From hsu@clinet.fi  Fri Jan 19 01:41:07 1996
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Message-Id: <199601190939.LAA20615@katiska.clinet.fi>
Date: Fri, 19 Jan 1996 11:39:31 +0200 (EET)
From: Heikki Suonsivu <hsu@clinet.fi>
Reply-To: hsu@clinet.fi
To: FreeBSD-gnats-submit@freebsd.org
Subject: Kernel page fault, null callp in syscall
X-Send-Pr-Version: 3.2

>Number:         956
>Category:       kern
>Synopsis:       Kernel page fault, null callp
>Confidential:   no
>Severity:       serious
>Priority:       high
>Responsible:    freebsd-bugs
>State:          closed
>Quarter:
>Keywords:
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Fri Jan 19 01:50:03 PST 1996
>Closed-Date:    Tue Oct 22 01:44:44 PDT 1996
>Last-Modified:  Tue Oct 22 01:45:19 PDT 1996
>Originator:     Heikki Suonsivu
>Release:        FreeBSD 2.2-CURRENT i386
>Organization:
Clinet, Espoo, Finland
>Environment:

	Loaded news & user & WWW server.

Jan 18 21:16:25 katiska /kernel: FreeBSD 2.2-CURRENT #7: Mon Jan  8 04:58:16 EET 1996
Jan 18 21:16:25 katiska /kernel:     hsu@katiska.clinet.fi:/usr/current/src/sys/compile/CLINETSERVER
Jan 18 21:16:26 katiska /kernel: CPU: Pentium (90.19-MHz 586-class CPU)
Jan 18 21:16:26 katiska /kernel:   Origin = "GenuineIntel"  Id = 0x524  Stepping=4
Jan 18 21:16:26 katiska /kernel:   Features=0x1bf<FPU,VME,PSE,MCE,CX8,APIC>
Jan 18 21:16:26 katiska /kernel: real memory  = 67108864 (65536K bytes)
Jan 18 21:16:26 katiska /kernel: avail memory = 63537152 (62048K bytes)
Jan 18 21:16:26 katiska /kernel: DEVFS: ready for devices
Jan 18 21:16:26 katiska /kernel: Probing for devices on the PCI bus:
Jan 18 21:16:26 katiska /kernel: chip0 <Intel 82434NX (Neptune) PCI cache memory controller> rev 17 on pci0:0
Jan 18 21:16:26 katiska /kernel: chip1 <Intel 82378IB PCI-ISA bridge> rev 67 on pci0:2
Jan 18 21:16:26 katiska /kernel: de0 <Digital DC21040 Ethernet> rev 35 int a irq 11 on pci0:6
Jan 18 21:16:27 katiska /kernel: de0: DC21040 [10Mb/s] pass 2.3 Ethernet address 00:c0:95:ec:47:a3
Jan 18 21:16:27 katiska /kernel: de0: enabling Thinwire/AUI port
Jan 18 21:16:27 katiska /kernel: ncr0 <ncr 53c810 scsi> rev 2 int a irq 9 on pci0:12
Jan 18 21:16:27 katiska /kernel: ncr0 waiting for scsi devices to settle
Jan 18 21:16:27 katiska /kernel: (ncr0:0:0): "SEAGATE ST15230N 0298" type 0 fixed SCSI 2
Jan 18 21:16:27 katiska /kernel: sd0(ncr0:0:0): Direct-Access 
Jan 18 21:16:27 katiska /kernel: sd0(ncr0:0:0): FAST SCSI-2 100ns (10 Mb/sec) offset 8.
Jan 18 21:16:27 katiska /kernel: 4095MB (8386733 512 byte sectors)
Jan 18 21:16:27 katiska /kernel: sd0(ncr0:0:0): with 3992 cyls, 19 heads, and an average 110 sectors/track
Jan 18 21:16:27 katiska /kernel: (ncr0:3:0): "SEAGATE ST31200N 9348" type 0 fixed SCSI 2
Jan 18 21:16:27 katiska /kernel: sd3(ncr0:3:0): Direct-Access 
Jan 18 21:16:27 katiska /kernel: sd3(ncr0:3:0): FAST SCSI-2 100ns (10 Mb/sec) offset 8.
Jan 18 21:16:27 katiska /kernel: 1011MB (2072435 512 byte sectors)
Jan 18 21:16:27 katiska /kernel: sd3(ncr0:3:0): with 2700 cyls, 9 heads, and an average 85 sectors/track
