Hello, syzbot found the following issue on: HEAD commit: 4f55aa85a874 Merge tag 'fbdev-for-6.9-rc1' of git://git.ke.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=11a8dc6e180000 kernel config: https://syzkaller.appspot.com/x/.config?x=e6bd769cb793b98a dashboard link: https://syzkaller.appspot.com/bug?extid=603bcd9b0bf1d94dbb9b compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 userspace arch: i386 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/991fcbce770a/disk-4f55aa85.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/bd716e5d2c3c/vmlinux-4f55aa85.xz kernel image: https://storage.googleapis.com/syzbot-assets/bf1151dbf5fc/bzImage-4f55aa85.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+603bcd9b0bf1d94dbb9b@xxxxxxxxxxxxxxxxxxxxxxxxx ===================================================== BUG: KMSAN: uninit-value in trie_delete_elem+0xc0/0xbe0 kernel/bpf/lpm_trie.c:448 trie_delete_elem+0xc0/0xbe0 kernel/bpf/lpm_trie.c:448 ____bpf_map_delete_elem kernel/bpf/helpers.c:77 [inline] bpf_map_delete_elem+0x5c/0x80 kernel/bpf/helpers.c:73 ___bpf_prog_run+0x13fe/0xe0f0 kernel/bpf/core.c:1997 __bpf_prog_run128+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_run3+0x132/0x320 kernel/trace/bpf_trace.c:2421 __bpf_trace_kmem_cache_free+0x31/0x40 include/trace/events/kmem.h:114 trace_kmem_cache_free include/trace/events/kmem.h:114 [inline] kmem_cache_free+0x6da/0xa80 mm/slub.c:4343 mt_free_one lib/maple_tree.c:172 [inline] mas_destroy+0x56c9/0x5cd0 lib/maple_tree.c:5612 mas_store_prealloc+0x39c/0x550 lib/maple_tree.c:5487 vma_iter_store mm/internal.h:1290 [inline] vma_complete+0x9b0/0x14e0 mm/mmap.c:535 __split_vma+0x1037/0x1200 mm/mmap.c:2385 split_vma mm/mmap.c:2411 [inline] vma_modify+0x37c/0x4c0 mm/mmap.c:2452 vma_modify_flags include/linux/mm.h:3303 [inline] mprotect_fixup+0x790/0x1170 mm/mprotect.c:635 do_mprotect_pkey+0x1159/0x1850 mm/mprotect.c:809 __do_sys_mprotect mm/mprotect.c:830 [inline] __se_sys_mprotect mm/mprotect.c:827 [inline] __ia32_sys_mprotect+0x98/0xf0 mm/mprotect.c:827 do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline] __do_fast_syscall_32+0xba/0x120 arch/x86/entry/common.c:321 do_fast_syscall_32+0x38/0x80 arch/x86/entry/common.c:346 do_SYSENTER_32+0x1f/0x30 arch/x86/entry/common.c:384 entry_SYSENTER_compat_after_hwframe+0x7a/0x84 Local variable stack created at: __bpf_prog_run128+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_run3+0x132/0x320 kernel/trace/bpf_trace.c:2421 CPU: 0 PID: 14388 Comm: syz-executor.4 Not tainted 6.8.0-syzkaller-13006-g4f55aa85a874 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/29/2024 ===================================================== --- 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 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
