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c8591decd9dbf395cb8ae398e70b0438fdd24aee
linux/include/net
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Jakub Kicinski 006a5035b4 inet: frags: flush pending skbs in fqdir_pre_exit() 
We have been seeing occasional deadlocks on pernet_ops_rwsem since
September in NIPA. The stuck task was usually modprobe (often loading
a driver like ipvlan), trying to take the lock as a Writer.
lockdep does not track readers for rwsems so the read wasn't obvious
from the reports.

On closer inspection the Reader holding the lock was conntrack looping
forever in nf_conntrack_cleanup_net_list(). Based on past experience
with occasional NIPA crashes I looked thru the tests which run before
the crash and noticed that the crash follows ip_defrag.sh. An immediate
red flag. Scouring thru (de)fragmentation queues reveals skbs sitting
around, holding conntrack references.

The problem is that since conntrack depends on nf_defrag_ipv6,
nf_defrag_ipv6 will load first. Since nf_defrag_ipv6 loads first its
netns exit hooks run _after_ conntrack's netns exit hook.

Flush all fragment queue SKBs during fqdir_pre_exit() to release
conntrack references before conntrack cleanup runs. Also flush
the queues in timer expiry handlers when they discover fqdir->dead
is set, in case packet sneaks in while we're running the pre_exit
flush.

The commit under Fixes is not exactly the culprit, but I think
previously the timer firing would eventually unblock the spinning
conntrack.

Fixes: d5dd88794a ("inet: fix various use-after-free in defrags units")
Reviewed-by: Eric Dumazet <edumazet@google.com>
Link: https://patch.msgid.link/20251207010942.1672972-4-kuba@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2025-12-10 01:15:27 -08:00
..
9p
netfs, 9p: Implement helpers for new write code
2024-05-01 18:07:37 +01:00
bluetooth
Bluetooth: HCI: Add support for LL Extended Feature Set
2025-12-01 16:21:16 -05:00
caif
caif: Remove unused cfsrvl_getphyid
2024-10-08 15:33:49 -07:00
iucv
net: reformat kdoc return statements
2024-12-09 14:44:59 -08:00
libeth
libeth: xdp: Disable generic kCFI pass for libeth_xdp_tx_xmit_bulk()
2025-10-29 20:04:55 -07:00
mana
net: mana: Handle hardware recovery events when probing the device
2025-12-01 13:53:53 -08:00
netfilter
netfilter: nf_conncount: rework API to use sk_buff directly
2025-11-28 00:05:49 +00:00
netns
tcp: add net.ipv4.tcp_rcvbuf_low_rtt
2025-11-20 17:44:23 -08:00
nfc
net: nfc: nci: Increase NCI_DATA_TIMEOUT to 3000 ms
2025-09-03 17:02:12 -07:00
page_pool
net: add helper to pre-check if PP for an Rx queue will be unreadable
2025-09-04 10:19:17 +02:00
phonet
phonet: Convert phonet_routes.lock to spinlock_t.
2024-10-24 16:03:40 +02:00
psp
psp: add stats from psp spec to driver facing api
2025-11-07 18:53:57 -08:00
sctp
sctp: Remove unused declaration sctp_auth_init_hmacs()
2025-11-14 18:00:34 -08:00
tc_act
net_sched: act_skbmod: use RCU in tcf_skbmod_dump()
2025-08-28 16:46:23 -07:00
6lowpan.h
…
act_api.h
net_sched: act: remove tcfa_qstats
2025-09-02 15:52:24 -07:00
addrconf.h
ipv6: Add in6_dev_rcu().
2025-11-03 17:40:46 -08:00
af_ieee802154.h
…
af_rxrpc.h
rxrpc: Remove deadcode
2025-04-24 17:03:45 -07:00
af_unix.h
af_unix: Introduce SO_INQ.
