[syzbot] [kernel?] general protection fault in put_ipc_ns
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syzbot
Nov 17, 2025, 6:17:33 AMNov 17
to linux-...@vger.kernel.org, syzkall...@googlegroups.com
Hello,
syzbot found the following issue on:
HEAD commit: 6d7e7251d03f Add linux-next specific files for 20251113
git tree: linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=15e4c914580000
kernel config: https://syzkaller.appspot.com/x/.config?x=8a6b17620801a7cb
dashboard link: https://syzkaller.appspot.com/bug?extid=b4c65e7d749285a82467
compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=154ec658580000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=162aeb42580000
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/ab5308631192/disk-6d7e7251.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/53e266b1dfe2/vmlinux-6d7e7251.xz
kernel image: https://storage.googleapis.com/syzbot-assets/a24e6bca1ac0/bzImage-6d7e7251.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+b4c65e...@syzkaller.appspotmail.com
RSP: 002b:00007fff968e5608 EFLAGS: 00000246 ORIG_RAX: 0000000000000110
RAX: ffffffffffffffda RBX: 00007fe58a3e5fa0 RCX: 00007fe58a18f6c9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000000006a040000
RBP: 00007fff968e5660 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 00007fe58a3e5fa0 R14: 00007fe58a3e5fa0 R15: 0000000000000001
</TASK>
Oops: general protection fault, probably for non-canonical address 0xdffffc000000012f: 0000 [#1] SMP KASAN PTI
KASAN: null-ptr-deref in range [0x0000000000000978-0x000000000000097f]
CPU: 1 UID: 0 PID: 6021 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:is_ns_init_id include/linux/ns_common.h:25 [inline]
RIP: 0010:__ns_ref_dec_and_lock include/linux/ns_common.h:108 [inline]
RIP: 0010:put_ipc_ns+0x7f/0x3d0 ipc/namespace.c:204
Code: b8 f1 f1 f1 f1 00 f3 f3 f3 4b 89 44 3d 00 e8 08 6b 85 fd 48 85 db 0f 84 ea 00 00 00 4c 8d a3 88 09 00 00 4d 89 e6 49 c1 ee 03 <43> 80 3c 3e 00 74 08 4c 89 e7 e8 02 c4 eb fd 4d 8b 3c 24 31 ff 4c
RSP: 0018:ffffc900034a7c60 EFLAGS: 00010203
RAX: ffffffff843c7548 RBX: fffffffffffffff4 RCX: ffff88805c080000
RDX: 0000000000000000 RSI: 0000000000000002 RDI: fffffffffffffff4
RBP: ffffc900034a7cf8 R08: ffff8880325cd59f R09: 1ffff110064b9ab3
R10: dffffc0000000000 R11: ffffed10064b9ab4 R12: 000000000000097c
R13: 1ffff92000694f8c R14: 000000000000012f R15: dffffc0000000000
FS: 0000555582176500(0000) GS:ffff888125b78000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000555582176808 CR3: 00000000751d2000 CR4: 00000000003526f0
Call Trace:
<TASK>
nsproxy_free+0x1ef/0x7c0 kernel/nsproxy.c:67
__free_nsproxy_free kernel/nsproxy.c:76 [inline]
create_new_namespaces+0x47a/0x540 kernel/nsproxy.c:132
unshare_nsproxy_namespaces+0x11c/0x170 kernel/nsproxy.c:197
ksys_unshare+0x4c8/0x8c0 kernel/fork.c:3129
__do_sys_unshare kernel/fork.c:3200 [inline]
__se_sys_unshare kernel/fork.c:3198 [inline]
__x64_sys_unshare+0x38/0x50 kernel/fork.c:3198
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fe58a18f6c9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fff968e5608 EFLAGS: 00000246 ORIG_RAX: 0000000000000110
RAX: ffffffffffffffda RBX: 00007fe58a3e5fa0 RCX: 00007fe58a18f6c9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000000006a040000
RBP: 00007fff968e5660 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 00007fe58a3e5fa0 R14: 00007fe58a3e5fa0 R15: 0000000000000001
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:is_ns_init_id include/linux/ns_common.h:25 [inline]
RIP: 0010:__ns_ref_dec_and_lock include/linux/ns_common.h:108 [inline]
RIP: 0010:put_ipc_ns+0x7f/0x3d0 ipc/namespace.c:204
Code: b8 f1 f1 f1 f1 00 f3 f3 f3 4b 89 44 3d 00 e8 08 6b 85 fd 48 85 db 0f 84 ea 00 00 00 4c 8d a3 88 09 00 00 4d 89 e6 49 c1 ee 03 <43> 80 3c 3e 00 74 08 4c 89 e7 e8 02 c4 eb fd 4d 8b 3c 24 31 ff 4c
RSP: 0018:ffffc900034a7c60 EFLAGS: 00010203
RAX: ffffffff843c7548 RBX: fffffffffffffff4 RCX: ffff88805c080000
RDX: 0000000000000000 RSI: 0000000000000002 RDI: fffffffffffffff4
RBP: ffffc900034a7cf8 R08: ffff8880325cd59f R09: 1ffff110064b9ab3
R10: dffffc0000000000 R11: ffffed10064b9ab4 R12: 000000000000097c
R13: 1ffff92000694f8c R14: 000000000000012f R15: dffffc0000000000
FS: 0000555582176500(0000) GS:ffff888125b78000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000555582176808 CR3: 00000000751d2000 CR4: 00000000003526f0
----------------
Code disassembly (best guess):
0: b8 f1 f1 f1 f1 mov $0xf1f1f1f1,%eax
5: 00 f3 add %dh,%bl
7: f3 f3 4b 89 44 3d 00 repz xrelease mov %rax,0x0(%r13,%r15,1)
e: e8 08 6b 85 fd call 0xfd856b1b
13: 48 85 db test %rbx,%rbx
16: 0f 84 ea 00 00 00 je 0x106
1c: 4c 8d a3 88 09 00 00 lea 0x988(%rbx),%r12
23: 4d 89 e6 mov %r12,%r14
26: 49 c1 ee 03 shr $0x3,%r14
* 2a: 43 80 3c 3e 00 cmpb $0x0,(%r14,%r15,1) <-- trapping instruction
2f: 74 08 je 0x39
31: 4c 89 e7 mov %r12,%rdi
34: e8 02 c4 eb fd call 0xfdebc43b
39: 4d 8b 3c 24 mov (%r12),%r15
3d: 31 ff xor %edi,%edi
3f: 4c rex.WR
---
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: 6d7e7251d03f Add linux-next specific files for 20251113
git tree: linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=15e4c914580000
kernel config: https://syzkaller.appspot.com/x/.config?x=8a6b17620801a7cb
dashboard link: https://syzkaller.appspot.com/bug?extid=b4c65e7d749285a82467
compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=154ec658580000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=162aeb42580000
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/ab5308631192/disk-6d7e7251.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/53e266b1dfe2/vmlinux-6d7e7251.xz
kernel image: https://storage.googleapis.com/syzbot-assets/a24e6bca1ac0/bzImage-6d7e7251.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+b4c65e...@syzkaller.appspotmail.com
RSP: 002b:00007fff968e5608 EFLAGS: 00000246 ORIG_RAX: 0000000000000110
RAX: ffffffffffffffda RBX: 00007fe58a3e5fa0 RCX: 00007fe58a18f6c9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000000006a040000
RBP: 00007fff968e5660 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 00007fe58a3e5fa0 R14: 00007fe58a3e5fa0 R15: 0000000000000001
</TASK>
Oops: general protection fault, probably for non-canonical address 0xdffffc000000012f: 0000 [#1] SMP KASAN PTI
KASAN: null-ptr-deref in range [0x0000000000000978-0x000000000000097f]
CPU: 1 UID: 0 PID: 6021 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:is_ns_init_id include/linux/ns_common.h:25 [inline]
RIP: 0010:__ns_ref_dec_and_lock include/linux/ns_common.h:108 [inline]
RIP: 0010:put_ipc_ns+0x7f/0x3d0 ipc/namespace.c:204
Code: b8 f1 f1 f1 f1 00 f3 f3 f3 4b 89 44 3d 00 e8 08 6b 85 fd 48 85 db 0f 84 ea 00 00 00 4c 8d a3 88 09 00 00 4d 89 e6 49 c1 ee 03 <43> 80 3c 3e 00 74 08 4c 89 e7 e8 02 c4 eb fd 4d 8b 3c 24 31 ff 4c
RSP: 0018:ffffc900034a7c60 EFLAGS: 00010203
RAX: ffffffff843c7548 RBX: fffffffffffffff4 RCX: ffff88805c080000
RDX: 0000000000000000 RSI: 0000000000000002 RDI: fffffffffffffff4
RBP: ffffc900034a7cf8 R08: ffff8880325cd59f R09: 1ffff110064b9ab3
R10: dffffc0000000000 R11: ffffed10064b9ab4 R12: 000000000000097c
R13: 1ffff92000694f8c R14: 000000000000012f R15: dffffc0000000000
FS: 0000555582176500(0000) GS:ffff888125b78000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000555582176808 CR3: 00000000751d2000 CR4: 00000000003526f0
Call Trace:
<TASK>
nsproxy_free+0x1ef/0x7c0 kernel/nsproxy.c:67
__free_nsproxy_free kernel/nsproxy.c:76 [inline]
create_new_namespaces+0x47a/0x540 kernel/nsproxy.c:132
unshare_nsproxy_namespaces+0x11c/0x170 kernel/nsproxy.c:197
ksys_unshare+0x4c8/0x8c0 kernel/fork.c:3129
__do_sys_unshare kernel/fork.c:3200 [inline]
__se_sys_unshare kernel/fork.c:3198 [inline]
__x64_sys_unshare+0x38/0x50 kernel/fork.c:3198
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fe58a18f6c9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fff968e5608 EFLAGS: 00000246 ORIG_RAX: 0000000000000110
