#syz fix: bpf: Add necessary migrate_disable to range_tree. On 11/18/24 2:20 AM, syzbot wrote:
Hello, syzbot found the following issue on: HEAD commit: 379d5ee624ed Merge branch 'bpf-range_tree-for-bpf-arena' git tree: bpf-next console+strace: https://syzkaller.appspot.com/x/log.txt?x=115ecb5f980000 kernel config: https://syzkaller.appspot.com/x/.config?x=d2aeec8c0b2e420c dashboard link: https://syzkaller.appspot.com/bug?extid=fd2873203c2ed428828a 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=12636ce8580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=11f0f4c0580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/e83cf63a68cf/disk-379d5ee6.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/ff1f89f228ad/vmlinux-379d5ee6.xz kernel image: https://storage.googleapis.com/syzbot-assets/8a715c466ecd/bzImage-379d5ee6.xz The issue was bisected to: commit b795379757eb054925fbb6783559c86f01c1a614 Author: Alexei Starovoitov <ast@xxxxxxxxxx> Date: Fri Nov 8 02:56:15 2024 +0000 bpf: Introduce range_tree data structure and use it in bpf arena bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=10b2ab5f980000 final oops: https://syzkaller.appspot.com/x/report.txt?x=12b2ab5f980000 console output: https://syzkaller.appspot.com/x/log.txt?x=14b2ab5f980000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+fd2873203c2ed428828a@xxxxxxxxxxxxxxxxxxxxxxxxx Fixes: b795379757eb ("bpf: Introduce range_tree data structure and use it in bpf arena") BUG: using smp_processor_id() in preemptible [00000000] code: syz-executor373/5838 caller is bpf_mem_alloc+0x117/0x220 kernel/bpf/memalloc.c:903 CPU: 1 UID: 0 PID: 5838 Comm: syz-executor373 Not tainted 6.12.0-rc7-syzkaller-g379d5ee624ed #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/30/2024 Call Trace: <TASK> __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120 check_preemption_disabled+0x10e/0x120 lib/smp_processor_id.c:49 bpf_mem_alloc+0x117/0x220 kernel/bpf/memalloc.c:903 range_tree_set+0x971/0x1830 kernel/bpf/range_tree.c:238 arena_map_alloc+0x36f/0x440 kernel/bpf/arena.c:137 map_create+0x946/0x11c0 kernel/bpf/syscall.c:1441 __sys_bpf+0x6d1/0x810 kernel/bpf/syscall.c:5741 __do_sys_bpf kernel/bpf/syscall.c:5866 [inline] __se_sys_bpf kernel/bpf/syscall.c:5864 [inline] __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5864 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f5cb29a1329 Code: 48 83 c4 28 c3 e8 37 17 00 00 0f 1f 80 00 00 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffee3bcaa18 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007ffee3bcabf8 RCX: 00007f5cb29a1329 RDX: 0000000000000048 RSI: 0000000020003940 RDI: 0000000000000000 RBP: 00007f5cb2a14610 R08: 0000000000000000 R09: 0000000000000000 R10: 00000000ffffffff R11: 0000000000000246 R12: 0000000000000001 R13: 00007ffee3bcabe8 R14: 0000000000000001 R15: 0000000000000001 </TA --- 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. For information about bisection process see: https://goo.gl/tpsmEJ#bisection 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
