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Subject[PATCH 0/1] arm64: Add stack unwinder unit tests
Date
Hi,

Here is my initial arm64 unwinder test support. Code is based on s390
unwinder tests, while errors introduced are mine. I am hopping that it
will be useful for testing and validating upcoming arm64
arch_stack_walk_reliable() support.

This patch is was tested on top of latest Madhavan work [1].

As expected unwinding trough IRQ fails. Here is the output of current
statue of affair:

# modprobe test_unwind
[ 14.905945] # Subtest: test_unwind
[ 14.905948] 1..1
[ 14.905949] # Subtest: test_unwind_flags
[ 14.906243] ok 1 - UWM_DEFAULT
[ 14.906375] ok 2 - UWM_REGS
[ 14.906902] ok 3 - UWM_CALLER
[ 14.907010] ok 4 - UWM_CALLER | UWM_REGS
[ 14.907220] ok 5 - UWM_THREAD
[ 14.907445] ok 6 - UWM_THREAD | UWM_CALLER
[ 14.912600] # test_unwind_flags: test_unwind+0x70/0x280 [test_unwind]
[ 14.912602] # test_unwind_flags: unwindme_func4+0x64/0x260 [test_unwind]
[ 14.912604] # test_unwind_flags: unwindme_func3+0x58/0x80 [test_unwind]
[ 14.912605] # test_unwind_flags: unwindme_func2+0x18/0x28 [test_unwind]
[ 14.912606] # test_unwind_flags: unwindme_func1+0x18/0x28 [test_unwind]
[ 14.912607] # test_unwind_flags: unwindme_timer_fn+0x38/0x54 [test_unwind]
[ 14.912608] # test_unwind_flags: call_timer_fn+0x38/0x1e0
[ 14.912609] # test_unwind_flags: run_timer_softirq+0x500/0x550
[ 14.912610] # test_unwind_flags: __do_softirq+0x124/0x3bc
[ 14.912611] # test_unwind_flags: irq_exit_rcu+0xf0/0x110
[ 14.912611] # test_unwind_flags: el1_interrupt+0x3c/0x70
[ 14.912612] # test_unwind_flags: el1h_64_irq_handler+0x18/0x28
[ 14.912612] # test_unwind_flags: el1h_64_irq+0x64/0x68
[ 14.912613] # test_unwind_flags: arch_cpu_idle+0x18/0x28
[ 14.912614] # test_unwind_flags: default_idle_call+0x6c/0x1d0
[ 14.912614] # test_unwind_flags: do_idle+0x1f0/0x290
[ 14.912615] # test_unwind_flags: cpu_startup_entry+0x30/0x38
[ 14.912615] # test_unwind_flags: kernel_init+0x0/0x140
[ 14.912616] # test_unwind_flags: arch_post_acpi_subsys_init+0x0/0x28
[ 14.912617] # test_unwind_flags: start_kernel+0x6dc/0x718
[ 14.912618] # test_unwind_flags: __primary_switched+0xc0/0xc8
[ 14.912618] # test_unwind_flags:
[ 14.912644] # test_unwind_flags: EXPECTATION FAILED at arch/arm64/kernel/test_unwind.c:501
[ 14.912644] Expected 0 == test_unwind_irq(&u), but
[ 14.912644] test_unwind_irq(&u) == -22
[ 14.912656] not ok 7 - UWM_IRQ
[ 14.924625] # test_unwind_flags: unwindme_func4+0xa0/0x260 [test_unwind]
[ 14.924630] # test_unwind_flags: unwindme_func3+0x58/0x80 [test_unwind]
[ 14.924632] # test_unwind_flags: unwindme_func2+0x18/0x28 [test_unwind]
[ 14.924634] # test_unwind_flags: unwindme_func1+0x18/0x28 [test_unwind]
[ 14.924636] # test_unwind_flags: unwindme_timer_fn+0x38/0x54 [test_unwind]
[ 14.924638] # test_unwind_flags: call_timer_fn+0x38/0x1e0
[ 14.924639] # test_unwind_flags: run_timer_softirq+0x500/0x550
[ 14.924641] # test_unwind_flags: __do_softirq+0x124/0x3bc
[ 14.924643] # test_unwind_flags: irq_exit_rcu+0xf0/0x110
[ 14.924645] # test_unwind_flags: el1_interrupt+0x3c/0x70
[ 14.924646] # test_unwind_flags: el1h_64_irq_handler+0x18/0x28
[ 14.924647] # test_unwind_flags: el1h_64_irq+0x64/0x68
[ 14.924648] # test_unwind_flags: arch_cpu_idle+0x18/0x28
[ 14.924649] # test_unwind_flags: default_idle_call+0x6c/0x1d0
[ 14.924650] # test_unwind_flags: do_idle+0x1f0/0x290
[ 14.924651] # test_unwind_flags: cpu_startup_entry+0x30/0x38
[ 14.924653] # test_unwind_flags: kernel_init+0x0/0x140
