Panic on Scheduler::_Finisher

[emitrax]

Happened with latest rev while doing the following

dd if=/dev/zero of=/the/file bs=2M

Serial debug output

PANIC: page fault, but interrupts were disabled. Touching address 0xdeadbf03 from eip 0x80066337

Welcome to Kernel Debugging Land...
Thread 25 "scsi scheduler" running on CPU 0
kdebug> bt
stack trace for thread 25 "scsi scheduler"
    kernel stack: 0x80266000 to 0x8026a000
frame            caller     <image>:function + offset
 0 80269b44 (+  48) 80055dd1   <kernel>:invoke_debugger_command + 0x00f5
 1 80269b74 (+  64) 80055bc1   <kernel>:invoke_pipe_segment__FP21debugger_command_pipelPc + 0x0079
 2 80269bb4 (+  64) 80055f49   <kernel>:invoke_debugger_command_pipe + 0x009d
 3 80269bf4 (+  48) 80056e24   <kernel>:_ParseCommandPipe__16ExpressionParserRi + 0x0234
 4 80269c24 (+  48) 800567da   <kernel>:EvaluateCommand__16ExpressionParserPCcRi + 0x01de
 5 80269c54 (+ 224) 800581f0   <kernel>:evaluate_debug_command + 0x0088
 6 80269d34 (+  64) 8005420e   <kernel>:kernel_debugger_loop__Fv + 0x01ae
 7 80269d74 (+  48) 80054dd7   <kernel>:kernel_debugger + 0x0117
 8 80269da4 (+ 192) 80054cb5   <kernel>:panic + 0x0029
 9 80269e64 (+  48) 800b8180   <kernel>:page_fault_exception + 0x0078
10 80269e94 (+  12) 800bb776   <kernel>:int_bottom + 0x0036 (nearest)
kernel iframe at 0x80269ea0 (end = 0x80269ef0)
 eax 0x90b92870     ebx 0x90b9407c      ecx 0x90b927e4   edx 0xdeadbeef
 esi 0x90b927d0     edi 0x90b94000      ebp 0x80269f28   esp 0x80269ed4
 eip 0x80066337  eflags 0x210082   
 vector: 0xe, error code: 0x2
11 80269ea0 (+ 136) 80066337   <kernel>:_Finisher__11IOScheduler + 0x008f
12 80269f28 (+  96) 80066a43   <kernel>:_GetNextUnscheduledRequest__11IOScheduler + 0x0177
13 80269f88 (+  48) 80066b85   <kernel>:_Scheduler__11IOScheduler + 0x0015
14 80269fb8 (+  32) 80066c32   <kernel>:_SchedulerThread__11IOSchedulerPv + 0x0012
15 80269fd8 (+  32) 8004ca3b   <kernel>:_create_kernel_thread_kentry__Fv + 0x001b
16 80269ff8 (+2144952328) 8004c9d8   <kernel>:thread_kthread_exit__Fv + 0x0000
kdebug> teams
team           id  parent      name
0x90b7e000      1  0x00000000  kernel_team
0x90b7e8b8     69  0x90b7e000  syslog_daemon
0x90c10ba0    134  0x90c102e8  sh
0x90b7ee88     73  0x90b7e744  input_server
0x90b7e2e8     43  0x90b7e000  registrar
0x90c10e88    138  0x90c1045c  media_addon_server
0x90b7e45c     48  0x90b7e000  debug_server
0x90b7e5d0     49  0x90b7e000  net_server
0x90b7e174    174  0x90c10ba0  dd
0x90b7e744     50  0x90b7e000  app_server
0x90b7ed14     85  0x90b7e000  Tracker
0x90c10000     86  0x90b7e000  Deskbar
0x90c102e8     88  0x90b7e000  Terminal
0x90c1045c     89  0x90b7e000  media_server
0x90c10744     91  0x90b7e000  midi_server
0x90c108b8     92  0x90b7e000  print_server
kdebug> bt 174
stack trace for thread 174 "dd"
    kernel stack: 0x80209000 to 0x8020d000
      user stack: 0x7efef000 to 0x7ffef000
frame            caller     <image>:function + offset
 0 8020c780 (+  32) 80041d42   <kernel>:context_switch__FP6threadT0 + 0x0026
 1 8020c7a0 (+  64) 80041fac   <kernel>:scheduler_reschedule + 0x0248
 2 8020c7e0 (+  48) 800b828e   <kernel>:hardware_interrupt + 0x00a6
 3 8020c810 (+  12) 800bb776   <kernel>:int_bottom + 0x0036 (nearest)
kernel iframe at 0x8020c81c (end = 0x8020c86c)
 eax 0x0            ebx 0x0             ecx 0x800f969c   edx 0x246
 esi 0x90d24a80     edi 0x1820d000      ebp 0x8020c8b4   esp 0x8020c850
