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List:       freebsd-hackers
Subject:    Panic in add_route while rebooting in Azure ARM64 bug 272666
From:       Souradeep Chakrabarti <schakrabarti () microsoft ! com>
Date:       2023-08-14 6:05:13
Message-ID: PUZP153MB0788EDFB2D97BCBA886BDA8DCC17A () PUZP153MB0788 ! APCP153 ! PROD ! OUTLOOK ! COM
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Hi,

We are working on bringing FreeBSD on Azure ARM64. Now with recently released FreeBSD \
arm64 preview image in Azure, when doing reboot from serial console, FreeBSD is going \
into panic while coming up. It is happening almost every 2nd, or  3rd attempt. The \
below is the panic.

LF ldconfig path: /lib /usr/lib /usr/lib/compat /usr/local/lib \
                /usr/local/lib/compat/pkg /usr/local/lib/compat/pkg
lo0: link state changed to UP
Kernel page fault with the following non-sleepable locks held:
exclusive rm rib head lock (rib head lock) r = 0 (0xffffa000012278e0) locked @ \
/usr/src/sys/net/route/route_ctl.c:797 stack backtrace:
#0 0xffff0000004d2af4 at witness_debugger+0x5c
#1 0xffff0000004d3cf8 at witness_warn+0x400
#2 0xffff0000007f7310 at data_abort+0xa0
#3 0xffff0000007d3014 at handle_el1h_sync+0x14
  x0: 0x0000000000000001
  x1: 0x0000000000000100
  x2: 0xffffa00001ae7000
  x3: 0xffff00004031af40 ($d.2 + 0x3efee96f)
  x4: 0x0000000000000100
  x5: 0x0000000000000000
  x6: 0x000000000000003f
  x7: 0x0000000000000000
  x8: 0xffff000132c76c40
  x9: 0x0000000000000000
 x10: 0x0000000000000008
 x11: 0x0000000000000000
 x12: 0x000000000000003e
 x13: 0xffffa00001ae70fc
 x14: 0x0000000000000000
 x15: 0x0000000000000001
 x16: 0x0000000000010000
 x17: 0x0000000000000005
 x18: 0xffff00012d2f7e60
 x19: 0xffff00012d2f8080
 x20: 0xffffa00001227800
 x21: 0x0000000000000000
 x22: 0xdeadc0dedeadc0de
 x23: 0xffffa000012278e0
 x24: 0xffffa00001227800
 x25: 0xffffa0000c93ba00
 x26: 0xffff000000960582 (digits + 0x12fbf)
 x27: 0xffffa0000c9338f0
 x28: 0x0000000000000000
 x29: 0xffff00012d2f7e60
  sp: 0xffff00012d2f7e60
  lr: 0xffff0000005bf63c (rib_notify + 0x50)
 elr: 0xffffa0000c93bb00
spsr: 0x0000000060400045
 far: 0xffffa0000c93bb00
 esr: 0x000000008600000e
panic: data abort in critical section or under mutex
cpuid = 3
time = 1690047394
KDB: stack backtrace:
db_trace_self() at db_trace_self
db_trace_self_wrapper() at db_trace_self_wrapper+0x30
vpanic() at vpanic+0x13c
panic() at panic+0x44
data_abort() at data_abort+0x30c
handle_el1h_sync() at handle_el1h_sync+0x14
--- exception, esr 0x8600000e
(null)() at 0xffffa0000c93bb00
add_route() at add_route+0xc4
add_route_flags() at add_route_flags+0x1b0
rib_add_route() at rib_add_route+0x324
ifa_maintain_loopback_route() at ifa_maintain_loopback_route+0xf4
in6_update_ifa() at in6_update_ifa+0x994
in6_ifattach() at in6_ifattach+0x1bc
in6_if_up() at in6_if_up+0x90
if_up() at if_up+0xd8
ifhwioctl() at ifhwioctl+0xb7c
ifioctl() at ifioctl+0x860
kern_ioctl() at kern_ioctl+0x2dc
sys_ioctl() at sys_ioctl+0x118
do_el0_sync() at do_el0_sync+0x520
handle_el0_sync() at handle_el0_sync+0x44
--- exception, esr 0x56000000

It is happening for loopback interface IPv6 address. 
A bug has been opened for the same \
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=272666 Can someone please help me \
here, to debug this issue. This is a blocker for FreeBSD on Azure ARM64.

Thanks
Souradeep 


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