[Bug 256934] Panic in ena driver on a t3.large ec2 instance

From: <bugzilla-noreply_at_freebsd.org>
Date: Fri, 02 Jul 2021 07:38:50 UTC

            Bug ID: 256934
           Summary: Panic in ena driver on a t3.large ec2 instance
           Product: Base System
           Version: 13.0-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: ale@FreeBSD.org

The instance has been running fine for years with FreeBSD 12.x.

15 days after upgrading it to FreeBSD 13.0 with freebsd-update I got the
following kernel panic:

spin lock 0xffffffff81ce5e80 (smp rendezvous) held by 0xfffffe008e637000 (tid
100108) too long
panic: spin lock held too long
cpuid = 1
time = 1625166932
KDB: stack backtrace:
#0 0xffffffff80c57515 at kdb_backtrace+0x65
#1 0xffffffff80c09ef1 at vpanic+0x181
#2 0xffffffff80c09d63 at panic+0x43
#3 0xffffffff80be8694 at _mtx_lock_indefinite_check+0x64
#4 0xffffffff80be8245 at _mtx_lock_spin_cookie+0xd5
#5 0xffffffff80c68312 at smp_rendezvous_cpus+0x202
#6 0xffffffff80c6837c at smp_rendezvous+0x2c
#7 0xffffffff8211e734 at ena_keep_alive_wd+0x24
#8 0xffffffff821162e4 at ena_com_aenq_intr_handler+0xc4
#9 0xffffffff80bcb02d at ithread_loop+0x24d
#10 0xffffffff80bc7e2e at fork_exit+0x7e
#11 0xffffffff810629fe at fork_trampoline+0xe
Uptime: 15d7h58m56s

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