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KMSAN: uninit-value in __ipv6_dev_mc_inc (2)

Status: upstream: reported on 2025/05/09 20:00
Subsystems: net
[Documentation on labels]
Reported-by: syzbot+3735d5f00e991698985a@syzkaller.appspotmail.com
First crash: 9d03h, last: 57m
▶ ▼ Discussions (1)
Title Replies (including bot) Last reply
[syzbot] [net?] KMSAN: uninit-value in __ipv6_dev_mc_inc (2) 0 (1) 2025/05/09 20:00
▶ ▼ Similar bugs (1)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KMSAN: uninit-value in __ipv6_dev_mc_inc net 14 1186d 1253d 0/28 auto-closed as invalid on 2022/05/17 06:51

Sample crash report:
=====================================================
BUG: KMSAN: uninit-value in __ipv6_dev_mc_inc+0x4f0/0x1640 net/ipv6/mcast.c:966
 __ipv6_dev_mc_inc+0x4f0/0x1640 net/ipv6/mcast.c:966
 ipv6_dev_mc_inc+0x38/0x50 net/ipv6/mcast.c:997
 addrconf_join_solict net/ipv6/addrconf.c:2242 [inline]
 addrconf_dad_begin net/ipv6/addrconf.c:4103 [inline]
 addrconf_dad_work+0x401/0x1d10 net/ipv6/addrconf.c:4231
 process_one_work kernel/workqueue.c:3238 [inline]
 process_scheduled_works+0xb97/0x1d90 kernel/workqueue.c:3319
 worker_thread+0xedf/0x1590 kernel/workqueue.c:3400
 kthread+0xd59/0xf00 kernel/kthread.c:464
 ret_from_fork+0x6e/0x90 arch/x86/kernel/process.c:153
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

Local variable maddr.i.i created at:
 addrconf_join_solict net/ipv6/addrconf.c:2236 [inline]
 addrconf_dad_begin net/ipv6/addrconf.c:4103 [inline]
 addrconf_dad_work+0x244/0x1d10 net/ipv6/addrconf.c:4231
 process_one_work kernel/workqueue.c:3238 [inline]
 process_scheduled_works+0xb97/0x1d90 kernel/workqueue.c:3319

CPU: 1 UID: 0 PID: 1822 Comm: kworker/u8:8 Not tainted 6.15.0-rc6-syzkaller-00234-g83a896549f92 #0 PREEMPT(undef) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Workqueue: ipv6_addrconf addrconf_dad_work
=====================================================

Crashes (30):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/05/17 04:50 upstream 83a896549f92 f41472b0 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in __ipv6_dev_mc_inc
2025/05/17 03:02 upstream 83a896549f92 f41472b0 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in __ipv6_dev_mc_inc
2025/05/17 02:07 upstream 83a896549f92 f41472b0 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in __ipv6_dev_mc_inc
2025/05/17 02:07 upstream 83a896549f92 f41472b0 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in __ipv6_dev_mc_inc
2025/05/16 04:06 upstream f1f2797f8a24 cfde8269 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in __ipv6_dev_mc_inc
2025/05/15 17:00 upstream 02ddfb981de8 d6b2ee52 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in __ipv6_dev_mc_inc
2025/05/15 00:53 upstream 02ddfb981de8 a4fa04ef .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in __ipv6_dev_mc_inc
2025/05/14 10:43 upstream 02ddfb981de8 7344edeb .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in __ipv6_dev_mc_inc
2025/05/13 21:52 upstream 02ddfb981de8 7344edeb .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in __ipv6_dev_mc_inc
2025/05/11 02:12 upstream 02ddfb981de8 77908e5f .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in __ipv6_dev_mc_inc
2025/05/09 16:18 upstream 02ddfb981de8 bb813bcc .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in __ipv6_dev_mc_inc
2025/05/08 14:05 upstream 02ddfb981de8 dbf35fa1 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in __ipv6_dev_mc_inc
2025/05/08 03:59 upstream 02ddfb981de8 dbf35fa1 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in __ipv6_dev_mc_inc
2025/05/17 06:05 upstream 83a896549f92 f41472b0 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in __ipv6_dev_mc_inc
2025/05/16 16:50 upstream fee3e843b309 cfde8269 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in __ipv6_dev_mc_inc
2025/05/16 16:49 upstream fee3e843b309 cfde8269 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in __ipv6_dev_mc_inc
2025/05/15 15:54 upstream 02ddfb981de8 d6b2ee52 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in __ipv6_dev_mc_inc
2025/05/15 02:04 upstream 02ddfb981de8 a4fa04ef .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in __ipv6_dev_mc_inc
2025/05/15 02:04 upstream 02ddfb981de8 a4fa04ef .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in __ipv6_dev_mc_inc
2025/05/14 21:35 upstream 02ddfb981de8 a4fa04ef .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in __ipv6_dev_mc_inc
2025/05/14 21:34 upstream 02ddfb981de8 a4fa04ef .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in __ipv6_dev_mc_inc
2025/05/14 06:14 upstream 02ddfb981de8 7344edeb .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in __ipv6_dev_mc_inc
2025/05/12 23:39 upstream 02ddfb981de8 f6671af7 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in __ipv6_dev_mc_inc
2025/05/11 09:49 upstream 02ddfb981de8 77908e5f .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in __ipv6_dev_mc_inc
2025/05/09 23:26 upstream 02ddfb981de8 bb813bcc .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in __ipv6_dev_mc_inc
2025/05/08 14:50 upstream 02ddfb981de8 dbf35fa1 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in __ipv6_dev_mc_inc
2025/05/08 14:50 upstream 02ddfb981de8 dbf35fa1 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in __ipv6_dev_mc_inc
2025/05/08 14:26 upstream 02ddfb981de8 dbf35fa1 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in __ipv6_dev_mc_inc
2025/05/08 14:25 upstream 02ddfb981de8 dbf35fa1 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in __ipv6_dev_mc_inc
2025/05/08 08:13 upstream 02ddfb981de8 dbf35fa1 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in __ipv6_dev_mc_inc
* Struck through repros no longer work on HEAD.