[Bug 249150] KCSAN reported race conditions

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=249150

            Bug ID: 249150
           Summary: KCSAN reported race conditions
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: gbe at FreeBSD.org

While running a KCSAN-enabled kernel on a recent -CURRENT (r365373) the kernel
reports the following race conditions or racy access. Please note that these
messages where generated during three boot attempts.

CSan: Racy Access [Cpu0 Write Addr=0xfffffe000852d0c8 Size=4
PC=0xffffffff8119730a<tdq_add>] [Cpu1 Read Addr=0xfffffe000852d0c8 Size=4
PC=0xffffffff81198368<sched_idletd>]
CSan: Racy Access [Cpu0 Write Addr=0xfffff800fee00320 Size=4
PC=0xffffffff8193cb08<lapic_et_start>] [Cpu1 Write Addr=0xfffff800fee00320
Size=4 PC=0xffffffff8193cb08<lapic_et_start>]
CSan: Racy Access [Cpu0 Write Addr=0xffffffff82316a00 Size=8
PC=0xffffffff81167c84<tc_windup>] [Cpu1 Read Addr=0xffffffff82316a00 Size=8
PC=0xffffffff8116633c<binuptime>]
CSan: Racy Access [Cpu1 Write Addr=0xfffff800fee00320 Size=4
PC=0xffffffff8193cb08<lapic_et_start>] [Cpu0 Write Addr=0xfffff800fee00320
Size=4 PC=0xffffffff8193cb08<lapic_et_start>]


CSan: Racy Access [Cpu0 Read Addr=0xffffffff836310c8 Size=4
PC=0xffffffff8119261a<cpu_search_highest>] [Cpu1 Write Addr=0xffffffff836310c8
Size=4 PC=0xffffffff8119730a<tdq_add>]
CSan: Racy Access [Cpu0 Write Addr=0xfffffe0038df5748 Size=4
PC=0xffffffff8116d18e<thread_exit>] [Cpu1 Read Addr=0xfffffe0038df5748 Size=4
PC=0xffffffff811166e9<__mtx_lock_sleep>]
CSan: Racy Access [Cpu0 Write Addr=0xfffff800fee00320 Size=4
PC=0xffffffff8193cb08<lapic_et_start>] [Cpu1 Write Addr=0xfffff80CSan: Racy
Access [Cpu0 Write Addr=0xffffffff82204027 Size=1
PC=0xffffffff8114c508<vpanic>] [Cpu1 Read Addr=0xffffffff82204027 Size=1
PC=0xffffffff817df03a<cpustop_handler>]


CSan: Racy Access [Cpu0 Write Addr=0xfffff800fee00380 Size=4
PC=0xffffffff8193cb61<lapic_et_start>] [Cpu1 Write Addr=0xfffff800fee00380
Size=4 PC=0xffffffff8193cb61<lapic_et_start>]
CSan: Racy Access [Cpu1 Write Addr=0xffffffff823167a8 Size=8
PC=0xffffffff81167c71<tc_windup>] [Cpu0 Read Addr=0xffffffff823167a8 Size=8
PC=0xffffffff81168732<cpu_tick_calibration>]
CSan: Racy Access [Cpu1 Write Addr=0xfffff800fee00320 Size=4
PC=0xffffffff8193cb08<lapic_et_start>] [Cpu0 Write Addr=0xfffff800fee00320
Size=4 PC=0xffffffff8193cb08<lapic_et_start>]

CSan: Racy Access [Cpu1 Write Addr=0xfffff800fee000b0 Size=4
PC=0xffffffff8193a170<native_lapic_eoi>] [Cpu0 Write Addr=0xfffff800fee000b0
Size=4 PC=0xffffffff8193a170<native_lapic_eoi>]

CSan: Racy Access [Cpu0 Write Addr=0xfffff800fee000b0 Size=4
PC=0xffffffff8193a170<native_lapic_eoi>] [Cpu1 Write Addr=0xfffff800fee000b0
Size=4 PC=0xffffffff8193a170<native_lapic_eoi>]



