next-20240905: WARNING: at arch/arm64/include/asm/pkeys.h:40 do_mmap

[Naresh Kamboju]

The following kernel warning noticed while running the LTP test case
LTP syscalls mlock03 ( mmap03 ) on
  - Arm DUT Juno-r2
  - Qcomm DUT Dragonboard-410c

running Linux next-20240905, next-20240906 and next-20240909 kernel.

First seen on next-20240905
  Good: next-20240904
  BAD:  next-20240905..next-20240909

Reported-by: Linux Kernel Functional Testing <lkft@xxxxxxxxxx>

Warning log:
----------
[    0.000000] Linux version 6.11.0-rc6-next-20240905
(tuxmake@tuxmake) (aarch64-linux-gnu-gcc (Debian 13.3.0-5) 13.3.0, GNU
ld (GNU Binutils for Debian) 2.43) #1 SMP PREEMPT @1725536306
[    0.000000] KASLR disabled due to lack of seed
[    0.000000] Machine model: ARM Juno development board (r2)
..
mlock03.c:58: TINFO: mlock [aaaaddae1000,aaaaddafd000]
mlock03.c:62: TINFO: munlock [aaaaddae1000,aaaaddafd000]
[  795.850426] ------------[ cut here ]------------
[  795.857261] WARNING: CPU: 5 PID: 101577 at
arch/arm64/include/asm/pkeys.h:40 do_mmap
(arch/arm64/include/asm/pkeys.h:40 (discriminator 1) mm/mmap.c:338
(discriminator 1))
[  795.868833] Modules linked in: tun overlay btrfs blake2b_generic
libcrc32c xor xor_neon raid6_pq zstd_compress panfrost tda998x
onboard_usb_dev drm_shmem_helper hdlcd crct10dif_ce cec gpu_sched
drm_dma_helper drm_kms_helper fuse drm backlight dm_mod ip_tables
x_tables
[  795.895379] CPU: 5 UID: 0 PID: 101577 Comm: mmap03 Not tainted
6.11.0-rc6-next-20240905 #1
[  795.906430] Hardware name: ARM Juno development board (r2) (DT)
[  795.915135] pstate: 60000005 (nZCv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--)
[  795.924881] pc : do_mmap (arch/arm64/include/asm/pkeys.h:40
(discriminator 1) mm/mmap.c:338 (discriminator 1))
[  795.931236] lr : vm_mmap_pgoff (mm/util.c:588)
[  795.938113] sp : ffff80008ba0bc90
[  795.944206] x29: ffff80008ba0bc90 x28: 0000000000000001 x27: ffff0008329cf800
[  795.954128] x26: ffff0008329cf800 x25: ffff000822140cc0 x24: 0000000000000000
[  795.964050] x23: ffff80008ba0bd20 x22: 0000000000000004 x21: 0000000000000000
[  795.973972] x20: 0000000000000001 x19: 0000000000001000 x18: 0000000000000000
[  795.983895] x17: 0000000000000000 x16: 0000000000000000 x15: 0000000000000000
[  795.993817] x14: 0000000000000000 x13: 0000000000000000 x12: 0000000000000000
[  796.003739] x11: 0000000000000000 x10: 0000000000000000 x9 : ffff80008032e2c4
[  796.013661] x8 : ffff000827e64c00 x7 : ffff80008ba0bd20 x6 : 0000000000000000
[  796.023583] x5 : 0000000000000000 x4 : 0000000000000001 x3 : 0000000000000004
[  796.033505] x2 : 0000000000001000 x1 : 0000000000000011 x0 : 000000000000fffa
[  796.043428] Call trace:
[  796.048651] do_mmap (arch/arm64/include/asm/pkeys.h:40
(discriminator 1) mm/mmap.c:338 (discriminator 1))
[  796.054658] vm_mmap_pgoff (mm/util.c:588)
[  796.061187] ksys_mmap_pgoff (mm/mmap.c:542)
[  796.067980] __arm64_sys_mmap (arch/arm64/kernel/sys.c:21)
[  796.074597] invoke_syscall (arch/arm64/include/asm/current.h:19
arch/arm64/kernel/syscall.c:54)
[  796.081213] el0_svc_common.constprop.0
(include/linux/thread_info.h:127 (discriminator 2)
arch/arm64/kernel/syscall.c:140 (discriminator 2))
[  796.088699] do_el0_svc (arch/arm64/kernel/syscall.c:152)
[  796.094879] el0_svc (arch/arm64/include/asm/irqflags.h:82
(discriminator 1) arch/arm64/include/asm/irqflags.h:123 (discriminator
1) arch/arm64/include/asm/irqflags.h:136 (discriminator 1)
arch/arm64/kernel/entry-common.c:165 (discriminator 1)
arch/arm64/kernel/entry-common.c:178 (discriminator 1)
arch/arm64/kernel/entry-common.c:713 (discriminator 1))
[  796.100799] el0t_64_sync_handler (arch/arm64/kernel/entry-common.c:731)
[  796.108024] el0t_64_sync (arch/arm64/kernel/entry.S:598)
[  796.114467] ---[ end trace 0000000000000000 ]---

boot Log links,
--------
  - https://qa-reports.linaro.org/lkft/linux-next-master/build/next-20240905/testrun/25069344/suite/log-parser-test/test/check-kernel-exception-warning-cpu-pid-at-archarmincludeasmpkeysh-do_mmap/log
  - https://lkft.validation.linaro.org/scheduler/job/7842087#L21916
  - https://lkft.validation.linaro.org/scheduler/job/7847924#L23191

Test results history:
----------
  - https://qa-reports.linaro.org/lkft/linux-next-master/build/next-20240909/testrun/25081195/suite/log-parser-test/test/check-kernel-exception-warning-cpu-pid-at-archarmincludeasmpkeysh-do_mmap/history/

metadata:
----
  git describe: next-20240905
  git repo: https://gitlab.com/Linaro/lkft/mirrors/next/linux-next
  git sha: ad40aff1edffeccc412cde93894196dca7bc739e
  kernel config:
https://storage.tuxsuite.com/public/linaro/lkft/builds/2leMFe4WompPEOUNN7ODxtTMCxf/config
  build url: https://storage.tuxsuite.com/public/linaro/lkft/builds/2leMFe4WompPEOUNN7ODxtTMCxf/
  toolchain: gcc-13

Steps to reproduce:
---------
- https://tuxapi.tuxsuite.com/v1/groups/linaro/projects/lkft/tests/2leMISlsoJqQdTCCzBmuVwKHq9m/reproducer
- https://tuxapi.tuxsuite.com/v1/groups/linaro/projects/lkft/tests/2leMISlsoJqQdTCCzBmuVwKHq9m/tux_plan

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