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Eric Dumazet 3e7917c0cd net: linkwatch: use system_unbound_wq 
linkwatch_event() grabs possibly very contended RTNL mutex.

system_wq is not suitable for such work.

Inspired by many noisy syzbot reports.

3 locks held by kworker/0:7/5266:
 #0: ffff888015480948 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3206 [inline]
 #0: ffff888015480948 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0x90a/0x1830 kernel/workqueue.c:3312
 #1: ffffc90003f6fd00 ((linkwatch_work).work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3207 [inline]
 , at: process_scheduled_works+0x945/0x1830 kernel/workqueue.c:3312
 #2: ffffffff8fa6f208 (rtnl_mutex){+.+.}-{3:3}, at: linkwatch_event+0xe/0x60 net/core/link_watch.c:276

Reported-by: syzbot <syzkaller@googlegroups.com>
Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Link: https://patch.msgid.link/20240805085821.1616528-1-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2024-08-06 12:12:53 -07:00
..
bpf_sk_storage.c
netlink: introduce type-checking attribute iteration
2024-03-29 15:06:02 -07:00
datagram.c
Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net
2024-07-11 12:58:13 -07:00
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
…
dev_ioctl.c
net: Change the API of PHY default timestamp to MAC
2024-07-15 08:02:26 -07:00
dev.c
tun: Add missing bpf_net_ctx_clear() in do_xdp_generic()
2024-07-29 10:55:15 +01:00
dev.h
net: softnet_data: Make xmit per task.
2024-06-24 16:41:23 -07:00
drop_monitor.c
net: add rx_sk to trace_kfree_skb
2024-06-19 12:44:22 +01:00
dst_cache.c
net: dst_cache: add two DEBUG_NET warnings
2024-06-03 18:50:09 -07:00
dst.c
net: dst: Make dst_destroy() static and return void.
2024-02-06 11:45:53 +01:00
failover.c
net: failover: use IFF_NO_ADDRCONF flag to prevent ipv6 addrconf
2022-12-12 15:18:25 -08:00
fib_notifier.c
…
fib_rules.c
fib: rules: no longer hold RTNL in fib_nl_dumprule()
2024-04-12 19:09:31 -07:00
filter.c
bpf: Fix a segment issue when downgrading gso_size
2024-07-25 11:50:14 +02:00
flow_dissector.c
net: flow_dissector: use DEBUG_NET_WARN_ON_ONCE
2024-07-18 10:52:17 +02:00
flow_offload.c
tc: flower: Enable offload support IPSEC SPI field.
2023-08-02 10:09:32 +01:00
gen_estimator.c
net: use unrcu_pointer() helper
2024-06-06 11:52:52 +02:00
gen_stats.c
net: Remove the obsolte u64_stats_fetch_*_irq() users (net).
2022-10-28 20:13:54 -07:00
gro_cells.c
net: move netdev_max_backlog to net_hotdata
2024-03-07 21:12:42 -08:00
gro.c
net: gro: move L3 flush checks to tcp_gro_receive and udp_gro_receive_segment
2024-05-13 14:44:06 -07:00
gso.c
net: introduce struct net_hotdata
2024-03-07 21:12:41 -08:00
hotdata.c
net: move sysctl_mem_pcpu_rsv to net_hotdata
2024-04-30 18:46:52 -07:00
hwbm.c
…
ieee8021q_helpers.c
net: add IEEE 802.1q specific helpers
2024-05-08 10:35:09 +01:00
link_watch.c
net: linkwatch: use system_unbound_wq
2024-08-06 12:12:53 -07:00
lwt_bpf.c
net: Reference bpf_redirect_info via task_struct on PREEMPT_RT.
2024-06-24 16:41:24 -07:00
lwtunnel.c
xfrm: lwtunnel: squelch kernel warning in case XFRM encap type is not available
2022-10-12 10:45:51 +02:00
