I've seen something very similar to this on this platform and I believe
it's a combination of previous regressions tests and the stress-ng
sysinfo test that triggers this. Running the stress-ng stressor after a
clean boot won't trigger this issue.
** Changed in: linux (Ubuntu)
Importance: Undecided => Medium
** Changed in: linux (Ubuntu)
Assignee: (unassigned) => Colin Ian King (colin-king)
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https://bugs.launchpad.net/bugs/1856900
Title:
stress-ng sysinfo stressor fails on ppc64el with linux 5.4.0-9.12
Status in linux package in Ubuntu:
Incomplete
Bug description:
During autopkgtest testing the sysinfo stressor failed, causing the
kernel to oops.
16:20:34 DEBUG| [stdout] sysinfo STARTING
16:20:39 DEBUG| [stdout] sysinfo RETURNED 0
16:20:39 DEBUG| [stdout] sysinfo FAILED (kernel oopsed)
16:20:39 DEBUG| [stdout] [ 6521.203448] kernel tried to execute
exec-protected page (c0000000c25ffce0) - exploit attempt? (uid: 0)
16:20:39 DEBUG| [stdout] [ 6521.207260] BUG: Unable to handle kernel
instruction fetch
16:20:39 DEBUG| [stdout] [ 6521.207307] Faulting instruction address:
0xc0000000c25ffce0
16:20:39 DEBUG| [stdout] [ 6521.207367] Oops: Kernel access of bad area, sig:
11 [#1]
16:20:39 DEBUG| [stdout] [ 6521.207416] LE PAGE_SIZE=64K MMU=Hash SMP
NR_CPUS=2048 NUMA pSeries
16:20:39 DEBUG| [stdout] [ 6521.207481] Modules linked in: unix_diag sctp
vhost_vsock vmw_vsock_virtio_transport_common vsock zfs(PO) zunicode(PO)
zavl(PO) icp(PO) zlua(PO) userio zcommon(PO) znvpair(PO) cuse spl(O) kvm_pr kvm
snd_seq snd_seq_device snd_timer snd soundcore hci_vhci bluetooth ecdh_generic
ecc uhid hid vhost_net vhost tap atm algif_rng aegis128 algif_aead anubis
fcrypt khazad seed sm4_generic tea crc32_generic md4 michael_mic nhpoly1305
poly1305_generic rmd128 rmd160 rmd256 rmd320 sha3_generic sm3_generic
streebog_generic tgr192 wp512 xxhash_generic blowfish_generic blowfish_common
cast5_generic des_generic libdes salsa20_generic chacha_generic
camellia_generic cast6_generic cast_common serpent_generic twofish_generic
twofish_common algif_skcipher aufs sch_etf sch_fq dccp_ipv6 dccp_ipv4 dccp
ip6table_nat ip6_tables iptable_nat xt_nat nf_nat nf_conntrack nf_defrag_ipv6
nf_defrag_ipv4 algif_hash af_alg ip_vti ip6_vti fou6 sit ipip tunnel4 fou
geneve act_mirred cls_basic esp6 authenc echainiv
16:20:39 DEBUG| [stdout] [ 6521.208045] iptable_filter xt_policy veth
esp4_offload esp4 xfrm_user xfrm_algo macsec vxlan ip6_udp_tunnel udp_tunnel
vrf 8021q garp mrp bridge stp llc ip6_gre ip6_tunnel tunnel6 ip_gre ip_tunnel
gre cls_u32 sch_htb dummy tls binfmt_misc af_packet_diag tcp_diag udp_diag
raw_diag inet_diag iptable_mangle xt_TCPMSS xt_tcpudp bpfilter dm_multipath
scsi_dh_rdac scsi_dh_emc scsi_dh_alua vmx_crypto crct10dif_vpmsum sch_fq_codel
ip_tables x_tables autofs4 btrfs xor zstd_compress raid6_pq libcrc32c
crc32c_vpmsum virtio_blk virtio_net net_failover failover [last unloaded:
trace_printk]
16:20:39 DEBUG| [stdout] [ 6521.209360] CPU: 1 PID: 2647099 Comm: fuse_mnt
