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Subjectselftests: net: pmtu.sh: BUG: unable to handle page fault for address: 2509c000
Following kernel BUG noticed on qemu_i386 while testing
selftests: net: pmtu.sh with kselftest merge config build image [1] & [2]
and after this BUG test hung.

metadata:
git_ref: master
git_repo: https://gitlab.com/Linaro/lkft/mirrors/torvalds/linux-mainline
git_sha: 672c0c5173427e6b3e2a9bbb7be51ceeec78093a
git_describe: v5.18-rc5
kernel_version: 5.18.0-rc5
kernel-config: https://builds.tuxbuild.com/28a2wrzQ62tLypUV7bgCOXEGKig/config
build-url: https://gitlab.com/Linaro/lkft/mirrors/torvalds/linux-mainline/-/pipelines/528952197
artifact-location: https://builds.tuxbuild.com/28a2wrzQ62tLypUV7bgCOXEGKig
toolchain: gcc-11


Test log:
---------
# selftests: net: pmtu.sh
[ 468.730000] ip (15022) used greatest stack depth: 4232 bytes left

<trim>

# TEST: ipv6: cleanup of cached exceptions [ OK ]
[ 587.633640] IPv6: ADDRCONF(NETDEV_CHANGE): veth_A-R1: link becomes ready
[ 587.695867] IPv6: ADDRCONF(NETDEV_CHANGE): veth_A-R2: link becomes ready
[ 587.758384] IPv6: ADDRCONF(NETDEV_CHANGE): veth_B-R1: link becomes ready
[ 587.821528] IPv6: ADDRCONF(NETDEV_CHANGE): veth_B-R2: link becomes ready
# TEST: ipv6: cleanup of cached exceptions - nexthop objects [ OK ]
[ 591.442819] BUG: unable to handle page fault for address: 2509c000
[ 591.444468] #PF: supervisor read access in kernel mode
[ 591.445810] #PF: error_code(0x0000) - not-present page
[ 591.447175] *pde = 00000000
[ 591.448121] Oops: 0000 [#1] PREEMPT SMP
[ 591.449350] CPU: 3 PID: 0 Comm: swapper/3 Not tainted 5.18.0-rc5 #1
[ 591.451373] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996),
BIOS 1.12.0-1 04/01/2014
[ 591.453404] EIP: percpu_counter_add_batch+0x2e/0xe0
[ 591.454134] Code: ec 20 89 5d f4 89 c3 b8 01 00 00 00 89 75 f8 89
7d fc 89 55 ec 89 4d f0 e8 3f f0 a3 ff b8 5f c4 c7 cf e8 e5 43 bd 00
8b 4b 34 <64> 8b 39 89 7d e0 89 fe 8b 45 08 c1 ff 1f 03 75 ec 13 7d f0
89 45
[ 591.456840] EAX: 00000003 EBX: c60fd540 ECX: 00000000 EDX: cfc7c45f
[ 591.457755] ESI: 00000000 EDI: c11a92c0 EBP: c1251f40 ESP: c1251f20
[ 591.458686] DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068 EFLAGS: 00210202
[ 591.459688] CR0: 80050033 CR2: 2509c000 CR3: 05401000 CR4: 003506d0
[ 591.460628] Call Trace:
[ 591.461009] <SOFTIRQ>
[ 591.461366] dst_destroy+0xac/0xe0
[ 591.461879] dst_destroy_rcu+0x10/0x20
[ 591.462438] rcu_core+0x354/0xa50
[ 591.462942] ? rcu_core+0x2fd/0xa50
[ 591.463462] rcu_core_si+0xd/0x10
[ 591.463962] __do_softirq+0x14f/0x4ae
[ 591.464509] ? __entry_text_end+0x8/0x8
[ 591.465108] call_on_stack+0x4c/0x60
[ 591.465637] </SOFTIRQ>
[ 591.466010] ? __irq_exit_rcu+0xca/0x130
[ 591.466588] ? irq_exit_rcu+0xd/0x20
[ 591.467132] ? sysvec_apic_timer_interrupt+0x36/0x50
[ 591.467868] ? handle_exception+0x133/0x133
[ 591.468481] ? __sched_text_end+0x2/0x2
[ 591.469079] ? sysvec_call_function_single+0x50/0x50
[ 591.469804] ? default_idle+0x13/0x20
[ 591.470346] ? sysvec_call_function_single+0x50/0x50
[ 591.471068] ? default_idle+0x13/0x20
[ 591.471605] ? arch_cpu_idle+0x12/0x20
[ 591.472164] ? default_idle_call+0x52/0xa0
[ 591.472788] ? do_idle+0x20a/0x270
[ 591.473289] ? cpu_startup_entry+0x20/0x30
[ 591.473890] ? cpu_startup_entry+0x25/0x30
[ 591.474489] ? start_secondary+0x10f/0x140
[ 591.475098] ? startup_32_smp+0x161/0x164
[ 591.475687] Modules linked in: sit xt_policy iptable_filter
ip_tables x_tables veth fuse [last unloaded: test_blackhole_dev]
[ 591.477321] CR2: 000000002509c000
[ 591.477818] ---[ end trace 0000000000000000 ]---
[ 591.478500] EIP: percpu_counter_add_batch+0x2e/0xe0
[ 591.479218] Code: ec 20 89 5d f4 89 c3 b8 01 00 00 00 89 75 f8 89
7d fc 89 55 ec 89 4d f0 e8 3f f0 a3 ff b8 5f c4 c7 cf e8 e5 43 bd 00
8b 4b 34 <64> 8b 39 89 7d e0 89 fe 8b 45 08 c1 ff 1f 03 75 ec 13 7d f0
89 45
[ 591.481915] EAX: 00000003 EBX: c60fd540 ECX: 00000000 EDX: cfc7c45f
[ 591.482829] ESI: 00000000 EDI: c11a92c0 EBP: c1251f40 ESP: c1251f20
[ 591.483739] DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068 EFLAGS: 00210202
[ 591.484744] CR0: 80050033 CR2: 2509c000 CR3: 05401000 CR4: 003506d0
[ 591.485656] Kernel panic - not syncing: Fatal exception in interrupt
[ 591.486680] Kernel Offset: disabled
[ 591.487215] ---[ end Kernel panic - not syncing: Fatal exception in
interrupt ]---

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

--
Linaro LKFT
https://lkft.linaro.org

[1] https://lkft.validation.linaro.org/scheduler/job/4976107#L4726
[2] https://qa-reports.linaro.org/lkft/linux-mainline-master/build/v5.18-rc5/testrun/9320607/suite/linux-log-parser/test/check-kernel-bug-4976107/log

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