RAX: ffffffffffffffda RBX: 00007fe58a3e5fa0 RCX: 00007fe58a18f6c9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000000006a040000
RBP: 00007fff968e5660 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 00007fe58a3e5fa0 R14: 00007fe58a3e5fa0 R15: 0000000000000001
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:is_ns_init_id include/linux/ns_common.h:25 [inline]
RIP: 0010:__ns_ref_dec_and_lock include/linux/ns_common.h:108 [inline]
RIP: 0010:put_ipc_ns+0x7f/0x3d0 ipc/namespace.c:204
Code: b8 f1 f1 f1 f1 00 f3 f3 f3 4b 89 44 3d 00 e8 08 6b 85 fd 48 85 db 0f 84 ea 00 00 00 4c 8d a3 88 09 00 00 4d 89 e6 49 c1 ee 03 <43> 80 3c 3e 00 74 08 4c 89 e7 e8 02 c4 eb fd 4d 8b 3c 24 31 ff 4c
RSP: 0018:ffffc900034a7c60 EFLAGS: 00010203
RAX: ffffffff843c7548 RBX: fffffffffffffff4 RCX: ffff88805c080000
RDX: 0000000000000000 RSI: 0000000000000002 RDI: fffffffffffffff4
RBP: ffffc900034a7cf8 R08: ffff8880325cd59f R09: 1ffff110064b9ab3
R10: dffffc0000000000 R11: ffffed10064b9ab4 R12: 000000000000097c
R13: 1ffff92000694f8c R14: 000000000000012f R15: dffffc0000000000
FS: 0000555582176500(0000) GS:ffff888125b78000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000555582176808 CR3: 00000000751d2000 CR4: 00000000003526f0
----------------
Code disassembly (best guess):
0: b8 f1 f1 f1 f1 mov $0xf1f1f1f1,%eax
5: 00 f3 add %dh,%bl
7: f3 f3 4b 89 44 3d 00 repz xrelease mov %rax,0x0(%r13,%r15,1)
e: e8 08 6b 85 fd call 0xfd856b1b
13: 48 85 db test %rbx,%rbx
16: 0f 84 ea 00 00 00 je 0x106
1c: 4c 8d a3 88 09 00 00 lea 0x988(%rbx),%r12
23: 4d 89 e6 mov %r12,%r14
26: 49 c1 ee 03 shr $0x3,%r14
* 2a: 43 80 3c 3e 00 cmpb $0x0,(%r14,%r15,1) <-- trapping instruction
2f: 74 08 je 0x39
31: 4c 89 e7 mov %r12,%rdi
34: e8 02 c4 eb fd call 0xfdebc43b
39: 4d 8b 3c 24 mov (%r12),%r15
3d: 31 ff xor %edi,%edi
3f: 4c rex.WR
---
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
Hillf Danton
Nov 17, 2025, 7:21:01 PMNov 17
to syzbot, Christian Brauner, linux-...@vger.kernel.org, linux-...@vger.kernel.org, syzkall...@googlegroups.com
> Date: Mon, 17 Nov 2025 03:17:31 -0800
> Hello,
>
> syzbot found the following issue on:
>
> HEAD commit: 6d7e7251d03f Add linux-next specific files for 20251113
> git tree: linux-next
> console output: https://syzkaller.appspot.com/x/log.txt?x=15e4c914580000
> kernel config: https://syzkaller.appspot.com/x/.config?x=8a6b17620801a7cb
> dashboard link: https://syzkaller.appspot.com/bug?extid=b4c65e7d749285a82467
> compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
> syz repro: https://syzkaller.appspot.com/x/repro.syz?x=154ec658580000
> C reproducer: https://syzkaller.appspot.com/x/repro.c?x=162aeb42580000
#syz test: https://github.com/brauner/linux.git namespace-6.19
>
> syzbot found the following issue on:
>
> HEAD commit: 6d7e7251d03f Add linux-next specific files for 20251113
> git tree: linux-next
> console output: https://syzkaller.appspot.com/x/log.txt?x=15e4c914580000
> kernel config: https://syzkaller.appspot.com/x/.config?x=8a6b17620801a7cb
> dashboard link: https://syzkaller.appspot.com/bug?extid=b4c65e7d749285a82467
> compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
> syz repro: https://syzkaller.appspot.com/x/repro.syz?x=154ec658580000
> C reproducer: https://syzkaller.appspot.com/x/repro.c?x=162aeb42580000
syzbot
Nov 17, 2025, 10:03:05 PMNov 17
to bra...@kernel.org, hda...@sina.com, linux-...@vger.kernel.org, linux-...@vger.kernel.org, syzkall...@googlegroups.com
Hello,
syzbot has tested the proposed patch and the reproducer did not trigger any issue:
Reported-by: syzbot+b4c65e...@syzkaller.appspotmail.com
Tested-by: syzbot+b4c65e...@syzkaller.appspotmail.com
Tested on:
commit: cc7d6c65 nstree: fix kernel-doc comments for internal ..
git tree: https://github.com/brauner/linux.git namespace-6.19
console output: https://syzkaller.appspot.com/x/log.txt?x=10d8e212580000
kernel config: https://syzkaller.appspot.com/x/.config?x=1e17ff55912ea78d
Note: testing is done by a robot and is best-effort only.
syzbot has tested the proposed patch and the reproducer did not trigger any issue:
Reported-by: syzbot+b4c65e...@syzkaller.appspotmail.com
Tested-by: syzbot+b4c65e...@syzkaller.appspotmail.com
Tested on:
commit: cc7d6c65 nstree: fix kernel-doc comments for internal ..
git tree: https://github.com/brauner/linux.git namespace-6.19
console output: https://syzkaller.appspot.com/x/log.txt?x=10d8e212580000
kernel config: https://syzkaller.appspot.com/x/.config?x=1e17ff55912ea78d
dashboard link: https://syzkaller.appspot.com/bug?extid=b4c65e7d749285a82467
compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
Note: no patches were applied.
compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
Note: testing is done by a robot and is best-effort only.
syzbot
Nov 18, 2025, 10:52:20 AMNov 18
to linux-...@vger.kernel.org, syzkall...@googlegroups.com
For archival purposes, forwarding an incoming command email to
linux-...@vger.kernel.org, syzkall...@googlegroups.com.
***
Subject: general protection fault in put_ipc_ns
Author: hellou...@gmail.com
#syz test
linux-...@vger.kernel.org, syzkall...@googlegroups.com.
***
Subject: general protection fault in put_ipc_ns
Author: hellou...@gmail.com
#syz test
syzbot
Nov 18, 2025, 11:44:07 AMNov 18
to hellou...@gmail.com, linux-...@vger.kernel.org, syzkall...@googlegroups.com
Hello,
syzbot tried to test the proposed patch but the build/boot failed:
wner.h:32 [inline]
post_alloc_hook+0x240/0x2a0 mm/page_alloc.c:1851
prep_new_page mm/page_alloc.c:1859 [inline]
get_page_from_freelist+0x2365/0x2440 mm/page_alloc.c:3920
__alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:5215
alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2486
alloc_slab_page mm/slub.c:3075 [inline]
allocate_slab+0x86/0x3b0 mm/slub.c:3248
new_slab mm/slub.c:3302 [inline]
___slab_alloc+0xf56/0x1990 mm/slub.c:4651
__slab_alloc+0x65/0x100 mm/slub.c:4774
__slab_alloc_node mm/slub.c:4850 [inline]
slab_alloc_node mm/slub.c:5246 [inline]
kmem_cache_alloc_node_noprof+0x4ce/0x710 mm/slub.c:5310
__alloc_skb+0x112/0x2d0 net/core/skbuff.c:664
alloc_skb include/linux/skbuff.h:1383 [inline]
alloc_skb_with_frags+0xca/0x890 net/core/skbuff.c:6694
sock_alloc_send_pskb+0x84d/0x980 net/core/sock.c:2995
unix_dgram_sendmsg+0x461/0x1850 net/unix/af_unix.c:2133
sock_sendmsg_nosec net/socket.c:727 [inline]
__sock_sendmsg+0x21c/0x270 net/socket.c:746
sock_write_iter+0x279/0x360 net/socket.c:1199
new_sync_write fs/read_write.c:593 [inline]
vfs_write+0x5c9/0xb30 fs/read_write.c:686
ksys_write+0x145/0x250 fs/read_write.c:738
page last free pid 5214 tgid 5214 stack trace:
reset_page_owner include/linux/page_owner.h:25 [inline]
free_pages_prepare mm/page_alloc.c:1395 [inline]
__free_frozen_pages+0xbc8/0xd30 mm/page_alloc.c:2948
discard_slab mm/slub.c:3346 [inline]
__put_partials+0x146/0x170 mm/slub.c:3886
put_cpu_partial+0x1f2/0x2e0 mm/slub.c:3961
__slab_free+0x288/0x2a0 mm/slub.c:5947
qlink_free mm/kasan/quarantine.c:163 [inline]
qlist_free_all+0x97/0x100 mm/kasan/quarantine.c:179
kasan_quarantine_reduce+0x148/0x160 mm/kasan/quarantine.c:286
__kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:349
kasan_slab_alloc include/linux/kasan.h:252 [inline]
slab_post_alloc_hook mm/slub.c:4948 [inline]
slab_alloc_node mm/slub.c:5258 [inline]
kmem_cache_alloc_noprof+0x37d/0x700 mm/slub.c:5265
getname_flags+0xb8/0x540 fs/namei.c:146
getname include/linux/fs.h:2499 [inline]
__do_sys_unlink fs/namei.c:5443 [inline]
__se_sys_unlink fs/namei.c:5441 [inline]
__x64_sys_unlink+0x3a/0x50 fs/namei.c:5441
ffff888026cc1f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
ffff888026cc1f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff888026cc2000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff888026cc2080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fc fc
ffff888026cc2100: fc fc fc fc fc fc fc fc 00 00 00 00 00 00 00 00
==================================================================
Warning: Permanently added '10.128.1.28' (ED25519) to the list of known hosts.
