[v6.1] inconsistent lock state in trie_delete_elem
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syzbot
Dec 4, 2025, 11:53:33 AM (23 hours ago) Dec 4
to syzkaller...@googlegroups.com
Hello,
syzbot found the following issue on:
HEAD commit: f6e38ae624cf Linux 6.1.158
git tree: linux-6.1.y
console output: https://syzkaller.appspot.com/x/log.txt?x=164beab4580000
kernel config: https://syzkaller.appspot.com/x/.config?x=7eb38bd5021fec61
dashboard link: https://syzkaller.appspot.com/bug?extid=3af6f74a5ba50ad4b13d
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=1546301a580000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=143c3192580000
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/0d8305ca1c94/disk-f6e38ae6.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/8bc85383c07b/vmlinux-f6e38ae6.xz
kernel image: https://storage.googleapis.com/syzbot-assets/d337081bce56/bzImage-f6e38ae6.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+3af6f7...@syzkaller.appspotmail.com
================================
WARNING: inconsistent lock state
syzkaller #0 Not tainted
--------------------------------
inconsistent {INITIAL USE} -> {IN-NMI} usage.
syz.0.17/4424 [HC1[1]:SC0[0]:HE0:SE1] takes:
ffff88802aec1238 (&trie->lock){....}-{2:2}, at: trie_delete_elem+0x90/0x690 kernel/bpf/lpm_trie.c:467
{INITIAL USE} state was registered at:
lock_acquire+0x1b4/0x490 kernel/locking/lockdep.c:5662
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0xa4/0xf0 kernel/locking/spinlock.c:162
trie_delete_elem+0x90/0x690 kernel/bpf/lpm_trie.c:467
bpf_prog_0094bb5c89a0e79b+0x40/0x44
bpf_dispatcher_nop_func include/linux/bpf.h:1012 [inline]
__bpf_prog_run include/linux/filter.h:603 [inline]
bpf_prog_run include/linux/filter.h:610 [inline]
bpf_overflow_handler+0x525/0x7b0 kernel/events/core.c:10286
__perf_event_overflow+0x448/0x610 kernel/events/core.c:9496
perf_swevent_overflow kernel/events/core.c:9572 [inline]
perf_swevent_event+0x4ad/0x530 kernel/events/core.c:9610
perf_bp_event+0x23a/0x2a0 kernel/events/core.c:10478
hw_breakpoint_handler arch/x86/kernel/hw_breakpoint.c:555 [inline]
hw_breakpoint_exceptions_notify+0x152/0x470 arch/x86/kernel/hw_breakpoint.c:586
notifier_call_chain kernel/notifier.c:87 [inline]
atomic_notifier_call_chain+0x17a/0x2b0 kernel/notifier.c:225
notify_die+0x12d/0x180 kernel/notifier.c:593
notify_debug+0x20/0x30 arch/x86/kernel/traps.c:1018
exc_debug_user arch/x86/kernel/traps.c:1144 [inline]
noist_exc_debug+0x73/0x120 arch/x86/kernel/traps.c:1181
asm_exc_debug+0x2f/0x40 arch/x86/include/asm/idtentry.h:648
irq event stamp: 2574
hardirqs last enabled at (2573): [<ffffffff8a17a5c0>] exc_debug_kernel arch/x86/kernel/traps.c:1093 [inline]
hardirqs last enabled at (2573): [<ffffffff8a17a5c0>] exc_debug+0xf0/0x130 arch/x86/kernel/traps.c:1175
hardirqs last disabled at (2574): [<ffffffff8a17a53e>] exc_debug_kernel arch/x86/kernel/traps.c:1039 [inline]
hardirqs last disabled at (2574): [<ffffffff8a17a53e>] exc_debug+0x6e/0x130 arch/x86/kernel/traps.c:1175
softirqs last enabled at (2276): [<ffffffff818f072f>] bpf_prog_load+0x117f/0x15a0 kernel/bpf/syscall.c:2674
softirqs last disabled at (2274): [<ffffffff818d4a79>] spin_lock_bh include/linux/spinlock.h:356 [inline]
softirqs last disabled at (2274): [<ffffffff818d4a79>] bpf_ksym_add+0x29/0x340 kernel/bpf/core.c:649
other info that might help us debug this:
Possible unsafe locking scenario:
CPU0
----
lock(&trie->lock);
<Interrupt>
lock(&trie->lock);
*** DEADLOCK ***
no locks held by syz.0.17/4424.
