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Re: [Xen-devel] Linux 5.5 fails to boot in VM
- To: xen-devel@xxxxxxxxxxxxxxxxxxxx
- From: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>
- Date: Mon, 27 Jan 2020 19:05:23 -0500
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- Delivery-date: Tue, 28 Jan 2020 00:05:33 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 1/27/20 6:29 PM, Boris Ostrovsky
wrote:
On 1/27/20 4:37 PM, Marek
Marczykowski-Górecki wrote:
On Mon, Jan 27, 2020 at 03:45:11PM +0100, Jürgen Groß wrote:
On 27.01.20 14:16, Ilpo Järvinen wrote:
Hi,
I've noted that 5.5-rcs and now 5.5-based kernel fails to boot in VM.
5.4 based kernels worked fine and there seems to have been some changes in
drivers/xen post-5.4 so perhaps they broke something?
I can't reproduce your problem. Just booted a VM with kernel 5.5 as
PV- and as HVM-guest without any problems.
It looks like an issue with gntdev driver, so reproducing it require any
userspace that actually makes use of it. Any idea what recent change
could cause that?
Loading Linux 5.5.0-accecn30 ...
.[5;22H [ initrd.img-5.5.0-acc 16.52MiB 100% 10.23MiB/s ].[5;1HSetting up swapspace version 1, size = 1073737728 bytes
/dev/xvda3: clean, 852118/1294896 files, 3076785/5190907 blocks
[ 2.730931] BUG: kernel NULL pointer dereference, address: 00000000000003b0
[ 2.730959] #PF: supervisor read access in kernel mode
[ 2.730966] #PF: error_code(0x0000) - not-present page
[ 2.730973] PGD 0 P4D 0
[ 2.730978] Oops: 0000 [#1] SMP PTI
[ 2.730985] CPU: 1 PID: 402 Comm: qubesdb-daemon Tainted: G O 5.5.0-accecn30 #31
[ 2.731000] RIP: 0010:mmu_interval_read_begin+0x24/0xc0
This looks like it could well be
d3eeb1d77c5d0af9df442db63722928238310a86. Can you revert it and
see if it makes a difference?
(+Jason)
-boris
[ 2.731008] Code: e9 51 66 e1 ff 90 0f 1f 44 00 00 41 54 49 89 fc 55 53 48 83 ec 30 65 48 8b 04 25 28 00 00 00 48 89 44 24 28 31 c0 48 8b 47 38 <48> 8b a8 b0 03 00 00 48 8d 5d 0c 48 89 df e8 49 27 6f 00 4d 8b 64
[ 2.731030] RSP: 0018:ffff9873001e7d20 EFLAGS: 00010246
[ 2.731037] RAX: 0000000000000000 RBX: ffff8a4e94712500 RCX: 0000000000000000
I am pretty sure it is.
RAX=0 most likely means that map->notifier is NULL (assuming your
compiler generates code similar to mine).
I believe you at least need
diff --git a/drivers/xen/gntdev.c b/drivers/xen/gntdev.c
index 4fc83e3f..d35cf0b 100644
--- a/drivers/xen/gntdev.c
+++ b/drivers/xen/gntdev.c
@@ -1016,7 +1016,8 @@ static int gntdev_mmap(struct file *flip,
struct vm_area_struct *vma)
* and we are holding it now, there is no need for the
notifier_range
* locking pattern.
*/
- mmu_interval_read_begin(&map->notifier);
+ if (use_ptemod)
+ mmu_interval_read_begin(&map->notifier);
if (use_ptemod) {
map->pages_vm_start = vma->vm_start;
and maybe more. Give that a try.
