Hi Naresh,
On 02/01/2024 10:48, Naresh Kamboju wrote:
Following kernel oops noticed on qemu-arm64 while running selftests: net/mptcp: mptcp_connect.sh test cases on Linux next-20240102
Thank you for having cc MPTCP list for this failure with an MPTCP selftest.
Reported-by: Linux Kernel Functional Testing lkft@linaro.org
Test log:
# selftests: net/mptcp: mptcp_connect.sh # INFO: set ns3-6593b550-fBKovo dev ns3eth2: ethtool -K gso off # INFO: set ns4-6593b550-fBKovo dev ns4eth3: ethtool -K gro off # Created /tmp/tmp.vFrp4xubYR (size 219663 /tmp/tmp.vFrp4xubYR) containing data sent by client # Created /tmp/tmp.FrEUtOwsBN (size 5630063 /tmp/tmp.FrEUtOwsBN) containing data sent by server # New MPTCP socket can be blocked via sysctl [ OK ] # INFO: validating network environment with pings <6>[ 32.891365] netem: version 1.3 <1>[ 32.901072] Unable to handle kernel NULL pointer dereference at virtual address 0000000000000000 <1>[ 32.901926] Mem abort info: <1>[ 32.903342] ESR = 0x0000000086000004 <1>[ 32.903768] EC = 0x21: IABT (current EL), IL = 32 bits <1>[ 32.904589] SET = 0, FnV = 0 <1>[ 32.905415] EA = 0, S1PTW = 0 <1>[ 32.905914] FSC = 0x04: level 0 translation fault <1>[ 32.909254] user pgtable: 4k pages, 48-bit VAs, pgdp=0000000103097000 <1>[ 32.909914] [0000000000000000] pgd=0000000000000000, p4d=0000000000000000 <0>[ 32.913724] Internal error: Oops: 0000000086000004 [#1] PREEMPT SMP <4>[ 32.914739] Modules linked in: sch_netem crct10dif_ce sm3_ce sm3 sha3_ce sha512_ce sha512_arm64 fuse drm backlight dm_mod ip_tables x_tables <4>[ 32.916764] CPU: 0 PID: 438 Comm: tc Not tainted 6.7.0-rc8-next-20240102 #1 <4>[ 32.917555] Hardware name: linux,dummy-virt (DT) <4>[ 32.918608] pstate: 63400809 (nZCv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=-c) <4>[ 32.919392] pc : 0x0 <4>[ 32.920396] lr : qdisc_block_add_dev (net/sched/sch_api.c:1191)
It doesn't look like to be an issue with MPTCP, but with TC (QDisc).
It seems like the issue has already been reported. There is even a patch that has been proposed by Victor (but it looks like a new version is expected):
https://lore.kernel.org/netdev/20231231172320.245375-1-victor@mojatatu.com/
Cheers, Matt