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Message-ID: <20180730235312.GA5089@thunk.org>
Date: Mon, 30 Jul 2018 19:53:12 -0400
From: "Theodore Y. Ts'o" <tytso@....edu>
To: Ross Zwisler <ross.zwisler@...ux.intel.com>,
Matthew Wilcox <mawilcox@...rosoft.com>
Cc: linux-nvdimm@...ts.01.org, linux-ext4@...r.kernel.org
Subject: Help trying to use /dev/pmem for dax debugging?
In newer kernels, it looks like you can't use /dev/pmem0 for DAX
unless it's marked as being DAX capable. This appears to require
CONFIG_NVDIMM_PFN. But when I tried to build a kernel with that
configured, I get the following BUG:
[ 0.000000] Linux version 4.18.0-rc4-xfstests-00031-g7c2d77aa7d80 (tytso@...c) (gcc version 7.3.0 (Debian 7.3.0-27)) #460 SMP Mon Jul 30 19:38:44 EDT 2018
[ 0.000000] Command line: systemd.show_status=auto systemd.log_level=crit root=/dev/vda console=ttyS0,115200 cmd=maint fstesttz=America/New_York fstesttyp=ext4 fstestapi=1.4 memmap=4G!9G memmap=9G!14G
...
[ 16.544707] BUG: unable to handle kernel paging request at ffffed0048000000
[ 16.546132] PGD 6bffe9067 P4D 6bffe9067 PUD 6bfbec067 PMD 0
[ 16.547174] Oops: 0000 [#1] SMP KASAN PTI
[ 16.547923] CPU: 0 PID: 81 Comm: kworker/u8:1 Not tainted 4.18.0-rc4-xfstests-00031-g7c2d77aa7d80 #460
[ 16.549706] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.11.1-1 04/01/2014
[ 16.551285] Workqueue: events_unbound async_run_entry_fn
[ 16.552309] RIP: 0010:check_memory_region+0xdd/0x190
[ 16.553264] Code: 74 0b 41 80 38 00 74 f0 4d 85 c0 75 56 4c 01 c8 49 89 e8 49 29 c0 4d 8d 48 07 4d 85 c0 4d 0f 49 c8 49 c1 f9 03 45 85 c9 74 5b <48> 83 38 00 75 18 45 8d 41 ff 4e 8d 44 c0 08 48 83 c0 08 49 39 c0
[ 16.556872] RSP: 0000:ffff8806469b6bb8 EFLAGS: 00010202
[ 16.557861] RAX: ffffed0048000000 RBX: ffff880240000fff RCX: ffffffffa8a2f9bc
[ 16.559500] RDX: 0000000000000000 RSI: 0000000000001000 RDI: ffff880240000000
[ 16.561255] RBP: ffffed0048000200 R08: 0000000000000200 R09: 0000000000000040
[ 16.563245] R10: 0000000000000200 R11: ffffed00480001ff R12: ffff880240000000
[ 16.565186] R13: dffffc0000000000 R14: fffffbfff5361562 R15: ffffea0015d34bd8
[ 16.567119] FS: 0000000000000000(0000) GS:ffff88064b600000(0000) knlGS:0000000000000000
[ 16.569331] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 16.570927] CR2: ffffed0048000000 CR3: 0000000212416001 CR4: 0000000000360ef0
[ 16.572839] Call Trace:
[ 16.573493] memcpy+0x1f/0x50
[ 16.574050] pmem_do_bvec+0x1dc/0x670
[ 16.575086] ? pmem_release_pgmap_ops+0x10/0x10
[ 16.576392] ? rcu_read_lock_sched_held+0x110/0x130
[ 16.577785] ? generic_make_request_checks+0xf87/0x1520
[ 16.579310] ? do_read_cache_page+0x219/0x8b0
[ 16.580551] pmem_make_request+0x306/0x9e0
[ 16.581714] generic_make_request+0x565/0xd30
[ 16.582947] ? mempool_alloc+0xf7/0x2d0
[ 16.584032] ? blk_plug_queued_count+0x150/0x150
[ 16.585339] ? sched_clock_cpu+0x18/0x180
[ 16.586473] ? debug_show_all_locks+0x2d0/0x2d0
[ 16.587803] ? submit_bio+0x139/0x3a0
[ 16.588864] submit_bio+0x139/0x3a0
[ 16.589896] ? lock_downgrade+0x5e0/0x5e0
[ 16.591031] ? lock_acquire+0x106/0x3e0
[ 16.592123] ? direct_make_request+0x1e0/0x1e0
[ 16.593428] ? guard_bio_eod+0x19d/0x570
[ 16.594547] submit_bh_wbc.isra.12+0x409/0x5a0
[ 16.595804] block_read_full_page+0x526/0x800
[ 16.597032] ? block_llseek+0xd0/0xd0
[ 16.598072] ? block_page_mkwrite+0x270/0x270
[ 16.599317] ? add_to_page_cache_lru+0x119/0x210
[ 16.600621] ? add_to_page_cache_locked+0x40/0x40
