[Bug uprobes/13539] occasional oops, kernel SEGV, RHEL5, :uprobes:uprobe_free_process+0xba/0x131

["fche at redhat dot com" <sourceware-bugzilla at sourceware dot org>]

http://sourceware.org/bugzilla/show_bug.cgi?id=13539

--- Comment #1 from Frank Ch. Eigler <fche at redhat dot com> 2011-12-21 22:38:13 UTC ---
Another version of the crash:

stap_909f4a49ec3ab955a92f98c10baf87c9_2099: systemtap: 1.7/0.152, base:
ffffffff88712000, memory: 93data/25text/4ctx/2058net/3
3alloc kb, probes: 2, unpriv-uid: 0
stap_ba22ca5697adb576d5fc2abd30243ca3_2219: systemtap: 1.7/0.152, base:
ffffffff88712000, memory: 93data/25text/4ctx/2058net/3
3alloc kb, probes: 2, unpriv-uid: 0
stap_daaddeacf81c54361489519b49af6c39_2257: systemtap: 1.7/0.152, base:
ffffffff88712000, memory: 93data/25text/4ctx/2058net/3
3alloc kb, probes: 2, unpriv-uid: 0
Unable to handle kernel paging request at 0000000000200200 RIP: 
 [<ffffffff887025cf>] :uprobes:uprobe_free_task+0x21/0xbb
PGD 256c6067 PUD 1dfc3067 PMD 0 
Oops: 0002 [1] SMP 
last sysfs file: /module/xt_tcpudp/sections/__versions
CPU 0 
Modules linked in: stap_daaddeacf81c54361489519b49af6c39_2257(U) uprobes(U)
virtio_pci virtio_ring virtio_balloon virtio xt_tc
pudp iptable_nat ip_nat ip_conntrack nfnetlink ip_tables x_tables netconsole
hidp nfs nfs_acl rfcomm l2cap bluetooth lockd sun
rpc be2iscsi ib_iser rdma_cm ib_cm iw_cm ib_sa ib_mad ib_core ib_addr iscsi_tcp
bnx2i cnic ipv6 xfrm_nalgo crypto_api uio cxgb
3i libcxgbi cxgb3 8021q libiscsi_tcp libiscsi2 scsi_transport_iscsi2
scsi_transport_iscsi loop dm_multipath scsi_dh video back
light sbs power_meter hwmon i2c_ec dell_wmi wmi button battery asus_acpi
acpi_memhotplug ac lp floppy 8139too 8139cp mii i2c_p
iix4 i2c_core parport_pc parport ide_cd serio_raw cdrom tpm_tis tpm tpm_bios
pcspkr dm_raid45 dm_message dm_region_hash dm_mem
_cache dm_snapshot dm_zero dm_mirror dm_log dm_mod ata_piix libata sd_mod
scsi_mod ext3 jbd uhci_hcd ohci_hcd ehci_hcd
Pid: 4554, comm: loop Tainted: G     ---- 2.6.18-300.el5 #1
RIP: 0010:[<ffffffff887025cf>]  [<ffffffff887025cf>]
:uprobes:uprobe_free_task+0x21/0xbb
RSP: 0018:ffff810024ec1e88  EFLAGS: 00010006
RAX: 0000000000100100 RBX: ffff810018a5da00 RCX: 0000000000000000
RDX: 0000000000200200 RSI: 0000000000000296 RDI: ffffffff88708880
RBP: ffff810031ad6580 R08: ffff810024ec0000 R09: 00000000aab470c6
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: ffff810018a5db78 R14: ffff810020bbb580 R15: ffff810024ec1f30
FS:  0000000041c3d940(0063) GS:ffffffff8042f000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
CR2: 0000000000200200 CR3: 000000002438a000 CR4: 00000000000006e0
Process loop (pid: 4554, threadinfo ffff810024ec0000, task ffff81003e38b7a0)
Stack:  ffff810018a5da00 ffff810031ad6580 0000000000000000 ffffffff88704940
 0000000000000000 ffff810019e6dd40 0000000000000000 ffff81003e38b7a0
 0000000000000003 ffffffff800c5088 ffff8100317ab800 ffff810020bbb590
Call Trace:
 [<ffffffff88704940>] :uprobes:uprobe_report_exit+0xe0/0x14f
 [<ffffffff800c5088>] utrace_report_exit+0x57/0x17d
 [<ffffffff800156a8>] do_exit+0xdb/0x955
 [<ffffffff8009557b>] complete_and_exit+0x0/0x16
 [<ffffffff8005d28d>] tracesys+0xd5/0xe0


Code: 48 89 02 74 04 48 89 50 08 48 c7 c7 80 88 70 88 48 c7 45 00 
RIP  [<ffffffff887025cf>] :uprobes:uprobe_free_task+0x21/0xbb
 RSP <ffff810024ec1e88>

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