============================= WARNING: suspicious RCU usage 4.14.0-next-20171124+ #51 Not tainted ----------------------------- ./include/trace/events/kmem.h:142 suspicious rcu_dereference_check() usage! RDS: rds_bind could not find a transport for 172.20.1.187, load rds_tcp or rds_rdma? netlink: 1 bytes leftover after parsing attributes in process `syz-executor7'. other info that might help us debug this: netlink: 1 bytes leftover after parsing attributes in process `syz-executor7'. rcu_scheduler_active = 2, debug_locks = 1 1 lock held by syz-executor6/21325: #0: (sk_lock-AF_ALG){+.+.}, at: [] lock_sock include/net/sock.h:1467 [inline] #0: (sk_lock-AF_ALG){+.+.}, at: [] af_alg_wait_for_data+0x2f2/0x650 crypto/af_alg.c:768 stack backtrace: CPU: 1 PID: 21325 Comm: syz-executor6 Not tainted 4.14.0-next-20171124+ #51 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+0x194/0x257 lib/dump_stack.c:53 lockdep_rcu_suspicious+0x123/0x170 kernel/locking/lockdep.c:4675 trace_kfree include/trace/events/kmem.h:137 [inline] kfree+0x20a/0x250 mm/slab.c:3797 blkcipher_walk_done+0x72b/0xde0 crypto/blkcipher.c:139 encrypt+0x50a/0xaf0 crypto/salsa20_generic.c:208 skcipher_crypt_blkcipher crypto/skcipher.c:619 [inline] skcipher_decrypt_blkcipher+0x213/0x310 crypto/skcipher.c:637 crypto_skcipher_decrypt include/crypto/skcipher.h:463 [inline] _skcipher_recvmsg crypto/algif_skcipher.c:133 [inline] skcipher_recvmsg+0xb06/0xf30 crypto/algif_skcipher.c:164 sock_recvmsg_nosec net/socket.c:805 [inline] sock_recvmsg+0xc9/0x110 net/socket.c:812 sock_read_iter+0x361/0x560 net/socket.c:889 call_read_iter include/linux/fs.h:1766 [inline] new_sync_read fs/read_write.c:401 [inline] __vfs_read+0x6ad/0xa00 fs/read_write.c:413 vfs_read+0x124/0x360 fs/read_write.c:447 SYSC_read fs/read_write.c:573 [inline] SyS_read+0xef/0x220 fs/read_write.c:566 entry_SYSCALL_64_fastpath+0x1f/0x96 RIP: 0033:0x452879 RSP: 002b:00007fd5f885ebe8 EFLAGS: 00000212 ORIG_RAX: 0000000000000000 RAX: ffffffffffffffda RBX: 0000000000758020 RCX: 0000000000452879 RDX: 00000000000000fa RSI: 0000000020556f06 RDI: 0000000000000015 RBP: 0000000000000086 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000212 R12: 00000000006f2608 R13: 00000000ffffffff R14: 00007fd5f885f6d4 R15: 0000000000000000 BUG: unable to handle kernel NULL pointer dereference at 0000000000000074 IP: virt_to_cache mm/slab.c:400 [inline] IP: kfree+0xb2/0x250 mm/slab.c:3803 PGD 1cda78067 P4D 1cda78067 PUD 191ba9067 PMD 0 Oops: 0000 [#1] SMP KASAN Dumping ftrace buffer: (ftrace buffer empty) Modules linked in: CPU: 1 PID: 21325 Comm: syz-executor6 Not tainted 4.14.0-next-20171124+ #51 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff8801ca8c8500 task.stack: ffff8801d8cd0000 RIP: 0010:virt_to_cache mm/slab.c:400 [inline] RIP: 0010:kfree+0xb2/0x250 mm/slab.c:3803 RSP: 0018:ffff8801d8cd7820 EFLAGS: 00010046 RAX: 0000000000000000 RBX: ffff8801d8cd79e8 RCX: ffffffffffffffff RDX: ffffea00076335c0 RSI: 0000000000000000 RDI: ffff8801d8cd79e8 RBP: ffff8801d8cd7840 R08: 1ffff1003b19aeb6 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000286 R13: 0000000000000000 R14: ffff8801d8cd79e8 R15: ffff8801d8cd7950 FS: 00007fd5f885f700(0000) GS:ffff8801db500000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000074 CR3: 00000001cf3db000 CR4: 00000000001426e0 DR0: 0000000020000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: blkcipher_walk_done+0x72b/0xde0 crypto/blkcipher.c:139 encrypt+0x50a/0xaf0 crypto/salsa20_generic.c:208 skcipher_crypt_blkcipher crypto/skcipher.c:619 [inline] skcipher_decrypt_blkcipher+0x213/0x310 crypto/skcipher.c:637 crypto_skcipher_decrypt include/crypto/skcipher.h:463 [inline] _skcipher_recvmsg crypto/algif_skcipher.c:133 [inline] skcipher_recvmsg+0xb06/0xf30 crypto/algif_skcipher.c:164 sock_recvmsg_nosec net/socket.c:805 [inline] sock_recvmsg+0xc9/0x110 net/socket.c:812 sock_read_iter+0x361/0x560 net/socket.c:889 call_read_iter include/linux/fs.h:1766 [inline] new_sync_read fs/read_write.c:401 [inline] __vfs_read+0x6ad/0xa00 fs/read_write.c:413 vfs_read+0x124/0x360 fs/read_write.c:447 SYSC_read fs/read_write.c:573 [inline] SyS_read+0xef/0x220 fs/read_write.c:566 entry_SYSCALL_64_fastpath+0x1f/0x96 RIP: 0033:0x452879 RSP: 002b:00007fd5f885ebe8 EFLAGS: 00000212 ORIG_RAX: 0000000000000000 RAX: ffffffffffffffda RBX: 0000000000758020 RCX: 0000000000452879 RDX: 00000000000000fa RSI: 0000000020556f06 RDI: 0000000000000015 RBP: 0000000000000086 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000212 R12: 00000000006f2608 R13: 00000000ffffffff R14: 00007fd5f885f6d4 R15: 0000000000000000 Code: c2 48 b8 00 00 00 00 00 ea ff ff 48 89 df 48 c1 ea 0c 48 c1 e2 06 48 01 c2 48 8b 42 20 48 8d 48 ff a8 01 48 0f 45 d1 4c 8b 6a 30 <49> 63 75 74 e8 a5 59 af ff 48 89 de 4c 89 ef 4c 8b 75 08 e8 76 RIP: virt_to_cache mm/slab.c:400 [inline] RSP: ffff8801d8cd7820 RIP: kfree+0xb2/0x250 mm/slab.c:3803 RSP: ffff8801d8cd7820 CR2: 0000000000000074 ---[ end trace 422e11d39e116b79 ]---