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linux-yocto/net/core
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Eric Dumazet a22ec2ee82 net_sched: gen_estimator: fix est_timer() vs CONFIG_PREEMPT_RT=y 
[ Upstream commit 9f74c0ea9b26d1505d55b61e36b1623dd347e1d1 ]

syzbot reported a WARNING in est_timer() [1]

Problem here is that with CONFIG_PREEMPT_RT=y, timer callbacks
can be preempted.

Adopt preempt_disable_nested()/preempt_enable_nested() to fix this.

[1]
 WARNING: CPU: 0 PID: 16 at ./include/linux/seqlock.h:221 __seqprop_assert include/linux/seqlock.h:221 [inline]
 WARNING: CPU: 0 PID: 16 at ./include/linux/seqlock.h:221 est_timer+0x6dc/0x9f0 net/core/gen_estimator.c:93
Modules linked in:
CPU: 0 UID: 0 PID: 16 Comm: ktimers/0 Not tainted syzkaller #0 PREEMPT_{RT,(full)}
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
 RIP: 0010:__seqprop_assert include/linux/seqlock.h:221 [inline]
 RIP: 0010:est_timer+0x6dc/0x9f0 net/core/gen_estimator.c:93
Call Trace:
 <TASK>
  call_timer_fn+0x17e/0x5f0 kernel/time/timer.c:1747
  expire_timers kernel/time/timer.c:1798 [inline]
  __run_timers kernel/time/timer.c:2372 [inline]
  __run_timer_base+0x648/0x970 kernel/time/timer.c:2384
  run_timer_base kernel/time/timer.c:2393 [inline]
  run_timer_softirq+0xb7/0x180 kernel/time/timer.c:2403
  handle_softirqs+0x22c/0x710 kernel/softirq.c:579
  __do_softirq kernel/softirq.c:613 [inline]
  run_ktimerd+0xcf/0x190 kernel/softirq.c:1043
  smpboot_thread_fn+0x53f/0xa60 kernel/smpboot.c:160
  kthread+0x70e/0x8a0 kernel/kthread.c:463
  ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148
  ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>

