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[Xen-users] PROBLEM: Kernel BUG with raid5 soft + Xen + DRBD - invalid opcode

Hello Guys, I've having some trouble on a new system I'm setting up. I'm getting a kernel BUG message, seems to be related with the use of Xen (when I boot the system _without_ Xen, I don't get any crash). Here is configuration : - 3x Hard Drives running on RAID 5 Software raid created by mdadm - On top of it, DRBD for replication over another node (Active/passive cluster) - On top of it, a BTRFS FileSystem with a few subvolumes - On top of it, XEN VMs running. The BUG is happening when I'm making "huge" I/O (20MB/s with a rsync for example) on the RAID5 stack. I've to reset system to make it work again. Reproducible : ALWAYS (making the i/o, it crash in 2-5mins). Also reproducible on another system with the same hardware. Kernel versions impacted (at least): kernel-4.4.26, kernel-4.8.15, kernel-4.9.0 Here dmesg errors : [ 937.123220] ------------[ cut here ]------------ [ 937.127549] kernel BUG at drivers/md/raid5.c:527! [ 937.131891] invalid opcode: 0000 [#1] SMP [ 937.136216] Modules linked in: x86_pkg_temp_thermal coretemp crc32c_intel aesni_intel aes_x86_64 ablk_helper mei_me mei mpt3sas [ 937.145665] CPU: 2 PID: 9704 Comm: kworker/u16:8 Not tainted 4.9.0-gentoo #2 [ 937.150293] Hardware name: Supermicro Super Server/X10SDV-4C-7TP4F, BIOS 1.0b 11/21/2016 [ 937.155531] Workqueue: drbd0_submit do_submit [ 937.160506] task: ffff88026b0b2940 task.stack: ffffc9000a66c000 [ 937.164115] RIP: e030:[<ffffffff819e1fc1>] [<ffffffff819e1fc1>] raid5_get_active_stripe+0x5e1/0x670 [ 937.169584] RSP: e02b:ffffc9000a66fa58 EFLAGS: 00010086 [ 937.175070] RAX: 0000000000000000 RBX: ffff880249d50000 RCX: ffff8802648bb5d0 [ 937.180640] RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffff880249d50000 [ 937.185505] RBP: ffffc9000a66faf0 R08: ffff8801f4813288 R09: 0000000000000000 [ 937.190631] R10: 0000000000000288 R11: 0000000000000000 R12: 0000000000000000 [ 937.196030] R13: 000000001e773e88 R14: ffff880249d50000 R15: ffff8802648bb400 [ 937.202011] FS: 0000000000000000(0000) GS:ffff880270c80000(0000) knlGS:ffff880270c80000 [ 937.206628] CS: e033 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 937.212372] CR2: 00007f68a101b520 CR3: 0000000257875000 CR4: 0000000000042660 [ 937.217538] Stack: [ 937.223361] ffff8802648bb400 ffff880269550b40 0000000000000000 0000000166cf3800 [ 937.229103] 000000001e773e88 ffff8802648bb5d0 0000000000000001 0000000000000000 [ 937.233707] ffff8802648bb40c 0000000000000001 ffffc9000a66faf0 ffff880047cba958 [ 937.239736] Call Trace: [ 937.244406] [<ffffffff819e21cd>] raid5_make_request+0x17d/0xdf0 [ 