2025/11/18 16:42:46 parsed 1 programs
[ 77.911157][ T5835] cgroup: Unknown subsys name 'net'
[ 78.100415][ T5835] cgroup: Unknown subsys name 'cpuset'
[ 78.109439][ T5835] cgroup: Unknown subsys name 'rlimit'
Setting up swapspace version 1, size = 127995904 bytes
[ 79.572711][ T5835] Adding 124996k swap on ./swap-file. Priority:0 extents:1 across:124996k
[ 82.581196][ T5849] soft_limit_in_bytes is deprecated and will be removed. Please report your usecase to linu...@kvack.org if you depend on this functionality.
[ 83.370499][ T52] Bluetooth: hci0: unexpected cc 0x0c03 length: 249 > 1
[ 83.379285][ T52] ==================================================================
[ 83.387460][ T52] BUG: KASAN: slab-use-after-free in hci_cmd_work+0x5d0/0x7b0
[ 83.395076][ T52] Read of size 2 at addr ffff888026cc2038 by task kworker/u9:0/52
[ 83.402866][ T52]
[ 83.405398][ T52] CPU: 0 UID: 0 PID: 52 Comm: kworker/u9:0 Not tainted syzkaller #0 PREEMPT(full)
[ 83.405421][ T52] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
[ 83.405433][ T52] Workqueue: hci0 hci_cmd_work
[ 83.405462][ T52] Call Trace:
[ 83.405472][ T52] <TASK>
[ 83.405480][ T52] dump_stack_lvl+0x189/0x250
[ 83.405503][ T52] ? __virt_addr_valid+0x1c8/0x5c0
[ 83.405525][ T52] ? rcu_is_watching+0x15/0xb0
[ 83.405546][ T52] ? __pfx_dump_stack_lvl+0x10/0x10
[ 83.405565][ T52] ? rcu_is_watching+0x15/0xb0
[ 83.405589][ T52] ? lock_release+0x4b/0x3d0
[ 83.405606][ T52] ? _raw_spin_lock_irqsave+0xb3/0xf0
[ 83.405628][ T52] ? __virt_addr_valid+0x1c8/0x5c0
[ 83.405650][ T52] ? __virt_addr_valid+0x4a5/0x5c0
[ 83.405672][ T52] print_report+0xca/0x240
[ 83.405693][ T52] ? hci_cmd_work+0x5d0/0x7b0
[ 83.405708][ T52] kasan_report+0x118/0x150
[ 83.405727][ T52] ? hci_cmd_work+0x5d0/0x7b0
[ 83.405746][ T52] hci_cmd_work+0x5d0/0x7b0
[ 83.405763][ T52] ? process_one_work+0x868/0x15e0
[ 83.405780][ T52] process_one_work+0x93a/0x15e0
[ 83.405796][ T52] ? __lock_acquire+0xab9/0xd20
[ 83.405821][ T52] ? __pfx_process_one_work+0x10/0x10
[ 83.405847][ T52] ? assign_work+0x3a1/0x410
[ 83.405866][ T52] worker_thread+0x9b0/0xee0
[ 83.405894][ T52] kthread+0x711/0x8a0
[ 83.405916][ T52] ? __pfx_worker_thread+0x10/0x10
[ 83.405933][ T52] ? __pfx_kthread+0x10/0x10
[ 83.405954][ T52] ? _raw_spin_unlock_irq+0x23/0x50
[ 83.405974][ T52] ? lockdep_hardirqs_on+0x9c/0x150
[ 83.405994][ T52] ? __pfx_kthread+0x10/0x10
[ 83.406014][ T52] ret_from_fork+0x599/0xb30
[ 83.406031][ T52] ? __pfx_ret_from_fork+0x10/0x10
[ 83.406052][ T52] ? __switch_to_asm+0x39/0x70
[ 83.406071][ T52] ? __switch_to_asm+0x33/0x70
[ 83.406089][ T52] ? __pfx_kthread+0x10/0x10
[ 83.406108][ T52] ret_from_fork_asm+0x1a/0x30
[ 83.406134][ T52] </TASK>
[ 83.406140][ T52]
[ 83.596214][ T52] Allocated by task 5153:
[ 83.600520][ T52] kasan_save_track+0x3e/0x80
[ 83.605447][ T52] __kasan_slab_alloc+0x6c/0x80
[ 83.610281][ T52] kmem_cache_alloc_node_noprof+0x43c/0x710
[ 83.616165][ T52] __alloc_skb+0x112/0x2d0
[ 83.620656][ T52] hci_cmd_sync_alloc+0x3d/0x3b0
[ 83.625587][ T52] __hci_cmd_sync_sk+0x1a7/0xc70
[ 83.630510][ T52] hci_dev_open_sync+0x14b2/0x2dc0
[ 83.635611][ T52] hci_power_on+0x1b4/0x720
[ 83.640096][ T52] process_one_work+0x93a/0x15e0
[ 83.645018][ T52] worker_thread+0x9b0/0xee0
[ 83.649608][ T52] kthread+0x711/0x8a0
[ 83.653664][ T52] ret_from_fork+0x599/0xb30
[ 83.658235][ T52] ret_from_fork_asm+0x1a/0x30
[ 83.662995][ T52]
[ 83.665303][ T52] Freed by task 5872:
[ 83.669262][ T52] kasan_save_track+0x3e/0x80
[ 83.673926][ T52] kasan_save_free_info+0x46/0x50
[ 83.678939][ T52] __kasan_slab_free+0x5c/0x80
[ 83.683696][ T52] kmem_cache_free+0x197/0x640
[ 83.688457][ T52] vhci_read+0x49a/0x5b0
[ 83.692698][ T52] vfs_read+0x200/0xa30
[ 83.696838][ T52] ksys_read+0x145/0x250
[ 83.701073][ T52] do_syscall_64+0xfa/0xfa0
[ 83.705583][ T52] entry_SYSCALL_64_after_hwframe+0x77/0x7f
[ 83.711460][ T52]
[ 83.713772][ T52] The buggy address belongs to the object at ffff888026cc2000
[ 83.713772][ T52] which belongs to the cache skbuff_head_cache of size 240
[ 83.728331][ T52] The buggy address is located 56 bytes inside of
[ 83.728331][ T52] freed 240-byte region [ffff888026cc2000, ffff888026cc20f0)
[ 83.742126][ T52]
[ 83.744521][ T52] The buggy address belongs to the physical page:
[ 83.750927][ T52] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x26cc2
[ 83.759756][ T52] anon flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
[ 83.767296][ T52] page_type: f5(slab)
[ 83.771275][ T52] raw: 00fff00000000000 ffff88801eaa0000 ffffea0000c96dc0 dead000000000005
[ 83.779887][ T52] raw: 0000000000000000 00000000000c000c 00000000f5000000 0000000000000000
[ 83.788446][ T52] page dumped because: kasan: bad access detected
[ 83.794846][ T52] page_owner tracks the page as allocated
[ 83.800544][ T52] page last allocated via order 0, migratetype Unmovable, gfp_mask 0x52cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 5214, tgid 5214 (udevd), ts 26976681464, free_ts 26965856314
[ 83.819365][ T52] post_alloc_hook+0x240/0x2a0
[ 83.824127][ T52] get_page_from_freelist+0x2365/0x2440
[ 83.829660][ T52] __alloc_frozen_pages_noprof+0x181/0x370
[ 83.835551][ T52] alloc_pages_mpol+0x232/0x4a0
[ 83.840387][ T52] allocate_slab+0x86/0x3b0
[ 83.845242][ T52] ___slab_alloc+0xf56/0x1990
[ 83.850075][ T52] __slab_alloc+0x65/0x100
[ 83.854564][ T52] kmem_cache_alloc_node_noprof+0x4ce/0x710
[ 83.860637][ T52] __alloc_skb+0x112/0x2d0
[ 83.865136][ T52] alloc_skb_with_frags+0xca/0x890
[ 83.870326][ T52] sock_alloc_send_pskb+0x84d/0x980
[ 83.875506][ T52] unix_dgram_sendmsg+0x461/0x1850
[ 83.880599][ T52] __sock_sendmsg+0x21c/0x270
[ 83.885356][ T52] sock_write_iter+0x279/0x360
[ 83.890116][ T52] vfs_write+0x5c9/0xb30
[ 83.894341][ T52] ksys_write+0x145/0x250
[ 83.898656][ T52] page last free pid 5214 tgid 5214 stack trace:
[ 83.904967][ T52] __free_frozen_pages+0xbc8/0xd30
[ 83.910059][ T52] __put_partials+0x146/0x170
[ 83.914719][ T52] put_cpu_partial+0x1f2/0x2e0
[ 83.919482][ T52] __slab_free+0x288/0x2a0
[ 83.923881][ T52] qlist_free_all+0x97/0x100
[ 83.928451][ T52] kasan_quarantine_reduce+0x148/0x160
[ 83.933889][ T52] __kasan_slab_alloc+0x22/0x80
[ 83.938724][ T52] kmem_cache_alloc_noprof+0x37d/0x700
[ 83.944169][ T52] getname_flags+0xb8/0x540
[ 83.949091][ T52] __x64_sys_unlink+0x3a/0x50
[ 83.953753][ T52] do_syscall_64+0xfa/0xfa0
[ 83.958248][ T52] entry_SYSCALL_64_after_hwframe+0x77/0x7f
[ 83.964121][ T52]
[ 83.966513][ T52] Memory state around the buggy address:
[ 83.972122][ T52] ffff888026cc1f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 83.980166][ T52] ffff888026cc1f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 83.988209][ T52] >ffff888026cc2000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 83.996247][ T52] ^
[ 84.002117][ T52] ffff888026cc2080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fc fc
[ 84.010260][ T52] ffff888026cc2100: fc fc fc fc fc fc fc fc 00 00 00 00 00 00 00 00
[ 84.018310][ T52] ==================================================================
[ 84.028479][ T52] Kernel panic - not syncing: KASAN: panic_on_warn set ...