-boris
[ 2.731047] RDX: ffff8a4ef53add00 RSI: 0000000000000000 RDI: ffff8a4e94712500
[ 2.731057] RBP: ffff8a4e0bf7a640 R08: 00007bc5c0573000 R09: 0000000000000008
[ 2.731066] R10: ffff8a4ec756c190 R11: 00007bc5c05a2000 R12: ffff8a4e94712500
[ 2.731076] R13: ffff8a4ed3ab9d50 R14: 0000000000000000 R15: 0000000000000001
[ 2.731086] FS: 00007bc5c00dc7c0(0000) GS:ffff8a4ef5d00000(0000) knlGS:0000000000000000
[ 2.731097] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 2.731105] CR2: 00000000000003b0 CR3: 000000008148e004 CR4: 00000000003606e0
[ 2.731116] Call Trace:
[ 2.731123] ? vma_merge+0xef/0x370
[ 2.731132] gntdev_mmap+0x153/0x30e [xen_gntdev]
[ 2.731139] mmap_region+0x3d9/0x660
[ 2.731146] do_mmap+0x372/0x520
[ 2.731153] vm_mmap_pgoff+0xd2/0x120
[ 2.731160] ksys_mmap_pgoff+0x1b8/0x270
[ 2.731167] ? ksys_ioctl+0x60/0x90
[ 2.731174] do_syscall_64+0x5b/0x180
[ 2.731182] entry_SYSCALL_64_after_hwframe+0x44/0xa9
[ 2.731191] RIP: 0033:0x7bc5c03e8133
[ 2.731196] Code: 54 41 89 d4 55 48 89 fd 53 4c 89 cb 48 85 ff 74 56 49 89 d9 45 89 f8 45 89 f2 44 89 e2 4c 89 ee 48 89 ef b8 09 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 7d 5b 5d 41 5c 41 5d 41 5e 41 5f c3 66 2e 0f
[ 2.731219] RSP: 002b:00007ffcbccc89b8 EFLAGS: 00000246 ORIG_RAX: 0000000000000009
[ 2.731230] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007bc5c03e8133
[ 2.731243] RDX: 0000000000000003 RSI: 0000000000001000 RDI: 0000000000000000
[ 2.731252] RBP: 0000000000000000 R08: 0000000000000007 R09: 0000000000000000
[ 2.731263] R10: 0000000000000001 R11: 0000000000000246 R12: 0000000000000003
[ 2.731273] R13: 0000000000001000 R14: 0000000000000001 R15: 0000000000000007
[ 2.731284] Modules linked in: xen_netback u2mfn(O) xen_gntdev xen_gntalloc xen_blkback xen_evtchn parport_pc ppdev xenfs xen_privcmd lp parport ip_tables xen_netfront xen_blkfront crc32c_intel
[ 2.731309] CR2: 00000000000003b0
[ 2.731315] fbcon: Taking over console
[ 2.731321] ---[ end trace 5ec57aa3f3a40247 ]---
[ 2.731329] RIP: 0010:mmu_interval_read_begin+0x24/0xc0
[ 2.731336] Code: e9 51 66 e1 ff 90 0f 1f 44 00 00 41 54 49 89 fc 55 53 48 83 ec 30 65 48 8b 04 25 28 00 00 00 48 89 44 24 28 31 c0 48 8b 47 38 <48> 8b a8 b0 03 00 00 48 8d 5d 0c 48 89 df e8 49 27 6f 00 4d 8b 64
[ 2.731358] RSP: 0018:ffff9873001e7d20 EFLAGS: 00010246
[ 2.731365] RAX: 0000000000000000 RBX: ffff8a4e94712500 RCX: 0000000000000000
[ 2.731375] RDX: ffff8a4ef53add00 RSI: 0000000000000000 RDI: ffff8a4e94712500
[ 2.731385] RBP: ffff8a4e0bf7a640 R08: 00007bc5c0573000 R09: 0000000000000008
[ 2.731395] R10: ffff8a4ec756c190 R11: 00007bc5c05a2000 R12: ffff8a4e94712500
[ 2.731405] R13: ffff8a4ed3ab9d50 R14: 0000000000000000 R15: 0000000000000001
[ 2.731415] FS: 00007bc5c00dc7c0(0000) GS:ffff8a4ef5d00000(0000) knlGS:0000000000000000
[ 2.731427] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 2.731436] CR2: 00000000000003b0 CR3: 000000008148e004 CR4: 00000000003606e0
[ 2.731446] Kernel panic - not syncing: Fatal exception
[ 2.731527] Kernel Offset: 0x2a000000 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffffbfffffff)
--
i.
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