On deallocation, sampled pointers (specially aligned) get junked and stashed
into tcache (to prevent immediate reuse). The expected behavior is to have
read-after-free corrupted and stopped by the junk-filling, while
write-after-free is checked when flushing the stashed pointers.
Many profiling related tests make assumptions on the profiling settings,
e.g. opt_prof is off by default, and prof_active is default on when opt_prof is
on. However the default settings can be changed via --with-malloc-conf at build
time. Fixing the tests by adding the assumed settings explicitly.
Also refactor the handling of the non-deterministic case. Notably allow the
case with narenas set to proceed w/o warnings, to not affect existing valid use
cases.
nstime module guarantees monotonic clock update within a single nstime_t. This
means, if two separate nstime_t variables are read and updated separately,
nstime_subtract between them may result in underflow. Fixed by switching to the
time since utility provided by nstime.
Determinitic number of CPUs is important for percpu arena to work
correctly, since it uses cpu index - sched_getcpu(), and if it will
greater then number of CPUs bad thing will happen, or assertion will be
failed in debug build:
<jemalloc>: ../contrib/jemalloc/src/jemalloc.c:321: Failed assertion: "ind <= narenas_total_get()"
Aborted (core dumped)
Number of CPUs can be obtained from the following places:
- sched_getaffinity()
- sysconf(_SC_NPROCESSORS_ONLN)
- sysconf(_SC_NPROCESSORS_CONF)
For the sched_getaffinity() you may simply use taskset(1) to run program
on a different cpu, and in case it will be not first, percpu will work
incorrectly, i.e.:
$ taskset --cpu-list $(( $(getconf _NPROCESSORS_ONLN)-1 )) <your_program>
_SC_NPROCESSORS_ONLN uses /sys/devices/system/cpu/online, LXD/LXC
virtualize /sys/devices/system/cpu/online file [1], and so when you run
container with limited limits.cpus it will bind randomly selected CPU to
it
[1]: https://github.com/lxc/lxcfs/issues/301
_SC_NPROCESSORS_CONF uses /sys/devices/system/cpu/cpu*, and AFAIK nobody
playing with dentries there.
So if all three of these are equal, percpu arenas should work correctly.
And a small note regardless _SC_NPROCESSORS_ONLN/_SC_NPROCESSORS_CONF,
musl uses sched_getaffinity() for both. So this will also increase the
entropy.
Also note, that you can check is percpu arena really applied using
abort_conf:true.
Refs: https://github.com/jemalloc/jemalloc/pull/1939
Refs: https://github.com/ClickHouse/ClickHouse/issues/32806
v2: move malloc_cpu_count_is_deterministic() into
malloc_init_hard_recursible() since _SC_NPROCESSORS_CONF does
allocations for readdir()
v3:
- mark cpu_count_is_deterministic static
- check only if percpu arena is enabled
- check narenas
Currently used only for guarding purposes, the hint is used to determine
if the allocation is supposed to be frequently reused. For example, it
might urge the allocator to ensure the allocation is cached.
While initially this file contained helper functions for one particular
test, now its usage spread across different test files. Purpose has
shifted towards a collection of handy arena ctl wrappers.
With prof enabled, number of page aligned allocations doesn't match the
number of slab "ends" because prof allocations skew the addresses. It
leads to 'pages' array overflow and hard to debug failures.
The CI consolidation project adds more operating systems to Travis. This
refactoring is aimed to decouple the configuration of each individual OS
from the actual job matrix generation and formatting. Otherwise,
format_job function would turn into a huge collection of ad-hoc
conditions.
The option has been misleading, because it stays disabled unless
prof_final is also specified. In practice it's impossible to detect that
the option is silently disabled, because it just doesn't provide any
output as if there are no memory leaks detected.
Some nstime_t operations require and assume the input nstime is initialized
(e.g. nstime_update) -- uninitialized input may cause silent failures which is
difficult to reproduce / debug. Add an explicit flag to track the state
(limited to debug build only).
Also fixed an use case in hpa (time of last_purge).
In order for nstime_update to handle non-monotonic clocks, it requires the input
nstime to be initialized -- when reading for the first time, zero init has to be
done. Otherwise random stack value may be seen as clocks and returned.
The event counters maintain a relationship with the current bytes: last_event <=
current < next_event. When a reinit happens (e.g. reincarnated tsd), the last
event needs progressing because all events start fresh from the current bytes.
When opt_retain is on, slab extents remain guarded in all states, even
retained. This works well if arena is never destroyed, because we
anticipate those slabs will be eventually reused. But if the arena is
destroyed, the slabs must be unguarded to prevent leaking guard pages.
On the rtree metadata lookup fast path, there will never be a NULL returned when
the cache key matches (which is unknown to the compiler). The previous logic
was checking for NULL return value, resulting in the extra branch (in addition to
the cache key match checking). Make the lookup_fast return a bool to indicate
cache miss / match, so that the extra branch is avoided.
As the code evolves, some code paths that have previously assigned
deferred_work_generated may cease being reached. This would leave the value
uninitialized. This change initializes the value for safety.
