It looks like the -proposed kernel has picked up that missing patch:
~/c/linux ((Ubuntu-5.15.0-91.101))> git log --grep='virtio-net: set queues
after driver_ok'
commit c6c83b9055f44bcb2bc2fae32323c0a1510c7656
Author: Jason Wang <[email protected]>
Date: Wed Aug 9 23:12:56 2023 -0400
virtio-net: set queues after driver_ok
BugLink: https://bugs.launchpad.net/bugs/2038486
commit 51b813176f098ff61bd2833f627f5319ead098a5 upstream.
Commit 25266128fe16 ("virtio-net: fix race between set queues and
probe") tries to fix the race between set queues and probe by calling
_virtnet_set_queues() before DRIVER_OK is set. This violates virtio
spec. Fixing this by setting queues after virtio_device_ready().
Note that rtnl needs to be held for userspace requests to change the
number of queues. So we are serialized in this way.
Fixes: 25266128fe16 ("virtio-net: fix race between set queues and probe")
Reported-by: Dragos Tatulea <[email protected]>
Acked-by: Michael S. Tsirkin <[email protected]>
Signed-off-by: Jason Wang <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
Signed-off-by: Kamal Mostafa <[email protected]>
Signed-off-by: Stefan Bader <[email protected]>
--
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/2045443
Title:
Ubuntu-5.15.0-89.99 breaks virtio-net spec and doesn't boot
Status in linux package in Ubuntu:
New
Bug description:
I use a non-qemu VMM, cloud-hypervisor. It looks like a patch was
applied, that introduced a bug, a week later another patch got written
to fix that bug, and that second patch was not applied in Ubuntu's
release, but is seen in Greg KH's 5.15 branch.
The result of the bug is the kernel will not boot.
Cumulative diff:
```
> git diff Ubuntu-5.15.0-86.96 Ubuntu-5.15.0-89.99 drivers/net/virtio_net.c
diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
index 0351f86494f1..af335f8266c2 100644
--- a/drivers/net/virtio_net.c
+++ b/drivers/net/virtio_net.c
@@ -3319,6 +3319,8 @@ static int virtnet_probe(struct virtio_device *vdev)
}
}
+ _virtnet_set_queues(vi, vi->curr_queue_pairs);
+
/* serialize netdev register + virtio_device_ready() with ndo_open()
*/
rtnl_lock();
@@ -3339,8 +3341,6 @@ static int virtnet_probe(struct virtio_device *vdev)
goto free_unregister_netdev;
}
- virtnet_set_queues(vi, vi->curr_queue_pairs);
-
/* Assume link up if device can't report link status,
otherwise get link status from config. */
netif_carrier_off(dev);
```
Blamed Commit:
```
commit 5e0545ef5682562ffef072138d9340ea36a2ebc9
Author: Jason Wang <[email protected]>
Date: Tue Jul 25 03:20:49 2023 -0400
virtio-net: fix race between set queues and probe
BugLink: https://bugs.launchpad.net/bugs/2035400
commit 25266128fe16d5632d43ada34c847d7b8daba539 upstream.
A race were found where set_channels could be called after registering
but before virtnet_set_queues() in virtnet_probe(). Fixing this by
moving the virtnet_set_queues() before netdevice registering. While at
it, use _virtnet_set_queues() to avoid holding rtnl as the device is
not even registered at that time.
Cc: [email protected]
Fixes: a220871be66f ("virtio-net: correctly enable multiqueue")
Signed-off-by: Jason Wang <[email protected]>
Acked-by: Michael S. Tsirkin <[email protected]>
Reviewed-by: Xuan Zhuo <[email protected]>
Link:
https://lore.kernel.org/r/[email protected]
Signed-off-by: Jakub Kicinski <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
Signed-off-by: Kamal Mostafa <[email protected]>
Signed-off-by: Stefan Bader <[email protected]>
```
Investigation into Greg KH's 5.15 branch shows the (unapplied?)
followup as:
```
commit 431db3f48c286462ad7453ccdf284f590aafa949
Author: Jason Wang <[email protected]>
Date: Wed Aug 9 23:12:56 2023 -0400
virtio-net: set queues after driver_ok
commit 51b813176f098ff61bd2833f627f5319ead098a5 upstream.
