Patch "afs: Improve server refcount/active count tracing" has been added to the 6.12-stable tree
gregkh at linuxfoundation.org
gregkh at linuxfoundation.org
Thu Jul 30 05:50:15 PDT 2026
This is a note to let you know that I've just added the patch titled
afs: Improve server refcount/active count tracing
to the 6.12-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
afs-improve-server-refcount-active-count-tracing.patch
and it can be found in the queue-6.12 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable at vger.kernel.org> know about it.
>From stable+bounces-290944-greg=kroah.com at vger.kernel.org Thu Jul 30 03:02:25 2026
From: Sasha Levin <sashal at kernel.org>
Date: Wed, 29 Jul 2026 21:01:30 -0400
Subject: afs: Improve server refcount/active count tracing
To: stable at vger.kernel.org
Cc: David Howells <dhowells at redhat.com>, Marc Dionne <marc.dionne at auristor.com>, linux-afs at lists.infradead.org, linux-fsdevel at vger.kernel.org, Sasha Levin <sashal at kernel.org>
Message-ID: <20260730010137.1700032-1-sashal at kernel.org>
From: David Howells <dhowells at redhat.com>
[ Upstream commit 76daa300d41acc1180f8a46eead36905054beafb ]
Improve server refcount/active count tracing to distinguish between simply
getting/putting a ref and using/unusing the server record (which changes
the activity count as well as the refcount). This makes it a bit easier to
work out what's going on.
Signed-off-by: David Howells <dhowells at redhat.com>
cc: Marc Dionne <marc.dionne at auristor.com>
cc: linux-afs at lists.infradead.org
cc: linux-fsdevel at vger.kernel.org
Link: https://lore.kernel.org/r/20250224234154.2014840-10-dhowells@redhat.com/ # v1
Link: https://lore.kernel.org/r/20250310094206.801057-6-dhowells@redhat.com/ # v4
Stable-dep-of: 330e2c514823 ("afs: Fix dynamic lookup to fail on cell lookup failure")
Signed-off-by: Sasha Levin <sashal at kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh at linuxfoundation.org>
---
fs/afs/fsclient.c | 4 ++--
fs/afs/rxrpc.c | 2 +-
fs/afs/server.c | 11 ++++++-----
fs/afs/server_list.c | 4 ++--
include/trace/events/afs.h | 27 +++++++++++++++------------
5 files changed, 26 insertions(+), 22 deletions(-)
--- a/fs/afs/fsclient.c
+++ b/fs/afs/fsclient.c
@@ -1650,7 +1650,7 @@ int afs_fs_give_up_all_callbacks(struct
bp = call->request;
*bp++ = htonl(FSGIVEUPALLCALLBACKS);
- call->server = afs_use_server(server, afs_server_trace_give_up_cb);
+ call->server = afs_use_server(server, afs_server_trace_use_give_up_cb);
afs_make_call(call, GFP_NOFS);
afs_wait_for_call_to_complete(call);
ret = call->error;
@@ -1756,7 +1756,7 @@ bool afs_fs_get_capabilities(struct afs_
return false;
call->key = key;
- call->server = afs_use_server(server, afs_server_trace_get_caps);
+ call->server = afs_use_server(server, afs_server_trace_use_get_caps);
call->peer = rxrpc_kernel_get_peer(estate->addresses->addrs[addr_index].peer);
call->probe = afs_get_endpoint_state(estate, afs_estate_trace_get_getcaps);
call->probe_index = addr_index;
--- a/fs/afs/rxrpc.c
+++ b/fs/afs/rxrpc.c
@@ -190,7 +190,7 @@ static void afs_free_call(struct afs_cal
if (call->type->destructor)
call->type->destructor(call);
- afs_unuse_server_notime(call->net, call->server, afs_server_trace_put_call);
+ afs_unuse_server_notime(call->net, call->server, afs_server_trace_unuse_call);
kfree(call->request);
o = atomic_read(&net->nr_outstanding_calls);
--- a/fs/afs/server.c
+++ b/fs/afs/server.c
@@ -33,7 +33,7 @@ struct afs_server *afs_find_server(struc
do {
if (server)
- afs_unuse_server_notime(net, server, afs_server_trace_put_find_rsq);
+ afs_unuse_server_notime(net, server, afs_server_trace_unuse_find_rsq);
server = NULL;
seq++; /* 2 on the 1st/lockless path, otherwise odd */
read_seqbegin_or_lock(&net->fs_addr_lock, &seq);
@@ -49,7 +49,7 @@ struct afs_server *afs_find_server(struc
server = NULL;
continue;
found:
- server = afs_maybe_use_server(server, afs_server_trace_get_by_addr);
+ server = afs_maybe_use_server(server, afs_server_trace_use_by_addr);
} while (need_seqretry(&net->fs_addr_lock, seq));
@@ -76,7 +76,7 @@ struct afs_server *afs_find_server_by_uu
* changes.
