[Bug runtime/19186] New: getting a 'BUG: sleeping fujnction called from invalid context' error on rawhide

[Bug runtime/19186] New: getting a 'BUG: sleeping fujnction called from invalid context' error on rawhide

[dsmith at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=19186

            Bug ID: 19186
           Summary: getting a 'BUG: sleeping fujnction called from invalid
                    context' error on rawhide
           Product: systemtap
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: runtime
          Assignee: systemtap at sourceware dot org
          Reporter: dsmith at redhat dot com
  Target Milestone: ---

When running the slowvfs.stp example script on a rawhide kernel
(4.3.0-0.rc7.git1.1.fc24.x86_64), I get the following kernel backtrace:

====
[ 2849.293562] stap_88e4cea26e1c41bc9512e34dc8172103_17592: systemtap:
3.0/0.164, base: ffffffffa0495000, memory:
172data/48text/191ctx/2058net/380alloc kb, probes: 3
[ 2849.395584] BUG: sleeping fujnction called from invalid context at
kernel/locking/mutex.c:616
[ 2849.404038] in_atomic(): 1, irqs_disabled(): 0, pid: 17600, name: modprobe  
[ 2849.410930] no locks held by modprobe/17600.
[ 2849.415223] CPU: 7 PID: 17600 Comm: modprobe Tainted: G           OE  
4.3.0-0.rc7.git1.1.fc24.x86_64 #1
[ 2849.424703] Hardware name: Intel MP Server/S5000VSA  , BIOS
S5000.86B.02.00.0054.061520062205 06/15/2006
[ 2849.434193]  0000000000000000 000000005f15d42a ffff8801341f3be8
ffffffff8141be59
[ 2849.441713]  ffff880159680000 ffff8801341f3c10 ffffffff810d72b9
ffffffff81c8b280
[ 2849.449234]  0000000000000268 0000000000000000 ffff8801341f3c38
ffffffff810d73b9
[ 2849.456762] Call Trace:
[ 2849.459238]  [<ffffffff8141be59>] dump_stack+0x4b/0x72
[ 2849.464391]  [<ffffffff810d72b9>] ___might_sleep+0x179/0x230
[ 2849.470068]  [<ffffffff810d73b9>] __might_sleep+0x49/0x80
[ 2849.475484]  [<ffffffff81860da3>] mutex_lock_nested+0x43/0x400
[ 2849.481328]  [<ffffffff81104fa9>] ? trace_hardirqs_on_caller+0x129/0x1b0
[ 2849.488050]  [<ffffffffa049aaeb>] systemtap_module_refresh+0x1b/0x180
[stap_88e4cea26e1c41bc9512e34dc8172103_17592]
[ 2849.498502]  [<ffffffffa049acae>] _stp_module_notifier+0x3e/0x190
[stap_88e4cea26e1c41bc9512e34dc8172103_17592]
[ 2849.508600]  [<ffffffffa049ae38>] _stp_module_load_tp+0x18/0x20
[stap_88e4cea26e1c41bc9512e34dc8172103_17592]
[ 2849.518533]  [<ffffffff8114e843>] load_module+0x2163/0x27d0
[ 2849.524125]  [<ffffffff8114a980>] ? __symbol_put+0x70/0x70
[ 2849.529628]  [<ffffffff810e451a>] ? sched_clock_cpu+0x8a/0xb0
[ 2849.535391]  [<ffffffff81212c0d>] ? __might_fault+0x4d/0xa0
[ 2849.540982]  [<ffffffff8114f022>] SyS_init_module+0x172/0x1b0
[ 2849.546743]  [<ffffffff81864bb2>] entry_SYSCALL_64_fastpath+0x12/0x76
====

Note that this doesn't seem to be happening 100% of the time.

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[Bug runtime/19186] getting a 'BUG: sleeping fujnction called from invalid context' error on rawhide

[dsmith at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=19186

David Smith <dsmith at redhat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |DUPLICATE

--- Comment #1 from David Smith <dsmith at redhat dot com> ---
Looks like this is a result of the changes made to fix bug #18889 (lost ability
to probe kernel module initializers). The kprobes registration function sleeps,
and you can't sleep in a tracepoint handler. We'll have to fix that bug a
different way.

*** This bug has been marked as a duplicate of bug 18889 ***

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