bisecting fixing commit since e69ec487b2c7c82ef99b4b15122f58a2a99289a3
building syzkaller on 4de4e9f01d7139b72102ae0b8a1e810730467774
testing commit e69ec487b2c7c82ef99b4b15122f58a2a99289a3 with gcc (GCC) 8.1.0
kernel signature: 92869df1183c8ebf3029bcd1fcc3e8e9f63c72e04ff2e5c82107a8e7deaa3d58
all runs: crashed: WARNING in mark_lock
testing current HEAD ab51cac00ef2859f20a73d33a53f3a8987b65e11
testing commit ab51cac00ef2859f20a73d33a53f3a8987b65e11 with gcc (GCC) 8.1.0
kernel signature: 7fe4cb6cad9125b2d86ee347f2f6e8b1dbed4cfd6abdcb353d5649aabd381521
run #0: crashed: WARNING: locking bug in dev_mc_seq_show
run #1: crashed: WARNING: locking bug in dev_mc_seq_show
run #2: crashed: WARNING: locking bug in dev_mc_seq_show
run #3: crashed: WARNING: locking bug in dev_mc_seq_show
run #4: crashed: WARNING: locking bug in dev_mc_seq_show
run #5: crashed: WARNING: locking bug in dev_mc_seq_show
run #6: OK
run #7: crashed: BUG: MAX_LOCKDEP_ENTRIES too low!
run #8: crashed: BUG: MAX_LOCKDEP_ENTRIES too low!
run #9: boot failed: can't ssh into the instance
revisions tested: 2, total time: 29m6.363745767s (build: 11m52.628015986s, test: 16m21.2441181s)
the crash still happens on HEAD
commit msg: Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net
crash: BUG: MAX_LOCKDEP_ENTRIES too low!
device bridge_slave_0 left promiscuous mode
bridge0: port 1(bridge_slave_0) entered disabled state
device veth1_vlan left promiscuous mode
device veth0_vlan left promiscuous mode
BUG: MAX_LOCKDEP_ENTRIES too low!
turning off the locking correctness validator.
CPU: 0 PID: 304 Comm: kworker/u4:5 Not tainted 5.7.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: netns cleanup_net
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x12d/0x187 lib/dump_stack.c:118
 alloc_list_entry.cold.53+0x11/0x18 kernel/locking/lockdep.c:1329
 add_lock_to_list kernel/locking/lockdep.c:1350 [inline]
 check_prev_add kernel/locking/lockdep.c:2567 [inline]
 check_prevs_add kernel/locking/lockdep.c:2620 [inline]
 validate_chain kernel/locking/lockdep.c:3237 [inline]
 __lock_acquire+0x2886/0x3bf0 kernel/locking/lockdep.c:4355
 lock_acquire+0x209/0x9e0 kernel/locking/lockdep.c:4934
 __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
 _raw_spin_lock+0x2d/0x40 kernel/locking/spinlock.c:151
 spin_lock include/linux/spinlock.h:353 [inline]
 kfree_call_rcu+0x47f/0x7d0 kernel/rcu/tree.c:3043
 __hw_addr_del_entry+0x220/0x310 net/core/dev_addr_lists.c:107
 __hw_addr_del_ex+0xc4/0x100 net/core/dev_addr_lists.c:121
 __dev_mc_del+0x73/0xb0 net/core/dev_addr_lists.c:806
 dev_mc_del+0xb/0x10 net/core/dev_addr_lists.c:824
 igmp6_group_dropped+0x24b/0x820 net/ipv6/mcast.c:708
 ipv6_mc_down+0x57/0xf0 net/ipv6/mcast.c:2541
 ipv6_mc_destroy_dev+0x19/0x170 net/ipv6/mcast.c:2603
 addrconf_ifdown+0xa7a/0xf90 net/ipv6/addrconf.c:3852
 addrconf_notify+0x594/0x2000 net/ipv6/addrconf.c:3643
 notifier_call_chain+0x8a/0x160 kernel/notifier.c:83
 __raw_notifier_call_chain kernel/notifier.c:361 [inline]
 raw_notifier_call_chain+0x11/0x20 kernel/notifier.c:368
 call_netdevice_notifiers_info+0x87/0xd0 net/core/dev.c:1948
 call_netdevice_notifiers_extack net/core/dev.c:1960 [inline]
 call_netdevice_notifiers net/core/dev.c:1974 [inline]
 rollback_registered_many+0x6a5/0xdc0 net/core/dev.c:8828
 unregister_netdevice_many+0x3e/0x1f0 net/core/dev.c:9988
 default_device_exit_batch+0x2f3/0x3e0 net/core/dev.c:10471
 ops_exit_list.isra.6+0xdf/0x130 net/core/net_namespace.c:189
 cleanup_net+0x491/0x9e0 net/core/net_namespace.c:603
 process_one_work+0x893/0x1690 kernel/workqueue.c:2268
 worker_thread+0x85/0xb60 kernel/workqueue.c:2414
 kthread+0x354/0x420 kernel/kthread.c:268
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
device hsr_slave_0 left promiscuous mode
device hsr_slave_1 left promiscuous mode
team0 (unregistering): Port device team_slave_1 removed
team0 (unregistering): Port device team_slave_0 removed
bond0 (unregistering): (slave bond_slave_1): Releasing backup interface
bond0 (unregistering): (slave bond_slave_0): Releasing backup interface
bond0 (unregistering): Released all slaves