Re: kernel trap 12 .. cam_periph_release_locked_buses() panics under panic?

Reply: Bjoern A. Zeeb: "Re: kernel trap 12 .. cam_periph_release_locked_buses() panics under panic?"
In reply to: Bjoern A. Zeeb: "kernel trap 12 .. cam_periph_release_locked_buses() panics under panic?"
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From: Warner Losh <imp_at_bsdimp.com>
Date: Mon, 11 Sep 2023 14:18:36 UTC
That's a crazy traceback. We get a fatal trap and then call into the wifi
stack? That makes no sense in the absence of some crazy data corruption or
a weird traceback issue.

On Mon, Sep 11, 2023, 7:47 AM Bjoern A. Zeeb <bzeeb-lists@lists.zabbadoz.net>
wrote:

> Hi,
>
> had a kernel hitting an alll-to-known wifi issue and panic (I was actually
> happy I could reproduce) and then the screen kept scrolling for a while
> panicing all over again and ddb was unusable (not so happy).
>
> I assume the problem is cam_periph_release_locked_buses()?
>

Unlikely given the rest of the traceback....

Can you get a core so we can look at it more deeply?

Warner


> /bz
>
> ...
> --- trap 0x80bc1f07, rip = 0xffffffff80381e83, rsp = 0x3d7bb6db69f8, rbp =
> 0xfffffe00907fa4a0 ---
> cam_periph_release_locked_buses() at
> cam_periph_release_locked_buses+0x43/frame 0xfffffe00907fa4a0
> kernel trap 12 with interrupts disabled
>
>
> Fatal trap 12: page fault while in kernel mode
> cpuid = 2; apic id = 02
> fault virtual address   = 0xfffffe00907fa4a8
> fault code              = supervisor read data, page not present
> instruction pointer     = 0x20:0xffffffff8101f660
> stack pointer           = 0x0:0xfffffe00907f8f90
> frame pointer           = 0x0:0xfffffe00907f9020
> code segment            = base 0x0, limit 0xfffff, type 0x1b
>                          = DPL 0, pres 1, long 1, def32 0, gran 1
> processor eflags        = resume, IOPL = 0
> current process         = 0 (iwlwifi0 net80211 t)
> rdi: fffffe00907f8f90 rsi: 0000000000000008 rdx: fffffe00907fa4a8
> rcx: fffffe00907f9030  r8: 0000000000000000  r9: 0000000000000000
> rax: 0000000000000000 rbx: fffffe00907f90f0 rbp: fffffe00907f9020
> r10: 0000000000000000 r11: 0000000000000000 r12: fffffe00907fa4a8
> r13: 0000000000000008 r14: 0000000000000000 r15: fffffe00907f9030
> trap number             = 12
> panic: page fault
> cpuid = 2
> time = 1694439681
> KDB: stack backtrace:
> db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame
> 0xfffffe00907f8c60
> vpanic() at vpanic+0x132/frame 0xfffffe00907f8d90
> panic() at panic+0x43/frame 0xfffffe00907f8df0
> trap_fatal() at trap_fatal+0x40c/frame 0xfffffe00907f8e50
> trap_pfault() at trap_pfault+0xae/frame 0xfffffe00907f8ec0
> calltrap() at calltrap+0x8/frame 0xfffffe00907f8ec0
> --- trap 0xc, rip = 0xffffffff8101f660, rsp = 0xfffffe00907f8f90, rbp =
> 0xfffffe00907f9020 ---
> db_read_bytes() at db_read_bytes+0xa0/frame 0xfffffe00907f9020
> db_get_value() at db_get_value+0x31/frame 0xfffffe00907f9060
> db_backtrace() at db_backtrace+0x1d9/frame 0xfffffe00907f90e0
> db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame
> 0xfffffe00907f9160
> vpanic() at vpanic+0x132/frame 0xfffffe00907f9290
> panic() at panic+0x43/frame 0xfffffe00907f92f0
> trap_fatal() at trap_fatal+0x40c/frame 0xfffffe00907f9350
> trap_pfault() at trap_pfault+0xae/frame 0xfffffe00907f93c0
> calltrap() at calltrap+0x8/frame 0xfffffe00907f93c0
> --- trap 0xc, rip = 0xffffffff8101f660, rsp = 0xfffffe00907f9490, rbp =
> 0xfffffe00907f9520 ---
> db_read_bytes() at db_read_bytes+0xa0/frame 0xfffffe00907f9520
> db_get_value() at db_get_value+0x31/frame 0xfffffe00907f9560
> db_backtrace() at db_backtrace+0x1d9/frame 0xfffffe00907f95e0
> db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame
> 0xfffffe00907f9660
> vpanic() at vpanic+0x132/frame 0xfffffe00907f9790
> panic() at panic+0x43/frame 0xfffffe00907f97f0
> trap_fatal() at trap_fatal+0x40c/frame 0xfffffe00907f9850
> trap_pfault() at trap_pfault+0xae/frame 0xfffffe00907f98c0
> calltrap() at calltrap+0x8/frame 0xfffffe00907f98c0
> --- trap 0xc, rip = 0xffffffff8101f660, rsp = 0xfffffe00907f9990, rbp =
> 0xfffffe00907f9a20 ---
> db_read_bytes() at db_read_bytes+0xa0/frame 0xfffffe00907f9a20
> db_get_value() at db_get_value+0x31/frame 0xfffffe00907f9a60
> db_backtrace() at db_backtrace+0x1d9/frame 0xfffffe00907f9ae0
> db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame
> 0xfffffe00907f9b60
> vpanic() at vpanic+0x132/frame 0xfffffe00907f9c90
> panic() at panic+0x43/frame 0xfffffe00907f9cf0
> lkpi_sta_auth_to_scan() at lkpi_sta_auth_to_scan+0x388/frame
> 0xfffffe00907f9d70
> lkpi_iv_newstate() at lkpi_iv_newstate+0x2eb/frame 0xfffffe00907f9df0
> ieee80211_newstate_cb() at ieee80211_newstate_cb+0x1e7/frame
> 0xfffffe00907f9e40
> taskqueue_run_locked() at taskqueue_run_locked+0xab/frame
> 0xfffffe00907f9ec0
> taskqueue_thread_loop() at taskqueue_thread_loop+0xd3/frame
> 0xfffffe00907f9ef0
> fork_exit() at fork_exit+0x82/frame 0xfffffe00907f9f30
> fork_trampoline() at fork_trampoline+0xe/frame 0xfffffe00907f9f30
> --- trap 0x80bc1f07, rip = 0xffffffff80381e83, rsp = 0x3d7bb6db69f8, rbp =
> 0xfffffe00907fa4a0 ---
> cam_periph_release_locked_buses() at
> cam_periph_release_locked_buses+0x43/frame 0xfffffe00907fa4a0
> kernel trap 12 with interrupts disabled
> ...
>
> --
> Bjoern A. Zeeb                                                     r15:7
>
>