On 08/24/2018 12:55 AM, Dave Jiang wrote:
I am not able to reproduce when I booted my test system with "mem=8G memmap=4G!8G". I ended up with a single pmem:
The issue seems to be related to specific machines, If you need any other debug log, please tell me. Best Regards, Rong Chen
[ 57.750556] nd_pmem namespace0.0: unable to guarantee persistence of writes [ 57.881573] pmem0: detected capacity change from 0 to 4294967296 However in the reported kmsg, it appears that memmap is splitting into 2 namespaces rather than providing a single one, and the first region ended up ending in the same section as start of the second region and thus triggered the warning and having the second namespace rejected. kern :warn : [ 76.646531] nd_pmem namespace0.0: unable to guarantee persistence of writes kern :info : [ 76.661660] pmem0: detected capacity change from 0 to 534773760 kern :warn : [ 76.670129] nd_pmem namespace1.0: unable to guarantee persistence of writes kern :warn : [ 76.670290] ------------[ cut here ]------------ kern :warn : [ 76.670372] nd_pmem namespace1.0: Conflicting mapping in same section On 08/22/2018 08:05 PM, kernel test robot wrote:FYI, we noticed the following commit (built with gcc-7): commit: 15d36fecd0bdc7510b70a0e5ec6671140b3fce0c ("mm: disallow mappings that conflict for devm_memremap_pages()") https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master in testcase: ndctl with following parameters: on test machine: 4 threads Intel(R) Core(TM) i3-3220 CPU @ 3.30GHz with 8G memory caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace): +----------------+------------+------------+ | | 03758dbbe2 | 15d36fecd0 | +----------------+------------+------------+ | boot_successes | 4 | 4 | +----------------+------------+------------+ kern :warn : [ 76.670496] WARNING: CPU: 2 PID: 213 at kernel/memremap.c:188 devm_memremap_pages+0x9f/0x470 kern :warn : [ 76.670665] Modules linked in: nd_pmem(O+) dax_pmem(O) device_dax(O) nd_btt(O) x86_pkg_temp_thermal intel_powerclamp coretemp snd_hda_codec_idt kvm_intel snd_hda_codec_generic kvm irqbypass crct10dif_pclmul crc32_pclmul crc32c_intel ghash_clmulni_intel cryptd nd_e820(O) pcspkr libnvdimm(O) ahci libahci nfit_test_iomap(O) libata snd_hda_intel i915 snd_hda_codec snd_hda_core snd_hwdep snd_pcm drm_kms_helper snd_timer syscopyarea sysfillrect sysimgblt fb_sys_fops snd soundcore drm video pcc_cpufreq ip_tables kern :warn : [ 76.671408] CPU: 2 PID: 213 Comm: systemd-udevd Tainted: G O 4.18.0-rc6-00155-g15d36fe #1 kern :warn : [ 76.671564] Hardware name: Hewlett-Packard p6-1451cx/2ADA, BIOS 8.15 02/05/2013 kern :warn : [ 76.671690] RIP: 0010:devm_memremap_pages+0x9f/0x470 kern :warn : [ 76.671774] Code: c6 74 78 49 8b 5f 50 48 85 db 75 04 49 8b 5f 10 4c 89 ff e8 13 77 42 00 48 89 da 48 89 c6 48 c7 c7 a8 62 0e 82 e8 51 8c eb ff <0f> 0b 49 8b be 80 00 00 00 65 ff 05 f1 59 e4 7e 48 8b 47 08 a8 03 kern :warn : [ 76.672107] RSP: 0018:ffffc9000125fad8 EFLAGS: 00010282 kern :warn : [ 76.672197] RAX: 0000000000000000 RBX: ffff8801a969e310 RCX: 0000000000000006 