Following kernel crash reported while running selftests: net: pmtu.sh on x15 device with kselftests merge configs enabled.

Reported-by: Linux Kernel Functional Testing lkft@linaro.org

# selftests: net: pmtu.sh ... # TEST: IPv4 over vxlan6: PMTU exceptions [ OK ] [ 169.299682] 8<--- cut here --- [ 169.302764] Unable to handle kernel paging request at virtual address 2c86c000 [ 169.310089] [2c86c000] *pgd=00000000 [ 169.313720] Internal error: Oops: 5 [#1] SMP ARM [ 169.318359] Modules linked in: act_csum act_pedit cls_flower sch_prio ip_tables x_tables veth tun cfg80211 bluetooth snd_soc_simple_card snd_soc_simple_card_utils etnaviv gpu_sched onboard_usb_hub snd_soc_davinci_mcasp snd_soc_ti_udma snd_soc_ti_edma snd_soc_ti_sdma snd_soc_core ac97_bus snd_pcm_dmaengine snd_pcm snd_timer snd soundcore display_connector fuse [last unloaded: test_blackhole_dev] [ 169.353576] CPU: 0 PID: 295 Comm: rngd Not tainted 6.0.3-rc1 #1 [ 169.359527] Hardware name: Generic DRA74X (Flattened Device Tree) [ 169.365631] PC is at percpu_counter_add_batch+0x28/0xc4 [ 169.370910] LR is at 0x0 [ 169.373443] pc : [<c0989aa8>] lr : [<00000000>] psr: 600d0113 [ 169.379730] sp : f0001ed8 ip : 00000020 fp : f0001f50 [ 169.385009] r10: c23aef04 r9 : c231efd0 r8 : c25da080 [ 169.390258] r7 : c84adb80 r6 : 00000001 r5 : c9a99440 r4 : 2c86c000 [ 169.396820] r3 : ffffffff r2 : ffffffff r1 : 00000000 r0 : c9a99440 [ 169.403381] Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none [ 169.410552] Control: 10c5387d Table: 891f006a DAC: 00000051 [ 169.416320] Register r0 information: slab net_namespace start c9a98ec0 data offset 64 pointer offset 1344 allocated at copy_net_ns+0x78/0x27c [ 169.429107] kmem_cache_alloc+0x328/0x43c [ 169.433380] copy_net_ns+0x78/0x27c [ 169.437164] create_new_namespaces+0x10c/0x2a4 [ 169.441894] unshare_nsproxy_namespaces+0x70/0x8c [ 169.446868] ksys_unshare+0x16c/0x32c [ 169.450836] ret_fast_syscall+0x0/0x1c [ 169.454864] Free path: [ 169.457305] cleanup_net+0x2e0/0x3c4 [ 169.461151] process_one_work+0x26c/0x708 [ 169.465454] worker_thread+0x60/0x4e8 [ 169.469421] kthread+0xfc/0x11c [ 169.472839] ret_from_fork+0x14/0x2c [ 169.476684] Register r1 information: NULL pointer [ 169.481414] Register r2 information: non-paged memory [ 169.486480] Register r3 information: non-paged memory [ 169.491577] Register r4 information: non-paged memory [ 169.496643] Register r5 information: slab net_namespace start c9a98ec0 data offset 64 pointer offset 1344 allocated at copy_net_ns+0x78/0x27c [ 169.509460] kmem_cache_alloc+0x328/0x43c [ 169.513763] copy_net_ns+0x78/0x27c [ 169.517517] create_new_namespaces+0x10c/0x2a4 [ 169.522247] unshare_nsproxy_namespaces+0x70/0x8c [ 169.527221] ksys_unshare+0x16c/0x32c [ 169.531188] ret_fast_syscall+0x0/0x1c [ 169.535217] Free