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Message-ID: <689b7aec.050a0220.7f033.0135.GAE@google.com> Date: Tue, 12 Aug 2025 10:33:32 -0700 From: syzbot <syzbot+2d494ba0c96e096f1c11@...kaller.appspotmail.com> To: davem@...emloft.net, edumazet@...gle.com, herbert@...dor.apana.org.au, horms@...nel.org, kuba@...nel.org, linux-kernel@...r.kernel.org, netdev@...r.kernel.org, pabeni@...hat.com, steffen.klassert@...unet.com, syzkaller-bugs@...glegroups.com Subject: [syzbot] [net?] KMSAN: uninit-value in pfkey_send_notify Hello, syzbot found the following issue on: HEAD commit: c30a13538d9f Merge tag 'bpf-fixes' of git://git.kernel.org.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=17bb7ea2580000 kernel config: https://syzkaller.appspot.com/x/.config?x=9ee158fa735566e2 dashboard link: https://syzkaller.appspot.com/bug?extid=2d494ba0c96e096f1c11 compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/d7d8c2a837fb/disk-c30a1353.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/9e67e86fa1fd/vmlinux-c30a1353.xz kernel image: https://storage.googleapis.com/syzbot-assets/731ca108689d/bzImage-c30a1353.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+2d494ba0c96e096f1c11@...kaller.appspotmail.com ===================================================== BUG: KMSAN: uninit-value in arch_atomic_read arch/x86/include/asm/atomic.h:23 [inline] BUG: KMSAN: uninit-value in raw_atomic_read include/linux/atomic/atomic-arch-fallback.h:457 [inline] BUG: KMSAN: uninit-value in atomic_read include/linux/atomic/atomic-instrumented.h:33 [inline] BUG: KMSAN: uninit-value in pfkey_send_notify+0x291/0xe60 net/key/af_key.c:3079 arch_atomic_read arch/x86/include/asm/atomic.h:23 [inline] raw_atomic_read include/linux/atomic/atomic-arch-fallback.h:457 [inline] atomic_read include/linux/atomic/atomic-instrumented.h:33 [inline] pfkey_send_notify+0x291/0xe60 net/key/af_key.c:3079 km_state_notify net/xfrm/xfrm_state.c:2738 [inline] km_state_expired net/xfrm/xfrm_state.c:2752 [inline] xfrm_timer_handler+0x464/0x1320 net/xfrm/xfrm_state.c:718 __run_hrtimer kernel/time/hrtimer.c:1761 [inline] __hrtimer_run_queues+0x556/0xd80 kernel/time/hrtimer.c:1825 hrtimer_run_softirq+0x18e/0x760 kernel/time/hrtimer.c:1842 handle_softirqs+0x166/0x6e0 kernel/softirq.c:579 __do_softirq+0x14/0x1b kernel/softirq.c:613 do_softirq+0x99/0x100 kernel/softirq.c:480 __local_bh_enable_ip+0xa1/0xb0 kernel/softirq.c:407 __raw_spin_unlock_bh include/linux/spinlock_api_smp.h:167 [inline] _raw_spin_unlock_bh+0x2d/0x40 kernel/locking/spinlock.c:210 spin_unlock_bh include/linux/spinlock.h:396 [inline] __fib6_clean_all net/ipv6/ip6_fib.c:2317 [inline] fib6_clean_all+0x1fa/0x300 net/ipv6/ip6_fib.c:2326 rt6_sync_up+0x157/0x180 net/ipv6/route.c:4891 addrconf_notify+0x1cd7/0x1d10 net/ipv6/addrconf.c:3728 notifier_call_chain kernel/notifier.c:85 [inline] raw_notifier_call_chain+0xdd/0x410 kernel/notifier.c:453 call_netdevice_notifiers_info+0x1ac/0x2b0 net/core/dev.c:2229 netif_state_change+0x3af/0x410 net/core/dev.c:1583 do_setlink+0x1b33/0x7e50 net/core/rtnetlink.c:3390 rtnl_group_changelink net/core/rtnetlink.c:3775 [inline] __rtnl_newlink net/core/rtnetlink.c:3929 [inline] rtnl_newlink+0x2b96/0x3a90 net/core/rtnetlink.c:4057 rtnetlink_rcv_msg+0x106f/0x14b0 net/core/rtnetlink.c:6946 netlink_rcv_skb+0x54d/0x680 net/netlink/af_netlink.c:2552 rtnetlink_rcv+0x35/0x40 net/core/rtnetlink.c:6973 netlink_unicast_kernel net/netlink/af_netlink.c:1320 [inline] netlink_unicast+0xf04/0x12b0 net/netlink/af_netlink.c:1346 netlink_sendmsg+0x10b3/0x1250 net/netlink/af_netlink.c:1896 sock_sendmsg_nosec net/socket.c:714 [inline] __sock_sendmsg+0x330/0x3d0 net/socket.c:729 ____sys_sendmsg+0x7e0/0xd80 net/socket.c:2614 ___sys_sendmsg+0x271/0x3b0 net/socket.c:2668 __sys_sendmsg net/socket.c:2700 [inline] __do_sys_sendmsg net/socket.c:2705 [inline] __se_sys_sendmsg net/socket.c:2703 [inline] __x64_sys_sendmsg+0x211/0x3e0 net/socket.c:2703 x64_sys_call+0x1dfd/0x3e20 arch/x86/include/generated/asm/syscalls_64.h:47 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xd9/0x210 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Uninit was created at: slab_post_alloc_hook mm/slub.c:4186 [inline] slab_alloc_node mm/slub.c:4229 [inline] __do_kmalloc_node mm/slub.c:4364 [inline] __kvmalloc_node_noprof+0xa36/0x1530 mm/slub.c:5052 kvmalloc_array_node_noprof include/linux/slab.h:1065 [inline] io_alloc_cache_init+0x53/0x150 io_uring/alloc_cache.c:25 io_ring_ctx_alloc+0x617/0x14f0 io_uring/io_uring.c:337 io_uring_create+0x32f/0x1400 io_uring/io_uring.c:3743 io_uring_setup io_uring/io_uring.c:3890 [inline] __do_sys_io_uring_setup io_uring/io_uring.c:3924 [inline] __se_sys_io_uring_setup+0x572/0x590 io_uring/io_uring.c:3915 __x64_sys_io_uring_setup+0x78/0xb0 io_uring/io_uring.c:3915 x64_sys_call+0x35b4/0x3e20 arch/x86/include/generated/asm/syscalls_64.h:426 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xd9/0x210 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f CPU: 0 UID: 0 PID: 14064 Comm: syz.4.2614 Tainted: G W 6.16.0-syzkaller-12250-gc30a13538d9f #0 PREEMPT(none) Tainted: [W]=WARN Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 ===================================================== --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@...glegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup
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