linux-kernel - Re: [next-20251022] Kernel Boot Warnings at arch/powerpc/kernel/trace/ftrace.c:234

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Message-ID: <d718ee80-d97e-4f0f-b1f2-692626a19b1d@linux.ibm.com>
Date: Wed, 22 Oct 2025 13:56:04 +0530
From: Venkat Rao Bagalkote <venkat88@...ux.ibm.com>
To: LKML <linux-kernel@...r.kernel.org>,
        linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        Madhavan Srinivasan <maddy@...ux.ibm.com>,
        Hari Bathini <hbathini@...ux.ibm.com>, joe.lawrence@...hat.com,
        Naveen N Rao <naveen@...nel.org>
Subject: Re: [next-20251022] Kernel Boot Warnings at
 arch/powerpc/kernel/trace/ftrace.c:234


On 22/10/25 1:52 pm, Venkat Rao Bagalkote wrote:
> Greetings!!!
>
>
> IBM CI has reported kernel boot warnings with next-20251022 kernel. I 
> see there are couple of warnings hit and eventually system boots to 
> emergency mode.
>
>
> Traces:
>
>
> [    0.000000] stackdepot: allocating space for 8191 stack pools via 
> memblock
> [    0.000000] SLUB: HWalign=128, Order=0-3, MinObjects=0, CPUs=48, 
> Nodes=32
> [    0.000000] ------------[ cut here ]------------
> [    0.000000] WARNING: arch/powerpc/kernel/trace/ftrace.c:234 at 
> ftrace_init_ool_stub+0x188/0x3f4, CPU#0: swapper/0
> [    0.000000] Modules linked in:
> [    0.000000] CPU: 0 UID: 0 PID: 0 Comm: swapper Not tainted 
> 6.18.0-rc2-next-20251022+ #1 VOLUNTARY
> [    0.000000] Hardware name: IBM,9080-HEX Power11 (architected) 
> 0x820200 0xf000007 of:IBM,FW1110.01 (NH1110_069) hv:phyp pSeries
> [    0.000000] NIP:  c000000000092430 LR: c000000000092414 CTR: 
> 0000000000000000
> [    0.000000] REGS: c000000004ba7a70 TRAP: 0700   Not tainted 
> (6.18.0-rc2-next-20251022+)
> [    0.000000] MSR:  8000000002021033 <SF,VEC,ME,IR,DR,RI,LE>  CR: 
> 44022224  XER: 00000001
> [    0.000000] CFAR: c0000000008d7114 IRQMASK: 3
> [    0.000000] GPR00: c000000000508de0 c000000004ba7d10 
> c00000000248a400 c000000004ce9720
> [    0.000000] GPR04: c000000007335df8 00000000000000c0 
> c000000000092414 0000000000000000
> [    0.000000] GPR08: 0000000000000003 0000000000000001 
> 0000000000000000 0000000000002000
> [    0.000000] GPR12: c00e0000008ce3a6 c0000000050b0000 
> 0000000000000003 0000000000000001
> [    0.000000] GPR16: c000000007335df8 0000000000000000 
> c0000000045a8ac0 c000000004c2d450
> [    0.000000] GPR20: c0000000070e0108 c0000000070e0110 
> 0000000000000013 000000000000c869
> [    0.000000] GPR24: c000000004ce9720 000000000000393f 
> c000000007335e08 c000000001879a78
> [    0.000000] GPR28: c000000001a10230 0000000000003940 
> 0000000000000000 c000000007335df8
> [    0.000000] NIP [c000000000092430] ftrace_init_ool_stub+0x188/0x3f4
> [    0.000000] LR [c000000000092414] ftrace_init_ool_stub+0x16c/0x3f4
> [    0.000000] Call Trace:
> [    0.000000] [c000000004ba7d10] [c0000000000925c0] 
> ftrace_init_ool_stub+0x318/0x3f4 (unreliable)
> [    0.000000] [c000000004ba7de0] [c000000000508de0] 
> ftrace_process_locs+0x364/0x8e0
> [    0.000000] [c000000004ba7ee0] [c000000003060908] 
> ftrace_init+0x68/0x1c8
> [    0.000000] [c000000004ba7f50] [c00000000300ee6c] 
> start_kernel+0x1e4/0x4fc
