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Message-ID: <69539037.050a0220.329c0f.052f.GAE@google.com> Date: Tue, 30 Dec 2025 00:41:27 -0800 From: syzbot <syzbot+1f5bcc7c919ec578777a@...kaller.appspotmail.com> To: dwlsalmeida@...il.com, linux-kernel@...r.kernel.org, linux-media@...r.kernel.org, mchehab@...nel.org, syzkaller-bugs@...glegroups.com Subject: [syzbot] [media?] general protection fault in vidtv_psi_desc_assign Hello, syzbot found the following issue on: HEAD commit: c875a6c32467 Merge tag 'usb-6.19-rc3' of git://git.kernel... git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=10e63bb4580000 kernel config: https://syzkaller.appspot.com/x/.config?x=8bfa57a8c0ab3aa8 dashboard link: https://syzkaller.appspot.com/bug?extid=1f5bcc7c919ec578777a compiler: gcc (Debian 12.2.0-14+deb12u1) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/8899a01b839d/disk-c875a6c3.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/24b995d869e5/vmlinux-c875a6c3.xz kernel image: https://storage.googleapis.com/syzbot-assets/a87050fc4ee8/bzImage-c875a6c3.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+1f5bcc7c919ec578777a@...kaller.appspotmail.com RBP: 00007fbc65813f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fbc659e6038 R14: 00007fbc659e5fa0 R15: 00007ffcd46bbaa8 </TASK> 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: 17992 Comm: syz.1.2581 Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 RIP: 0010:vidtv_psi_desc_assign+0x24/0x90 drivers/media/test-drivers/vidtv/vidtv_psi.c:629 Code: 90 90 90 90 90 90 0f 1f 40 d6 41 54 55 48 89 f5 53 48 89 fb e8 dd 65 b9 f9 48 89 da 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 <80> 3c 02 00 75 47 4c 8b 23 49 39 ec 74 36 e8 b9 65 b9 f9 4d 85 e4 RSP: 0018:ffffc9000c61fa20 EFLAGS: 00010247 RAX: dffffc0000000000 RBX: 0000000000000005 RCX: ffffc9000daab000 RDX: 0000000000000000 RSI: ffffffff8804f313 RDI: 0000000000000005 RBP: ffff88807da44660 R08: 0000000000000000 R09: 4453534204050000 R10: 0000000000000005 R11: ffff88802cc229b0 R12: 0000000000000000 R13: ffff88807b485640 R14: ffff88801feace80 R15: ffff8880338e7800 FS: 00007fbc665bb6c0(0000) GS:ffff8881248fc000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200001000000 CR3: 00000000767b2000 CR4: 00000000003526f0 Call Trace: <TASK> vidtv_channel_pmt_match_sections drivers/media/test-drivers/vidtv/vidtv_channel.c:349 [inline] vidtv_channel_si_init+0x1445/0x1a50 drivers/media/test-drivers/vidtv/vidtv_channel.c:479 vidtv_mux_init+0x526/0xbe0 drivers/media/test-drivers/vidtv/vidtv_mux.c:519 vidtv_start_streaming drivers/media/test-drivers/vidtv/vidtv_bridge.c:194 [inline] vidtv_start_feed+0x33e/0x4d0 drivers/media/test-drivers/vidtv/vidtv_bridge.c:239 dmx_ts_feed_start_filtering+0xf6/0x220 drivers/media/dvb-core/dvb_demux.c:747 dvb_dmxdev_start_feed+0x273/0x3f0 drivers/media/dvb-core/dmxdev.c:655 dvb_dmxdev_filter_start+0x1b6/0xe10 drivers/media/dvb-core/dmxdev.c:766 dvb_dmxdev_pes_filter_set drivers/media/dvb-core/dmxdev.c:963 [inline] dvb_demux_do_ioctl+0x9de/0x12f0 drivers/media/dvb-core/dmxdev.c:1077 dvb_usercopy+0x167/0x340 drivers/media/dvb-core/dvbdev.c:999 dvb_demux_ioctl+0x29/0x40 drivers/media/dvb-core/dmxdev.c:1186 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:597 [inline] __se_sys_ioctl fs/ioctl.c:583 [inline] __x64_sys_ioctl+0x18e/0x210 fs/ioctl.c:583 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fbc6578f7c9 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:00007fbc665bb038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007fbc659e5fa0 RCX: 00007fbc6578f7c9 RDX: 0000000000000000 RSI: 0000000040146f2c RDI: 0000000000000003 RBP: 00007fbc65813f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fbc659e6038 R14: 00007fbc659e5fa0 R15: 00007ffcd46bbaa8 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:vidtv_psi_desc_assign+0x24/0x90 drivers/media/test-drivers/vidtv/vidtv_psi.c:629 Code: 90 90 90 90 90 90 0f 1f 40 d6 41 54 55 48 89 f5 53 48 89 fb e8 dd 65 b9 f9 48 89 da 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 <80> 3c 02 00 75 47 4c 8b 23 49 39 ec 74 36 e8 b9 65 b9 f9 4d 85 e4 RSP: 0018:ffffc9000c61fa20 EFLAGS: 00010247 RAX: dffffc0000000000 RBX: 0000000000000005 RCX: ffffc9000daab000 RDX: 0000000000000000 RSI: ffffffff8804f313 RDI: 0000000000000005 RBP: ffff88807da44660 R08: 0000000000000000 R09: 4453534204050000 R10: 0000000000000005 R11: ffff88802cc229b0 R12: 0000000000000000 R13: ffff88807b485640 R14: ffff88801feace80 R15: ffff8880338e7800 FS: 00007fbc665bb6c0(0000) GS:ffff8881248fc000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000557f4c7cc950 CR3: 00000000767b2000 CR4: 00000000003526f0 ---------------- Code disassembly (best guess): 0: 90 nop 1: 90 nop 2: 90 nop 3: 90 nop 4: 90 nop 5: 90 nop 6: 0f 1f 40 d6 nopl -0x2a(%rax) a: 41 54 push %r12 c: 55 push %rbp d: 48 89 f5 mov %rsi,%rbp 10: 53 push %rbx 11: 48 89 fb mov %rdi,%rbx 14: e8 dd 65 b9 f9 call 0xf9b965f6 19: 48 89 da mov %rbx,%rdx 1c: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 23: fc ff df 26: 48 c1 ea 03 shr $0x3,%rdx * 2a: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) <-- trapping instruction 2e: 75 47 jne 0x77 30: 4c 8b 23 mov (%rbx),%r12 33: 49 39 ec cmp %rbp,%r12 36: 74 36 je 0x6e 38: e8 b9 65 b9 f9 call 0xf9b965f6 3d: 4d 85 e4 test %r12,%r12 --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@...glegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup
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