2025-07-08 18:05:25 -07:00
af_vsock.h
vsock: fix vsock_proto declaration
2025-07-07 16:55:54 -07:00
ah.h
…
aligned_data.h
udp: move udp_memory_allocated into net_aligned_data
2025-07-02 14:22:02 -07:00
amt.h
…
arp.h
neighbour: switch to standard rcu, instead of rcu_bh
2023-03-21 21:32:18 -07:00
atmclip.h
…
ax25.h
ax25: Remove broken autobind
2025-03-24 10:26:53 +00:00
ax88796.h
…
bareudp.h
…
bond_3ad.h
bonding: support aggregator selection based on port priority
2025-09-09 10:56:02 +02:00
bond_alb.h
bonding: Correct spelling in headers
2024-08-26 09:37:22 -07:00
bond_options.h
bonding: add support for per-port LACP actor priority
2025-09-09 10:56:02 +02:00
bonding.h
Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net
2025-10-01 10:14:49 +02:00
bpf_sk_storage.h
…
busy_poll.h
net: gro: decouple GRO from the NAPI layer
2025-02-27 14:03:14 +01:00
calipso.h
move asm/unaligned.h to linux/unaligned.h
2024-10-02 17:23:23 -04:00
cfg80211-wext.h
…
cfg80211.h
wifi: cfg80211: include s1g_primary_2mhz when comparing chandefs
2025-11-25 10:31:28 +01:00
cfg802154.h
mac802154: fix llsec key resources release in mac802154_llsec_key_del
2024-03-06 21:01:26 +01:00
checksum.h
net: Fix checksum update for ILA adj-transport
2025-05-30 19:53:51 -07:00
cipso_ipv4.h
move asm/unaligned.h to linux/unaligned.h
2024-10-02 17:23:23 -04:00
cls_cgroup.h
net/cls_cgroup: Fix task_get_classid() during qdisc run
2025-09-14 11:55:04 -07:00
codel_impl.h
…
codel_qdisc.h
…
codel.h
codel: fix kernel-doc notation warnings
2023-07-14 20:39:29 -07:00
compat.h
…
datalink.h
net: datalink: Remove unused declarations
2023-07-27 17:17:32 -07:00
dcbevent.h
…
dcbnl.h
net: dcb: add helper functions to retrieve PCP and DSCP rewrite maps
2023-01-20 09:33:22 +00:00
devlink.h
devlink: support default values for param-get and param-set
2025-11-20 19:01:22 -08:00
dropreason-core.h
tcp: add datapath logic for PSP with inline key exchange
2025-09-18 12:32:06 +02:00
dropreason.h
wifi: mac80211: Drop cooked monitor support
2025-02-11 11:58:17 +01:00
dsa_stubs.h
net: dsa: Use conduit and user terms
2023-10-24 13:08:14 -07:00
dsa.h
net: dsa: add simple HSR offload helpers
2025-12-01 16:45:07 -08:00
dscp.h
net: add IEEE 802.1q specific helpers
2024-05-08 10:35:09 +01:00
dsfield.h
…
dst_cache.h
net: Correct spelling in headers
2024-08-26 09:37:23 -07:00
dst_metadata.h
net: dst_metadata: fix IP_DF bit not extracted from tunnel headers
2025-09-14 14:28:12 -07:00
dst_ops.h
net: fix __dst_negative_advice() race
2024-05-29 17:34:49 -07:00
dst.h
net: dst: introduce dst->dev_rcu
2025-08-29 19:36:31 -07:00
eee.h
net: simplify eeecfg_mac_can_tx_lpi
2024-11-13 18:49:50 -08:00
erspan.h
net: Correct spelling in headers
2024-08-26 09:37:23 -07:00
esp.h
…
espintcp.h
inet: preserve const qualifier in inet_csk()
2024-04-01 21:27:08 -07:00
ethoc.h
…
failover.h
…
fib_notifier.h
net: do not acquire rtnl in fib_seq_sum()
2024-10-11 15:35:05 -07:00
fib_rules.h
net: fib_rules: Fix iif / oif matching on L3 master device
2025-04-15 17:54:56 -07:00
firewire.h
…
flow_dissector.h
flow_dissector: cleanup FLOW_DISSECTOR_KEY_ENC_FLAGS
2024-07-15 09:14:39 -07:00
flow_offload.h
net: sched: propagate "skip_sw" flag to struct flow_cls_common_offload
2024-10-30 17:33:53 -07:00
flow.h
ipv4: Convert ->flowi4_tos to dscp_t.
