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Date:   Fri, 14 Feb 2020 18:03:40 -0500
From:   Jeff Moyer <jmoyer@...hat.com>
To:     Ira Weiny <ira.weiny@...el.com>
Cc:     Dan Williams <dan.j.williams@...el.com>,
        "Darrick J. Wong" <darrick.wong@...cle.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Dave Chinner <david@...morbit.com>,
        Christoph Hellwig <hch@....de>,
        "Theodore Y. Ts'o" <tytso@....edu>, Jan Kara <jack@...e.cz>,
        linux-ext4 <linux-ext4@...r.kernel.org>,
        linux-xfs <linux-xfs@...r.kernel.org>,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>
Subject: Re: [PATCH v3 00/12] Enable per-file/directory DAX operations V3

Jeff Moyer <jmoyer@...hat.com> writes:

> Hi, Ira,
>
> Jeff Moyer <jmoyer@...hat.com> writes:
>
>> I'll try to get some testing in on this series, now.
>
> This series panics in xfstests generic/013, when run like so:
>
> MKFS_OPTIONS="-m reflink=0" MOUNT_OPTIONS="-o dax" ./check -g auto
>
> I'd dig in further, but it's late on a Friday.  You understand.  :)

Sorry, I should have at least given you a clue.  Below is the stack
trace.  We're going down the buffered I/O path, even though the fs is
mounted with -o dax.  Somewhere the inode isn't getting marked properly.

-Jeff

[  549.461099] BUG: kernel NULL pointer dereference, address: 0000000000000000
[  549.468053] #PF: supervisor instruction fetch in kernel mode
[  549.473713] #PF: error_code(0x0010) - not-present page
[  549.478851] PGD 17c7e06067 P4D 17c7e06067 PUD 17c7e01067 PMD 0 
[  549.484773] Oops: 0010 [#1] SMP NOPTI
[  549.488438] CPU: 68 PID: 19851 Comm: fsstress Not tainted 5.6.0-rc1+ #42
[  549.495134] Hardware name: Intel Corporation S2600WFD/S2600WFD, BIOS SE5C620.86B.0D.01.0395.022720191340 02/27/2019
[  549.505562] RIP: 0010:0x0
[  549.508186] Code: Bad RIP value.
[  549.511418] RSP: 0018:ffffab132dc9fa98 EFLAGS: 00010246
[  549.516642] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001
[  549.523768] RDX: 0000000000000000 RSI: ffffdcf75e7060c0 RDI: ffff8c3805d22300
[  549.530900] RBP: ffffab132dc9fb08 R08: 0000000000000000 R09: 00002308a18f9f3f
[  549.538030] R10: 0000000000000000 R11: ffffdcf75f4b19c0 R12: ffff8c37cfe6d2b8
[  549.545155] R13: ffffab132dc9fb60 R14: ffffdcf75e7060c8 R15: ffffdcf75e7060c0
[  549.552288] FS:  00007f849d20cb80(0000) GS:ffff8c3821100000(0000) knlGS:0000000000000000
[  549.560373] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  549.566117] CR2: ffffffffffffffd6 CR3: 00000017d3088005 CR4: 00000000007606e0
[  549.573250] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[  549.580383] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[  549.587515] PKRU: 55555554
[  549.590228] Call Trace:
[  549.592683]  read_pages+0x120/0x190
[  549.596173]  __do_page_cache_readahead+0x1c1/0x1e0
[  549.600965]  ondemand_readahead+0x182/0x2f0
[  549.605152]  generic_file_buffered_read+0x5a6/0xaf0
[  549.610032]  ? security_inode_permission+0x30/0x50
[  549.614824]  ? _cond_resched+0x15/0x30
[  549.618620]  xfs_file_buffered_aio_read+0x47/0xe0 [xfs]
[  549.623861]  xfs_file_read_iter+0x6e/0xd0 [xfs]
[  549.628394]  generic_file_splice_read+0x100/0x220
[  549.633099]  splice_direct_to_actor+0xd5/0x220
[  549.637543]  ? pipe_to_sendpage+0xa0/0xa0
[  549.641557]  do_splice_direct+0x9a/0xd0
[  549.645396]  vfs_copy_file_range+0x153/0x320
[  549.649667]  __x64_sys_copy_file_range+0xdd/0x200
[  549.654375]  do_syscall_64+0x55/0x1d0
[  549.658039]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[  549.663091] RIP: 0033:0x7f849c7086bd
[  549.666671] Code: 00 c3 66 2e 0f 1f 84 00 00 00 00 00 90 f3 0f 1e fa 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 9b 67 2c 00 f7 d8 64 89 01 48
[  549.685414] RSP: 002b:00007fff81b78678 EFLAGS: 00000246 ORIG_RAX: 0000000000000146
[  549.692980] RAX: ffffffffffffffda RBX: 00000000000000c9 RCX: 00007f849c7086bd
[  549.700112] RDX: 0000000000000004 RSI: 00007fff81b786b0 RDI: 0000000000000003
[  549.707242] RBP: 00000000005d92ef R08: 0000000000006cb4 R09: 0000000000000000
[  549.714375] R10: 00007fff81b786b8 R11: 0000000000000246 R12: 0000000000000003
[  549.721508] R13: 0000000000006cb4 R14: 0000000000037f58 R15: 0000000000365871
[  549.728641] Modules linked in: xt_CHECKSUM nft_chain_nat xt_MASQUERADE nf_nat xt_conntrack nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 ipt_REJECT nf_reject_ipv4 nft_counter nft_compat nf_tables nfnetlink tun bridge stp llc rfkill sunrpc vfat fat intel_rapl_msr intel_rapl_common skx_edac x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel iTCO_wdt iTCO_vendor_support kvm irqbypass crct10dif_pclmul ipmi_ssif crc32_pclmul ghash_clmulni_intel intel_cstate intel_uncore mei_me ipmi_si joydev intel_rapl_perf ioatdma pcspkr ipmi_devintf sg i2c_i801 lpc_ich mei dca ipmi_msghandler dax_pmem dax_pmem_core acpi_power_meter acpi_pad xfs libcrc32c nd_pmem nd_btt sd_mod sr_mod cdrom ast i2c_algo_bit drm_vram_helper drm_ttm_helper ttm drm_kms_helper syscopyarea sysfillrect sysimgblt fb_sys_fops cec crc32c_intel i40e drm nvme ahci nvme_core libahci t10_pi libata wmi nfit libnvdimm
[  549.805384] CR2: 0000000000000000
[  549.808744] ---[ end trace 62568a4ecc43ee90 ]---

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