*/
if (server)
- afs_unuse_server(net, server, afs_server_trace_put_uuid_rsq);
+ afs_unuse_server(net, server, afs_server_trace_unuse_uuid_rsq);
server = NULL;
seq++; /* 2 on the 1st/lockless path, otherwise odd */
read_seqbegin_or_lock(&net->fs_lock, &seq);
@@ -91,7 +91,7 @@ struct afs_server *afs_find_server_by_uu
} else if (diff > 0) {
p = p->rb_right;
} else {
- afs_use_server(server, afs_server_trace_get_by_uuid);
+ afs_use_server(server, afs_server_trace_use_by_uuid);
break;
}
@@ -273,7 +273,8 @@ static struct afs_addr_list *afs_vl_look
}
/*
- * Get or create a fileserver record.
+ * Get or create a fileserver record and return it with an active-use count on
+ * it.
*/
struct afs_server *afs_lookup_server(struct afs_cell *cell, struct key *key,
const uuid_t *uuid, u32 addr_version)
--- a/fs/afs/server_list.c
+++ b/fs/afs/server_list.c
@@ -16,7 +16,7 @@ void afs_put_serverlist(struct afs_net *
if (slist && refcount_dec_and_test(&slist->usage)) {
for (i = 0; i < slist->nr_servers; i++)
afs_unuse_server(net, slist->servers[i].server,
- afs_server_trace_put_slist);
+ afs_server_trace_unuse_slist);
kfree_rcu(slist, rcu);
}
}
@@ -98,7 +98,7 @@ struct afs_server_list *afs_alloc_server
if (j < slist->nr_servers) {
if (slist->servers[j].server == server) {
afs_unuse_server(volume->cell->net, server,
- afs_server_trace_put_slist_isort);
+ afs_server_trace_unuse_slist_isort);
continue;
}
--- a/include/trace/events/afs.h
+++ b/include/trace/events/afs.h
@@ -132,22 +132,25 @@ enum yfs_cm_operation {
EM(afs_server_trace_destroy, "DESTROY ") \
EM(afs_server_trace_free, "FREE ") \
EM(afs_server_trace_gc, "GC ") \
- EM(afs_server_trace_get_by_addr, "GET addr ") \
- EM(afs_server_trace_get_by_uuid, "GET uuid ") \
- EM(afs_server_trace_get_caps, "GET caps ") \
EM(afs_server_trace_get_install, "GET inst ") \
- EM(afs_server_trace_get_new_cbi, "GET cbi ") \
EM(afs_server_trace_get_probe, "GET probe") \
- EM(afs_server_trace_give_up_cb, "giveup-cb") \
EM(afs_server_trace_purging, "PURGE ") \
- EM(afs_server_trace_put_call, "PUT call ") \
EM(afs_server_trace_put_cbi, "PUT cbi ") \
- EM(afs_server_trace_put_find_rsq, "PUT f-rsq") \
EM(afs_server_trace_put_probe, "PUT probe") \
- EM(afs_server_trace_put_slist, "PUT slist") \
- EM(afs_server_trace_put_slist_isort, "PUT isort") \
- EM(afs_server_trace_put_uuid_rsq, "PUT u-req") \
- E_(afs_server_trace_update, "UPDATE")
+ EM(afs_server_trace_see_expired, "SEE expd ") \
+ EM(afs_server_trace_unuse_call, "UNU call ") \
+ EM(afs_server_trace_unuse_create_fail, "UNU cfail") \
+ EM(afs_server_trace_unuse_find_rsq, "UNU f-rsq") \
+ EM(afs_server_trace_unuse_slist, "UNU slist") \
+ EM(afs_server_trace_unuse_slist_isort, "UNU isort") \
+ EM(afs_server_trace_unuse_uuid_rsq, "PUT u-req") \
+ EM(afs_server_trace_update, "UPDATE ") \
+ EM(afs_server_trace_use_by_addr, "USE addr ") \
