On 4/6/24 9:59 AM, syzbot wrote:
Hello, syzbot found the following issue on: HEAD commit: 026e680b0a08 Merge tag 'pwm/for-6.9-rc3-fixes' of git://gi.. git tree: upstream console+strace: https://syzkaller.appspot.com/x/log.txt?x=173c55e5180000 kernel config: https://syzkaller.appspot.com/x/.config?x=5112b3f484393436 dashboard link: https://syzkaller.appspot.com/bug?extid=b8d77b9bb107fa1bd641 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=1495512d180000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=143c2415180000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/3b5659d2008c/disk-026e680b.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/7fd1552fafde/vmlinux-026e680b.xz kernel image: https://storage.googleapis.com/syzbot-assets/ba622b1b0ec4/bzImage-026e680b.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+b8d77b9bb107fa1bd641@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_elem+0x39a/0x580 kernel/bpf/hashtab.c:2326 __htab_map_lookup_elem kernel/bpf/hashtab.c:691 [inline] htab_lru_percpu_map_lookup_elem+0x39a/0x580 kernel/bpf/hashtab.c:2326 ____bpf_map_lookup_elem kernel/bpf/helpers.c:42 [inline] bpf_map_lookup_elem+0x5c/0x80 kernel/bpf/helpers.c:38 ___bpf_prog_run+0x13fe/0xe0f0 kernel/bpf/core.c:1997 __bpf_prog_run64+0xb5/0xe0 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 kvfree+0x69/0x80 mm/util.c:680 __bpf_prog_put_rcu+0x37/0xf0 kernel/bpf/syscall.c:2232 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 __preempt_count_dec_and_test arch/x86/include/asm/preempt.h:94 [inline] flush_tlb_mm_range+0x294/0x320 arch/x86/mm/tlb.c:1036 flush_tlb_page arch/x86/include/asm/tlbflush.h:254 [inline] ptep_clear_flush+0x166/0x1c0 mm/pgtable-generic.c:101 wp_page_copy mm/memory.c:3329 [inline] do_wp_page+0x419d/0x66e0 mm/memory.c:3660 handle_pte_fault mm/memory.c:5316 [inline] __handle_mm_fault mm/memory.c:5441 [inline] handle_mm_fault+0x5b76/0xce00 mm/memory.c:5606 do_user_addr_fault arch/x86/mm/fault.c:1362 [inline] handle_page_fault arch/x86/mm/fault.c:1505 [inline] exc_page_fault+0x419/0x730 arch/x86/mm/fault.c:1563 asm_exc_page_fault+0x2b/0x30 arch/x86/include/asm/idtentry.h:623 Local variable stack created at: __bpf_prog_run64+0x45/0xe0 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: 1 PID: 5015 Comm: syz-executor232 Not tainted 6.9.0-rc2-syzkaller-00002-g026e680b0a08 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 =====================================================
#syz dup: [syzbot] [bpf?] [net?] KMSAN: uninit-value in dev_map_lookup_elem
