1. 11 Jun, 2013 1 commit
  2. 06 Jun, 2013 1 commit
    • Steven Rostedt (Red Hat)'s avatar
      tracing: Use current_uid() for critical time tracing · f17a5194
      Steven Rostedt (Red Hat) authored
      The irqsoff tracer records the max time that interrupts are disabled.
      There are hooks in the assembly code that calls back into the tracer when
      interrupts are disabled or enabled.
      
      When they are enabled, the tracer checks if the amount of time they
      were disabled is larger than the previous recorded max interrupts off
      time. If it is, it creates a snapshot of the currently running trace
      to store where the last largest interrupts off time was held and how
      it happened.
      
      During testing, this RCU lockdep dump appeared:
      
      [ 1257.829021] ===============================
      [ 1257.829021] [ INFO: suspicious RCU usage. ]
      [ 1257.829021] 3.10.0-rc1-test+ #171 Tainted: G        W
      [ 1257.829021] -------------------------------
      [ 1257.829021] /home/rostedt/work/git/linux-trace.git/include/linux/rcupdate.h:780 rcu_read_lock() used illegally while idle!
      [ 1257.829021]
      [ 1257.829021] other info that might help us debug this:
      [ 1257.829021]
      [ 1257.829021]
      [ 1257.829021] RCU used illegally from idle CPU!
      [ 1257.829021] rcu_scheduler_active = 1, debug_locks = 0
      [ 1257.829021] RCU used illegally from extended quiescent state!
      [ 1257.829021] 2 locks held by trace-cmd/4831:
      [ 1257.829021]  #0:  (max_trace_lock){......}, at: [<ffffffff810e2b77>] stop_critical_timing+0x1a3/0x209
      [ 1257.829021]  #1:  (rcu_read_lock){.+.+..}, at: [<ffffffff810dae5a>] __update_max_tr+0x88/0x1ee
      [ 1257.829021]
      [ 1257.829021] stack backtrace:
      [ 1257.829021] CPU: 3 PID: 4831 Comm: trace-cmd Tainted: G        W    3.10.0-rc1-test+ #171
      [ 1257.829021] Hardware name: To Be Filled By O.E.M. To Be Filled By O.E.M./To be filled by O.E.M., BIOS SDBLI944.86P 05/08/2007
      [ 1257.829021]  0000000000000001 ffff880065f49da8 ffffffff8153dd2b ffff880065f49dd8
      [ 1257.829021]  ffffffff81092a00 ffff88006bd78680 ffff88007add7500 0000000000000003
      [ 1257.829021]  ffff88006bd78680 ffff880065f49e18 ffffffff810daebf ffffffff810dae5a
      [ 1257.829021] Call Trace:
      [ 1257.829021]  [<ffffffff8153dd2b>] dump_stack+0x19/0x1b
      [ 1257.829021]  [<ffffffff81092a00>] lockdep_rcu_suspicious+0x109/0x112
      [ 1257.829021]  [<ffffffff810daebf>] __update_max_tr+0xed/0x1ee
      [ 1257.829021]  [<ffffffff810dae5a>] ? __update_max_tr+0x88/0x1ee
      [ 1257.829021]  [<ffffffff811002b9>] ? user_enter+0xfd/0x107
      [ 1257.829021]  [<ffffffff810dbf85>] update_max_tr_single+0x11d/0x12d
      [ 1257.829021]  [<ffffffff811002b9>] ? user_enter+0xfd/0x107
      [ 1257.829021]  [<ffffffff810e2b15>] stop_critical_timing+0x141/0x209
      [ 1257.829021]  [<ffffffff8109569a>] ? trace_hardirqs_on+0xd/0xf
      [ 1257.829021]  [<ffffffff811002b9>] ? user_enter+0xfd/0x107
      [ 1257.829021]  [<ffffffff810e3057>] time_hardirqs_on+0x2a/0x2f
      [ 1257.829021]  [<ffffffff811002b9>] ? user_enter+0xfd/0x107
      [ 1257.829021]  [<ffffffff8109550c>] trace_hardirqs_on_caller+0x16/0x197
      [ 1257.829021]  [<ffffffff8109569a>] trace_hardirqs_on+0xd/0xf
      [ 1257.829021]  [<ffffffff811002b9>] user_enter+0xfd/0x107
      [ 1257.829021]  [<ffffffff810029b4>] do_notify_resume+0x92/0x97
      [ 1257.829021]  [<ffffffff8154bdca>] int_signal+0x12/0x17
      
      What happened was entering into the user code, the interrupts were enabled
      and a max interrupts off was recorded. The trace buffer was saved along with
      various information about the task: comm, pid, uid, priority, etc.
      
      The uid is recorded with task_uid(tsk). But this is a macro that uses rcu_read_lock()
      to retrieve the data, and this happened to happen where RCU is blind (user_enter).
      
