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Message-ID: <6979e79b.050a0220.c9109.003a.GAE@google.com> Date: Wed, 28 Jan 2026 02:40:27 -0800 From: syzbot <syzbot+f840ef7a3be3a331093f@...kaller.appspotmail.com> To: anna-maria@...utronix.de, frederic@...nel.org, linux-kernel@...r.kernel.org, mingo@...nel.org, syzkaller-bugs@...glegroups.com, tglx@...nel.org Subject: [syzbot] [kernel?] KMSAN: uninit-value in task_tick_fair Hello, syzbot found the following issue on: HEAD commit: c133687c2eae Merge tag 'spi-fix-v6.19-rc6' of git://git.ke.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=15a2613a580000 kernel config: https://syzkaller.appspot.com/x/.config?x=8bf02b9e495b9fcd dashboard link: https://syzkaller.appspot.com/bug?extid=f840ef7a3be3a331093f compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/b53ff2d374b2/disk-c133687c.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/f9212dd806c1/vmlinux-c133687c.xz kernel image: https://storage.googleapis.com/syzbot-assets/a04bd8516c52/bzImage-c133687c.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+f840ef7a3be3a331093f@...kaller.appspotmail.com ===================================================== BUG: KMSAN: uninit-value in entity_tick kernel/sched/fair.c:5526 [inline] BUG: KMSAN: uninit-value in task_tick_fair+0x46e/0xbe0 kernel/sched/fair.c:13374 entity_tick kernel/sched/fair.c:5526 [inline] task_tick_fair+0x46e/0xbe0 kernel/sched/fair.c:13374 sched_tick+0x270/0xdf0 kernel/sched/core.c:5535 update_process_times+0x27e/0x2d0 kernel/time/timer.c:2479 tick_sched_handle kernel/time/tick-sched.c:298 [inline] tick_nohz_handler+0x5a0/0x7f0 kernel/time/tick-sched.c:319 __run_hrtimer kernel/time/hrtimer.c:1777 [inline] __hrtimer_run_queues+0x559/0xd70 kernel/time/hrtimer.c:1841 hrtimer_interrupt+0x456/0xb70 kernel/time/hrtimer.c:1903 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1045 [inline] __sysvec_apic_timer_interrupt+0xaa/0x420 arch/x86/kernel/apic/apic.c:1062 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline] sysvec_apic_timer_interrupt+0x7f/0x90 arch/x86/kernel/apic/apic.c:1056 asm_sysvec_apic_timer_interrupt+0x1f/0x30 arch/x86/include/asm/idtentry.h:697 memmove+0x28/0x1b0 arch/x86/lib/memmove_64.S:45 Uninit was created at: __alloc_frozen_pages_noprof+0x41c/0xaa0 mm/page_alloc.c:5263 alloc_pages_mpol+0x328/0x860 mm/mempolicy.c:2486 alloc_frozen_pages_noprof+0xf6/0x200 mm/mempolicy.c:2557 alloc_slab_page mm/slub.c:3075 [inline] allocate_slab+0x1ea/0x1700 mm/slub.c:3248 new_slab mm/slub.c:3302 [inline] ___slab_alloc+0x1048/0x38c0 mm/slub.c:4656 __slab_alloc+0xa3/0x180 mm/slub.c:4779 __slab_alloc_node mm/slub.c:4855 [inline] slab_alloc_node mm/slub.c:5251 [inline] __kmalloc_cache_noprof+0x9e0/0x1710 mm/slub.c:5775 kmalloc_noprof include/linux/slab.h:957 [inline] kzalloc_noprof include/linux/slab.h:1094 [inline] device_private_init drivers/base/core.c:3534 [inline] device_add+0x101/0x1c10 drivers/base/core.c:3585 usb_add_gadget+0x72e/0xe70 drivers/usb/gadget/udc/core.c:1434 usb_add_gadget_udc_release drivers/usb/gadget/udc/core.c:1484 [inline] usb_add_gadget_udc+0x11f/0x1a0 drivers/usb/gadget/udc/core.c:1531 dummy_udc_probe+0xbe6/0x10f0 drivers/usb/gadget/udc/dummy_hcd.c:1099 platform_probe+0x213/0x370 drivers/base/platform.c:1446 call_driver_probe drivers/base/dd.c:-1 [inline] really_probe+0x4d4/0xdc0 drivers/base/dd.c:659 __driver_probe_device+0x25e/0x370 drivers/base/dd.c:801 driver_probe_device+0x70/0x8f0 drivers/base/dd.c:831 __device_attach_driver+0x4ee/0x950 drivers/base/dd.c:959 bus_for_each_drv+0x3e3/0x680 drivers/base/bus.c:500 __device_attach+0x3c5/0x5f0 drivers/base/dd.c:1031 device_initial_probe+0x126/0x170 drivers/base/dd.c:1086 bus_probe_device+0x287/0x550 drivers/base/bus.c:574 device_add+0x12a9/0x1c10 drivers/base/core.c:3689 platform_device_add+0x7ee/0xab0 drivers/base/platform.c:757 dummy_hcd_init+0xb2f/0x11b0 drivers/usb/gadget/udc/dummy_hcd.c:2866 do_one_initcall+0x22b/0xad0 init/main.c:1378 do_initcall_level+0x157/0x2e0 init/main.c:1440 do_initcalls+0x176/0x310 init/main.c:1456 do_basic_setup+0x1d/0x30 init/main.c:1475 kernel_init_freeable+0x213/0x430 init/main.c:1688 kernel_init+0x2f/0x5e0 init/main.c:1578 ret_from_fork+0x207/0x6f0 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246 CPU: 0 UID: 0 PID: 7329 Comm: syz.7.249 Tainted: G L syzkaller #0 PREEMPT(voluntary) Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/13/2026 ===================================================== --- 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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