CSan: Racy Access [Cpu1 Write Addr=0xfffff800f6b219f0 Size=4
PC=0xffffffff811fd34f<witness_lock>] [Cpu0 Write Addr=0xfffff800f6b219f0 Size=4
PC=0xffffffff811fd34f<witness_lock>]
CSan: Racy Access [Cpu0 Write Addr=0xfffff800f6b219f0 Size=4
PC=0xffffffff811fd34f<witness_lock>] [Cpu1 Write Addr=0xfffff800f6b219f0 Size=4
PC=0xffffffff811fd34f<witness_lock>]
CSan: Racy Access [Cpu1 Write Addr=0xfffff800f6b22368 Size=8
PC=0xffffffff811fd33e<witness_lock>] [Cpu0 Write Addr=0xfffff800f6b22368 Size=8
PC=0xffffffff811fd33e<witness_lock>]
CSan: Racy Access [Cpu0 Write Addr=0xfffff800f6b217f0 Size=4
PC=0xffffffff811fd34f<witness_lock>] [Cpu1 Write Addr=0xfffff800f6b217f0 Size=4
PC=0xffffffff811fd34f<witness_lock>]
CSan: Racy Access [Cpu0 Write Addr=0xfffff800f6b217f0 Size=4
PC=0xffffffff811fd34f<witness_lock>] [Cpu1 Write Addr=0xfffff800f6b217f0 Size=4
PC=0xffffffff811fd34f<witness_lock>]
CSan: Racy Access [Cpu0 Write Addr=0xfffff800f6b217f0 Size=4
PC=0xffffffff811fd34f<witness_lock>] [Cpu1 Write Addr=0xfffff800f6b217f0 Size=4
PC=0xffffffff811fd34f<witness_lock>]
CSan: Racy Access [Cpu0 Write Addr=0xfffff800f6b219e8 Size=8
PC=0xffffffff811fd33e<witness_lock>] [Cpu1 Write Addr=0xfffff800f6b219e8 Size=8
PC=0xffffffff811fd33e<witness_lock>]
CSan: Racy Access [Cpu0 Write Addr=0xfffff800f6b219e8 Size=8
PC=0xffffffff811fd33e<witness_lock>] [Cpu1 Write Addr=0xfffff800f6b219e8 Size=8
PC=0xffffffff811fd33e<witness_lock>]
CSan: Racy Access [Cpu1 Write Addr=0xfffff800f6b219e8 Size=8
PC=0xffffffff811fd33e<witness_lock>] [Cpu0 Write Addr=0xfffff800f6b219e8 Size=8
PC=0xffffffff811fd33e<witness_lock>]
CSan: Racy Access [Cpu0 Write Addr=0xfffff800f6b219e8 Size=8
PC=0xffffffff811fd33e<witness_lock>] [Cpu1 Write Addr=0xfffff800f6b219e8 Size=8
PC=0xffffffff811fd33e<witness_lock>]
CSan: Racy Access [Cpu0 Write Addr=0xfffff800f6b219f0 Size=4
PC=0xffffffff811fd34f<witness_lock>] [Cpu1 Write Addr=0xfffff800f6b219f0 Size=4
PC=0xffffffff811fd34f<witness_lock>]
CSan: Racy Access [Cpu0 Write Addr=0xfffff800f6b219f0 Size=4
PC=0xffffffff811fd34f<witness_lock>] [Cpu1 Write Addr=0xfffff800f6b219f0 Size=4
PC=0xffffffff811fd34f<witness_lock>]
CSan: Racy Access [Cpu0 Write Addr=0xfffff800f6b217e8 Size=8
PC=0xffffffff811fd33e<witness_lock>] [Cpu1 Write Addr=0xfffff800f6b217e8 Size=8
PC=0xffffffff811fd33e<witness_lock>]
CSan: Racy Access [Cpu0 Write Addr=0xfffff800f6b219f0 Size=4
PC=0xffffffff811fd34f<witness_lock>] [Cpu1 Write Addr=0xfffff800f6b219f0 Size=4
PC=0xffffffff811fd34f<witness_lock>]
CSan: Racy Access [Cpu0 Write Addr=0xfffff800f6b219f0 Size=4
PC=0xffffffff811fd34f<witness_lock>] [Cpu1 Write Addr=0xfffff800f6b219f0 Size=4
PC=0xffffffff811fd34f<witness_lock>]
CSan: Racy Access [Cpu0 Write Addr=0xffffffff836310dc Size=1
PC=0xffffffff81196f35<sched_choose>] [Cpu1 Read Addr=0xffffffff836310dc Size=1
PC=0xffffffff8119225b<cpu_search_lowest>]
CSan: Racy Access [Cpu1 Write Addr=0xfffff800f6b217e8 Size=8
PC=0xffffffff811fd33e<witness_lock>] [Cpu0 Write Addr=0xfffff800f6b217e8 Size=8
PC=0xffffffff811fd33e<witness_lock>]
CSan: Racy Access [Cpu1 Write Addr=0xffffffff823167a8 Size=8
PC=0xffffffff81167c71<tc_windup>] [Cpu0 Read Addr=0xffffffff823167a8 Size=8
PC=0xffffffff81168706<cpu_tick_calibration>]
CSan: Racy Access [Cpu0 Write Addr=0xfffff800f6b219f0 Size=4
PC=0xffffffff811fd34f<witness_lock>] [Cpu1 Write Addr=0xfffff800f6b219f0 Size=4
PC=0xffffffff811fd34f<witness_lock>]
CSan: Racy Access [Cpu0 Write Addr=0xfffff800f6b219e8 Size=8
PC=0xffffffff811fd33e<witness_lock>] [Cpu1 Write Addr=0xfffff800f6b219e8 Size=8
PC=0xffffffff811fd33e<witness_lock>]
CSan: Racy Access [Cpu0 Write Addr=0xfffff800f6b21968 Size=8
PC=0xffffffff811fd33e<witness_lock>] [Cpu1 Write Addr=0xfffff800f6b21968 Size=8
PC=0xffffffff811fd33e<witness_lock>]
CSan: Racy Access [Cpu0 Write Addr=0xfffffe000852d0c8 Size=4
PC=0xffffffff8119730a<tdq_add>] [Cpu1 Read Addr=0xfffffe000852d0c8 Size=4
PC=0xffffffff81196e8d<sched_runnable>]
CSan: Racy Access [Cpu1 Write Addr=0xfffff800f6b217f0 Size=4
PC=0xffffffff811fd34f<witness_lock>] [Cpu0 Write Addr=0xfffff800f6b217f0 Size=4
PC=0xffffffff811fd34f<witness_lock>]

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