stack backtrace:
CPU: 0 PID: 4424 Comm: syz.0.17 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Call Trace:
<#DB>
dump_stack_lvl+0x168/0x22e lib/dump_stack.c:106
lock_acquire+0x2ce/0x490 kernel/locking/lockdep.c:5653
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0xa4/0xf0 kernel/locking/spinlock.c:162
trie_delete_elem+0x90/0x690 kernel/bpf/lpm_trie.c:467
bpf_prog_0094bb5c89a0e79b+0x40/0x44
bpf_dispatcher_nop_func include/linux/bpf.h:1012 [inline]
__bpf_prog_run include/linux/filter.h:603 [inline]
bpf_prog_run include/linux/filter.h:610 [inline]
bpf_overflow_handler+0x525/0x7b0 kernel/events/core.c:10286
__perf_event_overflow+0x448/0x610 kernel/events/core.c:9496
perf_swevent_overflow kernel/events/core.c:9572 [inline]
perf_swevent_event+0x4ad/0x530 kernel/events/core.c:9610
perf_bp_event+0x23a/0x2a0 kernel/events/core.c:10478
hw_breakpoint_handler arch/x86/kernel/hw_breakpoint.c:555 [inline]
hw_breakpoint_exceptions_notify+0x152/0x470 arch/x86/kernel/hw_breakpoint.c:586
notifier_call_chain kernel/notifier.c:87 [inline]
atomic_notifier_call_chain+0x17a/0x2b0 kernel/notifier.c:225
notify_die+0x12d/0x180 kernel/notifier.c:593
notify_debug+0x20/0x30 arch/x86/kernel/traps.c:1018
exc_debug_kernel arch/x86/kernel/traps.c:1075 [inline]
exc_debug+0xd9/0x130 arch/x86/kernel/traps.c:1175
asm_exc_debug+0x1a/0x40 arch/x86/include/asm/idtentry.h:648
RIP: 0010:copy_user_enhanced_fast_string+0xa/0x40 arch/x86/lib/copy_user_64.S:166
Code: ff c9 75 f2 89 d1 c1 e9 03 83 e2 07 f3 48 a5 89 d1 f3 a4 31 c0 0f 01 ca c3 8d 0c ca 89 ca eb 20 0f 01 cb 83 fa 40 72 38 89 d1 <f3> a4 31 c0 0f 01 ca c3 89 ca eb 0a 90 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffc900032e7c28 EFLAGS: 00050206
RAX: ffffffff84072901 RBX: 0000000000000e40 RCX: 0000000000000dfd
RDX: 0000000000000e40 RSI: 0000200000000303 RDI: ffff888079fbc083
RBP: 0000000000000000 R08: dffffc0000000000 R09: ffffed100f3f79d0
R10: 0000000000000000 R11: 00000000000001c8 R12: 00007fffffffe1c0
R13: dffffc0000000000 R14: ffff888079fbc040 R15: 00002000000002c0
</#DB>
<TASK>
copy_user_generic arch/x86/include/asm/uaccess_64.h:37 [inline]
raw_copy_from_user arch/x86/include/asm/uaccess_64.h:52 [inline]
_copy_from_user+0xf4/0x170 lib/usercopy.c:23
copy_from_user include/linux/uaccess.h:161 [inline]
bpf_test_init net/bpf/test_run.c:779 [inline]
bpf_prog_test_run_skb+0x258/0x11b0 net/bpf/test_run.c:1100
bpf_prog_test_run+0x31e/0x390 kernel/bpf/syscall.c:3692
__sys_bpf+0x593/0x6d0 kernel/bpf/syscall.c:5045
__do_sys_bpf kernel/bpf/syscall.c:5131 [inline]
__se_sys_bpf kernel/bpf/syscall.c:5129 [inline]
__x64_sys_bpf+0x78/0x90 kernel/bpf/syscall.c:5129
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f62bb18f749
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:00007ffec3f8a6e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007f62bb3e5fa0 RCX: 00007f62bb18f749
RDX: 000000000000004c RSI: 0000200000000240 RDI: 000000000000000a
RBP: 00007f62bb213f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f62bb3e5fa0 R14: 00007f62bb3e5fa0 R15: 0000000000000003
</TASK>
----------------
Code disassembly (best guess):
0: ff c9 dec %ecx
2: 75 f2 jne 0xfffffff6
4: 89 d1 mov %edx,%ecx
6: c1 e9 03 shr $0x3,%ecx
9: 83 e2 07 and $0x7,%edx
c: f3 48 a5 rep movsq %ds:(%rsi),%es:(%rdi)
f: 89 d1 mov %edx,%ecx
11: f3 a4 rep movsb %ds:(%rsi),%es:(%rdi)
13: 31 c0 xor %eax,%eax
15: 0f 01 ca clac
18: c3 ret
19: 8d 0c ca lea (%rdx,%rcx,8),%ecx
1c: 89 ca mov %ecx,%edx
1e: eb 20 jmp 0x40
20: 0f 01 cb stac
23: 83 fa 40 cmp $0x40,%edx
26: 72 38 jb 0x60
28: 89 d1 mov %edx,%ecx
* 2a: f3 a4 rep movsb %ds:(%rsi),%es:(%rdi) <-- trapping instruction
2c: 31 c0 xor %eax,%eax
2e: 0f 01 ca clac
31: c3 ret
32: 89 ca mov %ecx,%edx
34: eb 0a jmp 0x40
36: 90 nop
37: 90 nop
38: 90 nop
39: 90 nop
3a: 90 nop
3b: 90 nop
3c: 90 nop
3d: 90 nop
3e: 90 nop
3f: 90 nop
---
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: f6e38ae624cf Linux 6.1.158
git tree: linux-6.1.y
console output: https://syzkaller.appspot.com/x/log.txt?x=164beab4580000
kernel config: https://syzkaller.appspot.com/x/.config?x=7eb38bd5021fec61
dashboard link: https://syzkaller.appspot.com/bug?extid=3af6f74a5ba50ad4b13d
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=1546301a580000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=143c3192580000
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/0d8305ca1c94/disk-f6e38ae6.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/8bc85383c07b/vmlinux-f6e38ae6.xz
kernel image: https://storage.googleapis.com/syzbot-assets/d337081bce56/bzImage-f6e38ae6.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+3af6f7...@syzkaller.appspotmail.com
================================
WARNING: inconsistent lock state
syzkaller #0 Not tainted
--------------------------------
inconsistent {INITIAL USE} -> {IN-NMI} usage.
