From: "wcohen at redhat dot com" <sourceware-bugzilla@sourceware.org>
To: systemtap@sourceware.org
Subject: [Bug runtime/24416] New: Tests stuck in uprobes_onthefly.exp
Date: Wed, 03 Apr 2019 14:57:00 -0000 [thread overview]
Message-ID: <bug-24416-6586@http.sourceware.org/bugzilla/> (raw)
https://sourceware.org/bugzilla/show_bug.cgi?id=24416
Bug ID: 24416
Summary: Tests stuck in uprobes_onthefly.exp
Product: systemtap
Version: unspecified
Status: NEW
Severity: normal
Priority: P2
Component: runtime
Assignee: systemtap at sourceware dot org
Reporter: wcohen at redhat dot com
Target Milestone: ---
When running the "make installcheck" on multiple x86 machines running Fedora 29
and rawhide see that the tests getting stuck when running uprobes_onthefly.exp.
See multiple messages in the output of dmesg of the form from a rawhide machine
running kernel-5.0.5-300.fc30.x86_64:
[86154.130199] INFO: rcu_tasks detected stalls on tasks:
[86154.130202] 00000000c3a1580f: .. nvcsw: 0/0 holdout: 1 idle_cpu: -1/0
[86154.130204] uprobes_onthefl R running task 0 7087 25897 0x00000000
[86154.130206] Call Trace:
[86154.130212] ? __schedule+0x264/0x8a0
[86154.130213] schedule+0x32/0x70
[86154.130215] exit_to_usermode_loop+0x5c/0xd0
[86154.130217] prepare_exit_to_usermode+0x59/0x60
[86154.130218] retint_user+0x8/0x8
[86154.130220] RIP: 0033:0x40113c
[86154.130221] Code: fc 8b 45 ec 8d 14 00 8b 45 fc 01 d0 5d c3 55 48 89 e5 48
83 ec 10 89 7d fc 48 89 75 f0 8b 45 fc 89 c7 e8 cd ff ff ff 89 45 fc <eb> f1 66
90 f3 0f 1e fa 41 57 4c 8d 3d 03 2d 00 00 41 56 49 89 d6
[86154.130222] RSP: 002b:00007ffc66707c60 EFLAGS: 00000286 ORIG_RAX:
ffffffffffffff13
[86154.130223] RAX: 0000000099be4f1b RBX: 0000000000000000 RCX:
00007fe04acdc738
[86154.130223] RDX: 0000000011298a12 RSI: 00007ffc66707d58 RDI:
000000008894c509
[86154.130224] RBP: 00007ffc66707c70 R08: 00007fe04acddd80 R09:
00007fe04ad0f170
[86154.130224] R10: 0000000000000000 R11: 0000000000000022 R12:
0000000000401020
[86154.130225] R13: 00007ffc66707d50 R14: 0000000000000000 R15:
0000000000000000
Can reproduce with:
sudo make installcheck RUNTESTFLAGS="--debug
systemtap.onthefly/uprobes_onthefly.exp"
Looking at the traceback it looks like things could get stuck in
exit_to_usermode_loop if _TIF_NEED_RESCHED never gets set to zero.
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next reply other threads:[~2019-04-03 14:57 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-04-03 14:57 wcohen at redhat dot com [this message]
2019-04-03 16:11 ` [Bug runtime/24416] " wcohen at redhat dot com
2019-04-05 15:39 ` wcohen at redhat dot com
2019-04-05 16:00 ` wcohen at redhat dot com
2019-04-05 19:14 ` wcohen at redhat dot com
2019-04-05 21:25 ` wcohen at redhat dot com
2019-04-05 22:03 ` fche at redhat dot com
2019-04-08 14:10 ` wcohen at redhat dot com
2019-04-09 21:43 ` wcohen at redhat dot com
2019-04-10 21:11 ` wcohen at redhat dot com
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