[Bug 261166] LinuxKPI kernel panics: mi _switch: switch in a critical section – 14. 0-CURRENT main-n252381-75d20a5e386 (2022-01-1 1)

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=261166

--- Comment #12 from commit-hook@FreeBSD.org ---
A commit in branch main references this bug:

URL:
https://cgit.FreeBSD.org/src/commit/?id=89889ab470b9f1a1cd36913dd219b78efbf484df

commit 89889ab470b9f1a1cd36913dd219b78efbf484df
Author:     Vladimir Kondratyev <wulf@FreeBSD.org>
AuthorDate: 2022-01-18 20:14:13 +0000
Commit:     Vladimir Kondratyev <wulf@FreeBSD.org>
CommitDate: 2022-01-18 20:14:13 +0000

    LinuxKPI: Allow wake_up to be executed within a critical section

    by replaceing of spin_lock() call with spin_lock_irqsave()

    This fixes following panic in drm-kmod:

    panic: mi_switch: switch in a critical section
    cpuid = 2
    time = 1636939794
    KDB: stack backtrace:
    db_trace_self_wrapper() at db_trace_self_wrapper+0x2b
    vpanic() at vpanic+0x187
    panic() at panic+0x43
    mi_switch() at mi_switch+0x198
    __mtx_lock_sleep() at __mtx_lock_sleep+0x1c9
    __mtx_lock_flags() at __mtx_lock_flags+0xa2
    linux_wake_up() at linux_wake_up+0x38
    __active_retire() at __active_retire+0xb7
    dma_fence_signal() at dma_fence_signal+0x100
    dma_resv_add_shared_fence() at dma_resv_add_shared_fence+0x96
    i915_gem_do_execbuffer() at i915_gem_do_execbuffer+0x11d0
    i915_gem_execbuffer2_ioctl() at i915_gem_execbuffer2_ioctl+0x19a
    drm_ioctl_kernel() at drm_ioctl_kernel+0x72
    drm_ioctl() at drm_ioctl+0x2c4
    linux_file_ioctl() at linux_file_ioctl+0x297
    kern_ioctl() at kern_ioctl+0x1dc
    sys_ioctl() at sys_ioctl+0x124
    amd64_syscall() at amd64_syscall+0x124
    fast_syscall_common() at fast_syscall_common+0xf8
    --- syscall (54, FreeBSD ELF64, sys_ioctl)

    MFC after:      1 week
    Reviewed by:    manu
    Reported by:    Graham Perrin <grahamperrin_AT_gmail_DOT_com>
    PR:             261166
    Differential Revision:  https://reviews.freebsd.org/D33888

 sys/compat/linuxkpi/common/src/linux_schedule.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

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