+ EM(afs_server_trace_use_by_uuid, "USE uuid ") \
+ EM(afs_server_trace_use_cm_call, "USE cm-cl") \
+ EM(afs_server_trace_use_get_caps, "USE gcaps") \
+ EM(afs_server_trace_use_give_up_cb, "USE gvupc") \
+ E_(afs_server_trace_wait_create, "WAIT crt ")
#define afs_volume_traces \
EM(afs_volume_trace_alloc, "ALLOC ") \
@@ -1369,7 +1372,7 @@ TRACE_EVENT(afs_server,
__entry->reason = reason;
),
- TP_printk("s=%08x %s u=%d a=%d",
+ TP_printk("s=%08x %s r=%d a=%d",
__entry->server,
__print_symbolic(__entry->reason, afs_server_traces),
__entry->ref,
Patches currently in stable-queue which might be from sashal at kernel.org are
queue-6.12/wifi-ath12k-flush-the-posted-write-after-writing-to-.patch
queue-6.12/rxrpc-fix-notification-vs-call-release-vs-recvmsg.patch
queue-6.12/netfilter-nft_counter-serialize-reset-with-spinlock.patch
queue-6.12/btrfs-declare-btrfs_ioctl_search_args_v2-buf-as-__u8.patch
queue-6.12/wifi-mwifiex-bound-uap-association-event-ies-to-the-.patch
queue-6.12/powerpc-vtime-initialize-starttime-at-boot-for-nativ.patch
queue-6.12/bluetooth-mgmt-fix-locking-in-unpair_device-disconne.patch
queue-6.12/fbcon-rename-struct-fbcon_ops-to-struct-fbcon_par.patch
queue-6.12/ata-sata_dwc_460ex-use-platform_get_irq.patch
queue-6.12/net-hsr-fix-memory-leak-on-slave-unregistration-by-r.patch
queue-6.12/fpga-dfl-afu-validate-dma-mapping-length-in-afu_dma_map_region.patch
queue-6.12/wifi-mt76-mt7925-fix-crash-in-reset-link-replay.patch
queue-6.12/i2c-i801-fix-hardware-state-machine-corruption-in-error-path.patch
queue-6.12/ppp-enable-tx-scatter-gather.patch
queue-6.12/ice-allow-creating-vfs-when-config_ice_switchdev.patch
queue-6.12/xfrm-use-nested-bh-locking-for-nat_keepalive_sk_ipv.patch
queue-6.12/wifi-mac80211-tear-down-new-links-on-vif-update-erro.patch
queue-6.12/wifi-mac80211-fix-unsol_bcast_probe_resp-double-free.patch
queue-6.12/net-mlx5e-reject-unsupported-cb-shaper-tsa-in-ets-va.patch
queue-6.12/vduse-remove-unused-vaddr-parameter-of-vduse_domain_free_coherent.patch
queue-6.12/wifi-mac80211-recalculate-tim-when-a-station-enters-.patch
queue-6.12/netfilter-nf_tables-remove-unused-nft_reduce_is_readonly.patch
queue-6.12/rxrpc-use-irq-disabling-spinlocks-between-app-and-i-o-thread.patch
queue-6.12/wifi-cfg80211-derive-s1g-beacon-tsf-from-s1g-fields.patch
queue-6.12/bootconfig-fix-null-pointer-arithmetic-in-xbc_snprint_cmdline.patch
queue-6.12/hwmon-gigabyte_waterforce-stop-device-io-before-call.patch
queue-6.12/octeontx2-annotate-mmio-regions-as-__iomem.patch
queue-6.12/net-airoha-move-airoha_eth-driver-in-a-dedicated-fol.patch
queue-6.12/drm-tests-shmem-set-dma-mask-to-64-bit-in-drm_gem_sh.patch
queue-6.12/sunrpc-allocate-a-separate-bvec-array-for-socket-sends.patch
queue-6.12/wifi-mac80211_hwsim-clamp-virtio-rx-length-before-sk.patch
queue-6.12/bluetooth-qca-fix-nvm-tag-length-underflow-in-tlv-pa.patch
queue-6.12/xfs-factor-out-xfs_attr3_leaf_init.patch