      As only the preempt and irqs off tracers can have this happen, and they both
      only have the tsk == current, if tsk == current, use current_uid() instead of
      task_uid(), as current_uid() does not use RCU as only current can change its uid.
      
      This fixes the RCU suspicious splat.
      Signed-off-by: default avatarSteven Rostedt <rostedt@goodmis.org>
      f17a5194
  3. 29 May, 2013 3 commits
  4. 28 May, 2013 1 commit
  5. 23 May, 2013 1 commit
    • Steven Rostedt (Red Hat)'s avatar
      tracing: Fix crash when ftrace=nop on the kernel command line · ca164318
      Steven Rostedt (Red Hat) authored
      If ftrace=<tracer> is on the kernel command line, when that tracer is
      registered, it will be initiated by tracing_set_tracer() to execute that
      tracer.
      
      The nop tracer is just a stub tracer that is used to have no tracer
      enabled. It is assigned at early bootup as it is the default tracer.
      
      But if ftrace=nop is on the kernel command line, the registering of the
      nop tracer will call tracing_set_tracer() which will try to execute
      the nop tracer. But it expects tr->current_trace to be assigned something
      as it usually is assigned to the nop tracer. As it hasn't been assigned
      to anything yet, it causes the system to crash.
      
      The simple fix is to move the tr->current_trace = nop before registering
      the nop tracer. The functionality is still the same as the nop tracer
      doesn't do anything anyway.
      Reported-by: default avatarPeter Zijlstra <peterz@infradead.org>
      Signed-off-by: default avatarSteven Rostedt <rostedt@goodmis.org>
      ca164318
  6. 16 May, 2013 1 commit
  7. 15 May, 2013 4 commits
  8. 12 May, 2013 2 commits
    • Linus Torvalds's avatar
      Linux 3.10-rc1 · f722406f
      Linus Torvalds authored
      f722406f
    • Linus Torvalds's avatar
      Merge tag 'trace-fixes-v3.10' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace · 26b840ae
      Linus Torvalds authored
      Pull tracing/kprobes update from Steven Rostedt:
       "The majority of these changes are from Masami Hiramatsu bringing
        kprobes up to par with the latest changes to ftrace (multi buffering
        and the new function probes).
      
        He also discovered and fixed some bugs in doing so.  When pulling in
        his patches, I also found a few minor bugs as well and fixed them.
      
        This also includes a compile fix for some archs that select the ring
        buffer but not tracing.
      
        I based this off of the last patch you took from me that fixed the
        merge conflict error, as that was the commit that had all the changes
        I needed for this set of changes."
      
      * tag 'trace-fixes-v3.10' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace:
        tracing/kprobes: Support soft-mode disabling
        tracing/kprobes: Support ftrace_event_file base multibuffer
        tracing/kprobes: Pass trace_probe directly from dispatcher
        tracing/kprobes: Increment probe hit-count even if it is used by perf
        tracing/kprobes: Use bool for retprobe checker
        ftrace: Fix function probe when more than one probe is added
        ftrace: Fix the output of enabled_functions debug file
        ftrace: Fix locking in register_ftrace_function_probe()
        tracing: Add helper function trace_create_new_event() to remove duplicate code
        tracing: Modify soft-mode only if there's no other referrer
        tracing: Indicate enabled soft-mode in enable file
        tracing/kprobes: Fix to increment return event probe hit-count
        ftrace: Cleanup regex_lock and ftrace_lock around hash updating
        ftrace, kprobes: Fix a deadlock on ftrace_regex_lock
        ftrace: Have ftrace_regex_write() return either read or error
        tracing: Return error if register_ftrace_function_probe() fails for event_enable_func()
        tracing: Don't succeed if event_enable_func did not register anything
        ring-buffer: Select IRQ_WORK
      26b840ae
  9. 11 May, 2013 4 commits
    • Linus Torvalds's avatar
      Merge tag 'stable/for-linus-3.10-rc0-tag-two' of... · 607eeb0b
      Linus Torvalds authored
      Merge tag 'stable/for-linus-3.10-rc0-tag-two' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen
      
      Pull Xen bug-fixes from Konrad Rzeszutek Wilk:
       - More fixes in the vCPU PVHVM hotplug path.
       - Add more documentation.
       - Fix various ARM related issues in the Xen generic drivers.
       - Updates in the xen-pciback driver per Bjorn's updates.
       - Mask the x2APIC feature for PV guests.
      