kern :warn : [ 76.672316] RDX: 0000000000000007 RSI: 0000000000000086 RDI: ffff8801ffd16950 kern :warn : [ 76.672434] RBP: ffff8801a98030a0 R08: 000000000000036e R09: 000000000000000a kern :warn : [ 76.672555] R10: 0000000000000000 R11: ffffffff82d6434d R12: 00000002ffffffff kern :warn : [ 76.672673] R13: 0000000000000000 R14: ffff8801a98024a0 R15: ffff8801aae09808 kern :warn : [ 76.672793] FS: 00007fae9129e8c0(0000) GS:ffff8801ffd00000(0000) knlGS:0000000000000000 kern :warn : [ 76.672929] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 kern :warn : [ 76.673026] CR2: 00007fae9127ec28 CR3: 00000001aafe8003 CR4: 00000000001606e0 kern :warn : [ 76.673145] Call Trace: kern :warn : [ 76.673199] ? devres_add+0x2f/0x40 kern :warn : [ 76.673266] pmem_attach_disk+0x542/0x6a0 [nd_pmem] kern :warn : [ 76.673354] ? kobject_release+0x69/0x1a0 kern :warn : [ 76.673431] ? nd_dax_probe+0xfc/0x120 [libnvdimm] kern :warn : [ 76.673520] nvdimm_bus_probe+0x69/0x150 [libnvdimm] kern :warn : [ 76.673608] driver_probe_device+0x2fa/0x470 kern :warn : [ 76.673685] __driver_attach+0xdc/0x100 kern :warn : [ 76.673753] ? driver_probe_device+0x470/0x470 kern :warn : [ 76.673831] bus_for_each_dev+0x76/0xc0 kern :warn : [ 76.673900] ? klist_add_tail+0x3b/0x70 kern :warn : [ 76.673968] bus_add_driver+0x161/0x260 kern :warn : [ 76.674035] ? 0xffffffffa0504000 kern :warn : [ 76.674096] driver_register+0x5b/0xe0 kern :warn : [ 76.674162] ? 0xffffffffa0504000 kern :warn : [ 76.674223] do_one_initcall+0x46/0x1e4 kern :warn : [ 76.674293] ? preempt_schedule_common+0x15/0x30 kern :warn : [ 76.674373] ? _cond_resched+0x22/0x30 kern :warn : [ 76.674442] ? kmem_cache_alloc_trace+0x3e/0x1e0 kern :warn : [ 76.674525] do_init_module+0x5b/0x203 kern :warn : [ 76.674593] load_module+0x1489/0x1b80 kern :warn : [ 76.674662] ? ima_post_read_file+0x102/0x110 kern :warn : [ 76.674741] ? __do_sys_finit_module+0xe9/0x110 kern :warn : [ 76.674820] __do_sys_finit_module+0xe9/0x110 kern :warn : [ 76.674901] do_syscall_64+0x5b/0x180 kern :warn : [ 76.674967] entry_SYSCALL_64_after_hwframe+0x44/0xa9 kern :warn : [ 76.675055] RIP: 0033:0x7fae9011b229 kern :warn : [ 76.675116] Code: 00 f3 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 3f 4c 2b 00 f7 d8 64 89 01 48 kern :warn : [ 76.675449] RSP: 002b:00007ffeb0452908 EFLAGS: 00000246 ORIG_RAX: 0000000000000139 kern :warn : [ 76.675576] RAX: ffffffffffffffda RBX: 0000557dd7cccdf0 RCX: 00007fae9011b229 kern :warn : [ 76.675696] RDX: 0000000000000000 RSI: 00007fae90a34265 RDI: 000000000000000f kern :warn : [ 76.675814] RBP: 00007fae90a34265 R08: 0000000000000000 R09: 00007ffeb0452e80 kern :warn : [ 76.675934] R10: 000000000000000f R11: 0000000000000246 R12: 0000000000000000 kern :warn : [ 76.676053] R13: 0000557dd7cde3c0 R14: 0000000000020000 R15: 0000557dd5d7dcbc kern :warn : [ 76.676175] ---[ end trace 72888cbe8943c229 ]--- To reproduce: git clonehttps://github.com/intel/lkp-tests.git cd lkp-tests bin/lkp install job.yaml # job file is attached in this email bin/lkp run job.yaml Thanks, lkp
