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From: Ira Weiny <ira.weiny@intel.com>
To: Ira Weiny <ira.weiny@intel.com>,
	Alison Schofield <alison.schofield@intel.com>,
	John Groves <john@jagalactic.com>
Cc: John Groves <John@groves.net>, Miklos Szeredi <miklos@szeredi.hu>,
	"Dan Williams" <dan.j.williams@intel.com>,
	Bernd Schubert <bschubert@ddn.com>,
	"John Groves" <jgroves@micron.com>,
	Jonathan Corbet <corbet@lwn.net>,
	Shuah Khan <skhan@linuxfoundation.org>,
	Vishal Verma <vishal.l.verma@intel.com>,
	"Dave Jiang" <dave.jiang@intel.com>,
	Matthew Wilcox <willy@infradead.org>, Jan Kara <jack@suse.cz>,
	Alexander Viro <viro@zeniv.linux.org.uk>,
	David Hildenbrand <david@kernel.org>,
	Christian Brauner <brauner@kernel.org>,
	"Darrick J . Wong" <djwong@kernel.org>,
	Randy Dunlap <rdunlap@infradead.org>,
	Jeff Layton <jlayton@kernel.org>,
	Amir Goldstein <amir73il@gmail.com>,
	Jonathan Cameron <Jonathan.Cameron@huawei.com>,
	Stefan Hajnoczi <shajnocz@redhat.com>,
	"Joanne Koong" <joannelkoong@gmail.com>,
	Josef Bacik <josef@toxicpanda.com>,
	"Bagas Sanjaya" <bagasdotme@gmail.com>,
	Chen Linxuan <chenlinxuan@uniontech.com>,
	James Morse <james.morse@arm.com>, Fuad Tabba <tabba@google.com>,
	"Sean Christopherson" <seanjc@google.com>,
	Shivank Garg <shivankg@amd.com>,
	"Ackerley Tng" <ackerleytng@google.com>,
	Gregory Price <gourry@gourry.net>,
	"Aravind Ramesh" <arramesh@micron.com>,
	Ajay Joshi <ajayjoshi@micron.com>,
	"venkataravis@micron.com" <venkataravis@micron.com>,
	"linux-doc@vger.kernel.org" <linux-doc@vger.kernel.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"nvdimm@lists.linux.dev" <nvdimm@lists.linux.dev>,
	"linux-cxl@vger.kernel.org" <linux-cxl@vger.kernel.org>,
	"linux-fsdevel@vger.kernel.org" <linux-fsdevel@vger.kernel.org>
Subject: Re: [PATCH V10 0/8] dax: prepare for famfs
Date: Mon, 13 Apr 2026 16:40:59 -0500	[thread overview]
Message-ID: <69dd62eba432e_20039100b5@iweiny-mobl.notmuch> (raw)
In-Reply-To: <69dd576924b0f_24f910029@iweiny-mobl.notmuch>

Ira Weiny wrote:
> Alison Schofield wrote:
> > On Fri, Mar 27, 2026 at 09:03:26PM +0000, John Groves wrote:
> > > From: John Groves <john@groves.net>
> > > 

[snip]