      * tag 'stable/for-linus-3.10-rc0-tag-two' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen:
        xen/pci: Used cached MSI-X capability offset
        xen/pci: Use PCI_MSIX_TABLE_BIR, not PCI_MSIX_FLAGS_BIRMASK
        xen: clear IRQ_NOAUTOEN and IRQ_NOREQUEST
        xen: mask x2APIC feature in PV
        xen: SWIOTLB is only used on x86
        xen/spinlock: Fix check from greater than to be also be greater or equal to.
        xen/smp/pvhvm: Don't point per_cpu(xen_vpcu, 33 and larger) to shared_info
        xen/vcpu: Document the xen_vcpu_info and xen_vcpu
        xen/vcpu/pvhvm: Fix vcpu hotplugging hanging.
      607eeb0b
    • Linus Torvalds's avatar
      Merge tag 'scsi-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi · 4c444501
      Linus Torvalds authored
      Pull second SCSI update from James "Jaj B" Bottomley:
       "This is the final round of SCSI patches for the merge window.  It
        consists mostly of driver updates (bnx2fc, ibmfc, fnic, lpfc,
        be2iscsi, pm80xx, qla4x and ipr).
      
        There's also the power management updates that complete the patches in
        Jens' tree, an iscsi refcounting problem fix from the last pull, some
        dif handling in scsi_debug fixes, a few nice code cleanups and an
        error handling busy bug fix."
      
      * tag 'scsi-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi: (92 commits)
        [SCSI] qla2xxx: Update firmware link in Kconfig file.
        [SCSI] iscsi class, qla4xxx: fix sess/conn refcounting when find fns are used
        [SCSI] sas: unify the pointlessly separated enums sas_dev_type and sas_device_type
        [SCSI] pm80xx: thermal, sas controller config and error handling update
        [SCSI] pm80xx: NCQ error handling changes
        [SCSI] pm80xx: WWN Modification for PM8081/88/89 controllers
        [SCSI] pm80xx: Changed module name and debug messages update
        [SCSI] pm80xx: Firmware flash memory free fix, with addition of new memory region for it
        [SCSI] pm80xx: SPC new firmware changes for device id 0x8081 alone
        [SCSI] pm80xx: Added SPCv/ve specific hardware functionalities and relevant changes in common files
        [SCSI] pm80xx: MSI-X implementation for using 64 interrupts
        [SCSI] pm80xx: Updated common functions common for SPC and SPCv/ve
        [SCSI] pm80xx: Multiple inbound/outbound queue configuration
        [SCSI] pm80xx: Added SPCv/ve specific ids, variables and modify for SPC
        [SCSI] lpfc: fix up Kconfig dependencies
        [SCSI] Handle MLQUEUE busy response in scsi_send_eh_cmnd
        [SCSI] sd: change to auto suspend mode
        [SCSI] sd: use REQ_PM in sd's runtime suspend operation
        [SCSI] qla4xxx: Fix iocb_cnt calculation in qla4xxx_send_mbox_iocb()
        [SCSI] ufs: Correct the expected data transfersize
        ...
      4c444501
    • Linus Torvalds's avatar
      Merge branch 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux · ac4e0109
      Linus Torvalds authored
      Pull idle update from Len Brown:
       "Add support for new Haswell-ULT CPU idle power states"
      
      * 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux:
        intel_idle: initial C8, C9, C10 support
        tools/power turbostat: display C8, C9, C10 residency
      ac4e0109
    • Linus Torvalds's avatar
      Merge git://git.infradead.org/users/eparis/audit · c4cc75c3
      Linus Torvalds authored
      Pull audit changes from Eric Paris:
       "Al used to send pull requests every couple of years but he told me to
        just start pushing them to you directly.
      
        Our touching outside of core audit code is pretty straight forward.  A
        couple of interface changes which hit net/.  A simple argument bug
        calling audit functions in namei.c and the removal of some assembly
        branch prediction code on ppc"
      
      * git://git.infradead.org/users/eparis/audit: (31 commits)
        audit: fix message spacing printing auid
        Revert "audit: move kaudit thread start from auditd registration to kaudit init"
        audit: vfs: fix audit_inode call in O_CREAT case of do_last
        audit: Make testing for a valid loginuid explicit.
        audit: fix event coverage of AUDIT_ANOM_LINK
        audit: use spin_lock in audit_receive_msg to process tty logging
        audit: do not needlessly take a lock in tty_audit_exit
        audit: do not needlessly take a spinlock in copy_signal
        audit: add an option to control logging of passwords with pam_tty_audit
        audit: use spin_lock_irqsave/restore in audit tty code
        helper for some session id stuff
        audit: use a consistent audit helper to log lsm information
        audit: push loginuid and sessionid processing down
        audit: stop pushing loginid, uid, sessionid as arguments
        audit: remove the old depricated kernel interface
        audit: make validity checking generic
        audit: allow checking the type of audit message in the user filter
        audit: fix build break when AUDIT_DEBUG == 2
        audit: remove duplicate export of audit_enabled
        Audit: do not print error when LSMs disabled
        ...
      c4cc75c3
  10. 10 May, 2013 22 commits