Eric Dumazet 26f29b1491 net: fix backlog_unlock_irq_restore() vs CONFIG_PREEMPT_RT ...

CONFIG_PREEMPT_RT is special, make this clear in backlog_lock_irq_save()
and backlog_unlock_irq_restore().

The issue shows up with CONFIG_DEBUG_IRQFLAGS=y

raw_local_irq_restore() called with IRQs enabled
 WARNING: kernel/locking/irqflag-debug.c:10 at warn_bogus_irq_restore+0xc/0x20 kernel/locking/irqflag-debug.c:10, CPU#1: aoe_tx0/1321
Modules linked in:
CPU: 1 UID: 0 PID: 1321 Comm: aoe_tx0 Not tainted syzkaller #0 PREEMPT_{RT,(full)}
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026
 RIP: 0010:warn_bogus_irq_restore+0xc/0x20 kernel/locking/irqflag-debug.c:10
Call Trace:
 <TASK>
  backlog_unlock_irq_restore net/core/dev.c:253 [inline]
  enqueue_to_backlog+0x525/0xcf0 net/core/dev.c:5347
  netif_rx_internal+0x120/0x550 net/core/dev.c:5659
  __netif_rx+0xa9/0x110 net/core/dev.c:5679
  loopback_xmit+0x43a/0x660 drivers/net/loopback.c:90
  __netdev_start_xmit include/linux/netdevice.h:5275 [inline]
  netdev_start_xmit include/linux/netdevice.h:5284 [inline]
  xmit_one net/core/dev.c:3864 [inline]
  dev_hard_start_xmit+0x2df/0x830 net/core/dev.c:3880
  __dev_queue_xmit+0x16f4/0x3990 net/core/dev.c:4829
  dev_queue_xmit include/linux/netdevice.h:3384 [inline]

Fixes: 27a01c1969 ("net: fully inline backlog_unlock_irq_restore()")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Link: https://patch.msgid.link/20260213120427.2914544-1-edumazet@google.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

2026-02-17 13:28:10 +01:00

..

bpf_sk_storage.c

bpf: Switch to bpf_selem_unlink_nofail in bpf_local_storage_{map_free, destroy}

2026-02-06 14:47:59 -08:00

datagram.c

net: datagram: introduce datagram_poll_queue for custom receive queues

2025-10-23 15:46:04 +02:00

dev_addr_lists_test.c

net: dev_addr_lists: move locking out of init/exit in kunit

2024-04-15 10:26:35 +01:00

dev_addr_lists.c

net: s/dev_pre_changeaddr_notify/netif_pre_changeaddr_notify/

2025-07-18 17:27:47 -07:00

dev_api.c

net: define an enum for the napi threaded state

2025-07-24 18:34:55 -07:00

dev_ioctl.c

net: remove legacy way to get/set HW timestamp config

2026-01-20 18:21:27 -08:00

dev.c

net: fix backlog_unlock_irq_restore() vs CONFIG_PREEMPT_RT

2026-02-17 13:28:10 +01:00

dev.h

net: add queue config validation callback

2026-01-23 11:49:02 -08:00

devmem.c

net: inline net_is_devmem_iov()

2026-01-25 13:18:53 -08:00

devmem.h

net: inline net_is_devmem_iov()

2026-01-25 13:18:53 -08:00

drop_monitor.c

treewide, timers: Rename from_timer() to timer_container_of()

2025-06-08 09:07:37 +02:00

dst_cache.c

net: dst: annotate data-races around dst->obsolete

2025-07-02 14:32:29 -07:00

dst.c

dst: fix races in rt6_uncached_list_del() and rt_del_uncached_list()

2026-01-13 19:08:18 -08:00

failover.c

…

fib_notifier.c

net: do not acquire rtnl in fib_seq_sum()

2024-10-11 15:35:05 -07:00

fib_rules.c

Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net

2025-04-17 12:26:50 -07:00

filter.c

Merge tag 'bpf-next-7.0' of git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next

2026-02-10 11:26:21 -08:00

flow_dissector.c

net: remove '__' from __skb_flow_get_ports()

2025-02-24 14:27:53 -08:00

flow_offload.c

tc: flower: Enable offload support IPSEC SPI field.

2023-08-02 10:09:32 +01:00

gen_estimator.c

net_sched: gen_estimator: fix est_timer() vs CONFIG_PREEMPT_RT=y

2025-08-29 19:04:20 -07:00

gen_stats.c

…

gro_cells.c

net: gro_cells: Reduce lock scope in gro_cell_poll

2025-11-05 17:41:29 -08:00

gro.c

net/ipv6: Drop HBH for BIG TCP on RX side

2026-02-06 20:50:12 -08:00

gso.c

net: introduce struct net_hotdata

2024-03-07 21:12:41 -08:00

hotdata.c

net: add net.core.qdisc_max_burst

2026-01-13 10:12:11 +01:00

hwbm.c

…

ieee8021q_helpers.c

net: ieee8021q: fix insufficient table-size assertion

2025-07-01 12:55:49 +02:00

link_watch.c

linkwatch: use __dev_put() in callers to prevent UAF

2026-02-02 16:59:18 -08:00

lock_debug.c

netdev: fix the locking for netdev notifications

2025-04-17 18:55:14 -07:00

lwt_bpf.c

ipv4: Convert ->flowi4_tos to dscp_t.

