BUG: unable to handle page fault for address: ffffffffffffffff #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page PGD e385067 P4D e385067 PUD e387067 PMD 0 Oops: Oops: 0000 [#1] SMP KASAN PTI CPU: 0 UID: 0 PID: 4135 Comm: syz.6.6001 Tainted: G U syzkaller #0 PREEMPT(full) Tainted: [U]=USER Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 RIP: 0010:dvb_device_open+0x11b/0x3b0 drivers/media/dvb-core/dvbdev.c:103 Code: 18 4d 85 ed 0f 84 0e 02 00 00 e8 50 6d d8 f9 4c 89 ea 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 80 3c 02 00 0f 85 3d 02 00 00 <49> 8b 7d 00 e8 ec 18 c2 f9 31 ff 89 c3 89 c6 e8 01 68 d8 f9 84 db RSP: 0018:ffffc90005217930 EFLAGS: 00010246 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffc9001b7e1000 RDX: 1fffffffffffffff RSI: ffffffff87e29b50 RDI: ffff88802a62ac18 RBP: ffff88802a62ac00 R08: 0000000000000001 R09: fffffbfff1f89ed5 R10: ffffffff8fc4f6af R11: 0000000000000000 R12: ffff888078ca5dc0 R13: ffffffffffffffff R14: ffff88802aabb5c0 R15: ffff888078ca5e08 FS: 00007f7e40c186c0(0000) GS:ffff8881246c0000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffffffffff CR3: 000000008dd4e000 CR4: 00000000003526f0 Call Trace: chrdev_open+0x234/0x6a0 fs/char_dev.c:414 do_dentry_open+0x982/0x1530 fs/open.c:965 vfs_open+0x82/0x3f0 fs/open.c:1095 do_open fs/namei.c:3887 [inline] path_openat+0x1de4/0x2cb0 fs/namei.c:4046 do_filp_open+0x20b/0x470 fs/namei.c:4073 do_sys_openat2+0x11b/0x1d0 fs/open.c:1435 do_sys_open fs/open.c:1450 [inline] __do_sys_openat fs/open.c:1466 [inline] __se_sys_openat fs/open.c:1461 [inline] __x64_sys_openat+0x174/0x210 fs/open.c:1461 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x490 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f7e3fd8ebe9 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:00007f7e40c18038 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007f7e3ffc6270 RCX: 00007f7e3fd8ebe9 RDX: 0000000000000001 RSI: 0000200000000000 RDI: ffffffffffffff9c RBP: 00007f7e3fe11e19 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f7e3ffc6308 R14: 00007f7e3ffc6270 R15: 00007fff5311b908 Modules linked in: CR2: ffffffffffffffff ---[ end trace 0000000000000000 ]--- RIP: 0010:dvb_device_open+0x11b/0x3b0 drivers/media/dvb-core/dvbdev.c:103 Code: 18 4d 85 ed 0f 84 0e 02 00 00 e8 50 6d d8 f9 4c 89 ea 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 80 3c 02 00 0f 85 3d 02 00 00 <49> 8b 7d 00 e8 ec 18 c2 f9 31 ff 89 c3 89 c6 e8 01 68 d8 f9 84 db RSP: 0018:ffffc90005217930 EFLAGS: 00010246 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffc9001b7e1000 RDX: 1fffffffffffffff RSI: ffffffff87e29b50 RDI: ffff88802a62ac18 RBP: ffff88802a62ac00 R08: 0000000000000001 R09: fffffbfff1f89ed5 R10: ffffffff8fc4f6af R11: 0000000000000000 R12: ffff888078ca5dc0 R13: ffffffffffffffff R14: ffff88802aabb5c0 R15: ffff888078ca5e08 FS: 00007f7e40c186c0(0000) GS:ffff8881246c0000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffffffffff CR3: 000000008dd4e000 CR4: 00000000003526f0 ---------------- Code disassembly (best guess): 0: 18 4d 85 sbb %cl,-0x7b(%rbp) 3: ed in (%dx),%eax 4: 0f 84 0e 02 00 00 je 0x218 a: e8 50 6d d8 f9 call 0xf9d86d5f f: 4c 89 ea mov %r13,%rdx 12: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 19: fc ff df 1c: 48 c1 ea 03 shr $0x3,%rdx 20: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) 24: 0f 85 3d 02 00 00 jne 0x267 * 2a: 49 8b 7d 00 mov 0x0(%r13),%rdi <-- trapping instruction 2e: e8 ec 18 c2 f9 call 0xf9c2191f 33: 31 ff xor %edi,%edi 35: 89 c3 mov %eax,%ebx 37: 89 c6 mov %eax,%esi 39: e8 01 68 d8 f9 call 0xf9d8683f 3e: 84 db test %bl,%bl