WARNING: at kernel/trace/trace.c:1727 update_max_tr_single.part.0+0xa8/0x148

[Naresh Kamboju]

While running LTP tracing test case on arm64 the following kernel warnings
noticed on linux next tag 20200814.

metadata:
  git branch: master
  git repo: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
  git commit: 4993e4fe12af2d71b6a3ad16e1fcdc566795fda1
  git describe: next-20200814
  make_kernelversion: 5.8.0
  kernel-config:
https://builds.tuxbuild.com/-2CPc32SCi8u5tWn5mkUug/kernel.config

steps to reproduce:
# Boot qemu arm64 with trace configs enabled ^.
# cd /opt/ltp
# ./runltp -f tracing

output log,
------------
ftrace_buffer_size_kb.sh: line 33: echo: write error: Cannot allocate memory
ftrace_buffer_size_kb.sh: line 33: echo: write error: Cannot allocate memory
ftrace_buffer_size_kb.sh: line 33: echo: write error: Cannot allocate memory
[   54.196774] ------------[ cut here ]------------
[   54.199689] WARNING: CPU: 2 PID: 1920 at kernel/trace/trace.c:1727
update_max_tr_single.part.0+0xa8/0x148
[   54.204796] Modules linked in: crct10dif_ce fuse
[   54.207742] CPU: 2 PID: 1920 Comm: cat Not tainted 5.8.0-next-20200814 #1
[   54.211443] Hardware name: linux,dummy-virt (DT)
[   54.214141] pstate: 80000085 (Nzcv daIf -PAN -UAO BTYPE=--)
[   54.217378] pc : update_max_tr_single.part.0+0xa8/0x148
[   54.220284] lr : update_max_tr_single.part.0+0x94/0x148
[   54.223139] sp : ffff800014e9b940
[   54.225086] x29: ffff800014e9b940 x28: ffff800012197000
[   54.228235] x27: ffff8000124e9000 x26: 0000000000000001
[   54.231345] x25: ffff800012545a00 x24: ffff80001001eb7c
[   54.234539] x23: 0000000000000002 x22: ffff800012213980
[   54.237713] x21: ffff0000e06dc9c0 x20: 0000000000000002
[   54.240884] x19: ffff800012213980 x18: 0000000000000000
[   54.244041] x17: 0000000000000000 x16: 0000000000000000
[   54.247148] x15: 0000000000000000 x14: ffff80001024fcf4
[   54.250352] x13: ffff80001024fc30 x12: ffff80001024f894
[   54.253501] x11: ffff80001024d1c8 x10: ffff800010244bc8
[   54.256671] x9 : ffff0000dec41680 x8 : 0000000000000001
[   54.259816] x7 : 00000000000002d8 x6 : 0000000000000312
[   54.262927] x5 : ffff0000fac05200 x4 : ffff0000fad73600
[   54.266093] x3 : ffff0000fad73400 x2 : 0000000000000002
[   54.269264] x1 : ffff0000fac05100 x0 : 00000000ffffffea
[   54.272513] Call trace:
[   54.274030]  update_max_tr_single.part.0+0xa8/0x148
[   54.276770]  update_max_tr_single+0x1c/0x28
[   54.279164]  check_critical_timing+0x1fc/0x210
[   54.281680]  tracer_preempt_on+0x130/0x178
[   54.283996]  trace_preempt_on+0x34/0x158
[   54.286173]  preempt_count_sub+0xb4/0xf0
[   54.288447]  _raw_spin_unlock+0x24/0x50
[   54.290607]  unmap_page_range+0x5f0/0x868
[   54.292860]  unmap_single_vma+0x90/0x120
[   54.295046]  unmap_vmas+0x78/0xf0
[   54.296983]  unmap_region+0xc0/0x128
[   54.299043]  __do_munmap+0x1bc/0x4e0
[   54.301118]  __vm_munmap+0x78/0xd8
[   54.303068]  __arm64_sys_munmap+0x3c/0x50
[   54.305373]  el0_svc_common.constprop.0+0x7c/0x198
[   54.308038]  do_el0_svc+0x2c/0x98
[   54.309936]  el0_sync_handler+0x9c/0x1b8
[   54.312168]  el0_sync+0x158/0x180
[   54.314048] ---[ end trace a683c8f878b562c7 ]---

<trim>

[  104.164380] ------------[ cut here ]------------
[  104.166499] WARNING: CPU: 0 PID: 701 at kernel/trace/trace.c:5774
__tracing_resize_ring_buffer+0x100/0x118
[  104.170865] Modules linked in: crct10dif_ce fuse
[  104.173049] CPU: 0 PID: 701 Comm: sh Tainted: G        W
5.8.0-next-20200814 #1
[  104.176715] Hardware name: linux,dummy-virt (DT)
[  104.178864] pstate: 60000005 (nZCv daif -PAN -UAO BTYPE=--)
[  104.181390] pc : __tracing_resize_ring_buffer+0x100/0x118
[  104.183847] lr : __tracing_resize_ring_buffer+0xfc/0x118
[  104.186280] sp : ffff80001433bd00
[  104.187805] x29: ffff80001433bd00 x28: ffff0000e10a49c0
[  104.190252] x27: 0000000000000000 x26: 0000000000000000
[  104.192662] x25: 0000000000000000 x24: 0000000000000000
[  104.195105] x23: 0000000001ccfc00 x22: 0000000001ccfc00
[  104.197534] x21: 00000000fffffff0 x20: ffffffffffffffff
[  104.199984] x19: ffff800012213980 x18: 0000000000000000
[  104.202438] x17: 0000000000000000 x16: 0000000000000000
[  104.204874] x15: 0000000000000000 x14: 0000000000000000
[  104.207379] x13: 0000000000000003 x12: 0000000000000000
[  104.209876] x11: 0000000000000001 x10: ffff80001433bc30
[  104.212289] x9 : ffff800010194980 x8 : ffff0000e10a5480
[  104.214735] x7 : 0000000000000004 x6 : 000000000000000f
[  104.217154] x5 : 0000000000000003 x4 : 0000000000000000
[  104.219588] x3 : ffff0000fac05138 x2 : 0000000000000000
[  104.222036] x1 : ffff0000e10a49c0 x0 : 00000000fffffff0
[  104.224442] Call trace:
[  104.225628]  __tracing_resize_ring_buffer+0x100/0x118
[  104.227908]  tracing_resize_ring_buffer+0x7c/0xb0
[  104.230069]  tracing_entries_write+0x74/0xd0
[  104.232011]  vfs_write+0xf8/0x238
[  104.233542]  ksys_write+0x74/0x100
[  104.235137]  __arm64_sys_write+0x24/0x30
[  104.236935]  el0_svc_common.constprop.0+0x7c/0x198
[  104.239194]  do_el0_svc+0x2c/0x98
[  104.240761]  el0_sync_handler+0x9c/0x1b8
[  104.242611]  el0_sync+0x158/0x180
[  104.244133] ---[ end trace a683c8f878b562c8 ]---

Reported-by: Naresh Kamboju <naresh.kamboju@xxxxxxxxxx>

complete test log,
https://qa-reports.linaro.org/lkft/linux-next-oe/build/next-20200814/testrun/3066187/suite/linux-log-parser/test/check-kernel-bug-1668287/log


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