Public bug reported:
Since upgrading to 4.8.0-14, the "storage" autopkgtest of systemd is
broken. This uses scsi_debug to get a test hard drive, which is reset
between the test through unloading/reloading the module. This has worked
fine so far (and still works on amd64/i386), but now regularly triggers
a kernel oops:
[ 161.120362] Unable to handle kernel paging request for data at address
0x00000000
[ 161.120468] Faulting instruction address: 0xc000000000538ecc
[ 161.120517] Oops: Kernel access of bad area, sig: 11 [#1]
[ 161.120555] SMP NR_CPUS=2048 NUMA pSeries
[ 161.120595] Modules linked in: dm_crypt dm_mod xts algif_skcipher af_alg
sd_mod sg xt_TCPMSS xt_tcpudp iptable_mangle ghash_generic gf128mul vmx_crypto
virtio_balloon ip_tables x_tables autofs4 ext4 crc16 jbd2 fscrypto mbcache
crc32c_generic btrfs xor raid6_pq ohci_pci ehci_pci ohci_hcd virtio_blk
virtio_net ehci_hcd usbcore crc32c_vpmsum usb_common virtio_pci virtio_ring
virtio [last unloaded: scsi_debug]
[ 161.121016] CPU: 0 PID: 5473 Comm: rmmod Not tainted 4.8.0-15-generic
#16-Ubuntu
[ 161.121067] task: c00000005ae51980 task.stack: c00000005ef58000
[ 161.121110] NIP: c000000000538ecc LR: c000000000538ee0 CTR: c0000000000f7250
[ 161.121162] REGS: c00000005ef5b9f0 TRAP: 0300 Not tainted
(4.8.0-15-generic)
[ 161.121213] MSR: 800000010280b033 <SF,VEC,VSX,EE,FP,ME,IR,DR,RI,LE,TM[E]>
CR: 28002444 XER: 20000000
[ 161.121390] CFAR: c00000000009a8e0 DAR: 0000000000000000 DSISR: 40000000
SOFTE: 1
GPR00: c000000000538e98 c00000005ef5bc70 c000000000f67b00
ffffffffffffffff
GPR04: d000000001302018 0000000000000002 0000000000000000
c0000000010d7b00
GPR08: c000000000fa7b00 0000000000000063 0000000000000073
0000000000000004
GPR12: 0000000028002844 c00000000fb80000 0000000000000000
0000000000000000
GPR16: 0000000000000000 00000100331f11f0 00000000384b3890
00000000384b3848
GPR20: 00000000384b3830 00000000384b3870 00000000384b38a8
00000000384b3888
GPR24: 00003fffd23d6e70 c000000000ebdec8 fffffffffffffffe
d000000001302018
GPR28: c000000000ebdeb8 0000000000000000 0000000000000000
0000000000000000
[ 161.122099] NIP [c000000000538ecc] ddebug_remove_module+0x8c/0x160
[ 161.122143] LR [c000000000538ee0] ddebug_remove_module+0xa0/0x160
[ 161.122186] Call Trace:
[ 161.122205] [c00000005ef5bc70] [c000000000538e98]
ddebug_remove_module+0x58/0x160 (unreliable)
[ 161.122280] [c00000005ef5bd10] [c00000000018961c] free_module+0x21c/0x3c0
[ 161.122333] [c00000005ef5bd60] [c000000000189a38]
SyS_delete_module+0x278/0x2f0
[ 161.122394] [c00000005ef5be30] [c0000000000095e0] system_call+0x38/0x108
[ 161.122445] Instruction dump:
[ 161.122472] 3d42fff5 e92a63b8 7fa9e000 7d3d4b78 ebe90000 419e00bc 7d3e4b78
3b40fffe
[ 161.122561] 48000018 7fbfe000 7ffdfb78 7ffefb78 <ebff0000> 419e0060 e87e0010
7f64db78
[ 161.122651] ---[ end trace 5f19b96c7077a0e0 ]---
This isn't reproducible by merely loading and unloading the module, it
apparently needs to get some actual exercise. I'll find a simpler
reproducer than running the systemd test tomorrow morning.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: Confirmed
** Tags: bot-stop-nagging kernel-4.8
** Tags added: bot-stop-nagging
** Summary changed:
- [4.8 regression] rmmod scsi_debug keeps causing kernel oops
+ [4.8.0-14/ppc64el regression] rmmod scsi_debug keeps causing kernel oops
** Changed in: linux (Ubuntu)
Status: New => Confirmed
** Tags added: kernel-4.8
--
You received this bug notification because you are a member of Ubuntu
Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/1626737
Title:
[4.8.0-14/ppc64el regression] rmmod scsi_debug keeps causing kernel
oops
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1626737/+subscriptions
--
ubuntu-bugs mailing list
[email protected]
https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
