[Bug 271300] kernel panics when using linux module (mutex umtxql not owned / recursed on non-recursive mutex)

From: <bugzilla-noreply_at_freebsd.org>
Date: Sun, 07 May 2023 16:55:49 UTC 
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=271300

            Bug ID: 271300
           Summary: kernel panics when using linux module (mutex umtxql
                    not owned / recursed on non-recursive mutex)
           Product: Base System
           Version: CURRENT
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: bcran@FreeBSD.org

Created attachment 242039
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=242039&action=edit
dmesg from a dual-EPYC PowerEdge R7525

I'm getting a couple of panics in the linux_sys_futex code when using the VS
Code Remote SSH extension from my Linux machine to my FreeBSD 14-CURRENT
PowerEdge R7525 system.
I've attached the dmesg.


FreeBSD maxamd 14.0-CURRENT FreeBSD 14.0-CURRENT #3
main-n262792-7e0f8b79b773-dirty: Sun May  7 07:58:16 MDT 2023    
bcran@maxamd:/usr/obj/usr/src/amd64.amd64/sys/GENERIC amd64


First is "mutex umtxql not owned":

root@maxamd:/var/crash # kgdb -n 0
...
Unread portion of the kernel message buffer:
panic: mutex umtxql not owned at /usr/src/sys/kern/kern_umtx.c:510
cpuid = 136
time = 1683471469
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xfffffe0416344c40
vpanic() at vpanic+0x152/frame 0xfffffe0416344c90
panic() at panic+0x43/frame 0xfffffe0416344cf0
__mtx_assert() at __mtx_assert+0xa0/frame 0xfffffe0416344d00
umtxq_remove_queue() at umtxq_remove_queue+0x4a/frame 0xfffffe0416344d30
linux_sys_futex() at linux_sys_futex+0x5ae/frame 0xfffffe0416344e00
amd64_syscall() at amd64_syscall+0x140/frame 0xfffffe0416344f30
fast_syscall_common() at fast_syscall_common+0xf8/frame 0xfffffe0416344f30
--- syscall (202, Linux ELF64, linux_sys_futex), rip = 0x801e0bde2, rsp =
0xc86803da0, rbp = 0x168ed58 ---
KDB: enter: panic
Uptime: 56m5s
Dumping 9776 out of 260660 MB:..1%..11%..21%..31%..41%..51%..61%..71%..81%..91%

__curthread () at /usr/src/sys/amd64/include/pcpu_aux.h:59
59              __asm("movq %%gs:%P1,%0" : "=r" (td) : "n" (offsetof(struct
pcpu,


--------------------------------------------
Second is "_mtx_lock_sleep: recursed on non-recursive mutex umtxql"

Unread portion of the kernel message buffer:
panic: _mtx_lock_sleep: recursed on non-recursive mutex umtxql @
/usr/src/sys/compat/linux/linux_futex.c:718

cpuid = 196
time = 1683477614
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xfffffe04ba90bba0
vpanic() at vpanic+0x152/frame 0xfffffe04ba90bbf0
panic() at panic+0x43/frame 0xfffffe04ba90bc50
__mtx_lock_sleep() at __mtx_lock_sleep+0x41f/frame 0xfffffe04ba90bce0
__mtx_lock_flags() at __mtx_lock_flags+0xe9/frame 0xfffffe04ba90bd30
linux_sys_futex() at linux_sys_futex+0x6c5/frame 0xfffffe04ba90be00
amd64_syscall() at amd64_syscall+0x140/frame 0xfffffe04ba90bf30
fast_syscall_common() at fast_syscall_common+0xf8/frame 0xfffffe04ba90bf30
--- syscall (202, Linux ELF64, linux_sys_futex), rip = 0x80160c1ee, rsp =
0xc8d801c08, rbp = 0 ---
KDB: enter: panic
Uptime: 5m8s
Dumping 9500 out of 260660 MB:..1%..11%..21%..31%..41%..51%..61%..71%..81%..91%

__curthread () at /usr/src/sys/amd64/include/pcpu_aux.h:59
59              __asm("movq %%gs:%P1,%0" : "=r" (td) : "n" (offsetof(struct
pcpu,

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