WARNING: suspicious RCU usage 4.14.0+ #194 Not tainted ----------------------------- sctp: [Deprecated]: syz-executor0 (pid 16929) Use of int in maxseg socket option. Use struct sctp_assoc_value instead ./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 syz-executor1/16905: #0: (sk_lock-AF_ALG){+.+.}, at: [] lock_sock include/net/sock.h:1465 [inline] #0: (sk_lock-AF_ALG){+.+.}, at: [] af_alg_wait_for_data+0x2f2/0x650 crypto/af_alg.c:768 stack backtrace: CPU: 1 PID: 16905 Comm: syz-executor1 Not tainted 4.14.0+ #194 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_encrypt_blkcipher+0x213/0x310 crypto/skcipher.c:628 crypto_skcipher_encrypt include/crypto/skcipher.h:445 [inline] _skcipher_recvmsg crypto/algif_skcipher.c:133 [inline] skcipher_recvmsg+0xa44/0xf30 crypto/algif_skcipher.c:164 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 RIP: 0033:0x452879 RSP: 002b:00007f4a50e56be8 EFLAGS: 00000212 ORIG_RAX: 000000000000002f RAX: ffffffffffffffda RBX: 00000000007580d8 RCX: 0000000000452879 RDX: 0000000000000000 RSI: 0000000020b2f000 RDI: 0000000000000014 RBP: 0000000000000086 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000212 R12: 00000000006f3718 R13: 00000000ffffffff R14: 00007f4a50e576d4 R15: 0000000000000008 page:ffffea000710edc0 count:0 mapcount:0 mapping: (null) index:0x0 flags: 0x2fffc0000000000() raw: 02fffc0000000000 0000000000000000 0000000000000000 00000000ffffffff raw: 0000000000000000 0000000100000001 0000000000000000 0000000000000000 page dumped because: VM_BUG_ON_PAGE(page_ref_count(page) == 0) ------------[ cut here ]------------ kernel BUG at ./include/linux/mm.h:482! invalid opcode: 0000 [#1] SMP KASAN Dumping ftrace buffer: (ftrace buffer empty) Modules linked in: CPU: 1 PID: 16905 Comm: syz-executor1 Not tainted 4.14.0+ #194 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff8801c690c080 task.stack: ffff8801c43b0000 RIP: 0010:put_page_testzero include/linux/mm.h:482 [inline] RIP: 0010:__free_pages+0x118/0x150 mm/page_alloc.c:4288 RSP: 0018:ffff8801c43b7700 EFLAGS: 00010203 RAX: 0000000000000000 RBX: ffffea000710edc0 RCX: 0000000000000000 RDX: 00000000001f0100 RSI: 1ffff10038d21925 RDI: ffffed0038876ed0 RBP: ffff8801c43b7790 R08: 1ffff10038876e04 R09: 0000000000000000 R10: dffffc0000000000 R11: 0000000000000000 R12: 1ffff10038876ee1 R13: 1ffff10038876ee5 R14: 0000000000000000 R15: ffff8801c43b7768 FS: 00007f4a50e57700(0000) GS:ffff8801db500000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f237e174300 CR3: 00000001d1905000 CR4: 00000000001426e0 Call Trace: free_pages+0x51/0x90 mm/page_alloc.c:4302 blkcipher_walk_done+0x767/0xde0 crypto/blkcipher.c:141 encrypt+0x20e/0x540 arch/x86/crypto/salsa20_glue.c:79 skcipher_crypt_blkcipher crypto/skcipher.c:619 [inline] skcipher_encrypt_blkcipher+0x213/0x310 crypto/skcipher.c:628 crypto_skcipher_encrypt include/crypto/skcipher.h:445 [inline] _skcipher_recvmsg crypto/algif_skcipher.c:133 [inline] skcipher_recvmsg+0xa44/0xf30 crypto/algif_skcipher.c:164 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 RIP: 0033:0x452879 RSP: 002b:00007f4a50e56be8 EFLAGS: 00000212 ORIG_RAX: 000000000000002f RAX: ffffffffffffffda RBX: 00000000007580d8 RCX: 0000000000452879 RDX: 0000000000000000 RSI: 0000000020b2f000 RDI: 0000000000000014 RBP: 0000000000000086 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000212 R12: 00000000006f3718 R13: 00000000ffffffff R14: 00007f4a50e576d4 R15: 0000000000000008 Code: 20 08 00 00 00 00 48 83 c4 68 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 29 f5 ff ff eb cf 48 c7 c6 80 2b 30 85 48 89 df e8 a8 60 0c 00 <0f> 0b 4c 89 ef 89 b5 74 ff ff ff e8 e8 f0 19 00 8b b5 74 ff ff RIP: put_page_testzero include/linux/mm.h:482 [inline] RSP: ffff8801c43b7700 RIP: __free_pages+0x118/0x150 mm/page_alloc.c:4288 RSP: ffff8801c43b7700 ---[ end trace 6946664590033f67 ]---