[ 84.035707][ T52] CPU: 0 UID: 0 PID: 52 Comm: kworker/u9:0 Not tainted syzkaller #0 PREEMPT(full)
[ 84.045006][ T52] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
[ 84.055073][ T52] Workqueue: hci0 hci_cmd_work
[ 84.059922][ T52] Call Trace:
[ 84.063190][ T52] <TASK>
[ 84.066239][ T52] dump_stack_lvl+0x99/0x250
[ 84.070829][ T52] ? __asan_memcpy+0x40/0x70
[ 84.075506][ T52] ? __pfx_dump_stack_lvl+0x10/0x10
[ 84.080870][ T52] ? __pfx__printk+0x10/0x10
[ 84.085484][ T52] vpanic+0x237/0x6d0
[ 84.089714][ T52] ? __pfx_vpanic+0x10/0x10
[ 84.094201][ T52] ? preempt_schedule+0xae/0xc0
[ 84.099051][ T52] ? __pfx_preempt_schedule+0x10/0x10
[ 84.104414][ T52] panic+0xb9/0xc0
[ 84.108124][ T52] ? __pfx_panic+0x10/0x10
[ 84.112524][ T52] ? _raw_spin_unlock_irqrestore+0xfd/0x110
[ 84.118490][ T52] ? is_module_address+0x17/0xf0
[ 84.123408][ T52] ? hci_cmd_work+0x5d0/0x7b0
[ 84.128066][ T52] check_panic_on_warn+0x89/0xb0
[ 84.132990][ T52] ? hci_cmd_work+0x5d0/0x7b0
[ 84.137758][ T52] end_report+0x6f/0x160
[ 84.142068][ T52] kasan_report+0x129/0x150
[ 84.146646][ T52] ? hci_cmd_work+0x5d0/0x7b0
[ 84.151307][ T52] hci_cmd_work+0x5d0/0x7b0
[ 84.155922][ T52] ? process_one_work+0x868/0x15e0
[ 84.161061][ T52] process_one_work+0x93a/0x15e0
[ 84.165992][ T52] ? __lock_acquire+0xab9/0xd20
[ 84.170840][ T52] ? __pfx_process_one_work+0x10/0x10
[ 84.176283][ T52] ? assign_work+0x3a1/0x410
[ 84.180884][ T52] worker_thread+0x9b0/0xee0
[ 84.185468][ T52] kthread+0x711/0x8a0
[ 84.189525][ T52] ? __pfx_worker_thread+0x10/0x10
[ 84.194622][ T52] ? __pfx_kthread+0x10/0x10
[ 84.199211][ T52] ? _raw_spin_unlock_irq+0x23/0x50
[ 84.204412][ T52] ? lockdep_hardirqs_on+0x9c/0x150
[ 84.209605][ T52] ? __pfx_kthread+0x10/0x10
[ 84.214279][ T52] ret_from_fork+0x599/0xb30
[ 84.218867][ T52] ? __pfx_ret_from_fork+0x10/0x10
[ 84.223975][ T52] ? __switch_to_asm+0x39/0x70
[ 84.228816][ T52] ? __switch_to_asm+0x33/0x70
[ 84.233568][ T52] ? __pfx_kthread+0x10/0x10
[ 84.238153][ T52] ret_from_fork_asm+0x1a/0x30
[ 84.242913][ T52] </TASK>
[ 84.246435][ T52] Kernel Offset: disabled
[ 84.250827][ T52] Rebooting in 86400 seconds..
syzkaller build log:
go env (err=<nil>)
AR='ar'
CC='gcc'
CGO_CFLAGS='-O2 -g'
CGO_CPPFLAGS=''
CGO_CXXFLAGS='-O2 -g'
CGO_ENABLED='1'
CGO_FFLAGS='-O2 -g'
CGO_LDFLAGS='-O2 -g'
CXX='g++'
GCCGO='gccgo'
GO111MODULE='auto'
GOAMD64='v1'
GOARCH='amd64'
GOAUTH='netrc'
GOBIN=''
GOCACHE='/syzkaller/.cache/go-build'
GOCACHEPROG=''
GODEBUG=''
GOENV='/syzkaller/.config/go/env'
GOEXE=''
GOEXPERIMENT=''
GOFIPS140='off'
GOFLAGS=''
GOGCCFLAGS='-fPIC -m64 -pthread -Wl,--no-gc-sections -fmessage-length=0 -ffile-prefix-map=/tmp/go-build3917061150=/tmp/go-build -gno-record-gcc-switches'
GOHOSTARCH='amd64'
GOHOSTOS='linux'
GOINSECURE=''
GOMOD='/syzkaller/jobs-2/linux/gopath/src/github.com/google/syzkaller/go.mod'
GOMODCACHE='/syzkaller/jobs-2/linux/gopath/pkg/mod'
GONOPROXY=''
GONOSUMDB=''
GOOS='linux'
GOPATH='/syzkaller/jobs-2/linux/gopath'
GOPRIVATE=''
GOPROXY='https://proxy.golang.org,direct'
GOROOT='/usr/local/go'
GOSUMDB='sum.golang.org'
GOTELEMETRY='local'
GOTELEMETRYDIR='/syzkaller/.config/go/telemetry'
GOTMPDIR=''
GOTOOLCHAIN='auto'
GOTOOLDIR='/usr/local/go/pkg/tool/linux_amd64'
GOVCS=''
GOVERSION='go1.24.4'
GOWORK=''
PKG_CONFIG='pkg-config'
git status (err=<nil>)
HEAD detached at 07e030dea
nothing to commit, working tree clean
tput: No value for $TERM and no -T specified
tput: No value for $TERM and no -T specified
Makefile:31: run command via tools/syz-env for best compatibility, see:
Makefile:32: https://github.com/google/syzkaller/blob/master/docs/contributing.md#using-syz-env
go list -f '{{.Stale}}' -ldflags="-s -w -X github.com/google/syzkaller/prog.GitRevision=07e030dea6e6d9ca88b75bb3be2810f47083b328 -X github.com/google/syzkaller/prog.gitRevisionDate=20251112-115923" ./sys/syz-sysgen | grep -q false || go install -ldflags="-s -w -X github.com/google/syzkaller/prog.GitRevision=07e030dea6e6d9ca88b75bb3be2810f47083b328 -X github.com/google/syzkaller/prog.gitRevisionDate=20251112-115923" ./sys/syz-sysgen
make .descriptions
tput: No value for $TERM and no -T specified
tput: No value for $TERM and no -T specified
Makefile:31: run command via tools/syz-env for best compatibility, see:
Makefile:32: https://github.com/google/syzkaller/blob/master/docs/contributing.md#using-syz-env
bin/syz-sysgen
touch .descriptions
GOOS=linux GOARCH=amd64 go build -ldflags="-s -w -X github.com/google/syzkaller/prog.GitRevision=07e030dea6e6d9ca88b75bb3be2810f47083b328 -X github.com/google/syzkaller/prog.gitRevisionDate=20251112-115923" -o ./bin/linux_amd64/syz-execprog github.com/google/syzkaller/tools/syz-execprog
mkdir -p ./bin/linux_amd64
g++ -o ./bin/linux_amd64/syz-executor executor/executor.cc \
-m64 -O2 -pthread -Wall -Werror -Wparentheses -Wunused-const-variable -Wframe-larger-than=16384 -Wno-stringop-overflow -Wno-array-bounds -Wno-format-overflow -Wno-unused-but-set-variable -Wno-unused-command-line-argument -static-pie -std=c++17 -I. -Iexecutor/_include -DGOOS_linux=1 -DGOARCH_amd64=1 \
-DHOSTGOOS_linux=1 -DGIT_REVISION=\"07e030dea6e6d9ca88b75bb3be2810f47083b328\"
/usr/bin/ld: /tmp/ccEzlJr7.o: in function `Connection::Connect(char const*, char const*)':
executor.cc:(.text._ZN10Connection7ConnectEPKcS1_[_ZN10Connection7ConnectEPKcS1_]+0x104): warning: Using 'gethostbyname' in statically linked applications requires at runtime the shared libraries from the glibc version used for linking
./tools/check-syzos.sh 2>/dev/null
Error text is too large and was truncated, full error text is at:
https://syzkaller.appspot.com/x/error.txt?x=12a13212580000
Tested on:
commit: 187dac29 Add linux-next specific files for 20251118
git tree: linux-next
kernel config: https://syzkaller.appspot.com/x/.config?x=f3aa05e175a53177
syzbot tried to test the proposed patch but the build/boot failed:
wner.h:32 [inline]
post_alloc_hook+0x240/0x2a0 mm/page_alloc.c:1851
prep_new_page mm/page_alloc.c:1859 [inline]
get_page_from_freelist+0x2365/0x2440 mm/page_alloc.c:3920
__alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:5215
alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2486
alloc_slab_page mm/slub.c:3075 [inline]
allocate_slab+0x86/0x3b0 mm/slub.c:3248
new_slab mm/slub.c:3302 [inline]
___slab_alloc+0xf56/0x1990 mm/slub.c:4651
__slab_alloc+0x65/0x100 mm/slub.c:4774
__slab_alloc_node mm/slub.c:4850 [inline]
slab_alloc_node mm/slub.c:5246 [inline]
kmem_cache_alloc_node_noprof+0x4ce/0x710 mm/slub.c:5310
__alloc_skb+0x112/0x2d0 net/core/skbuff.c:664
alloc_skb include/linux/skbuff.h:1383 [inline]
alloc_skb_with_frags+0xca/0x890 net/core/skbuff.c:6694
sock_alloc_send_pskb+0x84d/0x980 net/core/sock.c:2995
unix_dgram_sendmsg+0x461/0x1850 net/unix/af_unix.c:2133
sock_sendmsg_nosec net/socket.c:727 [inline]
__sock_sendmsg+0x21c/0x270 net/socket.c:746
sock_write_iter+0x279/0x360 net/socket.c:1199
new_sync_write fs/read_write.c:593 [inline]
vfs_write+0x5c9/0xb30 fs/read_write.c:686
ksys_write+0x145/0x250 fs/read_write.c:738
page last free pid 5214 tgid 5214 stack trace:
reset_page_owner include/linux/page_owner.h:25 [inline]
free_pages_prepare mm/page_alloc.c:1395 [inline]
__free_frozen_pages+0xbc8/0xd30 mm/page_alloc.c:2948
discard_slab mm/slub.c:3346 [inline]
__put_partials+0x146/0x170 mm/slub.c:3886
put_cpu_partial+0x1f2/0x2e0 mm/slub.c:3961
__slab_free+0x288/0x2a0 mm/slub.c:5947
qlink_free mm/kasan/quarantine.c:163 [inline]
qlist_free_all+0x97/0x100 mm/kasan/quarantine.c:179
kasan_quarantine_reduce+0x148/0x160 mm/kasan/quarantine.c:286
__kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:349
kasan_slab_alloc include/linux/kasan.h:252 [inline]
slab_post_alloc_hook mm/slub.c:4948 [inline]
slab_alloc_node mm/slub.c:5258 [inline]
kmem_cache_alloc_noprof+0x37d/0x700 mm/slub.c:5265
getname_flags+0xb8/0x540 fs/namei.c:146
getname include/linux/fs.h:2499 [inline]
__do_sys_unlink fs/namei.c:5443 [inline]
__se_sys_unlink fs/namei.c:5441 [inline]
__x64_sys_unlink+0x3a/0x50 fs/namei.c:5441
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Memory state around the buggy address:
do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
ffff888026cc1f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
ffff888026cc1f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff888026cc2000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff888026cc2080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fc fc
ffff888026cc2100: fc fc fc fc fc fc fc fc 00 00 00 00 00 00 00 00
==================================================================
Warning: Permanently added '10.128.1.28' (ED25519) to the list of known hosts.
