| commit | b7a0c923b657daebf51c8367fb812f50df253490 | [log] [tgz] |
|---|---|---|
| author | Nick Maniscalco <maniscalco@fuchsia.infra.roller.google.com> | Wed Feb 15 21:43:53 2023 +0000 |
| committer | Copybara-Service <copybara-worker@google.com> | Wed Feb 15 13:45:30 2023 -0800 |
| tree | 0d8250b3f6a94ac706b14f22e49cefbbed6fea38 | |
| parent | 67b409d28c98b73f8bdcd634bf63fe951f518845 [diff] |
[roll] Roll fuchsia [kernel][ktrace] Fix race condition in ktrace record creation This change fixes a bug in ktrace that could manifest as a failed debug assert. See fxbug.dev/120711 for details. Remove unused PendingCommit::observed_grpmask_ field. Replace grpmask_and_inflight_writes_ with a new field, write_state_ that encodes both the in-flight count and a writes-enabled bit. Because we emit group-less name records at trace initialization, group mask alone is insufficient to control whether writes are enabled. Move the group mask into its own dedicated atomic field that's checked by writers before attempting to increment. Change KTraceState::IncPendingWrite to only increment if writes are enabled and return false otherwise. KTraceState::Reserve will now fail with ZX_ERR_BAD_STATE if called when tracing is stopped. Original-Fixed: 120711 Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/801688 Original-Revision: 20911e10ff06d2a1563749e1cd92a4a4f65314a2 GitOrigin-RevId: bacf0b546faecbfa296dc29a95b011e285cf0656 Change-Id: I315d5c09cf52a11d4a6b2bade60099529d91e4fb
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