Tainted: P OE 5.4.0-9-generic #12-Ubuntu
16:20:39 DEBUG| [stdout] [ 6521.209457] NIP: c0000000c25ffce0 LR:
c00000000063f058 CTR: c0000000c25ffce0
16:20:39 DEBUG| [stdout] [ 6521.209528] REGS: c000000109703810 TRAP: 0400
Tainted: P OE (5.4.0-9-generic)
16:20:39 DEBUG| [stdout] [ 6521.209608] MSR: 8000000010009033
<SF,EE,ME,IR,DR,RI,LE> CR: 88002440 XER: 20000000
16:20:39 DEBUG| [stdout] [ 6521.209681] CFAR: c00000000063f054 IRQMASK: 0
16:20:39 DEBUG| [stdout] GPR00: c00000000063f034
c000000109703aa0 c000000001a4bb00 c00000007cef3000
16:20:39 DEBUG| [stdout] GPR04: c0000000c25ffc18
0000000000000000 0000000000000000 0000000000000000
16:20:39 DEBUG| [stdout] GPR08: 0000000000000000
0000000000000000 0000000000000000 0000000000000000
16:20:39 DEBUG| [stdout] GPR12: c0000000c25ffce0
c00000003fffee00 000079b6987b4410 0000000000000000
16:20:39 DEBUG| [stdout] GPR16: 000079b698b30000
000079b6987b0320 000079b69771f240 000079b6987b4420
16:20:39 DEBUG| [stdout] GPR20: 0000000000000000
0000000000000000 000079b6880010a0 000079b698a4d3a0
16:20:39 DEBUG| [stdout] GPR24: c000000109d56cc0
c0000001fde0cd8c c0000000c25ffce0 c000000109d56ca0
16:20:39 DEBUG| [stdout] GPR28: c000000109d56cc0
0000000000000000 c00000007cef3000 c000000109d56c90
16:20:39 DEBUG| [stdout] [ 6521.210276] NIP [c0000000c25ffce0]
0xc0000000c25ffce0
16:20:39 DEBUG| [stdout] [ 6521.210355] LR [c00000000063f058]
fuse_request_end+0x128/0x2f0
16:20:39 DEBUG| [stdout] [ 6521.210423] Call Trace:
16:20:39 DEBUG| [stdout] [ 6521.210448] [c000000109703aa0] [c00000000063f034]
fuse_request_end+0x104/0x2f0 (unreliable)
16:20:39 DEBUG| [stdout] [ 6521.210520] [c000000109703af0] [c000000000642ebc]
fuse_dev_do_write+0x2cc/0x5c0
16:20:39 DEBUG| [stdout] [ 6521.210591] [c000000109703b70] [c000000000643654]
fuse_dev_write+0x74/0xd0
16:20:39 DEBUG| [stdout] [ 6521.210660] [c000000109703c00] [c0000000004707c0]
do_iter_readv_writev+0x240/0x290
16:20:39 DEBUG| [stdout] [ 6521.210735] [c000000109703c70] [c0000000004730d8]
do_iter_write+0xc8/0x280
16:20:39 DEBUG| [stdout] [ 6521.210794] [c000000109703cc0] [c0000000004733a0]
vfs_writev+0xe0/0x180
16:20:39 DEBUG| [stdout] [ 6521.210854] [c000000109703dc0] [c0000000004734dc]
do_writev+0x9c/0x1a0
16:20:39 DEBUG| [stdout] [ 6521.210915] [c000000109703e20] [c00000000000b278]
system_call+0x5c/0x68
16:20:39 DEBUG| [stdout] [ 6521.210973] Instruction dump:
16:20:39 DEBUG| [stdout] [ 6521.211018] XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX
XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX
16:20:39 DEBUG| [stdout] [ 6521.211089] XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX
XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX
16:20:39 DEBUG| [stdout] [ 6521.211168] ---[ end trace 141e6d1cc5d48ea2 ]---
Full testing log:
https://objectstorage.prodstack4-5.canonical.com/v1/AUTH_77e2ada1e7a84929a74ba3b87153c0ac
/autopkgtest-focal/focal/ppc64el/l/linux/20191218_163756_0e1f6@/log.gz
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