> [    0.000000] [c000000004ba7fe0] [c00000000000e9a0] 
> start_here_common+0x1c/0x20
> [    0.000000] Code: 1d290018 7f9c4a14 3bbd0001 7f03c378 48844ca5 
> 60000000 39400000 7f9dc800 39200001 7c1dc800 93b80000 7d29575e 
> <0b090000> 4181005c 7fe3fb78 3b3c0008
> [    0.000000] ---[ end trace 0000000000000000 ]---
> [    0.000000] ------------[ ftrace bug ]------------
> [    0.000000] ftrace failed to modify
> [    0.000000] [<c000000001879a78>] ip6mr_vif_seq_stop+0x0/0x8
> [    0.000000]  actual:   00:00:00:60
> [    0.000000] Initializing ftrace call sites
> [    0.000000] ftrace record flags: 0
> [    0.000000]  (0)
> [    0.000000]  expected tramp: c000000000093490
> [    0.000000] ------------[ cut here ]------------
> [    0.000000] WARNING: kernel/trace/ftrace.c:2209 at 
> ftrace_bug+0x168/0x49c, CPU#0: swapper/0
> [    0.000000] Modules linked in:
> [    0.000000] CPU: 0 UID: 0 PID: 0 Comm: swapper Tainted: G   W       
>    6.18.0-rc2-next-20251022+ #1 VOLUNTARY
> [    0.000000] Tainted: [W]=WARN
> [    0.000000] Hardware name: IBM,9080-HEX Power11 (architected) 
> 0x820200 0xf000007 of:IBM,FW1110.01 (NH1110_069) hv:phyp pSeries
> [    0.000000] NIP:  c000000000508748 LR: c000000000508744 CTR: 
> 0000000000000000
> [    0.000000] REGS: c000000004ba7a90 TRAP: 0700   Tainted: G   W     
>       (6.18.0-rc2-next-20251022+)
> [    0.000000] MSR:  8000000002021033 <SF,VEC,ME,IR,DR,RI,LE>  CR: 
> 28028220  XER: 00000001
> [    0.000000] CFAR: c0000000003880f8 IRQMASK: 3
> [    0.000000] GPR00: c000000000508744 c000000004ba7d30 
> c00000000248a400 0000000000000022
> [    0.000000] GPR04: 0000000000000004 0000000000000000 
> c00000000027abec 0000000000000001
> [    0.000000] GPR08: 0000000000000001 0000000000000000 
> 0000000000000000 a80e000000000000
> [    0.000000] GPR12: c00e00000081c5d8 c0000000050b0000 
> 0000000000000003 0000000000000001
> [    0.000000] GPR16: c000000007335df8 0000000000000000 
> c0000000045a8ac0 c000000004c2d450
> [    0.000000] GPR20: c0000000070e0108 c0000000070e0110 
> 0000000000000013 000000000000c869
> [    0.000000] GPR24: 0000000000000000 0000000000000000 
> 000000000000b93f 0000000000000000
> [    0.000000] GPR28: c000000001879a78 c000000001b93d20 
> c000000007335df8 c000000007335e00
> [    0.000000] NIP [c000000000508748] ftrace_bug+0x168/0x49c
> [    0.000000] LR [c000000000508744] ftrace_bug+0x164/0x49c
> [    0.000000] Call Trace:
> [    0.000000] [c000000004ba7d30] [c000000000508744] 
> ftrace_bug+0x164/0x49c (unreliable)
> [    0.000000] [c000000004ba7de0] [c000000000508dfc] 
> ftrace_process_locs+0x380/0x8e0
> [    0.000000] [c000000004ba7ee0] [c000000003060908] 
> ftrace_init+0x68/0x1c8
> [    0.000000] [c000000004ba7f50] [c00000000300ee6c] 
> start_kernel+0x1e4/0x4fc
> [    0.000000] [c000000004ba7fe0] [c00000000000e9a0] 
> start_here_common+0x1c/0x20
> [    0.000000] Code: 7fe3fb78 483cea79 60000000 e93e0008 75290800 
> 40820164 7fc3f378 4bfffa19 7c641b78 387d0fe0 4be7f975 60000000 
> <0fe00000> 39000001 3ce2027a 3d22fdc1
> [    0.000000] ---[ end trace 0000000000000000 ]---
> [    0.000000] ftrace: allocating 51305 entries in 19 pages

Pasting the traces in more legible form.


