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Date: Tue, 3 Sep 2019 15:27:32 +0100
From: Alessio Balsini <balsini@...roid.com>
To: Peter Zijlstra <peterz@...radead.org>
Cc: mingo@...nel.org, juri.lelli@...hat.com,
linux-kernel@...r.kernel.org, dietmar.eggemann@....com,
luca.abeni@...tannapisa.it, bristot@...hat.com, dvyukov@...gle.com,
tglx@...utronix.de, vpillai@...italocean.com, rostedt@...dmis.org
Subject: Re: [RFC][PATCH 00/13] SCHED_DEADLINE server infrastructure
Hi Peter,
While testing your series (peterz/sched/wip-deadline 7a9e91d3fe951), I ended up
in a panic at boot on a x86_64 kvm guest, would you please have a look? Here
attached the backtrace.
Happy to test any suggestion that fixes the issue.
Thanks,
Alessio
---
------>8------
[ 0.798326] ------------[ cut here ]------------
[ 0.798328] kernel BUG at kernel/sched/deadline.c:1542!
[ 0.798335] invalid opcode: 0000 [#1] SMP PTI
[ 0.798339] CPU: 4 PID: 0 Comm: swapper/4 Not tainted 5.3.0-rc6+ #28
[ 0.798340] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014
[ 0.798349] RIP: 0010:enqueue_dl_entity+0x3f8/0x440
[ 0.798351] Code: ff 48 8b 85 60 0a 00 00 8b 48 28 85 c9 0f 85 99 fd ff ff c7 40 28 01 00 00 00 e9 8d fd ff ff 85 c0 75 20 f
[ 0.798353] RSP: 0000:ffffb68e40154f10 EFLAGS: 00010096
[ 0.798356] RAX: 0000000000000020 RBX: ffff974bc74d0c00 RCX: ffff974bc751b200
[ 0.798358] RDX: 0000000000000001 RSI: ffff974bc7929410 RDI: ffff974bc7929410
[ 0.798359] RBP: 0000000000000009 R08: 00000000a73eb274 R09: 00000000000f4887
[ 0.798361] R10: 0000000000000000 R11: 0000000000000000 R12: ffff974bc74d0c80
[ 0.798362] R13: 0000000000000000 R14: ffff974bc74d0d00 R15: 0000000000000000
[ 0.798365] FS: 0000000000000000(0000) GS:ffff974bc7900000(0000) knlGS:0000000000000000
[ 0.798371] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 0.798372] CR2: 00000000ffffffff CR3: 000000000480a000 CR4: 00000000000006e0
[ 0.798374] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 0.798375] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 0.798376] Call Trace:
[ 0.798397] <IRQ>
[ 0.798402] enqueue_task_fair+0xe69/0x11d0
[ 0.798407] activate_task+0x58/0x90
[ 0.798412] ? kvm_sched_clock_read+0xd/0x20
[ 0.798416] ttwu_do_activate.isra.96+0x3a/0x50
[ 0.798420] sched_ttwu_pending+0x5e/0x90
[ 0.798424] scheduler_ipi+0x9f/0x120
[ 0.798430] reschedule_interrupt+0xf/0x20
[ 0.798432] </IRQ>
[ 0.798436] RIP: 0010:default_idle+0x20/0x140
[ 0.798438] Code: 90 90 90 90 90 90 90 90 90 90 41 55 41 54 55 65 8b 2d f4 40 d7 70 53 0f 1f 44 00 00 e9 07 00 00 00 0f 00 5
[ 0.798440] RSP: 0000:ffffb68e40083ec0 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff02
[ 0.798442] RAX: ffffffff8f29c250 RBX: 0000000000000004 RCX: ffff974bc7916000
[ 0.798444] RDX: 0000000000000001 RSI: 0000000000000000 RDI: ffff974bc791ca80
[ 0.798445] RBP: 0000000000000004 R08: 000000009d74022b R09: 0000004d7ebb5820
[ 0.798447] R10: 0000000000000400 R11: 0000000000000400 R12: 0000000000000000
[ 0.798448] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
[ 0.798451] ? __cpuidle_text_start+0x8/0x8
[ 0.798455] do_idle+0x19e/0x210
[ 0.798458] cpu_startup_entry+0x14/0x20
[ 0.798464] start_secondary+0x144/0x170
[ 0.798467] secondary_startup_64+0xa4/0xb0
[ 0.798469] Modules linked in:
[ 0.798478] ---[ end trace c2be7729c78a55ad ]---
[ 0.798482] RIP: 0010:enqueue_dl_entity+0x3f8/0x440
[ 0.798484] Code: ff 48 8b 85 60 0a 00 00 8b 48 28 85 c9 0f 85 99 fd ff ff c7 40 28 01 00 00 00 e9 8d fd ff ff 85 c0 75 20 f
[ 0.798485] RSP: 0000:ffffb68e40154f10 EFLAGS: 00010096
[ 0.798487] RAX: 0000000000000020 RBX: ffff974bc74d0c00 RCX: ffff974bc751b200
[ 0.798489] RDX: 0000000000000001 RSI: ffff974bc7929410 RDI: ffff974bc7929410
[ 0.798490] RBP: 0000000000000009 R08: 00000000a73eb274 R09: 00000000000f4887
[ 0.798491] R10: 0000000000000000 R11: 0000000000000000 R12: ffff974bc74d0c80
[ 0.798493] R13: 0000000000000000 R14: ffff974bc74d0d00 R15: 0000000000000000
[ 0.798495] FS: 0000000000000000(0000) GS:ffff974bc7900000(0000) knlGS:0000000000000000
[ 0.798500] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 0.798501] CR2: 00000000ffffffff CR3: 000000000480a000 CR4: 00000000000006e0
[ 0.798502] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 0.798504] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 0.798505] Kernel panic - not syncing: Fatal exception in interrupt
[ 0.799522] Kernel Offset: 0xd800000 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffffbfffffff)
[ 0.875144] ---[ end Kernel panic - not syncing: Fatal exception in interrupt ]---
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