 eip 0x800ada07  eflags 0x246      
 vector: 0xfb, error code: 0x0
 4 8020c81c (+ 152) 800ada07   <kernel>:lock_memory_etc + 0x00ff
 5 8020c8b4 (+  48) 8006aff9   <kernel>:LockMemory__8IOBufferlb + 0x003d
 6 8020c8e4 (+  64) 80065fed   <kernel>:ScheduleRequest__11IOSchedulerP9IORequest + 0x002d
 7 8020c924 (+  48) 806db109   <scsi_disk>:das_io__FPvP9IORequest + 0x0029
 8 8020c954 (+  64) 80064ba4   <kernel>:devfs_io__FP9fs_volumeP8fs_vnodePvP9IORequest + 0x0144
 9 8020c994 (+  64) 800952e9   <kernel>:vfs_vnode_io + 0x0029
10 8020c9d4 (+ 224) 80094c5d   <kernel>:do_iterative_fd_io_iterate__FPvP9IORequestPb + 0x024d
11 8020cab4 (+  64) 8009562f   <kernel>:do_iterative_fd_io + 0x015b
12 8020caf4 (+  80) 8059e7e3   <bfs>:bfs_io__FP9fs_volumeP8fs_vnodePvP9IORequest + 0x009b
13 8020cb44 (+  64) 800952e9   <kernel>:vfs_vnode_io + 0x0029
14 8020cb84 (+ 192) 8008c5eb   <kernel>:vfs_write_pages + 0x0063
15 8020cc44 (+  96) 8002f217   <kernel>:write_to_file__FP14file_cache_refPvxlUlUlbUlUl + 0x01ab
16 8020cca4 (+ 208) 8002f895   <kernel>:cache_io__FPvT0xUlPUlb + 0x063d
17 8020cd74 (+  96) 8003004d   <kernel>:file_cache_write + 0x00e1
18 8020cdd4 (+  80) 80593c15   <bfs>:WriteAt__5InodeR11TransactionxPCUcPUl + 0x031d
19 8020ce24 (+  96) 805a0667   <bfs>:bfs_write__FP9fs_volumeP8fs_vnodePvxPCvPUl + 0x00d3
20 8020ce84 (+  64) 8008db70   <kernel>:file_write__FP15file_descriptorxPCvPUl + 0x0044
21 8020cec4 (+  80) 8007e459   <kernel>:common_user_io__FixPvUlb + 0x017d
22 8020cf14 (+  48) 8007e94c   <kernel>:_user_write + 0x0028
23 8020cf44 (+ 100) 800bb9a2   <kernel>:pre_syscall_debug_done + 0x0002 (nearest)
user iframe at 0x8020cfa8 (end = 0x8020d000)
 eax 0x7e           ebx 0x2b7d40        ecx 0x7ffeee50   edx 0xffff0104
 esi 0x0            edi 0x200000        ebp 0x7ffeee8c   esp 0x8020cfdc
 eip 0xffff0104  eflags 0x203      user esp 0x7ffeee50
 vector: 0x63, error code: 0x0
24 8020cfa8 (+   0) ffff0104
25 7ffeee8c (+  48) 0020250a   </boot/beos/bin/dd@0x00200000>:unknown + 0x250a
26 7ffeeebc (+  64) 00203919   </boot/beos/bin/dd@0x00200000>:unknown + 0x3919
27 7ffeeefc (+ 128) 00204078   </boot/beos/bin/dd@0x00200000>:unknown + 0x4078
28 7ffeef7c (+  48) 00201c7b   </boot/beos/bin/dd@0x00200000>:unknown + 0x1c7b
29 7ffeefac (+  48) 001008ea   3867:runtime_loader_seg0ro@0x00100000 + 0x8ea
30 7ffeefdc (+   0) 7ffeefec   3866:dd_main_stack@0x7efef000 + 0xffffec
kdebug> thread 174
THREAD: 0x914e0000
id:                 174 (0xae)
name:               "dd"
all_next:           0x9150d000
team_next:          0x00000000
q_next:             0x9151b800
priority:           10 (next 10)
state:              ready
next_state:         ready
cpu:                0x00000000 
sig_pending:        0x0 (blocked: 0x0)
in_kernel:          1
fault_handler:      0x00000000
args:               0x90d249d8 0x00000000
entry:              0x80049774
team:               0x90b7e174, "dd"
  exit.sem:         2124
  exit.status:      0x0 (No error)
  exit.reason:      0x0
  exit.signal:      0x0
  exit.waiters:
kernel_stack_area:  3864
kernel_stack_base:  0x80209000
user_stack_area:    3866
user_stack_base:    0x7efef000
user_local_storage: 0x7ffef000
kernel_errno:       0x0 (No error)
kernel_time:        5297401
user_time:          84371
flags:              0x200
architecture dependant section:
        esp: 0x8020c724
        ss: 0x00000010
        fpu_state at 0x914e0380
kdebug> 

[bonefish]

Fixed in hrev27070.