queue-6.12/net-mana-validate-the-packet-length-reported-by-the-nic.patch
queue-6.12/xfrm-nat_keepalive-avoid-double-free-on-send-error.patch
queue-6.12/ata-sata_dwc_460ex-enable-sata-interrupts-only-after.patch
queue-6.12/rds-tcp-unregister-sysctl-before-tearing-down-listen.patch
queue-6.12/tcp-decrement-tcp_md5_needed-static-branch.patch
queue-6.12/afs-simplify-cell-record-handling.patch
queue-6.12/sctp-auth-verify-auth-requirement-when-auth_chunk-is.patch
queue-6.12/arm64-tegra-fix-cpu-compatible-string-to-cortex-a78a.patch
queue-6.12/mpls-fix-null-deref-in-mpls_valid_fib_dump_req-on-co.patch
queue-6.12/landlock-prepare-to-use-credential-instead-of-domain-for-fowner.patch
queue-6.12/thunderbolt-remove-service-debugfs-entries-during-unregister.patch
queue-6.12/hwmon-corsair-cpro-stop-device-io-before-calling-hid.patch
queue-6.12/octeontx2-af-cn10k-restrict-vf-lmtline-sharing-to-its-own-pf.patch
queue-6.12/sctp-fix-auth_hmacs-array-size-in-struct-sctp_cookie.patch
queue-6.12/dmaengine-dw-edma-fix-confusing-cleanup.h-syntax.patch
queue-6.12/sctp-validate-stream-count-in-sctp_process_strreset_.patch
queue-6.12/afs-fix-lack-of-locking-around-modifications-of-net-cells_dyn_ino.patch
queue-6.12/selftests-bpf-add-tests-for-ld_-abs-ind-failure-path.patch
queue-6.12/nfp-check-resource-mutex-allocation.patch
queue-6.12/netfilter-nf_tables-remove-register-tracking-infrastructure.patch
queue-6.12/net-mlx5-fix-mcia-register-buffer-overflow-on-32-dwo.patch
queue-6.12/dpaa2-switch-put-mac-endpoint-device-on-disconnect.patch
queue-6.12/mmc-vub300-fix-use-after-free-on-probe-failure.patch
queue-6.12/block-remove-redundant-gd_need_part_scan-in-add_disk_final.patch
queue-6.12/xprtrdma-clear-receive-side-ownership-pointers-on-re.patch
queue-6.12/ksmbd-validate-compound-request-size-before-reading-.patch
queue-6.12/wifi-ipw2100-fix-potential-memory-leak-in-ipw2100_pc.patch
queue-6.12/remoteproc-xlnx-check-remote-core-state.patch
queue-6.12/ata-libata-core-reject-an-invalid-concurrent-positioning-ranges-count.patch
queue-6.12/xfrm6-clear-dst.dev-on-error-to-avoid-double-netdev_.patch
queue-6.12/wifi-p54-validate-rx-frame-length-in-p54_rx_eeprom_r.patch
queue-6.12/input-ims-pcu-fix-logic-error-in-packet-reset.patch
queue-6.12/bpf-refactor-check_ctx_access.patch
queue-6.12/asoc-cs35l56-use-complete_all-to-signal-init_complet.patch
queue-6.12/bootconfig-move-xbc_snprint_cmdline-to-lib-bootconfig.c.patch
queue-6.12/gve-fix-rx-queue-stall-on-alloc-failure.patch
queue-6.12/rxrpc-pull-out-certain-app-callback-funcs-into-an-ops-table.patch
queue-6.12/can-j1939-fix-lockless-local-destination-check.patch
queue-6.12/net-ipa-fix-smem-state-handle-leaks-in-smp2p-init.patch
queue-6.12/powerpc-time-prepare-to-stop-elapsing-in-dynticks-id.patch
queue-6.12/octeontx2-pf-clear-stale-mailbox-irq-state-before-request_irq.patch
queue-6.12/net-dpaa-fix-mode-setting.patch
