[Bug kprobes/2387] New: system crash on ppc64/2.6.15.4

["guanglei at cn dot ibm dot com" <sourceware-bugzilla at sourceware dot org>]

when running dbench, I use systemtap to probe all syscalls on ppc64/2.6.15.4,
the system will crash shortly. the error given by xmon:

Unable to handle kernel paging request for data at address 0x00000010
Faulting instruction address: 0xd000000000270ee4
cpu 0x1: Vector: 300 (Data Access) at [c00000005d95a8c0]
    pc: d000000000270ee4: ._stp_print_flush+0xb8/0x164 [stap_13972]
    lr: d000000000272a94: .probe_1+0x374/0x400 [stap_13972]
    sp: c00000005d95ab40
   msr: 8000000000001032
   dar: 10
 dsisr: 40000000
  current = 0xc000000020739040
  paca    = 0xc000000000538400
    pid   = 25259, comm = hotplug
enter ? for help

1:mon> t
[c00000005d95abf0] d000000000272a94 .probe_1+0x374/0x400 [stap_13972]
[c00000005d95ac90] d000000000272cf4 .dwarf_kprobe_1_enter+0x13c/0x1d8 [stap_13972]
[c00000005d95ad10] c00000000041959c .kprobe_exceptions_notify+0x334/0x5e8
[c00000005d95add0] c00000000041a134 .notifier_call_chain+0x68/0x98
[c00000005d95ae60] c000000000418834 .program_check_exception+0x114/0x5d0
[c00000005d95af00] c000000000004348 program_check_common+0xc8/0x100
--- Exception: 700 (Program Check) at c0000000000b0b94
.__find_get_block_slow+0x0/0x174
[link register   ] c0000000000b1940 .__find_get_block+0x110/0x278
[c00000005d95b1f0] c00000000027c6b0 .put_device+0x1c/0x30 (unreliable)
[c00000005d95b2d0] c0000000000b5184 .__getblk+0x44/0x2cc
[c00000005d95b390] c00000000013d678 .__ext3_get_inode_loc+0x1b0/0x42c
[c00000005d95b450] c00000000013e568 .ext3_reserve_inode_write+0x58/0x11c
[c00000005d95b500] c00000000013e650 .ext3_mark_inode_dirty+0x24/0x5c
[c00000005d95b5b0] c000000000140df0 .ext3_dirty_inode+0x8c/0xbc
[c00000005d95b640] c0000000000ddcb4 .__mark_inode_dirty+0x70/0x1e8
[c00000005d95b6e0] c0000000000d105c .update_atime+0xa4/0xbc
[c00000005d95b770] c0000000000802e8 .do_generic_mapping_read+0x41c/0x474
[c00000005d95b8c0] c000000000082b4c .__generic_file_aio_read+0x1b4/0x21c
[c00000005d95b990] c000000000082d5c .generic_file_aio_read+0x44/0x54
[c00000005d95ba20] c0000000000ae520 .do_sync_read+0xcc/0x124
[c00000005d95bba0] c0000000000ae65c .vfs_read+0xe4/0x1b8
[c00000005d95bc40] c0000000000bd7a4 .kernel_read+0x34/0x58
[c00000005d95bce0] c0000000000e87b4 .compat_do_execve+0x15c/0x2c8
[c00000005d95bd90] c000000000012744 .compat_sys_execve+0x7c/0xf8
[c00000005d95be30] c000000000008600 syscall_exit+0x0/0x18
--- Exception: c01 (System Call) at 000000000fef6004
SP (ffc403c0) is in userspace

-- 
           Summary: system crash on ppc64/2.6.15.4
           Product: systemtap
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: kprobes
        AssignedTo: systemtap at sources dot redhat dot com
        ReportedBy: guanglei at cn dot ibm dot com


http://sourceware.org/bugzilla/show_bug.cgi?id=2387

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