Re: "panic: malloc(M_WAITOK) in non-sleepable context" after r364296 -> r364341

see https://reviews.freebsd.org/D26027

On 8/18/20, David Wolfskill <david_at_catwhisker.org> wrote:
> Just did a src update from r364296 -> r364341 on amd64 on my bild
> machine (laptop is still working -- it built firefox earlier, which
> takes some time).  On initial reboot, the build machine panicked:
>
> umass0:  SCSI over Bulk-Only; quirks = 0x4000
> umass0:6:0: Attached to scbus6
> (probe0:umass-sim0:0:0:0): Down reving Protocol Version from 2 to 0?
> panic: malloc(M_WAITOK) in non-sleepable context
> cpuid = 1
> time = 20
> KDB: stack backtrace:
> db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame
> 0xffffffff8218d440
> vpanic() at vpanic+0x182/frame 0xffffffff8218d490
> panic() at panic+0x43/frame 0xffffffff8218d4f0
> malloc() at malloc+0x20c/frame 0xffffffff8218d540
> devfs_alloc() at devfs_alloc+0x28/frame 0xffffffff8218d570
> make_dev_sv() at make_dev_sv+0x97/frame 0xffffffff8218d600
> make_dev_s() at make_dev_s+0x3b/frame 0xffffffff8218d660
> passregister() at passregister+0x3e7/frame 0xffffffff8218d8b0
> cam_periph_alloc() at cam_periph_alloc+0x57b/frame 0xffffffff8218d980
> passasync() at passasync+0x5c/frame 0xffffffff8218d9c0
> xpt_async_process_dev() at xpt_async_process_dev+0x152/frame
> 0xffffffff8218da10
> xpt_async_process() at xpt_async_process+0x334/frame 0xffffffff8218db20
> xpt_done_process() at xpt_done_process+0x3a3/frame 0xffffffff8218db60
> xpt_done_td() at xpt_done_td+0xf5/frame 0xffffffff8218dbb0
> fork_exit() at fork_exit+0x80/frame 0xffffffff8218dbf0
> fork_trampoline() at fork_trampoline+0xe/frame 0xffffffff8218dbf0
> --- trap 0, rip = 0, rsp = 0, rbp = 0 ---
> KDB: enter: panic
> [ thread pid 16 tid 100068 ]
> Stopped at      kdb_enter+0x37: movq    $0,0x10b70f6(%rip)
> db>
>
>
> So -- it's at the debugger prompt; given sufficient hints, I'm happy
> to poke at it & report back.
>
> Yesterday's (r364296) verbose dmesg.boot is at
> http://www.catwhisker.org/~david/FreeBSD/history/freebeast.13_dmesg.txt
> (in case that's useful).
>
> Peace,
> david
> --
> David H. Wolfskill				david_at_catwhisker.org
> Donald Trump is either ignorant of how to govern or is refusing to do so.
>
> See http://www.catwhisker.org/~david/publickey.gpg for my public key.
>


-- 
Mateusz Guzik <mjguzik gmail.com>