syz.0.17/4424 [HC1[1]:SC0[0]:HE0:SE1] takes:
ffff88802aec1238 (&trie->lock){....}-{2:2}, at: trie_delete_elem+0x90/0x690 kernel/bpf/lpm_trie.c:467
{INITIAL USE} state was registered at:
lock_acquire+0x1b4/0x490 kernel/locking/lockdep.c:5662
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0xa4/0xf0 kernel/locking/spinlock.c:162
trie_delete_elem+0x90/0x690 kernel/bpf/lpm_trie.c:467
bpf_prog_0094bb5c89a0e79b+0x40/0x44
bpf_dispatcher_nop_func include/linux/bpf.h:1012 [inline]
__bpf_prog_run include/linux/filter.h:603 [inline]
bpf_prog_run include/linux/filter.h:610 [inline]
bpf_overflow_handler+0x525/0x7b0 kernel/events/core.c:10286
__perf_event_overflow+0x448/0x610 kernel/events/core.c:9496
perf_swevent_overflow kernel/events/core.c:9572 [inline]
perf_swevent_event+0x4ad/0x530 kernel/events/core.c:9610
perf_bp_event+0x23a/0x2a0 kernel/events/core.c:10478
hw_breakpoint_handler arch/x86/kernel/hw_breakpoint.c:555 [inline]
hw_breakpoint_exceptions_notify+0x152/0x470 arch/x86/kernel/hw_breakpoint.c:586
notifier_call_chain kernel/notifier.c:87 [inline]
atomic_notifier_call_chain+0x17a/0x2b0 kernel/notifier.c:225
notify_die+0x12d/0x180 kernel/notifier.c:593
notify_debug+0x20/0x30 arch/x86/kernel/traps.c:1018
exc_debug_user arch/x86/kernel/traps.c:1144 [inline]
noist_exc_debug+0x73/0x120 arch/x86/kernel/traps.c:1181
asm_exc_debug+0x2f/0x40 arch/x86/include/asm/idtentry.h:648
irq event stamp: 2574
hardirqs last enabled at (2573): [<ffffffff8a17a5c0>] exc_debug_kernel arch/x86/kernel/traps.c:1093 [inline]
hardirqs last enabled at (2573): [<ffffffff8a17a5c0>] exc_debug+0xf0/0x130 arch/x86/kernel/traps.c:1175
hardirqs last disabled at (2574): [<ffffffff8a17a53e>] exc_debug_kernel arch/x86/kernel/traps.c:1039 [inline]
hardirqs last disabled at (2574): [<ffffffff8a17a53e>] exc_debug+0x6e/0x130 arch/x86/kernel/traps.c:1175
softirqs last enabled at (2276): [<ffffffff818f072f>] bpf_prog_load+0x117f/0x15a0 kernel/bpf/syscall.c:2674
softirqs last disabled at (2274): [<ffffffff818d4a79>] spin_lock_bh include/linux/spinlock.h:356 [inline]
softirqs last disabled at (2274): [<ffffffff818d4a79>] bpf_ksym_add+0x29/0x340 kernel/bpf/core.c:649
other info that might help us debug this:
Possible unsafe locking scenario:
CPU0
----
lock(&trie->lock);
<Interrupt>
lock(&trie->lock);
*** DEADLOCK ***
no locks held by syz.0.17/4424.
