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[Bug runtime/19000] several task tapset functions can cause kernel crash


https://sourceware.org/bugzilla/show_bug.cgi?id=19000

--- Comment #3 from Martin Cermak <mcermak at redhat dot com> ---
Using stap release-2.9-4-g4dc97b40ad9e, `stap -ge 'probe oneshot
{println(task_egid(0))}'` still seems to kill the rhel7/s390x kernel:

=======
[  727.130211] stap_09eb0146da34d3191a27df63ae2c7fb4_3098: module verification
f
ailed: signature and/or required key missing - tainting kernel
[  727.170592] Unable to handle kernel pointer dereference at virtual kernel
add
ress 00a8b00000001000
[  727.170635] Oops: 0038 [#1] SMP
[  727.170639] Modules linked in:
stap_09eb0146da34d3191a27df63ae2c7fb4_3098(OE)
 vmur nfsd auth_rpcgss nfs_acl lockd grace sunrpc ip_tables xfs libcrc32c
dasd_f
ba_mod qeth_l2 dasd_eckd_mod dasd_mod lcs ctcm qeth qdio ccwgroup fsm dm_mirror
dm_region_hash dm_log dm_mod
[  727.170667] CPU: 1 PID: 3098 Comm: stapio Tainted: G           OE 
----------
--   3.10.0-319.el7.s390x #1
[  727.170671] task: 0000000001fa5be0 ti: 000000007ab54000 task.ti:
000000007ab5
4000
[  727.170675] Krnl PSW : 0704e00180000000 00000000001c2816
(map_id_up+0x6/0x80)

[  727.170683]            R:0 T:1 IO:1 EX:1 Key:0 M:1 W:0 P:0 AS:3 CC:2 PM:0
EA:
3
Krnl GPRS: 0000000000000081 00000000001c2980 00a8b00000001044 0000000000000000
[  727.170692]            000003ff00000001 0000000000000000 000003e081e05270
000
000007ab57d90
[  727.170701]            0000000000000000 000003e081e05000 000003ff00000001
000
0000000000000
[  727.170702]            000000000000000c 000000000000092f 00000000001c29ac
000
000007ab57cc0
[  727.170710] Krnl Code: 00000000001c280c: 07fe                bcr     15,%r14
           00000000001c280e: 0707               bcr     0,%r7
          #00000000001c2810: ebbcf0700024       stmg    %r11,%r12,112(%r15)
          >00000000001c2816: 58b02000           l       %r11,0(%r2)
           00000000001c281a: 07e0               bcr     14,%r0
           00000000001c281c: ecb8001b007e       cij     %r11,0,8,1c2852
           00000000001c2822: b9040012           lgr     %r1,%r2
           00000000001c2826: a7080000           lhi     %r0,0
[  727.170722] Call Trace:
[  727.170723] ([<0000000000000001>] 0x1)
[  727.170725]  [<000003ff80839508>] probe_2757+0x178/0x320
[stap_09eb0146da34d3
191a27df63ae2c7fb4_3098]
[  727.170728]  [<000003ff8083aade>] enter_be_probe+0x10e/0x230
[stap_09eb0146da
34d3191a27df63ae2c7fb4_3098]
[  727.170730]  [<000003ff8083ba5e>] _stp_ctl_write_cmd+0x94e/0x9d0
[stap_09eb01
46da34d3191a27df63ae2c7fb4_3098]
[  727.170733]  [<000000000028b4ea>] vfs_write+0xa2/0x1c8
[  727.170737]  [<000000000028c084>] SyS_write+0x6c/0x100
[  727.170738]  [<00000000005d66fa>] sysc_tracego+0x14/0x1a
[  727.170742]  [<000003fffd389520>] 0x3fffd389520
[  727.170744] Last Breaking-Event-Address:
[  727.170744]  [<00000000001c29a6>] from_kgid_munged+0x26/0x48
[  727.170746]
[  727.170747] Kernel panic - not syncing: Fatal exception: panic_on_oops
00: HCPGSP2629I The virtual machine is placed in CP mode due to a SIGP stop
from
 CPU 00.
01: HCPGIR450W CP entered; disabled wait PSW 00020001 80000000 00000000
0010EC20
=======

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