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SubjectRe: [PATCH v3 6/6] RISC-V: Do not use cpumask data structure for hartid bitmap
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On 1/25/22 12:52, Geert Uytterhoeven wrote:
> Hi Atish,
>
> On Tue, Jan 25, 2022 at 9:17 PM Atish Patra <atishp@atishpatra.org> wrote:
>> On Tue, Jan 25, 2022 at 12:12 PM Geert Uytterhoeven
>> <geert@linux-m68k.org> wrote:
>>> On Thu, Jan 20, 2022 at 10:12 AM Atish Patra <atishp@rivosinc.com> wrote:
>>>> Currently, SBI APIs accept a hartmask that is generated from struct
>>>> cpumask. Cpumask data structure can hold upto NR_CPUs value. Thus, it
>>>> is not the correct data structure for hartids as it can be higher
>>>> than NR_CPUs for platforms with sparse or discontguous hartids.
>>>>
>>>> Remove all association between hartid mask and struct cpumask.
>>>>
>>>> Reviewed-by: Anup Patel <anup@brainfault.org> (For Linux RISC-V changes)
>>>> Acked-by: Anup Patel <anup@brainfault.org> (For KVM RISC-V changes)
>>>> Signed-off-by: Atish Patra <atishp@rivosinc.com>
>>> Thanks for your patch, which is now commit 26fb751ca37846c9 ("RISC-V:
>>> Do not use cpumask data structure for hartid bitmap") in v5.17-rc1.
>>>
>>> I am having an issue with random userspace SEGVs on Starlight Beta
>>> (which needs out-of-tree patches). It doesn't always manifest
>>> itself immediately, so it took a while to bisect, but I suspect the
>>> above commit to be the culprit.
>> I have never seen one before during my testing. How frequently do you see them?
>> Does it happen while running anything or just idle user space results
>> in SEGVs randomly.
> Sometimes they happen during startup (lots of failures from systemd),
> sometimes they happen later, during interactive work.
> Sometimes while idle, and something runs in the background (e.g. mandb).
>
>> Do you have a trace that I can look into ?
> # apt update
> [ 807.499050] apt[258]: unhandled signal 11 code 0x1 at
> 0xffffff8300060020 in libapt-pkg.so.6.0.0[3fa49ac000+174000]
> [ 807.509548] CPU: 0 PID: 258 Comm: apt Not tainted
> 5.16.0-starlight-11192-g26fb751ca378-dirty #153
> [ 807.518674] Hardware name: BeagleV Starlight Beta (DT)
> [ 807.524077] epc : 0000003fa4a47a0a ra : 0000003fa4a479fc sp :
> 0000003fcb4b39b0
> [ 807.531383] gp : 0000002adcef4800 tp : 0000003fa43287b0 t0 :
> 0000000000000001
> [ 807.538603] t1 : 0000000000000009 t2 : 00000000000003ff s0 :
> 0000000000000000
> [ 807.545887] s1 : 0000002adcf3cb60 a0 : 0000000000000003 a1 :
> 0000000000000000
> [ 807.553167] a2 : 0000003fcb4b3a30 a3 : 0000000000000000 a4 :
> 0000002adcf3cc1c
> [ 807.560390] a5 : 0007000300060000 a6 : 0000000000000003 a7 :
> 1999999999999999
> [ 807.567654] s2 : 0000003fcb4b3a28 s3 : 0000000000000002 s4 :
> 0000003fcb4b3a30
> [ 807.575039] s5 : 0000003fa4baa810 s6 : 0000000000000010 s7 :
> 0000002adcf19a40
> [ 807.582363] s8 : 0000003fcb4b4010 s9 : 0000003fa4baa810 s10:
> 0000003fcb4b3e90
> [ 807.589606] s11: 0000003fa4b2a528 t3 : 0000000000000000 t4 :
> 0000003fa47906a0
> [ 807.596891] t5 : 0000000000000005 t6 : ffffffffffffffff
> [ 807.602302] status: 0000000200004020 badaddr: ffffff8300060020
> cause: 000000000000000d
>
> (-dirty due to Starlight DTS and driver updates)
>
> Gr{oetje,eeting}s,
>
> Geert
>
> --

I'm not sure if it's related, but I'm also seeing a systemd segfault on
boot with the HiFive Unmatched and 5.17.0-rc1. I don't have the dmesg
dump, but here's the journalctl dump. It was built before the tag, so it
says 5.16.0.