2025-08-26 17:34:31 -07:00

lwtunnel.c

inet: Remove rtnl_is_held arg of lwtunnel_valid_encap_type(_attr)?().

2025-05-20 19:18:24 -07:00

Makefile

net: get rid of net/core/request_sock.c

2026-02-05 09:23:05 -08:00

mp_dmabuf_devmem.h

memory-provider: dmabuf devmem memory provider

2024-09-11 20:44:31 -07:00

neighbour.c

net: core: neighbour: Make another netlink notification atomically

2026-01-25 14:57:37 -08:00

net_namespace.c

netns: optimize netns cleaning by batching unhash_nsid calls

2026-02-06 20:01:31 -08:00

net_test.c

pfcp: always set pfcp metadata

2024-04-01 10:49:28 +01:00

net-procfs.c

net: add proper RCU protection to /proc/net/ptype

2026-02-03 19:20:30 -08:00

net-sysfs.c

net: Keep ignoring isolated cpuset change

2026-02-03 15:23:33 +01:00

net-sysfs.h

net: remove RTNL use for /proc/sys/net/core/rps_default_mask

2025-07-07 18:42:12 -07:00

net-traces.c

move asm/unaligned.h to linux/unaligned.h

2024-10-02 17:23:23 -04:00

netclassid_cgroup.c

net, bpf: Fix RCU usage in task_cls_state() for BPF programs

2025-06-11 21:30:29 +02:00

netdev_config.c

net: add queue config validation callback

2026-01-23 11:49:02 -08:00

netdev_queues.c

Revert "Merge branch 'netkit-support-for-io_uring-zero-copy-and-af_xdp'"

2026-01-20 18:06:01 -08:00

netdev_rx_queue.c

net: add queue config validation callback

2026-01-23 11:49:02 -08:00

netdev-genl-gen.c

Revert "Merge branch 'netkit-support-for-io_uring-zero-copy-and-af_xdp'"

2026-01-20 18:06:01 -08:00

netdev-genl-gen.h

Revert "Merge branch 'netkit-support-for-io_uring-zero-copy-and-af_xdp'"

2026-01-20 18:06:01 -08:00

netdev-genl.c

Revert "Merge branch 'netkit-support-for-io_uring-zero-copy-and-af_xdp'"

2026-01-20 18:06:01 -08:00

netevent.c

…

netmem_priv.h

netmem: replace __netmem_clear_lsb() with netmem_to_nmdesc()

2025-10-14 13:37:26 +02:00

netpoll.c

net: netpoll: initialize work queue before error checks

2025-11-28 20:16:57 -08:00

netprio_cgroup.c

…

of_net.c

…

page_pool_priv.h

net: page_pool: don't try to stash the napi id

2025-01-27 14:37:41 -08:00

page_pool_user.c

net: use napi_id_valid helper

2025-02-17 16:43:04 -08:00

page_pool.c

net: page_pool: sanitise allocation order

2025-12-02 11:08:39 -08:00

pktgen.c

net: pktgen: Use min()/min_t() to improve pktgen_finalize_skb()

2025-08-21 10:12:11 +02:00

ptp_classifier.c

…

rtnetlink.c

rtnetlink: honor RTEXT_FILTER_SKIP_STATS in IFLA_STATS

2025-11-04 16:07:37 -08:00

scm.c

scm: Convert put_cmsg() to scoped user access

2025-11-18 15:27:34 +01:00

secure_seq.c

net: Retire DCCP socket.

2025-04-11 18:58:10 -07:00

selftests.c

net: selftests: export packet creation helpers for driver use

2025-11-06 13:38:11 +01:00

skb_fault_injection.c

net: Implement fault injection forcing skb reallocation

2024-11-12 12:05:33 +01:00

skbuff.c

net: skb: allow up to 8 skb extension ids

2026-02-06 20:07:24 -08:00

skmsg.c

bpf, sockmap: Fix FIONREAD for sockmap

2026-01-27 09:11:30 -08:00

sock_destructor.h

…

sock_diag.c

net: WQ_PERCPU added to alloc_workqueue users

2025-09-22 17:40:30 -07:00

sock_map.c

bpf: Remove attach_type in sockmap_link

2025-07-11 10:51:55 -07:00

sock_reuseport.c

net: core: annotate socks of struct sock_reuseport with __counted_by

2024-08-02 17:16:59 -07:00

sock.c

tcp: reduce tcp sockets size by one cache line

2026-01-30 17:15:51 -08:00

stream.c

net: stream: add description for sk_stream_write_space()

2025-07-18 16:57:21 -07:00

sysctl_net_core.c

net: include <linux/hex.h> from sysctl_net_core.c

2026-01-26 16:35:53 -08:00

timestamping.c

net: Add the possibility to support a selected hwtstamp in netdevice

2024-12-16 12:51:40 +00:00

tso.c

move asm/unaligned.h to linux/unaligned.h

2024-10-02 17:23:23 -04:00

utils.c

net: Fix checksum update for ILA adj-transport

2025-05-30 19:53:51 -07:00

xdp.c

bpf: Remove redundant KF_TRUSTED_ARGS flag from all kfuncs

2026-01-02 12:04:28 -08:00