Re: [RFC: DMA_PMD 02/22] iommu/dma: add DMA_PMD pool lifecycle and page recycle hook

[kernel test robot]

Hello,

kernel test robot noticed "WARNING:at_kernel/workqueue.c:#alloc_workqueue_va" on:

commit: 3311715530328ddf9249e312fa817c89b767fde9 ("[RFC: DMA_PMD 02/22] iommu/dma: add DMA_PMD pool lifecycle and page recycle hook")
url: https://github.com/intel-lab-lkp/linux/commits/Luigi-Rizzo/iommu-dma-introduce-CONFIG_DMA_PMD-and-metadata-table/20261003-212220
base: https://git.kernel.org/cgit/linux/kernel/git/akpm/mm.git mm-everything patch link: https://lore.kernel.org/all/20261003212241.3432303-3-lrizzo@xxxxxxxxxx/
patch subject: [RFC: DMA_PMD 02/22] iommu/dma: add DMA_PMD pool lifecycle and page recycle hook

in testcase: boot

config: x86_64-rhel-9.4-rust
compiler: clang-22
test machine: qemu-system-x86_64 -enable-kvm -cpu SandyBridge -smp 4 -m 16G

(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 <yi1.lai@xxxxxxxxx>
| Closes: https://lore.kernel.org/oe-lkp/202610101013.706708d0-lkp@xxxxxxxxx


[    0.966875][    T1] ------------[ cut here ]------------
[    0.972831][    T1] workqueue: dma_pmd is using neither WQ_PERCPU or WQ_UNBOUND. Setting WQ_PERCPU.
[    0.978823][    T1] WARNING: kernel/workqueue.c:5939 at alloc_workqueue_va+0x75a/0x7c0, CPU#3: swapper/0/1
[    0.983827][    T1] Modules linked in:
[    0.985221][    T1] CPU: 3 UID: 0 PID: 1 Comm: swapper/0 Not tainted 7.3.0-rc5+ #1 PREEMPT(lazy)
[    0.988734][    T1] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[    0.991819][    T1] RIP: 0010:alloc_workqueue_va (workqueue.c:5938)
[    0.993522][    T1] Code: 00 08 00 00 e8 40 08 f0 ff e9 cb f9 ff ff 0f 0b e9 cd fe ff ff 0f 0b e9 c6 fe ff ff 48 8d 3d 66 07 18 02 49 8d b6 b8 00 00 00 <67> 48 0f b9 3a 41 81 cc 00 01 00 00 e9 75 f9 ff ff 48 8d 3d 57 07
All code
========
   0:	00 08                	add    %cl,(%rax)
   2:	00 00                	add    %al,(%rax)
   4:	e8 40 08 f0 ff       	call   0xfffffffffff00849
   9:	e9 cb f9 ff ff       	jmp    0xfffffffffffff9d9
   e:	0f 0b                	ud2
  10:	e9 cd fe ff ff       	jmp    0xfffffffffffffee2
  15:	0f 0b                	ud2
  17:	e9 c6 fe ff ff       	jmp    0xfffffffffffffee2
  1c:	48 8d 3d 66 07 18 02 	lea    0x2180766(%rip),%rdi        # 0x2180789
  23:	49 8d b6 b8 00 00 00 	lea    0xb8(%r14),%rsi
  2a:*	67 48 0f b9 3a       	ud1    (%edx),%rdi		<-- trapping instruction
  2f:	41 81 cc 00 01 00 00 	or     $0x100,%r12d
  36:	e9 75 f9 ff ff       	jmp    0xfffffffffffff9b0
  3b:	48                   	rex.W
  3c:	8d                   	.byte 0x8d
  3d:	3d                   	.byte 0x3d
  3e:	57                   	push   %rdi
  3f:	07                   	(bad)