stack backtrace:
CPU: 0 PID: 4424 Comm: syz.0.17 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Call Trace:
<#DB>
dump_stack_lvl+0x168/0x22e lib/dump_stack.c:106
lock_acquire+0x2ce/0x490 kernel/locking/lockdep.c:5653
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0xa4/0xf0 kernel/locking/spinlock.c:162
trie_delete_elem+0x90/0x690 kernel/bpf/lpm_trie.c:467
bpf_prog_0094bb5c89a0e79b+0x40/0x44
bpf_dispatcher_nop_func include/linux/bpf.h:1012 [inline]
__bpf_prog_run include/linux/filter.h:603 [inline]
bpf_prog_run include/linux/filter.h:610 [inline]
bpf_overflow_handler+0x525/0x7b0 kernel/events/core.c:10286
__perf_event_overflow+0x448/0x610 kernel/events/core.c:9496
perf_swevent_overflow kernel/events/core.c:9572 [inline]
perf_swevent_event+0x4ad/0x530 kernel/events/core.c:9610
perf_bp_event+0x23a/0x2a0 kernel/events/core.c:10478
hw_breakpoint_handler arch/x86/kernel/hw_breakpoint.c:555 [inline]
hw_breakpoint_exceptions_notify+0x152/0x470 arch/x86/kernel/hw_breakpoint.c:586
notifier_call_chain kernel/notifier.c:87 [inline]
atomic_notifier_call_chain+0x17a/0x2b0 kernel/notifier.c:225
notify_die+0x12d/0x180 kernel/notifier.c:593
notify_debug+0x20/0x30 arch/x86/kernel/traps.c:1018
exc_debug_kernel arch/x86/kernel/traps.c:1075 [inline]
exc_debug+0xd9/0x130 arch/x86/kernel/traps.c:1175
asm_exc_debug+0x1a/0x40 arch/x86/include/asm/idtentry.h:648
RIP: 0010:copy_user_enhanced_fast_string+0xa/0x40 arch/x86/lib/copy_user_64.S:166
Code: ff c9 75 f2 89 d1 c1 e9 03 83 e2 07 f3 48 a5 89 d1 f3 a4 31 c0 0f 01 ca c3 8d 0c ca 89 ca eb 20 0f 01 cb 83 fa 40 72 38 89 d1 <f3> a4 31 c0 0f 01 ca c3 89 ca eb 0a 90 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffc900032e7c28 EFLAGS: 00050206
RAX: ffffffff84072901 RBX: 0000000000000e40 RCX: 0000000000000dfd
RDX: 0000000000000e40 RSI: 0000200000000303 RDI: ffff888079fbc083
RBP: 0000000000000000 R08: dffffc0000000000 R09: ffffed100f3f79d0
R10: 0000000000000000 R11: 00000000000001c8 R12: 00007fffffffe1c0
R13: dffffc0000000000 R14: ffff888079fbc040 R15: 00002000000002c0
</#DB>
<TASK>
copy_user_generic arch/x86/include/asm/uaccess_64.h:37 [inline]
raw_copy_from_user arch/x86/include/asm/uaccess_64.h:52 [inline]
_copy_from_user+0xf4/0x170 lib/usercopy.c:23
copy_from_user include/linux/uaccess.h:161 [inline]
bpf_test_init net/bpf/test_run.c:779 [inline]
bpf_prog_test_run_skb+0x258/0x11b0 net/bpf/test_run.c:1100
bpf_prog_test_run+0x31e/0x390 kernel/bpf/syscall.c:3692
__sys_bpf+0x593/0x6d0 kernel/bpf/syscall.c:5045
__do_sys_bpf kernel/bpf/syscall.c:5131 [inline]
__se_sys_bpf kernel/bpf/syscall.c:5129 [inline]
__x64_sys_bpf+0x78/0x90 kernel/bpf/syscall.c:5129
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f62bb18f749
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:00007ffec3f8a6e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007f62bb3e5fa0 RCX: 00007f62bb18f749
RDX: 000000000000004c RSI: 0000200000000240 RDI: 000000000000000a
RBP: 00007f62bb213f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f62bb3e5fa0 R14: 00007f62bb3e5fa0 R15: 0000000000000003
</TASK>
----------------
Code disassembly (best guess):
0: ff c9 dec %ecx
2: 75 f2 jne 0xfffffff6
4: 89 d1 mov %edx,%ecx
6: c1 e9 03 shr $0x3,%ecx
9: 83 e2 07 and $0x7,%edx
c: f3 48 a5 rep movsq %ds:(%rsi),%es:(%rdi)
f: 89 d1 mov %edx,%ecx
11: f3 a4 rep movsb %ds:(%rsi),%es:(%rdi)
13: 31 c0 xor %eax,%eax
15: 0f 01 ca clac
18: c3 ret
19: 8d 0c ca lea (%rdx,%rcx,8),%ecx
1c: 89 ca mov %ecx,%edx
1e: eb 20 jmp 0x40
20: 0f 01 cb stac
23: 83 fa 40 cmp $0x40,%edx
26: 72 38 jb 0x60
28: 89 d1 mov %edx,%ecx
* 2a: f3 a4 rep movsb %ds:(%rsi),%es:(%rdi) <-- trapping instruction
2c: 31 c0 xor %eax,%eax
2e: 0f 01 ca clac
31: c3 ret
32: 89 ca mov %ecx,%edx
34: eb 0a jmp 0x40
36: 90 nop
37: 90 nop
38: 90 nop
39: 90 nop
3a: 90 nop
3b: 90 nop
3c: 90 nop
3d: 90 nop
3e: 90 nop
3f: 90 nop
---
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
Dec 4, 2025, 12:55:34 PM (22 hours ago) Dec 4
to syzkaller...@googlegroups.com
Hello,
syzbot found the following issue on:
HEAD commit: cc5ec8769306 Linux 5.15.196
syzbot found the following issue on:
git tree: linux-5.15.y
console output: https://syzkaller.appspot.com/x/log.txt?x=14ea3192580000
kernel config: https://syzkaller.appspot.com/x/.config?x=e1bb6d24ef2164eb
dashboard link: https://syzkaller.appspot.com/bug?extid=644bfebcf8f53278b7e5
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=15483cc2580000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=15cbc01a580000
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/ed7568bc5bb4/disk-cc5ec876.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/e343e0aaac77/vmlinux-cc5ec876.xz
kernel image: https://storage.googleapis.com/syzbot-assets/089870f2a980/bzImage-cc5ec876.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
================================
WARNING: inconsistent lock state
syzkaller #0 Not tainted
--------------------------------
inconsistent {INITIAL USE} -> {IN-NMI} usage.