[    0.000000] mem auto-init: stack:all(zero), heap alloc:off, heap free:off
[    0.000000] stackdepot: allocating hash table via alloc_large_system_hash
[    0.000000] stackdepot hash table entries: 1048576 (order: 8, 
16777216 bytes, linear)
[    0.000000] stackdepot: allocating space for 8191 stack pools via 
memblock
[    0.000000] SLUB: HWalign=128, Order=0-3, MinObjects=0, CPUs=48, Nodes=32
[    0.000000] ------------[ cut here ]------------
[    0.000000] WARNING: arch/powerpc/kernel/trace/ftrace.c:234 at 
ftrace_init_ool_stub+0x188/0x3f4, CPU#0: swapper/0
[    0.000000] Modules linked in:
[    0.000000] CPU: 0 UID: 0 PID: 0 Comm: swapper Not tainted 
6.18.0-rc2-next-20251022+ #1 VOLUNTARY
[    0.000000] Hardware name: IBM,9080-HEX Power11 (architected) 
0x820200 0xf000007 of:IBM,FW1110.01 (NH1110_069) hv:phyp pSeries
[    0.000000] NIP:  c000000000092430 LR: c000000000092414 CTR: 
0000000000000000
[    0.000000] REGS: c000000004ba7a70 TRAP: 0700   Not tainted 
(6.18.0-rc2-next-20251022+)
[    0.000000] MSR:  8000000002021033 <SF,VEC,ME,IR,DR,RI,LE>  CR: 
44022224  XER: 00000001
[    0.000000] CFAR: c0000000008d7114 IRQMASK: 3
[    0.000000] GPR00: c000000000508de0 c000000004ba7d10 c00000000248a400 
c000000004ce9720
[    0.000000] GPR04: c000000007335df8 00000000000000c0 c000000000092414 
0000000000000000
[    0.000000] GPR08: 0000000000000003 0000000000000001 0000000000000000 
0000000000002000
[    0.000000] GPR12: c00e0000008ce3a6 c0000000050b0000 0000000000000003 
0000000000000001
[    0.000000] GPR16: c000000007335df8 0000000000000000 c0000000045a8ac0 
c000000004c2d450
[    0.000000] GPR20: c0000000070e0108 c0000000070e0110 0000000000000013 
000000000000c869
[    0.000000] GPR24: c000000004ce9720 000000000000393f c000000007335e08 
c000000001879a78
[    0.000000] GPR28: c000000001a10230 0000000000003940 0000000000000000 
c000000007335df8
[    0.000000] NIP [c000000000092430] ftrace_init_ool_stub+0x188/0x3f4
[    0.000000] LR [c000000000092414] ftrace_init_ool_stub+0x16c/0x3f4
[    0.000000] Call Trace:
[    0.000000] [c000000004ba7d10] [c0000000000925c0] 
ftrace_init_ool_stub+0x318/0x3f4 (unreliable)
[    0.000000] [c000000004ba7de0] [c000000000508de0] 
ftrace_process_locs+0x364/0x8e0
[    0.000000] [c000000004ba7ee0] [c000000003060908] ftrace_init+0x68/0x1c8
[    0.000000] [c000000004ba7f50] [c00000000300ee6c] 
start_kernel+0x1e4/0x4fc
[    0.000000] [c000000004ba7fe0] [c00000000000e9a0] 
start_here_common+0x1c/0x20
[    0.000000] Code: 1d290018 7f9c4a14 3bbd0001 7f03c378 48844ca5 
60000000 39400000 7f9dc800 39200001 7c1dc800 93b80000 7d29575e 
<0b090000> 4181005c 7fe3fb78 3b3c0008
[    0.000000] ---[ end trace 0000000000000000 ]---
[    0.000000] ------------[ ftrace bug ]------------
[    0.000000] ftrace failed to modify
[    0.000000] [<c000000001879a78>] ip6mr_vif_seq_stop+0x0/0x8
[    0.000000]  actual:   00:00:00:60