2025/11/18 16:42:46 parsed 1 programs
[ 77.911157][ T5835] cgroup: Unknown subsys name 'net'
[ 78.100415][ T5835] cgroup: Unknown subsys name 'cpuset'
[ 78.109439][ T5835] cgroup: Unknown subsys name 'rlimit'
Setting up swapspace version 1, size = 127995904 bytes
[ 79.572711][ T5835] Adding 124996k swap on ./swap-file. Priority:0 extents:1 across:124996k
[ 82.581196][ T5849] soft_limit_in_bytes is deprecated and will be removed. Please report your usecase to linu...@kvack.org if you depend on this functionality.
[ 83.370499][ T52] Bluetooth: hci0: unexpected cc 0x0c03 length: 249 > 1
[ 83.379285][ T52] ==================================================================
[ 83.387460][ T52] BUG: KASAN: slab-use-after-free in hci_cmd_work+0x5d0/0x7b0
[ 83.395076][ T52] Read of size 2 at addr ffff888026cc2038 by task kworker/u9:0/52
[ 83.402866][ T52]
[ 83.405398][ T52] CPU: 0 UID: 0 PID: 52 Comm: kworker/u9:0 Not tainted syzkaller #0 PREEMPT(full)
[ 83.405421][ T52] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
[ 83.405433][ T52] Workqueue: hci0 hci_cmd_work
[ 83.405462][ T52] Call Trace:
[ 83.405472][ T52] <TASK>
[ 83.405480][ T52] dump_stack_lvl+0x189/0x250
[ 83.405503][ T52] ? __virt_addr_valid+0x1c8/0x5c0
[ 83.405525][ T52] ? rcu_is_watching+0x15/0xb0
[ 83.405546][ T52] ? __pfx_dump_stack_lvl+0x10/0x10
[ 83.405565][ T52] ? rcu_is_watching+0x15/0xb0
[ 83.405589][ T52] ? lock_release+0x4b/0x3d0
[ 83.405606][ T52] ? _raw_spin_lock_irqsave+0xb3/0xf0
[ 83.405628][ T52] ? __virt_addr_valid+0x1c8/0x5c0
[ 83.405650][ T52] ? __virt_addr_valid+0x4a5/0x5c0
[ 83.405672][ T52] print_report+0xca/0x240
[ 83.405693][ T52] ? hci_cmd_work+0x5d0/0x7b0
[ 83.405708][ T52] kasan_report+0x118/0x150
[ 83.405727][ T52] ? hci_cmd_work+0x5d0/0x7b0
[ 83.405746][ T52] hci_cmd_work+0x5d0/0x7b0
[ 83.405763][ T52] ? process_one_work+0x868/0x15e0
[ 83.405780][ T52] process_one_work+0x93a/0x15e0
[ 83.405796][ T52] ? __lock_acquire+0xab9/0xd20
[ 83.405821][ T52] ? __pfx_process_one_work+0x10/0x10
[ 83.405847][ T52] ? assign_work+0x3a1/0x410
[ 83.405866][ T52] worker_thread+0x9b0/0xee0
[ 83.405894][ T52] kthread+0x711/0x8a0
[ 83.405916][ T52] ? __pfx_worker_thread+0x10/0x10
[ 83.405933][ T52] ? __pfx_kthread+0x10/0x10
[ 83.405954][ T52] ? _raw_spin_unlock_irq+0x23/0x50
[ 83.405974][ T52] ? lockdep_hardirqs_on+0x9c/0x150
[ 83.405994][ T52] ? __pfx_kthread+0x10/0x10
[ 83.406014][ T52] ret_from_fork+0x599/0xb30
[ 83.406031][ T52] ? __pfx_ret_from_fork+0x10/0x10
[ 83.406052][ T52] ? __switch_to_asm+0x39/0x70
[ 83.406071][ T52] ? __switch_to_asm+0x33/0x70
[ 83.406089][ T52] ? __pfx_kthread+0x10/0x10
[ 83.406108][ T52] ret_from_fork_asm+0x1a/0x30
[ 83.406134][ T52] </TASK>
[ 83.406140][ T52]
[ 83.596214][ T52] Allocated by task 5153:
[ 83.600520][ T52] kasan_save_track+0x3e/0x80
[ 83.605447][ T52] __kasan_slab_alloc+0x6c/0x80
[ 83.610281][ T52] kmem_cache_alloc_node_noprof+0x43c/0x710
[ 83.616165][ T52] __alloc_skb+0x112/0x2d0
[ 83.620656][ T52] hci_cmd_sync_alloc+0x3d/0x3b0
[ 83.625587][ T52] __hci_cmd_sync_sk+0x1a7/0xc70
[ 83.630510][ T52] hci_dev_open_sync+0x14b2/0x2dc0
[ 83.635611][ T52] hci_power_on+0x1b4/0x720
[ 83.640096][ T52] process_one_work+0x93a/0x15e0
[ 83.645018][ T52] worker_thread+0x9b0/0xee0
[ 83.649608][ T52] kthread+0x711/0x8a0
[ 83.653664][ T52] ret_from_fork+0x599/0xb30
[ 83.658235][ T52] ret_from_fork_asm+0x1a/0x30
[ 83.662995][ T52]
[ 83.665303][ T52] Freed by task 5872:
[ 83.669262][ T52] kasan_save_track+0x3e/0x80
[ 83.673926][ T52] kasan_save_free_info+0x46/0x50
[ 83.678939][ T52] __kasan_slab_free+0x5c/0x80
[ 83.683696][ T52] kmem_cache_free+0x197/0x640
[ 83.688457][ T52] vhci_read+0x49a/0x5b0
[ 83.692698][ T52] vfs_read+0x200/0xa30
[ 83.696838][ T52] ksys_read+0x145/0x250
[ 83.701073][ T52] do_syscall_64+0xfa/0xfa0
[ 83.705583][ T52] entry_SYSCALL_64_after_hwframe+0x77/0x7f
[ 83.711460][ T52]
[ 83.713772][ T52] The buggy address belongs to the object at ffff888026cc2000
[ 83.713772][ T52] which belongs to the cache skbuff_head_cache of size 240
[ 83.728331][ T52] The buggy address is located 56 bytes inside of
[ 83.728331][ T52] freed 240-byte region [ffff888026cc2000, ffff888026cc20f0)
[ 83.742126][ T52]
[ 83.744521][ T52] The buggy address belongs to the physical page:
[ 83.750927][ T52] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x26cc2
[ 83.759756][ T52] anon flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
[ 83.767296][ T52] page_type: f5(slab)
[ 83.771275][ T52] raw: 00fff00000000000 ffff88801eaa0000 ffffea0000c96dc0 dead000000000005
[ 83.779887][ T52] raw: 0000000000000000 00000000000c000c 00000000f5000000 0000000000000000
[ 83.788446][ T52] page dumped because: kasan: bad access detected
[ 83.794846][ T52] page_owner tracks the page as allocated
[ 83.800544][ T52] page last allocated via order 0, migratetype Unmovable, gfp_mask 0x52cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 5214, tgid 5214 (udevd), ts 26976681464, free_ts 26965856314
[ 83.819365][ T52] post_alloc_hook+0x240/0x2a0
[ 83.824127][ T52] get_page_from_freelist+0x2365/0x2440
[ 83.829660][ T52] __alloc_frozen_pages_noprof+0x181/0x370
[ 83.835551][ T52] alloc_pages_mpol+0x232/0x4a0
[ 83.840387][ T52] allocate_slab+0x86/0x3b0
[ 83.845242][ T52] ___slab_alloc+0xf56/0x1990
[ 83.850075][ T52] __slab_alloc+0x65/0x100
[ 83.854564][ T52] kmem_cache_alloc_node_noprof+0x4ce/0x710
[ 83.860637][ T52] __alloc_skb+0x112/0x2d0
[ 83.865136][ T52] alloc_skb_with_frags+0xca/0x890
[ 83.870326][ T52] sock_alloc_send_pskb+0x84d/0x980
[ 83.875506][ T52] unix_dgram_sendmsg+0x461/0x1850
[ 83.880599][ T52] __sock_sendmsg+0x21c/0x270
[ 83.885356][ T52] sock_write_iter+0x279/0x360
[ 83.890116][ T52] vfs_write+0x5c9/0xb30
[ 83.894341][ T52] ksys_write+0x145/0x250
[ 83.898656][ T52] page last free pid 5214 tgid 5214 stack trace:
[ 83.904967][ T52] __free_frozen_pages+0xbc8/0xd30
[ 83.910059][ T52] __put_partials+0x146/0x170
[ 83.914719][ T52] put_cpu_partial+0x1f2/0x2e0
[ 83.919482][ T52] __slab_free+0x288/0x2a0
[ 83.923881][ T52] qlist_free_all+0x97/0x100
[ 83.928451][ T52] kasan_quarantine_reduce+0x148/0x160
[ 83.933889][ T52] __kasan_slab_alloc+0x22/0x80
[ 83.938724][ T52] kmem_cache_alloc_noprof+0x37d/0x700
[ 83.944169][ T52] getname_flags+0xb8/0x540
[ 83.949091][ T52] __x64_sys_unlink+0x3a/0x50
[ 83.953753][ T52] do_syscall_64+0xfa/0xfa0
[ 83.958248][ T52] entry_SYSCALL_64_after_hwframe+0x77/0x7f
[ 83.964121][ T52]
[ 83.966513][ T52] Memory state around the buggy address:
[ 83.972122][ T52] ffff888026cc1f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 83.980166][ T52] ffff888026cc1f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 83.988209][ T52] >ffff888026cc2000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 83.996247][ T52] ^
[ 84.002117][ T52] ffff888026cc2080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fc fc
[ 84.010260][ T52] ffff888026cc2100: fc fc fc fc fc fc fc fc 00 00 00 00 00 00 00 00
[ 84.018310][ T52] ==================================================================
[ 84.028479][ T52] Kernel panic - not syncing: KASAN: panic_on_warn set ...