Jan 18 21:16:27 katiska /kernel: (ncr0:4:0): "HP C1533A 9503" type 1 removable SCSI 2
Jan 18 21:16:27 katiska /kernel: st4(ncr0:4:0): Sequential-Access 
Jan 18 21:16:27 katiska /kernel: st4(ncr0:4:0): FAST SCSI-2 100ns (10 Mb/sec) offset 8.
Jan 18 21:16:27 katiska /kernel: density code 0x24, 512-byte blocks, write-enabled
Jan 18 21:16:27 katiska /kernel: ncr1 <ncr 53c810 scsi> rev 1 int a irq 9 on pci0:14
Jan 18 21:16:27 katiska /kernel: ncr1 waiting for scsi devices to settle
Jan 18 21:16:27 katiska /kernel: (ncr1:1:0): "SEAGATE ST15230N 0638" type 0 fixed SCSI 2
Jan 18 21:16:27 katiska /kernel: sd7(ncr1:1:0): Direct-Access 
Jan 18 21:16:27 katiska /kernel: sd7(ncr1:1:0): FAST SCSI-2 100ns (10 Mb/sec) offset 8.
Jan 18 21:16:27 katiska /kernel: 4095MB (8386733 512 byte sectors)
Jan 18 21:16:27 katiska /kernel: sd7(ncr1:1:0): with 3992 cyls, 19 heads, and an average 110 sectors/track
Jan 18 21:16:28 katiska /kernel: (ncr1:2:0): "SEAGATE ST15230N 0638" type 0 fixed SCSI 2
Jan 18 21:16:28 katiska /kernel: sd8(ncr1:2:0): Direct-Access 
Jan 18 21:16:28 katiska /kernel: sd8(ncr1:2:0): FAST SCSI-2 100ns (10 Mb/sec) offset 8.
Jan 18 21:16:28 katiska /kernel: 4095MB (8386733 512 byte sectors)
Jan 18 21:16:28 katiska /kernel: sd8(ncr1:2:0): with 3992 cyls, 19 heads, and an average 110 sectors/track
Jan 18 21:16:28 katiska /kernel: Probing for devices on the ISA bus:
Jan 18 21:16:28 katiska /kernel: vt0 at 0x60-0x6f irq 1 on motherboard
Jan 18 21:16:28 katiska /kernel: vt0: generic, 80/132 col, mono, 8 scr, mf2-kbd, [R3.20-b24]
Jan 18 21:16:28 katiska /kernel: ed0 not found at 0x280
Jan 18 21:16:28 katiska /kernel: lpt0 at 0x378-0x37f irq 7 on isa
Jan 18 21:16:28 katiska /kernel: lpt0: Interrupt-driven port
Jan 18 21:16:28 katiska /kernel: lp0: TCP/IP capable interface
Jan 18 21:16:28 katiska /kernel: lpt1 not found at 0xffffffff
Jan 18 21:16:28 katiska /kernel: sio0 at 0x3f8-0x3ff irq 4 on isa
Jan 18 21:16:28 katiska /kernel: sio0: type 16550A
Jan 18 21:16:28 katiska /kernel: sio1 at 0x2f8-0x2ff irq 3 on isa
Jan 18 21:16:28 katiska /kernel: sio1: type 16550A
Jan 18 21:16:29 katiska /kernel: pca0 on motherboard
Jan 18 21:16:29 katiska /kernel: pca0: PC speaker audio driver
Jan 18 21:16:29 katiska /kernel: cy0 not found
Jan 18 21:16:29 katiska /kernel: bt0 not found at 0x330
Jan 18 21:16:29 katiska /kernel: aha0 not found at 0x330
Jan 18 21:16:29 katiska /kernel: wdc0 not found at 0x1f0
Jan 18 21:16:29 katiska /kernel: fdc0 at 0x3f0-0x3f7 irq 6 drq 2 on isa
Jan 18 21:16:29 katiska /kernel: fdc0: NEC 72065B
Jan 18 21:16:29 katiska /kernel: fd0: 1.44MB 3.5in
Jan 18 21:16:29 katiska /kernel: matcdc0 not found at 0x230
Jan 18 21:16:29 katiska /kernel: npx0 on motherboard
Jan 18 21:16:29 katiska /kernel: npx0: INT 16 interface
Jan 18 21:16:29 katiska /kernel: changing root device to sd0a
Jan 18 21:16:29 katiska /kernel: devfs ready to run
Jan 18 21:16:29 katiska /kernel: new masks: bio c0000240, tty c003089a, net c003089a
Jan 18 21:16:29 katiska /kernel: WARNING: / was not properly dismounted.