ffff888147dc4a38 (&trie->lock){....}-{2:2}, at: trie_delete_elem+0x90/0x710 kernel/bpf/lpm_trie.c:467
{INITIAL USE} state was registered at:
lock_acquire+0x197/0x3f0 kernel/locking/lockdep.c:5623
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0xa4/0xf0 kernel/locking/spinlock.c:162
trie_delete_elem+0x90/0x710 kernel/bpf/lpm_trie.c:467
_raw_spin_lock_irqsave+0xa4/0xf0 kernel/locking/spinlock.c:162
bpf_prog_0094bb5c89a0e79b+0x40/0xa8
bpf_dispatcher_nop_func include/linux/bpf.h:888 [inline]
__bpf_prog_run include/linux/filter.h:628 [inline]
bpf_prog_run include/linux/filter.h:635 [inline]
bpf_overflow_handler+0x1c4/0x4c0 kernel/events/core.c:10297
__perf_event_overflow+0x364/0x530 kernel/events/core.c:9515
perf_swevent_overflow kernel/events/core.c:9591 [inline]
perf_swevent_event+0x4ad/0x530 kernel/events/core.c:9629
perf_bp_event+0x224/0x290 kernel/events/core.c:10484
hw_breakpoint_handler arch/x86/kernel/hw_breakpoint.c:555 [inline]
hw_breakpoint_exceptions_notify+0x152/0x470 arch/x86/kernel/hw_breakpoint.c:586
notifier_call_chain kernel/notifier.c:83 [inline]
hw_breakpoint_exceptions_notify+0x152/0x470 arch/x86/kernel/hw_breakpoint.c:586
atomic_notifier_call_chain+0x15d/0x280 kernel/notifier.c:198
notify_die+0x12d/0x180 kernel/notifier.c:529
notify_debug+0x20/0x30 arch/x86/kernel/traps.c:872
exc_debug_user arch/x86/kernel/traps.c:998 [inline]
noist_exc_debug+0x73/0x120 arch/x86/kernel/traps.c:1035
asm_exc_debug+0x2f/0x40 arch/x86/include/asm/idtentry.h:642
irq event stamp: 7470
hardirqs last enabled at (7469): [<ffffffff89a949f6>] exc_debug_kernel arch/x86/kernel/traps.c:947 [inline]
hardirqs last enabled at (7469): [<ffffffff89a949f6>] exc_debug+0xe6/0x130 arch/x86/kernel/traps.c:1029
hardirqs last disabled at (7470): [<ffffffff89a9497e>] exc_debug_kernel arch/x86/kernel/traps.c:893 [inline]
hardirqs last disabled at (7470): [<ffffffff89a9497e>] exc_debug+0x6e/0x130 arch/x86/kernel/traps.c:1029
softirqs last enabled at (7276): [<ffffffff81856560>] bpf_prog_load+0x1150/0x1550 kernel/bpf/syscall.c:2380
softirqs last disabled at (7274): [<ffffffff8183c969>] spin_lock_bh include/linux/spinlock.h:369 [inline]
softirqs last disabled at (7274): [<ffffffff8183c969>] bpf_ksym_add+0x29/0x340 kernel/bpf/core.c:633
other info that might help us debug this:
Possible unsafe locking scenario:
CPU0
----
lock(&trie->lock);
<Interrupt>
lock(&trie->lock);
*** DEADLOCK ***
stack backtrace:
CPU: 1 PID: 4355 Comm: syz.0.17 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Call Trace:
<#DB>
dump_stack_lvl+0x168/0x230 lib/dump_stack.c:106
Call Trace:
<#DB>
lock_acquire+0x2b2/0x3f0 kernel/locking/lockdep.c:5614
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0xa4/0xf0 kernel/locking/spinlock.c:162
trie_delete_elem+0x90/0x710 kernel/bpf/lpm_trie.c:467
_raw_spin_lock_irqsave+0xa4/0xf0 kernel/locking/spinlock.c:162
bpf_prog_0094bb5c89a0e79b+0x40/0xa8
bpf_dispatcher_nop_func include/linux/bpf.h:888 [inline]
__bpf_prog_run include/linux/filter.h:628 [inline]
bpf_prog_run include/linux/filter.h:635 [inline]
bpf_overflow_handler+0x1c4/0x4c0 kernel/events/core.c:10297
__perf_event_overflow+0x364/0x530 kernel/events/core.c:9515
perf_swevent_overflow kernel/events/core.c:9591 [inline]
perf_swevent_event+0x4ad/0x530 kernel/events/core.c:9629
perf_bp_event+0x224/0x290 kernel/events/core.c:10484
hw_breakpoint_handler arch/x86/kernel/hw_breakpoint.c:555 [inline]
hw_breakpoint_exceptions_notify+0x152/0x470 arch/x86/kernel/hw_breakpoint.c:586
notifier_call_chain kernel/notifier.c:83 [inline]
hw_breakpoint_exceptions_notify+0x152/0x470 arch/x86/kernel/hw_breakpoint.c:586
atomic_notifier_call_chain+0x15d/0x280 kernel/notifier.c:198
notify_die+0x12d/0x180 kernel/notifier.c:529
notify_debug+0x20/0x30 arch/x86/kernel/traps.c:872
exc_debug_kernel arch/x86/kernel/traps.c:929 [inline]
exc_debug+0xcf/0x130 arch/x86/kernel/traps.c:1029
