Re: [git pull] drm fixes for 6.13-rc1

[Sasha Levin <sashal@kernel.org>]

On Fri, Nov 29, 2024 at 01:31:37PM -0800, Linus Torvalds wrote:
>Sasha - it would help if your warning stack dumps had line numbers
>(using decode_stacktrace.sh, which you should be familiar with, since
>you wrote it...)
>
>I realize that requires some debug info, which might slow down builds
>etc, but it would be really nice.

I don't actually do any of the testing myself: my scripts just try to
race you, pulling trees and feeding them to KernelCI/LKFT for testing.

I'm constrained by what I get out of the testing infrastructure, and
from what I see in KernelCI the kernel builds are done without debug
info (a trade-off to allow more builds/tests?).

I should be able to reuse their config and just add debug info, no?
This is what I get as output for the 32-bit issue:

[    4.495349] UBSAN: shift-out-of-bounds in include/linux/log2.h:57:13
[    4.501876] shift exponent 32 is too large for 32-bit type 'long unsigned int'
[    4.509101] CPU: 0 UID: 0 PID: 1 Comm: swapper/0 Not tainted 6.12.0 #1
[    4.510096] Hardware name: Google Shuboz/Shuboz, BIOS Google_Shuboz.13434.780.2022_10_13_1418 09/12/2022
[    4.510096] Call Trace:
[    4.510096] dump_stack_lvl (lib/dump_stack.c:108)
[    4.510096] dump_stack (lib/dump_stack.c:114)
[    4.510096] __ubsan_handle_shift_out_of_bounds (lib/ubsan.c:133 lib/ubsan.c:373)
[    4.510096] amdgpu_vm_adjust_size.cold (drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c:2083 (discriminator 1))
[    4.510096] ? __lock_release.isra.0 (kernel/locking/lockdep.c:5429)
[    4.510096] ? amdgpu_device_skip_hw_access.part.0 (drivers/gpu/drm/amd/amdgpu/amdgpu_device.c:380)
[    4.510096] ? gmc_v9_0_init_mem_ranges (include/linux/device.h:861 drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c:1994)
[    4.510096] gmc_v9_0_sw_init (drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c:2167)
[    4.510096] ? nbio_v7_0_vcn_doorbell_range (drivers/gpu/drm/amd/amdgpu/nbio_v7_0.c:103)
[    4.510096] ? gmc_v9_0_init_mem_ranges (include/linux/device.h:861 drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c:1994)
[    4.510096] amdgpu_device_ip_init (drivers/gpu/drm/amd/amdgpu/amdgpu_device.c:2319 (discriminator 1))
[    4.510096] amdgpu_device_init (drivers/gpu/drm/amd/amdgpu/amdgpu_device.c:3906)
[    4.510096] amdgpu_driver_load_kms (drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c:148)
[    4.510096] amdgpu_pci_probe (drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c:2151 (discriminator 1))
[    4.510096] ? _raw_spin_unlock_irqrestore (arch/x86/include/asm/preempt.h:95 (discriminator 1) include/linux/spinlock_api_smp.h:152 (discriminator 1) kernel/locking/spinlock.c:194 (discriminator 1))
[    4.510096] pci_device_probe (drivers/pci/pci-driver.c:324 drivers/pci/pci-driver.c:392 drivers/pci/pci-driver.c:417 drivers/pci/pci-driver.c:460)
[    4.510096] ? sysfs_create_link (fs/sysfs/symlink.c:93)
[    4.510096] really_probe (drivers/base/dd.c:652 (discriminator 1))
[    4.510096] ? _raw_spin_unlock_irq (include/linux/spinlock_api_smp.h:159 kernel/locking/spinlock.c:202)
[    4.510096] ? pm_runtime_barrier (arch/x86/include/asm/atomic.h:23 include/linux/atomic/atomic-arch-fallback.h:444 include/linux/atomic/atomic-arch-fallback.h:2404 include/linux/atomic/atomic-arch-fallback.h:2433 include/linux/atomic/atomic-instrumented.h:1508 include/linux/pm_runtime.h:140 drivers/base/power/runtime.c:1424)
[    4.510096] __driver_probe_device (drivers/base/dd.c:800)
[    4.510096] ? __driver_attach (include/linux/device.h:992 drivers/base/dd.c:1095 drivers/base/dd.c:1215 drivers/base/dd.c:1156)
[    4.510096] driver_probe_device (drivers/base/dd.c:831)
[    4.510096] __driver_attach (include/linux/device.h:992 drivers/base/dd.c:1095 drivers/base/dd.c:1215 drivers/base/dd.c:1156)
[    4.510096] ? __device_attach_driver (include/linux/list.h:154 include/linux/list.h:183 drivers/base/dd.c:140 drivers/base/dd.c:132 drivers/base/dd.c:935)
[    4.510096] bus_for_each_dev (drivers/base/bus.c:326 drivers/base/bus.c:369)
[    4.510096] driver_attach (drivers/base/dd.c:1234)
[    4.510096] ? __device_attach_driver (include/linux/list.h:154 include/linux/list.h:183 drivers/base/dd.c:140 drivers/base/dd.c:132 drivers/base/dd.c:935)
[    4.510096] bus_add_driver (drivers/base/bus.c:673)
[    4.510096] driver_register (drivers/base/driver.c:240)
[    4.510096] ? drm_sched_fence_slab_init (drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c:2894)
[    4.510096] __pci_register_driver (drivers/pci/pci-driver.c:1459)
[    4.510096] amdgpu_init (drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c:2905)
[    4.510096] do_one_initcall (arch/x86/include/asm/bitops.h:228 arch/x86/include/asm/bitops.h:240 include/asm-generic/bitops/instrumented-non-atomic.h:142 include/linux/cpumask.h:504 include/linux/cpumask.h:1082 include/trace/events/initcall.h:27 init/main.c:1237)
[    4.510096] ? rdinit_setup (init/main.c:601 (discriminator 1))
[    4.510096] ? parse_args (kernel/params.c:191 (discriminator 1))
[    4.510096] do_initcalls (init/main.c:1299 init/main.c:1316)
[    4.510096] ? rdinit_setup (init/main.c:601 (discriminator 1))
[    4.510096] kernel_init_freeable (init/main.c:1546)
[    4.510096] ? kernel_init (init/main.c:1445)
[    4.510096] ? rest_init (include/linux/rcupdate.h:787 (discriminator 5) init/main.c:703 (discriminator 5))
[    4.510096] kernel_init (init/main.c:1445)
[    4.510096] ? schedule_tail (kernel/sched/core.c:5317)
[    4.510096] ret_from_fork (arch/x86/kernel/process.c:153)
[    4.510096] ? rest_init (include/linux/rcupdate.h:787 (discriminator 5) init/main.c:703 (discriminator 5))
[    4.510096] ret_from_fork_asm (arch/x86/entry/entry_64.S:291)
[    4.510096] entry_INT80_32+0x108/0x108

...which looks reasonable?

-- 
Thanks,
Sasha