queue-6.12/io_uring-rw-fix-missing-erestartsys-conversion-in-re.patch
queue-6.12/dpll-add-clock-quality-level-attribute-and-op.patch
queue-6.12/wifi-mt76-mt7996-fix-possible-null-pointer-deref-in-.patch
queue-6.12/wifi-nl80211-free-rnr-data-on-mbssid-mismatch.patch
queue-6.12/amt-re-read-skb-header-pointers-after-every-pull.patch
queue-6.12/fbcon-use-correct-type-for-vc_resize-return-value.patch
queue-6.12/mm-sparse-vmemmap-fix-vmemmap-accounting-underflow.patch
queue-6.12/can-bcm-track-a-single-source-interface-for-anydev-t.patch
queue-6.12/rxrpc-fix-cpu-time-starvation-in-i-o-thread.patch
queue-6.12/netfilter-nf_conntrack_sip-remove-net-variable-shadowing.patch
queue-6.12/btrfs-free-mapping-node-on-duplicate-reloc-root-inse.patch
queue-6.12/ppp-use-iff_no_queue-in-virtual-interfaces.patch
queue-6.12/asoc-bt-sco-fix-duplicate-dapm-widget-names-for-wide.patch
queue-6.12/wifi-cfg80211-validate-pmsr-measurement-type-data.patch
queue-6.12/gtp-check-skb_pull_data-return-in-gtp1u_send_echo_re.patch
queue-6.12/cleanup-add-a-scoped-version-of-class.patch
queue-6.12/usb-gadget-use-str_enable_disable-like-helpers.patch
queue-6.12/wifi-mac80211-fix-fils_discovery-double-free-on-allo.patch
queue-6.12/asoc-cs35l56-fix-potential-probe-deadlock.patch
queue-6.12/hwmon-nzxt-kraken3-stop-device-io-before-calling-hid.patch
queue-6.12/btrfs-fix-root-leak-if-its-reloc-root-is-unexpected-.patch
queue-6.12/rdma-erdma-initialize-ret-for-empty-receive-wr-lists.patch
queue-6.12/amd-xgbe-fix-mac_auto_sw-handling-in-cl37-an.patch
queue-6.12/net-mctp-i3c-clean-up-notifier-and-buses-if-driver-r.patch
queue-6.12/hwmon-asus-ec-sensors-fix-looping-over-banks-while-r.patch
queue-6.12/btrfs-don-t-propagate-extent_flag_logging-to-split-e.patch
queue-6.12/selftests-alsa-fix-memory-leak-in-find_controls-erro.patch
queue-6.12/vduse-avoid-leaking-information-to-userspace.patch
queue-6.12/asoc-mediatek-mt8192-check-runtime-resume-during-probe.patch
queue-6.12/iommu-amd-bound-the-early-acpi-hid-map.patch
queue-6.12/dm-avoid-leaking-the-caller-s-thread-keyring-via-the-table-device-file.patch
queue-6.12/tipc-restrict-socket-queue-dumps-in-enqueue-tracepoints.patch
queue-6.12/wifi-ath6kl-fix-oob-read-from-firmware-ie-lengths-in.patch
queue-6.12/bluetooth-mgmt-hold-reference-for-hci_conn-in-mgmt_p.patch
queue-6.12/hwmon-occ-validate-poll-response-sensor-blocks.patch
queue-6.12/drivers-virt-pkvm-fix-end-calculation-in-mmio_guard_.patch
queue-6.12/rdma-cma-fix-hardware-address-comparison-length-in-n.patch
queue-6.12/arm64-dts-qcom-correct-rbr-opp-entry.patch
queue-6.12/pds_core-fix-use-after-free-on-workqueue-during-remo.patch
queue-6.12/rdma-irdma-prevent-overflows-in-memory-contiguity-ch.patch
queue-6.12/ppp-annotate-data-races-in-ppp_generic.patch
queue-6.12/arm64-dts-qcom-hamoa-fix-opp-tables-for-all-displayport-controllers.patch