[ 84.035707][ T52] CPU: 0 UID: 0 PID: 52 Comm: kworker/u9:0 Not tainted syzkaller #0 PREEMPT(full)
[ 84.045006][ T52] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
[ 84.055073][ T52] Workqueue: hci0 hci_cmd_work
[ 84.059922][ T52] Call Trace:
[ 84.063190][ T52] <TASK>
[ 84.066239][ T52] dump_stack_lvl+0x99/0x250
[ 84.070829][ T52] ? __asan_memcpy+0x40/0x70
[ 84.075506][ T52] ? __pfx_dump_stack_lvl+0x10/0x10
[ 84.080870][ T52] ? __pfx__printk+0x10/0x10
[ 84.085484][ T52] vpanic+0x237/0x6d0
[ 84.089714][ T52] ? __pfx_vpanic+0x10/0x10
[ 84.094201][ T52] ? preempt_schedule+0xae/0xc0
[ 84.099051][ T52] ? __pfx_preempt_schedule+0x10/0x10
[ 84.104414][ T52] panic+0xb9/0xc0
[ 84.108124][ T52] ? __pfx_panic+0x10/0x10
[ 84.112524][ T52] ? _raw_spin_unlock_irqrestore+0xfd/0x110
[ 84.118490][ T52] ? is_module_address+0x17/0xf0
[ 84.123408][ T52] ? hci_cmd_work+0x5d0/0x7b0
[ 84.128066][ T52] check_panic_on_warn+0x89/0xb0
[ 84.132990][ T52] ? hci_cmd_work+0x5d0/0x7b0
[ 84.137758][ T52] end_report+0x6f/0x160
[ 84.142068][ T52] kasan_report+0x129/0x150
[ 84.146646][ T52] ? hci_cmd_work+0x5d0/0x7b0
[ 84.151307][ T52] hci_cmd_work+0x5d0/0x7b0
[ 84.155922][ T52] ? process_one_work+0x868/0x15e0
[ 84.161061][ T52] process_one_work+0x93a/0x15e0
[ 84.165992][ T52] ? __lock_acquire+0xab9/0xd20
[ 84.170840][ T52] ? __pfx_process_one_work+0x10/0x10
[ 84.176283][ T52] ? assign_work+0x3a1/0x410
[ 84.180884][ T52] worker_thread+0x9b0/0xee0
[ 84.185468][ T52] kthread+0x711/0x8a0
[ 84.189525][ T52] ? __pfx_worker_thread+0x10/0x10
[ 84.194622][ T52] ? __pfx_kthread+0x10/0x10
[ 84.199211][ T52] ? _raw_spin_unlock_irq+0x23/0x50
[ 84.204412][ T52] ? lockdep_hardirqs_on+0x9c/0x150
[ 84.209605][ T52] ? __pfx_kthread+0x10/0x10
[ 84.214279][ T52] ret_from_fork+0x599/0xb30
[ 84.218867][ T52] ? __pfx_ret_from_fork+0x10/0x10
[ 84.223975][ T52] ? __switch_to_asm+0x39/0x70
[ 84.228816][ T52] ? __switch_to_asm+0x33/0x70
[ 84.233568][ T52] ? __pfx_kthread+0x10/0x10
[ 84.238153][ T52] ret_from_fork_asm+0x1a/0x30
[ 84.242913][ T52] </TASK>
[ 84.246435][ T52] Kernel Offset: disabled
[ 84.250827][ T52] Rebooting in 86400 seconds..
syzkaller build log:
go env (err=<nil>)
AR='ar'
CC='gcc'
CGO_CFLAGS='-O2 -g'
CGO_CPPFLAGS=''
CGO_CXXFLAGS='-O2 -g'
CGO_ENABLED='1'
CGO_FFLAGS='-O2 -g'
CGO_LDFLAGS='-O2 -g'
CXX='g++'
GCCGO='gccgo'
GO111MODULE='auto'
GOAMD64='v1'
GOARCH='amd64'
GOAUTH='netrc'
GOBIN=''
GOCACHE='/syzkaller/.cache/go-build'
GOCACHEPROG=''
GODEBUG=''
GOENV='/syzkaller/.config/go/env'
GOEXE=''
GOEXPERIMENT=''
GOFIPS140='off'
GOFLAGS=''
GOGCCFLAGS='-fPIC -m64 -pthread -Wl,--no-gc-sections -fmessage-length=0 -ffile-prefix-map=/tmp/go-build3917061150=/tmp/go-build -gno-record-gcc-switches'
GOHOSTARCH='amd64'
GOHOSTOS='linux'
GOINSECURE=''
GOMOD='/syzkaller/jobs-2/linux/gopath/src/github.com/google/syzkaller/go.mod'
GOMODCACHE='/syzkaller/jobs-2/linux/gopath/pkg/mod'
GONOPROXY=''
GONOSUMDB=''
GOOS='linux'
GOPATH='/syzkaller/jobs-2/linux/gopath'
GOPRIVATE=''
GOPROXY='https://proxy.golang.org,direct'
GOROOT='/usr/local/go'
GOSUMDB='sum.golang.org'
GOTELEMETRY='local'
GOTELEMETRYDIR='/syzkaller/.config/go/telemetry'
GOTMPDIR=''
GOTOOLCHAIN='auto'
GOTOOLDIR='/usr/local/go/pkg/tool/linux_amd64'
GOVCS=''
GOVERSION='go1.24.4'
GOWORK=''
PKG_CONFIG='pkg-config'
git status (err=<nil>)
HEAD detached at 07e030dea
nothing to commit, working tree clean
tput: No value for $TERM and no -T specified
tput: No value for $TERM and no -T specified
Makefile:31: run command via tools/syz-env for best compatibility, see:
Makefile:32: https://github.com/google/syzkaller/blob/master/docs/contributing.md#using-syz-env
go list -f '{{.Stale}}' -ldflags="-s -w -X github.com/google/syzkaller/prog.GitRevision=07e030dea6e6d9ca88b75bb3be2810f47083b328 -X github.com/google/syzkaller/prog.gitRevisionDate=20251112-115923" ./sys/syz-sysgen | grep -q false || go install -ldflags="-s -w -X github.com/google/syzkaller/prog.GitRevision=07e030dea6e6d9ca88b75bb3be2810f47083b328 -X github.com/google/syzkaller/prog.gitRevisionDate=20251112-115923" ./sys/syz-sysgen
make .descriptions
tput: No value for $TERM and no -T specified
tput: No value for $TERM and no -T specified
Makefile:31: run command via tools/syz-env for best compatibility, see:
Makefile:32: https://github.com/google/syzkaller/blob/master/docs/contributing.md#using-syz-env
bin/syz-sysgen
touch .descriptions
GOOS=linux GOARCH=amd64 go build -ldflags="-s -w -X github.com/google/syzkaller/prog.GitRevision=07e030dea6e6d9ca88b75bb3be2810f47083b328 -X github.com/google/syzkaller/prog.gitRevisionDate=20251112-115923" -o ./bin/linux_amd64/syz-execprog github.com/google/syzkaller/tools/syz-execprog
mkdir -p ./bin/linux_amd64
g++ -o ./bin/linux_amd64/syz-executor executor/executor.cc \
-m64 -O2 -pthread -Wall -Werror -Wparentheses -Wunused-const-variable -Wframe-larger-than=16384 -Wno-stringop-overflow -Wno-array-bounds -Wno-format-overflow -Wno-unused-but-set-variable -Wno-unused-command-line-argument -static-pie -std=c++17 -I. -Iexecutor/_include -DGOOS_linux=1 -DGOARCH_amd64=1 \
-DHOSTGOOS_linux=1 -DGIT_REVISION=\"07e030dea6e6d9ca88b75bb3be2810f47083b328\"
/usr/bin/ld: /tmp/ccEzlJr7.o: in function `Connection::Connect(char const*, char const*)':
executor.cc:(.text._ZN10Connection7ConnectEPKcS1_[_ZN10Connection7ConnectEPKcS1_]+0x104): warning: Using 'gethostbyname' in statically linked applications requires at runtime the shared libraries from the glibc version used for linking
./tools/check-syzos.sh 2>/dev/null
Error text is too large and was truncated, full error text is at:
https://syzkaller.appspot.com/x/error.txt?x=12a13212580000
Tested on:
commit: 187dac29 Add linux-next specific files for 20251118
git tree: linux-next
kernel config: https://syzkaller.appspot.com/x/.config?x=f3aa05e175a53177
dashboard link: https://syzkaller.appspot.com/bug?extid=b4c65e7d749285a82467
compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
patch: https://syzkaller.appspot.com/x/patch.diff?x=1345fb42580000
compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
syzbot
Nov 18, 2025, 12:13:03 PMNov 18
to linux-...@vger.kernel.org, syzkall...@googlegroups.com
For archival purposes, forwarding an incoming command email to
linux-...@vger.kernel.org, syzkall...@googlegroups.com.