[ 14.924654] # test_unwind_flags: arch_post_acpi_subsys_init+0x0/0x28
[ 14.924655] # test_unwind_flags: start_kernel+0x6dc/0x718
[ 14.924656] # test_unwind_flags: __primary_switched+0xc0/0xc8
[ 14.924657] # test_unwind_flags:
[ 14.924677] # test_unwind_flags: EXPECTATION FAILED at arch/arm64/kernel/test_unwind.c:501
[ 14.924677] Expected 0 == test_unwind_irq(&u), but
[ 14.924677] test_unwind_irq(&u) == -22
[ 14.924724] not ok 8 - UWM_IRQ | UWM_REGS
[ 14.936710] # test_unwind_flags: test_unwind+0x70/0x280 [test_unwind]
[ 14.936717] # test_unwind_flags: unwindme_func4+0x64/0x260 [test_unwind]
[ 14.936720] # test_unwind_flags: unwindme_func3+0x58/0x80 [test_unwind]
[ 14.936722] # test_unwind_flags: unwindme_func2+0x18/0x28 [test_unwind]
[ 14.936725] # test_unwind_flags: unwindme_func1+0x18/0x28 [test_unwind]
[ 14.936727] # test_unwind_flags: unwindme_timer_fn+0x38/0x54 [test_unwind]
[ 14.936729] # test_unwind_flags: call_timer_fn+0x38/0x1e0
[ 14.936732] # test_unwind_flags: run_timer_softirq+0x500/0x550
[ 14.936734] # test_unwind_flags: __do_softirq+0x124/0x3bc
[ 14.936736] # test_unwind_flags: irq_exit_rcu+0xf0/0x110
[ 14.936738] # test_unwind_flags: el1_interrupt+0x3c/0x70
[ 14.936739] # test_unwind_flags: el1h_64_irq_handler+0x18/0x28
[ 14.936741] # test_unwind_flags: el1h_64_irq+0x64/0x68
[ 14.936743] # test_unwind_flags: arch_cpu_idle+0x18/0x28
[ 14.936744] # test_unwind_flags: default_idle_call+0x6c/0x1d0
[ 14.936746] # test_unwind_flags: do_idle+0x1f0/0x290
[ 14.936748] # test_unwind_flags: cpu_startup_entry+0x30/0x38
[ 14.936749] # test_unwind_flags: secondary_start_kernel+0x198/0x1c8
[ 14.936751] # test_unwind_flags: __secondary_switched+0xa0/0xa4
[ 14.936753] # test_unwind_flags:
[ 14.936839] # test_unwind_flags: EXPECTATION FAILED at arch/arm64/kernel/test_unwind.c:501
[ 14.936839] Expected 0 == test_unwind_irq(&u), but
[ 14.936839] test_unwind_irq(&u) == -22
[ 14.936874] not ok 9 - UWM_IRQ | UWM_CALLER
[ 14.944623] # test_unwind_flags: unwindme_func3+0x3c/0x80 [test_unwind]
[ 14.944628] # test_unwind_flags: unwindme_func2+0x18/0x28 [test_unwind]
[ 14.944631] # test_unwind_flags: unwindme_func1+0x18/0x28 [test_unwind]
[ 14.944633] # test_unwind_flags: unwindme_timer_fn+0x38/0x54 [test_unwind]
[ 14.944636] # test_unwind_flags: call_timer_fn+0x38/0x1e0
[ 14.944638] # test_unwind_flags: run_timer_softirq+0x500/0x550
[ 14.944641] # test_unwind_flags: __do_softirq+0x124/0x3bc
[ 14.944643] # test_unwind_flags: irq_exit_rcu+0xf0/0x110
[ 14.944646] # test_unwind_flags: el1_interrupt+0x3c/0x70
[ 14.944649] # test_unwind_flags: el1h_64_irq_handler+0x18/0x28
[ 14.944650] # test_unwind_flags: el1h_64_irq+0x64/0x68
[ 14.944652] # test_unwind_flags: arch_cpu_idle+0x18/0x28
[ 14.944654] # test_unwind_flags: default_idle_call+0x6c/0x1d0
[ 14.944656] # test_unwind_flags: do_idle+0x1f0/0x290
[ 14.944657] # test_unwind_flags: cpu_startup_entry+0x2c/0x38
[ 14.944659] # test_unwind_flags: secondary_start_kernel+0x198/0x1c8
[ 14.944661] # test_unwind_flags: __secondary_switched+0xa0/0xa4
[ 14.944662] # test_unwind_flags:
[ 14.944687] # test_unwind_flags: EXPECTATION FAILED at arch/arm64/kernel/test_unwind.c:501
[ 14.944687] Expected 0 == test_unwind_irq(&u), but
[ 14.944687] test_unwind_irq(&u) == -22
[ 14.944737] not ok 10 - UWM_IRQ | UWM_CALLER | UWM_REGS
[ 14.945009] ok 11 - UWM_REGS
[ 14.945174] ok 12 - UWM_KPROBE_ON_FTRACE
[ 14.945299] ok 13 - UWM_KPROBE_ON_FTRACE | UWM_REGS
[ 14.946894] # test_unwind_flags: test_unwind+0x70/0x280 [test_unwind]
