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File 1097-erts-Fix-bug-when-resetting-call_time-memory-while-t.patch of Package erlang
From 9e1fa96c2850ae360969331a20f1b7dbcda2fff8 Mon Sep 17 00:00:00 2001 From: Sverker Eriksson <sverker@erlang.org> Date: Wed, 2 Oct 2024 17:21:04 +0200 Subject: [PATCH] erts: Fix bug when resetting call_time/memory while tracing Clearing the BpDataCallTrace hashes under the feet of executing processes could cause crash. Instead allocate a new cleared BpDataCallTrace for the staged breakpoint. --- erts/emulator/beam/beam_bp.c | 42 ++++++------ erts/emulator/beam/beam_bp.h | 2 +- erts/emulator/test/trace_call_time_SUITE.erl | 70 +++++++++++++++++++- 3 files changed, 92 insertions(+), 22 deletions(-) diff --git a/erts/emulator/beam/beam_bp.c b/erts/emulator/beam/beam_bp.c index 7f105ce7c4..50c8c6eb90 100644 --- a/erts/emulator/beam/beam_bp.c +++ b/erts/emulator/beam/beam_bp.c @@ -121,6 +121,7 @@ static GenericBpData* check_break(const ErtsCodeInfo *ci, Uint break_flags); static void bp_meta_unref(BpMetaTracer *bmt); static void bp_count_unref(BpCount *bcp); +static BpDataTime* bp_time_alloc(void); static void bp_time_unref(BpDataTime *bdt); static void consolidate_bp_data(Module *modp, ErtsCodeInfo *ci, int local); static void uninstall_breakpoint(ErtsCodeInfo *ci); @@ -380,7 +381,6 @@ consolidate_bp_data(Module* modp, ErtsCodeInfo *ci_rw, int local) if (flags & ERTS_BPF_TIME_TRACE) { dst->time = src->time; erts_refc_inc(&dst->time->refc, 1); - ASSERT(dst->time->hash); } } @@ -1308,6 +1308,11 @@ static void bp_hash_delete(bp_time_hash_t *hash) { hash->item = NULL; } +static void bp_hash_reset(BpDataTime** bdt_p) { + bp_time_unref(*bdt_p); + *bdt_p = bp_time_alloc(); +} + void erts_schedule_time_break(Process *p, Uint schedule) { process_breakpoint_time_t *pbt = NULL; bp_data_time_item_t sitem, *item = NULL; @@ -1388,6 +1393,7 @@ set_break(BpFunctions* f, Binary *match_spec, Uint break_flags, } } + static void set_function_break(ErtsCodeInfo *ci, Binary *match_spec, Uint break_flags, enum erts_break_op count_op, ErtsTracer tracer) @@ -1450,17 +1456,11 @@ set_function_break(ErtsCodeInfo *ci, Binary *match_spec, Uint break_flags, ASSERT((bp->flags & ~ERTS_BPF_ALL) == 0); return; } else if (common & ERTS_BPF_TIME_TRACE) { - BpDataTime* bdt = bp->time; - Uint i = 0; - if (count_op == ERTS_BREAK_PAUSE) { bp->flags &= ~ERTS_BPF_TIME_TRACE_ACTIVE; } else { bp->flags |= ERTS_BPF_TIME_TRACE_ACTIVE; - for (i = 0; i < bdt->n; i++) { - bp_hash_delete(&(bdt->hash[i])); - bp_hash_init(&(bdt->hash[i]), 32); - } + bp_hash_reset(&bp->time); } ASSERT((bp->flags & ~ERTS_BPF_ALL) == 0); return; @@ -1492,18 +1492,8 @@ set_function_break(ErtsCodeInfo *ci, Binary *match_spec, Uint break_flags, erts_atomic_init_nob(&bcp->acount, 0); bp->count = bcp; } else if (break_flags & ERTS_BPF_TIME_TRACE) { - BpDataTime* bdt; - Uint i; - ASSERT((bp->flags & ERTS_BPF_TIME_TRACE) == 0); - bdt = Alloc(sizeof(BpDataTime)); - erts_refc_init(&bdt->refc, 1); - bdt->n = erts_no_schedulers + 1; - bdt->hash = Alloc(sizeof(bp_time_hash_t)*(bdt->n)); - for (i = 0; i < bdt->n; i++) { - bp_hash_init(&(bdt->hash[i]), 32); - } - bp->time = bdt; + bp->time = bp_time_alloc(); } bp->flags |= break_flags; @@ -1578,6 +1568,19 @@ bp_count_unref(BpCount* bcp) } } +static BpDataTime* bp_time_alloc(void) +{ + const Uint n = erts_no_schedulers + 1; + BpDataTime *bdt = Alloc(offsetof(BpDataTime,hash) + + sizeof(bp_time_hash_t)*n); + bdt->n = n; + erts_refc_init(&bdt->refc, 1); + for (Uint i = 0; i < n; i++) { + bp_hash_init(&(bdt->hash[i]), 32); + } + return bdt; +} + static void bp_time_unref(BpDataTime* bdt) { @@ -1587,7 +1590,6 @@ bp_time_unref(BpDataTime* bdt) for (i = 0; i < bdt->n; ++i) { bp_hash_delete(&(bdt->hash[i])); } - Free(bdt->hash); Free(bdt); } } diff --git a/erts/emulator/beam/beam_bp.h b/erts/emulator/beam/beam_bp.h index 3688f08332..d9b786dd1f 100644 --- a/erts/emulator/beam/beam_bp.h +++ b/erts/emulator/beam/beam_bp.h @@ -40,8 +40,8 @@ typedef struct { typedef struct bp_data_time { /* Call time */ Uint n; - bp_time_hash_t *hash; erts_refc_t refc; + bp_time_hash_t hash[1]; } BpDataTime; typedef struct { diff --git a/erts/emulator/test/trace_call_time_SUITE.erl b/erts/emulator/test/trace_call_time_SUITE.erl index 2da660c881..df22e3d0f1 100644 --- a/erts/emulator/test/trace_call_time_SUITE.erl +++ b/erts/emulator/test/trace_call_time_SUITE.erl @@ -35,7 +35,7 @@ -export([seq/3, seq_r/3]). -export([loaded/1, a_function/1, a_called_function/1, dec/1, nif_dec/1, dead_tracer/1, - return_stop/1,catch_crash/1]). + return_stop/1,reset/1,catch_crash/1]). -define(US_ERROR, 10000). -define(R_ERROR, 0.8). @@ -91,6 +91,7 @@ all() -> disable_ongoing, apply_bif_bug, combo, bif, nif, called_function, dead_tracer, return_stop, + reset, catch_crash]. %% Tests basic call time trace @@ -633,6 +634,73 @@ spinner(N) -> quicky() -> done. +%% OTP-19269: Verify call_time is reset correctly +%% while traced functions are called. +reset(_Config) -> + erlang:trace_pattern({'_','_','_'}, false, [call_time]), + + CallTimeReader = fun({P,Cnt,_,_}) -> {P,Cnt} end, + reset_do(call_time, true, CallTimeReader), + reset_do(call_time, restart, CallTimeReader), + ok. + +reset_do(TraceType, ResetArg, InfoReader) -> + %% + 1 = erlang:trace_pattern({?MODULE,aaa, 0}, true, [TraceType]), + 1 = erlang:trace_pattern({?MODULE,bbb, 0}, true, [TraceType]), + + Np = erlang:system_info(schedulers_online), + Tester = self(), + Pids = [begin + Pid = spawn_opt(fun() -> + receive go -> ok end, + aaa(), + bbb(), + Tester ! {running, self()}, + loop_aaa_bbb() + end, + [link, {scheduler,I}]), + erlang:trace(Pid, true, [call]), + Pid ! go, + Pid + end + || I <- lists:seq(1,Np)], + + %% Wait for all to make at least one traced call + [receive {running, P} -> ok end || P <- Pids], + + {TraceType, AAA1} = erlang:trace_info({?MODULE,aaa,0}, TraceType), + + io:format("Reset trace counters for aaa.\n", []), + 1 = erlang:trace_pattern({?MODULE,aaa, 0}, ResetArg, [TraceType]), + + {TraceType, AAA2} = erlang:trace_info({?MODULE,aaa,0}, TraceType), + {TraceType, BBB} = erlang:trace_info({?MODULE,bbb,0}, TraceType), + + %% Verify counters are sane + lists:zipwith3(fun({P, ACnt1}=A1, + {P, ACnt2}=A2, + {P, BCnt}=B) -> + io:format("A1=~p A2=~p B=~p\n", [A1,A2,B]), + true = (ACnt1+ACnt2 =< BCnt) + end, + lists:sort(lists:map(InfoReader, AAA1)), + lists:sort(lists:map(InfoReader, AAA2)), + lists:sort(lists:map(InfoReader, BBB))), + + [P ! die || P <- Pids], + 1 = erlang:trace_pattern({?MODULE,aaa, 0}, false, [TraceType]), + 1 = erlang:trace_pattern({?MODULE,bbb, 0}, false, [TraceType]), + ok. + +loop_aaa_bbb() -> + aaa = aaa(), + bbb = bbb(), + receive die -> ok + after 0 -> loop_aaa_bbb() + end. + + %% OTP-16994: next_catch returned a bogus stack pointer when call_time tracing %% was enabled, crashing the emulator. catch_crash(_Config) -> -- 2.43.0
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