BUG: kernel NULL pointer dereference, address: 0000000000000649
#PF: supervisor write access in kernel mode
#PF: error_code(0x0002) - not-present page
PGD 0 P4D 0
Oops: Oops: 0002 [#1] SMP KASAN PTI
CPU: 1 UID: 0 PID: 16148 Comm: syz-executor Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:llc_ui_setsockopt+0x4e1/0x5f0 net/llc/af_llc.c:-1
Code: a1 f8 eb 4b e8 c0 dc 3d f8 4c 6b f3 64 49 8d 9f a0 06 00 00 48 89 d8 48 c1 e8 03 42 80 3c 28 00 74 08 48 89 df e8 df 46 a1 f8 <4c> 89 33 eb 23 e8 95 dc 3d f8 4d 8d b7 0d 07 00 00 4c 89 f0 48 c1
RSP: 0018:ffffc90000a08b98 EFLAGS: 00010246
RAX: 00000000000000c9 RBX: 0000000000000649 RCX: ffff8880295bbc00
RDX: 0000000000000100 RSI: ffffffff8be33660 RDI: ffff888058cecc10
RBP: ffffc90000a08c90 R08: ffffffff8fa38437 R09: 1ffffffff1f47086
R10: dffffc0000000000 R11: ffffffff8981cd90 R12: 1ffff92000141178
R13: ffff888058cecc10 R14: 0000000000000001 R15: 0000000000000001
FS: 0000555587d1f500(0000) GS:ffff888125d1b000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000649 CR3: 0000000031064000 CR4: 00000000003526f0
Call Trace:
expire_timers kernel/time/timer.c:1798 [inline]
__run_timers kernel/time/timer.c:2372 [inline]
__run_timer_base+0x61a/0x860 kernel/time/timer.c:2384
run_timer_base kernel/time/timer.c:2393 [inline]
run_timer_softirq+0xb7/0x180 kernel/time/timer.c:2403
handle_softirqs+0x283/0x870 kernel/softirq.c:579
__do_softirq kernel/softirq.c:613 [inline]
invoke_softirq kernel/softirq.c:453 [inline]
__irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680
irq_exit_rcu+0x9/0x30 kernel/softirq.c:696
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline]
sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1050
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:console_flush_all+0x7f7/0xc40 kernel/printk/printk.c:3227
Code: 48 21 c3 0f 85 e9 01 00 00 e8 15 49 1f 00 48 8b 5c 24 20 4d 85 f6 75 07 e8 06 49 1f 00 eb 06 e8 ff 48 1f 00 fb 48 8b 44 24 28 <42> 80 3c 20 00 74 08 48 89 df e8 3a b2 82 00 48 8b 1b 48 8b 44 24
RSP: 0018:ffffc9001ad0e940 EFLAGS: 00000293
RAX: 1ffffffff1d367d7 RBX: ffffffff8e9b3eb8 RCX: ffff8880295bbc00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc9001ad0ea90 R08: ffffffff8fa38437 R09: 1ffffffff1f47086
R10: dffffc0000000000 R11: fffffbfff1f47087 R12: dffffc0000000000
R13: 0000000000000001 R14: 0000000000000200 R15: ffffffff8e9b3e60
__console_flush_and_unlock kernel/printk/printk.c:3285 [inline]
console_unlock+0xc4/0x270 kernel/printk/printk.c:3325
vprintk_emit+0x5b7/0x7a0 kernel/printk/printk.c:2450
_printk+0xcf/0x120 kernel/printk/printk.c:2475
batadv_hardif_enable_interface+0x7c0/0xa10 net/batman-adv/hard-interface.c:750
batadv_meshif_slave_add+0x79/0x100 net/batman-adv/mesh-interface.c:845
do_set_master+0x530/0x6d0 net/core/rtnetlink.c:2948
do_setlink+0xcf0/0x41c0 net/core/rtnetlink.c:3150