***
Subject: [syzbot] [kernel?] general protection fault in put_ipc_ns
linux-...@vger.kernel.org, syzkall...@googlegroups.com.
***
Author: hellou...@gmail.com
#syz test
diff --git a/ipc/namespace.c b/ipc/namespace.c
index 535f16e..ea3015c 100644
--- a/ipc/namespace.c
+++ b/ipc/namespace.c
@@ -201,7 +201,7 @@ static void free_ipc(struct work_struct *unused)
*/
void put_ipc_ns(struct ipc_namespace *ns)
{
- if (ns_ref_put_and_lock(ns, &mq_lock)) {
+ if (ns != NULL && ns_ref_put_and_lock(ns, &mq_lock)) {
mq_clear_sbinfo(ns);
spin_unlock(&mq_lock);
syzbot
Nov 18, 2025, 3:02:04 PMNov 18
to hellou...@gmail.com, linux-...@vger.kernel.org, syzkall...@googlegroups.com
Hello,
syzbot tried to test the proposed patch but the build/boot failed:
adv_slave_0
syzbot tried to test the proposed patch but the build/boot failed:
[ 82.746048][ T5860] batman_adv: batadv0: The MTU of interface batadv_slave_0 is too small (1500) to handle the transport of batman-adv packets. Packets going over this interface will be fragmented on layer2 which could impact the performance. Setting the MTU to 1532 would solve the problem.
[ 82.773161][ T5860] batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active
[ 82.785953][ T5860] batman_adv: batadv0: Adding interface: batadv_slave_1
[ 82.794164][ T5860] batman_adv: batadv0: The MTU of interface batadv_slave_1 is too small (1500) to handle the transport of batman-adv packets. Packets going over this interface will be fragmented on layer2 which could impact the performance. Setting the MTU to 1532 would solve the problem.
[ 82.820942][ T5860] batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active
[ 82.862768][ T5860] hsr_slave_0: entered promiscuous mode
[ 82.869651][ T5860] hsr_slave_1: entered promiscuous mode
[ 83.005933][ T5860] netdevsim netdevsim0 netdevsim0: renamed from eth0
[ 83.019731][ T5860] netdevsim netdevsim0 netdevsim1: renamed from eth1
[ 83.030171][ T5860] netdevsim netdevsim0 netdevsim2: renamed from eth2
[ 83.040986][ T5860] netdevsim netdevsim0 netdevsim3: renamed from eth3
[ 83.071236][ T5860] bridge0: port 2(bridge_slave_1) entered blocking state
[ 83.078685][ T5860] bridge0: port 2(bridge_slave_1) entered forwarding state
[ 83.086669][ T5860] bridge0: port 1(bridge_slave_0) entered blocking state
[ 83.093877][ T5860] bridge0: port 1(bridge_slave_0) entered forwarding state
[ 83.151826][ T5860] 8021q: adding VLAN 0 to HW filter on device bond0
[ 83.171295][ T13] bridge0: port 1(bridge_slave_0) entered disabled state
[ 83.180117][ T13] bridge0: port 2(bridge_slave_1) entered disabled state
[ 83.196524][ T5860] 8021q: adding VLAN 0 to HW filter on device team0
[ 83.211219][ T3472] bridge0: port 1(bridge_slave_0) entered blocking state
[ 83.218434][ T3472] bridge0: port 1(bridge_slave_0) entered forwarding state
[ 83.234149][ T3472] bridge0: port 2(bridge_slave_1) entered blocking state
[ 83.241297][ T3472] bridge0: port 2(bridge_slave_1) entered forwarding state
[ 83.404613][ T5860] 8021q: adding VLAN 0 to HW filter on device batadv0
[ 83.449917][ T5860] veth0_vlan: entered promiscuous mode
[ 83.462775][ T5860] veth1_vlan: entered promiscuous mode
[ 83.492993][ T5860] veth0_macvtap: entered promiscuous mode
[ 83.503348][ T5860] veth1_macvtap: entered promiscuous mode
[ 83.523457][ T5860] batman_adv: batadv0: Interface activated: batadv_slave_0
[ 83.537529][ T5860] batman_adv: batadv0: Interface activated: batadv_slave_1
[ 83.554721][ T13] netdevsim netdevsim0 netdevsim0: set [1, 0] type 2 family 0 port 6081 - 0
[ 83.566197][ T13] netdevsim netdevsim0 netdevsim1: set [1, 0] type 2 family 0 port 6081 - 0
[ 83.575668][ T13] netdevsim netdevsim0 netdevsim2: set [1, 0] type 2 family 0 port 6081 - 0
[ 83.586196][ T13] netdevsim netdevsim0 netdevsim3: set [1, 0] type 2 family 0 port 6081 - 0
[ 83.724406][ T13] netdevsim netdevsim0 netdevsim3 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0
[ 83.805326][ T13] netdevsim netdevsim0 netdevsim2 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0
[ 83.870907][ T13] netdevsim netdevsim0 netdevsim1 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0
[ 83.935311][ T5149] Bluetooth: hci0: unexpected cc 0x0c03 length: 249 > 1
[ 83.945133][ T5149] Bluetooth: hci0: unexpected cc 0x1003 length: 249 > 9
[ 83.954176][ T5149] Bluetooth: hci0: unexpected cc 0x1001 length: 249 > 9
[ 83.962161][ T5149] ==================================================================
[ 83.970240][ T5149] BUG: KASAN: slab-use-after-free in hci_cmd_work+0x5d0/0x7b0
[ 83.977772][ T5149] Read of size 2 at addr ffff88807912b178 by task kworker/u9:1/5149
[ 83.985826][ T5149]
[ 83.988159][ T5149] CPU: 1 UID: 0 PID: 5149 Comm: kworker/u9:1 Not tainted syzkaller #0 PREEMPT(full)
[ 83.988173][ T5149] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
[ 83.988181][ T5149] Workqueue: hci0 hci_cmd_work
[ 83.988200][ T5149] Call Trace:
[ 83.988208][ T5149] <TASK>
[ 83.988212][ T5149] dump_stack_lvl+0x189/0x250
[ 83.988226][ T5149] ? __virt_addr_valid+0x1c8/0x5c0
[ 83.988242][ T5149] ? rcu_is_watching+0x15/0xb0
[ 83.988261][ T5149] ? __pfx_dump_stack_lvl+0x10/0x10
[ 83.988277][ T5149] ? rcu_is_watching+0x15/0xb0
[ 83.988294][ T5149] ? lock_release+0x4b/0x3d0
[ 83.988309][ T5149] ? _raw_spin_lock_irqsave+0xb3/0xf0
[ 83.988328][ T5149] ? __virt_addr_valid+0x1c8/0x5c0
[ 83.988348][ T5149] ? __virt_addr_valid+0x4a5/0x5c0
[ 83.988368][ T5149] print_report+0xca/0x240
[ 83.988388][ T5149] ? hci_cmd_work+0x5d0/0x7b0
[ 83.988402][ T5149] kasan_report+0x118/0x150
[ 83.988420][ T5149] ? hci_cmd_work+0x5d0/0x7b0
[ 83.988439][ T5149] hci_cmd_work+0x5d0/0x7b0
[ 83.988454][ T5149] ? process_one_work+0x868/0x15e0
[ 83.988471][ T5149] process_one_work+0x93a/0x15e0
[ 83.988487][ T5149] ? __lock_acquire+0xab9/0xd20
[ 83.988510][ T5149] ? __pfx_process_one_work+0x10/0x10
[ 83.988528][ T5149] ? assign_work+0x3a1/0x410
[ 83.988544][ T5149] worker_thread+0x9b0/0xee0
[ 83.988569][ T5149] kthread+0x711/0x8a0
[ 83.988589][ T5149] ? __pfx_worker_thread+0x10/0x10
[ 83.988605][ T5149] ? __pfx_kthread+0x10/0x10
[ 83.988625][ T5149] ? _raw_spin_unlock_irq+0x23/0x50
[ 83.988642][ T5149] ? lockdep_hardirqs_on+0x9c/0x150
[ 83.988663][ T5149] ? __pfx_kthread+0x10/0x10
[ 83.988682][ T5149] ret_from_fork+0x599/0xb30
[ 83.988699][ T5149] ? __pfx_ret_from_fork+0x10/0x10
[ 83.988717][ T5149] ? __switch_to_asm+0x39/0x70
[ 83.988735][ T5149] ? __switch_to_asm+0x33/0x70
[ 83.988753][ T5149] ? __pfx_kthread+0x10/0x10
[ 83.988770][ T5149] ret_from_fork_asm+0x1a/0x30
[ 83.988794][ T5149] </TASK>
[ 83.988800][ T5149]
[ 84.178661][ T5149] Allocated by task 51:
[ 84.182802][ T5149] kasan_save_track+0x3e/0x80
[ 84.187470][ T5149] __kasan_slab_alloc+0x6c/0x80
[ 84.192305][ T5149] kmem_cache_alloc_node_noprof+0x43c/0x710
[ 84.198202][ T5149] __alloc_skb+0x112/0x2d0
[ 84.202607][ T5149] hci_cmd_sync_alloc+0x3d/0x3b0
[ 84.207729][ T5149] __hci_cmd_sync_sk+0x1a7/0xc70
[ 84.212679][ T5149] hci_dev_open_sync+0x1756/0x2dc0
