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Date: Tue, 15 Apr 2025 13:40:28 -0400
From: Steven Rostedt <rostedt@goodmis.org>
To: Mark Brown <broonie@kernel.org>
Cc: linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org,
 bpf@vger.kernel.org, Masami Hiramatsu <mhiramat@kernel.org>, Mark Rutland
 <mark.rutland@arm.com>, Mathieu Desnoyers <mathieu.desnoyers@efficios.com>,
 Andrew Morton <akpm@linux-foundation.org>, Sven Schnelle
 <svens@linux.ibm.com>, Paul Walmsley <paul.walmsley@sifive.com>, Palmer
 Dabbelt <palmer@dabbelt.com>, Albert Ou <aou@eecs.berkeley.edu>, Guo Ren
 <guoren@kernel.org>, Donglin Peng <dolinux.peng@gmail.com>, Zheng Yejian
 <zhengyejian@huaweicloud.com>, Aishwarya.TCV@arm.com
Subject: Re: [PATCH v4 2/4] ftrace: Add support for function argument to
 graph tracer
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On Fri, 11 Apr 2025 18:39:05 +0100
Mark Brown <broonie@kernel.org> wrote:

> The tail end of the log there is:
> 
> # # + TEST_STRING=p vfs_read 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127
> # # + TEST_STRING=p vfs_read 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128
> # # + echo p vfs_read 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128
> # # ./ftracetest: 16: echo: echo: I/O error
> 
> which smells a bit of a shell incompatibility issue.  I'll try to find
> time to have a look.

Mark, can you test this patch to see if it fixes this?:

(I need to update the "Closes:" tag to be this email and not the top of the thread)

  https://lore.kernel.org/all/20250414210900.4de5e8b9@gandalf.local.home/

-- Steve