> > > 
> > > Description:
> > > 
> > > This patch series introduces the required dax support for famfs.
> > > Previous versions of the famfs series included both dax and fuse patches.
> > > This series separates them into separate patch series' (and the fuse
> > > series dependends on this dax series).
> > > 
> > > The famfs user space code can be found at [1]
> > > 
> > > Dax Overview:
> > > 
> > > This series introduces a new "famfs mode" of devdax, whose driver is
> > > drivers/dax/fsdev.c. This driver supports dax_iomap_rw() and
> > > dax_iomap_fault() calls against a character dax instance. A dax device
> > > now can be converted among three modes: 'system-ram', 'devdax' and
> > > 'famfs' via daxctl or sysfs (e.g. unbind devdax and bind famfs instead).
> > > 
> > > In famfs mode, a dax device initializes its pages consistent with the
> > > fsdaxmode of pmem. Raw read/write/mmap are not supported in this mode,
> > > but famfs is happy in this mode - using dax_iomap_rw() for read/write and
> > > dax_iomap_fault() for mmap faults.
> > > 
> > 
> > Here's what I found:
> > 
> > famfs-v10 on 7.0-rc5 + ndctl v84:
> > 	dax suite all pass 13/13, so no regression appears
> > 
> > famfs-v10 on 7.0-rc5 +
> > (ndctl v84 w https://github.com/jagalactic/ndctl/tree/famfs
> > top 3 patches + edit daxctl-famfs.sh to use cxl-test:
> > 
> > 	existing dax suite keeps passing
> > 	daxctl-famfs.sh oops w the new test at # Restore original mode"
> > 	seems easy to repoduce, maybe cannot go back to system-ram???
> 
> John have you been able to reproduce this?
> 
> Ira

John I've found a different crash with the daxctl-famfs.sh test.  See
below.

I got the ndctl repo with the test from Alison.

I'm not at all clear what is happening at this point...