>Description:

[Dumps are available in ftp://ftp.clinet.fi/pub/FreeBSD/crashdumps/*.51.gz]

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hsu#katiska.clinet.fi Thu 1: gdb -k kernel.51 vmcore.51
GDB is free software and you are welcome to distribute copies of it
 under certain conditions; type "show copying" to see the conditions.
There is absolutely no warranty for GDB; type "show warranty" for details.
GDB 4.13 (i386-unknown-freebsd), 
Copyright 1994 Free Software Foundation, Inc...
IdlePTD 257000
current pcb at 212e50
panic: page fault
#0  boot (howto=256) at ../../i386/i386/machdep.c:931
931					dumppcb.pcb_ptd = rcr3();
(kgdb) bt
#0  boot (howto=256) at ../../i386/i386/machdep.c:931
#1  0xf0115e43 in panic (fmt=0xf01c300e "page fault")
    at ../../kern/subr_prf.c:126
#2  0xf01c3b2a in trap_fatal (frame=0xefbffee4) at ../../i386/i386/trap.c:757
#3  0xf01c369c in trap_pfault (frame=0xefbffee4, usermode=0)
    at ../../i386/i386/trap.c:679
#4  0xf01c333b in trap (frame={tf_es = 16, tf_ds = 16, tf_edi = 0, 
      tf_esi = -235949056, tf_ebp = -272629940, tf_isp = -272630004, 
      tf_ebx = -237227776, tf_edx = 1, tf_ecx = -238216768, tf_eax = 0, 
      tf_trapno = 12, tf_err = 0, tf_eip = -267190841, tf_cs = 8, 
      tf_eflags = 66118, tf_esp = -272629868, tf_ss = -237227776})
    at ../../i386/i386/trap.c:320
#5  0xf01b9211 in calltrap ()
#6  0xf01c3df7 in syscall (frame={tf_es = 39, tf_ds = 39, tf_edi = 1214276, 
      tf_esi = 1, tf_ebp = -272640208, tf_isp = -272629788, tf_ebx = 19767, 
      tf_edx = 1229324, tf_ecx = 1231300, tf_eax = 95, tf_trapno = 7, 
      tf_err = 518, tf_eip = 136028837, tf_cs = 31, tf_eflags = 518, 
      tf_esp = -272640240, tf_ss = 39}) at ../../i386/i386/trap.c:917
#7  0xf01b925d in Xsyscall ()
#8  0x2bd11 in ?? ()
#9  0x2ab19 in ?? ()
#10 0xefbfe12c in ?? ()
#11 0x416e in ?? ()
---Type <return> to continue, or q <return> to quit---
#12 0x2dcc1 in ?? ()
#13 0x31caf in ?? ()
#14 0x2cdc1 in ?? ()
#15 0x6c128 in ?? ()
#16 0x2c99d in ?? ()
#17 0x6bd8a in ?? ()
#18 0x2c968 in ?? ()
#19 0x2c4d6 in ?? ()
#20 0x2c5a1 in ?? ()
#21 0x2b727 in ?? ()
#22 0x1096 in ?? ()
(kgdb) up
#1  0xf0115e43 in panic (fmt=0xf01c300e "page fault")
    at ../../kern/subr_prf.c:126
126		boot(bootopt);
(kgdb) up
#2  0xf01c3b2a in trap_fatal (frame=0xefbffee4) at ../../i386/i386/trap.c:757
757			panic(trap_msg[type]);
(kgdb) print type
$1 = 12
(kgdb) print trap_msg[type
syntax error
(kgdb) print trap_msg[type][type]
$2 = 0xf01c300e "page fault"
(kgdb) up
#3  0xf01c369c in trap_pfault (frame=0xefbffee4, usermode=0)
    at ../../i386/i386/trap.c:679
679			trap_fatal(frame);
(kgdb) list
674		if (!usermode) {
675			if (curpcb && curpcb->pcb_onfault) {
676				frame->tf_eip = (int)curpcb->pcb_onfault;
677				return (0);
678			}
679			trap_fatal(frame);
680			return (-1);
681		}
682	
683		/* kludge to pass faulting virtual address to sendsig */
(kgdb) up