Commit 25266128fe16 ("virtio-net: fix race between set queues and
probe") tries to fix the race between set queues and probe by calling
_virtnet_set_queues() before DRIVER_OK is set. This violates virtio
spec. Fixing this by setting queues after virtio_device_ready().
Note that rtnl needs to be held for userspace requests to change the
number of queues. So we are serialized in this way.
Fixes: 25266128fe16 ("virtio-net: fix race between set queues and probe")
Reported-by: Dragos Tatulea <[email protected]>
Acked-by: Michael S. Tsirkin <[email protected]>
Signed-off-by: Jason Wang <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
```
Boot stack trace:
```
[ 28.129660] watchdog: BUG: soft lockup - CPU#1 stuck for 26s!
[systemd-udevd:165]
[ 28.130265] Modules linked in: crct10dif_pclmul crc32_pclmul
ghash_clmulni_intel aesni_intel crypto_simd cryptd virtio_net(+)
net_failover virtio_rng failover virtio_blk
[ 28.131396] CPU: 1 PID: 165 Comm: systemd-udevd Not tainted
5.15.0-89-generic https://github.com/ubicloud/ubicloud/pull/99-Ubuntu
[ 28.131997] Hardware name: Cloud Hypervisor cloud-hypervisor, BIOS 0
[ 28.132479] RIP: 0010:virtnet_send_command+0x10b/0x170 [virtio_net]
[ 28.132951] Code: 0b 83 c1 d8 85 c0 0f 88 d2 6e 00 00 48 8b 7b 08 e8
6a 72 c1 d8 84 c0 75 11 eb 56 48 8b 7b 08 e8 6b 5e c1 d8 84 c0 75 17 f3
90 <48> 8b 7b 08 48 8d b5 6c ff ff ff e8 f5 71 c1 d8 48 85 c0 74 dc 48
[ 28.134326] RSP: 0018:ffff9b0c4064f9b8 EFLAGS: 00000246
[ 28.134720] RAX: 0000000000000000 RBX: ffff89dfc0d13980 RCX:
0000000000000a20
[ 28.135252] RDX: 0000000000000000 RSI: ffff9b0c4064f9bc RDI:
ffff89dfc7cc00c0
[ 28.135787] RBP: ffff9b0c4064fa50 R08: 0000000000000001 R09:
0000000000000003
[ 28.136316] R10: 0000000000000003 R11: 0000000000000002 R12:
ffff9b0c4064f9e0
[ 28.136851] R13: 0000000000000002 R14: 0000000000000004 R15:
ffff89dfc0c49400
[ 28.137381] FS: 00007feeba10e8c0(0000) GS:ffff89e0f7d00000(0000)
knlGS:0000000000000000
[ 28.137981] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 28.138408] CR2: 00007feeba90a0f8 CR3: 0000000100258000 CR4:
0000000000350ee0
[ 28.138940] Call Trace:
[ 28.139129] <IRQ>
[ 28.139291] ? show_trace_log_lvl+0x1d6/0x2ea
[ 28.139627] ? show_trace_log_lvl+0x1d6/0x2ea
[ 28.139957] ? _virtnet_set_queues+0xbb/0x100 [virtio_net]
[ 28.140369] ? show_regs.part.0+0x23/0x29
[ 28.140672] ? show_regs.cold+0x8/0xd
[ 28.140950] ? watchdog_timer_fn+0x1be/0x220
[ 28.141273] ? lockup_detector_update_enable+0x60/0x60
[ 28.141657] ? __hrtimer_run_queues+0x107/0x230
[ 28.142011] ? clockevents_program_event+0xad/0x130
[ 28.142377] ? hrtimer_interrupt+0x101/0x220
[ 28.142698] ? __sysvec_apic_timer_interrupt+0x61/0xe0
[ 28.143084] ? sysvec_apic_timer_interrupt+0x7b/0x90
[ 28.143460] </IRQ>
```
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2045443/+subscriptions
--
Mailing list: https://launchpad.net/~kernel-packages
Post to : [email protected]
Unsubscribe : https://launchpad.net/~kernel-packages
More help : https://help.launchpad.net/ListHelp
