bisecting fixing commit since b98aebd298246df37b472c52a2ee1023256d02e3
building syzkaller on b602d64b5991c147af88f1e0f8d961c8b4b4a748
testing commit b98aebd298246df37b472c52a2ee1023256d02e3 with gcc (GCC) 8.1.0
kernel signature: 18a4b267ede23724a7083595816b1e77a5ed568337fc3ea2f39541ee9a4a387e
all runs: crashed: general protection fault in rdma_resolve_route
testing current HEAD c6db52a88798e5a0dfef80041ad4d33cc8cf04eb
testing commit c6db52a88798e5a0dfef80041ad4d33cc8cf04eb with gcc (GCC) 8.1.0
kernel signature: c5441f66e6269559541d9062bd6012e32cb4ff72948bffdaaa837b4468431e4c
all runs: crashed: general protection fault in rdma_resolve_route
revisions tested: 2, total time: 26m3.501866752s (build: 17m23.759710153s, test: 7m43.068966996s)
the crash still happens on HEAD
commit msg: Linux 4.14.183
crash: general protection fault in rdma_resolve_route
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: 16582 Comm: syz-executor.1 Not tainted 4.14.183-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8880867602c0 task.stack: ffff888079668000
RIP: 0010:rdma_cap_ib_sa include/rdma/ib_verbs.h:2682 [inline]
RIP: 0010:rdma_resolve_route+0x10b/0x2eb0 drivers/infiniband/core/cma.c:2680
RSP: 0018:ffff88807966f960 EFLAGS: 00010202
RAX: 0000000000000000 RBX: ffff8880a62f6dc0 RCX: 0000000000000029
RDX: dffffc0000000000 RSI: 0000000000000001 RDI: 0000000000000148
RBP: ffff88807966fb20 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff8880a62f6f78
R13: 0000000000000004 R14: dffffc0000000000 R15: 0000000000000000
FS:  00007fc0b90a4700(0000) GS:ffff8880aee00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005593a2306ae0 CR3: 0000000098177000 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: 0033:0x459ef9
RSP: 002b:00007fc0b90a3c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000459ef9
RDX: 0000000000000010 RSI: 0000000020000200 RDI: 0000000000000004
RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fc0b90a46d4
R13: 00000000004d18f8 R14: 00000000004e2150 R15: 00000000ffffffff
Code: ff df 48 c1 ea 03 80 3c 02 00 0f 85 e6 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 ce 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: ffff88807966f960
RIP: rdma_resolve_route+0x10b/0x2eb0 drivers/infiniband/core/cma.c:2680 RSP: ffff88807966f960
---[ end trace 791a34c67439f0db ]---