syzbot has found a reproducer for the following issue on: HEAD commit: 317c7bc0ef03 Merge tag 'mmc-v6.9-rc1' of git://git.kernel... git tree: upstream console+strace: https://syzkaller.appspot.com/x/log.txt?x=121ddb95180000 kernel config: https://syzkaller.appspot.com/x/.config?x=e2599baf258ef795 dashboard link: https://syzkaller.appspot.com/bug?extid=603bcd9b0bf1d94dbb9b 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=15af8b0d180000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1590903d180000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/eea0b23c3f68/disk-317c7bc0.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/440f7aea55b5/vmlinux-317c7bc0.xz kernel image: https://storage.googleapis.com/syzbot-assets/ecb91ede16f9/bzImage-317c7bc0.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_run96+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 bpf_free_used_maps kernel/bpf/core.c:2723 [inline] bpf_prog_free_deferred+0x390/0xc70 kernel/bpf/core.c:2761 process_one_work kernel/workqueue.c:3254 [inline] process_scheduled_works+0xa81/0x1bd0 kernel/workqueue.c:3335 worker_thread+0xea5/0x1560 kernel/workqueue.c:3416 kthread+0x3e2/0x540 kernel/kthread.c:388 ret_from_fork+0x6d/0x90 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:243 Local variable stack created at: __bpf_prog_run96+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: 0 PID: 7 Comm: kworker/0:0 Not tainted 6.9.0-rc1-syzkaller-00178-g317c7bc0ef03 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 Workqueue: events bpf_prog_free_deferred ===================================================== --- 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.
