Date: Thu, 2 Mar 2006 12:53:01 GMT From: Brad Harvell <brad@freebsd.frostbit.org> To: freebsd-gnats-submit@FreeBSD.org Subject: kern/94020: tcp_timer_2msl_tw NULL pointer dereference panic Message-ID: <200603021253.k22Cr14q016082@www.freebsd.org> Resent-Message-ID: <200603021300.k22D0Gj9049049@freefall.freebsd.org>
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>Number: 94020 >Category: kern >Synopsis: tcp_timer_2msl_tw NULL pointer dereference panic >Confidential: no >Severity: critical >Priority: high >Responsible: freebsd-bugs >State: open >Quarter: >Keywords: >Date-Required: >Class: sw-bug >Submitter-Id: current-users >Arrival-Date: Thu Mar 02 13:00:15 GMT 2006 >Closed-Date: >Last-Modified: >Originator: Brad Harvell >Release: 6.0-STABLE >Organization: >Environment: FreeBSD s1.frostbit.org 6.0-STABLE FreeBSD 6.0-STABLE #0: Mon Dec 19 01:16:07 MST 2005 brad@s1.frostbit.org:/usr/obj/usr/src/sys/SIXFOUR amd64 >Description: page fault panic in tcp_timer_2msl_tw(), tw->tw_inpcb is dereferenced to NULL. Pawel Worach reported this problem to the freebsd-net list with 5.4-RELEASE/i386. he included a backtrace which matches up with mine: http://docs.freebsd.org/cgi/mid.cgi?4330711A.4040808 http://docs.freebsd.org/cgi/mid.cgi?4331F3A3.1060707 Fatal trap 12: page fault while in kernel mode cpuid = 0; apic id = 00 fault virtual address = 0x120 fault code = supervisor write, page not present instruction pointer = 0x8:0xffffffff803eb5c8 stack pointer = 0x10:0xffffffffb3b64b00 frame pointer = 0x10:0x4 code segment = base 0x0, limit 0xfffff, type 0x1b = DPL 0, pres 1, long 1, def32 0, gran 1 processor eflags = interrupt enabled, resume, IOPL = 0 current process = 109 (swi4: clock sio) trap number = 12 panic: page fault cpuid = 0 (kgdb) bt #0 doadump () at pcpu.h:172 #1 0x0000000000000004 in ?? () #2 0xffffffff80334087 in boot (howto=260) at /usr/src/sys/kern/kern_shutdown.c:399 #3 0xffffffff80334721 in panic (fmt=0xffffff011f5ea260 "") at /usr/src/sys/kern/kern_shutdown.c:555 #4 0xffffffff804d8f4f in trap_fatal (frame=0xffffff011f5ea260, eva=18446742979019198464) at /usr/src/sys/amd64/amd64/trap.c:660 #5 0xffffffff804d926f in trap_pfault (frame=0xffffffffb3b64a50, usermode=0) at /usr/src/sys/amd64/amd64/trap.c:573 #6 0xffffffff804d9523 in trap (frame= {tf_rdi = 37, tf_rsi = -1094690364832, tf_rdx = 352, tf_rcx = 0, tf_r8 = -1094690364832, tf_r9 = -1097703752096, tf_rax = 4, tf_rbx = -1095116425984, tf_rbp = 4, tf_r10 = -1095116423576, tf_r11 = -1099251533776, tf_r12 = 0, tf_r13 = -2138799016, tf_r14 = -2138799008, tf_r15 = 1, tf_trapno = 12, tf_addr = 288, tf_flags = -2138799016, tf_err = 2, tf_rip = -2143373880, tf_cs = 8, tf_rflags = 66183, tf_rsp = -1279898864, tf_ss = 16}) at /usr/src/sys/amd64/amd64/trap.c:352 #7 0xffffffff804c665b in calltrap () at /usr/src/sys/amd64/amd64/exception.S:168 #8 0xffffffff803eb5c8 in tcp_timer_2msl_tw (reuse=0) at atomic.h:142 #9 0xffffffff803eb680 in tcp_slowtimo () at /usr/src/sys/netinet/tcp_timer.c:136 #10 0xffffffff80376517 in pfslowtimo (arg=0x25) at /usr/src/sys/kern/uipc_domain.c:475 #11 0xffffffff803433b5 in softclock (dummy=0x25) at /usr/src/sys/kern/kern_timeout.c:290 #12 0xffffffff8031b315 in ithread_loop (arg=0xffffff0000d06000) at /usr/src/sys/kern/kern_intr.c:547 #13 0xffffffff80319e57 in fork_exit (callout=0xffffffff8031b230 <ithread_loop>, arg=0xffffff0000d06000, frame=0xffffffffb3b64c50) at /usr/src/sys/kern/kern_fork.c:789 #14 0xffffffff804c69be in fork_trampoline () at /usr/src/sys/amd64/amd64/exception.S:394 #15 0x0000000000000000 in ?? () (kgdb) frame 8 #8 0xffffffff803eb5c8 in tcp_timer_2msl_tw (reuse=0) at atomic.h:142 (kgdb) info loc tw = (struct tcptw *) 0xffffff0105f97500 tw_tail = (struct tcptw *) 0xffffffff80848460 twl = (struct twlist *) 0xffffffff80848458 i = 1 (kgdb) p *tw $1 = {tw_inpcb = 0x0, snd_nxt = 2902930442, rcv_nxt = 766179888, iss = 2902880028, irs = 766179299, last_win = 65534, tw_so_options = 4, tw_cred = 0x0, t_recent = 0, t_starttime = 18446744073709518933, tw_time = 0, tw_2msl = { le_next = 0xffffff000c971c30, le_prev = 0xffffffff80848458}} >How-To-Repeat: unknown >Fix: unknown >Release-Note: >Audit-Trail: >Unformatted:
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