[Xen-devel] pv kernel panic xen 4.4 unstable with large number of vcpus and default max_event_channel

[Elena Ufimtseva <ufimtseva@xxxxxxxxx>]

Hi

pv kernel crashes when starting guest with vcpus above 150 with latest
linux kernel. WIth increase of max_event_channel it boots (I tried
4096).


[    0.387911] ------------[ cut here ]------------
[    0.387918] kernel BUG at drivers/xen/events.c:909!
[    0.387922] invalid opcode: 0000 [#1] SMP
[    0.387928] Modules linked in:
[    0.387934] CPU: 0 PID: 1 Comm: swapper/0 Tainted: G        W    3.12.0+ #95
[    0.387940] task: ffff880088ecb080 ti: ffff880088ecc000 task.ti:
ffff880088ecc000
[    0.387945] RIP: e030:[<ffffffff8126b310>]  [<ffffffff8126b310>]
bind_ipi_to_irqhandler+0x9c/0x15d
[    0.387959] RSP: e02b:ffff880088ecdd18  EFLAGS: 00010286
[    0.387963] RAX: ffffffffffffffe4 RBX: 000000000000040d RCX: 0000000000000007
[    0.387968] RDX: 0000000000000001 RSI: 00000000deadbeef RDI: 00000000deadbeef
[    0.387972] RBP: 0000000000000091 R08: ffff880089003d70 R09: ffff880088ecdd50
[    0.387977] R10: 0000000000001f00 R11: 0000000000000001 R12: 0000000000000091
[    0.387982] R13: 0000000000000091 R14: 0000000000010b20 R15: 0000000000000004
[    0.387990] FS:  0000000000000000(0000) GS:ffff880089400000(0000)
knlGS:0000000000000000
[    0.387996] CS:  e033 DS: 0000 ES: 0000 CR0: 0000000080050033
[    0.388000] CR2: 0000000000000000 CR3: 000000000160c000 CR4: 0000000000042660
[    0.388000] Stack:
[    0.388000]  0000000000000091 0000000000000091 ffffffff8100bc33
0000000000000c20
[    0.388000]  ffff880168c88760 0000000000000000 ffff880088ecdd98
ffff880000000091
[    0.388000]  ffff880088ecddb4 ffff88008c468000 0000000000000091
0000000000000091
[    0.388000] Call Trace:
[    0.388000]  [<ffffffff8100bc33>] ? xen_hvm_cpu_up+0x53/0x53
[    0.388000]  [<ffffffff8100bba0>] ? xen_smp_intr_init+0x1be/0x1fe
[    0.388000]  [<ffffffff8100c17c>] ? xen_cpu_up+0x308/0x35d
[    0.388000]  [<ffffffff81047532>] ? _cpu_up+0xc1/0x120
[    0.388000]  [<ffffffff8104765f>] ? cpu_up+0xce/0xe2
[    0.388000]  [<ffffffff816e79f5>] ? smp_init+0x56/0x70
[    0.388000]  [<ffffffff816c8e22>] ? kernel_init_freeable+0xc4/0x1eb
[    0.388000]  [<ffffffff813b34cc>] ? rest_init+0x70/0x70
[    0.388000]  [<ffffffff813b34d2>] ? kernel_init+0x6/0xd3
[    0.388000]  [<ffffffff813c860c>] ? ret_from_fork+0x7c/0xb0
[    0.388000]  [<ffffffff813b34cc>] ? rest_init+0x70/0x70
[    0.388000] Code: 81 48 c7 c2 bb 4c 08 81 48 c7 c6 20 d6 6a 81 e8
ad 96 e1 ff 48 8d 74 24 38 bf 07 00 00 00 89 6c 24 38 e8 c9 ea ff ff
85 c0 74 02 <0f> 0b 44 8b 64 24 3c 89 df e8 80 ea ff ff 89 de 48 89 c7
ba 03
[    0.388000] RIP  [<ffffffff8126b310>] bind_ipi_to_irqhandler+0x9c/0x15d
[    0.388000]  RSP <ffff880088ecdd18>
[    0.388005] ---[ end trace 8347cf354b5857c5 ]---
[    0.388026] Kernel panic - not syncing: Attempted to kill init!
exitcode=0x0000000b
[    0.388026]


-- 
Elena

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