#4  0xf01c333b in trap (frame={tf_es = 16, tf_ds = 16, tf_edi = 0, 
      tf_esi = -235949056, tf_ebp = -272629940, tf_isp = -272630004, 
      tf_ebx = -237227776, tf_edx = 1, tf_ecx = -238216768, tf_eax = 0, 
      tf_trapno = 12, tf_err = 0, tf_eip = -267190841, tf_cs = 8, 
      tf_eflags = 66118, tf_esp = -272629868, tf_ss = -237227776})
    at ../../i386/i386/trap.c:320
320				(void) trap_pfault(&frame, FALSE);
(kgdb) list
315		} else {
316			/* kernel trap */
317	
318			switch (type) {
319			case T_PAGEFLT:			/* page fault */
320				(void) trap_pfault(&frame, FALSE);
321				return;
322	
323			case T_PROTFLT:		/* general protection fault */
324			case T_SEGNPFLT:	/* segment not present fault */
(kgdb) up
#5  0xf01b9211 in calltrap ()
(kgdb) list
325				/*
326				 * Invalid segment selectors and out of bounds
327				 * %eip's and %esp's can be set up in user mode.
328				 * This causes a fault in kernel mode when the
329				 * kernel tries to return to user mode.  We want
330				 * to get this fault so that we can fix the
331				 * problem here and not have to check all the
332				 * selectors and pointers when the user changes
333				 * them.
334				 */
(kgdb) up
#6  0xf01c3df7 in syscall (frame={tf_es = 39, tf_ds = 39, tf_edi = 1214276, 
      tf_esi = 1, tf_ebp = -272640208, tf_isp = -272629788, tf_ebx = 19767, 
      tf_edx = 1229324, tf_ecx = 1231300, tf_eax = 95, tf_trapno = 7, 
      tf_err = 518, tf_eip = 136028837, tf_cs = 31, tf_eflags = 518, 
      tf_esp = -272640240, tf_ss = 39}) at ../../i386/i386/trap.c:917
917		error = (*callp->sy_call)(p, args, rval);
(kgdb) list
912			ktrsyscall(p->p_tracep, code, callp->sy_narg, args);
913	#endif
914		rval[0] = 0;
915		rval[1] = frame.tf_edx;
916	
917		error = (*callp->sy_call)(p, args, rval);
918	
919		switch (error) {
920	
921		case 0:
(kgdb) print callp
$3 = (struct sysent *) 0x0
(kgdb) print p
$4 = (struct proc *) 0xf1efb400
(kgdb) print args
$5 = {1, 1220952, 136077408, 1229324, 18, -272629828, 47, 0}
(kgdb) print rval
$6 = {0, 1229324}
(kgdb) print callp
$7 = (struct sysent *) 0x0
(kgdb) up
#7  0xf01b925d in Xsyscall ()
(kgdb) list
922			/*
923			 * Reinitialize proc pointer `p' as it may be different
924			 * if this is a child returning from fork syscall.
925			 */
926			p = curproc;
927			frame.tf_eax = rval[0];
928			frame.tf_edx = rval[1];
929			frame.tf_eflags &= ~PSL_C;
930			break;
931	
(kgdb) print p
No symbol "p" in current context.
(kgdb) exi   down
#6  0xf01c3df7 in syscall (frame={tf_es = 39, tf_ds = 39, tf_edi = 1214276, 
      tf_esi = 1, tf_ebp = -272640208, tf_isp = -272629788, tf_ebx = 19767, 
      tf_edx = 1229324, tf_ecx = 1231300, tf_eax = 95, tf_trapno = 7, 
      tf_err = 518, tf_eip = 136028837, tf_cs = 31, tf_eflags = 518, 
      tf_esp = -272640240, tf_ss = 39}) at ../../i386/i386/trap.c:917
917		error = (*callp->sy_call)(p, args, rval);
(kgdb) list 900
895	 		code &= p->p_sysent->sv_mask;
896	
