Oops: general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] SMP KASAN PTI
KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
CPU: 1 UID: 0 PID: 14490 Comm: syz.4.1553 Not tainted 6.16.0-rc6-next-20250716-syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:llc_conn_state_process+0xd09/0x1360 net/llc/llc_conn.c:-1
Code: 4c 89 f7 e8 19 b6 a7 f8 31 c0 84 db 0f 94 c0 4d 8b 36 8d 5c 00 01 b8 01 00 00 00 bd 07 00 00 00 0f 44 e8 4c 89 f0 48 c1 e8 03 <42> 0f b6 04 28 84 c0 0f 85 0e 06 00 00 41 89 1e 43 0f b6 04 2c 84
RSP: 0018:ffffc90000a08ad0 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000001 RCX: 0000000000000100
RDX: ffff8880342cbc00 RSI: 0000000000000002 RDI: 0000000000000000
RBP: 0000000000000007 R08: ffff8880342cbc00 R09: 0000000000000005
R10: 0000000000000005 R11: 0000000000000100 R12: 1ffff11004f7c602
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff888027be3012
FS: 00007f35e9df66c0(0000) GS:ffff888125ce2000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c33e223 CR3: 0000000055b0a000 CR4: 00000000003526f0
Call Trace:
llc_process_tmr_ev net/llc/llc_c_ac.c:1448 [inline]
llc_conn_tmr_common_cb+0x34a/0x830 net/llc/llc_c_ac.c:1331
call_timer_fn+0x17e/0x5f0 kernel/time/timer.c:1747
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+0x286/0x870 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:check_kcov_mode kernel/kcov.c:194 [inline]
RIP: 0010:write_comp_data kernel/kcov.c:246 [inline]
RIP: 0010:__sanitizer_cov_trace_const_cmp4+0x37/0x90 kernel/kcov.c:314
Code: 08 e0 a3 92 65 8b 0d 08 35 e4 10 81 e1 00 01 ff 00 74 11 81 f9 00 01 00 00 75 5b 83 ba 3c 16 00 00 00 74 52 8b 8a 18 16 00 00 <83> f9 03 75 47 48 8b 8a 20 16 00 00 44 8b 8a 1c 16 00 00 49 c1 e1
RSP: 0018:ffffc90004b1f5d8 EFLAGS: 00000246
RAX: ffffffff81f812aa RBX: ffffea00014595c0 RCX: 0000000000000002
RDX: ffff8880342cbc00 RSI: 0000000000000001 RDI: 0000000000000000
RBP: 0000000000000001 R08: ffffea00014595c7 R09: 1ffffd400028b2b8
R10: dffffc0000000000 R11: fffff9400028b2b9 R12: ffff88807bea2af0
R13: 1ffff92000963ef4 R14: ffffc90004b1f7a0 R15: ffff88806e889340
xa_entry include/linux/xarray.h:1226 [inline]
xas_reload+0x1aa/0x470 include/linux/xarray.h:1630
next_uptodate_folio+0x15f/0x5d0 mm/filemap.c:3621
filemap_map_pages+0x21d/0x1740 mm/filemap.c:3759
do_fault_around mm/memory.c:5537 [inline]
do_read_fault mm/memory.c:5570 [inline]
do_fault mm/memory.c:5713 [inline]
do_pte_missing mm/memory.c:4240 [inline]
handle_pte_fault mm/memory.c:6058 [inline]
__handle_mm_fault+0x34ac/0x5440 mm/memory.c:6201
handle_mm_fault+0x40a/0x8e0 mm/memory.c:6370
faultin_page mm/gup.c:1144 [inline]
__get_user_pages+0x1699/0x2ce0 mm/gup.c:1446
populate_vma_page_range+0x29f/0x3a0 mm/gup.c:1880
__mm_populate+0x24c/0x380 mm/gup.c:1983
mm_populate include/linux/mm.h:3365 [inline]
vm_mmap_pgoff+0x387/0x4d0 mm/util.c:584
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: 0033:0x7f35ebf8e929
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:00007f35e9df6038 EFLAGS: 00000246 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 00007f35ec1b5fa0 RCX: 00007f35ebf8e929
RDX: b635773f06ebbeee RSI: 0000000000b36000 RDI: 0000200000000000
RBP: 00007f35ec010ca1 R08: ffffffffffffffff R09: 0000000000000000
R10: 0000000000008031 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f35ec1b5fa0 R15: 00007ffe602d0c08
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:llc_conn_state_process+0xd09/0x1360 net/llc/llc_conn.c:-1
Code: 4c 89 f7 e8 19 b6 a7 f8 31 c0 84 db 0f 94 c0 4d 8b 36 8d 5c 00 01 b8 01 00 00 00 bd 07 00 00 00 0f 44 e8 4c 89 f0 48 c1 e8 03 <42> 0f b6 04 28 84 c0 0f 85 0e 06 00 00 41 89 1e 43 0f b6 04 2c 84
RSP: 0018:ffffc90000a08ad0 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000001 RCX: 0000000000000100
RDX: ffff8880342cbc00 RSI: 0000000000000002 RDI: 0000000000000000
RBP: 0000000000000007 R08: ffff8880342cbc00 R09: 0000000000000005
R10: 0000000000000005 R11: 0000000000000100 R12: 1ffff11004f7c602
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff888027be3012
FS: 00007f35e9df66c0(0000) GS:ffff888125ce2000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c33e223 CR3: 0000000055b0a000 CR4: 00000000003526f0
----------------
Code disassembly (best guess):
0: 4c 89 f7 mov %r14,%rdi
3: e8 19 b6 a7 f8 call 0xf8a7b621
8: 31 c0 xor %eax,%eax
a: 84 db test %bl,%bl
c: 0f 94 c0 sete %al
f: 4d 8b 36 mov (%r14),%r14
12: 8d 5c 00 01 lea 0x1(%rax,%rax,1),%ebx
16: b8 01 00 00 00 mov $0x1,%eax
1b: bd 07 00 00 00 mov $0x7,%ebp
20: 0f 44 e8 cmove %eax,%ebp
23: 4c 89 f0 mov %r14,%rax
26: 48 c1 e8 03 shr $0x3,%rax
* 2a: 42 0f b6 04 28 movzbl (%rax,%r13,1),%eax <-- trapping instruction
2f: 84 c0 test %al,%al
31: 0f 85 0e 06 00 00 jne 0x645
37: 41 89 1e mov %ebx,(%r14)
3a: 43 0f b6 04 2c movzbl (%r12,%r13,1),%eax
3f: 84 .byte 0x84