[Android 6.1] general protection fault in vsscanf
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syzbot
6:26 AM (14 hours ago) 6:26 AM
to syzkaller-a...@googlegroups.com
Hello,
syzbot found the following issue on:
HEAD commit: 92668decd5e0 UPSTREAM: locking/rtmutex: Skip remove_waiter..
git tree: android14-6.1
console+strace: https://syzkaller.appspot.com/x/log.txt?x=15df3679580000
kernel config: https://syzkaller.appspot.com/x/.config?x=6af0777879025b2
dashboard link: https://syzkaller.appspot.com/bug?extid=a514d4b7318a8f80f989
compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=17a476c6580000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=15a36679580000
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/d489fb35aec8/disk-92668dec.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/33e640edad62/vmlinux-92668dec.xz
kernel image: https://storage.googleapis.com/syzbot-assets/e0bb511e52c2/bzImage-92668dec.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+a514d4...@syzkaller.appspotmail.com
general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
CPU: 1 PID: 305 Comm: syz-executor281 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:vsscanf+0x196/0x24b0 lib/vsprintf.c:3446
Code: 48 c7 c6 90 02 8e 87 e8 48 9e 7e fc 41 83 fe 25 74 4d 45 85 f6 0f 84 b6 21 00 00 48 ff c3 48 89 5c 24 78 4c 89 f8 48 c1 e8 03 <42> 0f b6 04 28 84 c0 0f 85 4f 1b 00 00 41 0f b6 1f 45 0f b6 f6 44
RSP: 0018:ffffc90000e975e0 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffffffff85b0d901 RCX: 0000000000000001
RDX: ffffffff84f2cd48 RSI: ffffffff878e0290 RDI: 0000000000000030
RBP: ffffc90000e97710 R08: ffff8881103c0000 R09: 0000000000000002
R10: 0000000000000025 R11: 0000000000000000 R12: ffffffff85b0d900
R13: dffffc0000000000 R14: 0000000000000030 R15: 0000000000000000
FS: 00005555818ae3c0(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000000040 CR3: 0000000122864000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
sscanf+0xdf/0x130 lib/vsprintf.c:3704
split_huge_pages_write+0x37a/0x10d0 mm/huge_memory.c:3286
full_proxy_write+0x121/0x1d0 fs/debugfs/file.c:244
vfs_write+0x3fb/0xd00 fs/read_write.c:582
ksys_write+0x14a/0x260 fs/read_write.c:637
__do_sys_write fs/read_write.c:649 [inline]
__se_sys_write fs/read_write.c:646 [inline]
__x64_sys_write+0x7b/0x90 fs/read_write.c:646
x64_sys_call+0x27b/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:2
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f3fddebdc39
Code: c0 79 93 eb d5 48 8d 7c 1d 00 eb 99 0f 1f 44 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 d8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffcb50955c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0067756265642f2e RCX: 00007f3fddebdc39
RDX: 0000000000000015 RSI: 0000200000000180 RDI: 0000000000000003
RBP: 0000000000000001 R08: 0000000000000000 R09: 00007ffcb50956f8
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffcb50956e8
R13: 0000000000000002 R14: 00007f3fddf4eca0 R15: 0000000000000002
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:vsscanf+0x196/0x24b0 lib/vsprintf.c:3446
Code: 48 c7 c6 90 02 8e 87 e8 48 9e 7e fc 41 83 fe 25 74 4d 45 85 f6 0f 84 b6 21 00 00 48 ff c3 48 89 5c 24 78 4c 89 f8 48 c1 e8 03 <42> 0f b6 04 28 84 c0 0f 85 4f 1b 00 00 41 0f b6 1f 45 0f b6 f6 44
RSP: 0018:ffffc90000e975e0 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffffffff85b0d901 RCX: 0000000000000001
RDX: ffffffff84f2cd48 RSI: ffffffff878e0290 RDI: 0000000000000030
RBP: ffffc90000e97710 R08: ffff8881103c0000 R09: 0000000000000002
R10: 0000000000000025 R11: 0000000000000000 R12: ffffffff85b0d900
R13: dffffc0000000000 R14: 0000000000000030 R15: 0000000000000000
FS: 00005555818ae3c0(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000000040 CR3: 0000000122864000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
0: 48 c7 c6 90 02 8e 87 mov $0xffffffff878e0290,%rsi
7: e8 48 9e 7e fc call 0xfc7e9e54
c: 41 83 fe 25 cmp $0x25,%r14d
10: 74 4d je 0x5f
12: 45 85 f6 test %r14d,%r14d
15: 0f 84 b6 21 00 00 je 0x21d1
1b: 48 ff c3 inc %rbx
1e: 48 89 5c 24 78 mov %rbx,0x78(%rsp)
23: 4c 89 f8 mov %r15,%rax
26: 48 c1 e8 03 shr $0x3,%rax
* 2a: 42 0f b6 04 28 movzbl (%rax,%r13,1),%eax <-- trapping instruction
2f: 84 c0 test %al,%al
31: 0f 85 4f 1b 00 00 jne 0x1b86
37: 41 0f b6 1f movzbl (%r15),%ebx
3b: 45 0f b6 f6 movzbl %r14b,%r14d
3f: 44 rex.R
---
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 syzk...@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
syzbot found the following issue on:
HEAD commit: 92668decd5e0 UPSTREAM: locking/rtmutex: Skip remove_waiter..
