1. 19 Jun, 2008 1 commit
    • Dario Faggioli's avatar
      sched: NULL pointer dereference while setting sched_rt_period_us · 49307fd6
      Dario Faggioli authored
      When CONFIG_RT_GROUP_SCHED and CONFIG_CGROUP_SCHED are enabled, with:
      
       echo 10000 > /proc/sys/kernel/sched_rt_period_us
      
      We get this:
      
       BUG: unable to handle kernel NULL pointer dereference at 0000008c
       [  947.682233] IP: [<c0216b72>] __rt_schedulable+0x12/0x160
       [  947.683123] *pde = 00000000=20
       [  947.683782] Oops: 0000 [#1]
       [  947.684307] Modules linked in:
       [  947.684308]
       [  947.684308] Pid: 2359, comm: bash Not tainted (2.6.26-rc6 #8)
       [  947.684308] EIP: 0060:[<c0216b72>] EFLAGS: 00000246 CPU: 0
       [  947.684308] EIP is at __rt_schedulable+0x12/0x160
       [  947.684308] EAX: 00000000 EBX: 00000000 ECX: 00000000 EDX: 00000001
       [  947.684308] ESI: c0521db4 EDI: 00000001 EBP: c6cc9f00 ESP: c6cc9ed0
       [  947.684308]  DS: 007b ES: 007b FS: 0000 GS: 0033 SS: 0068
       [  947.684308] Process bash (pid: 2359, tiÆcc8000 taskÇa54f00=20 task.tiÆcc8000)
       [  947.684308] Stack: c0222790 00000000 080f8c08 c0521db4 c6cc9f00 00000001 00000000 00000000
       [  947.684308]        c6cc9f9c 00000000 c0521db4 00000001 c6cc9f28 c0216d40 00000000 00000000
       [  947.684308]        c6cc9f9c 000f4240 000e7ef0 ffffffff c0521db4 c79dfb60 c6cc9f58 c02af2cc
       [  947.684308] Call Trace:
       [  947.684308]  [<c0222790>] ? do_proc_dointvec_conv+0x0/0x50
       [  947.684308]  [<c0216d40>] ? sched_rt_handler+0x80/0x110
       [  947.684308]  [<c02af2cc>] ? proc_sys_call_handler+0x9c/0xb0
       [  947.684308]  [<c02af2fa>] ? proc_sys_write+0x1a/0x20
       [  947.684308]  [<c0273c36>] ? vfs_write+0x96/0x160
       [  947.684308]  [<c02af2e0>] ? proc_sys_write+0x0/0x20
       [  947.684308]  [<c027423d>] ? sys_write+0x3d/0x70
       [  947.684308]  [<c0202ef5>] ? sysenter_past_esp+0x6a/0x91
       [  947.684308]  =======================
       [  947.684308] Code: 24 04 e8 62 b1 0e 00 89 c7 89 f8 8b 5d f4 8b 75
       f8 8b 7d fc 89 ec 5d c3 90 55 89 e5 57 56 53 83 ec 24 89 45 ec 89 55 e4
       89 4d e8 <8b> b8 8c 00 00 00 85 ff 0f 84 c9 00 00 00 8b 57 24 39 55 e8
       8b
       [  947.684308] EIP: [<c0216b72>] __rt_schedulable+0x12/0x160 SS:ESP  0068:c6cc9ed0
      
      We think the following patch solves the issue.
      Signed-off-by: default avatarDario Faggioli <raistlin@linux.it>
      Signed-off-by: default avatarMichael Trimarchi <trimarchimichael@yahoo.it>
      Signed-off-by: default avatarPeter Zijlstra <a.p.zijlstra@chello.nl>
      Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
      49307fd6
  2. 17 Jun, 2008 1 commit
  3. 15 Jun, 2008 14 commits
  4. 14 Jun, 2008 1 commit
  5. 13 Jun, 2008 23 commits