2025-08-26 17:34:31 -07:00
fou.h
bpf,fou: Add bpf_skb_{set,get}_fou_encap kfuncs
2023-04-12 16:40:39 -07:00
fq_impl.h
…
fq.h
net: fq: Remove unused typedef fq_flow_get_default_t
2023-08-08 15:58:23 -07:00
garp.h
…
gen_stats.h
…
genetlink.h
genetlink: fix typo in comment
2025-09-03 15:16:49 -07:00
geneve.h
…
gre.h
ip_tunnel: convert __be16 tunnel flags to bitmaps
2024-04-01 10:49:28 +01:00
gro_cells.h
…
gro.h
tcp: gro: inline tcp_gro_pull_header()
2025-11-14 18:00:08 -08:00
gso.h
net: move gso declarations and functions to their own files
2023-06-10 00:11:41 -07:00
gtp.h
gtp: properly parse extension headers
2024-05-07 01:35:55 +02:00
gue.h
…
handshake.h
net/handshake: Add helpers for parsing incoming TLS Alerts
2023-07-28 14:07:59 -07:00
hotdata.h
net: add NUMA awareness to skb_attempt_defer_free()
2025-09-30 15:45:53 +02:00
hwbm.h
net: Correct spelling in headers
2024-08-26 09:37:23 -07:00
icmp.h
ipv4: icmp: Pass IPv4 control block structure as an argument to __icmp_send()
2025-09-11 12:22:38 +02:00
ieee8021q.h
net: add IEEE 802.1q specific helpers
2024-05-08 10:35:09 +01:00
ieee80211_radiotap.h
wifi: mac80211: add RX flag to report radiotap VHT information
2025-10-30 08:38:51 +01:00
ieee802154_netdev.h
mac802154: Handle association requests from peers
2023-11-20 11:43:03 +01:00
if_inet6.h
ipv6: anycast: complete RCU handling of struct ifacaddr6
2024-02-26 18:40:34 -08:00
ife.h
…
inet6_connection_sock.h
tcp/dccp: Remove inet_connection_sock_af_ops.addr2sockaddr().
2025-03-24 12:10:13 -07:00
inet6_hashtables.h
tcp: Remove inet6_hash().
2025-09-22 11:38:43 -07:00
inet_common.h
net: Convert proto callbacks from sockaddr to sockaddr_unsized
2025-11-04 19:10:33 -08:00
inet_connection_sock.h
tcp: remove icsk->icsk_retransmit_timer
2025-11-25 19:28:29 -08:00
inet_dscp.h
ipv4: Convert ->flowi4_tos to dscp_t.
2025-08-26 17:34:31 -07:00
inet_ecn.h
…
inet_frag.h
inet: frags: flush pending skbs in fqdir_pre_exit()
2025-12-10 01:15:27 -08:00
inet_hashtables.h
tcp: Update bind bucket state on port release
2025-09-23 10:12:15 +02:00
inet_sock.h
sctp: Remove sctp_copy_sock() and sctp_copy_descendant().
2025-10-27 18:04:59 -07:00
inet_timewait_sock.h
tcp: Update bind bucket state on port release
2025-09-23 10:12:15 +02:00
inetpeer.h
inetpeer: remove create argument of inet_getpeer()
2024-12-17 19:37:00 -08:00
ioam6.h
net: ioam6: multicast event
2024-02-28 11:19:41 +00:00
ip6_checksum.h
…
ip6_fib.h
ipv6: Defer fib6_purge_rt() in fib6_add_rt2node() to fib6_add().
2025-04-24 09:29:56 +02:00
ip6_route.h
ipv6: make ipv6_pinfo.daddr_cache a boolean
2025-09-18 10:17:09 +02:00
ip6_tunnel.h
ipv6: adopt skb_dst_dev() and skb_dst_dev_net[_rcu]() helpers
2025-07-02 14:32:30 -07:00
ip_fib.h
ipv4: Convert ->flowi4_tos to dscp_t.