937.250345] [<ffffffff810bcfb0>] ? wake_up_atomic_t+0x30/0x30 [ 937.256173] [<ffffffff81a09c03>] md_make_request+0xe3/0x220 [ 937.261031] [<ffffffff81483e9b>] generic_make_request+0xcb/0x1a0 [ 937.265615] [<ffffffff81732537>] drbd_send_and_submit+0x497/0x1310 [ 937.271605] [<ffffffff810bcfb0>] ? wake_up_atomic_t+0x30/0x30 [ 937.276726] [<ffffffff817339ba>] send_and_submit_pending+0x6a/0x90 [ 937.282292] [<ffffffff81733e43>] do_submit+0x463/0x550 [ 937.288333] [<ffffffff810bcfb0>] ? wake_up_atomic_t+0x30/0x30 [ 937.293205] [<ffffffff81095400>] process_one_work+0x170/0x420 [ 937.298982] [<ffffffff810957d3>] worker_thread+0x123/0x500 [ 937.304154] [<ffffffff810956b0>] ? process_one_work+0x420/0x420 [ 937.310314] [<ffffffff810956b0>] ? process_one_work+0x420/0x420 [ 937.316013] [<ffffffff8109b135>] kthread+0xc5/0xe0 [ 937.320918] [<ffffffff8102c815>] ? __switch_to+0x355/0x7a0 [ 937.327029] [<ffffffff8109b070>] ? kthread_park+0x60/0x60 [ 937.331994] [<ffffffff81ccbbc5>] ret_from_fork+0x25/0x30 [ 937.338068] Code: 85 d0 fb ff ff f0 41 80 8f 98 02 00 00 04 e9 c2 fb ff ff f3 90 41 8b 47 70 a8 01 75 f6 89 45 a4 e9 e2 fd ff ff 0f 0b 0f 0b 0f 0b <0f> 0b 49 89 d6 e9 e1 fa ff ff 49 8b 82 e8 01 00 00 4d 8b 8a e0 [ 937.349579] RIP [<ffffffff819e1fc1>] raid5_get_active_stripe+0x5e1/0x670 [ 937.355290] RSP <ffffc9000a66fa58> [ 937.386587] ---[ end trace b870be01f61065a5 ]--- [ 941.931453] BUG: unable to handle kernel NULL pointer dereference at (null) [ 941.937139] IP: [<ffffffff810bcaa6>] __wake_up_common+0x26/0x80 [ 941.943106] PGD 252dde067 [ 941.943219] PUD 252ee7067 [ 941.950107] PMD 0 [ 941.956080] Oops: 0000 [#2] SMP [ 941.961919] Modules linked in: x86_pkg_temp_thermal coretemp crc32c_intel aesni_intel aes_x86_64 ablk_helper mei_me mei mpt3sas [ 941.974933] CPU: 2 PID: 9704 Comm: kworker/u16:8 Tainted: G D 4.9.0-gentoo #2 [ 941.982080] Hardware name: Supermicro Super Server/X10SDV-4C-7TP4F, BIOS 1.0b 11/21/2016 [ 941.989296] task: ffff88026b0b2940 task.stack: ffffc9000a66c000 [ 941.996831] RIP: e030:[<ffffffff810bcaa6>] [<ffffffff810bcaa6>] __wake_up_common+0x26/0x80 [ 942.004391] RSP: e02b:ffffc9000a66fe50 EFLAGS: 00010086 [ 942.011818] RAX: 0000000000000200 RBX: ffffc9000a66ff18 RCX: 0000000000000000 [ 942.019290] RDX: 0000000000000000 RSI: 0000000000000003 RDI: ffffc9000a66ff18 [ 942.026779] RBP: ffffc9000a66fe88 R08: 0000000000000000 R09: 0000000000000000 [ 942.034246] R10: 0000000000000008 R11: 0000000000000001 R12: ffffc9000a66ff20 [ 942.041693] R13: 0000000000000200 R14: 0000000000000000 R15: 0000000000000003 [ 942.049166] FS: 0000000000000000(0000) GS:ffff880270c80000(0000) knlGS:ffff880270c80000 [ 942.056599] CS: e033 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 942.063953] CR2: 0000000000000028 CR3: 