From: syzbot <syzbot+61ce80689253f42e6d80@syzkaller.appspotmail.com>
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, peterz@infradead.org,
syzkaller-bugs@googlegroups.com, tglx@kernel.org,
x86@kernel.org
Subject: [syzbot] [trace?] general protection fault in mtree_load
Date: Sun, 21 Jun 2026 23:59:19 -0700 [thread overview]
Message-ID: <6a38dd47.713c5d62.148f7.000c.GAE@google.com> (raw)
Hello,
syzbot found the following issue on:
HEAD commit: 6b5a2b7d9bc1 Merge tag 'trace-tools-v7.2' of git://git.ker..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=16d56986580000
kernel config: https://syzkaller.appspot.com/x/.config?x=ea6584355d75e0cd
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
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-6b5a2b7d.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/b3cb0499fbe9/vmlinux-6b5a2b7d.xz
kernel image: https://storage.googleapis.com/syzbot-assets/47cfbe57f6ea/bzImage-6b5a2b7d.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: 24402 Comm: syz.4.5217 Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
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 6b bd 84 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 6f 1a 08 00 31 ff
RSP: 0018:ffffc900039c76d8 EFLAGS: 00010206
RAX: 0000000000000011 RBX: 0000000000000040 RCX: ffffffff8b848746
RDX: ffff888041b6a540 RSI: ffffffff8b848775 RDI: 0000000000000088
RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000001
R10: 0000000000000001 R11: 000000000000751b R12: dffffc0000000000
R13: ffff88802693adc0 R14: 00001fff904365a7 R15: dffffc0000000000
FS: 0000000000000000(0000) GS:ffff8880d665f000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f44aa04f156 CR3: 00000000364d5000 CR4: 0000000000352ef0
Call Trace:
<TASK>
vma_lookup include/linux/mm.h:4204 [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:2936 [inline]
bpf_uprobe_multi_link_release+0xb3/0x1c0 kernel/trace/bpf_trace.c:2947
bpf_link_free+0xec/0x4a0 kernel/bpf/syscall.c:3273
bpf_link_put_direct kernel/bpf/syscall.c:3326 [inline]
bpf_link_release+0x5d/0x80 kernel/bpf/syscall.c:3333
__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]
ret_from_fork+0x932/0xd50 arch/x86/kernel/process.c:167
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
</TASK>
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 6b bd 84 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 6f 1a 08 00 31 ff
RSP: 0018:ffffc900039c76d8 EFLAGS: 00010206
RAX: 0000000000000011 RBX: 0000000000000040 RCX: ffffffff8b848746
RDX: ffff888041b6a540 RSI: ffffffff8b848775 RDI: 0000000000000088
RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000001
R10: 0000000000000001 R11: 000000000000751b R12: dffffc0000000000
R13: ffff88802693adc0 R14: 00001fff904365a7 R15: dffffc0000000000
FS: 0000000000000000(0000) GS:ffff8880d665f000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c433cbf CR3: 00000000429b6000 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 6b bd 84 f6 call 0xf684bd7d
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 6f 1a 08 00 call 0x81aad
3e: 31 ff xor %edi,%edi
---
This report is generated by a bot. It may contain errors.
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next reply other threads:[~2026-06-22 6:59 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-06-22 6:59 syzbot [this message]
2026-06-22 13:04 ` [syzbot] [trace?] general protection fault in mtree_load Oleg Nesterov
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