general protection fault, probably for non-canonical address 0xdffffc0000000003: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000018-0x000000000000001f] CPU: 0 PID: 4534 Comm: kworker/0:19 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 Workqueue: kafsd afs_process_async_call RIP: 0010:rxrpc_kernel_get_srtt+0x28/0x100 net/rxrpc/peer_object.c:518 Code: 00 00 55 41 57 41 56 41 54 53 48 89 d3 49 89 f6 49 bc 00 00 00 00 00 fc ff df e8 c3 43 72 f8 49 83 c6 18 4c 89 f0 48 c1 e8 03 <42> 80 3c 20 00 74 08 4c 89 f7 e8 79 71 b7 f8 4d 8b 36 4d 8d be 98 RSP: 0018:ffffc90003c07a10 EFLAGS: 00010206 RAX: 0000000000000003 RBX: ffffc90003c07aa0 RCX: ffff8880763f9dc0 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff88807457bc00 RBP: ffffc90003c07b10 R08: ffff88801bffd01f R09: 1ffff110037ffa03 R10: dffffc0000000000 R11: ffffed10037ffa04 R12: dffffc0000000000 R13: ffff88807457bc00 R14: 0000000000000018 R15: ffff88802b1ad0f0 FS: 0000000000000000(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000056131a525630 CR3: 000000007ea05000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: afs_vlserver_probe_result+0x5fd/0xaa0 fs/afs/vl_probe.c:118 afs_deliver_to_call+0xc13/0x1100 fs/afs/rxrpc.c:562 afs_process_async_call+0x7e/0xe0 fs/afs/rxrpc.c:702 process_one_work+0x867/0xff0 kernel/workqueue.c:2310 worker_thread+0xad7/0x12a0 kernel/workqueue.c:2457 kthread+0x42e/0x520 kernel/kthread.c:334 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287 Modules linked in: ---[ end trace c20595db38ec3393 ]--- RIP: 0010:rxrpc_kernel_get_srtt+0x28/0x100 net/rxrpc/peer_object.c:518 Code: 00 00 55 41 57 41 56 41 54 53 48 89 d3 49 89 f6 49 bc 00 00 00 00 00 fc ff df e8 c3 43 72 f8 49 83 c6 18 4c 89 f0 48 c1 e8 03 <42> 80 3c 20 00 74 08 4c 89 f7 e8 79 71 b7 f8 4d 8b 36 4d 8d be 98 RSP: 0018:ffffc90003c07a10 EFLAGS: 00010206 RAX: 0000000000000003 RBX: ffffc90003c07aa0 RCX: ffff8880763f9dc0 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff88807457bc00 RBP: ffffc90003c07b10 R08: ffff88801bffd01f R09: 1ffff110037ffa03 R10: dffffc0000000000 R11: ffffed10037ffa04 R12: dffffc0000000000 R13: ffff88807457bc00 R14: 0000000000000018 R15: ffff88802b1ad0f0 FS: 0000000000000000(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000056131a525630 CR3: 000000007ea05000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 00 00 add %al,(%rax) 2: 55 push %rbp 3: 41 57 push %r15 5: 41 56 push %r14 7: 41 54 push %r12 9: 53 push %rbx a: 48 89 d3 mov %rdx,%rbx d: 49 89 f6 mov %rsi,%r14 10: 49 bc 00 00 00 00 00 movabs $0xdffffc0000000000,%r12 17: fc ff df 1a: e8 c3 43 72 f8 call 0xf87243e2 1f: 49 83 c6 18 add $0x18,%r14 23: 4c 89 f0 mov %r14,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 42 80 3c 20 00 cmpb $0x0,(%rax,%r12,1) <-- trapping instruction 2f: 74 08 je 0x39 31: 4c 89 f7 mov %r14,%rdi 34: e8 79 71 b7 f8 call 0xf8b771b2 39: 4d 8b 36 mov (%r14),%r14 3c: 4d rex.WRB 3d: 8d .byte 0x8d 3e: be .byte 0xbe 3f: 98 cwtl