Ira

<crash>

[  519.007691] BUG: TASK stack guard page was hit at ffffc90001767fc8 (stack is ffffc90001768000..ffffc9000176c000)
[  519.007694] Oops: stack guard page: 0000 [#1] SMP NOPTI
[  519.007697] CPU: 0 UID: 0 PID: 1465 Comm: daxctl Tainted: G           O        7.0.0-rc6ira+ #68 PREEMPT(full)
[  519.007699] Tainted: [O]=OOT_MODULE
[  519.007700] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS edk2-20250812-19.fc42 08/12/2025
[  519.007701] RIP: 0010:sprintf+0xc/0x50
[  519.007709] Code: 24 10 e8 37 f8 ff ff c9 c3 cc cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 55 48 89 e5 48 83 ec 48 48 8d 45 10 <48>
 89 54 24 28 48 89 f2 be ff ff ff 7f 48 89 4c 24 30 48 89 e1 48
[  519.007710] RSP: 0018:ffffc90001767fd0 EFLAGS: 00010282
[  519.007712] RAX: ffffc90001768028 RBX: ffffc90001768068 RCX: 0000000000001e08
[  519.007712] RDX: 0000000000000207 RSI: ffffffff82abab1c RDI: ffffc90001768068
[  519.007713] RBP: ffffc90001768018 R08: 0000000000000000 R09: 0000000000000001
[  519.007713] R10: ffffc90001768110 R11: 0000000000000002 R12: 0000000000000800
[  519.007714] R13: ffffc90001768068 R14: 0000000000000000 R15: ffffffff839c71c0
[  519.007715] FS:  00007fb94b807c80(0000) GS:ffff8880f9e9c000(0000) knlGS:0000000000000000
[  519.007717] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  519.007717] CR2: ffffc90001767fc8 CR3: 0000000077d2e005 CR4: 0000000000770ef0
[  519.007720] PKRU: 55555554
[  519.007721] Call Trace:
[  519.007722]  <TASK>
[  519.007723]  info_print_prefix+0xc0/0xe0
[  519.007728]  record_print_text+0x58/0x2d0
[  519.007730]  printk_get_next_message+0xd8/0x220
[  519.007733]  console_flush_one_record+0x1a5/0x390
[  519.007735]  console_unlock+0x5a/0xe0
[  519.007737]  vprintk_emit+0x2e8/0x340
[  519.007738]  _printk+0x48/0x50
[  519.007741]  ? printk_get_next_message+0x70/0x220
[  519.007743]  __dump_page.cold+0x3c/0x331
[  519.007746]  ? dump_page+0x1b/0x30
[  519.007748]  dump_page+0x1b/0x30
[  519.007749]  __get_pfnblock_flags_mask+0x6c/0xe0
[  519.007751]  get_pfnblock_migratetype+0xa/0x20
[  519.007753]  __dump_page.cold+0x1c6/0x331
[  519.007755]  ? dump_page+0x1b/0x30
[  519.007756]  dump_page+0x1b/0x30
[  519.007756]  __get_pfnblock_flags_mask+0x6c/0xe0
[  519.007757]  get_pfnblock_migratetype+0xa/0x20
[  519.007758]  __dump_page.cold+0x1c6/0x331
[  519.007760]  ? dump_page+0x1b/0x30
[  519.007761]  dump_page+0x1b/0x30
[  519.007761]  __get_pfnblock_flags_mask+0x6c/0xe0
[  519.007762]  get_pfnblock_migratetype+0xa/0x20
[  519.007763]  __dump_page.cold+0x1c6/0x331
[  519.007765]  ? dump_page+0x1b/0x30
[  519.007765]  dump_page+0x1b/0x30
[  519.007766]  __get_pfnblock_flags_mask+0x6c/0xe0
[  519.007767]  get_pfnblock_migratetype+0xa/0x20
[  519.007772]  __dump_page.cold+0x1c6/0x331
[  519.007774]  ? dump_page+0x1b/0x30
[  519.007775]  dump_page+0x1b/0x30
[  519.007775]  __get_pfnblock_flags_mask+0x6c/0xe0
[  519.007776]  get_pfnblock_migratetype+0xa/0x20
[  519.007777]  __dump_page.cold+0x1c6/0x331
[  519.007779]  ? dump_page+0x1b/0x30
[  519.007780]  dump_page+0x1b/0x30
[  519.007780]  __get_pfnblock_flags_mask+0x6c/0xe0
[  519.007781]  get_pfnblock_migratetype+0xa/0x20
[  519.007782]  __dump_page.cold+0x1c6/0x331
[  519.007784]  ? dump_page+0x1b/0x30
[  519.007785]  dump_page+0x1b/0x30
[  519.007785]  __get_pfnblock_flags_mask+0x6c/0xe0
[  519.007786]  get_pfnblock_migratetype+0xa/0x20
[  519.007787]  __dump_page.cold+0x1c6/0x331
[  519.007789]  ? dump_page+0x1b/0x30
[  519.007790]  dump_page+0x1b/0x30
[  519.007790]  __get_pfnblock_flags_mask+0x6c/0xe0
[  519.007791]  get_pfnblock_migratetype+0xa/0x20
[  519.007792]  __dump_page.cold+0x1c6/0x331
[  519.007794]  ? dump_page+0x1b/0x30
[  519.007795]  dump_page+0x1b/0x30
[  519.007795]  __get_pfnblock_flags_mask+0x6c/0xe0
[  519.007796]  get_pfnblock_migratetype+0xa/0x20
[  519.007797]  __dump_page.cold+0x1c6/0x331
