On Mon, Nov 27, 2017 at 10:56:46AM -0800, syzbot wrote: > Hello, > > syzkaller hit the following crash on > 1ea8d039f9edcfefb20d8ddfe136930f6e551529 > git://git.cmpxchg.org/linux-mmots.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 > > > kasan: CONFIG_KASAN_INLINE enabled > kasan: GPF could be caused by NULL-ptr deref or user memory access > general protection fault: 0000 [#1] SMP KASAN > Dumping ftrace buffer: > (ftrace buffer empty) > Modules linked in: > CPU: 0 PID: 25985 Comm: cryptomgr_test Not tainted 4.14.0-mm1+ #25 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS > Google 01/01/2011 > task: ffff8801c4562180 task.stack: ffff8801d5b70000 > RIP: 0010:crypto_remove_spawns+0x58c/0x1260 crypto/algapi.c:159 > RSP: 0018:ffff8801d5b779e8 EFLAGS: 00010206 > RAX: 0000000000000003 RBX: dffffc0000000000 RCX: ffffffff82258aab > RDX: 0000000000000000 RSI: 1ffff1003ab6efa6 RDI: 0000000000000018 > RBP: ffff8801d5b77dd8 R08: ffff8801d5b77d70 R09: 0000000000000004 > R10: 0000000000000000 R11: ffffffff8747dda0 R12: 0000000000000000 > R13: ffff8801c505bb60 R14: ffffed003ab6ef4e R15: ffff8801d5b77db0 > FS: 0000000000000000(0000) GS:ffff8801db400000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 00007fff1d3ffcac CR3: 00000001cf825000 CR4: 00000000001406f0 > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > Call Trace: > crypto_alg_tested+0x514/0x6f0 crypto/algapi.c:311 > cryptomgr_test+0x17/0x30 crypto/algboss.c:226 > kthread+0x37a/0x440 kernel/kthread.c:238 > ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:437 > Code: 84 e3 01 00 00 e8 35 94 4a ff 4c 89 e8 48 c1 e8 03 80 3c 18 00 0f 85 > d8 09 00 00 4d 8b 65 00 49 8d 7c 24 18 48 89 f8 48 c1 e8 03 <80> 3c 18 00 0f > 85 b4 09 00 00 4d 8b 6c 24 18 4c 3b ad 50 fc ff > RIP: crypto_remove_spawns+0x58c/0x1260 crypto/algapi.c:159 RSP: > ffff8801d5b779e8 > ---[ end trace 14ce8f86fe2873b1 ]--- > Kernel panic - not syncing: Fatal exception > Dumping ftrace buffer: > (ftrace buffer empty) > Kernel Offset: disabled > Rebooting in 86400 seconds.. Fix for the actual crash now is in Linus' tree: #syz fix: crypto: algapi - fix NULL dereference in crypto_remove_spawns()
