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Message-ID: <6917ac96.050a0220.3565dc.0045.GAE@google.com> Date: Fri, 14 Nov 2025 14:26:30 -0800 From: syzbot <syzbot+4aaf719f29251ec4637b@...kaller.appspotmail.com> To: anna-maria@...utronix.de, frederic@...nel.org, linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com, tglx@...utronix.de Subject: [syzbot] [kernel?] KMSAN: uninit-value in __enqueue_entity Hello, syzbot found the following issue on: HEAD commit: e9a6fb0bcdd7 Linux 6.18-rc5 git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=13728c12580000 kernel config: https://syzkaller.appspot.com/x/.config?x=cbf50e713aaa5cb0 dashboard link: https://syzkaller.appspot.com/bug?extid=4aaf719f29251ec4637b compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/88b4c5f8dd1b/disk-e9a6fb0b.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/c19e4972aa45/vmlinux-e9a6fb0b.xz kernel image: https://storage.googleapis.com/syzbot-assets/fe50db0896cc/bzImage-e9a6fb0b.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+4aaf719f29251ec4637b@...kaller.appspotmail.com ===================================================== BUG: KMSAN: uninit-value in __min_slice_update kernel/sched/fair.c:816 [inline] BUG: KMSAN: uninit-value in min_vruntime_update kernel/sched/fair.c:835 [inline] BUG: KMSAN: uninit-value in min_vruntime_cb_propagate kernel/sched/fair.c:842 [inline] BUG: KMSAN: uninit-value in rb_add_augmented_cached include/linux/rbtree_augmented.h:83 [inline] BUG: KMSAN: uninit-value in __enqueue_entity+0xa4d/0xcd0 kernel/sched/fair.c:853 __min_slice_update kernel/sched/fair.c:816 [inline] min_vruntime_update kernel/sched/fair.c:835 [inline] min_vruntime_cb_propagate kernel/sched/fair.c:842 [inline] rb_add_augmented_cached include/linux/rbtree_augmented.h:83 [inline] __enqueue_entity+0xa4d/0xcd0 kernel/sched/fair.c:853 enqueue_entity kernel/sched/fair.c:5286 [inline] enqueue_task_fair+0x100b/0x44a0 kernel/sched/fair.c:6973 enqueue_task+0x68/0x390 kernel/sched/core.c:2092 activate_task kernel/sched/core.c:2134 [inline] ttwu_do_activate+0x1dd/0x9d0 kernel/sched/core.c:3706 ttwu_queue kernel/sched/core.c:3969 [inline] try_to_wake_up+0xf83/0x1f50 kernel/sched/core.c:4293 wake_up_process+0x2a/0x40 kernel/sched/core.c:4424 hrtimer_wakeup+0x85/0xd0 kernel/time/hrtimer.c:2013 __run_hrtimer kernel/time/hrtimer.c:1777 [inline] __hrtimer_run_queues+0x559/0xd80 kernel/time/hrtimer.c:1841 hrtimer_interrupt+0x456/0xb80 kernel/time/hrtimer.c:1903 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1041 [inline] __sysvec_apic_timer_interrupt+0xaa/0x420 arch/x86/kernel/apic/apic.c:1058 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1052 [inline] sysvec_apic_timer_interrupt+0x7f/0x90 arch/x86/kernel/apic/apic.c:1052 asm_sysvec_apic_timer_interrupt+0x1f/0x30 arch/x86/include/asm/idtentry.h:697 __preempt_count_dec_and_test arch/x86/include/asm/preempt.h:95 [inline] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline] _raw_spin_unlock_irqrestore+0x33/0x60 kernel/locking/spinlock.c:194 spin_unlock_irqrestore include/linux/spinlock.h:406 [inline] free_pcppages_bulk+0xbe9/0xc10 mm/page_alloc.c:1492 free_frozen_page_commit+0x946/0x1270 mm/page_alloc.c:2868 __free_frozen_pages+0x799/0x14f0 mm/page_alloc.c:2934 ___free_pages+0xa5/0x1b0 mm/page_alloc.c:5264 __free_pages+0x21/0x30 mm/page_alloc.c:5302 vfree+0x589/0xa20 mm/vmalloc.c:3440 kvfree+0x3b/0x60 mm/slub.c:7145 translate_table+0x109f/0x3530 net/ipv6/netfilter/ip6_tables.c:751 do_replace net/ipv6/netfilter/ip6_tables.c:1154 [inline] do_ip6t_set_ctl+0x148e/0x1da0 net/ipv6/netfilter/ip6_tables.c:1644 nf_setsockopt+0x4fb/0x550 net/netfilter/nf_sockopt.c:101 ipv6_setsockopt+0x1c3/0x300 net/ipv6/ipv6_sockglue.c:978 tcp_setsockopt+0x157/0x180 net/ipv4/tcp.c:4142 sock_common_setsockopt+0xf5/0x140 net/core/sock.c:3912 do_sock_setsockopt net/socket.c:2360 [inline] __sys_setsockopt+0x43e/0x580 net/socket.c:2385 __do_sys_setsockopt net/socket.c:2391 [inline] __se_sys_setsockopt net/socket.c:2388 [inline] __x64_sys_setsockopt+0xf4/0x1a0 net/socket.c:2388 x64_sys_call+0x27c9/0x3e30 arch/x86/include/generated/asm/syscalls_64.h:55 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xd9/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Uninit was created at: __netns_tracker_alloc include/net/net_namespace.h:362 [inline] sk_alloc+0x5de/0x8a0 net/core/sock.c:2311 __netlink_create net/netlink/af_netlink.c:628 [inline] __netlink_kernel_create+0x19b/0xcc0 net/netlink/af_netlink.c:2020 netlink_kernel_create include/linux/netlink.h:62 [inline] iscsi_transport_init+0x285/0x4e0 drivers/scsi/scsi_transport_iscsi.c:4983 do_one_initcall+0x237/0xb60 init/main.c:1283 do_initcall_level+0x157/0x2e0 init/main.c:1345 do_initcalls+0x176/0x310 init/main.c:1361 do_basic_setup+0x1d/0x30 init/main.c:1380 kernel_init_freeable+0x275/0x4a0 init/main.c:1593 kernel_init+0x2f/0x5e0 init/main.c:1483 ret_from_fork+0x1f5/0x4c0 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 CPU: 1 UID: 0 PID: 3272 Comm: syz.3.9286 Tainted: G W syzkaller #0 PREEMPT(none) Tainted: [W]=WARN Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025 ===================================================== --- 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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