[  519.007799]  ? dump_page+0x1b/0x30
[  519.007800]  dump_page+0x1b/0x30
[  519.007800]  __get_pfnblock_flags_mask+0x6c/0xe0
[  519.007801]  get_pfnblock_migratetype+0xa/0x20
[  519.007802]  __dump_page.cold+0x1c6/0x331
[  519.007804]  ? dump_page+0x1b/0x30
[  519.007805]  dump_page+0x1b/0x30
[  519.007808]  __get_pfnblock_flags_mask+0x6c/0xe0
[  519.007809]  get_pfnblock_migratetype+0xa/0x20
[  519.007810]  __dump_page.cold+0x1c6/0x331
[  519.007812]  ? dump_page+0x1b/0x30
[  519.007813]  dump_page+0x1b/0x30
[  519.007813]  __get_pfnblock_flags_mask+0x6c/0xe0
[  519.007814]  get_pfnblock_migratetype+0xa/0x20
[  519.007815]  __dump_page.cold+0x1c6/0x331
[  519.007817]  ? dump_page+0x1b/0x30
[  519.007818]  dump_page+0x1b/0x30
[  519.007818]  __get_pfnblock_flags_mask+0x6c/0xe0
[  519.007819]  get_pfnblock_migratetype+0xa/0x20
[  519.007820]  __dump_page.cold+0x1c6/0x331
[  519.007822]  ? dump_page+0x1b/0x30
[  519.007823]  dump_page+0x1b/0x30
[  519.007824]  __get_pfnblock_flags_mask+0x6c/0xe0
[  519.007824]  get_pfnblock_migratetype+0xa/0x20
[  519.007825]  __dump_page.cold+0x1c6/0x331
[  519.007827]  ? dump_page+0x1b/0x30
[  519.007828]  dump_page+0x1b/0x30
[  519.007829]  __get_pfnblock_flags_mask+0x6c/0xe0
[  519.007829]  get_pfnblock_migratetype+0xa/0x20
[  519.007830]  __dump_page.cold+0x1c6/0x331
[  519.007833]  ? dump_page+0x1b/0x30
[  519.007833]  dump_page+0x1b/0x30
[  519.007834]  __get_pfnblock_flags_mask+0x6c/0xe0
[  519.007834]  get_pfnblock_migratetype+0xa/0x20
[  519.007835]  __dump_page.cold+0x1c6/0x331
[  519.007838]  ? dump_page+0x1b/0x30
[  519.007838]  dump_page+0x1b/0x30
[  519.007839]  __get_pfnblock_flags_mask+0x6c/0xe0
[  519.007840]  get_pfnblock_migratetype+0xa/0x20
[  519.007841]  __dump_page.cold+0x1c6/0x331
[  519.007843]  ? dump_page+0x1b/0x30
[  519.007843]  dump_page+0x1b/0x30
[  519.007844]  __get_pfnblock_flags_mask+0x6c/0xe0
[  519.007845]  get_pfnblock_migratetype+0xa/0x20
[  519.007846]  __dump_page.cold+0x1c6/0x331
[  519.007848]  ? dump_page+0x1b/0x30
[  519.007849]  dump_page+0x1b/0x30
[  519.007849]  __get_pfnblock_flags_mask+0x6c/0xe0
[  519.007850]  get_pfnblock_migratetype+0xa/0x20
[  519.007851]  __dump_page.cold+0x1c6/0x331
[  519.007853]  ? dump_page+0x1b/0x30
[  519.007854]  dump_page+0x1b/0x30
[  519.007854]  __get_pfnblock_flags_mask+0x6c/0xe0
[  519.007855]  get_pfnblock_migratetype+0xa/0x20
[  519.007856]  __dump_page.cold+0x1c6/0x331
[  519.007858]  ? dump_page+0x1b/0x30
[  519.007859]  dump_page+0x1b/0x30
[  519.007859]  __get_pfnblock_flags_mask+0x6c/0xe0
[  519.007860]  get_pfnblock_migratetype+0xa/0x20
[  519.007861]  __dump_page.cold+0x1c6/0x331
[  519.007863]  ? dump_page+0x1b/0x30
[  519.007864]  dump_page+0x1b/0x30
[  519.007864]  __get_pfnblock_flags_mask+0x6c/0xe0
[  519.007865]  get_pfnblock_migratetype+0xa/0x20
[  519.007866]  __dump_page.cold+0x1c6/0x331
[  519.007868]  ? dump_page+0x1b/0x30
[  519.007869]  dump_page+0x1b/0x30
[  519.007869]  __get_pfnblock_flags_mask+0x6c/0xe0
[  519.007870]  get_pfnblock_migratetype+0xa/0x20
[  519.007871]  __dump_page.cold+0x1c6/0x331
[  519.007873]  ? dump_page+0x1b/0x30
[  519.007874]  dump_page+0x1b/0x30
[  519.007874]  __get_pfnblock_flags_mask+0x6c/0xe0
[  519.007875]  get_pfnblock_migratetype+0xa/0x20
[  519.007876]  __dump_page.cold+0x1c6/0x331
[  519.007878]  ? dump_page+0x1b/0x30
[  519.007879]  dump_page+0x1b/0x30
[  519.007880]  __get_pfnblock_flags_mask+0x6c/0xe0
[  519.007880]  get_pfnblock_migratetype+0xa/0x20
[  519.007881]  __dump_page.cold+0x1c6/0x331
[  519.007883]  ? dump_page+0x1b/0x30
[  519.007884]  dump_page+0x1b/0x30
[  519.007885]  __get_pfnblock_flags_mask+0x6c/0xe0
[  519.007885]  get_pfnblock_migratetype+0xa/0x20
[  519.007886]  __dump_page.cold+0x1c6/0x331
[  519.007889]  ? dump_page+0x1b/0x30
[  519.007889]  dump_page+0x1b/0x30
