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