897	 	if (code >= p->p_sysent->sv_size)
898	 		callp = &p->p_sysent->sv_table[0];
899	  	else
900	 		callp = &p->p_sysent->sv_table[code];
901	
902		if ((i = callp->sy_narg * sizeof(int)) &&
903		    (error = copyin(params, (caddr_t)args, (u_int)i))) {
904	#ifdef KTRACE
(kgdb) list
905			if (KTRPOINT(p, KTR_SYSCALL))
906				ktrsyscall(p->p_tracep, code, callp->sy_narg, args);
907	#endif
908			goto bad;
909		}
910	#ifdef KTRACE
911		if (KTRPOINT(p, KTR_SYSCALL))
912			ktrsyscall(p->p_tracep, code, callp->sy_narg, args);
913	#endif
914		rval[0] = 0;
(kgdb) 
915		rval[1] = frame.tf_edx;
916	
917		error = (*callp->sy_call)(p, args, rval);
918	
919		switch (error) {
920	
921		case 0:
922			/*
923			 * Reinitialize proc pointer `p' as it may be different
924			 * if this is a child returning from fork syscall.
(kgdb) list 800
795	int trapwrite(addr)
796		unsigned addr;
797	{
798		struct proc *p;
799		vm_offset_t va, v;
800		struct vmspace *vm;
801		int rv;
802	
803		va = trunc_page((vm_offset_t)addr);
804		/*
(kgdb) list
805		 * XXX - MAX is END.  Changed > to >= for temp. fix.
806		 */
807		if (va >= VM_MAXUSER_ADDRESS)
808			return (1);
809	
810		p = curproc;
811		vm = p->p_vmspace;
812	
813		++p->p_lock;
814	
(kgdb) 
815		if ((caddr_t)va >= vm->vm_maxsaddr
816		    && (caddr_t)va < (caddr_t)USRSTACK) {
817			if (!grow(p, va)) {
818				--p->p_lock;
819				return (1);
820			}
821		}
822	
823		v = trunc_page(vtopte(va));
824	
(kgdb) 
825		/*
826		 * wire the pte page
827		 */
828		if (va < USRSTACK) {
829			vm_map_pageable(&vm->vm_map, v, round_page(v+1), FALSE);
830		}
831	
832		/*
833		 * fault the data page
834		 */
(kgdb) 
835		rv = vm_fault(&vm->vm_map, va, VM_PROT_READ|VM_PROT_WRITE, FALSE);
836	
837		/*
838		 * unwire the pte page
839		 */
840		if (va < USRSTACK) {
841			vm_map_pageable(&vm->vm_map, v, round_page(v+1), TRUE);
842		}
843	
844		--p->p_lock;
(kgdb) 
845	
846		if (rv != KERN_SUCCESS)
847			return 1;
848	
849		return (0);
850	}
851	
852	/*
853	 * System call request from POSIX system call gate interface to kernel.
854	 * Like trap(), argument is call by reference.
(kgdb) 
855	 */
856	void
857	syscall(frame)
858		struct trapframe frame;
859	{
860		caddr_t params;
861		int i;
862		struct sysent *callp;
863		struct proc *p = curproc;
864		u_quad_t sticks;
(kgdb) 
865		int error;
866		int args[8], rval[2];
867		u_int code;
868	
869		sticks = p->p_sticks;
870		if (ISPL(frame.tf_cs) != SEL_UPL)
871			panic("syscall");
872	
873		p->p_md.md_regs = (int *)&frame;
874		params = (caddr_t)frame.tf_esp + sizeof(int);
(kgdb) 
875		code = frame.tf_eax;
876		/*
877		 * Need to check if this is a 32 bit or 64 bit syscall.
878		 */
879		if (code == SYS_syscall) {
880			/*
881			 * Code is first argument, followed by actual args.
882			 */
883			code = fuword(params);
884			params += sizeof(int);
(kgdb) 
885		} else if (code == SYS___syscall) {
886			/*
887			 * Like syscall, but code is a quad, so as to maintain
