general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
CPU: 1 PID: 4672 Comm: syz.2.71 Not tainted 6.1.139-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:llc_conn_state_process+0xcba/0x1290 net/llc/llc_conn.c:-1
Code: 84 db 0f 94 c0 4d 8b 36 8d 54 00 01 b8 01 00 00 00 bd 07 00 00 00 0f 44 e8 4c 89 f0 48 c1 e8 03 48 bb 00 00 00 00 00 fc ff df <0f> b6 04 18 84 c0 0f 85 7e 05 00 00 41 89 16 41 0f b6 04 1c 84 c0
RSP: 0018:ffffc900001e0aa8 EFLAGS: 00010246
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: 0000000000000100
RDX: 0000000000000001 RSI: 0000000000000002 RDI: 0000000000000000
RBP: 0000000000000007 R08: ffff88801c3a3b80 R09: 0000000000000005
R10: 0000000000000005 R11: 0000000000000100 R12: 1ffff1100b42d002
R13: ffff88805a168000 R14: 0000000000000000 R15: ffff88805a168012
FS: 00007fd0c2c656c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055557c6e2808 CR3: 0000000028b91000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<IRQ>
llc_process_tmr_ev net/llc/llc_c_ac.c:1445 [inline]
llc_conn_tmr_common_cb+0x336/0x8a0 net/llc/llc_c_ac.c:1331
call_timer_fn+0x1a0/0x670 kernel/time/timer.c:1504
expire_timers kernel/time/timer.c:1549 [inline]
__run_timers+0x525/0x7c0 kernel/time/timer.c:1820
run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1833
handle_softirqs+0x2a1/0x920 kernel/softirq.c:578
__do_softirq kernel/softirq.c:612 [inline]
invoke_softirq kernel/softirq.c:452 [inline]
__irq_exit_rcu+0x12f/0x220 kernel/softirq.c:661
irq_exit_rcu+0x5/0x20 kernel/softirq.c:673
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1118 [inline]
sysvec_apic_timer_interrupt+0xa0/0xc0 arch/x86/kernel/apic/apic.c:1118
</IRQ>
<TASK>
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:__sanitizer_cov_trace_pc+0x53/0x60 kernel/kcov.c:232
Code: 00 74 2c 8b 91 f8 15 00 00 83 fa 02 75 21 48 8b 91 00 16 00 00 48 8b 32 48 8d 7e 01 8b 89 fc 15 00 00 48 39 cf 73 08 48 89 3a <48> 89 44 f2 08 c3 0f 1f 80 00 00 00 00 48 8b 04 24 65 48 8b 15 c4
RSP: 0018:ffffc9000505f900 EFLAGS: 00000283
RAX: ffffffff8407a78b RBX: 0000000000000001 RCX: 0000000000080000
RDX: ffffc9000d731000 RSI: 000000000000f5f6 RDI: 000000000000f5f7
RBP: 0000000000000000 R08: dffffc0000000000 R09: ffffed100978803f
R10: ffffed100978803f R11: 1ffff1100978803e R12: 00007fffffffefff
R13: ffff88804bc401f0 R14: ffff88804bc401f0 R15: 0000000000000000
_copy_from_user+0x10b/0x170 lib/usercopy.c:26
copy_from_user include/linux/uaccess.h:161 [inline]
snd_rawmidi_kernel_write1+0x353/0x590 sound/core/rawmidi.c:1549
snd_rawmidi_write+0x568/0xb00 sound/core/rawmidi.c:1618
do_loop_readv_writev fs/read_write.c:-1 [inline]
do_iter_write+0x497/0xaf0 fs/read_write.c:863
vfs_writev fs/read_write.c:934 [inline]
do_writev+0x24e/0x410 fs/read_write.c:977
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: 0033:0x7fd0c1d8e969
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:00007fd0c2c65038 EFLAGS: 00000246 ORIG_RAX: 0000000000000014
RAX: ffffffffffffffda RBX: 00007fd0c1fb5fa0 RCX: 00007fd0c1d8e969
RDX: 0000000000000002 RSI: 0000200000000840 RDI: 0000000000000004
RBP: 00007fd0c1e10ab1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fd0c1fb5fa0 R15: 00007fff5a7b15e8
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:llc_conn_state_process+0xcba/0x1290 net/llc/llc_conn.c:-1
Code: 84 db 0f 94 c0 4d 8b 36 8d 54 00 01 b8 01 00 00 00 bd 07 00 00 00 0f 44 e8 4c 89 f0 48 c1 e8 03 48 bb 00 00 00 00 00 fc ff df <0f> b6 04 18 84 c0 0f 85 7e 05 00 00 41 89 16 41 0f b6 04 1c 84 c0
RSP: 0018:ffffc900001e0aa8 EFLAGS: 00010246
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: 0000000000000100
RDX: 0000000000000001 RSI: 0000000000000002 RDI: 0000000000000000
RBP: 0000000000000007 R08: ffff88801c3a3b80 R09: 0000000000000005
R10: 0000000000000005 R11: 0000000000000100 R12: 1ffff1100b42d002
R13: ffff88805a168000 R14: 0000000000000000 R15: ffff88805a168012
FS: 00007fd0c2c656c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055557c6e2808 CR3: 0000000028b91000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
0: 84 db test %bl,%bl
2: 0f 94 c0 sete %al
5: 4d 8b 36 mov (%r14),%r14
8: 8d 54 00 01 lea 0x1(%rax,%rax,1),%edx
c: b8 01 00 00 00 mov $0x1,%eax
11: bd 07 00 00 00 mov $0x7,%ebp
16: 0f 44 e8 cmove %eax,%ebp
19: 4c 89 f0 mov %r14,%rax
1c: 48 c1 e8 03 shr $0x3,%rax
20: 48 bb 00 00 00 00 00 movabs $0xdffffc0000000000,%rbx
27: fc ff df
* 2a: 0f b6 04 18 movzbl (%rax,%rbx,1),%eax <-- trapping instruction
2e: 84 c0 test %al,%al
30: 0f 85 7e 05 00 00 jne 0x5b4
36: 41 89 16 mov %edx,(%r14)
39: 41 0f b6 04 1c movzbl (%r12,%rbx,1),%eax
3e: 84 c0 test %al,%al