queue-6.12/wifi-libertas-fix-memory-leak-in-helper_firmware_cb.patch
queue-6.12/platform-x86-intel-uncore-freq-fix-current_freq_khz-.patch
queue-6.12/mmc-vub300-fix-use-after-free-on-disconnect.patch
queue-6.12/pds_core-check-for-workqueue-allocation-failure.patch
queue-6.12/mtd-maps-vmu-flash-fix-fault-in-unaligned-fixup.patch
queue-6.12/drm-i915-selftests-fix-gt-pm-sort-comparators.patch
queue-6.12/tipc-fix-infinite-loop-in-__tipc_nl_compat_dumpit.patch
queue-6.12/asoc-cs42l43-correct-report-for-forced-microphone-ja.patch
queue-6.12/alsa-usb-audio-skip-dsd-quirk-for-musical-fidelity-m.patch
queue-6.12/accel-ivpu-fix-wrong-register-read-in-lnl-failure-di.patch
queue-6.12/bpf-sockmap-fix-cork-use-after-free-in-tcp_bpf_sendm.patch
queue-6.12/usb-atm-ueagle-atm-reject-descriptors-that-confuse-p.patch
queue-6.12/wifi-cfg80211-validate-pmsr-ftm-preamble-range.patch
queue-6.12/ksmbd-validate-num_subauth-when-copying-ace-in-set_n.patch
queue-6.12/can-bcm-fix-data-race-on-rx_stamp-rx_ifindex-in-bcm_.patch
queue-6.12/net-airoha-fix-ets-channel-derivation-in-airoha_tc_s.patch
queue-6.12/gpu-buddy-bail-out-of-try_harder-when-alignment-cannot-be-honoured.patch
queue-6.12/wifi-cfg80211-pass-net_device-to-.set_monitor_channe.patch
queue-6.12/wifi-mt76-connac-fix-possible-null-pointer-deref-in-.patch
queue-6.12/bpf-fix-same-register-dst-src-oob-read-and-pointer-l.patch
queue-6.12/iommu-intel-fix-out-of-bounds-memset-in-dmar_latency.patch
queue-6.12/wifi-mt76-mt7925-fix-possible-null-pointer-deref-in-.patch
queue-6.12/can-bcm-add-locking-when-updating-filter-and-timer-v.patch
queue-6.12/iommufd-avoid-partial-fault-group-delivery-in-iommufd_fault_fops_read.patch
queue-6.12/wifi-iwlwifi-mvm-validate-sar-geo-response-payload-s.patch
queue-6.12/revert-drm-amd-display-add-missing-kdoc-for-allm-par.patch
queue-6.12/afs-fix-dynamic-lookup-to-fail-on-cell-lookup-failure.patch
queue-6.12/scsi-core-wake-eh-reliably-when-using-scsi_schedule_.patch
queue-6.12/sunrpc-add-helpers-to-convert-xdr_buf-byte-ranges-to-scatterlists.patch
queue-6.12/wifi-iwlwifi-mvm-fix-read-in-wake-packet-notificatio.patch
queue-6.12/vduse-take-out-allocations-from-vduse_dev_alloc_coherent.patch
queue-6.12/ppp-convert-to-percpu-netstats.patch
queue-6.12/iomap-correct-the-range-of-a-partial-dirty-clear.patch
queue-6.12/wifi-nl80211-validate-nested-mbssid-ie-blobs.patch
queue-6.12/bonding-fix-devconf_all-null-dereference-when-ipv6-i.patch
queue-6.12/watchdog-pretimeout-fix-uaf-in-watchdog_unregister_g.patch
queue-6.12/audit-use-unsigned-int-instead-of-unsigned.patch
queue-6.12/net-airoha-fix-skb-priority-underflow-in-airoha_dev_.patch
queue-6.12/rds-drop-incoming-messages-that-cross-network-namesp.patch
queue-6.12/ipv4-icmp-fill-flow-parameters-in-icmp_route_lookup-.patch
queue-6.12/i2c-davinci-unregister-cpufreq-notifier-on-probe-failure.patch
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