[bug report] WARNING when nvme_probe

[Chen Wang]

Hello,

When I test with latest 6.13-rc1, I see kernel complains as below, but I 
don't see this in 6.12 serials (6.12-rc1 & 6.12-rc7).

I'm developing PCIe driver and there is a RC switch which has some 
devices conneted to, including a  nvme device.

Can somebody help double-check and comment?

Sent to NVME related mails and CCed to MM, who might be interested in 
this question.

Thanks,

Chen


[    2.075408] ------------[ cut here ]------------
[    2.075414] WARNING: CPU: 51 PID: 403 at mm/page_alloc.c:4727 
__alloc_pages_noprof+0x788/0xd08
[    2.075432] Modules linked in:
[    2.075442] CPU: 51 UID: 0 PID: 403 Comm: kworker/u257:0 Not tainted 
6.13.0-rc1+ #1
[    2.075449] Hardware name: Milk-V Pioneer (DT)
[    2.075454] Workqueue: async async_run_entry_fn
[    2.075467] epc : __alloc_pages_noprof+0x788/0xd08
[    2.075473]  ra : __dma_direct_alloc_pages.isra.0+0x1f8/0x434
[    2.075480] epc : ffffffff8029e252 ra : ffffffff800d1f96 sp : 
ffffffd7017bb840
[    2.075485]  gp : ffffffff82072a28 tp : ffffffd701761c00 t0 : 
ffffffd703b023b8
[    2.075488]  t1 : 0000000000000000 t2 : 6d7768206e6f6d77 s0 : 
ffffffd7017bb9e0
[    2.075491]  s1 : 0000000000000cc0 a0 : 0000000000000cc0 a1 : 
000000000000000e
[    2.075495]  a2 : 0000000000000000 a3 : 0000000000000000 a4 : 
0000000000000001
[    2.075498]  a5 : ffffffff82013d7a a6 : 3fffffffffffffff a7 : 
000000000000003e
[    2.075501]  s2 : ffffffffffffffff s3 : 0000000000000000 s4 : 
0000000004000000
[    2.075504]  s5 : 0000000000003fff s6 : ffffffffffffffff s7 : 
000000000000000e
[    2.075508]  s8 : ffffffff8213d190 s9 : 000000000000000e s10: 
0000000000000100
[    2.075510]  s11: ffffffd70034d3c0 t3 : ffffffd700260f00 t4 : 
ffffffd700260f00
[    2.075514]  t5 : ffffffd700260000 t6 : ffffffd7017bb6d8
[    2.075516] status: 0000000200000120 badaddr: 0000000000000000 cause: 
0000000000000003
[    2.075521] [<ffffffff8029e252>] __alloc_pages_noprof+0x788/0xd08
[    2.075527] [<ffffffff800d1f96>] 
__dma_direct_alloc_pages.isra.0+0x1f8/0x434
[    2.075533] [<ffffffff800d27ac>] dma_direct_alloc_pages+0x28/0x11c
[    2.075537] [<ffffffff800cdc54>] __dma_alloc_pages+0x3a/0x54
[    2.075547] [<ffffffff800d199c>] dma_alloc_noncontiguous+0x8e/0x1c6
[    2.075551] [<ffffffff80a3f352>] nvme_setup_host_mem+0x2a8/0x446
[    2.075558] [<ffffffff80a42dbc>] nvme_probe+0x730/0x802
[    2.075564] [<ffffffff806fb4dc>] local_pci_probe+0x40/0x82
[    2.075572] [<ffffffff806fc1a6>] pci_device_probe+0xca/0x1f0
[    2.075578] [<ffffffff809a2964>] really_probe+0x9e/0x33e
[    2.075589] [<ffffffff809a2c80>] __driver_probe_device+0x7c/0x132
[    2.075595] [<ffffffff809a2e0c>] driver_probe_device+0x38/0xc6
[    2.075601] [<ffffffff809a3182>] __driver_attach_async_helper+0x4a/0xc4
[    2.075607] [<ffffffff8006616a>] async_run_entry_fn+0x34/0x126
[    2.075613] [<ffffffff80055a16>] process_one_work+0x172/0x316
[    2.075621] [<ffffffff80056626>] worker_thread+0x2e2/0x448
[    2.075626] [<ffffffff8005ee4a>] kthread+0xc2/0xe2
[    2.075633] [<ffffffff80e8de56>] ret_from_fork+0xe/0x1c
[    2.075645] ---[ end trace 0000000000000000 ]---
[    2.094302] nvme nvme0: allocated 64 MiB host memory buffer (16 
segments).
[    2.223519] nvme nvme0: 1/0/0 default/read/poll queues