Code starting with the faulting instruction ===========================================
   0:	67 48 0f b9 3a       	ud1    (%edx),%rdi
   5:	41 81 cc 00 01 00 00 	or     $0x100,%r12d
   c:	e9 75 f9 ff ff       	jmp    0xfffffffffffff986
  11:	48                   	rex.W
  12:	8d                   	.byte 0x8d
  13:	3d                   	.byte 0x3d
  14:	57                   	push   %rdi
  15:	07                   	(bad)
[    0.999820][    T1] RSP: 0000:ffffcb9d00013a90 EFLAGS: 00010246
[    1.001542][    T1] RAX: 0000000000000000 RBX: ffff8b7380b46400 RCX: 33ebeeb162fc7d00
[    1.004550][    T1] RDX: 0000000000000007 RSI: ffff8b7380b464b8 RDI: ffffffff8e484980
[    1.006818][    T1] RBP: 0000000000000000 R08: 00000000646d705f R09: 000000000000000f
[    1.008790][    T1] R10: ffff8b7381cec680 R11: ffffffff8ea6ca80 R12: 0000000000000008
[    1.011630][    T1] R13: ffffffff8da42c29 R14: ffff8b7380b46400 R15: ffffcb9d00013b10
[    1.013818][    T1] FS:  0000000000000000(0000) GS:ffff8b7721089000(0000) knlGS:0000000000000000
[    1.016639][    T1] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    1.018818][    T1] CR2: 0000000000000000 CR3: 00000003e4e20000 CR4: 00000000000406f0
[    1.021819][    T1] Call Trace:
[    1.022829][    T1]  <TASK>
[    1.023829][    T1]  ? iommu_dma_forcedac_setup (dma-iommu.c:?)
[    1.025515][    T1]  alloc_workqueue_noprof (workqueue.c:6049)
[    1.026818][    T1]  ? blake2s_update (crypto/blake2s.c:131)
[    1.028234][    T1]  ? intel_cleanup_irq_remapping (irq_remapping.c:?)
[    1.029818][    T1]  dma_pmd_init (iommu/dma-pmd-pool.c:373)
[    1.031195][    T1]  do_one_initcall (main.c:1358)
[    1.032833][    T1]  ? get_random_u32 (char/random.c:396 char/random.c:541)
[    1.033826][    T1]  ? __get_random_u32_below (char/random.c:555)
[    1.036270][    T1]  ? alloc_from_new_slab (linux/spinlock.h:425 slub.c:4519)
[    1.037829][    T1]  ? refill_objects (slub.c:7424)
[    1.038818][    T1]  ? irqentry_exit (linux/irq-entry-common.h:539)
[    1.040264][    T1]  ? asm_sysvec_apic_timer_interrupt (x86/include/asm/idtentry.h:674)
[    1.045448][    T1]  ? parameq (params.c:91 params.c:99)
[    1.046722][    T1]  ? parameq (linux/fortify-string.h:218 params.c:99)
[    1.051786][    T1]  ? do_initcall_level (linux/srcutree.h:?)
[    1.054571][    T1]  ? parse_args (params.c:153)
[    1.056827][    T1]  do_initcall_level (main.c:1420)
[    1.058834][    T1]  do_initcalls (main.c:1436)
[    1.060827][    T1]  kernel_init_freeable (main.c:1671)
[    1.063560][    T1]  ? rest_init (main.c:?)
[    1.065827][    T1]  kernel_init (main.c:1561)
[    1.067786][    T1]  ret_from_fork (x86/kernel/process.c:158)
[    1.069828][    T1]  ? rest_init (main.c:?)
[    1.072821][    T1]  ret_from_fork_asm (x86/entry/entry_64.S:245)
[    1.074826][    T1]  </TASK>
[    1.076251][    T1] ---[ end trace 0000000000000000 ]---


The kernel config and materials to reproduce are available at:
https://download.01.org/0day-ci/archive/20261010/202610101013.706708d0-lkp@xxxxxxxxx


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https://github.com/intel/lkp-tests/wiki