BUG: unable to handle page fault for address: ffffffffffffffff #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page PGD e59b067 P4D e59b067 PUD e59d067 PMD 0 Oops: Oops: 0000 [#1] SMP KASAN NOPTI CPU: 2 UID: 0 PID: 12559 Comm: syz.2.1940 Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 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 e3 1b fa 4c 89 ea 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 80 3c 02 00 0f 85 75 02 00 00 <49> 8b 7d 00 e8 7c a5 04 fa 31 ff 89 c3 89 c6 e8 71 dd 1b fa 84 db RSP: 0018:ffffc900039a78d0 EFLAGS: 00010246 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffc90031e01000 RDX: 1fffffffffffffff RSI: ffffffff87ecfdf0 RDI: ffff88802ddbfe18 RBP: ffff88802ddbfe00 R08: 0000000000000001 R09: fffffbfff1fd9ee1 R10: ffffffff8fecf70f R11: 0000000000000000 R12: ffff8880373d7dc0 R13: ffffffffffffffff R14: ffff88802ec787f8 R15: ffff8880373d7e08 FS: 00007f8ef5e636c0(0000) GS:ffff8880d653f000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffffffffff CR3: 000000003fecc000 CR4: 0000000000352ef0 Call Trace: chrdev_open+0x234/0x6a0 fs/char_dev.c:411 do_dentry_open+0x6d8/0x1660 fs/open.c:949 vfs_open+0x82/0x3f0 fs/open.c:1081 do_open fs/namei.c:4671 [inline] path_openat+0x208c/0x31a0 fs/namei.c:4830 do_file_open+0x20e/0x430 fs/namei.c:4859 do_sys_openat2+0x10d/0x1e0 fs/open.c:1366 do_sys_open fs/open.c:1372 [inline] __do_sys_openat fs/open.c:1388 [inline] __se_sys_openat fs/open.c:1383 [inline] __x64_sys_openat+0x12d/0x210 fs/open.c:1383 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x106/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f8ef4f5cfce Code: 08 0f 85 a5 a8 ff ff 49 89 fb 48 89 f0 48 89 d7 48 89 ce 4c 89 c2 4d 89 ca 4c 8b 44 24 08 4c 8b 4c 24 10 4c 89 5c 24 08 0f 05 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 80 00 00 00 00 48 83 ec 08 RSP: 002b:00007f8ef5e62b28 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007f8ef5e636c0 RCX: 00007f8ef4f5cfce RDX: 0000000000040002 RSI: 00007f8ef5e62c00 RDI: ffffffffffffff9c RBP: 00007f8ef5e62c00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: cccccccccccccccd R13: 00007f8ef5216038 R14: 00007f8ef5215fa0 R15: 00007ffcf9b7d068 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 e3 1b fa 4c 89 ea 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 80 3c 02 00 0f 85 75 02 00 00 <49> 8b 7d 00 e8 7c a5 04 fa 31 ff 89 c3 89 c6 e8 71 dd 1b fa 84 db RSP: 0018:ffffc900039a78d0 EFLAGS: 00010246 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffc90031e01000 RDX: 1fffffffffffffff RSI: ffffffff87ecfdf0 RDI: ffff88802ddbfe18 RBP: ffff88802ddbfe00 R08: 0000000000000001 R09: fffffbfff1fd9ee1 R10: ffffffff8fecf70f R11: 0000000000000000 R12: ffff8880373d7dc0 R13: ffffffffffffffff R14: ffff88802ec787f8 R15: ffff8880373d7e08 FS: 00007f8ef5e636c0(0000) GS:ffff8880d653f000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffffffffff CR3: 000000003fecc000 CR4: 0000000000352ef0 ---------------- 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 e3 1b fa call 0xfa1be35f 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 75 02 00 00 jne 0x29f * 2a: 49 8b 7d 00 mov 0x0(%r13),%rdi <-- trapping instruction 2e: e8 7c a5 04 fa call 0xfa04a5af 33: 31 ff xor %edi,%edi 35: 89 c3 mov %eax,%ebx 37: 89 c6 mov %eax,%esi 39: e8 71 dd 1b fa call 0xfa1bddaf 3e: 84 db test %bl,%bl