2025-08-26 17:34:31 -07:00
ip_tunnels.h
net/ip6_tunnel: Prevent perpetual tunnel growth
2025-10-13 17:43:46 -07:00
ip_vs.h
ipvs: Fix estimator kthreads preferred affinity
2025-08-13 08:34:33 +02:00
ip.h
net: Convert proto callbacks from sockaddr to sockaddr_unsized
2025-11-04 19:10:33 -08:00
ipcomp.h
xfrm: ipcomp: Use crypto_acomp interface
2025-03-21 17:36:49 +08:00
ipconfig.h
…
ipv6_frag.h
inet: frags: flush pending skbs in fqdir_pre_exit()
2025-12-10 01:15:27 -08:00
ipv6_stubs.h
net: Convert proto callbacks from sockaddr to sockaddr_unsized
2025-11-04 19:10:33 -08:00
ipv6.h
net: Convert proto callbacks from sockaddr to sockaddr_unsized
2025-11-04 19:10:33 -08:00
iw_handler.h
Revert "wifi: cfg80211: unexport wireless_nlevent_flush()"
2024-10-09 08:53:01 +02:00
kcm.h
net: kcm: Fix race condition in kcm_unattach()
2025-08-13 18:18:33 -07:00
l3mdev.h
net: fib_rules: Fix iif / oif matching on L3 master device
2025-04-15 17:54:56 -07:00
lag.h
…
lapb.h
net: lapb: increase LAPB_HEADER_LEN
2024-12-06 17:43:08 -08:00
llc_c_ac.h
net: llc: Remove unused function declarations
2023-08-04 15:33:17 -07:00
llc_c_ev.h
net: llc: Remove unused function declarations
2023-08-04 15:33:17 -07:00
llc_c_st.h
llc: Constify struct llc_conn_state_trans
2024-07-15 08:51:01 -07:00
llc_conn.h
llc: Check netns in llc_estab_match() and llc_listener_match().
2023-07-20 10:46:28 +02:00
llc_if.h
…
llc_pdu.h
net: Correct spelling in headers
2024-08-26 09:37:23 -07:00
llc_s_ac.h
…
llc_s_ev.h
…
llc_s_st.h
llc: Constify struct llc_sap_state_trans
2024-07-15 08:51:19 -07:00
llc_sap.h
…
llc.h
…
lwtunnel.h
net: dst: annotate data-races around dst->output
2025-07-02 14:32:30 -07:00
mac80211.h
wifi: mac80211: fix EHT typo
2025-11-10 10:38:37 +01:00
mac802154.h
move asm/unaligned.h to linux/unaligned.h
2024-10-02 17:23:23 -04:00
macsec.h
net: macsec: Add endianness annotations in salt struct
2025-01-20 12:20:42 +00:00
mctp.h
net: mctp: Allow limiting binds to a peer address
2025-07-15 12:08:39 +02:00
mctpdevice.h
net: mctp: Expose transport binding identifier via IFLA attribute
2024-11-09 09:04:54 -08:00
mip6.h
…
mld.h
…
mpls_iptunnel.h
…
mpls.h
…
mptcp.h
mptcp: sched: remove mptcp_sched_data
2025-04-15 08:21:46 -07:00
mrp.h
…
ncsi.h
…
ndisc.h
net: replace ND_PRINTK with dynamic debug
2025-07-10 15:27:32 -07:00
neighbour_tables.h
neighbour: Create netdev->neighbour association
2024-11-09 13:22:57 -08:00
neighbour.h
neighbour: Convert rwlock of struct neigh_table to spinlock.