[  519.007890]  __get_pfnblock_flags_mask+0x6c/0xe0
[  519.007890]  get_pfnblock_migratetype+0xa/0x20
[  519.007891]  __dump_page.cold+0x1c6/0x331
[  519.007894]  ? dump_page+0x1b/0x30
[  519.007894]  dump_page+0x1b/0x30
[  519.007895]  __get_pfnblock_flags_mask+0x6c/0xe0
[  519.007895]  get_pfnblock_migratetype+0xa/0x20
[  519.007896]  __dump_page.cold+0x1c6/0x331
[  519.007899]  ? dump_page+0x1b/0x30
[  519.007899]  dump_page+0x1b/0x30
[  519.007900]  __get_pfnblock_flags_mask+0x6c/0xe0
[  519.007900]  get_pfnblock_migratetype+0xa/0x20
[  519.007901]  __dump_page.cold+0x1c6/0x331
[  519.007904]  ? dump_page+0x1b/0x30
[  519.007904]  dump_page+0x1b/0x30
[  519.007905]  __get_pfnblock_flags_mask+0x6c/0xe0
[  519.007905]  get_pfnblock_migratetype+0xa/0x20
[  519.007906]  __dump_page.cold+0x1c6/0x331
[  519.007907]  ? do_file_open+0xbe/0x150
[  519.007910]  ? stack_depot_save_flags+0x24/0x910
[  519.007918]  ? dump_page+0x1b/0x30
[  519.007919]  dump_page+0x1b/0x30
[  519.007920]  memmap_init_range+0x2f6/0x310
[  519.007922]  move_pfn_range_to_zone+0xee/0x220
[  519.007924]  mhp_init_memmap_on_memory+0x23/0xb0
[  519.007926]  memory_subsys_online+0x122/0x1a0
[  519.007929]  device_online+0x49/0x80
[  519.007931]  state_store+0x8e/0xa0
[  519.007932]  kernfs_fop_write_iter+0x136/0x1f0
[  519.007935]  vfs_write+0x205/0x460
[  519.007937]  ksys_write+0x57/0xd0
[  519.007938]  do_syscall_64+0x106/0x5f0
[  519.007940]  ? irqentry_exit+0x6c/0x520
[  519.007941]  ? exc_page_fault+0x66/0x180
[  519.007942]  entry_SYSCALL_64_after_hwframe+0x76/0x7e
[  519.007944] RIP: 0033:0x7fb94ba3473e
[  519.007946] Code: 4d 89 d8 e8 d4 bc 00 00 4c 8b 5d f8 41 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 11 c9 c3 0f 1f 80 00 00 00 00 48 8b 45 10 0f 05 <c9>
 c3 83 e2 39 83 fa 08 75 e7 e8 13 ff ff ff 0f 1f 00 f3 0f 1e fa
[  519.007946] RSP: 002b:00007fff47c8ddd0 EFLAGS: 00000202 ORIG_RAX: 0000000000000001
[  519.007948] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fb94ba3473e
[  519.007948] RDX: 000000000000000f RSI: 00007fb94bc21a3e RDI: 0000000000000004
[  519.007949] RBP: 00007fff47c8dde0 R08: 0000000000000000 R09: 0000000000000000
[  519.007949] R10: 0000000000000000 R11: 0000000000000202 R12: 00007fff47c8e3f8
[  519.007950] R13: 0000000000000006 R14: 00007fb94bc67000 R15: 0000000000413d88
[  519.007951]  </TASK>
[  519.007951] Modules linked in: cxl_test(O) cxl_acpi(O) device_dax(O) fsdev_dax kmem nd_pmem(O) nd_btt(O) cxl_pmu dax_cxl dax_pmem(O) cxl_pci nd_e820
(O) nfit(O) cxl_mock_mem(O) cxl_pmem(O) cxl_mem(O) cxl_port(O) cxl_mock(O) libnvdimm(O) nfit_test_iomap(O) cxl_core(O) fwctl [last unloaded: cxl_acpi(O
)]
[  519.007962] ---[ end trace 0000000000000000 ]---
[  519.007963] RIP: 0010:sprintf+0xc/0x50
[  519.007964] Code: 24 10 e8 37 f8 ff ff c9 c3 cc cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 55 48 89 e5 48 83 ec 48 48 8d 45 10 <48>
 89 54 24 28 48 89 f2 be ff ff ff 7f 48 89 4c 24 30 48 89 e1 48
[  519.007965] RSP: 0018:ffffc90001767fd0 EFLAGS: 00010282
[  519.007966] RAX: ffffc90001768028 RBX: ffffc90001768068 RCX: 0000000000001e08
[  519.007966] RDX: 0000000000000207 RSI: ffffffff82abab1c RDI: ffffc90001768068
[  519.007967] RBP: ffffc90001768018 R08: 0000000000000000 R09: 0000000000000001
[  519.007967] R10: ffffc90001768110 R11: 0000000000000002 R12: 0000000000000800
[  519.007967] R13: ffffc90001768068 R14: 0000000000000000 R15: ffffffff839c71c0
[  519.007968] FS:  00007fb94b807c80(0000) GS:ffff8880f9e9c000(0000) knlGS:0000000000000000
[  519.007969] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  519.007969] CR2: ffffc90001767fc8 CR3: 0000000077d2e005 CR4: 0000000000770ef0
[  519.007971] PKRU: 55555554
[  519.007972] Kernel panic - not syncing: Fatal exception in interrupt
[  519.008404] Kernel Offset: disabled
[  519.083400] ---[ end Kernel panic - not syncing: Fatal exception in interrupt ]---

