Re: panic: data abort in critical section or under mutex (was: Re: panic: Unknown kernel exception 0 esr_el1 2000000 (on 14-CURRENT/aarch64 Feb 28))
Date: Mon, 07 Mar 2022 10:38:59 UTC
Yes, I spoke to soon too. Often it crashes as soon as I start a parallel poudriere build. But this time it went very far. As soon as nightly backups kicked in it was game over again.
I had read the mail of Bob on the arm@ ML. But I wanted to let the conclusion that it is about the same problem to the developers. (Have seen enough of wrong guessing of causes in my work. 😉)
I will need to go further into the binary search of working kernels.
This was: FreeBSD 14.0-CURRENT #0 912df91: Wed Mar 2 00:36:35 UTC 2022
Fatal data abort:
x0: ffff000000f1efd8 x0: ffff000000f1efd8 (mac_policy_rm + 0) (mac_policy_rm + 0)
x1: 2 x1: 2
x2: ffff00000087dcf2 x2: ffff00000087dcf2 (cam_status_table + 2f28a)
(cam_status_table + 2f28a) x3: ffff00000087dcf2
x3: ffff00000087dcf2 (cam_status_table + 2f28a) (cam_status_table + 2f28a)
x4: 102 x4: 102
x5: 7 x5: 1
x6: 0 x6: ff
x7: 0 x7: ffffa00011fc2800
x8: 1
x8: 1 x9: ffff000000f37c10
x9: ffff0000419d9090 (pcpu0 + 90) (g_ctx + 40278fe4)
x10: ffffa0017be2a600 x10: ffffa000010fa600
x11: 394aed08d0003a48
x12: 350001a8b946a108 x11: 0
x12: ffff000000f37c10 x13: badecce4 (pcpu0 + 90)
x13: ffffa0001fbde6b0 x14: 0
x14: 4965ae49 x15: 1
x15: 1000193 x16: ffff0000016a4238
x16: ffff000100482d38 (__stop_set_modmetadata_set + d00) (__stop_set_modmetadata_set + 448)
x17: ffff00000044a998 x17: ffff00000058ff30 (free + 0) (if_inc_counter + 0)
x18: ffff0000b49a23c0 x18: ffff000103f11b80 (g_ctx + b3242314)
(next_index + 3a228c0) x19: 102
x19: 102 x20: ffff0000b49a2428
x20: ffff000103f11be8 (g_ctx + b324237c) (next_index + 3a22928)
x21: ffff00000087dcf2 x21: ffff00000087dcf2 (cam_status_table + 2f28a) (cam_status_table + 2f28a)
x22: ffff000000f1efd8 x22: ffff000000f1efd8 (mac_policy_rm + 0) (mac_policy_rm + 0)
x23: ffff00000086f107 x23: 0 (cam_status_table + 2069f)
x24: ffffa0001fbde6c8 x24: ffffa0008cba0d00
x25: 0
x25: ffff00000088aa11 x26: 4 (do_execve.fexecv_proc_title + 76b7)
x27: 0 x26: ffffa0017be2a600
x28: ffff00010209fcf0
x27: ffffa00025626a80 (next_index + 1bb0a30)
x28: ffff000103f11ce0 x29: ffff0000b49a23e0 (next_index + 3a22a20) (g_ctx + b3242334)
x29: ffff000103f11ba0 sp: ffff0000b49a23c0
(next_index + 3a228e0) lr: ffff00000046ef98
sp: ffff000103f11b80
(_rm_runlock_debug + 60) lr: ffff00000046ef98
elr: ffff00000046dc0c (_rm_runlock_debug + 60) (_rm_assert + a4)
elr: ffff00000046dc0cspsr: 45
(_rm_assert + a4) far: 10
esr: 96000004
spsr: 45
panic: data abort in critical section or under mutex
cpuid = 1
time = 1646609483
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
data_abort() at data_abort+0x2d4
handle_el1h_sync() at handle_el1h_sync+0x10
--- exception, esr 0x96000004
_rm_assert() at _rm_assert+0xa4
_rm_runlock_debug() at _rm_runlock_debug+0x5c
mac_inpcb_check_deliver() at mac_inpcb_check_deliver+0x74
tcp_input_with_port() at tcp_input_with_port+0xab4
tcp_input() at tcp_input+0xc
ip_input() at ip_input+0x2e8
netisr_dispatch_src() at netisr_dispatch_src+0xe4
ether_demux() at ether_demux+0x178
ether_nh_input() at ether_nh_input+0x3e8
netisr_dispatch_src() at netisr_dispatch_src+0xe4
ether_input() at ether_input+0x80
if_input() at if_input+0xc
gen_intr() at gen_intr+0x444
ithread_loop() at ithread_loop+0x2a0
fork_exit() at fork_exit+0x74
fork_trampoline() at fork_trampoline+0x14
KDB: enter: panic
[ thread pid 12 tid 100063 ]
Stopped at kdb_enter+0x44: undefined f902011f
db>
NB: db> reboot/reset/halt does not work on my RPI4. Luckily I have a wifi connected power switch on it.