2025-10-24 17:57:20 -07:00
net_debug.h
Merge tag 'kbuild-v6.13' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild
2024-11-30 13:41:50 -08:00
net_failover.h
…
net_namespace.h
Merge tag 'namespace-6.18-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
2025-09-29 11:20:29 -07:00
net_ratelimit.h
…
net_shaper.h
net-shapers: implement NL get operation
2024-10-10 08:30:22 -07:00
net_trackers.h
…
netdev_lock.h
Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net
2025-05-22 09:42:41 -07:00
netdev_netlink.h
net: add granular lock for the netdev netlink socket
2025-03-12 13:32:35 -07:00
netdev_queues.h
net: add helper to pre-check if PP for an Rx queue will be unreadable
2025-09-04 10:19:17 +02:00
netdev_rx_queue.h
net: designate XSK pool pointers in queues as "ops protected"
2025-04-09 17:01:51 -07:00
netevent.h
…
netkit.h
bpf, netkit: Add indirect call wrapper for fetching peer dev
2023-11-20 10:15:16 -08:00
netlabel.h
Merge tag 'net-next-6.13' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next
2024-11-21 08:28:08 -08:00
netlink.h
netlink: introduce type-checking attribute iteration for nlmsg
2025-07-02 15:39:04 -07:00
netmem.h
net: netmem: remove NET_IOV_MAX from net_iov_type enum
2025-10-28 17:41:46 -07:00
netprio_cgroup.h
…
netrom.h
…
nexthop.h
ipv6: Protect nh->f6i_list with spinlock and flag.
2025-04-24 09:29:56 +02:00
nl802154.h
nl802154: fix some kernel-doc warnings
2025-10-20 17:13:40 -07:00
nsh.h
net: NSH: fix kernel-doc notation warning
2023-07-14 20:39:29 -07:00
pfcp.h
net: pfcp: fix typo in message_priority field name
2025-06-13 18:17:08 -07:00
pie.h
pie: fix kernel-doc notation warning
2023-07-14 20:39:30 -07:00
ping.h
net: Convert proto callbacks from sockaddr to sockaddr_unsized
2025-11-04 19:10:33 -08:00
pkt_cls.h
net: sched: fix TCF_LAYER_TRANSPORT handling in tcf_get_base_ptr()
2025-11-24 18:53:14 -08:00
pkt_sched.h
net_sched: add qdisc_dequeue_drop() helper
2025-11-25 16:10:32 +01:00
pptp.h
…
proto_memory.h
net: Allow opt-out from global protocol memory accounting.
2025-10-16 12:04:47 -07:00
protocol.h
ipv6: move tcp_ipv6_hash_secret and udp_ipv6_hash_secret to net_hotdata
2024-03-07 21:12:43 -08:00
psample.h
net: psample: fix flag being set in wrong skb
2024-07-11 18:11:31 -07:00
psnap.h
…
psp.h
psp: base PSP device support
2025-09-18 12:32:06 +02:00
raw.h
net: use NUMA drop counters for softnet_data.dropped
2025-09-14 11:35:17 -07:00
rawv6.h
ipv6: raw: constify raw_v6_match() socket argument
2023-03-17 08:56:37 +00:00
red.h
net: sched: Correct spelling in headers
2024-08-26 09:37:23 -07:00
regulatory.h
net: Correct spelling in headers
2024-08-26 09:37:23 -07:00
request_sock.h
tcp: Call tcp_syn_ack_timeout() directly.
2025-11-07 18:05:25 -08:00
rose.h
net: rose: convert 'use' field to refcount_t
2025-08-27 07:43:08 -07:00
route.h
net: use dst_dev_rcu() in sk_setup_caps()
2025-08-29 19:36:32 -07:00
rpl.h
ipv6: rpl: Remove pskb(_may)?_pull() in ipv6_rpl_srh_rcv().
2023-06-19 11:32:58 -07:00
rps.h
net: Add rfs_needed() helper
2025-09-03 15:08:20 -07:00
rsi_91x.h
rsi: remove kernel-doc comment marker
2023-07-14 20:39:30 -07:00
rstreason.h
net: Retire DCCP socket.
2025-04-11 18:58:10 -07:00
rtnetlink.h
rtnetlink: Remove "net" from newlink params
2025-02-21 15:28:03 -08:00
rtnh.h
…
sch_generic.h
net_sched: add qdisc_dequeue_drop() helper
2025-11-25 16:10:32 +01:00
scm.h
af_unix/scm: fix whitespace errors
2025-07-04 09:32:35 +02:00
secure_seq.h
net: Retire DCCP socket.
