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Message-ID: <202503261331.d388f82a-lkp@intel.com>
Date: Wed, 26 Mar 2025 14:33:27 +0800
From: kernel test robot <oliver.sang@...el.com>
To: Herbert Xu <herbert@...dor.apana.org.au>
CC: <oe-lkp@...ts.linux.dev>, <lkp@...el.com>, <linux-kernel@...r.kernel.org>,
	Guangwu Zhang <guazhang@...hat.com>, <linux-crypto@...r.kernel.org>,
	<oliver.sang@...el.com>
Subject: [linus:master] [hwrng]  fb10c7a846:
 WARNING:at_drivers/char/hw_random/core.c:#hwrng_fillfn


hi, Herbert Xu,

we noticed the WARN added in this commit was hit in our tests.
below full report FYI.


Hello,

kernel test robot noticed "WARNING:at_drivers/char/hw_random/core.c:#hwrng_fillfn" on:

commit: fb10c7a84661471cdcc8998d63703211b873c126 ("hwrng: core - Add WARN_ON for buggy read return values")
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master

in testcase: stress-ng
version: stress-ng-x86_64-1c71921fd-1_20250212
with following parameters:

	nr_threads: 100%
	testtime: 60s
	test: memcpy
	cpufreq_governor: performance



config: x86_64-rhel-9.4
compiler: gcc-12
test machine: 64 threads 2 sockets Intel(R) Xeon(R) Gold 6346 CPU @ 3.10GHz (Ice Lake) with 256G memory

(please refer to attached dmesg/kmsg for entire log/backtrace)



If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <oliver.sang@...el.com>
| Closes: https://lore.kernel.org/oe-lkp/202503261331.d388f82a-lkp@intel.com


kern  :warn  : [   28.777572] ------------[ cut here ]------------
kern  :info  : [   28.780433] resctrl: MB allocation detected
kern :warn : [   28.785745] WARNING: CPU: 46 PID: 576 at drivers/char/hw_random/core.c:188 hwrng_fillfn (drivers/char/hw_random/core.c:188 drivers/char/hw_random/core.c:492) 
kern  :info  : [   28.790623] resctrl: L3 monitoring detected
kern  :info  : [   28.790753] IPI shorthand broadcast: enabled
kern  :warn  : [   28.800354] Modules linked in:
kern  :info  : [   28.805292] ... APIC ID:      00000000 (0)

kern  :info  : [   28.806287] ... APIC VERSION: 01060015

kern  :warn  : [   28.818747] CPU: 46 UID: 0 PID: 576 Comm: hwrng Not tainted 6.12.0-rc1-00031-gfb10c7a84661 #1
kern  :warn  : [   28.806287] 0000000000000000
kern  :warn  : [   28.825377] Hardware name: Inspur NF5180M6/NF5180M6, BIOS 06.00.04 04/12/2022
kern  :warn  : [   28.806287] 0000000000000000000000000000000000000000
kern :warn : [   28.836782] RIP: 0010:hwrng_fillfn (drivers/char/hw_random/core.c:188 drivers/char/hw_random/core.c:492) 
kern  :warn  : [   28.806287] 00000000
kern  :debug : [   28.806287] 00000000000000000000000000000000
kern :warn : [ 28.848190] Code: 11 27 00 00 e8 45 a7 6f 00 48 89 df e8 fd f4 ff ff e9 8c fe ff ff 48 8b 43 20 48 89 ee 48 89 df ff d0 0f 1f 00 e9 15 ff ff ff <0f> 0b 44 0f b7 2d ea d6 70 02 66 44 39 6b 38 74 23 66 44 89 6b 38
All code
========
   0:	11 27                	adc    %esp,(%rdi)
   2:	00 00                	add    %al,(%rax)
   4:	e8 45 a7 6f 00       	call   0x6fa74e
   9:	48 89 df             	mov    %rbx,%rdi
   c:	e8 fd f4 ff ff       	call   0xfffffffffffff50e
  11:	e9 8c fe ff ff       	jmp    0xfffffffffffffea2
  16:	48 8b 43 20          	mov    0x20(%rbx),%rax
  1a:	48 89 ee             	mov    %rbp,%rsi
  1d:	48 89 df             	mov    %rbx,%rdi
  20:	ff d0                	call   *%rax
  22:	0f 1f 00             	nopl   (%rax)
  25:	e9 15 ff ff ff       	jmp    0xffffffffffffff3f
  2a:*	0f 0b                	ud2		<-- trapping instruction
  2c:	44 0f b7 2d ea d6 70 	movzwl 0x270d6ea(%rip),%r13d        # 0x270d71e
  33:	02 
  34:	66 44 39 6b 38       	cmp    %r13w,0x38(%rbx)
  39:	74 23                	je     0x5e
  3b:	66 44 89 6b 38       	mov    %r13w,0x38(%rbx)

