Hello, syzbot found the following issue on: HEAD commit: 7efd0a74039f Merge tag 'ata-6.9-rc4' of git://git.kernel.o.. git tree: upstream console+strace: https://syzkaller.appspot.com/x/log.txt?x=1492cb93180000 kernel config: https://syzkaller.appspot.com/x/.config?x=b5bc506ebba90cbf dashboard link: https://syzkaller.appspot.com/bug?extid=1971e47e5210c718db3c compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=11ce7393180000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=155451eb180000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/9fd81e15f087/disk-7efd0a74.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/2e4915d51565/vmlinux-7efd0a74.xz kernel image: https://storage.googleapis.com/syzbot-assets/110eeae33f94/bzImage-7efd0a74.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+1971e47e5210c718db3c@xxxxxxxxxxxxxxxxxxxxxxxxx ===================================================== BUG: KMSAN: uninit-value in __htab_map_lookup_elem kernel/bpf/hashtab.c:691 [inline] BUG: KMSAN: uninit-value in htab_lru_percpu_map_lookup_percpu_elem+0x3f8/0x630 kernel/bpf/hashtab.c:2343 __htab_map_lookup_elem kernel/bpf/hashtab.c:691 [inline] htab_lru_percpu_map_lookup_percpu_elem+0x3f8/0x630 kernel/bpf/hashtab.c:2343 ____bpf_map_lookup_percpu_elem kernel/bpf/helpers.c:133 [inline] bpf_map_lookup_percpu_elem+0x67/0x90 kernel/bpf/helpers.c:130 ___bpf_prog_run+0x13fe/0xe0f0 kernel/bpf/core.c:1997 __bpf_prog_run32+0xb2/0xe0 kernel/bpf/core.c:2236 bpf_dispatcher_nop_func include/linux/bpf.h:1234 [inline] __bpf_prog_run include/linux/filter.h:657 [inline] bpf_prog_run include/linux/filter.h:664 [inline] __bpf_trace_run kernel/trace/bpf_trace.c:2381 [inline] bpf_trace_run2+0x116/0x300 kernel/trace/bpf_trace.c:2420 __bpf_trace_kfree+0x29/0x40 include/trace/events/kmem.h:94 trace_kfree include/trace/events/kmem.h:94 [inline] kfree+0x6a5/0xa30 mm/slub.c:4377 security_task_free+0x115/0x150 security/security.c:3032 __put_task_struct+0x17f/0x730 kernel/fork.c:976 put_task_struct include/linux/sched/task.h:138 [inline] delayed_put_task_struct+0x8a/0x280 kernel/exit.c:229 rcu_do_batch kernel/rcu/tree.c:2196 [inline] rcu_core+0xa59/0x1e70 kernel/rcu/tree.c:2471 rcu_core_si+0x12/0x20 kernel/rcu/tree.c:2488 __do_softirq+0x1c0/0x7d7 kernel/softirq.c:554 invoke_softirq kernel/softirq.c:428 [inline] __irq_exit_rcu kernel/softirq.c:633 [inline] irq_exit_rcu+0x6a/0x130 kernel/softirq.c:645 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1043 [inline] sysvec_apic_timer_interrupt+0x83/0x90 arch/x86/kernel/apic/apic.c:1043 asm_sysvec_apic_timer_interrupt+0x1f/0x30 arch/x86/include/asm/idtentry.h:702 __msan_metadata_ptr_for_load_8+0x31/0x40 mm/kmsan/instrumentation.c:92 filter_irq_stacks+0x60/0x1a0 kernel/stacktrace.c:397 stack_depot_save_flags+0x2c/0x6e0 lib/stackdepot.c:609 stack_depot_save+0x12/0x20 lib/stackdepot.c:685 __msan_poison_alloca+0x106/0x1b0 mm/kmsan/instrumentation.c:285 arch_local_save_flags arch/x86/include/asm/irqflags.h:67 [inline] arch_local_irq_save arch/x86/include/asm/irqflags.h:103 [inline] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:108 [inline] _raw_spin_lock_irqsave+0x35/0xc0 kernel/locking/spinlock.c:162 remove_wait_queue+0x36/0x270 kernel/sched/wait.c:54 do_wait+0x34a/0x530 kernel/exit.c:1640 kernel_wait4+0x2ab/0x480 kernel/exit.c:1790 __do_sys_wait4 kernel/exit.c:1818 [inline] __se_sys_wait4 kernel/exit.c:1814 [inline] __x64_sys_wait4+0x14e/0x310 kernel/exit.c:1814 x64_sys_call+0x6e6/0x3b50 arch/x86/include/generated/asm/syscalls_64.h:62 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcf/0x1e0 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f Local variable stack created at: __bpf_prog_run32+0x43/0xe0 kernel/bpf/core.c:2236 bpf_dispatcher_nop_func include/linux/bpf.h:1234 [inline] __bpf_prog_run include/linux/filter.h:657 [inline] bpf_prog_run include/linux/filter.h:664 [inline] __bpf_trace_run kernel/trace/bpf_trace.c:2381 [inline] bpf_trace_run2+0x116/0x300 kernel/trace/bpf_trace.c:2420 CPU: 0 PID: 5018 Comm: strace-static-x Not tainted 6.9.0-rc3-syzkaller-00355-g7efd0a74039f #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 ===================================================== --- 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@xxxxxxxxxxxxxxxx. 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 syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing. 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
