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AJvYcCVcHaUWC49cJYJuGN9JZyg+zRRRubSLFycAqK0+RTlzsVxW0pXMKrYxA6EYQdPg/VDlvdQ=@vger.kernel.org X-Gm-Message-State: AOJu0YzRNlltq0FrQPHuvq+GUwOBuvDAIfp4wh0YtjA5Cfae/qBd7Kx2 /qHH6DUlEfJtmK3Vq+qDY/U7yjLaqnFIuJrxZ2y8Lv7VO8JUwfhBQ89eR4koREU8rap3ddL6o7K gj3I5Ep9a4N9/V42wc2A89xMfKxMl9VKEoKfn6yVmvTfu2pDDi97e93OolJA= X-Google-Smtp-Source: AGHT+IGpINRHIv5Qt32rieZ9qoCXjUUE4pZkVobeBJhF3H1pMQxen0t2kAFPSkvY9JyRo5WLjfqN1vyRWgobXOcnOqcEdVNC73SN Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6602:3589:b0:864:a1fe:1e41 with SMTP id ca18e2360f4ac-86a24cdd7a1mr2812239139f.13.1747833099708; Wed, 21 May 2025 06:11:39 -0700 (PDT) Date: Wed, 21 May 2025 06:11:39 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <682dd10b.a00a0220.29bc26.028e.GAE@google.com> Subject: [syzbot] [bpf?] WARNING in bpf_check (4) From: syzbot To: andrii@kernel.org, ast@kernel.org, bpf@vger.kernel.org, daniel@iogearbox.net, eddyz87@gmail.com, haoluo@google.com, john.fastabend@gmail.com, jolsa@kernel.org, kpsingh@kernel.org, linux-kernel@vger.kernel.org, martin.lau@linux.dev, sdf@fomichev.me, song@kernel.org, syzkaller-bugs@googlegroups.com, yonghong.song@linux.dev Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 172a9d94339c Merge tag '6.15-rc6-smb3-client-fixes' of git.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=11d15ef4580000 kernel config: https://syzkaller.appspot.com/x/.config?x=4f080d149583fe67 dashboard link: https://syzkaller.appspot.com/bug?extid=0ef84a7bdf5301d4cbec compiler: arm-linux-gnueabi-gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 userspace arch: arm syz repro: https://syzkaller.appspot.com/x/repro.syz?x=130462d4580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=14efaef4580000 Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/98a89b9f34e4/non_bootable_disk-172a9d94.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/88f3b6a8815a/vmlinux-172a9d94.xz kernel image: https://storage.googleapis.com/syzbot-assets/8835063aa13d/zImage-172a9d94.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+0ef84a7bdf5301d4cbec@syzkaller.appspotmail.com ------------[ cut here ]------------ WARNING: CPU: 1 PID: 3102 at kernel/bpf/verifier.c:20723 opt_subreg_zext_lo32_rnd_hi32 kernel/bpf/verifier.c:20723 [inline] WARNING: CPU: 1 PID: 3102 at kernel/bpf/verifier.c:20723 bpf_check+0x2d58/0x2ed4 kernel/bpf/verifier.c:24078 Modules linked in: Kernel panic - not syncing: kernel: panic_on_warn set ... CPU: 1 UID: 0 PID: 3102 Comm: syz-executor107 Not tainted 6.15.0-rc6-syzkaller #0 PREEMPT Hardware name: ARM-Versatile Express Call trace: [<802019e4>] (dump_backtrace) from [<80201ae0>] (show_stack+0x18/0x1c arch/arm/kernel/traps.c:257) r7:00000000 r6:828227fc r5:00000000 r4:82257e84 [<80201ac8>] (show_stack) from [<8021ff7c>] (__dump_stack lib/dump_stack.c:94 [inline]) [<80201ac8>] (show_stack) from [<8021ff7c>] (dump_stack_lvl+0x54/0x7c lib/dump_stack.c:120) [<8021ff28>] (dump_stack_lvl) from [<8021ffbc>] (dump_stack+0x18/0x1c lib/dump_stack.c:129) r5:00000000 r4:82a70d4c [<8021ffa4>] (dump_stack) from [<802025f8>] (panic+0x120/0x374 kernel/panic.c:354) [<802024d8>] (panic) from [<802619e8>] (check_panic_on_warn kernel/panic.c:243 [inline]) [<802024d8>] (panic) from [<802619e8>] (get_taint+0x0/0x1c kernel/panic.c:238) r3:8280c604 r2:00000001 r1:8223ea4c r0:8224654c r7:804020d0 [<80261974>] (check_panic_on_warn) from [<80261b4c>] (__warn+0x80/0x188 kernel/panic.c:749) [<80261acc>] (__warn) from [<80261dcc>] (warn_slowpath_fmt+0x178/0x1f4 kernel/panic.c:776) r8:00000009 r7:8225e3a4 r6:df989c44 r5:844f0000 r4:00000000 [<80261c58>] (warn_slowpath_fmt) from [<804020d0>] (opt_subreg_zext_lo32_rnd_hi32 kernel/bpf/verifier.c:20723 [inline]) [<80261c58>] (warn_slowpath_fmt) from [<804020d0>] (bpf_check+0x2d58/0x2ed4 kernel/bpf/verifier.c:24078) r10:00000002 r9:84850000 r8:00000004 r7:00000002 r6:00000003 r5:000000c3 r4:ffffffff [<803ff378>] (bpf_check) from [<803d66d0>] (bpf_prog_load+0x68c/0xc20 kernel/bpf/syscall.c:2971) r10:844f0000 r9:842a6f30 r8:00000048 r7:df989d90 r6:00000000 r5:00000000 r4:df989ec0 [<803d6044>] (bpf_prog_load) from [<803d7e24>] (__sys_bpf+0x578/0x1fd0 kernel/bpf/syscall.c:5834) r10:b5403587 r9:2000e000 r8:00000000 r7:00000000 r6:00000005 r5:df989e90 r4:00000048 [<803d78ac>] (__sys_bpf) from [<803d9e1c>] (__do_sys_bpf kernel/bpf/syscall.c:5941 [inline]) [<803d78ac>] (__sys_bpf) from [<803d9e1c>] (sys_bpf+0x2c/0x48 kernel/bpf/syscall.c:5939) r10:00000182 r9:844f0000 r8:8020029c r7:00000182 r6:0008e048 r5:00000000 r4:ffffffff [<803d9df0>] (sys_bpf) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdf989fa8 to 0xdf989ff0) 9fa0: ffffffff 00000000 00000005 2000e000 00000048 00000000 9fc0: ffffffff 00000000 0008e048 00000182 00000002 0000fd90 000f4240 00000000 9fe0: 7ebc8c70 7ebc8c60 000106bc 0002e810 Rebooting in 86400 seconds.. --- 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@googlegroups.com. 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