[linux-next20260529] WARNING: kernel/workqueue.c:5855 at __alloc_workqueue+0x62c/0x690

[Venkat Rao Bagalkote <venkat88@linux.ibm.com>]

Greetings!!!

I am observing following boot warning, appears to be triggered by recent 
WQ changes.

Test environment:
   Kernel: linux-next-20260529 (7.1.0-rc5-next)
   Arch: powerpc (Power11 / pSeries)


Warnings:



[    1.933519] ------------[ cut here ]------------
[    1.933523] workqueue: nvme_tcp_wq is using neither WQ_PERCPU or 
WQ_UNBOUND. Setting WQ_PERCPU.
[    1.933531] WARNING: kernel/workqueue.c:5855 at 
__alloc_workqueue+0x62c/0x690, CPU#19: modprobe/573
[    1.933539] Modules linked in: nvme_tcp(E+) sd_mod(E) nvme_fabrics(E) 
nvme_core(E) ibmvscsi(E) ibmveth(E) scsi_transport_srp(E) dm_mirror(E) 
dm_region_hash(E) dm_log(E) dm_multipath(E) dm_mod(E)
[    1.933553] CPU: 19 UID: 0 PID: 573 Comm: modprobe Tainted: G         
   E       7.1.0-rc5-next-20260529 #1 PREEMPT
[    1.933559] Tainted: [E]=UNSIGNED_MODULE
[    1.933561] Hardware name: IBM,9080-HEX Power11 (architected) 
0x820200 0xf000007 of:IBM,FW1110.01 (NH1110_069) hv:phyp pSeries
[    1.933565] NIP:  c00000000026f59c LR: c00000000026f598 CTR: 
00000000005d54a0
[    1.933568] REGS: c0000000097ff600 TRAP: 0700   Tainted: G       E    
     (7.1.0-rc5-next-20260529)
[    1.933572] MSR:  8000000002029033 <SF,VEC,EE,ME,IR,DR,RI,LE>  CR: 
28222282  XER: 00000004
[    1.933581] CFAR: c000000000234154 IRQMASK: 0
[    1.933581] GPR00: c00000000026f598 c0000000097ff8c0 c00000000205b200 
0000000000000053
[    1.933581] GPR04: 3fffffffffff7fff c0000000097ff6b0 c0000000097ff6a8 
00000013f6440000
[    1.933581] GPR08: 0000000000000027 0000000000000000 c0000000c90b2a00 
c0000000037ae1d0
[    1.933581] GPR12: c000000003b2e160 c0000013fffa2300 0000000000000000 
0000000000000000
[    1.933581] GPR16: 0000000000000000 0000000000000000 0000000000000000 
0000000000000000
[    1.933581] GPR20: 0000000000000000 0000000000000000 0000000000000000 
c000000003fb5d18
[    1.933581] GPR24: c000000003fb55b0 c000000008acc2b8 c008000005390180 
c0000000097ff9c8
[    1.933581] GPR28: 0000000000000000 c000000008acc200 0000000000000000 
0000000000000058
[    1.933619] NIP [c00000000026f59c] __alloc_workqueue+0x62c/0x690
[    1.933623] LR [c00000000026f598] __alloc_workqueue+0x628/0x690
[    1.933627] Call Trace:
[    1.933629] [c0000000097ff8c0] [c00000000026f598] 
__alloc_workqueue+0x628/0x690 (unreliable)
[    1.933635] [c0000000097ff970] [c00000000026f634] 
alloc_workqueue_noprof+0x34/0x50
[    1.933640] [c0000000097ff990] [c008000005316428] 
nvme_tcp_init_module+0x54/0xf4 [nvme_tcp]
[    1.933645] [c0000000097ffa10] [c000000000010f7c] 
do_one_initcall+0x5c/0x45c
[    1.933650] [c0000000097ffb00] [c000000000358b10] 
do_init_module+0x70/0x380
[    1.933655] [c0000000097ffb80] [c00000000035ac10] 
init_module_from_file+0x110/0x130
[    1.933659] [c0000000097ffc60] [c00000000035ad84] 
idempotent_init_module+0x154/0x3c0
[    1.933663] [c0000000097ffd20] [c00000000035b080] 
sys_finit_module+0x90/0x150
[    1.933667] [c0000000097ffda0] [c000000000034318] 
system_call_exception+0x148/0x4b0
[    1.933672] [c0000000097ffe30] [c00000000000d05c] 
system_call_vectored_common+0x15c/0x2ec
[    1.933678] ---- interrupt: 3000 at 0x7fff98bab0bc
[    1.933682] NIP:  00007fff98bab0bc LR: 00007fff98bab0bc CTR: 
0000000000000000
[    1.933685] REGS: c0000000097ffe60 TRAP: 3000   Tainted: G       E    
     (7.1.0-rc5-next-20260529)
[    1.933688] MSR:  800000000000f033 <SF,EE,PR,FP,ME,IR,DR,RI,LE>  CR: 
40222404  XER: 00000000
[    1.933697] IRQMASK: 0
[    1.933697] GPR00: 0000000000000161 00007fffda9c33d0 00007fff98c97c00 
0000000000000005
[    1.933697] GPR04: 00000001034dbf48 0000000000000000 0000000000000000 
0000000000000000
[    1.933697] GPR08: 0000000000000000 0000000000000000 0000000000000000 
0000000000000000
[    1.933697] GPR12: 0000000000000000 00007fff994bcac0 000000013fcd0720 
000000013fcd1c28
[    1.933697] GPR16: 000000013fce06a0 0000000000000208 0000000000000020 
0000000000000000
[    1.933697] GPR20: 0000000000000000 0000000000000000 000000013fcd1bc0 
0000000000000000
[    1.933697] GPR24: 000000013fcd3200 000000013fcd21d0 00000001034dcf18 
000000013fcd1d50
[    1.933697] GPR28: 00000001034dbf48 0000000000060000 000000013fcd1bc0 
000000013fcd2290
[    1.933733] NIP [00007fff98bab0bc] 0x7fff98bab0bc
[    1.933736] LR [00007fff98bab0bc] 0x7fff98bab0bc
[    1.933739] ---- interrupt: 3000
[    1.933741] Code: 4bffff34 3d22ff9c 3b496760 4bfffbfc 3c62ff89 
39200001 3d4201d0 7f24cb78 38638d60 992ab08a 4bfc4ab5 60000000 
<0fe00000> 4bffff60 3c62ff89 39200001
[    1.933753] ---[ end trace 0000000000000000 ]---



If you happen to fix, this please add below tag.


Reported-by: Venkat Rao Bagalkote <venkat88@linux.ibm.com>


Regards,

Venkat.