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Date:      Sat, 5 Mar 2022 12:16:04 +0100 (CET)
From:      Ronald Klop <ronald-lists@klop.ws>
To:        FreeBSD Current <freebsd-current@freebsd.org>
Subject:   panic: Unknown kernel exception 0 esr_el1 2000000 (on 14-CURRENT/aarch64 Feb 28)
Message-ID:  <1716388080.66.1646478964882@mailrelay>
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Hi,

Repeated panics on 14-CURRENT/aarch64. This happens e.g. when the nigthly backup is started.
# uname -a
FreeBSD rpi4 14.0-CURRENT FreeBSD 14.0-CURRENT #22 main-5f702d6d9a: Mon Feb 28 06:12:48 CET 2022     ronald@rpi4:/home/ronald/dev/obj/home/ronald/dev/freebsd/arm64.aarch64/sys/GENERIC-NODEBUG arm64

It was stable with all kernels until (and including) "FreeBSD 14.0-CURRENT #21 main-e11ad014d1-dirty: Sat Feb  5 00:09:08 CET 2022".

It runs ZFS-on-root via an USB disk. No other FS involved.
# gpart show
=>        40  1953458096  da0  GPT  (931G)
          40      102400    1  efi  (50M)
      102440     8388608    2  freebsd-swap  (4.0G)
     8491048  1944967088    3  freebsd-zfs  (927G)


Output on serial console:
x0: ffffa000059c1380                                                                                                       
  x1: ffffa000059b1600                                                                                                              
  x2:                3                                                                                                              
  x3: ffffa001862779a0                                                                                                              
  x4:                0        
  x5:    9438238792a1a
  x6:    d217e9df58308
  x7:               14
  x8: ffffa000059c1398
  x9:                1
 x10: ffffa000059b1600
 x11:                2
 x12:                1
 x13: f2557a42c5b0f240
 x14: 1013e6b85a8ecbe4
 x15:     24f981889f30
 x16: ffff4afedeb89cb8
 x17: fffffffffffffff2
 x18: ffff0000fe666800 (g_ctx + fcfa6a54)
 x19:                0
 x20: ffff0000fec41000 (g_ctx + fd581254)
 x21:                3
 x22: ffff0000419bb090 (g_ctx + 402fb2e4)
 x23: ffff000000c09bb7 (lockstat_enabled + 0)
 x24:              180
 x25: ffff000000c09000 (sdt_vfs_vop_vop_spare1_entry + 28)
 x26: ffff000000c09000 (sdt_vfs_vop_vop_spare1_entry + 28)
 x27: ffff000000c09000 (sdt_vfs_vop_vop_spare1_entry + 28)
 x28:                0
 x29: ffff0000fe666800 (g_ctx + fcfa6a54)
  sp: ffff0000fe666800
  lr: ffff00000154ca38 (zio_dva_throttle + 13c)
 elr: ffff00000154ca80 (zio_dva_throttle + 184)
spsr:         20000045
 far:     1f24979f8000
panic: Unknown kernel exception 0 esr_el1 2000000
cpuid = 2
time = 1646433952
KDB: stack backtrace:
db_trace_self() at db_trace_self
db_trace_self_wrapper() at db_trace_self_wrapper+0x30
vpanic() at vpanic+0x174
panic() at panic+0x44
do_el1h_sync() at do_el1h_sync+0x184
handle_el1h_sync() at handle_el1h_sync+0x10
--- exception, esr 0x2000000
zio_dva_throttle() at zio_dva_throttle+0x184
zio_execute() at zio_execute+0x58
KDB: enter: panic
[ thread pid 0 tid 100128 ]
Stopped at      kdb_enter+0x44: undefined       f901c11f
db>


I'm going to build a newer kernel to see if the problem persists. I can keep the current kernel to reproduce this if needed.