git tree: android14-6.1
console+strace: https://syzkaller.appspot.com/x/log.txt?x=15df3679580000
kernel config: https://syzkaller.appspot.com/x/.config?x=6af0777879025b2
dashboard link: https://syzkaller.appspot.com/bug?extid=a514d4b7318a8f80f989
compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=17a476c6580000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=15a36679580000
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/d489fb35aec8/disk-92668dec.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/33e640edad62/vmlinux-92668dec.xz
kernel image: https://storage.googleapis.com/syzbot-assets/e0bb511e52c2/bzImage-92668dec.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+a514d4...@syzkaller.appspotmail.com
general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
CPU: 1 PID: 305 Comm: syz-executor281 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:vsscanf+0x196/0x24b0 lib/vsprintf.c:3446
Code: 48 c7 c6 90 02 8e 87 e8 48 9e 7e fc 41 83 fe 25 74 4d 45 85 f6 0f 84 b6 21 00 00 48 ff c3 48 89 5c 24 78 4c 89 f8 48 c1 e8 03 <42> 0f b6 04 28 84 c0 0f 85 4f 1b 00 00 41 0f b6 1f 45 0f b6 f6 44
RSP: 0018:ffffc90000e975e0 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffffffff85b0d901 RCX: 0000000000000001
RDX: ffffffff84f2cd48 RSI: ffffffff878e0290 RDI: 0000000000000030
RBP: ffffc90000e97710 R08: ffff8881103c0000 R09: 0000000000000002
R10: 0000000000000025 R11: 0000000000000000 R12: ffffffff85b0d900
R13: dffffc0000000000 R14: 0000000000000030 R15: 0000000000000000
FS: 00005555818ae3c0(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000000040 CR3: 0000000122864000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
sscanf+0xdf/0x130 lib/vsprintf.c:3704
split_huge_pages_write+0x37a/0x10d0 mm/huge_memory.c:3286
full_proxy_write+0x121/0x1d0 fs/debugfs/file.c:244
vfs_write+0x3fb/0xd00 fs/read_write.c:582
ksys_write+0x14a/0x260 fs/read_write.c:637
__do_sys_write fs/read_write.c:649 [inline]
__se_sys_write fs/read_write.c:646 [inline]
__x64_sys_write+0x7b/0x90 fs/read_write.c:646
x64_sys_call+0x27b/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:2
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f3fddebdc39
Code: c0 79 93 eb d5 48 8d 7c 1d 00 eb 99 0f 1f 44 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 d8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffcb50955c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0067756265642f2e RCX: 00007f3fddebdc39
RDX: 0000000000000015 RSI: 0000200000000180 RDI: 0000000000000003
RBP: 0000000000000001 R08: 0000000000000000 R09: 00007ffcb50956f8
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffcb50956e8
R13: 0000000000000002 R14: 00007f3fddf4eca0 R15: 0000000000000002
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:vsscanf+0x196/0x24b0 lib/vsprintf.c:3446
Code: 48 c7 c6 90 02 8e 87 e8 48 9e 7e fc 41 83 fe 25 74 4d 45 85 f6 0f 84 b6 21 00 00 48 ff c3 48 89 5c 24 78 4c 89 f8 48 c1 e8 03 <42> 0f b6 04 28 84 c0 0f 85 4f 1b 00 00 41 0f b6 1f 45 0f b6 f6 44
RSP: 0018:ffffc90000e975e0 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffffffff85b0d901 RCX: 0000000000000001
RDX: ffffffff84f2cd48 RSI: ffffffff878e0290 RDI: 0000000000000030
RBP: ffffc90000e97710 R08: ffff8881103c0000 R09: 0000000000000002
R10: 0000000000000025 R11: 0000000000000000 R12: ffffffff85b0d900
R13: dffffc0000000000 R14: 0000000000000030 R15: 0000000000000000
FS: 00005555818ae3c0(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000000040 CR3: 0000000122864000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
0: 48 c7 c6 90 02 8e 87 mov $0xffffffff878e0290,%rsi
7: e8 48 9e 7e fc call 0xfc7e9e54
c: 41 83 fe 25 cmp $0x25,%r14d
10: 74 4d je 0x5f
12: 45 85 f6 test %r14d,%r14d
15: 0f 84 b6 21 00 00 je 0x21d1
1b: 48 ff c3 inc %rbx
1e: 48 89 5c 24 78 mov %rbx,0x78(%rsp)
23: 4c 89 f8 mov %r15,%rax
26: 48 c1 e8 03 shr $0x3,%rax
* 2a: 42 0f b6 04 28 movzbl (%rax,%r13,1),%eax <-- trapping instruction
2f: 84 c0 test %al,%al
31: 0f 85 4f 1b 00 00 jne 0x1b86
37: 41 0f b6 1f movzbl (%r15),%ebx
3b: 45 0f b6 f6 movzbl %r14b,%r14d
3f: 44 rex.R
---
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 syzk...@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
syzbot
6:10 PM (2 hours ago) 6:10 PM
to syzkaller-a...@googlegroups.com
Hello,
syzbot found the following issue on:
HEAD commit: a825653ab7af Revert "skmsg: convert struct sk_msg_sg::copy..