Code starting with the faulting instruction
===========================================
   0:	0f 0b                	ud2
   2:	44 0f b7 2d ea d6 70 	movzwl 0x270d6ea(%rip),%r13d        # 0x270d6f4
   9:	02 
   a:	66 44 39 6b 38       	cmp    %r13w,0x38(%rbx)
   f:	74 23                	je     0x34
  11:	66 44 89 6b 38       	mov    %r13w,0x38(%rbx)
kern  :warn  : [   28.850350] 00000000000000000000000000000000
kern  :debug : [   28.850350] 0000000000000000
kern  :warn  : [   28.858987] RSP: 0000:ffa000000ecb7ed0 EFLAGS: 00010206
kern  :warn  : [   28.850350] 000000000000000000000000000000000000000008001000



kern  :debug : [   28.886279] number of MP IRQ sources: 15.
kern  :warn  : [   28.891243] RAX: 0000000000000903 RBX: ff110001077f6760 RCX: ffa000000ecb7e57
kern  :debug : [   28.894823] number of IO-APIC #8 registers: 120.
kern  :warn  : [   28.900743] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ff110001077f6038
kern  :info  : [   28.907093] testing the IO APIC.......................
kern  :debug : [   28.907113] IO APIC #8......
kern  :warn  : [   28.909286] RBP: ff11000109247c40 R08: 0000000000000000 R09: 0000000000000000
kern  :debug : [   28.911481] .... register #00: 0E000000
kern  :warn  : [   28.913673] R10: 00000000000007e0 R11: ff110020001340e4 R12: 0000000000000000
kern  :debug : [   28.918379] .......    : physical APIC id: 0E
kern  :warn  : [   28.926205] R13: ff11000200313a00 R14: 0000000000000000 R15: ffffffff819ce3d0
kern  :debug : [   28.931517] .......    : Delivery Type: 0
kern  :warn  : [   28.939345] FS:  0000000000000000(0000) GS:ff11002000100000(0000) knlGS:0000000000000000
kern  :debug : [   28.945175] .......    : LTS          : 0
kern  :warn  : [   28.948756] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
kern  :debug : [   28.956581] .... register #01: 00770020
kern  :warn  : [   28.961118] CR2: 0000000000000000 CR3: 000000407dc22001 CR4: 0000000000771ef0
kern  :debug : [   28.968939] .......     : max redirection entries: 77
kern  :debug : [   28.968940] .......     : PRQ implemented: 0
kern  :warn  : [   28.973996] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
kern  :debug : [   28.981818] .......     : IO APIC version: 20
kern  :warn  : [   28.986525] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
kern  :debug : [   28.995304] .... register #02: 00000000
kern  :warn  : [   29.000012] PKRU: 55555554
kern  :debug : [   29.006450] .......     : arbitration: 00
kern  :warn  : [   29.010984] Call Trace:
kern  :debug : [   29.018809] .... IRQ redirection table:
kern  :debug : [   29.018810] IOAPIC 0:
kern  :debug : [   29.018819]  pin00, disabled, edge , high, V(00), IRR(0), S(0), physic	al, D(0000), M(0)
kern  :warn  : [   29.024563]  <TASK>
kern  :debug : [   29.029528]  pin01, disabled, edge , high, V(00), IRR(0), S(0), physic	al, D(0000), M(0)
kern :warn : [   29.037352] ? __warn (kernel/panic.c:748) 
