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b8610c3d93
With multiple L2ARC devices, headers can be destroyed asynchronously (e.g., during zpool sync) while L2_WRITING is set. The original code destroyed L2HDR before L1HDR, causing ABDs to lose their device association (b_l2hdr.b_dev) when arc_hdr_free_abd() is called. This caused ABDs to be added to the global free-on-write list without device information. When any L2ARC device completed its write and attempted to free these orphaned ABDs, it would panic on ASSERT(!list_link_active(&abd->abd_gang_link)) because the ABD was still part of another device's vdev_queue I/O aggregation gang. Fix by extending l2ad_mtx lock scope to cover L1HDR destruction and reordering to destroy L1HDR before L2HDR when L2_WRITING is set. This ensures arc_hdr_free_abd() can access b_l2hdr.b_dev to properly tag ABDs with their device for deferred cleanup. Reviewed-by: Alexander Motin <alexander.motin@TrueNAS.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Ameer Hamza <ahamza@ixsystems.com> Closes #18093 |
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