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AFNElJ9uLDVRIjsgWucVspSecvo2dEGyi3d4VtWlQwNtBZgVbGue26O34Ql1Wy09caVK3FhDytoOnsCFF0Hix9E=@vger.kernel.org X-Gm-Message-State: AOJu0YwGJ7JlzAhojlanZnq25Jia/OK2ehVL6MldVOQfJFU0PINKkEBy SyFLSKsoWEEEg9m+ngjTqkJF0LWkj4ejOxrE9WNpQ0muoRI9/ffMey5RNoTv23Q9emIG1ECk+rS bOqF3DF+LP0wA9wyoRiGR1Ew3cssInBqZPlE85hGWcKFdwtiwemrl7vvASOk= Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6808:508a:b0:495:fa73:2e40 with SMTP id 5614622812f47-495fa7336c0mr3246730b6e.3.1782869544624; Tue, 30 Jun 2026 18:32:24 -0700 (PDT) Date: Tue, 30 Jun 2026 18:32:24 -0700 In-Reply-To: <6a38dd47.713c5d62.148f7.000c.GAE@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a446e28.854d4ab9.360e1d.0017.GAE@google.com> Subject: Re: [syzbot] [trace?] general protection fault in mtree_load From: syzbot To: bp@alien8.de, dave.hansen@linux.intel.com, hpa@zytor.com, linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org, mhiramat@kernel.org, mingo@redhat.com, oleg@redhat.com, olsajiri@gmail.com, peterz@infradead.org, syzkaller-bugs@googlegroups.com, tglx@kernel.org, x86@kernel.org Content-Type: text/plain; charset="UTF-8" syzbot has found a reproducer for the following issue on: HEAD commit: dc59e4fea9d8 Linux 7.2-rc1 git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=15c7d61c580000 kernel config: https://syzkaller.appspot.com/x/.config?x=f9bf5d2bfae96234 dashboard link: https://syzkaller.appspot.com/bug?extid=61ce80689253f42e6d80 compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=12bbb11c580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=130bf4ea580000 Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-dc59e4fe.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/1bc8aed8d2e8/vmlinux-dc59e4fe.xz kernel image: https://storage.googleapis.com/syzbot-assets/0b1fdfc4aa09/bzImage-dc59e4fe.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+61ce80689253f42e6d80@syzkaller.appspotmail.com Oops: general protection fault, probably for non-canonical address 0xdffffc0000000011: 0000 [#1] SMP KASAN NOPTI KASAN: null-ptr-deref in range [0x0000000000000088-0x000000000000008f] CPU: 3 UID: 0 PID: 6107 Comm: syz.0.85 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 RIP: 0010:mas_root lib/maple_tree.c:759 [inline] RIP: 0010:mas_start lib/maple_tree.c:1179 [inline] RIP: 0010:mtree_load+0x16d/0xa90 lib/maple_tree.c:5657 Code: 00 00 00 00 48 c7 44 24 78 ff ff ff ff e8 5b c8 74 f6 48 8b 5c 24 50 c6 84 24 9c 00 00 00 00 48 8d 7b 48 48 89 f8 48 c1 e8 03 <42> 80 3c 20 00 0f 85 d6 08 00 00 48 8b 5b 48 e8 3f 1a 08 00 31 ff RSP: 0018:ffffc9000412f740 EFLAGS: 00010206 RAX: 0000000000000011 RBX: 0000000000000040 RCX: ffffffff8b94b796 RDX: ffff888035462540 RSI: ffffffff8b94b7c5 RDI: 0000000000000088 RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000001 R10: 0000000000000001 R11: 0000000000000000 R12: dffffc0000000000 R13: ffff888013522280 R14: 0000200000ffc007 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff8880d63e0000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fc8aaa4cff8 CR3: 0000000038832000 CR4: 0000000000352ef0 Call Trace: vma_lookup include/linux/mm.h:4238 [inline] __in_uprobe_trampoline arch/x86/kernel/uprobes.c:766 [inline] __is_optimized arch/x86/kernel/uprobes.c:1056 [inline] is_optimized arch/x86/kernel/uprobes.c:1067 [inline] set_orig_insn+0x1ec/0x2a0 arch/x86/kernel/uprobes.c:1098 remove_breakpoint kernel/events/uprobes.c:1185 [inline] register_for_each_vma+0xbb7/0xdb0 kernel/events/uprobes.c:1318 uprobe_unregister_nosync+0x12a/0x1c0 kernel/events/uprobes.c:1343 bpf_uprobe_unregister kernel/trace/bpf_trace.c:2982 [inline] bpf_uprobe_multi_link_release+0xb3/0x1c0 kernel/trace/bpf_trace.c:2993 bpf_link_free+0xec/0x4a0 kernel/bpf/syscall.c:3395 bpf_link_put_direct kernel/bpf/syscall.c:3448 [inline] bpf_link_release+0x5d/0x80 kernel/bpf/syscall.c:3455 __fput+0x3ff/0xb50 fs/file_table.c:512 task_work_run+0x150/0x240 kernel/task_work.c:233 exit_task_work include/linux/task_work.h:40 [inline] do_exit+0x951/0x2ae0 kernel/exit.c:1004 do_group_exit+0xd5/0x2a0 kernel/exit.c:1147 get_signal+0x1ec7/0x21e0 kernel/signal.c:3038 arch_do_signal_or_restart+0x91/0x7e0 arch/x86/kernel/signal.c:337 __exit_to_user_mode_loop kernel/entry/common.c:66 [inline] exit_to_user_mode_loop+0x139/0x6f0 kernel/entry/common.c:101 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline] syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:230 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:318 [inline] do_syscall_64+0x666/0x870 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fc8a9b9de59 Code: Unable to access opcode bytes at 0x7fc8a9b9de2f. RSP: 002b:00007fc8aaa4d0e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 00007fc8a9e25fa8 RCX: 00007fc8a9b9de59 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007fc8a9e25fa8 RBP: 00007fc8a9e25fa0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fc8a9e26038 R14: 00007fff99db45c0 R15: 00007fff99db46a8 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:mas_root lib/maple_tree.c:759 [inline] RIP: 0010:mas_start lib/maple_tree.c:1179 [inline] RIP: 0010:mtree_load+0x16d/0xa90 lib/maple_tree.c:5657 Code: 00 00 00 00 48 c7 44 24 78 ff ff ff ff e8 5b c8 74 f6 48 8b 5c 24 50 c6 84 24 9c 00 00 00 00 48 8d 7b 48 48 89 f8 48 c1 e8 03 <42> 80 3c 20 00 0f 85 d6 08 00 00 48 8b 5b 48 e8 3f 1a 08 00 31 ff RSP: 0018:ffffc9000412f740 EFLAGS: 00010206 RAX: 0000000000000011 RBX: 0000000000000040 RCX: ffffffff8b94b796 RDX: ffff888035462540 RSI: ffffffff8b94b7c5 RDI: 0000000000000088 RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000001 R10: 0000000000000001 R11: 0000000000000000 R12: dffffc0000000000 R13: ffff888013522280 R14: 0000200000ffc007 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff8880d63e0000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fc8aaa4cff8 CR3: 0000000038832000 CR4: 0000000000352ef0 ---------------- Code disassembly (best guess): 0: 00 00 add %al,(%rax) 2: 00 00 add %al,(%rax) 4: 48 c7 44 24 78 ff ff movq $0xffffffffffffffff,0x78(%rsp) b: ff ff d: e8 5b c8 74 f6 call 0xf674c86d 12: 48 8b 5c 24 50 mov 0x50(%rsp),%rbx 17: c6 84 24 9c 00 00 00 movb $0x0,0x9c(%rsp) 1e: 00 1f: 48 8d 7b 48 lea 0x48(%rbx),%rdi 23: 48 89 f8 mov %rdi,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 42 80 3c 20 00 cmpb $0x0,(%rax,%r12,1) <-- trapping instruction 2f: 0f 85 d6 08 00 00 jne 0x90b 35: 48 8b 5b 48 mov 0x48(%rbx),%rbx 39: e8 3f 1a 08 00 call 0x81a7d 3e: 31 ff xor %edi,%edi --- 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.