On Tue, Nov 28, 2017 at 07:23:01AM -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. > > Unfortunately, I don't have any reproducer for this bug yet. > > > WARNING: suspicious RCU usage > 4.14.0+ #130 Not tainted > page:ffffea000765abc0 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: 10013 Comm: syz-executor2 Not tainted 4.14.0+ #130 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS > Google 01/01/2011 > task: ffff8801d807a300 task.stack: ffff8801d96a8000 > RIP: 0010:put_page_testzero include/linux/mm.h:482 [inline] > RIP: 0010:__free_pages+0x118/0x150 mm/page_alloc.c:4288 > RSP: 0018:ffff8801d96af860 EFLAGS: 00010206 > RAX: 0000000000000000 RBX: ffffea000765abc0 RCX: 0000000000000000 > RDX: 00000000001f0100 RSI: 1ffff1003b00f575 RDI: ffffed003b2d5f00 > RBP: ffff8801d96af8f0 R08: 1ffff1003b2d5e30 R09: 0000000000000000 > R10: dffffc0000000000 R11: 0000000000000000 R12: 1ffff1003b2d5f0d > R13: 1ffff1003b2d5f11 R14: 0000000000000000 R15: ffff8801d96af8c8 > FS: 00007f5ca866d700(0000) GS:ffff8801db500000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 0000000020f73000 CR3: 00000001d7cf7000 CR4: 00000000001406e0 > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > Call Trace: > free_pages+0x51/0x90 mm/page_alloc.c:4302 > blkcipher_walk_done+0x767/0xde0 crypto/blkcipher.c:141 > 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 > SYSC_recvfrom+0x2dc/0x570 net/socket.c:1801 > SyS_recvfrom+0x40/0x50 net/socket.c:1773 > entry_SYSCALL_64_fastpath+0x1f/0x96 #syz dup: WARNING: suspicious RCU usage (3)
