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linux/net/core
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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: 1da177e4c3 ("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.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
dev_addr_lists.c
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_ioctl.c net: Change the API of PHY default timestamp to MAC 2024-07-15 08:02:26 -07:00
drop_monitor.c net: add rx_sk to trace_kfree_skb 2024-06-19 12:44:22 +01:00
dst.c
dst_cache.c net: dst_cache: add two DEBUG_NET warnings 2024-06-03 18:50:09 -07:00
failover.c
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
gen_estimator.c net: use unrcu_pointer() helper 2024-06-06 11:52:52 +02:00
gen_stats.c
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
gro_cells.c
gso.c
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
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-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
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
netclassid_cgroup.c
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-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
page_pool.c page_pool: use __cacheline_group_{begin, end}_aligned() 2024-07-10 10:28:23 -07:00
page_pool_priv.h
page_pool_user.c
pktgen.c
ptp_classifier.c
request_sock.c
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
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.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2024-06-20 13:49:59 -07:00
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
stream.c
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
utils.c
xdp.c xdp: fix invalid wait context of page_pool_destroy() 2024-07-14 20:40:21 -07:00