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Date:      Wed, 25 Apr 2018 12:39:47 -0700
From:      Bryan Drewery <bdrewery@FreeBSD.org>
To:        freebsd-current <freebsd-current@freebsd.org>
Subject:   Re: crash on process exit.. current at about r332467
Message-ID:  <8644151e-7dce-1283-e804-93a4b1b7bb0b@FreeBSD.org>
In-Reply-To: <9479e941-39be-e6e2-869e-aac475c5e33a@freebsd.org>
References:  <9479e941-39be-e6e2-869e-aac475c5e33a@freebsd.org>

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From: Bryan Drewery <bdrewery@FreeBSD.org>
To: freebsd-current <freebsd-current@freebsd.org>
Message-ID: <8644151e-7dce-1283-e804-93a4b1b7bb0b@FreeBSD.org>
Subject: Re: crash on process exit.. current at about r332467
References: <9479e941-39be-e6e2-869e-aac475c5e33a@freebsd.org>
In-Reply-To: <9479e941-39be-e6e2-869e-aac475c5e33a@freebsd.org>

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On 4/23/18 7:50 AM, Julian Elischer wrote:
> back trace at:=C2=A0 http://www.freebsd.org/~julian/bob-crash.png
>=20
> If anyone wants to take a look..
>=20
> In the exit syscall, while deallocating a vm object.
>=20
> I haven't see references to a similar crash in the last 10 days or so..=

> But if it rings any bells...
>=20

I just hit this on r332455 and have a dump.

> panic: Bad link elm 0xfffff811cd920e60 prev->next !=3D elm
> cpuid =3D 10
> time =3D 1524682939
> KDB: stack backtrace:
> db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xfffffe23f=
450c3b0
> vpanic() at vpanic+0x18d/frame 0xfffffe23f450c410
> panic() at panic+0x43/frame 0xfffffe23f450c470
> vm_object_destroy() at vm_object_destroy/frame 0xfffffe23f450c4d0
> vm_object_deallocate() at vm_object_deallocate+0x45c/frame 0xfffffe23f4=
50c530
> vm_map_process_deferred() at vm_map_process_deferred+0x99/frame 0xfffff=
e23f450c560
> vm_map_remove() at vm_map_remove+0xc6/frame 0xfffffe23f450c590
> exec_new_vmspace() at exec_new_vmspace+0x185/frame 0xfffffe23f450c5f0
> exec_elf64_imgact() at exec_elf64_imgact+0x8fb/frame 0xfffffe23f450c6e0=

> kern_execve() at kern_execve+0x82c/frame 0xfffffe23f450ca40
> sys_execve() at sys_execve+0x4c/frame 0xfffffe23f450cac0
> amd64_syscall() at amd64_syscall+0x786/frame 0xfffffe23f450cbf0
> fast_syscall_common() at fast_syscall_common+0x101/frame 0xfffffe23f450=
cbf0
> --- syscall (59, FreeBSD ELF64, sys_execve), rip =3D 0x800d7af7a, rsp =3D=
 0x7fffffffbd28, rbp =3D 0x7fffffffbe70 ---



--=20
Regards,
Bryan Drewery


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