  parent reply	other threads:[~2026-04-13 21:37 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <20260327210311.79099-1-john@jagalactic.com>
2026-03-27 21:03 ` [PATCH V10 0/8] dax: prepare for famfs John Groves
2026-03-27 21:04   ` [PATCH V10 1/8] dax: move dax_pgoff_to_phys from [drivers/dax/] device.c to bus.c John Groves
2026-03-27 21:04   ` [PATCH V10 2/8] dax: Factor out dax_folio_reset_order() helper John Groves
2026-03-27 21:04   ` [PATCH V10 3/8] dax: add fsdev.c driver for fs-dax on character dax John Groves
2026-03-27 21:04   ` [PATCH V10 4/8] dax: Save the kva from memremap John Groves
2026-03-27 21:04   ` [PATCH V10 5/8] dax: Add dax_operations for use by fs-dax on fsdev dax John Groves
2026-03-27 21:05   ` [PATCH V10 6/8] dax: Add dax_set_ops() for setting dax_operations at bind time John Groves
2026-03-27 21:05   ` [PATCH V10 7/8] dax: Add fs_dax_get() func to prepare dax for fs-dax usage John Groves
2026-03-27 21:05   ` [PATCH V10 8/8] dax: export dax_dev_get() John Groves
2026-03-30 21:21   ` [PATCH V10 0/8] dax: prepare for famfs Alison Schofield
2026-04-13 20:51     ` Ira Weiny
2026-04-13 21:37       ` Ira Weiny
2026-04-13 21:40       ` Ira Weiny [this message]
2026-04-13 22:26         ` John Groves
2026-04-13 22:22       ` John Groves
2026-04-13 22:41     ` Alison Schofield

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