0000000257875000 CR4: 0000000000042660 [ 942.070841] kernel tried to execute NX-protected page - exploit attempt? (uid: 0) [ 942.074862] BUG: unable to handle kernel paging request at ffffc9000234f8f8 [ 942.078910] IP: [<ffffc9000234f8f8>] 0xffffc9000234f8f8 [ 942.082961] PGD 1e9840067 [ 942.083010] PUD 1e983f067 [ 942.086963] PMD 26b42c067 [ 942.086978] PTE 801000026b66c067 [ 942.094822] Oops: 0011 [#3] SMP [ 942.098734] Modules linked in: x86_pkg_temp_thermal coretemp crc32c_intel aesni_intel aes_x86_64 ablk_helper mei_me mei mpt3sas [ 942.107222] CPU: 2 PID: 9704 Comm: kworker/u16:8 Tainted: G D 4.9.0-gentoo #2 [ 942.111581] Hardware name: Supermicro Super Server/X10SDV-4C-7TP4F, BIOS 1.0b 11/21/2016 [ 942.116050] task: ffff88026b0b2940 task.stack: ffffc9000a66c000 [ 942.120530] RIP: e030:[<ffffc9000234f8f8>] [<ffffc9000234f8f8>] 0xffffc9000234f8f8 [ 942.125019] RSP: e02b:ffffc9000a66fb80 EFLAGS: 00010082 [ 942.129534] RAX: 0000000000000041 RBX: 0000000000042660 RCX: 0000000000000006 [ 942.134355] RDX: 0000000000000041 RSI: ffffffff824e00a0 RDI: ffff880270c8dd80 [ 942.138921] RBP: ffffc9000a66fbe0 R08: 0000000000000000 R09: 0000000000000000 [ 942.143564] R10: 0000000000000008 R11: 0000000000000001 R12: 0000000080050033 [ 942.148172] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 942.152837] FS: 0000000000000000(0000) GS:ffff880270c80000(0000) knlGS:ffff880270c80000 [ 942.157525] CS: e033 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 942.162213] CR2: 0000000000000028 CR3: 0000000257875000 CR4: 0000000000042660 [ 942.166954] Stack: [ 942.171576] 0000000257875000 0000000000000028 ffff880270c80000 ffff880270c80000 [ 942.176267] 0000000000000000 0000e0330a66c000 0000000000000000 ffffc9000a66fda8 [ 942.180918] 0000000000000000 ffffc9000a66fda8 0000000000000000 0000000000000000 [ 942.185521] Call Trace: [ 942.190043] [<ffffffff810302ad>] show_regs+0x2d/0x180 [ 942.194605] [<ffffffff81030725>] __die+0xa5/0xf0 [ 942.199050] [<ffffffff8106041e>] no_context+0x14e/0x3d0 [ 942.203562] [<ffffffff81060798>] __bad_area_nosemaphore+0xf8/0x1c0 [ 942.208002] [<ffffffff8106086f>] bad_area_nosemaphore+0xf/0x20 [ 942.212478] [<ffffffff81061034>] __do_page_fault+0x84/0x4b0 [ 942.216797] [<ffffffff8106148c>] do_page_fault+0x2c/0x40 [ 942.221021] [<ffffffff81ccd808>] page_fault+0x28/0x30 [ 942.225184] [<ffffffff810bcaa6>] ? __wake_up_common+0x26/0x80 [ 942.229287] [<ffffffff810bcb0e>] __wake_up_locked+0xe/0x10 [ 942.233366] [<ffffffff810bd4d2>] complete+0x32/0x50 [ 942.237330] [<ffffffff8107a500>] mm_release+0xc0/0x160 [ 942.241216] [<ffffffff81080206>] do_exit+0x136/0xb50 [ 942.245056] [<ffffffff81ccdc07>] rewind_stack_do_exit+0x17/0x20 [ 942.248933] Code: c9 ff ff c0 cf 74 b7 01 88 