[Bug 257388] MMCCAM : sdhci : uma_zalloc_debug called with lock held

From: <bugzilla-noreply_at_freebsd.org>
Date: Sat, 24 Jul 2021 17:50:31 UTC

            Bug ID: 257388
           Summary: MMCCAM : sdhci : uma_zalloc_debug called with lock
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: manu@freebsd.org

Using sdhci on an MMCCAM enabled kernel will have this logs :
(noperiph:sdhci_slot0:0:-1:ffffffff): (noperiph:sdhci_slot0:0:-1:ffffffff):
sdhci_fdt0-slot0: Card inserted                    
uma_zalloc_debug: zone "malloc-2048" with the following non-sleepable locks
exclusive sleep mutex SD slot mtx (sdhci) r = 0 (0xffff0000e545e030) locked @
stack backtrace:                                                                
#0 0xffff00000042261c at witness_debugger+0x64                                  
#1 0xffff0000004237b0 at witness_warn+0x400                                     
#2 0xffff0000006462d0 at uma_zalloc_debug+0x2c                                  
#3 0xffff000000645cd8 at uma_zalloc_arg+0x2c                                    
#4 0xffff00000038a628 at malloc+0x94                                            
#5 0xffff00000000f54c at xpt_alloc_ccb+0x1c                                     
#6 0xffff0000000350bc at mmccam_start_discovery+0x18                            
#7 0xffff0000e525e1ac at sdhci_card_task+0x118                                  
#8 0xffff0000e5237d40 at sdhci_fdt_attach+0x5b8                                 
#9 0xffff0000003ee29c at device_attach+0x400                                    
#10 0xffff0000003ede04 at device_probe_and_attach+0x7c                          
#11 0xffff0000003efec4 at bus_generic_driver_added+0x74                         
#12 0xffff0000003eb6f0 at devclass_driver_added+0x44                            
#13 0xffff0000003eb78c at devclass_driver_added+0xe0                            
#14 0xffff0000003eb5ec at devclass_add_driver+0x140                             
#15 0xffff00000039015c at module_register_init+0xc4                             
#16 0xffff00000037f9bc at linker_load_module+0xb2c                              
#17 0xffff000000381450 at kern_kldload+0x15c

All the discovery is done with one of the CAM locks held and so malloc

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