[Xen-devel] xen-unstable (4.14 to be): Assertion '!preempt_count()' failed at preempt.c:36

[Sander Eikelenboom <linux@xxxxxxxxxxxxxx>]

L.S.,

On current xen-unstable (4.14 to be) and AMD cpu:

After rebooting the host, while the guests are starting, I hit the assertion 
below.
xen-staging-4.13 seems fine on the same machine.

--
Sander


(XEN) [2019-12-04 17:03:25.062] grant_table.c:1808:d7v0 Expanding d7 grant 
table from 3 to 4 frames
(XEN) [2019-12-04 17:03:25.365] Assertion '!preempt_count()' failed at 
preempt.c:36
(XEN) [2019-12-04 17:03:25.365] ----[ Xen-4.14-unstable  x86_64  debug=y   Not 
tainted ]----
(XEN) [2019-12-04 17:03:25.365] CPU:    0
(XEN) [2019-12-04 17:03:25.365] RIP:    e008:[<ffff82d080224b2d>] 
ASSERT_NOT_IN_ATOMIC+0x46/0x4c
(XEN) [2019-12-04 17:03:25.365] RFLAGS: 0000000000010202   CONTEXT: hypervisor 
(d0v5)
(XEN) [2019-12-04 17:03:25.365] rax: ffff82d080597020   rbx: ffff83069fd26000   
rcx: 00000000000000a2
(XEN) [2019-12-04 17:03:25.365] rdx: 0000000000000000   rsi: ffff8306b20d38a0   
rdi: ffff83069fd55b38
(XEN) [2019-12-04 17:03:25.365] rbp: ffff8300c7c8fee8   rsp: ffff8300c7c8fee8   
r8:  deadbeefdeadf00d
(XEN) [2019-12-04 17:03:25.365] r9:  deadbeefdeadf00d   r10: 0000000000000000   
r11: 0000000000000000
(XEN) [2019-12-04 17:03:25.365] r12: 0000000000000000   r13: 0000000000000000   
r14: 0000000000000000
(XEN) [2019-12-04 17:03:25.365] r15: 0000000000000000   cr0: 0000000080050033   
cr4: 00000000000006e0
(XEN) [2019-12-04 17:03:25.365] cr3: 00000004630a3000   cr2: 00007f602bd4b4f0
(XEN) [2019-12-04 17:03:25.365] fsb: 00007f602b08cbc0   gsb: ffff88807d540000   
gss: 0000000000000000
(XEN) [2019-12-04 17:03:25.365] ds: 0000   es: 0000   fs: 0000   gs: 0000   ss: 
e010   cs: e008
(XEN) [2019-12-04 17:03:25.365] Xen code around <ffff82d080224b2d> 
(ASSERT_NOT_IN_ATOMIC+0x46/0x4c):
(XEN) [2019-12-04 17:03:25.365]  58 f6 c4 02 74 06 5d c3 <0f> 0b 0f 0b 0f 0b 55 
48 89 e5 48 8d 05 e6 24 37
(XEN) [2019-12-04 17:03:25.365] Xen stack trace from rsp=ffff8300c7c8fee8:
(XEN) [2019-12-04 17:03:25.365]    00007cff383700e7 ffff82d080385065 
0000000000000000 00007ffe22bf6d90
(XEN) [2019-12-04 17:03:25.365]    0000000000305000 00007ffe22bf6d90 
ffff88805a2d8700 ffff8880703495f0
(XEN) [2019-12-04 17:03:25.365]    0000000000000282 0000000000000000 
ffff888078435600 0000000000000000
(XEN) [2019-12-04 17:03:25.365]    0000000000000000 ffffffff8100148a 
0000000000000000 0000000000000000
(XEN) [2019-12-04 17:03:25.365]    deadbeefdeadf00d 0000010000000000 
ffffffff8100148a 000000000000e033
(XEN) [2019-12-04 17:03:25.365]    0000000000000282 ffffc90004dafd88 
000000000000e02b 003e6be50048ffe0
(XEN) [2019-12-04 17:03:25.365]    003e6d0f00094f03 003e6e0300000000 
003e699d0048ffe0 0000e01000000000
(XEN) [2019-12-04 17:03:25.365]    ffff83069fd26000 0000000000000000 
00000000000006e0 0000000000000000
(XEN) [2019-12-04 17:03:25.365]    0000000000000000 003e040000000000 
003e78f000094ea0
(XEN) [2019-12-04 17:03:25.365] Xen call trace:
(XEN) [2019-12-04 17:03:25.365]    [<ffff82d080224b2d>] R 
ASSERT_NOT_IN_ATOMIC+0x46/0x4c
(XEN) [2019-12-04 17:03:25.365]    [<ffff82d080385065>] F 
x86_64/entry.S#test_all_events+0x6/0x3d
(XEN) [2019-12-04 17:03:25.365] 
(XEN) [2019-12-04 17:03:26.089] 
(XEN) [2019-12-04 17:03:26.098] ****************************************
(XEN) [2019-12-04 17:03:26.117] Panic on CPU 0:
(XEN) [2019-12-04 17:03:26.130] Assertion '!preempt_count()' failed at 
preempt.c:36
(XEN) [2019-12-04 17:03:26.152] ****************************************
(XEN) [2019-12-04 17:03:26.171] 
(XEN) [2019-12-04 17:03:26.180] Reboot in five seconds...

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