[ 14.946902] # test_unwind_flags: test_unwind_ftrace_handler+0x28/0x40 [test_unwind]
[ 14.946904] # test_unwind_flags: arch_ftrace_ops_list_func+0xd8/0x1b0
[ 14.946906] # test_unwind_flags: ftrace_call+0x4/0x2c
[ 14.946908] # test_unwind_flags: test_unwind_ftraced_func+0x8/0x28 [test_unwind]
[ 14.946910] # test_unwind_flags: unwindme_func4+0x1b4/0x260 [test_unwind]
[ 14.946912] # test_unwind_flags: unwindme_func3+0x58/0x80 [test_unwind]
[ 14.946915] # test_unwind_flags: unwindme_func2+0x18/0x28 [test_unwind]
[ 14.946917] # test_unwind_flags: unwindme_func1+0x18/0x28 [test_unwind]
[ 14.946918] # test_unwind_flags: test_unwind_flags+0x5c/0x288 [test_unwind]
[ 14.946920] # test_unwind_flags: kunit_try_run_case+0x58/0xc0 [kunit]
[ 14.946921] # test_unwind_flags: kunit_generic_run_threadfn_adapter+0x28/0x38 [kunit]
[ 14.946923] # test_unwind_flags: kthread+0x118/0x128
[ 14.946924] # test_unwind_flags: ret_from_fork+0x10/0x20
[ 14.946925] # test_unwind_flags:
[ 15.104639] # test_unwind_flags: EXPECTATION FAILED at arch/arm64/kernel/test_unwind.c:503
[ 15.104639] Expected 0 == unwindme_func1(&u), but
[ 15.104639] unwindme_func1(&u) == -22
[ 15.104691] not ok 14 - UWM_FTRACE
[ 15.240652] ok 15 - UWM_FTRACE | UWM_REGS
[ 15.264620] ok 16 - UWM_KRETPROBE
[ 15.292603] ok 17 - UWM_KRETPROBE | UWM_REGS
[ 15.293173] # test_unwind_flags: test_unwind+0x70/0x280 [test_unwind]
[ 15.293175] # test_unwind_flags: kretprobe_ret_handler+0x38/0x50 [test_unwind]
[ 15.293177] # test_unwind_flags: __kretprobe_trampoline_handler+0xec/0x188
[ 15.293178] # test_unwind_flags: trampoline_probe_handler+0x30/0x50
[ 15.293180] # test_unwind_flags: __kretprobe_trampoline+0x74/0xc8
[ 15.293181] # test_unwind_flags: test_unwind_kretprobed_func_caller+0x18/0x28 [test_unwind]
[ 15.293183] # test_unwind_flags: test_unwind_kretprobe+0xac/0x148 [test_unwind]
[ 15.293185] # test_unwind_flags: unwindme_func4+0xf0/0x260 [test_unwind]
[ 15.293186] # test_unwind_flags: unwindme_func3+0x58/0x80 [test_unwind]
[ 15.293187] # test_unwind_flags: unwindme_func2+0x18/0x28 [test_unwind]
[ 15.293188] # test_unwind_flags: unwindme_func1+0x18/0x28 [test_unwind]
[ 15.293189] # test_unwind_flags: test_unwind_flags+0x5c/0x288 [test_unwind]
[ 15.293190] # test_unwind_flags: kunit_try_run_case+0x58/0xc0 [kunit]
[ 15.293191] # test_unwind_flags: kunit_generic_run_threadfn_adapter+0x28/0x38 [kunit]
[ 15.293192] # test_unwind_flags: kthread+0x118/0x128
[ 15.293192] # test_unwind_flags: ret_from_fork+0x10/0x20
[ 15.293193] # test_unwind_flags:
[ 15.308570] # test_unwind_flags: EXPECTATION FAILED at arch/arm64/kernel/test_unwind.c:503
[ 15.308570] Expected 0 == unwindme_func1(&u), but
[ 15.308570] unwindme_func1(&u) == -22
[ 15.308611] not ok 18 - UWM_KRETPROBE_HANDLER
[ 15.324616] ok 19 - UWM_KRETPROBE_HANDLER | UWM_REGS
[ 15.324620] # test_unwind_flags: pass:11 fail:6 skip:2 total:19
[ 15.324623] not ok 1 - test_unwind_flags
[ 15.324626] # Totals: pass:11 fail:6 skip:2 total:19
[ 15.324628] not ok 1 - test_unwind

Regards,
Ivan

[1] 20220617210717.27126-1-madvenka@linux.microsoft.com

Ivan T. Ivanov (1):
arm64: Add initial set of stack unwinder self tests

arch/arm64/Kconfig.debug | 12 +
arch/arm64/kernel/Makefile | 1 +
arch/arm64/kernel/stacktrace.c | 23 ++
arch/arm64/kernel/test_unwind.c | 518 ++++++++++++++++++++++++++++++++
include/linux/stacktrace.h | 1 +
5 files changed, 555 insertions(+)
create mode 100644 arch/arm64/kernel/test_unwind.c

--
2.35.3

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