runtime/pprof: TestGoroutineCounts failures [consistent failure]

[gopherbot]

#!watchflakes
default <- pkg == "runtime/pprof" && test == "TestGoroutineCounts"

Issue created automatically to collect these failures.

Example (log):

=== RUN   TestGoroutineCounts
SIGBUS: bus error
PC=0x102711a34 m=3 sigcode=1 addr=0x1027e0088

goroutine 0 gp=0xc000003180 m=3 mp=0xc000049008 [idle]:

goroutine 225 gp=0xc000082a80 m=3 mp=0xc000049008 [running]:
runtime.systemstack_switch()
	/Users/swarming/.swarming/w/ir/x/w/goroot/src/runtime/asm_arm64.s:249 +0x8 fp=0xc0000f3ad0 sp=0xc0000f3ac0 pc=0x1027ad068
runtime.startTheWorld({0x78?, 0x102790f78?, 0xc000082a80?, 0xc000082a80?})
...
r24     0x0
r25     0xc0000380d8
r26     0x16d8b2d08
r27     0xffffffffffffff80
r28     0xc000003180
r29     0x16d8b2cc8
lr      0x1027115d8
sp      0x16d8b2c30
pc      0x102711a34
fault   0x1027e0088

— watchflakes

[gopherbot]

Found new dashboard test flakes for:

#!watchflakes
default <- pkg == "runtime/pprof" && test == "TestGoroutineCounts"

2025-08-12 05:59 gotip-darwin-arm64-race go@74421a30 runtime/pprof.TestGoroutineCounts [SKIP] (log)

=== RUN   TestGoroutineCounts
SIGBUS: bus error
PC=0x102711a34 m=3 sigcode=1 addr=0x1027e0088

goroutine 0 gp=0xc000003180 m=3 mp=0xc000049008 [idle]:

goroutine 225 gp=0xc000082a80 m=3 mp=0xc000049008 [running]:
runtime.systemstack_switch()
	/Users/swarming/.swarming/w/ir/x/w/goroot/src/runtime/asm_arm64.s:249 +0x8 fp=0xc0000f3ad0 sp=0xc0000f3ac0 pc=0x1027ad068
runtime.startTheWorld({0x78?, 0x102790f78?, 0xc000082a80?, 0xc000082a80?})
...
r24     0x0
r25     0xc0000380d8
r26     0x16d8b2d08
r27     0xffffffffffffff80
r28     0xc000003180
r29     0x16d8b2cc8
lr      0x1027115d8
sp      0x16d8b2c30
pc      0x102711a34
fault   0x1027e0088

2025-08-12 16:00 gotip-darwin-arm64-race go@d0a64f79 runtime/pprof.TestGoroutineCounts [SKIP] (log)

=== RUN   TestGoroutineCounts
SIGBUS: bus error
PC=0x10224da34 m=2 sigcode=1 addr=0x10231c088

goroutine 0 gp=0xc000002a80 m=2 mp=0xc000048808 [idle]:

goroutine 32 gp=0xc000003a40 m=2 mp=0xc000048808 [running]:
runtime.systemstack_switch()
	/Users/swarming/.swarming/w/ir/x/w/goroot/src/runtime/asm_arm64.s:249 +0x8 fp=0xc0010fdad0 sp=0xc0010fdac0 pc=0x1022e9068
runtime.startTheWorld({0x78?, 0x1022ccf78?, 0xc000003a40?, 0xc000003a40?})
...
r24     0x0
r25     0xc0000380b8
r26     0x16dcead08
r27     0xffffffffffffff80
r28     0xc000002a80
r29     0x16dceacc8
lr      0x10224d5d8
sp      0x16dceac30
pc      0x10224da34
fault   0x10231c088

2025-08-12 16:15 gotip-darwin-arm64-race go@ec9e1176 runtime/pprof.TestGoroutineCounts [SKIP] (log)

=== RUN   TestGoroutineCounts
SIGBUS: bus error
PC=0x100d89a34 m=0 sigcode=1 addr=0x100e58088

goroutine 0 gp=0x1011ced40 m=0 mp=0x1011cf680 [idle]:

goroutine 77 gp=0xc000003a40 m=0 mp=0x1011cf680 [running]:
runtime.systemstack_switch()
	/Users/swarming/.swarming/w/ir/x/w/goroot/src/runtime/asm_arm64.s:249 +0x8 fp=0xc000285ad0 sp=0xc000285ac0 pc=0x100e25068
runtime.startTheWorld({0x78?, 0x100e08f78?, 0xc000003a40?, 0xc000003a40?})
...
r24     0x19ef8e000
r25     0xc000035ae0
r26     0x16f09a798
r27     0x40
r28     0x1011ced40
r29     0x16f09a758
lr      0x100d895d8
sp      0x16f09a6c0
pc      0x100d89a34
fault   0x100e58088

2025-08-12 18:19 gotip-darwin-arm64-race go@182336bf runtime/pprof.TestGoroutineCounts [SKIP] (log)

=== RUN   TestGoroutineCounts
SIGBUS: bus error
PC=0x100b39a34 m=4 sigcode=1 addr=0x100c081b8

goroutine 0 gp=0xc0000821c0 m=4 mp=0xc000080008 [idle]:

goroutine 225 gp=0xc000003a40 m=4 mp=0xc000080008 [running]:
runtime.systemstack_switch()
	/Users/swarming/.swarming/w/ir/x/w/goroot/src/runtime/asm_arm64.s:249 +0x8 fp=0xc001487ad0 sp=0xc001487ac0 pc=0x100bd5218
runtime.startTheWorld({0x78?, 0x100bb90a8?, 0xc000003a40?, 0xc000003a40?})
...
r24     0x0
r25     0xc000035ab8
r26     0x16f516d08
r27     0xffffffffffffffc0
r28     0xc0000821c0
r29     0x16f516cc8
lr      0x100b395d8
sp      0x16f516c30
pc      0x100b39a34
fault   0x100c081b8

— watchflakes

[mknyszek]

CC @cherrymui @dr2chase This seems to be related to a whole lot of failures on the Darwin race builder. Looking at the history, it seems like the instability started with https://go-review.googlesource.com/c/go/+/692996.