asm_exc_debug+0x1a/0x40 arch/x86/include/asm/idtentry.h:642
RIP: 0010:copy_user_enhanced_fast_string+0xe/0x40 arch/x86/lib/copy_user_64.S:206
Code: 89 d1 c1 e9 03 83 e2 07 f3 48 a5 89 d1 f3 a4 31 c0 0f 01 ca c3 90 90 90 90 90 90 90 0f 01 cb 83 fa 40 0f 82 70 ff ff ff 89 d1 <f3> a4 31 c0 0f 01 ca c3 90 90 90 90 90 90 90 90 90 90 89 d1 83 f8
RSP: 0018:ffffc90003f8fc18 EFLAGS: 00050206
RAX: ffffffff83daed01 RBX: 0000000000000e40 RCX: 0000000000000dfd
RDX: 0000000000000e40 RSI: 0000200000000303 RDI: ffff88807b87e083
RBP: 0000000000000000 R08: dffffc0000000000 R09: ffffed100f70fdd0
R10: 0000000000000000 R11: 00000000000001c8 R12: 00007ffffffff000
R13: 0000200000001100 R14: ffff88807b87e040 R15: 00002000000002c0
</#DB>
<TASK>
copy_user_generic arch/x86/include/asm/uaccess_64.h:37 [inline]
raw_copy_from_user arch/x86/include/asm/uaccess_64.h:52 [inline]
_copy_from_user+0xfa/0x170 lib/usercopy.c:23
<TASK>
copy_user_generic arch/x86/include/asm/uaccess_64.h:37 [inline]
raw_copy_from_user arch/x86/include/asm/uaccess_64.h:52 [inline]
copy_from_user include/linux/uaccess.h:192 [inline]
bpf_test_init+0x136/0x1b0 net/bpf/test_run.c:267
bpf_prog_test_run_skb+0x181/0x1180 net/bpf/test_run.c:587
bpf_prog_test_run+0x31e/0x390 kernel/bpf/syscall.c:3374
__sys_bpf+0x535/0x670 kernel/bpf/syscall.c:4675
__do_sys_bpf kernel/bpf/syscall.c:4761 [inline]
__se_sys_bpf kernel/bpf/syscall.c:4759 [inline]
__x64_sys_bpf+0x78/0x90 kernel/bpf/syscall.c:4759
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: 0033:0x7f460e062749
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:00007fff3a4d1378 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007f460e2b8fa0 RCX: 00007f460e062749
RDX: 000000000000004c RSI: 0000200000000240 RDI: 000000000000000a
RBP: 00007f460e0e6f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f460e2b8fa0 R14: 00007f460e2b8fa0 R15: 0000000000000003
</TASK>
----------------
Code disassembly (best guess):
0: 89 d1 mov %edx,%ecx
----------------
Code disassembly (best guess):
2: c1 e9 03 shr $0x3,%ecx
5: 83 e2 07 and $0x7,%edx
8: f3 48 a5 rep movsq %ds:(%rsi),%es:(%rdi)
b: 89 d1 mov %edx,%ecx
d: f3 a4 rep movsb %ds:(%rsi),%es:(%rdi)
f: 31 c0 xor %eax,%eax
11: 0f 01 ca clac
14: c3 ret
15: 90 nop
16: 90 nop
17: 90 nop
18: 90 nop
19: 90 nop
1a: 90 nop
1b: 90 nop
1c: 0f 01 cb stac
1f: 83 fa 40 cmp $0x40,%edx
22: 0f 82 70 ff ff ff jb 0xffffff98
28: 89 d1 mov %edx,%ecx
* 2a: f3 a4 rep movsb %ds:(%rsi),%es:(%rdi) <-- trapping instruction
2c: 31 c0 xor %eax,%eax
2e: 0f 01 ca clac
31: c3 ret
32: 90 nop
* 2a: f3 a4 rep movsb %ds:(%rsi),%es:(%rdi) <-- trapping instruction
2c: 31 c0 xor %eax,%eax
2e: 0f 01 ca clac
31: c3 ret
33: 90 nop
34: 90 nop
35: 90 nop
36: 90 nop
37: 90 nop
38: 90 nop
39: 90 nop
3a: 90 nop
3b: 90 nop
3c: 89 d1 mov %edx,%ecx
37: 90 nop
38: 90 nop
39: 90 nop
3a: 90 nop
3b: 90 nop
3e: 83 .byte 0x83
3f: f8 clc
syzbot
Dec 4, 2025, 3:31:29 PM (19 hours ago) Dec 4
to syzkaller...@googlegroups.com
Hello,
syzbot found the following issue on:
HEAD commit: 4791134e4aeb Linux 6.6.118
syzbot found the following issue on:
git tree: linux-6.6.y
console output: https://syzkaller.appspot.com/x/log.txt?x=1778201a580000
kernel config: https://syzkaller.appspot.com/x/.config?x=12606d4b8832c7e4
dashboard link: https://syzkaller.appspot.com/bug?extid=c6034ccd86fad3483e8c
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=16f93192580000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=163a3cc2580000
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/d5853385c5d5/disk-4791134e.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/13d5cf580b4d/vmlinux-4791134e.xz
kernel image: https://storage.googleapis.com/syzbot-assets/a9536fd663f0/bzImage-4791134e.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
================================
WARNING: inconsistent lock state
syzkaller #0 Not tainted
--------------------------------
inconsistent {INITIAL USE} -> {IN-NMI} usage.
