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[Xen-devel] Linux 5.5 fails to boot in VM



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?


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
[    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
[    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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