kern  :debug : [   29.042408]  pin02, enabled , edge , high, V(30), IRR(0), S(0), physic	al, D(0000), M(0)
kern :warn : [   29.050225] ? hwrng_fillfn (drivers/char/hw_random/core.c:188 drivers/char/hw_random/core.c:492) 
kern  :debug : [   29.054766]  pin03, disabled, edge , high, V(00), IRR(0), S(0), physic	al, D(0000), M(0)
kern :warn : [   29.058165] ? report_bug (lib/bug.c:180 lib/bug.c:219) 
kern  :debug : [   29.062876]  pin04, disabled, edge , high, V(00), IRR(0), S(0), physic	al, D(0000), M(0)
kern :warn : [   29.066017] ? handle_bug (arch/x86/kernel/traps.c:285) 
kern  :debug : [   29.070556]  pin05, disabled, edge , high, V(00), IRR(0), S(0), physic	al, D(0000), M(0)
kern :warn : [   29.073520] ? exc_invalid_op (arch/x86/kernel/traps.c:309 (discriminator 1)) 
kern  :debug : [   29.082309]  pin06, disabled, edge , high, V(00), IRR(0), S(0), physic	al, D(0000), M(0)
kern :warn : [   29.085099] ? asm_exc_invalid_op (arch/x86/include/asm/idtentry.h:621) 
kern  :debug : [   29.093888]  pin07, disabled, edge , high, V(00), IRR(0), S(0), physic	al, D(0000), M(0)
kern :warn : [   29.097807] ? __pfx_hwrng_fillfn (drivers/char/hw_random/core.c:480) 
kern  :debug : [   29.106593]  pin08, enabled , edge , high, V(20), IRR(0), S(0), physic	al, D(0003), M(0)
kern :warn : [   29.111118] ? hwrng_fillfn (drivers/char/hw_random/core.c:188 drivers/char/hw_random/core.c:492) 
kern  :debug : [   29.119906]  pin09, enabled , level, high, V(20), IRR(0), S(0), physic	al, D(0002), M(0)
kern :warn : [   29.124255] kthread (kernel/kthread.c:389) 
kern  :debug : [   29.133043]  pin0a, disabled, edge , high, V(00), IRR(0), S(0), physic	al, D(0000), M(0)
kern :warn : [   29.137223] ? __pfx_kthread (kernel/kthread.c:342) 
kern  :debug : [   29.146009]  pin0b, disabled, edge , high, V(00), IRR(0), S(0), physic	al, D(0000), M(0)
kern :warn : [   29.150534] ret_from_fork (arch/x86/kernel/process.c:147) 
kern  :debug : [   29.159320]  pin0c, disabled, edge , high, V(00), IRR(0), S(0), physic	al, D(0000), M(0)
kern :warn : [   29.164193] ? __pfx_kthread (kernel/kthread.c:342) 
kern  :debug : [   29.172979]  pin0d, disabled, edge , high, V(00), IRR(0), S(0), physic	al, D(0000), M(0)
kern :warn : [   29.177851] ret_from_fork_asm (arch/x86/entry/entry_64.S:257) 
kern  :debug : [   29.186640]  pin0e, disabled, edge , high, V(00), IRR(0), S(0), physic	al, D(0000), M(0)
kern  :warn  : [   29.191166]  </TASK>
kern  :debug : [   29.199952]  pin0f, disabled, edge , high, V(00), IRR(0), S(0), physic	al, D(0000), M(0)
kern  :warn  : [   29.203697] ---[ end trace 0000000000000000 ]---


The kernel config and materials to reproduce are available at:
https://download.01.org/0day-ci/archive/20250326/202503261331.d388f82a-lkp@intel.com



-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki


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