Public bug reported:
Testing for SRU cycle s2025.07.14 discovered a kernel panic during
ubuntu_kselftests_net.net:test_vxlan_fdb_changelink.sh
noble:linux-gcp-6.14 6.14.0-1015.16~24.04.1
The issue was observed to be sporadic. Re-running the test resulted in a
PASS.
[ 1955.183204] Unable to handle kernel NULL pointer dereference at virtual
address 0000000000000010
[ 1955.184298] Mem abort info:
[ 1955.184629] ESR = 0x0000000096000004
[ 1955.185073] EC = 0x25: DABT (current EL), IL = 32 bits
[ 1955.185733] SET = 0, FnV = 0
...
[ 1955.208910] Workqueue: mld mld_ifc_work
[ 1955.209373] pstate: 63400005 (nZCv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--)
[ 1955.210207] pc : vxlan_xmit_one+0xa74/0x14b0 [vxlan]
[ 1955.210825] lr : vxlan_xmit_one+0x9e8/0x14b0 [vxlan]
[ 1955.211437] sp : ffff800082fd3690
[ 1955.211847] x29: ffff800082fd37a0 x28: 0000000000006e47 x27: 0000000000000000
[ 1955.212719] x26: 0000000000000050 x25: ffff0000c6b22800 x24: ffff0000c524b840
[ 1955.213592] x23: ffff0000cd0e2a80 x22: 0000000000009ed9 x21: 00000000d0070000
[ 1955.214466] x20: ffff0000cd0e2000 x19: ffff0000c799f400 x18: ffff800082fcd078
[ 1955.215340] x17: 0000000000000000 x16: 0000000000000000 x15: 0000000000000002
[ 1955.216207] x14: 0000000000000000 x13: 000000000000005a x12: 0000000000000000
[ 1955.217074] x11: 0000000000080001 x10: 0000000000000000 x9 : 0000000000000000
[ 1955.217964] x8 : 0000000000000000 x7 : ffff0000c524b890 x6 : ffffdb9399048400
[ 1955.218855] x5 : 0000000000000000 x4 : ffffdb9399048400 x3 : 0000000000008000
[ 1955.219744] x2 : 0000000000000000 x1 : 0000000000000000 x0 : 0000000000000000
[ 1955.220636] Call trace:
[ 1955.220948] vxlan_xmit_one+0xa74/0x14b0 [vxlan] (P)
[ 1955.221572] vxlan_xmit+0x498/0x5d0 [vxlan]
[ 1955.222105] dev_hard_start_xmit+0xac/0x1d8
[ 1955.222632] __dev_queue_xmit+0x1ac/0x820
[ 1955.223139] neigh_hh_output+0x98/0x110
[ 1955.223622] ip6_finish_output2+0x414/0x618
[ 1955.224128] ip6_finish_output+0x1f4/0x3f8
[ 1955.224623] ip6_output+0x84/0x1a8
[ 1955.225039] NF_HOOK.constprop.0+0x58/0x100
[ 1955.225548] mld_sendpack+0x188/0x318
[ 1955.226001] mld_send_cr+0x1cc/0x350
[ 1955.226440] mld_ifc_work+0x40/0x208
[ 1955.226881] process_one_work+0x174/0x408
[ 1955.227372] worker_thread+0x29c/0x4e0
[ 1955.227834] kthread+0xe8/0x100
[ 1955.228222] ret_from_fork+0x10/0x20
[ 1955.228663] Code: 7103801f 1a9f17e0 b9003be0 17fffe5e (f9400800)
[ 1955.229407] ---[ end trace 0000000000000000 ]---
[ 1955.251684] Kernel panic - not syncing: Oops: Fatal exception in interrupt
[ 1955.252442] SMP: stopping secondary CPUs
[ 1955.252909] Kernel Offset: 0x5b93152e0000 from 0xffff800080000000
[ 1955.253615] PHYS_OFFSET: 0x40000000
[ 1955.254017] CPU features: 0x200,000000f0,0084e250,aa27fea7
[ 1955.254630] Memory Limit: none
[ 1955.273409] Rebooting in 10 seconds..
UEFI firmware (version built at 09:00:00 on Jan 10 2025)
EMU Variable FVB Started
EMU Variable invalid PCD sizes
Found PL031 RTC @ 0x9010000
InitializeRealTimeClock: using default timezone/daylight settings
** Affects: linux-gcp (Ubuntu)
Importance: Undecided
Status: Invalid
** Affects: linux-gcp (Ubuntu Noble)
Importance: Undecided
Status: New
** Also affects: linux-hwe-6.14 (Ubuntu Noble)
Importance: Undecided
Status: New
** Changed in: linux-hwe-6.14 (Ubuntu)
Status: New => Invalid
** Package changed: linux-hwe-6.14 (Ubuntu) => linux-gcp (Ubuntu)
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https://bugs.launchpad.net/bugs/2121240
Title:
kernel panic during ubuntu_kselftests_net:test_vxlan_fdb_changelink.sh
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