Jakub Kicinski 52f671db18 net/sched: act_mirred: use the backlog for mirred ingress ... The test Davide added in commit ca22da2fbd ("act_mirred: use the backlog for nested calls to mirred ingress") hangs our testing VMs every 10 or so runs, with the familiar tcp_v4_rcv -> tcp_v4_rcv deadlock reported by lockdep. The problem as previously described by Davide (see Link) is that if we reverse flow of traffic with the redirect (egress -> ingress) we may reach the same socket which generated the packet. And we may still be holding its socket lock. The common solution to such deadlocks is to put the packet in the Rx backlog, rather than run the Rx path inline. Do that for all egress -> ingress reversals, not just once we started to nest mirred calls. In the past there was a concern that the backlog indirection will lead to loss of error reporting / less accurate stats. But the current workaround does not seem to address the issue. Fixes: 53592b3640 ("net/sched: act_mirred: Implement ingress actions") Cc: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com> Suggested-by: Davide Caratti <dcaratti@redhat.com> Link: https://lore.kernel.org/netdev/33dc43f587ec1388ba456b4915c75f02a8aae226.1663945716.git.dcaratti@redhat.com/ Signed-off-by: Jakub Kicinski <kuba@kernel.org> Acked-by: Jamal Hadi Salim <jhs@mojatatu.com> Signed-off-by: David S. Miller <davem@davemloft.net>		2024-02-16 10:13:31 +00:00
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accounting
arch	work around gcc bugs with 'asm goto' with outputs	2024-02-09 15:57:48 -08:00
bootconfig
bpf	bpfilter: remove bpfilter	2024-01-04 10:23:10 -08:00
build	perf cs-etm: Bump minimum OpenCSD version to ensure a bugfix is present	2023-11-27 10:21:27 -03:00
certs
cgroup	samples: introduce new samples subdir for cgroup	2023-12-10 16:51:54 -08:00
counter	tools/counter: Remove unneeded semicolon	2023-12-20 11:43:31 -05:00
crypto	crypto: tcrypt - add script tcrypt_speed_compare.py	2023-12-29 11:25:55 +08:00
debugging
edid
firewire
firmware
gpio
hv
iio	iio: add modifiers for A and B ultraviolet light	2023-12-04 13:57:24 +00:00
include	work around gcc bugs with 'asm goto' with outputs	2024-02-09 15:57:48 -08:00
kvm/kvm_stat
laptop
leds
lib	perf tools improvements and fixes for v6.8:	2024-01-19 14:25:23 -08:00
memory-model
mm
net/ynl	tools/net/ynl-gen-rst: Remove extra indentation from generated docs	2023-12-18 14:39:44 -08:00
objtool	Address a GCC-14 warning: there's no real bug, but indeed the calloc order doesn't match	2024-01-08 18:31:27 -08:00
pci
pcmcia
perf	perf evlist: Fix evlist__new_default() for > 1 core PMU	2024-01-30 11:40:28 -03:00
power	tools cpupower bench: Override CFLAGS assignments	2024-01-21 16:57:51 -07:00
rcu
scripts
spi
testing	net/sched: act_mirred: use the backlog for mirred ingress	2024-02-16 10:13:31 +00:00
thermal	tools/thermal/tmon: Fix compilation warning for wrong format	2024-01-02 09:33:19 +01:00
time
tracing	tools/rtla: Exit with EXIT_SUCCESS when help is invoked	2024-02-12 10:59:09 +01:00
usb
verification	tools/rv: Fix curr_reactor uninitialized variable	2024-02-12 09:58:36 +01:00
virtio
wmi
workqueue
Makefile