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[217.226.54.15]) by smtp.gmail.com with ESMTPSA id l5sm1949645wmi.46.2021.06.08.01.46.47 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 08 Jun 2021 01:46:48 -0700 (PDT) Date: Tue, 8 Jun 2021 10:46:46 +0200 From: Gary Jennejohn To: Mark Johnston Cc: freebsd-current@freebsd.org Subject: Re: kernel panic while copying files Message-ID: <20210608084646.6a7e1bc7@ernst.home> In-Reply-To: References: <20210607090109.08ecb130@ernst.home> Reply-To: gljennjohn@gmail.com X-Mailer: Claws Mail 3.17.8 (GTK+ 2.24.33; amd64-portbld-freebsd14.0) List-Id: Discussions about the use of FreeBSD-current List-Archive: https://lists.freebsd.org/archives/freebsd-current List-Help: List-Post: List-Subscribe: List-Unsubscribe: Sender: owner-freebsd-current@freebsd.org MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: 4FzkPQ2761z3Qmt X-Spamd-Bar: ---- Authentication-Results: mx1.freebsd.org; none X-Spamd-Result: default: False [-4.00 / 15.00]; REPLY(-4.00)[] X-ThisMailContainsUnwantedMimeParts: N On Mon, 7 Jun 2021 16:54:11 -0400 Mark Johnston wrote: > On Mon, Jun 07, 2021 at 11:01:09AM +0200, Gary Jennejohn wrote: > > I've seen this panic three times in the last two days: > > > > [first panic] > > Unread portion of the kernel message buffer: > > > > > > Fatal trap 12: page fault while in kernel mode > > cpuid = 3; apic id = 03 > > fault virtual address = 0x801118000 > > fault code = supervisor write data, page not present > > instruction pointer = 0x20:0xffffffff808d2212 > > stack pointer = 0x28:0xfffffe00dbc8c760 > > frame pointer = 0x28:0xfffffe00dbc8c7a0 > > 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 = 28 (dom0) > > trap number = 12 > > panic: page fault > > cpuid = 3 > > time = 1622963058 > > KDB: stack backtrace: > > db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xfffffe00dbc8c410 > > vpanic() at vpanic+0x181/frame 0xfffffe00dbc8c460 > > panic() at panic+0x43/frame 0xfffffe00dbc8c4c0 > > trap_fatal() at trap_fatal+0x387/frame 0xfffffe00dbc8c520 > > trap_pfault() at trap_pfault+0x4f/frame 0xfffffe00dbc8c580 > > trap() at trap+0x253/frame 0xfffffe00dbc8c690 > > calltrap() at calltrap+0x8/frame 0xfffffe00dbc8c690 > > --- trap 0xc, rip = 0xffffffff808d2212, rsp = 0xfffffe00dbc8c760, rbp = 0xfffffe00dbc8c7a0 --- > > zone_release() at zone_release+0x1f2/frame 0xfffffe00dbc8c7a0 > > bucket_drain() at bucket_drain+0xda/frame 0xfffffe00dbc8c7d0 > > bucket_cache_reclaim_domain() at bucket_cache_reclaim_domain+0x30a/frame 0xfffffe00dbc8c830 > > zone_reclaim() at zone_reclaim+0x162/frame 0xfffffe00dbc8c880 > > uma_reclaim_domain() at uma_reclaim_domain+0xa2/frame 0xfffffe00dbc8c8b0 > > vm_pageout_worker() at vm_pageout_worker+0x41e/frame 0xfffffe00dbc8cb70 > > vm_pageout() at vm_pageout+0x21e/frame 0xfffffe00dbc8cbb0 > > fork_exit() at fork_exit+0x7e/frame 0xfffffe00dbc8cbf0 > > fork_trampoline() at fork_trampoline+0xe/frame 0xfffffe00dbc8cbf0 > > --- trap 0, rip = 0, rsp = 0, rbp = 0 --- > > KDB: enter: panic > > > > __curthread () at /usr/src/sys/amd64/include/pcpu_aux.h:55 > > 55 __asm("movq %%gs:%P1,%0" : "=r" (td) : "n" (offsetof(struct pcpu, > > pc_curthread))); > > > > One difference was that in the second and third panics the fault virtual > > address was 0x0. But the backtrace was the same. > > > > Relevant info from the info.x files: > > Architecture: amd64 > > Architecture Version: 2 > > Version String: FreeBSD 14.0-CURRENT #33 main-n247184-1970d693039: Sat Jun > > 5 09:58:55 CEST 2021 > > > > CPU: AMD Ryzen 5 1600 Six-Core Processor (3194.09-MHz K8-class CPU) > > Origin="AuthenticAMD" Id=0x800f11 Family=0x17 Model=0x1 Stepping=1 > > AMD Features=0x2e500800 > > AMD Features2=0x35c233ff > > AMD Extended Feature Extensions ID EBX=0x1007 > > > > I have 16GiB of memory in the box. > > > > The panic occurred while copying files from an internal SATA SSD to a > > SATA 8TB disk in an external USB3 docking station. The panic seems to > > occur