Fixes: d2d6422f8b ("x86: Allow to enable PREEMPT_RT.")
Reported-by: syzbot+72db9ee39db57c3fecc5@syzkaller.appspotmail.com
Closes: https://lore.kernel.org/netdev/68adf6fa.a70a0220.3cafd4.0000.GAE@google.com/T/#u
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Link: https://patch.msgid.link/20250827162352.3960779-1-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2025-09-09 18:58:07 +02:00
..
bpf_sk_storage.c netlink: introduce type-checking attribute iteration 2024-03-29 15:06:02 -07:00
datagram.c net: add support for skbs with unreadable frags 2024-09-11 20:44:31 -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 net: Correct spelling in net/core 2024-08-26 09:37:23 -07:00
dev_ioctl.c netdevice: convert private flags > BIT(31) to bitfields 2024-09-03 11:36:43 +02:00
dev.c net: gso: Forbid IPv6 TSO with extensions on devices with only IPV6_CSUM 2025-08-28 16:31:14 +02:00
dev.h net: page_pool: avoid false positive warning if NAPI was never added 2025-05-29 11:02:59 +02:00
devmem.c net: devmem: do not WARN conditionally after netdev_rx_queue_restart() 2025-04-10 14:39:31 +02:00
devmem.h tcp: RX path for devmem TCP 2024-09-11 20:44:32 -07:00
drop_monitor.c drop_monitor: fix incorrect initialization order 2025-02-27 04:30:21 -08:00
dst_cache.c net: dst_cache: add two DEBUG_NET warnings 2024-06-03 18:50:09 -07:00
dst.c net: dst: annotate data-races around dst->output 2025-08-15 12:13:41 +02:00
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 net: fib_rules: annotate data-races around rule->[io]ifindex 2025-02-21 14:01:16 +01:00
filter.c bpf: Check flow_dissector ctx accesses are aligned 2025-08-15 12:13:58 +02:00
flow_dissector.c flow_dissector: Fix port range key handling in BPF conversion 2025-02-27 04:30:18 -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 2025-09-09 18:58:07 +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: Clear old fragment checksum value in napi_reuse_skb 2025-03-07 18:25:33 +01:00
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: ieee8021q: fix insufficient table-size assertion 2025-08-20 18:30:34 +02:00
link_watch.c ipvlan: Fix use-after-free in ipvlan_get_iflink(). 2025-01-17 13:40:39 +01:00
lwt_bpf.c bpf: lwtunnel: Unmask upper DSCP bits in bpf_lwt_xmit_reroute() 2024-09-09 14:14:52 +01:00
lwtunnel.c net: lwtunnel: disable BHs when required 2025-05-02 07:59:01 +02:00
Makefile netdev: support binding dma-buf to netdevice 2024-09-11 20:44:31 -07:00
mp_dmabuf_devmem.h memory-provider: dmabuf devmem memory provider 2024-09-11 20:44:31 -07:00
neighbour.c neighbour: add support for NUD_PERMANENT proxy entries 2025-08-20 18:30:37 +02:00
net_namespace.c net: Add net_passive_inc() and net_passive_dec(). 2025-08-20 18:30:56 +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 net: sysfs: Fix weird usage of class's namespace relevant fields 2024-09-09 10:30:52 +01:00
net-sysfs.h
net-traces.c move asm/unaligned.h to linux/unaligned.h 2024-10-02 17:23:23 -04:00
netclassid_cgroup.c cgroup, netclassid: on modifying netclassid in cgroup, only consider the main process. 2023-10-16 16:36:53 -07:00
netdev_rx_queue.c memory-provider: dmabuf devmem memory provider 2024-09-11 20:44:31 -07:00
netdev-genl-gen.c netdev: avoid CFI problems with sock priv helpers 2025-01-23 17:22:52 +01:00
netdev-genl-gen.h netdev: support binding dma-buf to netdevice 2024-09-11 20:44:31 -07:00
netdev-genl.c net: export a helper for adding up queue stats 2025-05-18 08:24:50 +02:00
netevent.c
netmem_priv.h page_pool: Track DMA-mapped pages and unmap them when destroying the pool 2025-06-19 15:31:42 +02:00
netpoll.c netpoll: prevent hanging NAPI when netcons gets enabled 2025-08-15 12:14:04 +02:00
netprio_cgroup.c
of_net.c net: Explicitly include correct DT includes 2023-07-27 20:33:16 -07:00
page_pool_priv.h memory-provider: dmabuf devmem memory provider 2024-09-11 20:44:31 -07:00
page_pool_user.c net: page_pool: don't cast mp param to devmem 2025-04-20 10:15:17 +02:00
page_pool.c net: page_pool: Don't recycle into cache on PREEMPT_RT 2025-06-27 11:11:30 +01:00
pktgen.c net: pktgen: fix access outside of user given buffer in pktgen_thread_write() 2025-05-29 11:02:43 +02:00
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: Allocate vfinfo size for VF GUIDs when supported 2025-04-10 14:39:26 +02:00
scm.c tcp: devmem: don't write truncated dmabuf CMSGs to userspace 2025-03-07 18:25:32 +01:00
secure_seq.c
selftests.c net: selftests: fix TCP packet checksum 2025-07-06 11:01:41 +02:00
skbuff.c net: netmem: fix skb_ensure_writable with unreadable skbs 2025-06-27 11:11:43 +01:00
skmsg.c bpf, sockmap: Fix psock incorrectly pointing to sk 2025-08-15 12:13:39 +02:00
sock_destructor.h
sock_diag.c net: use unrcu_pointer() helper 2024-06-06 11:52:52 +02:00
sock_map.c bpf: Disable non stream socket for strparser 2025-02-27 04:30:19 -08:00
sock_reuseport.c net: core: annotate socks of struct sock_reuseport with __counted_by 2024-08-02 17:16:59 -07:00
sock.c net: better track kernel sockets lifetime 2025-08-20 18:30:56 +02:00
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 net: set the minimum for net_hotdata.netdev_budget_usecs 2025-03-07 18:25:29 +01:00
timestamping.c net: Change the API of PHY default timestamp to MAC 2024-07-15 08:02:26 -07:00
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 2025-06-27 11:11:40 +01:00
xdp.c page_pool: Move pp_magic check into helper functions 2025-06-19 15:31:42 +02:00