Regards,
Ronald.
Van: Mark Millard <marklmi@yahoo.com>
Datum: maandag, 7 maart 2022 02:01
Aan: Ronald Klop <ronald-lists@klop.ws>
CC: freebsd-current <freebsd-current@freebsd.org>, bob prohaska <fbsd@www.zefox.net>
Onderwerp: Re: panic: data abort in critical section or under mutex (was: Re: panic: Unknown kernel exception 0 esr_el1 2000000 (on 14-CURRENT/aarch64 Feb 28))
>
> From: Ronald Klop <ronald-lists_at_klop.ws> wrote on
> Date: Sun, 6 Mar 2022 23:22:42 +0100 (CET) :
>
> > Did some binary search with kernels from artifact.ci.freebsd.org.
> >
> > I suspect "rmlock: Micro-optimize read locking" as cause.
> >
> > https://cgit.freebsd.org/src/commit/?id=c84bb8cd771ce4bed58152e47a32dda470bef23a
> >
> >
> > And "rmlock: Add required compiler barriers to _rm_runlock()" as solution.
> >
> > https://cgit.freebsd.org/src/commit/?id=89ae8eb74e87ac19aa2d7abe4ba16bcccd32bb9f
> >
> >
> > So I probably just had a bad day.
>
> Well, there is a report of a buildkernel crash after that pair:
>
> https://lists.freebsd.org/archives/freebsd-arm/2022-March/001078.html
>
> that references additional information at:
>
> http://www.zefox.net/~fbsd/rpi3/crashes/20220304/readme
>
> and reported:
>
> QUOTE
> The console connection dropped before the crash (unrelated) I didn't
> get the preamble, all I have is the backtrace and buildkernel log.
> Here's the backtrace:
> db> bt
> Tracing pid 14795 tid 100098 td 0xffffa00017815600
> db_trace_self() at db_trace_self
> db_stack_trace() at db_stack_trace+0x11c
> db_command() at db_command+0x368
> db_command_loop() at db_command_loop+0x54
> db_trap() at db_trap+0xf8
> kdb_trap() at kdb_trap+0x1cc
> handle_el1h_sync() at handle_el1h_sync+0x10
> --- exception, esr 0xf2000000
> kdb_enter() at kdb_enter+0x44
> vpanic() at vpanic+0x1b0
> panic() at panic+0x44
> data_abort() at data_abort+0x2e8
> handle_el1h_sync() at handle_el1h_sync+0x10
> --- exception, esr 0x96000004
> _rm_rlock_debug() at _rm_rlock_debug+0x8c
> sysctl_root_handler_locked() at sysctl_root_handler_locked+0x140
> sysctl_root() at sysctl_root+0x1ac
> userland_sysctl() at userland_sysctl+0x140
> sys___sysctl() at sys___sysctl+0x68
> do_el0_sync() at do_el0_sync+0x520
> handle_el0_sync() at handle_el0_sync+0x40
> --- exception, esr 0x56000000
> END QUOTE
>
> The above material does reference _rm_rlock_debug . Might be
> related?
>
> The readme reports:
>
> main-n253603-0b25cbc79d3: Thu Mar 3 22:48:31 PST 2022
>
> for the system doing the buildkernel. This is after
> 89ae8eb74e8 .
>
> (It also mentions another panic earlier in the week,
> apparently not reported to the lists at the time.)
>
> ===
> Mark Millard
> marklmi at yahoo.com
>
>
>
>