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SubjectUBSAN: Undefined behaviour in arch/x86/events/intel/p6.c:116:29
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While testing 5.4 on a Dell D600 (32-bit), I noticed the old UBSAN warnings from p6 perf events.
I remember having seen these warnings on other p6 era computers too.

[ 2.795167] ================================================================================
[ 2.795206] UBSAN: Undefined behaviour in arch/x86/events/intel/p6.c:116:29
[ 2.795235] index 8 is out of range for type 'u64 [8]'
[ 2.795265] CPU: 0 PID: 1 Comm: swapper Not tainted 5.4.0-03419-g386403a115f9-dirty #18
[ 2.795266] Hardware name: Dell Computer Corporation Latitude D600 /0X2034, BIOS A16 06/29/2005
[ 2.795268] Call Trace:
[ 2.795283] dump_stack+0x16/0x19
[ 2.795290] ubsan_epilogue+0xb/0x29
[ 2.795293] __ubsan_handle_out_of_bounds.cold+0x43/0x48
[ 2.795299] ? sysfs_add_file_mode_ns+0xad/0x180
[ 2.795304] p6_pmu_event_map+0x3b/0x50
[ 2.795306] is_visible+0x25/0x30
[ 2.795308] ? collect_events+0x150/0x150
[ 2.795310] internal_create_group+0xd8/0x3e0
[ 2.795312] ? collect_events+0x150/0x150
[ 2.795314] internal_create_groups.part.0+0x34/0x80
[ 2.795317] sysfs_create_groups+0x10/0x20
[ 2.795321] device_add+0x536/0x5a0
[ 2.795326] ? kvasprintf_const+0x59/0x90
[ 2.795331] ? kfree_const+0xf/0x30
[ 2.795334] ? kobject_set_name_vargs+0x6a/0xa0
[ 2.795338] pmu_dev_alloc+0x8e/0xe0
[ 2.795344] perf_event_sysfs_init+0x40/0x78
[ 2.795346] ? stack_map_init+0x17/0x17
[ 2.795347] do_one_initcall+0x7a/0x1b3
[ 2.795351] ? do_early_param+0x75/0x75
[ 2.795354] kernel_init_freeable+0x1ae/0x230
[ 2.795357] ? rest_init+0x6d/0x6d
[ 2.795359] kernel_init+0x9/0xf3
[ 2.795361] ? rest_init+0x6d/0x6d
[ 2.795363] ret_from_fork+0x2e/0x38
[ 2.795364] ================================================================================
[ 2.795396] ================================================================================
[ 2.795427] UBSAN: Undefined behaviour in arch/x86/events/intel/p6.c:116:29
[ 2.795456] load of address (ptrval) with insufficient space
[ 2.795483] for an object of type 'const u64'
[ 2.795510] CPU: 0 PID: 1 Comm: swapper Not tainted 5.4.0-03419-g386403a115f9-dirty #18
[ 2.795511] Hardware name: Dell Computer Corporation Latitude D600 /0X2034, BIOS A16 06/29/2005
[ 2.795512] Call Trace:
[ 2.795514] dump_stack+0x16/0x19
[ 2.795517] ubsan_epilogue+0xb/0x29
[ 2.795519] ubsan_type_mismatch_common.cold+0xd6/0xdb
[ 2.795522] __ubsan_handle_type_mismatch_v1+0x2d/0x40
[ 2.795524] p6_pmu_event_map+0x4b/0x50
[ 2.795525] is_visible+0x25/0x30
[ 2.795527] ? collect_events+0x150/0x150
[ 2.795529] internal_create_group+0xd8/0x3e0
[ 2.795531] ? collect_events+0x150/0x150
[ 2.795533] internal_create_groups.part.0+0x34/0x80
[ 2.795536] sysfs_create_groups+0x10/0x20
[ 2.795537] device_add+0x536/0x5a0
[ 2.795540] ? kvasprintf_const+0x59/0x90
[ 2.795542] ? kfree_const+0xf/0x30
[ 2.795543] ? kobject_set_name_vargs+0x6a/0xa0
[ 2.795546] pmu_dev_alloc+0x8e/0xe0
[ 2.795548] perf_event_sysfs_init+0x40/0x78
[ 2.795550] ? stack_map_init+0x17/0x17
[ 2.795551] do_one_initcall+0x7a/0x1b3
[ 2.795553] ? do_early_param+0x75/0x75
[ 2.795556] kernel_init_freeable+0x1ae/0x230
[ 2.795558] ? rest_init+0x6d/0x6d
[ 2.795560] kernel_init+0x9/0xf3
[ 2.795561] ? rest_init+0x6d/0x6d
[ 2.795563] ret_from_fork+0x2e/0x38
[ 2.795565] ================================================================================


--
Meelis Roos <mroos@linux.ee>

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