[ 16.601943] ? pagecache_get_page+0x44/0x6b0
[ 16.603153] do_read_cache_page+0x219/0x8b0
[ 16.604338] ? blkdev_writepages+0x10/0x10
[ 16.605500] read_dev_sector+0xbb/0x390
[ 16.606606] read_lba.isra.0+0x2f0/0x5c0
[ 16.607735] ? compare_gpts+0x1500/0x1500
[ 16.608870] ? efi_partition+0x2bc/0x1bb0
[ 16.610021] ? rcu_read_lock_sched_held+0x110/0x130
[ 16.611387] efi_partition+0x2e6/0x1bb0
[ 16.612468] ? __isolate_free_page+0x530/0x530
[ 16.613717] ? rcu_read_lock_sched_held+0x110/0x130
[ 16.615103] ? is_gpt_valid.part.1+0xdc0/0xdc0
[ 16.616396] ? string+0x14c/0x220
[ 16.617344] ? string+0x14c/0x220
[ 16.618285] ? format_decode+0x3be/0x760
[ 16.619409] ? vsnprintf+0x1ff/0x10a0
[ 16.620439] ? num_to_str+0x220/0x220
[ 16.621472] ? snprintf+0x8f/0xc0
[ 16.622411] ? vscnprintf+0x30/0x30
[ 16.623402] ? is_gpt_valid.part.1+0xdc0/0xdc0
[ 16.624650] ? check_partition+0x308/0x660
[ 16.625818] check_partition+0x308/0x660
[ 16.626966] rescan_partitions+0x187/0x8d0
[ 16.628123] ? lock_acquire+0x106/0x3e0
[ 16.629219] ? up_write+0x1d/0x150
[ 16.630185] ? bd_set_size+0x24e/0x2e0
[ 16.631244] __blkdev_get+0x696/0xfd0
[ 16.632276] ? bd_set_size+0x2e0/0x2e0
[ 16.633337] ? kvm_sched_clock_read+0x21/0x30
[ 16.634570] ? sched_clock+0x5/0x10
[ 16.635563] ? sched_clock_cpu+0x18/0x180
[ 16.636706] blkdev_get+0x28f/0x850
[ 16.637714] ? lockdep_rcu_suspicious+0x150/0x150
[ 16.639032] ? __blkdev_get+0xfd0/0xfd0
[ 16.640144] ? refcount_sub_and_test+0xcd/0x160
[ 16.641415] ? refcount_inc+0x30/0x30
[ 16.642453] ? do_raw_spin_unlock+0x144/0x220
[ 16.643680] ? kobject_put+0x50/0x410
[ 16.644711] __device_add_disk+0xbe5/0xe40
[ 16.645916] ? bdget_disk+0x60/0x60
[ 16.646919] ? alloc_dax+0x2b2/0x5b0
[ 16.647939] ? kill_dax+0x140/0x140
[ 16.648928] ? nvdimm_badblocks_populate+0x47/0x360
[ 16.649904] ? __raw_spin_lock_init+0x2d/0x100
[ 16.650720] pmem_attach_disk+0x944/0xf90
[ 16.651477] ? nd_pmem_notify+0x4a0/0x4a0
[ 16.652233] ? kfree+0xd4/0x210
[ 16.652822] ? nd_dax_probe+0x1d0/0x240
[ 16.653526] nvdimm_bus_probe+0xd4/0x370
[ 16.654261] driver_probe_device+0x56d/0xbe0
[ 16.655432] ? __driver_attach+0x2c0/0x2c0
[ 16.656548] bus_for_each_drv+0x10d/0x1a0
[ 16.657414] ? subsys_find_device_by_id+0x2e0/0x2e0
[ 16.658385] __device_attach+0x19c/0x230
[ 16.659225] ? device_bind_driver+0xa0/0xa0
[ 16.660135] ? kobject_uevent_env+0x223/0xfb0
[ 16.661072] bus_probe_device+0x1ad/0x260
[ 16.661852] ? sysfs_create_groups+0x86/0x130
[ 16.662826] device_add+0x9fe/0x1340
[ 16.663814] ? device_private_init+0x180/0x180
[ 16.664786] nd_async_device_register+0xe/0x40
[ 16.665621] async_run_entry_fn+0xc3/0x630
[ 16.666400] process_one_work+0x767/0x1670
[ 16.667221] ? debug_show_all_locks+0x2d0/0x2d0
[ 16.668137] ? pwq_dec_nr_in_flight+0x2c0/0x2c0
[ 16.669011] worker_thread+0x87/0xb90
[ 16.669730] ? __kthread_parkme+0xb6/0x180
[ 16.670515] ? process_one_work+0x1670/0x1670
[ 16.671339] kthread+0x314/0x3d0
[ 16.671963] ? kthread_flush_work_fn+0x10/0x10
[ 16.672810] ret_from_fork+0x3a/0x50
[ 16.673502] CR2: ffffed0048000000
[ 16.674436] ---[ end trace ac6b16a57e0c48ad ]---
Does this ring any bells? Any suggestions about how I get ext4 dax
testing working again? Many thanks!!
(full log and config attached below, compressed for size reasons)
- Ted
Download attachment "config.xz" of type "application/x-xz" (14084 bytes)
Download attachment "log.xz" of type "application/x-xz" (8536 bytes)
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