ffff888030bdf238 (&trie->lock){....}-{2:2}, at: trie_delete_elem+0x96/0x6a0 kernel/bpf/lpm_trie.c:467
{INITIAL USE} state was registered at:
lock_acquire+0x197/0x410 kernel/locking/lockdep.c:5754
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0xa8/0xf0 kernel/locking/spinlock.c:162
trie_delete_elem+0x96/0x6a0 kernel/bpf/lpm_trie.c:467
bpf_prog_0094bb5c89a0e79b+0x48/0x4c
bpf_dispatcher_nop_func include/linux/bpf.h:1224 [inline]
__bpf_prog_run include/linux/filter.h:612 [inline]
bpf_prog_run include/linux/filter.h:619 [inline]
bpf_overflow_handler+0x1f9/0x4f0 kernel/events/core.c:10547
__perf_event_overflow+0x447/0x630 kernel/events/core.c:9718
perf_swevent_overflow kernel/events/core.c:9794 [inline]
perf_swevent_event+0x4de/0x5c0 kernel/events/core.c:9832
perf_bp_event+0x252/0x300 kernel/events/core.c:10739
hw_breakpoint_handler arch/x86/kernel/hw_breakpoint.c:555 [inline]
hw_breakpoint_exceptions_notify+0x23e/0x670 arch/x86/kernel/hw_breakpoint.c:586
notifier_call_chain+0x197/0x390 kernel/notifier.c:93
atomic_notifier_call_chain+0xda/0x180 kernel/notifier.c:231
notify_die+0x131/0x180 kernel/notifier.c:596
notify_debug+0x2e/0x50 arch/x86/kernel/traps.c:1042
exc_debug_user arch/x86/kernel/traps.c:1168 [inline]
noist_exc_debug+0x77/0x120 arch/x86/kernel/traps.c:1205
asm_exc_debug+0x33/0x40 arch/x86/include/asm/idtentry.h:644
irq event stamp: 2582
hardirqs last enabled at (2581): [<ffffffff8a6eebfd>] exc_debug_kernel arch/x86/kernel/traps.c:1117 [inline]
hardirqs last enabled at (2581): [<ffffffff8a6eebfd>] exc_debug+0xfd/0x140 arch/x86/kernel/traps.c:1199
hardirqs last disabled at (2582): [<ffffffff8a6eeb7b>] exc_debug_kernel arch/x86/kernel/traps.c:1063 [inline]
hardirqs last disabled at (2582): [<ffffffff8a6eeb7b>] exc_debug+0x7b/0x140 arch/x86/kernel/traps.c:1199
softirqs last enabled at (2274): [<ffffffff8194a352>] bpf_prog_load+0x12f2/0x16d0 kernel/bpf/syscall.c:2776
softirqs last disabled at (2272): [<ffffffff8192b10d>] spin_lock_bh include/linux/spinlock.h:356 [inline]
softirqs last disabled at (2272): [<ffffffff8192b10d>] bpf_ksym_add+0x2d/0x340 kernel/bpf/core.c:655
other info that might help us debug this:
Possible unsafe locking scenario:
CPU0
----
lock(&trie->lock);
<Interrupt>
lock(&trie->lock);
*** DEADLOCK ***
stack backtrace:
CPU: 0 PID: 5954 Comm: syz.0.17 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Call Trace:
<#DB>
dump_stack_lvl+0x16c/0x230 lib/dump_stack.c:106
Call Trace:
<#DB>
lock_acquire+0x2b1/0x410 kernel/locking/lockdep.c:5745
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0xa8/0xf0 kernel/locking/spinlock.c:162
trie_delete_elem+0x96/0x6a0 kernel/bpf/lpm_trie.c:467
bpf_prog_0094bb5c89a0e79b+0x48/0x4c
bpf_dispatcher_nop_func include/linux/bpf.h:1224 [inline]
__bpf_prog_run include/linux/filter.h:612 [inline]
bpf_prog_run include/linux/filter.h:619 [inline]
bpf_overflow_handler+0x1f9/0x4f0 kernel/events/core.c:10547
__perf_event_overflow+0x447/0x630 kernel/events/core.c:9718
perf_swevent_overflow kernel/events/core.c:9794 [inline]
perf_swevent_event+0x4de/0x5c0 kernel/events/core.c:9832
