Oops: general protection fault, probably for non-canonical address 0xdffffc000000003f: 0000 [#1] SMP KASAN PTI
KASAN: null-ptr-deref in range [0x00000000000001f8-0x00000000000001ff]
CPU: 0 UID: 0 PID: 10 Comm: kworker/0:1 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
Workqueue: infiniband ib_cache_event_task
RIP: 0010:__ethtool_get_link_ksettings+0x6e/0x170 net/ethtool/ioctl.c:444
Code: 02 00 00 4c 89 fd 48 c1 ed 03 42 80 7c 2d 00 00 74 08 4c 89 ff e8 62 75 6f f8 41 bc f8 01 00 00 4d 03 27 4c 89 e0 48 c1 e8 03 <42> 80 3c 28 00 74 08 4c 89 e7 e8 43 75 6f f8 49 83 3c 24 00 74 4e
RSP: 0018:ffffc900000f7708 EFLAGS: 00010206
RAX: 000000000000003f RBX: ffffc900000f7780 RCX: ffff88801d6fbd80
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: 1ffff1100fd5685e R08: ffffffff8fdcf8a7 R09: 1ffffffff1fb9f14
R10: dffffc0000000000 R11: fffffbfff1fb9f15 R12: 00000000000001f8
R13: dffffc0000000000 R14: ffff88807eab4000 R15: ffff88807eab42f0
FS:  0000000000000000(0000) GS:ffff88812528d000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c36c089 CR3: 000000007aff2000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 ib_get_eth_speed+0x180/0x7f0 drivers/infiniband/core/verbs.c:2055
 rxe_query_port+0x93/0x3d0 drivers/infiniband/sw/rxe/rxe_verbs.c:62
 __ib_query_port drivers/infiniband/core/device.c:2121 [inline]
 ib_query_port+0x170/0x830 drivers/infiniband/core/device.c:2153
 ib_cache_update+0x1ba/0xc70 drivers/infiniband/core/cache.c:1456
 ib_cache_event_task+0xe0/0x1d0 drivers/infiniband/core/cache.c:1535
 process_one_work kernel/workqueue.c:3302 [inline]
 process_scheduled_works+0xb5d/0x1860 kernel/workqueue.c:3385
 worker_thread+0xa53/0xfc0 kernel/workqueue.c:3466
 kthread+0x388/0x470 kernel/kthread.c:436
 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:__ethtool_get_link_ksettings+0x6e/0x170 net/ethtool/ioctl.c:444
Code: 02 00 00 4c 89 fd 48 c1 ed 03 42 80 7c 2d 00 00 74 08 4c 89 ff e8 62 75 6f f8 41 bc f8 01 00 00 4d 03 27 4c 89 e0 48 c1 e8 03 <42> 80 3c 28 00 74 08 4c 89 e7 e8 43 75 6f f8 49 83 3c 24 00 74 4e
RSP: 0018:ffffc900000f7708 EFLAGS: 00010206
RAX: 000000000000003f RBX: ffffc900000f7780 RCX: ffff88801d6fbd80
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: 1ffff1100fd5685e R08: ffffffff8fdcf8a7 R09: 1ffffffff1fb9f14
R10: dffffc0000000000 R11: fffffbfff1fb9f15 R12: 00000000000001f8
R13: dffffc0000000000 R14: ffff88807eab4000 R15: ffff88807eab42f0
FS:  0000000000000000(0000) GS:ffff88812528d000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f68a01ea4c0 CR3: 0000000078b70000 CR4: 00000000003526f0
----------------
Code disassembly (best guess):
   0:	02 00                	add    (%rax),%al
   2:	00 4c 89 fd          	add    %cl,-0x3(%rcx,%rcx,4)
   6:	48 c1 ed 03          	shr    $0x3,%rbp
   a:	42 80 7c 2d 00 00    	cmpb   $0x0,0x0(%rbp,%r13,1)
  10:	74 08                	je     0x1a
  12:	4c 89 ff             	mov    %r15,%rdi
  15:	e8 62 75 6f f8       	call   0xf86f757c
  1a:	41 bc f8 01 00 00    	mov    $0x1f8,%r12d
  20:	4d 03 27             	add    (%r15),%r12
  23:	4c 89 e0             	mov    %r12,%rax
  26:	48 c1 e8 03          	shr    $0x3,%rax
* 2a:	42 80 3c 28 00       	cmpb   $0x0,(%rax,%r13,1) <-- trapping instruction
  2f:	74 08                	je     0x39
  31:	4c 89 e7             	mov    %r12,%rdi
  34:	e8 43 75 6f f8       	call   0xf86f757c
  39:	49 83 3c 24 00       	cmpq   $0x0,(%r12)
  3e:	74 4e                	je     0x8e