Oops: general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] SMP KASAN PTI
KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
CPU: 0 UID: 0 PID: 5883 Comm: kworker/0:5 Tainted: G U L syzkaller #0 PREEMPT(full)
Tainted: [U]=USER, [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
Workqueue: events vidtv_mux_tick
RIP: 0010:vidtv_psi_ts_psi_write_into+0x54a/0xbc0 drivers/media/test-drivers/vidtv/vidtv_psi.c:197
Code: 6c 61 dd f9 4c 8d 63 20 4c 89 e0 48 c1 e8 03 80 3c 28 00 0f 85 e8 04 00 00 48 8b 43 20 48 89 c2 48 89 c1 48 c1 ea 03 83 e1 07 <0f> b6 14 2a 38 ca 7f 08 84 d2 0f 85 19 05 00 00 0f b6 10 48 8b 7c
RSP: 0018:ffffc900042d73f8 EFLAGS: 00010202
RAX: 0000000000000002 RBX: ffffc900042d7678 RCX: 0000000000000002
RDX: 0000000000000000 RSI: ffffffff882a97b4 RDI: ffff88805b0f1e40
RBP: dffffc0000000000 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffffc900042d7698
R13: 0000000000000178 R14: 0000000000000000 R15: 0000000000000008
FS: 0000000000000000(0000) GS:ffff888124354000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fbd9f7f8ff8 CR3: 00000000475fa000 CR4: 00000000003526f0
Call Trace:
<TASK>
vidtv_psi_table_header_write_into drivers/media/test-drivers/vidtv/vidtv_psi.c:799 [inline]
vidtv_psi_pmt_write_into+0x3b2/0xa70 drivers/media/test-drivers/vidtv/vidtv_psi.c:1231
vidtv_mux_push_si+0x932/0xe80 drivers/media/test-drivers/vidtv/vidtv_mux.c:196
vidtv_mux_tick+0xe9b/0x1480 drivers/media/test-drivers/vidtv/vidtv_mux.c:408
process_one_work+0x9d7/0x1920 kernel/workqueue.c:3275
process_scheduled_works kernel/workqueue.c:3358 [inline]
worker_thread+0x5da/0xe40 kernel/workqueue.c:3439
kthread+0x370/0x450 kernel/kthread.c:467
ret_from_fork+0x754/0xd80 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:vidtv_psi_ts_psi_write_into+0x54a/0xbc0 drivers/media/test-drivers/vidtv/vidtv_psi.c:197
Code: 6c 61 dd f9 4c 8d 63 20 4c 89 e0 48 c1 e8 03 80 3c 28 00 0f 85 e8 04 00 00 48 8b 43 20 48 89 c2 48 89 c1 48 c1 ea 03 83 e1 07 <0f> b6 14 2a 38 ca 7f 08 84 d2 0f 85 19 05 00 00 0f b6 10 48 8b 7c
RSP: 0018:ffffc900042d73f8 EFLAGS: 00010202
RAX: 0000000000000002 RBX: ffffc900042d7678 RCX: 0000000000000002
RDX: 0000000000000000 RSI: ffffffff882a97b4 RDI: ffff88805b0f1e40
RBP: dffffc0000000000 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffffc900042d7698
R13: 0000000000000178 R14: 0000000000000000 R15: 0000000000000008
FS: 0000000000000000(0000) GS:ffff888124354000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fc5ca1e7198 CR3: 0000000046b76000 CR4: 00000000003526f0
----------------
Code disassembly (best guess), 3 bytes skipped:
0: f9 stc
1: 4c 8d 63 20 lea 0x20(%rbx),%r12
5: 4c 89 e0 mov %r12,%rax
8: 48 c1 e8 03 shr $0x3,%rax
c: 80 3c 28 00 cmpb $0x0,(%rax,%rbp,1)
10: 0f 85 e8 04 00 00 jne 0x4fe
16: 48 8b 43 20 mov 0x20(%rbx),%rax
1a: 48 89 c2 mov %rax,%rdx
1d: 48 89 c1 mov %rax,%rcx
20: 48 c1 ea 03 shr $0x3,%rdx
24: 83 e1 07 and $0x7,%ecx
* 27: 0f b6 14 2a movzbl (%rdx,%rbp,1),%edx <-- trapping instruction
2b: 38 ca cmp %cl,%dl
2d: 7f 08 jg 0x37
2f: 84 d2 test %dl,%dl
31: 0f 85 19 05 00 00 jne 0x550
37: 0f b6 10 movzbl (%rax),%edx
3a: 48 rex.W
3b: 8b .byte 0x8b
3c: 7c .byte 0x7c