When systemtap probes ext4 module, the system hangs up.

Solution Verified - Updated -

Issue

  • When systemtap probes ext4 module, the system sometimes hangs up.

  • When the system hangs up, many messages are output.

    BUG: scheduling while atomic: swapper/0/0DI: 000000bad: scheduling from the idle thread!
BUG: sche<4>CR0: 8005003b CR2: b6deede0 CR3: 33c620bad: scheduling ack+0x0/0xb0 [stap_e24BUG: scheduling while atomic: swappere0 CR3: 33c620bad: scheduling from the idle thread!
BUG: 068
<4>CR0: 8005003b CR2: b6deede0 CR3: 33c620bad: schedulallback+0x0/0xb0 [stap_e24BUG: scheduling while atomic: swS2
<4>bad: scheduling from the idle thread!
bad: scheduling from the idle thread!
BUG: scheduling whil<c045007b>] ? init_exit__set_tiBUG: scheduling while atomicb>] ? init_exit__set_tiBUG: scheduling while atomic: swappeit_exit__set_tiBUG: scheduling while atomiiBUG: scheduling while atomic: swapper/0/0x00000100c: swapper/0/0x00000100
bad: scheduling from the idle thread!
BUG: scheduling while atomic: swapper/0/0x00000100
bad: scheduling from the idle thread!
BUG: scheduling while atomic: swapper/0/0x00000100

  • And, this issue crashes the kernel occasionally.

Environment

  • Red Hat Enterprise Linux 6.1

  • systemtap-1.4-4.el6

  • This problem doesn't occur on RHEL6.0.

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