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Date:      Fri, 17 Jul 2020 14:37:21 +0000
From:      bugzilla-noreply@freebsd.org
To:        bugs@FreeBSD.org
Subject:   [Bug 248046] Panic when creating a bridge interface
Message-ID:  <bug-248046-227@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D248046

            Bug ID: 248046
           Summary: Panic when creating a bridge interface
           Product: Base System
           Version: 12.1-STABLE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: freqlabs@FreeBSD.org

This was also reported on freebsd-stable as "Kernel panic on recent 12.1 on
bridge creation."

Tested on a kernel built with INVARIANTS, on
FreeBSD-12.1-STABLE-amd64-20200709-r363017-disc1.iso

Repro: ifconfig bridge create

Unread portion of the kernel message buffer:
panic: malloc(M_WAITOK) in epoch context
cpuid =3D 1
time =3D 1594992085
KDB: stack backtrace:
#0 0xffffffff80bda5b5 at kdb_backtrace+0x65
#1 0xffffffff80b934ab at vpanic+0x17b
#2 0xffffffff80b932b3 at panic+0x43
#3 0xffffffff80b6e414 at malloc_dbg+0xd4
#4 0xffffffff80b6e1c1 at malloc+0x21
#5 0xffffffff82a16b69 at bridge_ioctl_gifs+0xb9
#6 0xffffffff82a1845b at bridge_ioctl+0x32b
#7 0xffffffff80c893ea at ifioctl+0x9ea
#8 0xffffffff80bf93d5 at kern_ioctl+0x2d5
#9 0xffffffff80bf9057 at sys_ioctl+0x127
#10 0xffffffff81055874 at amd64_syscall+0x2a4
#11 0xffffffff8102c880 at fast_syscall_common+0x101

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