masayuki2009 commented on PR #9837:
URL: https://github.com/apache/nuttx/pull/9837#issuecomment-1637282337

   @xiaoxiang781216 
   
   I noticed that ostest with rv-virt:smp and rv-virt:smp64 fail now.
   
   ```
   user_main: setvbuf test
   setvbuf_test: Test NO buffering
   setvbuf_test: Using NO buffering
   setvbuf_test: Test default FULL buffering
   setvbuf_test: Using default FULL buffering
   setvbuf_test: Test FULL buffering, buffer size 64
   setvbuf_test: Using FULL buffering, buffer size 64
   setvbuf_test: Test FULL buffering, pre-allocated buffer
   setvbuf_test: Using FULL buffering, pre-allocated buffer
   setvbuf_test: Test LINE buffering, buffer size 64
   setvbuf_test: Using LINE buffering, buffer size 64
   setvbuf_test: Test FULL buffering, pre-allocated buffer
   setvbuf_test: Using FULL buffering, pre-allocated buffer
   
   End of test memory usage:
   VARIABLE  BEFORE   AFTER
   ======== ======== ========
   arena     1fd4b60  1fd4b60
   ordblks         5        5
   mxordblk  1fc95f0  1fc95f0
   uordblks     9600     9600
   fordblks  1fcb560  1fcb560
   
   user_main: /dev/null test
   dev_null: ERROR Failed to open /dev/null
   [CPU0] Current Version: NuttX  12.0.0 427f8a1624 Jul 17 2023 10:49:04 risc-v
   [CPU0] Assertion failed : at file: :0 task(CPU0): ostest 0x8001071c
   [CPU0] EPC: 00000000800023f0
   [CPU0] A0: 0000000080029e50 A1: 0000000000000000 A2: 0000000000000000 A3: 
0000000000000000
   [CPU0] A4: 0000000000000001 A5: 0000000000000000 A6: 0000000000000009 A7: 
0000000000000000
   [CPU0] T0: 000000000000002e T1: 000000000000006a T2: 00000000000001ff T3: 
000000000000006c
   [CPU0] T4: 0000000000000068 T5: 0000000000000009 T6: 000000000000002a
   [CPU0] S0: 0000000000000000 S1: 0000000080021938 S2: 0000000080032050 S3: 
0000000000000000
   [CPU0] S4: 0000000000000000 S5: 0000000000000000 S6: 0000000000000000 S7: 
0000000000000000
   [CPU0] S8: 0000000000000000 S9: 0000000000000000 S10: 0000000000000000 S11: 
0000000000000000
   [CPU0] SP: 0000000080036850 FP: 0000000000000000 TP: 0000000000000000 RA: 
00000000800023f0
   [CPU0] User Stack:
   [CPU0]   base: 0x80034a80
   [CPU0]   size: 00008064
   [CPU0]     sp: 0x80036850
   [CPU0] 0x80036840: 80036850 00000000 80002526 00000000 800217d0 00000000 
00000080 0000000a
   [CPU0] 0x80036860: 8002abb0 00000000 7474754e 00000058 80032050 00000000 
8002abb8 00000000
   [CPU0] 0x80036880: 00000000 00000000 00000001 00000000 80032050 00000000 
00000088 2e323100
   [CPU0] 0x800368a0: 00302e30 00000000 80002084 00000000 32340004 61386637 
34323631 6c754a20
   [CPU0] 0x800368c0: 20373120 33323032 3a303120 303a3934 80030034 00000000 
80005720 00000000
   [CPU0] 0x800368e0: 80034a30 73697200 00762d63 00000000 80033fc8 00000000 
80005744 00000000
   [CPU0] 0x80036900: 80033fc8 00000000 00000000 00000000 00000000 00000000 
00000000 00000000
   [CPU0] 0x80036920: 00000004 00000000 00000005 00000000 80034a30 00000000 
80021938 00000000
   [CPU0] 0x80036940: 00000005 00000000 800070c6 00000000 00000005 00000000 
80011b48 00000000
   [CPU0] 0x80036960: 00000005 00000000 80010882 00000000 80034a76 00000000 
80021710 00000000
   [CPU0] 0x80036980: 01fd4b60 00000004 00000063 01fc95f0 000096b0 01fcb4b0 
00000000 00000000
   [CPU0] 0x800369a0: 00000000 00000000 00000000 00000000 00000000 00000000 
00000000 00000000
   [CPU0] 0x800369c0: 8001071c 00000000 80007430 00000000 80034a30 00000000 
00000005 00000000
   [CPU0] 0x800369e0: 00000000 00000000 80003b22 00000000 00000000 00000000 
00000000 00000000
   ```
   
   It seems that `CONFIG_DEV_NULL` is not set now.
   
   ```
   $ grep DEV_NULL .config
   # CONFIG_DEV_NULL is not set
   ```


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