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...at linux-foundation.org> > Signed-off-by: Raghavendra K T <raghavendra.kt at linux.vnet.ibm.com> With this patch, my VMs lock up quickly after boot with: [ 161.613469] BUG: spinlock lockup suspected on CPU#31, kworker/31:1/5213 [ 161.613469] lock: purge_lock.28981+0x0/0x40, .magic: dead4ead, .owner: kworker/7:1/6400, .owner_cpu: 7 [ 161.613469] CPU: 31 PID: 5213 Comm: kworker/31:1 Not tainted 3.19.0-rc7-next-20150204-sasha-00048-gee3a350 #1869 [ 161.613469] Workqueue: events bpf_prog_free_deferred [ 161.613469] 0000000000000000 00000000f03dd27f ffff88056b227a88 ffffffffa1702276 [...

...at linux-foundation.org> > Signed-off-by: Raghavendra K T <raghavendra.kt at linux.vnet.ibm.com> With this patch, my VMs lock up quickly after boot with: [ 161.613469] BUG: spinlock lockup suspected on CPU#31, kworker/31:1/5213 [ 161.613469] lock: purge_lock.28981+0x0/0x40, .magic: dead4ead, .owner: kworker/7:1/6400, .owner_cpu: 7 [ 161.613469] CPU: 31 PID: 5213 Comm: kworker/31:1 Not tainted 3.19.0-rc7-next-20150204-sasha-00048-gee3a350 #1869 [ 161.613469] Workqueue: events bpf_prog_free_deferred [ 161.613469] 0000000000000000 00000000f03dd27f ffff88056b227a88 ffffffffa1702276 [...

Paravirt spinlock clears slowpath flag after doing unlock. As explained by Linus currently it does: prev = *lock; add_smp(&lock->tickets.head, TICKET_LOCK_INC); /* add_smp() is a full mb() */ if (unlikely(lock->tickets.tail & TICKET_SLOWPATH_FLAG)) __ticket_unlock_slowpath(lock, prev); which

Paravirt spinlock clears slowpath flag after doing unlock. As explained by Linus currently it does: prev = *lock; add_smp(&lock->tickets.head, TICKET_LOCK_INC); /* add_smp() is a full mb() */ if (unlikely(lock->tickets.tail & TICKET_SLOWPATH_FLAG)) __ticket_unlock_slowpath(lock, prev); which