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Date:      Wed, 25 Nov 2020 15:35:55 +0000
From:      bugzilla-noreply@freebsd.org
To:        bugs@FreeBSD.org
Subject:   [Bug 251274] panic: recursive fpu_kern_enter while in PCB_FPUNOSAVE state
Message-ID:  <bug-251274-227-oHmXPxcdik@https.bugs.freebsd.org/bugzilla/>
In-Reply-To: <bug-251274-227@https.bugs.freebsd.org/bugzilla/>
References:  <bug-251274-227@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D251274

--- Comment #2 from Juraj Lutter <juraj@lutter.sk> ---
With today's CURRENT and openzfs (sysutils/openzfs-kmod) I'm getting:

nda21: 1526185MB (3125627568 512 byte sectors)


Fatal trap 12: page fault while in kernel mode
cpuid =3D 27; apic id =3D 1b
fault virtual address   =3D 0x58
fault code              =3D supervisor read data, page not present
instruction pointer     =3D 0x20:0xffffffff80bc1f09
stack pointer           =3D 0x28:0xfffffe01a3f59b80
frame pointer           =3D 0x28:0xfffffe01a3f59bc0
code segment            =3D base 0x0, limit 0xfffff, type 0x1b
                        =3D DPL 0, pres 1, long 1, def32 0, gran 1
processor eflags        =3D interrupt enabled, resume, IOPL =3D 0
current process         =3D 1 (kernel)
trap number             =3D 12
panic: page fault
cpuid =3D 27
time =3D 115
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xfffffe01a3f59=
830
vpanic() at vpanic+0x181/frame 0xfffffe01a3f59880
panic() at panic+0x43/frame 0xfffffe01a3f598e0
trap_fatal() at trap_fatal+0x387/frame 0xfffffe01a3f59940
trap_pfault() at trap_pfault+0x97/frame 0xfffffe01a3f599a0
trap() at trap+0x2ab/frame 0xfffffe01a3f59ab0
calltrap() at calltrap+0x8/frame 0xfffffe01a3f59ab0
--- trap 0xc, rip =3D 0xffffffff80bc1f09, rsp =3D 0xfffffe01a3f59b80, rbp =
=3D
0xfffffe01a3f59bc0 ---
__mtx_lock_flags() at __mtx_lock_flags+0x49/frame 0xfffffe01a3f59bc0
zone_dataset_visible() at zone_dataset_visible+0x6b/frame 0xfffffe01a3f59c10
zfs_mount() at zfs_mount+0x26c/frame 0xfffffe01a3f59d90
vfs_domount() at vfs_domount+0x89c/frame 0xfffffe01a3f5a000
vfs_donmount() at vfs_donmount+0x872/frame 0xfffffe01a3f5a0a0
kernel_mount() at kernel_mount+0x57/frame 0xfffffe01a3f5a0f0
parse_mount() at parse_mount+0x4a1/frame 0xfffffe01a3f5a230
vfs_mountroot() at vfs_mountroot+0x589/frame 0xfffffe01a3f5a3a0
start_init() at start_init+0x1f/frame 0xfffffe01a3f5a430
fork_exit() at fork_exit+0x80/frame 0xfffffe01a3f5a470
fork_trampoline() at fork_trampoline+0xe/frame 0xfffffe01a3f5a470
--- trap 0, rip =3D 0, rsp =3D 0, rbp =3D 0 ---
KDB: enter: panic
[ thread pid 1 tid 100002 ]
Stopped at      kdb_enter+0x37: movq    $0,0x10ac246(%rip)

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