============================= WARNING: suspicious RCU usage 4.14.279-syzkaller #0 Not tainted ----------------------------- net/netfilter/nf_queue.c:244 suspicious rcu_dereference_check() usage! other info that might help us debug this: rcu_scheduler_active = 2, debug_locks = 1 2 locks held by ksoftirqd/0/7: #0: (rcu_callback){....}, at: [] __rcu_reclaim kernel/rcu/rcu.h:185 [inline] #0: (rcu_callback){....}, at: [] rcu_do_batch kernel/rcu/tree.c:2699 [inline] #0: (rcu_callback){....}, at: [] invoke_rcu_callbacks kernel/rcu/tree.c:2962 [inline] #0: (rcu_callback){....}, at: [] __rcu_process_callbacks kernel/rcu/tree.c:2929 [inline] #0: (rcu_callback){....}, at: [] rcu_process_callbacks+0x84e/0x1180 kernel/rcu/tree.c:2946 #1: (&(&inst->lock)->rlock){+.-.}, at: [] spin_lock_bh include/linux/spinlock.h:322 [inline] #1: (&(&inst->lock)->rlock){+.-.}, at: [] nfqnl_flush+0x2f/0x2a0 net/netfilter/nfnetlink_queue.c:232 stack backtrace: CPU: 0 PID: 7 Comm: ksoftirqd/0 Not tainted 4.14.279-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x1b2/0x281 lib/dump_stack.c:58 nf_reinject+0x56e/0x700 net/netfilter/nf_queue.c:244 nfqnl_flush+0x1ab/0x2a0 net/netfilter/nfnetlink_queue.c:237 instance_destroy_rcu+0x19/0x30 net/netfilter/nfnetlink_queue.c:171 __rcu_reclaim kernel/rcu/rcu.h:195 [inline] rcu_do_batch kernel/rcu/tree.c:2699 [inline] invoke_rcu_callbacks kernel/rcu/tree.c:2962 [inline] __rcu_process_callbacks kernel/rcu/tree.c:2929 [inline] rcu_process_callbacks+0x780/0x1180 kernel/rcu/tree.c:2946 __do_softirq+0x24d/0x9ff kernel/softirq.c:288 run_ksoftirqd+0x50/0x1a0 kernel/softirq.c:670 smpboot_thread_fn+0x5c1/0x920 kernel/smpboot.c:164 kthread+0x30d/0x420 kernel/kthread.c:232 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404 9pnet: Insufficient options for proto=fd audit: type=1800 audit(1652644906.695:8): pid=9536 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="syz-executor.1" name="file0" dev="sda1" ino=13920 res=0 audit: type=1804 audit(1652644906.815:9): pid=9536 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.1" name="/root/syzkaller-testdir3129328558/syzkaller.oOFNXD/2/file0" dev="sda1" ino=13920 res=1 audit: type=1800 audit(1652644906.955:10): pid=9537 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="syz-executor.3" name="file0" dev="sda1" ino=13921 res=0 audit: type=1804 audit(1652644907.055:11): pid=9537 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.3" name="/root/syzkaller-testdir31503229/syzkaller.he7MDJ/4/file0" dev="sda1" ino=13921 res=1 ip_tables: iptables: counters copy to user failed while replacing table kauditd_printk_skb: 2 callbacks suppressed audit: type=1800 audit(1652644908.485:14): pid=9556 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="syz-executor.3" name="file0" dev="sda1" ino=13910 res=0 audit: type=1800 audit(1652644908.625:15): pid=9557 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="syz-executor.1" name="file0" dev="sda1" ino=13911 res=0 audit: type=1800 audit(1652644908.685:16): pid=9558 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="syz-executor.0" name="file0" dev="sda1" ino=13912 res=0 audit: type=1804 audit(1652644908.685:17): pid=9556 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.3" name="/root/syzkaller-testdir31503229/syzkaller.he7MDJ/5/file0" dev="sda1" ino=13910 res=1 audit: type=1804 audit(1652644908.845:18): pid=9557 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.1" name="/root/syzkaller-testdir3129328558/syzkaller.oOFNXD/3/file0" dev="sda1" ino=13911 res=1 audit: type=1804 audit(1652644908.885:19): pid=9558 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.0" name="/root/syzkaller-testdir558457275/syzkaller.w8vXLm/4/file0" dev="sda1" ino=13912 res=1 audit: type=1804 audit(1652644909.665:20): pid=9553 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="ToMToU" comm="syz-executor.3" name="/root/syzkaller-testdir31503229/syzkaller.he7MDJ/5/file0" dev="sda1" ino=13910 res=1 audit: type=1804 audit(1652644909.665:21): pid=9555 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="ToMToU" comm="syz-executor.0" name="/root/syzkaller-testdir558457275/syzkaller.w8vXLm/4/file0" dev="sda1" ino=13912 res=1 audit: type=1804 audit(1652644909.765:22): pid=9557 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="ToMToU" comm="syz-executor.1" name="/root/syzkaller-testdir3129328558/syzkaller.oOFNXD/3/file0" dev="sda1" ino=13911 res=1 netlink: 12 bytes leftover after parsing attributes in process `syz-executor.2'. ip_tables: iptables: counters copy to user failed while replacing table audit: type=1800 audit(1652644910.555:23): pid=9573 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="syz-executor.4" name="file0" dev="sda1" ino=13928 res=0 ip_tables: iptables: counters copy to user failed while replacing table netlink: 12 bytes leftover after parsing attributes in process `syz-executor.2'. ip_tables: iptables: counters copy to user failed while replacing table 9pnet: Insufficient options for proto=fd kauditd_printk_skb: 14 callbacks suppressed audit: type=1800 audit(1652644914.705:38): pid=9602 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="syz-executor.4" name="file0" dev="sda1" ino=13942 res=0 audit: type=1804 audit(1652644914.805:39): pid=9602 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.4" name="/root/syzkaller-testdir2228474584/syzkaller.W8LxYR/8/file0" dev="sda1" ino=13942 res=1 audit: type=1804 audit(1652644914.985:40): pid=9602 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="ToMToU" comm="syz-executor.4" name="/root/syzkaller-testdir2228474584/syzkaller.W8LxYR/8/file0" dev="sda1" ino=13942 res=1 9pnet: Insufficient options for proto=fd 9pnet: Insufficient options for proto=fd netlink: 4 bytes leftover after parsing attributes in process `syz-executor.4'. 9pnet: Insufficient options for proto=fd 9pnet: Insufficient options for proto=fd netlink: 12 bytes leftover after parsing attributes in process `syz-executor.4'. netlink: 4 bytes leftover after parsing attributes in process `syz-executor.4'. netlink: 12 bytes leftover after parsing attributes in process `syz-executor.4'. netlink: 4 bytes leftover after parsing attributes in process `syz-executor.4'. netlink: 12 bytes leftover after parsing attributes in process `syz-executor.4'. 9pnet: Insufficient options for proto=fd netlink: 4 bytes leftover after parsing attributes in process `syz-executor.4'. netlink: 12 bytes leftover after parsing attributes in process `syz-executor.4'.