Re: [PATCH v21 03/20] fgraph: Replace fgraph_ret_regs with ftrace_regs

[Steven Rostedt]

On Tue, 10 Dec 2024 11:09:26 +0900
"Masami Hiramatsu (Google)" <mhiramat@xxxxxxxxxx> wrote:

> From: Masami Hiramatsu (Google) <mhiramat@xxxxxxxxxx>
> 
> Use ftrace_regs instead of fgraph_ret_regs for tracing return value
> on function_graph tracer because of simplifying the callback interface.
> 
> The CONFIG_HAVE_FUNCTION_GRAPH_RETVAL is also replaced by
> CONFIG_HAVE_FUNCTION_GRAPH_FREGS.
> 
> Signed-off-by: Masami Hiramatsu (Google) <mhiramat@xxxxxxxxxx>
> Acked-by: Heiko Carstens <hca@xxxxxxxxxxxxx>

My x86-32 test failed on this patch with:

[    8.387985] Testing tracer preemptoff: PASSED
[    9.603053] Testing tracer preemptirqsoff: PASSED
[   10.820200] Testing tracer wakeup: PASSED
[   12.030489] Testing tracer wakeup_rt: PASSED
[   13.237925] Testing tracer wakeup_dl: PASSED
[   14.440146] Testing tracer function_graph:
[   14.611021] ------------[ cut here ]------------
[   14.614997] WARNING: CPU: 0 PID: 1 at kernel/sched/deadline.c:1519 update_curr_dl_se+0x205/0x270
[   14.614997] Modules linked in:
[   14.614997] CPU: 0 UID: 0 PID: 1 Comm: swapper/0 <89>E<EC><E8>^Q~A<FF>d<8B>5<80><96>wɅ<C0><B8>`<FC>9<C9>^OE<F8><8B><86><94>^D 6.13.0-rc4-test-00003-g50b6e5b87e20-dirty #811
[   14.614997] PSh<E5>^L5<C9><E8><99><FC>^Y<FF><83><C4>^L<EB><C3>.<8D><B4>&
[   14.614997] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[   14.614997] EIP: update_curr_dl_se+0x205/0x270
[   14.614997] Code: 51 10 89 43 34 0f b7 43 48 89 53 38 66 25 40 01 66 83 f8 40 75 04 80 4b 48 81 89 d8 e8 14 5b ff ff 83 f8 01 0f 84 d4 fe ff ff <0f> 0b e9 cd fe ff ff 8d 74 26 00 ba 20 00 00 00 89 d8 e8 c4 ab ff
[   14.614997] EAX: c81eed9c EBX: f6f896e0 ECX: c81eed9c EDX: 00000001
[   14.614997] ESI: f6f89100 EDI: fffffffe EBP: c11cdaac ESP: c11cda94
[   14.614997] DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068 EFLAGS: 00010082
[   14.614997] CR0: 80050033 CR2: ff9ff000 CR3: 0978c000 CR4: 000006f0
[   14.614997] Call Trace:
[   14.614997] irq event stamp: 11132292
[   14.614997] hardirqs last  enabled at (11132291): [<c82fac0c>] trace_graph_entry+0x23c/0x3d0
[   14.614997] hardirqs last disabled at (11132292): [<c8e9f0bc>] sysvec_apic_timer_interrupt+0xc/0x40
[   14.614997] softirqs last  enabled at (11059360): [<c81678ac>] return_to_handler+0x0/0x34
[   14.614997] softirqs last disabled at (11059355): [<c81678ac>] return_to_handler+0x0/0x34
[   14.614997] ---[ end trace 0000000000000000 ]---
[    7.652636] ------------[ cut here ]------------
[    7.652636] DEBUG_LOCKS_WARN_ON(1)
[    7.652636] WARNING: CPU: 0 PID: 1 at kernel/locking/lockdep.c:232 __lock_acquire+0xf42/0x25c0
[    7.652636] Modules linked in:
[    7.652636] CPU: 0 UID: 0 PID: 1 Comm: swapper/0 <89>E<EC><E8>^Q~A<FF>d<8B>5<80><96>wɅ<C0><B8>`<FC>9<C9>^OE<F8><8B><86><94>^D 6.13.0-rc4-test-00003-g50b6e5b87e20-dirty #811
[    7.652636] PSh<E5>^L5<C9><E8><99><FC>^Y<FF><83><C4>^L<EB><C3>.<8D><B4>&
[    7.652636] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[    7.652636] EIP: __lock_acquire+0xf42/0x25c0
[    7.652636] Code: e8 63 ba 57 00 85 c0 0f 84 19 f9 ff ff 8b 0d a8 59 62 c9 85 c9 0f 85 0b f9 ff ff 68 c4 8c 34 c9 68 0b 23 32 c9 e8 be ce f7 ff <0f> 0b 58 31 c0 5a e9 61 f2 ff ff 8d 76 00 b9 05 00 00 00 64 a1 80
[    7.652636] EAX: c820bf72 EBX: 00000000 ECX: c820bf72 EDX: 00000001
[    7.652636] ESI: 00000000 EDI: c11a2e38 EBP: c1143e7c ESP: c1143de4
[    7.652636] DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068 EFLAGS: 00010086
[    7.652636] CR0: 80050033 CR2: ff9ff000 CR3: 0978c000 CR4: 000006f0
[    7.652636] Call Trace:
[    7.652636] WARNING: stack recursion on stack type 3
[    7.652636] irq event stamp: 11215629
[    7.652636] hardirqs last  enabled at (11215628): [<c81917c9>] handle_softirqs+0x99/0x3b0
[    7.652636] hardirqs last disabled at (11215629): [<c8eaf5cd>] _raw_spin_lock_irq+0x4d/0x50
[    7.652636] softirqs last  enabled at (11059360): [<c81678ac>] return_to_handler+0x0/0x34
[    7.652636] softirqs last disabled at (11215627): [<c81678ac>] return_to_handler+0x0/0x34
[    7.652636] ---[ end trace 0000000000000000 ]---
[    7.652636] ------------[ cut here ]------------
[    7.652636] kernel BUG at arch/x86/mm/extable.c:373!
[    7.652636] ------------[ cut here ]------------
[    7.652636] kernel BUG at arch/x86/mm/extable.c:373!
[    7.652636] ------------[ cut here ]------------
[    7.652636] kernel BUG at arch/x86/mm/extable.c:373!
[    7.652636] ------------[ cut here ]------------
[    7.652636] kernel BUG at arch/x86/mm/extable.c:373!
[    7.652636] ------------[ cut here ]------------
[    7.652636] kernel BUG at arch/x86/mm/extable.c:373!
[    7.652636] ------------[ cut here ]------------
[    7.652636] kernel BUG at arch/x86/mm/extable.c:373!
[    7.652636] ------------[ cut here ]------------
[...]

Config attached.

-- Steve

Attachment: config
Description: Binary data