[ 84.217791][ T5149] hci_power_on+0x1b4/0x720
[ 84.222285][ T5149] process_one_work+0x93a/0x15e0
[ 84.227216][ T5149] worker_thread+0x9b0/0xee0
[ 84.231822][ T5149] kthread+0x711/0x8a0
[ 84.235883][ T5149] ret_from_fork+0x599/0xb30
[ 84.240457][ T5149] ret_from_fork_asm+0x1a/0x30
[ 84.245211][ T5149]
[ 84.247532][ T5149] Freed by task 5891:
[ 84.251512][ T5149] kasan_save_track+0x3e/0x80
[ 84.256186][ T5149] kasan_save_free_info+0x46/0x50
[ 84.261299][ T5149] __kasan_slab_free+0x5c/0x80
[ 84.266105][ T5149] kmem_cache_free+0x197/0x640
[ 84.270862][ T5149] vhci_read+0x49a/0x5b0
[ 84.275105][ T5149] vfs_read+0x200/0xa30
[ 84.279274][ T5149] ksys_read+0x145/0x250
[ 84.283498][ T5149] do_syscall_64+0xfa/0xfa0
[ 84.287991][ T5149] entry_SYSCALL_64_after_hwframe+0x77/0x7f
[ 84.293891][ T5149]
[ 84.296210][ T5149] The buggy address belongs to the object at ffff88807912b140
[ 84.296210][ T5149] which belongs to the cache skbuff_head_cache of size 240
[ 84.310805][ T5149] The buggy address is located 56 bytes inside of
[ 84.310805][ T5149] freed 240-byte region [ffff88807912b140, ffff88807912b230)
[ 84.324512][ T5149]
[ 84.326836][ T5149] The buggy address belongs to the physical page:
[ 84.333246][ T5149] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7912b
[ 84.341996][ T5149] flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
[ 84.349273][ T5149] page_type: f5(slab)
[ 84.353249][ T5149] raw: 00fff00000000000 ffff8881416a7000 dead000000000122 0000000000000000
[ 84.361818][ T5149] raw: 0000000000000000 00000000800c000c 00000000f5000000 0000000000000000
[ 84.370380][ T5149] page dumped because: kasan: bad access detected
[ 84.376783][ T5149] page_owner tracks the page as allocated
[ 84.382566][ T5149] page last allocated via order 0, migratetype Unmovable, gfp_mask 0x52cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 5149, tgid 5149 (kworker/u9:1), ts 83954148103, free_ts 83898959204
[ 84.401827][ T5149] post_alloc_hook+0x240/0x2a0
[ 84.406596][ T5149] get_page_from_freelist+0x2365/0x2440
[ 84.412140][ T5149] __alloc_frozen_pages_noprof+0x181/0x370
[ 84.417940][ T5149] alloc_pages_mpol+0x232/0x4a0
[ 84.422780][ T5149] allocate_slab+0x86/0x3b0
[ 84.427274][ T5149] ___slab_alloc+0xf56/0x1990
[ 84.431938][ T5149] __slab_alloc+0x65/0x100
[ 84.436343][ T5149] kmem_cache_alloc_noprof+0x40f/0x700
[ 84.441793][ T5149] skb_clone+0x212/0x3a0
[ 84.446024][ T5149] hci_event_packet+0x3f4/0x1260
[ 84.450947][ T5149] hci_rx_work+0x45d/0xfc0
[ 84.455353][ T5149] process_one_work+0x93a/0x15e0
[ 84.460293][ T5149] worker_thread+0x9b0/0xee0
[ 84.464934][ T5149] kthread+0x711/0x8a0
[ 84.468988][ T5149] ret_from_fork+0x599/0xb30
[ 84.473570][ T5149] ret_from_fork_asm+0x1a/0x30
[ 84.478320][ T5149] page last free pid 23 tgid 23 stack trace:
[ 84.484280][ T5149] __free_frozen_pages+0xbc8/0xd30
[ 84.489382][ T5149] rcu_core+0xcab/0x1770
[ 84.493645][ T5149] handle_softirqs+0x27d/0x880
[ 84.498484][ T5149] run_ksoftirqd+0x9b/0x100
[ 84.502973][ T5149] smpboot_thread_fn+0x542/0xa60
[ 84.507903][ T5149] kthread+0x711/0x8a0
[ 84.511955][ T5149] ret_from_fork+0x599/0xb30
[ 84.516613][ T5149] ret_from_fork_asm+0x1a/0x30
[ 84.521371][ T5149]
[ 84.523692][ T5149] Memory state around the buggy address:
[ 84.529318][ T5149] ffff88807912b000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 84.537367][ T5149] ffff88807912b080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fc fc
[ 84.545411][ T5149] >ffff88807912b100: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb
[ 84.553463][ T5149] ^
[ 84.561420][ T5149] ffff88807912b180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 84.569522][ T5149] ffff88807912b200: fb fb fb fb fb fb fc fc fc fc fc fc fc fc fc fc
[ 84.577564][ T5149] ==================================================================
[ 84.589891][ T5149] Kernel panic - not syncing: KASAN: panic_on_warn set ...
[ 84.597220][ T5149] CPU: 1 UID: 0 PID: 5149 Comm: kworker/u9:1 Not tainted syzkaller #0 PREEMPT(full)
[ 84.606680][ T5149] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
[ 84.616748][ T5149] Workqueue: hci0 hci_cmd_work
[ 84.621514][ T5149] Call Trace:
[ 84.624787][ T5149] <TASK>
[ 84.627716][ T5149] dump_stack_lvl+0x99/0x250
[ 84.632304][ T5149] ? __asan_memcpy+0x40/0x70
[ 84.636901][ T5149] ? __pfx_dump_stack_lvl+0x10/0x10
[ 84.642098][ T5149] ? __pfx__printk+0x10/0x10
[ 84.646681][ T5149] vpanic+0x237/0x6d0
[ 84.650648][ T5149] ? __pfx_vpanic+0x10/0x10
[ 84.655134][ T5149] ? preempt_schedule+0xae/0xc0
[ 84.659973][ T5149] ? __pfx_preempt_schedule+0x10/0x10
[ 84.665424][ T5149] panic+0xb9/0xc0
[ 84.669144][ T5149] ? __pfx_panic+0x10/0x10
[ 84.673547][ T5149] ? _raw_spin_unlock_irqrestore+0xfd/0x110
[ 84.679427][ T5149] ? is_module_address+0x17/0xf0
[ 84.684353][ T5149] ? hci_cmd_work+0x5d0/0x7b0
[ 84.689108][ T5149] check_panic_on_warn+0x89/0xb0
[ 84.694039][ T5149] ? hci_cmd_work+0x5d0/0x7b0
[ 84.698796][ T5149] end_report+0x6f/0x160
[ 84.703026][ T5149] kasan_report+0x129/0x150
[ 84.707528][ T5149] ? hci_cmd_work+0x5d0/0x7b0
[ 84.712310][ T5149] hci_cmd_work+0x5d0/0x7b0
[ 84.716803][ T5149] ? process_one_work+0x868/0x15e0
[ 84.721908][ T5149] process_one_work+0x93a/0x15e0
[ 84.726862][ T5149] ? __lock_acquire+0xab9/0xd20
[ 84.731730][ T5149] ? __pfx_process_one_work+0x10/0x10
[ 84.737108][ T5149] ? assign_work+0x3a1/0x410
[ 84.741711][ T5149] worker_thread+0x9b0/0xee0
[ 84.746302][ T5149] kthread+0x711/0x8a0
[ 84.750365][ T5149] ? __pfx_worker_thread+0x10/0x10
[ 84.755468][ T5149] ? __pfx_kthread+0x10/0x10
[ 84.760051][ T5149] ? _raw_spin_unlock_irq+0x23/0x50
[ 84.765238][ T5149] ? lockdep_hardirqs_on+0x9c/0x150
[ 84.770437][ T5149] ? __pfx_kthread+0x10/0x10
[ 84.775024][ T5149] ret_from_fork+0x599/0xb30
[ 84.779604][ T5149] ? __pfx_ret_from_fork+0x10/0x10
[ 84.784708][ T5149] ? __switch_to_asm+0x39/0x70
[ 84.789477][ T5149] ? __switch_to_asm+0x33/0x70
[ 84.794236][ T5149] ? __pfx_kthread+0x10/0x10
[ 84.798902][ T5149] ret_from_fork_asm+0x1a/0x30
[ 84.803663][ T5149] </TASK>
[ 84.807193][ T5149] Kernel Offset: disabled
[ 84.811510][ T5149] Rebooting in 86400 seconds..
executor.cc:(.text._ZN10Connection7ConnectEPKcS1_[_ZN10Connection7ConnectEPKcS1_]+0x104): warning: Using 'gethostbyname' in statically linked applications requires at runtime the shared libraries from the glibc version used for linking
./tools/check-syzos.sh 2>/dev/null
Error text is too large and was truncated, full error text is at:
https://syzkaller.appspot.com/x/error.txt?x=15e3fb42580000
./tools/check-syzos.sh 2>/dev/null
Error text is too large and was truncated, full error text is at:
Tested on:
commit: 187dac29 Add linux-next specific files for 20251118
git tree: linux-next
kernel config: https://syzkaller.appspot.com/x/.config?x=f3aa05e175a53177
dashboard link: https://syzkaller.appspot.com/bug?extid=b4c65e7d749285a82467
compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
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