syzbot found the following issue on:
git tree: android13-5.15-lts
console+strace: https://syzkaller.appspot.com/x/log.txt?x=12473815580000
kernel config: https://syzkaller.appspot.com/x/.config?x=43676e801f1929a9
dashboard link: https://syzkaller.appspot.com/bug?extid=4c7d82f3815030b06612
compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=113f5a25580000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=16473815580000
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/45afce6d1a05/disk-a825653a.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/c0af5ca8d028/vmlinux-a825653a.xz
kernel image: https://storage.googleapis.com/syzbot-assets/3d3d0039c7cc/bzImage-a825653a.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:vsscanf+0x196/0x24b0 lib/vsprintf.c:3450
Code: 48 c7 c6 80 cf 99 86 e8 c8 a4 f7 fe 41 83 fe 25 74 4d 45 85 f6 0f 84 b6 21 00 00 48 ff c3 48 89 5c 24 78 4c 89 f8 48 c1 e8 03 <42> 0f b6 04 28 84 c0 0f 85 4f 1b 00 00 41 0f b6 1f 45 0f b6 f6 44
RSP: 0018:ffffc900009875e0 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffffffff854b5541 RCX: 0000000000000001
RDX: ffffffff82721758 RSI: ffffffff8699cf80 RDI: 0000000000000030
RBP: ffffc90000987710 R08: ffff88811df4a780 R09: 0000000000000002
R10: 0000000000000025 R11: 0000000000000000 R12: ffffffff854b5540
R13: dffffc0000000000 R14: 0000000000000030 R15: 0000000000000000
FS: 000055556aba23c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000000240 CR3: 0000000125c9e000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
sscanf+0xdf/0x130 lib/vsprintf.c:3708
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
split_huge_pages_write+0x30d/0xfc0 mm/huge_memory.c:3134
full_proxy_write+0x10f/0x1c0 fs/debugfs/file.c:244
vfs_write+0x404/0xfd0 fs/read_write.c:592
ksys_write+0x14a/0x260 fs/read_write.c:647
__do_sys_write fs/read_write.c:659 [inline]
__se_sys_write fs/read_write.c:656 [inline]
__x64_sys_write+0x7b/0x90 fs/read_write.c:656
x64_sys_call+0x8ef/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:2
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f45e65e0c39
Code: c0 79 93 eb d5 48 8d 7c 1d 00 eb 99 0f 1f 44 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 d8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffde66a46d8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0067756265642f2e RCX: 00007f45e65e0c39
RDX: 0000000000000005 RSI: 0000200000000600 RDI: 0000000000000003
RBP: 0000000000000001 R08: 0000000000000000 R09: 00007ffde66a4808
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffde66a47f8
R13: 0000000000000002 R14: 00007f45e6671ca0 R15: 0000000000000002
</TASK>
Modules linked in:
---[ end trace bfe45dab523c64d9 ]---
RIP: 0010:vsscanf+0x196/0x24b0 lib/vsprintf.c:3450
Code: 48 c7 c6 80 cf 99 86 e8 c8 a4 f7 fe 41 83 fe 25 74 4d 45 85 f6 0f 84 b6 21 00 00 48 ff c3 48 89 5c 24 78 4c 89 f8 48 c1 e8 03 <42> 0f b6 04 28 84 c0 0f 85 4f 1b 00 00 41 0f b6 1f 45 0f b6 f6 44
RSP: 0018:ffffc900009875e0 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffffffff854b5541 RCX: 0000000000000001
RDX: ffffffff82721758 RSI: ffffffff8699cf80 RDI: 0000000000000030
RBP: ffffc90000987710 R08: ffff88811df4a780 R09: 0000000000000002
R10: 0000000000000025 R11: 0000000000000000 R12: ffffffff854b5540
R13: dffffc0000000000 R14: 0000000000000030 R15: 0000000000000000
FS: 000055556aba23c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000000240 CR3: 0000000125c9e000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
0: 48 c7 c6 80 cf 99 86 mov $0xffffffff8699cf80,%rsi
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
7: e8 c8 a4 f7 fe call 0xfef7a4d4
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