bisecting fixing commit since b98aebd298246df37b472c52a2ee1023256d02e3
building syzkaller on b602d64b5991c147af88f1e0f8d961c8b4b4a748
testing commit b98aebd298246df37b472c52a2ee1023256d02e3 with gcc (GCC) 8.1.0
kernel signature: 7a632d5ec8707a530215064497afef974e8fa94382c63451f67237897e202ecd
all runs: crashed: general protection fault in rdma_resolve_route
testing current HEAD 2b79150141611d3c6e1b55d4e70f49602482f0b8
testing commit 2b79150141611d3c6e1b55d4e70f49602482f0b8 with gcc (GCC) 8.1.0
kernel signature: 445341fc25f60da29784796e38fe7c84417d556af4b740e98845ab8c57f8d50c
all runs: crashed: general protection fault in rdma_resolve_route
revisions tested: 2, total time: 23m1.840439937s (build: 15m50.238341091s, test: 6m11.00432717s)
the crash still happens on HEAD
commit msg: Linux 4.14.203
crash: general protection fault in rdma_resolve_route
IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready
IPv6: ADDRCONF(NETDEV_UP): vxcan1: link is not ready
8021q: adding VLAN 0 to HW filter on device batadv0
kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] PREEMPT SMP KASAN
Modules linked in:
CPU: 0 PID: 10601 Comm: syz-executor.0 Not tainted 4.14.203-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff888098a9a100 task.stack: ffff88808d610000
RIP: 0010:rdma_cap_ib_sa include/rdma/ib_verbs.h:2682 [inline]
RIP: 0010:rdma_resolve_route+0x10b/0x3040 drivers/infiniband/core/cma.c:2686
RSP: 0018:ffff88808d617960 EFLAGS: 00010202
RAX: 0000000000000000 RBX: ffff88809a1efb00 RCX: 0000000000000029
RDX: dffffc0000000000 RSI: 0000000000000001 RDI: 0000000000000148
RBP: ffff88808d617b20 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff88809a1efcb8
R13: 0000000000000004 R14: dffffc0000000000 R15: 0000000000000000
FS:  00007f3f3efd7700(0000) GS:ffff8880baa00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000000075c000 CR3: 00000000a5ce2000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 ucma_resolve_route+0xc0/0xf0 drivers/infiniband/core/ucma.c:740
 ucma_write+0x1f1/0x2c0 drivers/infiniband/core/ucma.c:1672
 __vfs_write+0xdb/0x840 fs/read_write.c:480
 vfs_write+0x150/0x4f0 fs/read_write.c:544
 SYSC_write fs/read_write.c:590 [inline]
 SyS_write+0x100/0x250 fs/read_write.c:582
 do_syscall_64+0x1c7/0x5b0 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x46/0xbb
RIP: 0033:0x459f79
RSP: 002b:00007f3f3efd6c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000459f79
RDX: 0000000000000010 RSI: 0000000020000200 RDI: 0000000000000004
RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f3f3efd76d4
R13: 00000000004d1978 R14: 00000000004e21d0 R15: 00000000ffffffff
Code: ff df 48 c1 ea 03 80 3c 02 00 0f 85 52 23 00 00 48 ba 00 00 00 00 00 fc ff df 48 8b 03 48 8d b8 48 01 00 00 48 89 f9 48 c1 e9 03 <80> 3c 11 00 0f 85 3a 23 00 00 45 0f b6 f7 49 c1 e6 04 4c 03 b0 
RIP: rdma_cap_ib_sa include/rdma/ib_verbs.h:2682 [inline] RSP: ffff88808d617960
RIP: rdma_resolve_route+0x10b/0x3040 drivers/infiniband/core/cma.c:2686 RSP: ffff88808d617960
---[ end trace e7434c86acb0808b ]---