Jan 23 02:41:50 riscv64 systemd-udevd[551]: mmcblk0p12: Failed to wait
for spawned command '/usr/bin/unshare -m /usr/bin/snap auto-import
--mount=/dev/mmcblk0p12': Invalid argument
Jan 23 02:41:50 riscv64 systemd-udevd[412]: mmcblk0p12: Process
'/usr/bin/unshare -m /usr/bin/snap auto-import --mount=/dev/mmcblk0p12'
terminated by signal SEGV.
Jan 23 02:41:50 riscv64 kernel: systemd-udevd[551]: unhandled signal 11
code 0x1 at 0x0000000003938700 in udevadm[3fa7eee000+b1000]
Jan 23 02:41:50 riscv64 kernel: CPU: 2 PID: 551 Comm: systemd-udevd Not
tainted 5.16.0 #1
Jan 23 02:41:50 riscv64 kernel: Hardware name: SiFive HiFive Unmatched
A00 (DT)
Jan 23 02:41:50 riscv64 kernel: epc : 0000003fa7f14104 ra :
0000003fa7f14102 sp : 0000003fe3da5320
Jan 23 02:41:50 riscv64 kernel:  gp : 0000003fa7fc3ef8 tp :
0000003fa79f8530 t0 : 0000003fe3da38f0
Jan 23 02:41:50 riscv64 kernel:  t1 : 0000003fa7f0425c t2 :
0000000000000000 s0 : 0000003fcd046d88
Jan 23 02:41:50 riscv64 kernel:  s1 : 0000003fcd046d60 a0 :
ffffffffffffffff a1 : 0000003fcd0cb330
Jan 23 02:41:50 riscv64 kernel:  a2 : 0000003fcd043028 a3 :
0000000000000007 a4 : c98b6a1813e46d00
Jan 23 02:41:50 riscv64 kernel:  a5 : ffffffffffffffff a6 :
fefefefefefefeff a7 : 0000000000000039
Jan 23 02:41:50 riscv64 kernel:  s2 : 0000000000000000 s3 :
ffffffffffffffea s4 : 0000000000000000
Jan 23 02:41:50 riscv64 kernel:  s5 : 0000003fe3da5378 s6 :
ffffffffffffffea s7 : 0000000003938700
Jan 23 02:41:50 riscv64 kernel:  s8 : 0000003fe3da53e0 s9 :
0000003fe3da53d8 s10: 0000003fa7fc200c
Jan 23 02:41:50 riscv64 kernel:  s11: 0000000000081000 t3 :
0000003fa7db3822 t4 : 0000000000000000
Jan 23 02:41:50 riscv64 kernel:  t5 : 0000003fe3da38c8 t6 : 000000000000002a
Jan 23 02:41:50 riscv64 kernel: status: 0000000200004020 badaddr:
0000000003938700 cause: 000000000000000d
Jan 23 02:41:50 riscv64 systemd-udevd[412]: mmcblk0p12: Failed to wait
for spawned command '/usr/bin/unshare -m /usr/bin/snap auto-import
--mount=/dev/mmcblk0p12': Input/output error
Jan 23 02:41:50 riscv64 systemd-udevd[412]: mmcblk0p12: Failed to
execute '/usr/bin/unshare -m /usr/bin/snap auto-import
--mount=/dev/mmcblk0p12', ignoring: Input/output error

I'll try removing this patch.

Ron

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