2025-04-11 18:58:10 -07:00
seg6_hmac.h
ipv6: sr: Prepare HMAC key ahead of time
2025-08-26 18:11:29 -07:00
seg6_local.h
seg6: Use nested-BH locking for seg6_bpf_srh_states.
2024-06-24 16:41:23 -07:00
seg6.h
ipv6: sr: restruct ifdefines
2024-05-30 18:29:38 -07:00
selftests.h
net: selftests: export packet creation helpers for driver use
2025-11-06 13:38:11 +01:00
slhc_vj.h
…
smc.h
net/smc: bpf: Introduce generic hook for handshake flow
2025-11-10 11:19:41 -08:00
snmp.h
net: snmp: remove SNMP_MIB_SENTINEL
2025-09-08 18:06:21 -07:00
sock_reuseport.h
net: core: annotate socks of struct sock_reuseport with __counted_by
2024-08-02 17:16:59 -07:00
sock.h
tcp: remove icsk->icsk_retransmit_timer
2025-11-25 19:28:29 -08:00
Space.h
net: appletalk: remove cops support
2023-10-04 11:49:20 -07:00
stp.h
…
strparser.h
strparser: Remove unused __strp_unpause
2025-05-05 16:48:12 -07:00
switchdev.h
net: bridge: switchdev: Skip MDB replays of deferred events on offload
2024-02-16 09:36:37 +00:00
tc_wrapper.h
Merge branch 'x86/bugs' into x86/core, to pick up pending changes before dependent patches
2024-02-14 10:49:37 +01:00
tcp_ao.h
tcp: Free TCP-AO/TCP-MD5 info/keys without RCU
2025-09-11 19:05:56 -07:00
tcp_ecn.h
tcp: accecn: AccECN option failure handling
2025-09-18 08:47:52 +02:00
tcp_states.h
tcp: Dump bound-only sockets in inet_diag.
2023-12-04 14:45:26 -08:00
tcp.h
tcp: gro: inline tcp_gro_pull_header()
2025-11-14 18:00:08 -08:00
tcx.h
bpf: Remove location field in tcx_link
2025-07-11 11:00:57 -07:00
timewait_sock.h
tcp: Remove timewait_sock_ops.twsk_destructor().
2025-08-25 17:53:35 -07:00
tipc.h
…
tls_prot.h
net/tls: Add TLS Alert definitions
2023-07-28 14:07:59 -07:00
tls_toe.h
…
tls.h
Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net
2025-10-31 06:46:03 -07:00
transp_v6.h
inet6: Remove unused function declaration udpv6_connect()
2023-08-01 15:06:27 -07:00
tso.h
…
tun_proto.h
…
udp_tunnel.h
udp_tunnel: fix deadlock in udp_tunnel_nic_set_port_priv()
2025-06-24 16:31:36 -07:00
udp.h
net: Convert proto callbacks from sockaddr to sockaddr_unsized
2025-11-04 19:10:33 -08:00
udplite.h
udplite: fix various data-races
2023-09-14 16:16:36 +02:00
vsock_addr.h
net: Convert proto_ops connect() callbacks to use sockaddr_unsized
2025-11-04 19:10:32 -08:00
vxlan.h
vxlan: Support MC routing in the underlay
2025-06-17 18:18:46 -07:00
wext.h
…
x25.h
net/x25: Remove unused x25_terminate_link()
2025-07-14 17:19:13 -07:00
x25device.h
…
xdp_priv.h
…
xdp_sock_drv.h
xsk: Move NETDEV_XDP_ACT_ZC into generic header
2025-11-06 16:46:11 -08:00
xdp_sock.h
xsk: add indirect call for xsk_destruct_skb
2025-11-11 10:21:08 +01:00
xdp.h
Merge tag 'for-netdev' of https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next
2025-09-24 10:22:37 -07:00
xfrm.h
xfrm: Determine inner GSO type from packet inner protocol
2025-10-30 11:52:31 +01:00
xsk_buff_pool.h
xsk: use a smaller new lock for shared pool case
2025-11-04 16:10:53 +01:00