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, olsajiri@gmail.com,
peterz@infradead.org, syzkaller-bugs@googlegroups.com,
tglx@kernel.org, x86@kernel.org
Subject: Re: [syzbot] [trace?] general protection fault in mtree_load
Date: Tue, 30 Jun 2026 18:32:24 -0700 [thread overview]
Message-ID: <6a446e28.854d4ab9.360e1d.0017.GAE@google.com> (raw)
In-Reply-To: <6a38dd47.713c5d62.148f7.000c.GAE@google.com>
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:
<TASK>
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
</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 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.
next prev parent reply other threads:[~2026-07-01 1:32 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-06-22 6:59 [syzbot] [trace?] general protection fault in mtree_load syzbot
2026-06-22 13:04 ` Oleg Nesterov
2026-06-24 7:49 ` Jiri Olsa
2026-07-01 1:32 ` syzbot [this message]
2026-07-01 9:09 ` Oleg Nesterov
2026-07-01 9:42 ` syzbot
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=6a446e28.854d4ab9.360e1d.0017.GAE@google.com \
--to=syzbot+61ce80689253f42e6d80@syzkaller.appspotmail.com \
--cc=bp@alien8.de \
--cc=dave.hansen@linux.intel.com \
--cc=hpa@zytor.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-trace-kernel@vger.kernel.org \
--cc=mhiramat@kernel.org \
--cc=mingo@redhat.com \
--cc=oleg@redhat.com \
--cc=olsajiri@gmail.com \
--cc=peterz@infradead.org \
--cc=syzkaller-bugs@googlegroups.com \
--cc=tglx@kernel.org \
--cc=x86@kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.