path: [ 169.537658] cleanup_net+0x2e0/0x3c4 [ 169.541503] process_one_work+0x26c/0x708 [ 169.545806] worker_thread+0x60/0x4e8 [ 169.549743] kthread+0xfc/0x11c [ 169.553161] ret_from_fork+0x14/0x2c [ 169.557037] Register r6 information: non-paged memory [ 169.562103] Register r7 information: slab task_struct start c84adb40 data offset 64 pointer offset 0 allocated at copy_process+0x1a4/0x1950 [ 169.574707] kmem_cache_alloc+0x328/0x43c [ 169.579010] copy_process+0x1a4/0x1950 [ 169.583038] kernel_clone+0x5c/0x418 [ 169.586883] sys_clone+0x74/0x90 [ 169.590393] __sys_trace_return+0x0/0x10 [ 169.594604] Free path: [ 169.597076] rcu_core+0x3c8/0x1140 [ 169.600738] __do_softirq+0x130/0x538 [ 169.604675] Register r8 information: non-slab/vmalloc memory [ 169.610382] Register r9 information: non-slab/vmalloc memory [ 169.616058] Register r10 information: non-slab/vmalloc memory [ 169.621856] Register r11 information: 2-page vmalloc region starting at 0xf0000000 allocated at start_kernel+0x578/0x764 [ 169.632781] Register r12 information: non-paged memory [ 169.637939] Process rngd (pid: 295, stack limit = 0xf0188000) [ 169.643707] Stack: (0xf0001ed8 to 0xf0002000) [ 169.648101] 1ec0: c9b33540 00000000 [ 169.656311] 1ee0: 00000001 00000000 c25da080 c231efd0 c23aef04 c1325f00 00000020 c25da080 [ 169.664550] 1f00: c231efd0 c84adb80 c9b33570 c0402628 00000000 00000000 c04025c4 00000000 [ 169.672760] 1f20: 00000000 0000000a 00000000 c23b0940 c25d9e80 eeb0ff14 c229a5d8 c229a5d8 [ 169.680969] 1f40: c229a484 c229a484 eeb0fec0 00000001 00000000 f0001f50 00000000 e2868d57 [ 169.689178] 1f60: 00000002 c23030a4 00000008 00000009 c25d97e0 c231efd0 00000100 c84adb80 [ 169.697418] 1f80: 00000080 c0301e10 c3212340 c1770a48 00000015 c2303080 c229a518 0000000a [ 169.705627] 1fa0: c22a3100 c25d79bc c22a3100 ffffccf2 c2305d40 c1de927c c1dfc684 f0001fd0 [ 169.713836] 1fc0: 00400040 00000001 c231fbb0 c84adb80 000d0030 ffffffff c84adb80 c229a044 [ 169.722076] 1fe0: 00000000 b633f000 f0189fa8 c0359ca4 b6ec2cce c0359e00 b6ec2cce c099b6bc [ 169.730285] percpu_counter_add_batch from dst_destroy+0x11c/0x130 [ 169.736511] dst_destroy from rcu_core+0x3c8/0x1140 [ 169.741394] rcu_core from __do_softirq+0x130/0x538 [ 169.746307] __do_softirq from __irq_exit_rcu+0x14c/0x170 [ 169.751739] __irq_exit_rcu from irq_exit+0x10/0x30 [ 169.756622] irq_exit from call_with_stack+0x18/0x20 [ 169.761627] call_with_stack from __irq_usr+0x7c/0xa0 [ 169.766693] Exception stack(0xf0189fb0 to 0xf0189ff8) [ 169.771789] 9fa0: 6fce9940 1b458cad 0000003d b6b3e970 [ 169.779998] 9fc0: b6b3ea20 00028789 0001629c b6b3e8d8 000172a0 00000000 b633f000 b6b3f3a0 [ 169.788208] 9fe0: 00000000 b6b3e8d8 b6ec3835 b6ec2cce 000d0030 ffffffff [ 169.794860] Code: e5871004 ee1d4f90 e5901038 e1a0efcc (e7946001)

