============================= WARNING: suspicious RCU usage 4.14.150 #0 Not tainted ----------------------------- ./include/net/sch_generic.h:303 suspicious rcu_dereference_check() usage! other info that might help us debug this: rcu_scheduler_active = 2, debug_locks = 1 5 locks held by syz-executor.3/12639: #0: (&pipe->mutex/1){+.+.}, at: [] pipe_lock_nested fs/pipe.c:67 [inline] #0: (&pipe->mutex/1){+.+.}, at: [] pipe_lock fs/pipe.c:75 [inline] #0: (&pipe->mutex/1){+.+.}, at: [] pipe_wait+0x181/0x1a0 fs/pipe.c:123 #1: (sk_lock-AF_INET){+.+.}, at: [] lock_sock include/net/sock.h:1462 [inline] #1: (sk_lock-AF_INET){+.+.}, at: [] raw_sendmsg+0xde0/0x2450 net/ipv4/raw.c:662 #2: (rcu_read_lock_bh){....}, at: [] lwtunnel_xmit_redirect include/net/lwtunnel.h:92 [inline] #2: (rcu_read_lock_bh){....}, at: [] ip_finish_output2+0x256/0x14a0 net/ipv4/ip_output.c:213 #3: (rcu_read_lock_bh){....}, at: [] __dev_queue_xmit+0x1e2/0x25e0 net/core/dev.c:3459 #4: (&qdisc_tx_lock){+.-.}, at: [] spin_lock include/linux/spinlock.h:317 [inline] #4: (&qdisc_tx_lock){+.-.}, at: [] __dev_xmit_skb net/core/dev.c:3204 [inline] #4: (&qdisc_tx_lock){+.-.}, at: [] __dev_queue_xmit+0x11c0/0x25e0 net/core/dev.c:3493 stack backtrace: CPU: 1 PID: 12639 Comm: syz-executor.3 Not tainted 4.14.150 #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+0x138/0x197 lib/dump_stack.c:53 lockdep_rcu_suspicious+0x153/0x15d kernel/locking/lockdep.c:4665 qdisc_root include/net/sch_generic.h:303 [inline] netem_enqueue+0x79c/0x2780 net/sched/sch_netem.c:472 __dev_xmit_skb net/core/dev.c:3229 [inline] __dev_queue_xmit+0x12da/0x25e0 net/core/dev.c:3493 dev_queue_xmit+0x18/0x20 net/core/dev.c:3558 neigh_hh_output include/net/neighbour.h:490 [inline] neigh_output include/net/neighbour.h:498 [inline] ip_finish_output2+0xddc/0x14a0 net/ipv4/ip_output.c:229 ip_do_fragment+0x1999/0x2170 net/ipv4/ip_output.c:678 ip_fragment.constprop.0+0x148/0x200 net/ipv4/ip_output.c:549 ip_finish_output+0x7bd/0xc60 net/ipv4/ip_output.c:315 NF_HOOK_COND include/linux/netfilter.h:239 [inline] ip_mc_output+0x24a/0xd40 net/ipv4/ip_output.c:390 dst_output include/net/dst.h:462 [inline] ip_local_out+0x97/0x170 net/ipv4/ip_output.c:124 ip_send_skb+0x3e/0xc0 net/ipv4/ip_output.c:1418 ip_push_pending_frames+0x64/0x80 net/ipv4/ip_output.c:1438 raw_sendmsg+0x1930/0x2450 net/ipv4/raw.c:669 inet_sendmsg+0x122/0x500 net/ipv4/af_inet.c:762 sock_sendmsg_nosec net/socket.c:646 [inline] sock_sendmsg+0xce/0x110 net/socket.c:656 kernel_sendmsg+0x44/0x50 net/socket.c:664 sock_no_sendpage+0x107/0x130 net/core/sock.c:2569 inet_sendpage+0x3b8/0x580 net/ipv4/af_inet.c:780 kernel_sendpage+0x92/0xf0 net/socket.c:3406 sock_sendpage+0x8b/0xc0 net/socket.c:871 pipe_to_sendpage+0x242/0x340 fs/splice.c:451 splice_from_pipe_feed fs/splice.c:502 [inline] __splice_from_pipe+0x348/0x780 fs/splice.c:626 splice_from_pipe+0xf0/0x150 fs/splice.c:661 generic_splice_sendpage+0x3c/0x50 fs/splice.c:832 do_splice_from fs/splice.c:851 [inline] do_splice fs/splice.c:1147 [inline] SYSC_splice fs/splice.c:1402 [inline] SyS_splice+0xd92/0x1430 fs/splice.c:1382 do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x459a59 RSP: 002b:00007f2077485c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000113 