Eric Dumazet 97e719a82b net: fix possible race in skb_attempt_defer_free() ... A cpu can observe sd->defer_count reaching 128, and call smp_call_function_single_async() Problem is that the remote CPU can clear sd->defer_count before the IPI is run/acknowledged. Other cpus can queue more packets and also decide to call smp_call_function_single_async() while the pending IPI was not yet delivered. This is a common issue with smp_call_function_single_async(). Callers must ensure correct synchronization and serialization. I triggered this issue while experimenting smaller threshold. Performing the call to smp_call_function_single_async() under sd->defer_lock protection did not solve the problem. Commit 5a18ceca63 ("smp: Allow smp_call_function_single_async() to insert locked csd") replaced an informative WARN_ON_ONCE() with a return of -EBUSY, which is often ignored. Test of CSD_FLAG_LOCK presence is racy anyway. Fixes: 68822bdf76 ("net: generalize skb freeing deferral to per-cpu lists") Signed-off-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>		2022-05-16 11:33:59 +01:00
..
acpi	ACPI: bus: Eliminate acpi_bus_get_device()	2022-04-05 19:49:26 +02:00
asm-generic	bug: Have __warn() prototype defined unconditionally	2022-04-26 10:59:57 +02:00
clocksource
crypto	Merge branch 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6	2022-03-21 16:02:36 -07:00
drm
dt-bindings	dt-bindings: clk: mpfs: add defines for two new clocks	2022-04-22 18:40:15 -07:00
keys
kunit
kvm
linux	net: fix possible race in skb_attempt_defer_free()	2022-05-16 11:33:59 +01:00
math-emu
media
memory	memory: renesas-rpc-if: Fix HF/OSPI data transfer in Manual Mode	2022-04-21 17:00:24 +02:00
misc
net	inet: rename INET_MATCH()	2022-05-16 10:31:06 +01:00
pcmcia
ras	mm/memory-failure.c: fix race with changing page compound again	2022-03-22 15:57:07 -07:00
rdma	RDMA/core: Delete IPsec flow action logic from the core	2022-04-09 08:25:06 +03:00
scsi	scsi: iscsi: Fix NOP handling during conn recovery	2022-04-11 22:09:35 -04:00
soc	net: mscc: ocelot: move ocelot_port_private :: chip_port to ocelot_port :: index	2022-05-12 16:39:18 -07:00
sound	ASoC: Fixes for v5.18	2022-04-19 17:26:01 +02:00
target
trace	mptcp: dump infinite_map field in mptcp_dump_mpext	2022-04-23 11:51:05 +01:00
uapi	net: add IFLA_TSO_{MAX_SIZE|SEGS} attributes	2022-05-16 10:18:55 +01:00
vdso
video
xen