Makefile
net: add IEEE 802.1q specific helpers
2024-05-08 10:35:09 +01:00
neighbour.c
sysctl: treewide: constify the ctl_table argument of proc_handlers
2024-07-24 20:59:29 +02:00
net_namespace.c
netns: Make get_net_ns() handle zero refcount net
2024-06-18 10:59:52 +02:00
net_test.c
pfcp: always set pfcp metadata
2024-04-01 10:49:28 +01:00
net-procfs.c
net: make softnet_data.dropped an atomic_t
2024-04-01 11:28:32 +01:00
net-sysfs.c
netdevice: define and allocate &net_device _properly_
2024-07-11 18:11:31 -07:00
net-sysfs.h
…
net-traces.c
udp6: add a missing call into udp_fail_queue_rcv_skb tracepoint
2023-07-07 09:16:52 +01:00
netclassid_cgroup.c
cgroup, netclassid: on modifying netclassid in cgroup, only consider the main process.
2023-10-16 16:36:53 -07:00
netdev-genl-gen.c
netdev: support dumping a single netdev in qstats
2024-04-23 10:09:49 -07:00
netdev-genl-gen.h
netdev: add per-queue statistics
2024-03-07 21:13:25 -08:00
netdev-genl.c
netdev-genl: fix error codes when outputting XDP features
2024-06-14 18:04:29 -07:00
netevent.c
…
netpoll.c
netpoll: Fix race condition in netpoll_owner_active
2024-04-30 19:03:47 -07:00
netprio_cgroup.c
…
of_net.c
net: Explicitly include correct DT includes
2023-07-27 20:33:16 -07:00
page_pool_priv.h
net: page_pool: report when page pool was destroyed
2023-11-28 15:48:39 +01:00
page_pool_user.c
Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net
2024-03-07 10:29:36 -08:00
page_pool.c
page_pool: use __cacheline_group_{begin, end}_aligned()
2024-07-10 10:28:23 -07:00
pktgen.c
net: pktgen: Use wait_event_freezable_timeout() for freezable kthread
2023-12-27 14:34:52 +00:00
ptp_classifier.c
…
request_sock.c
tcp: make sure init the accept_queue's spinlocks once
2024-01-19 21:13:25 -08:00
rtnetlink.c
rtnetlink: Don't ignore IFLA_TARGET_NETNSID when ifname is specified in rtnl_dellink().
2024-07-29 11:36:48 +01:00
scm.c
af_unix: Add dead flag to struct scm_fp_list.
2024-05-10 18:52:45 -07:00
secure_seq.c
…
selftests.c
net: fill in MODULE_DESCRIPTION()s under net/core
2023-10-28 11:29:27 +01:00
skbuff.c
page_pool: convert to use netmem
2024-07-02 18:59:33 -07:00
skmsg.c
skmsg: Skip zero length skb in sk_msg_recvmsg
2024-07-09 10:24:50 +02:00
sock_destructor.h
…
sock_diag.c
net: use unrcu_pointer() helper
2024-06-06 11:52:52 +02:00
sock_map.c
sock_map: avoid race between sock_map_close and sk_psock_put
2024-05-28 12:05:19 +02:00
sock_reuseport.c
soreuseport: Fix socket selection for SO_INCOMING_CPU.
2022-10-25 11:35:16 +02:00
sock.c
Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net
2024-06-20 13:49:59 -07:00
stream.c
net: Return error from sk_stream_wait_connect() if sk_wait_event() fails
2023-12-15 10:48:51 +00:00
sysctl_net_core.c
sysctl: treewide: constify the ctl_table argument of proc_handlers
2024-07-24 20:59:29 +02:00
timestamping.c
net: Change the API of PHY default timestamp to MAC
2024-07-15 08:02:26 -07:00
tso.c
net: tso: inline tso_count_descs()
2022-12-12 15:04:39 -08:00
utils.c
net: core: inet[46]_pton strlen len types
2022-11-01 21:14:39 -07:00
xdp.c
xdp: fix invalid wait context of page_pool_destroy()
2024-07-14 20:40:21 -07:00