper(E) syscopyarea(E) sysfillrect(E) [ 172.996275] ahci(E) sysimgblt(E) fb_sys_fops(E) libahci(E) ttm(E) libata(E) drm(E) video(E) button(E) sg(E) scsi_mod(E) autofs4(E) [ 172.996277] CPU: 7 PID: 6109 Comm: futex_wait Tainted: G E 4.4.6-rt13-virgin #12 [ 172.996277] Hardware name: MEDION MS-7848/MS-7848, BIOS M7848W08.20C 09/23/2013 [ 172.996278] task: ffff88017ce6ab80 ti: ffff8803d2e20000 task.ti: ffff8803d2e20000 [ 172.996283] RIP: 0010:[<ffffffff810b5a23>] [<ffffffff810b5a23>] task_blocks_on_rt_mutex+0x243/0x260 [ 172.996284] RSP: 0018:ffff8803d2e23a38 EFLAGS: 00010092 [ 172.996285] RAX: ffff8803d2e23c10 RBX: ffff88017ce6ab80 RCX: 0000000000000000 [ 172.996285] RDX: 0000000000000001 RSI: ffff8803d2e23a98 RDI: ffff88017ce6b258 [ 172.996286] RBP: ffff8803d2e23a68 R08: ffff8800dddc0000 R09: ffffffff81f33918 [ 172.996286] R10: ffff8800dddc0001 R11: 0000000000000000 R12: ffff8800dddc0000 [ 172.996287] R13: ffff8803d2e23a98 R14: ffffffff81f33900 R15: 0000000000000000 [ 172.996288] FS: 00007f4017988700(0000) GS:ffff88041edc0000(0000) knlGS:0000000000000000 [ 172.996288] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 172.996289] CR2: 0000000000000000 CR3: 00000003bf7f4000 CR4: 00000000001406e0 [ 172.996289] Stack: [ 172.996291] 000000007ce6abe8 ffffffff81f33900 ffff8803d2e23a98 0000000000000000 [ 172.996292] 0000000000000000 0000000000000000 ffff8803d2e23b08 ffffffff8162f105 [ 172.996293] 0000000200000000 0000000000000296 0000000000000000 ffff8803d2e23ae8 [ 172.996293] Call Trace: [ 172.996298] [<ffffffff8162f105>] rt_mutex_slowlock+0xe5/0x290 [ 172.996301] [<ffffffff810a30e5>] ? pick_next_entity+0xa5/0x160 [ 172.996303] [<ffffffff8162f3a1>] rt_mutex_lock+0x31/0x40 [ 172.996304] [<ffffffff816308ae>] _mutex_lock+0xe/0x10 [ 172.996306] [<ffffffff81096543>] migrate_me+0x63/0x1f0 [ 172.996308] [<ffffffff81093fed>] ? finish_task_switch+0x7d/0x300 [ 172.996310] [<ffffffff8106bb25>] pin_current_cpu+0x1e5/0x2a0 [ 172.996311] [<ffffffff810942e3>] migrate_disable+0x73/0xd0 [ 172.996313] [<ffffffff8162f598>] rt_spin_lock_slowlock+0x1e8/0x2e0 [ 172.996314] [<ffffffff81630748>] rt_spin_lock+0x38/0x40 [ 172.996317] [<ffffffff810ece18>] futex_wait_setup+0x98/0x100 [ 172.996318] [<ffffffff810ecfcf>] futex_wait+0x14f/0x240 [ 172.996320] [<ffffffff810b4f36>] ? rt_mutex_dequeue_pi+0x36/0x60 [ 172.996322] [<ffffffff810b5cc6>] ? rt_mutex_adjust_prio+0x36/0x40 [ 172.996323] [<ffffffff8162f714>] ? rt_spin_lock_slowunlock+0x84/0xc0 [ 172.996325] [<ffffffff810edb81>] do_futex+0xd1/0x560 [ 172.996327] [<ffffffff81003666>] ? __switch_to+0x1d6/0x450 [ 172.996329] [<ffffffff81093fed>] ? finish_task_switch+0x7d/0x300 [ 172.996330] [<ffffffff8162d40e>] ? __schedule+0x2ae/0x7d0 [ 172.996332] [<ffffffff810ee081>] SyS_futex+0x71/0x150 [ 172.996334] [<ffffffff81066123>] ? exit_to_usermode_loop+0x4b/0xe4 [ 172.996335] [<ffffffff81630c2e>] entry_SYSCALL_64_fastpath+0x12/0x71 [ 172.996349] Code: 0d 1b 54 f5 7e 74 30 65 48 8b 04 25 c4 28 01 00 48 8b 80 08 c0 ff ff f6 c4 02 75 1b b8 f5 ff ff ff e9 25 ff ff ff e8 8d f5 ff ff <0f> 0b e8 d6 b5 f4 ff e9 0e ff ff ff e8 cc b5 f4 ff b8 f5 ff ff [ 172.996351] RIP [<ffffffff810b5a23>] task_blocks_on_rt_mutex+0x243/0x260 [ 172.996351] RSP <ffff8803d2e23a38>
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