rtnl_changelink net/core/rtnetlink.c:3761 [inline]
__rtnl_newlink net/core/rtnetlink.c:3920 [inline]
rtnl_newlink+0x160b/0x1c70 net/core/rtnetlink.c:4057
rtnetlink_rcv_msg+0x7cc/0xb70 net/core/rtnetlink.c:6946
netlink_rcv_skb+0x208/0x470 net/netlink/af_netlink.c:2552
netlink_unicast_kernel net/netlink/af_netlink.c:1320 [inline]
netlink_unicast+0x82c/0x9e0 net/netlink/af_netlink.c:1346
netlink_sendmsg+0x805/0xb30 net/netlink/af_netlink.c:1896
sock_sendmsg_nosec net/socket.c:714 [inline]
__sock_sendmsg+0x21c/0x270 net/socket.c:729
__sys_sendto+0x3bd/0x520 net/socket.c:2228
__do_sys_sendto net/socket.c:2235 [inline]
__se_sys_sendto net/socket.c:2231 [inline]
__x64_sys_sendto+0xde/0x100 net/socket.c:2231
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f9b4ab90a7c
Code: 2a 5f 02 00 44 8b 4c 24 2c 4c 8b 44 24 20 89 c5 44 8b 54 24 28 48 8b 54 24 18 b8 2c 00 00 00 48 8b 74 24 10 8b 7c 24 08 0f 05 <48> 3d 00 f0 ff ff 77 34 89 ef 48 89 44 24 08 e8 70 5f 02 00 48 8b
RSP: 002b:00007ffc529aeb10 EFLAGS: 00000293 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 00007f9b4b8e4620 RCX: 00007f9b4ab90a7c
RDX: 0000000000000028 RSI: 00007f9b4b8e4670 RDI: 0000000000000003
RBP: 0000000000000000 R08: 00007ffc529aeb64 R09: 000000000000000c
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000003
R13: 0000000000000000 R14: 00007f9b4b8e4670 R15: 0000000000000000
Modules linked in:
CR2: 0000000000000649
---[ end trace 0000000000000000 ]---
RIP: 0010:llc_ui_setsockopt+0x4e1/0x5f0 net/llc/af_llc.c:-1
Code: a1 f8 eb 4b e8 c0 dc 3d f8 4c 6b f3 64 49 8d 9f a0 06 00 00 48 89 d8 48 c1 e8 03 42 80 3c 28 00 74 08 48 89 df e8 df 46 a1 f8 <4c> 89 33 eb 23 e8 95 dc 3d f8 4d 8d b7 0d 07 00 00 4c 89 f0 48 c1
RSP: 0018:ffffc90000a08b98 EFLAGS: 00010246
RAX: 00000000000000c9 RBX: 0000000000000649 RCX: ffff8880295bbc00
RDX: 0000000000000100 RSI: ffffffff8be33660 RDI: ffff888058cecc10
RBP: ffffc90000a08c90 R08: ffffffff8fa38437 R09: 1ffffffff1f47086
R10: dffffc0000000000 R11: ffffffff8981cd90 R12: 1ffff92000141178
R13: ffff888058cecc10 R14: 0000000000000001 R15: 0000000000000001
FS: 0000555587d1f500(0000) GS:ffff888125d1b000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000649 CR3: 0000000031064000 CR4: 00000000003526f0
----------------
Code disassembly (best guess):
0: a1 f8 eb 4b e8 c0 dc movabs 0xf83ddcc0e84bebf8,%eax
7: 3d f8
9: 4c 6b f3 64 imul $0x64,%rbx,%r14
d: 49 8d 9f a0 06 00 00 lea 0x6a0(%r15),%rbx
14: 48 89 d8 mov %rbx,%rax
17: 48 c1 e8 03 shr $0x3,%rax
1b: 42 80 3c 28 00 cmpb $0x0,(%rax,%r13,1)
20: 74 08 je 0x2a
22: 48 89 df mov %rbx,%rdi
25: e8 df 46 a1 f8 call 0xf8a14709
* 2a: 4c 89 33 mov %r14,(%rbx) <-- trapping instruction
2d: eb 23 jmp 0x52
2f: e8 95 dc 3d f8 call 0xf83ddcc9
34: 4d 8d b7 0d 07 00 00 lea 0x70d(%r15),%r14
3b: 4c 89 f0 mov %r14,%rax
3e: 48 rex.W
3f: c1 .byte 0xc1