RAX: ffffffffffffffda RBX: 0000000000000006 RCX: 0000000000459a59 RDX: 0000000000000005 RSI: 0000000000000000 RDI: 0000000000000003 RBP: 000000000075bfc8 R08: 0000000004010005 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f20774866d4 R13: 00000000004c954e R14: 00000000004dffb0 R15: 00000000ffffffff audit: type=1400 audit(1571578675.846:162): avc: denied { block_suspend } for pid=12652 comm="syz-executor.4" capability=36 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=capability2 permissive=1 protocol 88fb is buggy, dev hsr_slave_0 protocol 88fb is buggy, dev hsr_slave_1 protocol 88fb is buggy, dev hsr_slave_0 protocol 88fb is buggy, dev hsr_slave_1 protocol 88fb is buggy, dev hsr_slave_0 protocol 88fb is buggy, dev hsr_slave_1 protocol 88fb is buggy, dev hsr_slave_0 protocol 88fb is buggy, dev hsr_slave_1 kvm [12737]: vcpu0, guest rIP: 0xfff0 disabled perfctr wrmsr: 0xc1 data 0x0 kvm [12737]: vcpu0, guest rIP: 0xfff0 disabled perfctr wrmsr: 0xc1 data 0x0 netlink: 44 bytes leftover after parsing attributes in process `syz-executor.2'. netlink: 44 bytes leftover after parsing attributes in process `syz-executor.2'. overlayfs: filesystem on './file0' not supported as upperdir net_ratelimit: 8 callbacks suppressed protocol 88fb is buggy, dev hsr_slave_0 protocol 88fb is buggy, dev hsr_slave_1 overlayfs: filesystem on './file0' not supported as upperdir protocol 88fb is buggy, dev hsr_slave_0 protocol 88fb is buggy, dev hsr_slave_1 protocol 88fb is buggy, dev hsr_slave_0 protocol 88fb is buggy, dev hsr_slave_1 protocol 88fb is buggy, dev hsr_slave_0 protocol 88fb is buggy, dev hsr_slave_1 device nr0 entered promiscuous mode ptrace attach of "/root/syz-executor.2"[12836] was attempted by "/root/syz-executor.2"[12837] protocol 88fb is buggy, dev hsr_slave_0 protocol 88fb is buggy, dev hsr_slave_1 atomic_op ffff8880a0b94f40 conn xmit_atomic (null) FAT-fs (loop1): error, fat_get_cluster: invalid cluster chain (i_pos 17) FAT-fs (loop1): Filesystem has been set read-only FAT-fs (loop1): error, fat_free: invalid cluster chain (i_pos 17) IPVS: set_ctl: invalid protocol: 46 172.20.20.170:20004 IPVS: set_ctl: invalid protocol: 46 172.20.20.170:20004 overlayfs: unrecognized mount option "upÑerdir=./" or missing value overlayfs: unrecognized mount option "upÑerdir=./" or missing value atomic_op ffff88809c734ac0 conn xmit_atomic (null) F2FS-fs (loop4): Magic Mismatch, valid(0xf2f52010) - read(0x0) F2FS-fs (loop4): Can't find valid F2FS filesystem in 1th superblock attempt to access beyond end of device loop4: rw=12288, want=8200, limit=20 F2FS-fs (loop4): invalid crc value attempt to access beyond end of device loop4: rw=12288, want=12296, limit=20 F2FS-fs (loop4): invalid crc value F2FS-fs (loop4): Failed to get valid F2FS checkpoint F2FS-fs (loop4): Magic Mismatch, valid(0xf2f52010) - read(0x0) F2FS-fs (loop4): Can't find valid F2FS filesystem in 1th superblock EXT4-fs (loop1): inodes count not valid: 4142989440 vs 128 attempt to access beyond end of device netlink: 12 bytes leftover after parsing attributes in process `syz-executor.0'. loop4: rw=12288, want=8200, limit=20 F2FS-fs (loop4): invalid crc value net_ratelimit: 12 callbacks suppressed protocol 88fb is buggy, dev hsr_slave_0