sio / puc wedging on both -current and -stable (with trace)

[Mike Tancsa]

At 11:50 PM 17/05/2004, Bruce Evans wrote:

>... Type "s", then hold down the Enter key to repeat the "s" command until
>control returns here, then keep holding down the Enter key until something
>loops (may take many hundreds of commands).  Record all the output using
>a serial console (don't type it in) and send it to me.


OK, I have a trace. Here is a quick snippet. I will send you the complete 
list which is quite long offlist


db> trace
siointr1(c11cf000,c032e6c8,c02b4996,c11cf000,cbf00010) at siointr1+0x139
siointr(c11cf000,cbf00010,a002,cbf036c0,100c0) at siointr+0xc
Xfastintr4(c11cfc00,c032e6f0,c02a73ca,c11cfc00,c0a3f260) at Xfastintr4+0x16
siointr(c11cfc00) at siointr+0xc
puc_intr(c11b5200,63103a,0,0,c032e758) at puc_intr+0x4e
intr_mux(c0a3f260,0,c0000010,10,cbf00010) at intr_mux+0x1f
Xresume12() at Xresume12+0x2b
--- interrupt, eip = 0xc02ba5b6, esp = 0xc032e750, ebp = 0xc032e758 ---
cpu_idle(10,f29,2,bfebfbff,1080a) at cpu_idle+0xe
idle_loop() at idle_loop+0x1d
db> s
Stopped at      siointr1+0x148: movl    0x38(%esi),%ebx
db>
Stopped at      siointr1+0x14b: cmpl    0x2c(%esi),%ebx
db>
Stopped at      siointr1+0x14e: jb      siointr1+0x158
db>
Stopped at      siointr1+0x158: cmpb    $0,0x148(%esi)
db>
Stopped at      siointr1+0x15f: jz      siointr1+0x170
db>
Stopped at      siointr1+0x170: incl    com_events
db>
Stopped at      siointr1+0x176: call    schedsofttty
db>
Stopped at      schedsofttty:   movl    $0x10000,%eax
db>
Stopped at      schedsofttty+0x5:       orl     %eax,idelayed
db>
Stopped at      schedsofttty+0xb:       ret
db>
Stopped at      siointr1+0x17b: movb    0xfffffff7(%ebp),%dl
db>
Stopped at      siointr1+0x17e: movb    %dl,0(%ebx)
db>
Stopped at      siointr1+0x180: movl    0x40(%esi),%eax
db>
Stopped at      siointr1+0x183: movb    0xfffffffc(%ebp),%dl
db>
Stopped at      siointr1+0x186: movb    %dl,0(%eax,%ebx,1)
db>
Stopped at      siointr1+0x189: incl    %ebx
db>
Stopped at      siointr1+0x18a: movl    %ebx,0x38(%esi)
db>
Stopped at      siointr1+0x18d: cmpl    0x34(%esi),%ebx
db>
Stopped at      siointr1+0x190: jnz     siointr1+0x1a7
db>
Stopped at      siointr1+0x1a7: movb    0xfffffffc(%ebp),%al
db>
Stopped at      siointr1+0x1aa: testb   $0x2,%al
db>
Stopped at      siointr1+0x1ac: jz      siointr1+0x1b4
db>
Stopped at      siointr1+0x1b4: movl    0x88(%esi),%edx
db>
Stopped at      siointr1+0x1ba: inb     %dx,%al
db>
Stopped at      siointr1+0x1bb: movb    %al,%dl
db>
Stopped at      siointr1+0x1bd: andb    $0x7f,%dl
db>
Stopped at      siointr1+0x1c0: movb    %dl,0xfffffffc(%ebp)
db>
Stopped at      siointr1+0x1c3: testb   $0x1f,%al
db>
Stopped at      siointr1+0x1c5: jnz     siointr1+0x94
db>
Stopped at      siointr1+0x94:  movb    0xfffffffc(%ebp),%dl
db>
Stopped at      siointr1+0x97:  testb   $0x1,%dl
db>
Stopped at      siointr1+0x9a:  jnz     siointr1+0xa4
db>
Stopped at      siointr1+0xa4:  movl    0x7c(%esi),%edx
db>
Stopped at      siointr1+0xa7:  inb     %dx,%al
db>
Stopped at      siointr1+0xa8:  movb    %al,0xfffffff7(%ebp)
db>
Stopped at      siointr1+0xab:  testb   $0x1c,0xfffffffc(%ebp)
db>
Stopped at      siointr1+0xaf:  jz      siointr1+0x12f
db>
Stopped at      siointr1+0x12f: incl    0x1b8(%esi)
db>
Stopped at      siointr1+0x135: cmpb    $0,0x26(%esi)
db>
Stopped at      siointr1+0x139: jz      siointr1+0x148
db>
Stopped at      siointr1+0x148: movl    0x38(%esi),%ebx
db>
Stopped at      siointr1+0x14b: cmpl    0x2c(%esi),%ebx
db>
Stopped at      siointr1+0x14e: jb      siointr1+0x158
db>
Stopped at      siointr1+0x158: cmpb    $0,0x148(%esi)
db>
Stopped at      siointr1+0x15f: jz      siointr1+0x170
.
.
< stuff deleted >
.