ff ff 00 30 cf 66 02 88 ff ff 00 00 00 00 00 00 00 00 40 29 57 6b 02 88 ff ff b0 cf 0b 81 ff ff ff ff <70> fb 66 0a 00 c9 ff ff 88 b6 8b 64 02 88 ff ff 00 00 00 00 01 [ 942.257683] RIP [<ffffc9000234f8f8>] 0xffffc9000234f8f8 [ 942.261814] RSP <ffffc9000a66fb80> [ 942.265860] CR2: ffffc9000234f8f8 [ 942.269830] ---[ end trace b870be01f61065a6 ]--- [ 942.293603] Fixing recursive fault but reboot is needed! [ 962.926746] INFO: rcu_sched detected stalls on CPUs/tasks: [ 962.930582] 4-...: (1 GPs behind) idle=deb/140000000000000/0 softirq=51234/51234 fqs=5195 [ 962.934400] (detected by 1, t=21002 jiffies, g=26732, c=26731, q=173) [ 962.938231] Task dump for CPU 4: [ 962.942054] md10_raid5 R running task 13232 2654 2 0x00000008 [ 962.945939] ffff880270d0dcc0 ffff880270ed8ec0 000000000306bc88 0000000000000000 [ 962.949899] 0000000000000220 ffff8802648bb40c 0000000000000002 ffff8802648bb708 [ 962.953781] 0000000000000001 ffffc9000306bcc8 ffffffff81ccb884 ffff8802648bb400 [ 962.957570] Call Trace: [ 962.961272] [<ffffffff81ccb884>] ? _raw_spin_lock_irqsave+0x54/0x60 [ 962.964943] [<ffffffff819d87f4>] ? release_inactive_stripe_list+0x44/0x180 [ 962.968604] [<ffffffff819e5469>] ? handle_active_stripes.isra.56+0x169/0x440 [ 962.972253] [<ffffffff819e5ae1>] ? raid5d+0x3a1/0x730 [ 962.975825] [<ffffffff81a094d3>] ? md_thread+0xf3/0x100 [ 962.979360] [<ffffffff810bcfb0>] ? wake_up_atomic_t+0x30/0x30 [ 962.982900] [<ffffffff81a093e0>] ? find_pers+0x70/0x70 [ 962.986392] [<ffffffff8109b135>] ? kthread+0xc5/0xe0 [ 962.989881] [<ffffffff8102c815>] ? __switch_to+0x355/0x7a0 [ 962.993382] [<ffffffff8109b070>] ? kthread_park+0x60/0x60 [ 962.996858] [<ffffffff81ccbbc5>] ? ret_from_fork+0x25/0x30 [ 1025.932534] INFO: rcu_sched detected stalls on CPUs/tasks: [ 1025.936027] 4-...: (1 GPs behind) idle=deb/140000000000000/0 softirq=51234/51234 fqs=20780 [ 1025.939486] (detected by 0, t=84014 jiffies, g=26732, c=26731, q=742) [ 1025.942969] Task dump for CPU 4: [ 1025.946373] md10_raid5 R running task 13232 2654 2 0x00000008 [ 1025.949909] ffff880270d0dcc0 ffff880270ed8ec0 000000000306bc88 0000000000000000 [ 1025.953451] 0000000000000220 ffff8802648bb40c 0000000000000002 ffff8802648bb708 [ 1025.957015] 0000000000000001 ffffc9000306bcc8 ffffffff81ccb884 ffff8802648bb400 [ 1025.960601] Call Trace: [ 1025.964139] [<ffffffff81ccb884>] ? _raw_spin_lock_irqsave+0x54/0x60 [ 1025.967724] [<ffffffff819d87f4>] ? release_inactive_stripe_list+0x44/0x180 [ 1025.971351] [<ffffffff819e5469>] ? handle_active_stripes.isra.56+0x169/0x440 [ 1025.975001] [<ffffffff819e5ae1>] ? raid5d+0x3a1/0x730 [ 1025.978598] [<ffffffff81a094d3>] ? md_thread+0xf3/0x100 [ 1025.982255] [<ffffffff810bcfb0>] ? wake_up_atomic_t+0x30/0x30 [ 