Regards,
Ronald.
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<html><head></head><body>Hi,<br />
<br />
Repeated panics on 14-CURRENT/aarch64. This happens e.g. when the nigthly backup is started.
<pre>
# uname -a
FreeBSD rpi4 14.0-CURRENT FreeBSD 14.0-CURRENT #22 main-5f702d6d9a: Mon Feb 28 06:12:48 CET 2022     ronald@rpi4:/home/ronald/dev/obj/home/ronald/dev/freebsd/arm64.aarch64/sys/GENERIC-NODEBUG arm64</pre>
<br />
It was stable with all kernels until (and including) &quot;FreeBSD 14.0-CURRENT #21 main-e11ad014d1-dirty: Sat Feb&nbsp; 5 00:09:08 CET 2022&quot;.<br />
<br />
It runs ZFS-on-root via an USB disk. No other FS involved.
<pre>
# gpart show
=&gt;        40  1953458096  da0  GPT  (931G)
          40      102400    1  efi  (50M)
      102440     8388608    2  freebsd-swap  (4.0G)
     8491048  1944967088    3  freebsd-zfs  (927G)</pre>
<br />
<br />
Output on serial console:
<pre>
x0: ffffa000059c1380&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;
&nbsp; x1: ffffa000059b1600&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;
&nbsp; x2:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 3&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;
&nbsp; x3: ffffa001862779a0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;
&nbsp; x4:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
&nbsp; x5:&nbsp;&nbsp;&nbsp; 9438238792a1a
&nbsp; x6:&nbsp;&nbsp;&nbsp; d217e9df58308
&nbsp; x7:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 14
&nbsp; x8: ffffa000059c1398
&nbsp; x9:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 1
&nbsp;x10: ffffa000059b1600
&nbsp;x11:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 2
&nbsp;x12:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 1
&nbsp;x13: f2557a42c5b0f240
&nbsp;x14: 1013e6b85a8ecbe4
&nbsp;x15:&nbsp;&nbsp;&nbsp;&nbsp; 24f981889f30
&nbsp;x16: ffff4afedeb89cb8
&nbsp;x17: fffffffffffffff2
&nbsp;x18: ffff0000fe666800 (g_ctx + fcfa6a54)
&nbsp;x19:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0
&nbsp;x20: ffff0000fec41000 (g_ctx + fd581254)
&nbsp;x21:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 3
&nbsp;x22: ffff0000419bb090 (g_ctx + 402fb2e4)
&nbsp;x23: ffff000000c09bb7 (lockstat_enabled + 0)
&nbsp;x24:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 180
&nbsp;x25: ffff000000c09000 (sdt_vfs_vop_vop_spare1_entry + 28)
&nbsp;x26: ffff000000c09000 (sdt_vfs_vop_vop_spare1_entry + 28)
&nbsp;x27: ffff000000c09000 (sdt_vfs_vop_vop_spare1_entry + 28)
&nbsp;x28:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0
&nbsp;x29: ffff0000fe666800 (g_ctx + fcfa6a54)
&nbsp; sp: ffff0000fe666800
&nbsp; lr: ffff00000154ca38 (zio_dva_throttle + 13c)
&nbsp;elr: ffff00000154ca80 (zio_dva_throttle + 184)
spsr:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 20000045
&nbsp;far:&nbsp;&nbsp;&nbsp;&nbsp; 1f24979f8000
panic: Unknown kernel exception 0 esr_el1 2000000
cpuid = 2
time = 1646433952
KDB: stack backtrace:
db_trace_self() at db_trace_self
db_trace_self_wrapper() at db_trace_self_wrapper+0x30
vpanic() at vpanic+0x174
panic() at panic+0x44
do_el1h_sync() at do_el1h_sync+0x184
handle_el1h_sync() at handle_el1h_sync+0x10
--- exception, esr 0x2000000
zio_dva_throttle() at zio_dva_throttle+0x184
zio_execute() at zio_execute+0x58
KDB: enter: panic
[ thread pid 0 tid 100128 ]
Stopped at&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; kdb_enter+0x44: undefined&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; f901c11f
db&gt;

</pre>
I'm going to build a newer kernel to see if the problem persists. I can keep the current kernel to reproduce this if needed.<br />
<br />
Regards,<br />
Ronald.</body></html>
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