quite quickly, after only a few files have been copied. > > > > swap is on a different internal disk. > > > > I can poke around in the crash dumps with kgdb if anyone wants more > > information. > > Are you running with invariants configured in the kernel? If not, > please try to reproduce this in a kernel with > > options INVARIANT_SUPPORT > options INVARIANTS > > configured. > > A stack trace with line numbers would also be helpful. Thanks for the hint. After enabling INVARIANTS the kernel panics as soon I turn on the external USB3 disk. No user disk access required. Version String: FreeBSD 14.0-CURRENT #34 main-n247239-f570a6723e1: Tue Jun 8 09:34:32 CEST 2021 Here the kgdb backtrace: Unread portion of the kernel message buffer: panic: Duplicate free of 0xfffff800356b9000 from zone 0xfffffe00dcbdd800(da_ccb) slab 0xfffff800356b9fd8(0) cpuid = 8 time = 1623140519 KDB: stack backtrace: db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xfffffe00c5f398c0 vpanic() at vpanic+0x181/frame 0xfffffe00c5f39910 panic() at panic+0x43/frame 0xfffffe00c5f39970 uma_dbg_free() at uma_dbg_free+0x1e1/frame 0xfffffe00c5f399b0 uma_zfree_arg() at uma_zfree_arg+0x147/frame 0xfffffe00c5f39a00 camperiphdone() at camperiphdone+0x1b7/frame 0xfffffe00c5f39b20 xpt_done_process() at xpt_done_process+0x3dd/frame 0xfffffe00c5f39b60 xpt_done_td() at xpt_done_td+0xf5/frame 0xfffffe00c5f39bb0 fork_exit() at fork_exit+0x80/frame 0xfffffe00c5f39bf0 fork_trampoline() at fork_trampoline+0xe/frame 0xfffffe00c5f39bf0 --- trap 0, rip = 0, rsp = 0, rbp = 0 --- KDB: enter: panic __curthread () at /usr/src/sys/amd64/include/pcpu_aux.h:55 55 __asm("movq %%gs:%P1,%0" : "=r" (td) : "n" (offsetof(struct pcpu, (kgdb) bt #0 __curthread () at /usr/src/sys/amd64/include/pcpu_aux.h:55 #1 doadump (textdump=textdump@entry=0) at /usr/src/sys/kern/kern_shutdown.c:399 #2 0xffffffff8040c39a in db_dump (dummy=, dummy2=, dummy3=, dummy4=) at /usr/src/sys/ddb/db_command.c:575 #3 0xffffffff8040c192 in db_command (last_cmdp=, cmd_table=, dopager=dopager@entry=1) at /usr/src/sys/ddb/db_command.c:482 #4 0xffffffff8040beed in db_command_loop () at /usr/src/sys/ddb/db_command.c:535 #5 0xffffffff8040f616 in db_trap (type=, code=) at /usr/src/sys/ddb/db_main.c:270 #6 0xffffffff8066b1c4 in kdb_trap (type=type@entry=3, code=code@entry=0, tf=, tf@entry=0xfffffe00c5f397f0) at /usr/src/sys/kern/subr_kdb.c:727 #7 0xffffffff809a4e96 in trap (frame=0xfffffe00c5f397f0) at /usr/src/sys/amd64/amd64/trap.c:604 #8 #9 kdb_enter (why=0xffffffff80a61a23 "panic", msg=) at /usr/src/sys/kern/subr_kdb.c:506 #10 0xffffffff806207a2 in vpanic (fmt=, ap=, ap@entry=0xfffffe00c5f39950) at /usr/src/sys/kern/kern_shutdown.c:907 #11 0xffffffff80620533 in panic ( fmt=0xffffffff80d635c8 ".\024\244\200\377\377\377\377") at /usr/src/sys/kern/kern_shutdown.c:843 #12 0xffffffff808e12b1 in uma_dbg_free (zone=0xfffffe00dcbdd800, slab=0xfffff800356b9fd8, item=0xfffff800356b9000) at /usr/src/sys/vm/uma_core.c:5664 #13 0xffffffff808d9de7 in item_dtor (zone=0xfffffe00dcbdd800, item=0xfffff800356b9000, size=544, udata=0x0, skip=SKIP_NONE) at /usr/src/sys/vm/uma_core.c:3418 #14 uma_zfree_arg (zone=0xfffffe00dcbdd800, item=0xfffff800356b9000, udata=udata@entry=0x0) at /usr/src/sys/vm/uma_core.c:4374 #15 0xffffffff802da503 in uma_zfree (zone=0xffffffff80d635c8 , item=0x200) at /usr/src/sys/vm/uma.h:404 #16 0xffffffff802d9117 in camperiphdone (periph=0xfffff800061e2c00, done_ccb=0xfffff800355d6cc0) at /usr/src/sys/cam/cam_periph.c:1427 #17 0xffffffff802dfebd in xpt_done_process (ccb_h=0xfffff800355d6cc0) at /usr/src/sys/cam/cam_xpt.c:5491 #18 0xffffffff802e1ec5 in xpt_done_td ( arg=arg@entry=0xffffffff80d33d80 ) at /usr/src/sys/cam/cam_xpt.c:5546 #19 0xffffffff805dad80 in fork_exit (callout=0xffffffff802e1dd0 , arg=0xffffffff80d33d80 , frame=0xfffffe00c5f39c00) at /usr/src/sys/kern/kern_fork.c:1083 #20 Apparently caused by recent changes to CAM. Let me know if you want more information. -- Gary Jennejohn