Broadcast message from systemd-journald@am57xx-evm (Thu 2022[ 169.801116] ---[ end trace 0000000000000000 ]--- -04-28 17:45:03 UTC): kernel[290]: [ 169.313720] Internal [ 169.811279] Kernel panic - not syncing: Fatal exception in interrupt [ 169.823211] CPU1: stopping [ 169.825927] CPU: 1 PID: 308 Comm: rngd Tainted: G D 6.0.3-rc1 #1 [ 169.833343] Hardware name: Generic DRA74X (Flattened Device Tree) [ 169.839477] unwind_backtrace from show_stack+0x18/0x1c [ 169.844757] show_stack from dump_stack_lvl+0x58/0x70 [ 169.849822] dump_stack_lvl from do_handle_IPI+0x308/0x334 [ 169.855346] do_handle_IPI from ipi_handler+0x20/0x28 [ 169.860412] ipi_handler from handle_percpu_devid_irq+0xcc/0x320 [ 169.866485] handle_percpu_devid_irq from generic_handle_domain_irq+0x30/0x40 [ 169.873657] generic_handle_domain_irq from gic_handle_irq+0x90/0xb0 [ 169.880035] gic_handle_irq from generic_handle_arch_irq+0x34/0x44 [ 169.886260] generic_handle_arch_irq from call_with_stack+0x18/0x20 [ 169.892547] call_with_stack from __irq_svc+0x9c/0xb8 [ 169.897644] Exception stack(0xf0181ee0 to 0xf0181f28) [ 169.902709] 1ee0: 005807d2 00000000 77359400 00000010 00008272 c23b3300 f0181f80 c23b33c4 [ 169.910919] 1f00: c0427c70 c23b3400 c23b3450 00001c49 0058075e f0181f30 f6df0000 c0420798 [ 169.919158] 1f20: 600f0013 ffffffff [ 169.922637] __irq_svc from ktime_get_real_ts64+0x110/0x22c [ 169.928253] ktime_get_real_ts64 from posix_get_realtime_timespec+0x14/0x1c [ 169.935272] posix_get_realtime_timespec from sys_clock_gettime+0x64/0xc8 [ 169.942077] sys_clock_gettime from __sys_trace_return+0x0/0x10 [ 169.948028] Exception stack(0xf0181fa8 to 0xf0181ff0) [ 169.953124] 1fa0: 00000000 b61fea18 00000000 b61fea18 00000000 00000000 [ 169.961334] 1fc0: 00000000 b61fea18 b61feacc 00000193 000172a0 00000000 b59ff000 bee7f000 [ 169.969543] 1fe0: bee7f020 b61fe9c0 bee8055c bee806b8 [ 169.974639] ---[ end Kernel panic - not syncing: Fatal exception in interrupt ]--- error: Oops: 5 [#1] SMP ARM

Full test log: https://lkft.validation.linaro.org/scheduler/job/5708561#L5793

metadata: git_ref: linux-6.0.y git_repo: https://gitlab.com/Linaro/lkft/mirrors/stable/linux-stable-rc git_sha: 84429734035197a6ab8e79c852d5e4e6ed744703 git_describe: v6.0-916-g844297340351 kernel_version: 6.0.3-rc1 kernel-config: https://builds.tuxbuild.com/2GMZBBq4CuTDk9rrHpkrP7lPMTT/config build-url: https://gitlab.com/mrchapp/linux/-/pipelines/671394419 artifact-location: https://builds.tuxbuild.com/2GMZBBq4CuTDk9rrHpkrP7lPMTT toolchain: gcc-10 vmlinux.xz: https://builds.tuxbuild.com/2GMZBBq4CuTDk9rrHpkrP7lPMTT/vmlinux.xz System.map: https://builds.tuxbuild.com/2GMZBBq4CuTDk9rrHpkrP7lPMTT/System.map

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