KMSAN: uninit-value in cma_make_mc_event

Status: auto-closed as invalid on 2022/05/04 18:27
Subsystems: rdma
[Documentation on labels]
Reported-by: syzbot+8fcbb77276d43cc8b693@syzkaller.appspotmail.com
First crash: 1722d, last: 1722d
▶ ▼ Discussions (3)
Title Replies (including bot) Last reply
[PATCH rdma-rc] RDMA/cma: Limit join multicast to UD QP type only 7 (7) 2022/04/13 08:07
[PATCH rdma-rc] RDMA/cma: Clear all multicast request fields 10 (10) 2022/01/17 19:06
[syzbot] KMSAN: uninit-value in cma_make_mc_event 0 (1) 2022/01/05 12:03

Sample crash report:
=====================================================
BUG: KMSAN: uninit-value in cma_set_qkey drivers/infiniband/core/cma.c:510 [inline]
BUG: KMSAN: uninit-value in cma_make_mc_event+0xb73/0xe00 drivers/infiniband/core/cma.c:4570
 cma_set_qkey drivers/infiniband/core/cma.c:510 [inline]
 cma_make_mc_event+0xb73/0xe00 drivers/infiniband/core/cma.c:4570
 cma_iboe_join_multicast drivers/infiniband/core/cma.c:4782 [inline]
 rdma_join_multicast+0x2b83/0x30a0 drivers/infiniband/core/cma.c:4814
 ucma_process_join+0xa76/0xf60 drivers/infiniband/core/ucma.c:1479
 ucma_join_multicast+0x1e3/0x250 drivers/infiniband/core/ucma.c:1546
 ucma_write+0x639/0x6d0 drivers/infiniband/core/ucma.c:1732
 vfs_write+0x8ce/0x2030 fs/read_write.c:588
 ksys_write+0x28c/0x520 fs/read_write.c:643
 __do_sys_write fs/read_write.c:655 [inline]
 __se_sys_write fs/read_write.c:652 [inline]
 __ia32_sys_write+0xdb/0x120 fs/read_write.c:652
 do_syscall_32_irqs_on arch/x86/entry/common.c:114 [inline]
 __do_fast_syscall_32+0x96/0xf0 arch/x86/entry/common.c:180
 do_fast_syscall_32+0x34/0x70 arch/x86/entry/common.c:205
 do_SYSENTER_32+0x1b/0x20 arch/x86/entry/common.c:248
 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c

Local variable ib.i created at:
 cma_iboe_join_multicast drivers/infiniband/core/cma.c:4737 [inline]
 rdma_join_multicast+0x586/0x30a0 drivers/infiniband/core/cma.c:4814
 ucma_process_join+0xa76/0xf60 drivers/infiniband/core/ucma.c:1479

CPU: 0 PID: 29874 Comm: syz-executor.3 Not tainted 5.16.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
=====================================================

Crashes (2):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2021/12/11 07:04 https://github.com/google/kmsan.git master 8b936c96768e 49ca1f59 .config console log report info ci-upstream-kmsan-gce-386 KMSAN: uninit-value in cma_make_mc_event
2021/12/11 07:03 https://github.com/google/kmsan.git master 8b936c96768e 49ca1f59 .config console log report info ci-upstream-kmsan-gce-386 KMSAN: uninit-value in cma_make_mc_event
* Struck through repros no longer work on HEAD.