perf_bp_event+0x252/0x300 kernel/events/core.c:10739
hw_breakpoint_handler arch/x86/kernel/hw_breakpoint.c:555 [inline]
hw_breakpoint_exceptions_notify+0x23e/0x670 arch/x86/kernel/hw_breakpoint.c:586
notifier_call_chain+0x197/0x390 kernel/notifier.c:93
atomic_notifier_call_chain+0xda/0x180 kernel/notifier.c:231
notify_die+0x131/0x180 kernel/notifier.c:596
notify_debug+0x2e/0x50 arch/x86/kernel/traps.c:1042
exc_debug_kernel arch/x86/kernel/traps.c:1099 [inline]
exc_debug+0xe6/0x140 arch/x86/kernel/traps.c:1199
asm_exc_debug+0x1e/0x40 arch/x86/include/asm/idtentry.h:644
RIP: 0010:rep_movs_alternative+0x4a/0x90 arch/x86/lib/copy_user_64.S:71
Code: 75 f1 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 48 8b 06 48 89 07 48 83 c6 08 48 83 c7 08 83 e9 08 74 df 83 f9 08 73 e8 eb c9 <f3> a4 c3 48 8b 06 48 89 07 48 8d 47 08 48 83 e0 f8 48 29 f8 48 01
RSP: 0018:ffffc90003287c38 EFLAGS: 00050206
RAX: ffffffff841f3d01 RBX: 0000000000000e40 RCX: 0000000000000dfd
RDX: 0000000000000001 RSI: 0000200000000303 RDI: ffff88802b88e083
RBP: ffff88802b88e000 R08: ffff88802b88ee7f R09: 1ffff11005711dcf
R10: dffffc0000000000 R11: ffffed1005711dd0 R12: 0000200000001100
R13: dffffc0000000000 R14: ffff88802b88e040 R15: 00002000000002c0
</#DB>
<TASK>
copy_user_generic arch/x86/include/asm/uaccess_64.h:112 [inline]
raw_copy_from_user arch/x86/include/asm/uaccess_64.h:127 [inline]
_copy_from_user+0x8b/0xe0 lib/usercopy.c:23
copy_from_user include/linux/uaccess.h:183 [inline]
bpf_test_init net/bpf/test_run.c:641 [inline]
bpf_prog_test_run_skb+0x259/0x11c0 net/bpf/test_run.c:967
bpf_prog_test_run+0x321/0x390 kernel/bpf/syscall.c:4129
__sys_bpf+0x440/0x800 kernel/bpf/syscall.c:5491
__do_sys_bpf kernel/bpf/syscall.c:5577 [inline]
__se_sys_bpf kernel/bpf/syscall.c:5575 [inline]
__x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5575
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f24b6b8f749
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:00007ffd057a92c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007f24b6de5fa0 RCX: 00007f24b6b8f749
RDX: 000000000000004c RSI: 0000200000000240 RDI: 000000000000000a
RBP: 00007f24b6c13f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f24b6de5fa0 R14: 00007f24b6de5fa0 R15: 0000000000000003
</TASK>
----------------
Code disassembly (best guess):
0: 75 f1 jne 0xfffffff3
----------------
Code disassembly (best guess):
2: c3 ret
3: 66 2e 0f 1f 84 00 00 cs nopw 0x0(%rax,%rax,1)
a: 00 00 00
d: 0f 1f 00 nopl (%rax)
10: 48 8b 06 mov (%rsi),%rax
13: 48 89 07 mov %rax,(%rdi)
16: 48 83 c6 08 add $0x8,%rsi
1a: 48 83 c7 08 add $0x8,%rdi
1e: 83 e9 08 sub $0x8,%ecx
21: 74 df je 0x2
23: 83 f9 08 cmp $0x8,%ecx
26: 73 e8 jae 0x10
28: eb c9 jmp 0xfffffff3
* 2a: f3 a4 rep movsb %ds:(%rsi),%es:(%rdi) <-- trapping instruction
2c: c3 ret
2d: 48 8b 06 mov (%rsi),%rax
30: 48 89 07 mov %rax,(%rdi)
33: 48 8d 47 08 lea 0x8(%rdi),%rax
37: 48 83 e0 f8 and $0xfffffffffffffff8,%rax
3b: 48 29 f8 sub %rdi,%rax
3e: 48 rex.W
3f: 01 .byte 0x1
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