[    0.000000] Initializing ftrace call sites
[    0.000000] ftrace record flags: 0
[    0.000000]  (0)
[    0.000000]  expected tramp: c000000000093490
[    0.000000] ------------[ cut here ]------------
[    0.000000] WARNING: kernel/trace/ftrace.c:2209 at 
ftrace_bug+0x168/0x49c, CPU#0: swapper/0
[    0.000000] Modules linked in:
[    0.000000] CPU: 0 UID: 0 PID: 0 Comm: swapper Tainted: G   W        
    6.18.0-rc2-next-20251022+ #1 VOLUNTARY
[    0.000000] Tainted: [W]=WARN
[    0.000000] Hardware name: IBM,9080-HEX Power11 (architected) 
0x820200 0xf000007 of:IBM,FW1110.01 (NH1110_069) hv:phyp pSeries
[    0.000000] NIP:  c000000000508748 LR: c000000000508744 CTR: 
0000000000000000
[    0.000000] REGS: c000000004ba7a90 TRAP: 0700   Tainted: G   W        
     (6.18.0-rc2-next-20251022+)
[    0.000000] MSR:  8000000002021033 <SF,VEC,ME,IR,DR,RI,LE>  CR: 
28028220  XER: 00000001
[    0.000000] CFAR: c0000000003880f8 IRQMASK: 3
[    0.000000] GPR00: c000000000508744 c000000004ba7d30 c00000000248a400 
0000000000000022
[    0.000000] GPR04: 0000000000000004 0000000000000000 c00000000027abec 
0000000000000001
[    0.000000] GPR08: 0000000000000001 0000000000000000 0000000000000000 
a80e000000000000
[    0.000000] GPR12: c00e00000081c5d8 c0000000050b0000 0000000000000003 
0000000000000001
[    0.000000] GPR16: c000000007335df8 0000000000000000 c0000000045a8ac0 
c000000004c2d450
[    0.000000] GPR20: c0000000070e0108 c0000000070e0110 0000000000000013 
000000000000c869
[    0.000000] GPR24: 0000000000000000 0000000000000000 000000000000b93f 
0000000000000000
[    0.000000] GPR28: c000000001879a78 c000000001b93d20 c000000007335df8 
c000000007335e00
[    0.000000] NIP [c000000000508748] ftrace_bug+0x168/0x49c
[    0.000000] LR [c000000000508744] ftrace_bug+0x164/0x49c
[    0.000000] Call Trace:
[    0.000000] [c000000004ba7d30] [c000000000508744] 
ftrace_bug+0x164/0x49c (unreliable)
[    0.000000] [c000000004ba7de0] [c000000000508dfc] 
ftrace_process_locs+0x380/0x8e0
[    0.000000] [c000000004ba7ee0] [c000000003060908] ftrace_init+0x68/0x1c8
[    0.000000] [c000000004ba7f50] [c00000000300ee6c] 
start_kernel+0x1e4/0x4fc
[    0.000000] [c000000004ba7fe0] [c00000000000e9a0] 
start_here_common+0x1c/0x20
[    0.000000] Code: 7fe3fb78 483cea79 60000000 e93e0008 75290800 
40820164 7fc3f378 4bfffa19 7c641b78 387d0fe0 4be7f975 60000000 
<0fe00000> 39000001 3ce2027a 3d22fdc1
[    0.000000] ---[ end trace 0000000000000000 ]---
[    0.000000] ftrace: allocating 51305 entries in 19 pages
[    0.000000] ftrace: allocated 19 pages with 3 groups
[    0.000000] rcu: Hierarchical RCU implementation.
[    0.000000] rcu:     RCU event tracing is enabled.

>
>
>
> Attached is the config file.
>
>
> If you happen to fix this, please add below tag.
>
>
> Reported-by: Venkat Rao Bagalkote <venkat88@...ux.ibm.com>
>
>
> Regards,
>
> Venkat.
>