On Tue, Nov 28, 2017 at 06:22:01AM -0800, syzbot wrote: > Hello, > > syzkaller hit the following crash on > 1d3b78bbc6e983fabb3fbf91b76339bf66e4a12c > git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next.git/master > compiler: gcc (GCC) 7.1.1 20170620 > .config is attached > Raw console output is attached. > C reproducer is attached > syzkaller reproducer is attached. See https://goo.gl/kgGztJ > for information about syzkaller reproducers > > > > ============================= > WARNING: suspicious RCU usage > 4.14.0+ #192 Not tainted > ----------------------------- > ./include/trace/events/kmem.h:142 suspicious rcu_dereference_check() usage! > > other info that might help us debug this: > > > rcu_scheduler_active = 2, debug_locks = 1 > 1 lock held by syzkaller215525/3051: > #0: (sk_lock-AF_ALG){+.+.}, at: [<ffffffff8239ac22>] lock_sock > include/net/sock.h:1465 [inline] > #0: (sk_lock-AF_ALG){+.+.}, at: [<ffffffff8239ac22>] > af_alg_wait_for_data+0x2f2/0x650 crypto/af_alg.c:768 > > stack backtrace: > CPU: 0 PID: 3051 Comm: syzkaller215525 Not tainted 4.14.0+ #192 > 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:3796 > blkcipher_walk_done+0x72b/0xde0 crypto/blkcipher.c:139 > encrypt+0x20e/0x540 arch/x86/crypto/salsa20_glue.c:79 > 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 > skcipher_recvmsg_nokey+0x60/0x80 crypto/algif_skcipher.c:283 > sock_recvmsg_nosec net/socket.c:805 [inline] > sock_recvmsg+0xc9/0x110 net/socket.c:812 > ___sys_recvmsg+0x29b/0x630 net/socket.c:2207 > __sys_recvmsg+0xe2/0x210 net/socket.c:2252 > SYSC_recvmsg net/socket.c:2264 [inline] > SyS_recvmsg+0x2d/0x50 net/socket.c:2259 > entry_SYSCALL_64_fastpath+0x1f/0x96 #syz dup: WARNING: suspicious RCU usage (3)