Stopped at      siointr1+0x1c5: jnz     siointr1+0x94
db>
Stopped at      siointr1+0x94:  movb    0xfffffffc(%ebp),%dl
db>
Stopped at      siointr1+0x97:  testb   $0x1,%dl
db>
Stopped at      siointr1+0x9a:  jnz     siointr1+0xa4
db>
Stopped at      siointr1+0xa4:  movl    0x7c(%esi),%edx
db>
Stopped at      siointr1+0xa7:  inb     %dx,%al
db>
Stopped at      siointr1+0xa8:  movb    %al,0xfffffff7(%ebp)
db>
Stopped at      siointr1+0xab:  testb   $0x1c,0xfffffffc(%ebp)
db>
Stopped at      siointr1+0xaf:  jz      siointr1+0x12f
db>
Stopped at      siointr1+0x12f: incl    0x1b8(%esi)
db>
Stopped at      siointr1+0x135: cmpb    $0,0x26(%esi)
db>
Stopped at      siointr1+0x139: jz      siointr1+0x148
db>
Stopped at      siointr1+0x148: movl    0x38(%esi),%ebx
db>
Stopped at      siointr1+0x14b: cmpl    0x2c(%esi),%ebx
db> trace
siointr1(c11cf000,c032e6c8,c02b4996,c11cf000,cbf00010) at siointr1+0x14b
siointr(c11cf000,cbf00010,a005,cbf036c0,10060) at siointr+0xc
Xfastintr4(c11cfc00,c032e6f0,c02a73ca,c11cfc00,c0a3f260) at Xfastintr4+0x16
siointr(c11cfc00) at siointr+0xc
puc_intr(c11b5200,63103a,0,0,c032e758) at puc_intr+0x4e
intr_mux(c0a3f260,0,c0000010,10,cbf00010) at intr_mux+0x1f
Xresume12() at Xresume12+0x2b
--- interrupt, eip = 0xc02ba5b6, esp = 0xc032e750, ebp = 0xc032e758 ---
cpu_idle(10,f29,2,bfebfbff,1080a) at cpu_idle+0xe
idle_loop() at idle_loop+0x1d
db> panic
panic: from debugger
Debugger("panic")


Fatal trap 3: breakpoint instruction fault while in kernel mode
instruction pointer     = 0x8:0xc02b3925
stack pointer           = 0x10:0xc032e4bc
frame pointer           = 0x10:0xc032e4c4
code segment            = base 0x0, limit 0xfffff, type 0x1b
                         = DPL 0, pres 1, def32 1, gran 1
processor eflags        = interrupt enabled, IOPL = 0
current process         = Idle
interrupt mask          = tty
Stopped at      siointr1+0x14b: cmpl    0x2c(%esi),%ebx
db> panic
panic: from debugger
Uptime: 1h18m19s

dumping to dev #ad/0x20001, offset 1575040
dump ata0: resetting devices .. done
254 253 252 251 250 249 248 247 246


         ---Mike