1025.985875] [<ffffffff81a093e0>] ? find_pers+0x70/0x70 [ 1025.989496] [<ffffffff8109b135>] ? kthread+0xc5/0xe0 [ 1025.993117] [<ffffffff8102c815>] ? __switch_to+0x355/0x7a0 [ 1025.996707] [<ffffffff8109b070>] ? kthread_park+0x60/0x60 [ 1026.000354] [<ffffffff81ccbbc5>] ? ret_from_fork+0x25/0x30 [ 1088.937436] INFO: rcu_sched detected stalls on CPUs/tasks: [ 1088.941109] 4-...: (1 GPs behind) idle=deb/140000000000000/0 softirq=51234/51234 fqs=36280 [ 1088.944649] (detected by 0, t=147019 jiffies, g=26732, c=26731, q=1328) [ 1088.948180] Task dump for CPU 4: [ 1088.951671] md10_raid5 R running task 13232 2654 2 0x00000008 [ 1088.955296] ffff880270d0dcc0 ffff880270ed8ec0 000000000306bc88 0000000000000000 [ 1088.958963] 0000000000000220 ffff8802648bb40c 0000000000000002 ffff8802648bb708 [ 1088.962665] 0000000000000001 ffffc9000306bcc8 ffffffff81ccb884 ffff8802648bb400 [ 1088.966301] Call Trace: [ 1088.969868] [<ffffffff81ccb884>] ? _raw_spin_lock_irqsave+0x54/0x60 [ 1088.973451] [<ffffffff819d87f4>] ? release_inactive_stripe_list+0x44/0x180 [ 1088.977020] [<ffffffff819e5469>] ? handle_active_stripes.isra.56+0x169/0x440 [ 1088.980572] [<ffffffff819e5ae1>] ? raid5d+0x3a1/0x730 [ 1088.984066] [<ffffffff81a094d3>] ? md_thread+0xf3/0x100 [ 1088.987549] [<ffffffff810bcfb0>] ? wake_up_atomic_t+0x30/0x30 [ 1088.991011] [<ffffffff81a093e0>] ? find_pers+0x70/0x70 [ 1088.994444] [<ffffffff8109b135>] ? kthread+0xc5/0xe0 [ 1088.997815] [<ffffffff8102c815>] ? __switch_to+0x355/0x7a0 [ 1089.001181] [<ffffffff8109b070>] ? kthread_park+0x60/0x60 [ 1089.004534] [<ffffffff81ccbbc5>] ? ret_from_fork+0x25/0x30 (Another log here : http://pastebin.com/maxGFc1z) Xen versions affected (at least): xen-4.6, xen-4.7, xen-4.8 xen-tools same version Userland is a gentoo linux box. Kernel .config : http://pastebin.com/p0EcHjbu All buit with : gcc (Gentoo 4.9.3 p1.5, pie-0.6.4) 4.9.3 -> scripts/ver_linux If some fields are empty or look unusual you may have an old version. Compare to the current minimal requirements in Documentation/Changes. Linux Node_1 4.9.0-gentoo #2 SMP Fri Dec 23 16:37:48 CET 2016 x86_64 Intel(R) Xeon(R) CPU D-1518 @ 2.20GHz GenuineIntel GNU/Linux GNU C 4.9.3 GNU Make 4.1 Binutils 2.25.1 Util-linux 2.26.2 Mount 2.26.2 Module-init-tools 22 E2fsprogs 1.43.3 Linux C Library 2.22 Dynamic linker (ldd) 2.22 Linux C++ Library 6.0.20 Procps 3.3.12 Net-tools 1.60 Kbd 2.0.3 Console-tools 2.0.3 Sh-utils 8.25 Udev 220 Modules Loaded ablk_helper aesni_intel aes_x86_64 coretemp crc32c_intel mei mei_me mpt3sas x86_pkg_temp_thermal -> System is a SuperMicro Motherboard X10SDV-4C-7TP4F with 8GB of DDR 4 ECC Registered memory Any help would be greatly appreciated ! 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