888			 * quad alignment for the rest of the arguments.
889			 */
890			code = fuword(params);
891			params += sizeof(quad_t);
892		}
893	
894	 	if (p->p_sysent->sv_mask)
(kgdb) 
895	 		code &= p->p_sysent->sv_mask;
896	
897	 	if (code >= p->p_sysent->sv_size)
898	 		callp = &p->p_sysent->sv_table[0];
899	  	else
900	 		callp = &p->p_sysent->sv_table[code];
901	
902		if ((i = callp->sy_narg * sizeof(int)) &&
903		    (error = copyin(params, (caddr_t)args, (u_int)i))) {
904	#ifdef KTRACE
(kgdb) 
905			if (KTRPOINT(p, KTR_SYSCALL))
906				ktrsyscall(p->p_tracep, code, callp->sy_narg, args);
907	#endif
908			goto bad;
909		}
910	#ifdef KTRACE
911		if (KTRPOINT(p, KTR_SYSCALL))
912			ktrsyscall(p->p_tracep, code, callp->sy_narg, args);
913	#endif
914		rval[0] = 0;
(kgdb) 
915		rval[1] = frame.tf_edx;
916	
917		error = (*callp->sy_call)(p, args, rval);
918	
919		switch (error) {
920	
921		case 0:
922			/*
923			 * Reinitialize proc pointer `p' as it may be different
924			 * if this is a child returning from fork syscall.
(kgdb) print frame
$8 = {tf_es = 39, tf_ds = 39, tf_edi = 1214276, tf_esi = 1, 
  tf_ebp = -272640208, tf_isp = -272629788, tf_ebx = 19767, tf_edx = 1229324, 
  tf_ecx = 1231300, tf_eax = 95, tf_trapno = 7, tf_err = 518, 
  tf_eip = 136028837, tf_cs = 31, tf_eflags = 518, tf_esp = -272640240, 
  tf_ss = 39}
(kgdb) print       print code
$9 = 95
(kgdb) print p
$10 = (struct proc *) 0xf1efb400
(kgdb) print p->p_sysent
$11 = (struct sysentvec *) 0xf1c69954
(kgdb) print p->p_sysent->sv_table[code][code]
Cannot access memory at address 0x1694637c.
(kgdb) print p->p_sysent->sv_table[code][K
$12 = (struct sysent *) 0x16946084
(kgdb) print p->p_sysent->sv_table(kgdb) print [1@*
Cannot access memory at address 0x16946084.
(kgdb) print *p->p_sysent->sv_table               ysent 
$13 = {sv_size = -1856762694, sv_table = 0x16946084, sv_mask = 4059800832, 
  sv_sigsize = 358187, sv_sigtbl = 0x0, sv_errsize = -1292224025, 
  sv_errtbl = 0x974e25d3, sv_fixup = 0x93f21924}
(kgdb) set raix  dix 16
Input and output radices now set to decimal 16, hex 10, octal 20.
(kgdb) set radix 16(kgdb) print *p->p_sysent 
$14 = {sv_size = 0x91540cba, sv_table = 0x16946084, sv_mask = 0xf1fba500, 
  sv_sigsize = 0x5772b, sv_sigtbl = 0x0, sv_errsize = 0xb2fa39e7, 
  sv_errtbl = 0x974e25d3, sv_fixup = 0x93f21924}
(kgdb) quit
hsu#katiska.clinet.fi Thu 2: 

Script done on Thu Jan 18 21:27:42 1996

>How-To-Repeat:

	Put 50 users, a full news server and loaded apache server in the
	same machine.

>Fix:
	
	

>Release-Note:
>Audit-Trail:
State-Changed-From-To: open->feedback 
State-Changed-By: scrappy 
State-Changed-When: Mon Oct 21 23:33:30 PDT 1996 
State-Changed-Why:  

Dust off the cobwebs - Confirm Status 
State-Changed-From-To: feedback->closed 
State-Changed-By: scrappy 
State-Changed-When: Tue Oct 22 01:44:44 PDT 1996 
State-Changed-Why:  

Originator Confirmed Closure 
>Unformatted:
