Oops: general protection fault, probably for non-canonical address 0xdffffc0000000018: 0000 [#1] SMP KASAN PTI KASAN: null-ptr-deref in range [0x00000000000000c0-0x00000000000000c7] CPU: 0 UID: 0 PID: 18146 Comm: syz.2.1738 Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026 RIP: 0010:__mutex_lock_common kernel/locking/mutex.c:625 [inline] RIP: 0010:__mutex_lock+0x149/0x1550 kernel/locking/mutex.c:821 Code: c0 80 85 4a 9a 48 c1 e8 03 0f b6 04 18 84 c0 0f 85 35 12 00 00 83 3d f5 86 96 0e 00 75 22 49 8d 7c 24 58 48 89 f8 48 c1 e8 03 <80> 3c 18 00 74 05 e8 fc c3 7f f6 4d 39 64 24 58 0f 85 48 11 00 00 RSP: 0018:ffffc9001033efc0 EFLAGS: 00010206 RAX: 0000000000000018 RBX: dffffc0000000000 RCX: ffffffff9a4a8503 RDX: 0000000000000000 RSI: 000000000000026f RDI: 00000000000000c0 RBP: ffffc9001033f158 R08: ffffc9001033f0c7 R09: 0000000000000000 R10: ffffc9001033f0a0 R11: fffff52002067e19 R12: 0000000000000068 R13: 0000000000000000 R14: 1ffff92002067e0c R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff88812522d000(0063) knlGS:00000000f543db40 CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 CR2: 00000000f543b4d8 CR3: 0000000038d0c000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000002 DR3: ffffffffafffff15 DR6: 00000000ffff0ff0 DR7: 0000000000000400 Call Trace: dvb_usbv2_generic_write+0x26/0x60 drivers/media/usb/dvb-usb-v2/dvb_usb_urb.c:77 mxl111sf_ctrl_msg+0x160/0x2f0 drivers/media/usb/dvb-usb-v2/mxl111sf.c:73 mxl111sf_write_reg+0xa9/0x1b0 drivers/media/usb/dvb-usb-v2/mxl111sf.c:123 mxl111sf_i2c_start drivers/media/usb/dvb-usb-v2/mxl111sf-i2c.c:130 [inline] mxl111sf_i2c_sw_xfer_msg drivers/media/usb/dvb-usb-v2/mxl111sf-i2c.c:-1 [inline] mxl111sf_i2c_xfer+0x463/0x5060 drivers/media/usb/dvb-usb-v2/mxl111sf-i2c.c:813 __i2c_transfer+0x7be/0x1fe0 drivers/i2c/i2c-core-base.c:-1 i2c_smbus_xfer_emulated drivers/i2c/i2c-core-smbus.c:471 [inline] __i2c_smbus_xfer+0x1584/0x27d0 drivers/i2c/i2c-core-smbus.c:621 i2c_smbus_xfer+0x1f4/0x310 drivers/i2c/i2c-core-smbus.c:547 i2cdev_ioctl_smbus+0x407/0x700 drivers/i2c/i2c-dev.c:389 compat_i2cdev_ioctl+0x29d/0x5c0 drivers/i2c/i2c-dev.c:585 __do_compat_sys_ioctl fs/ioctl.c:695 [inline] __se_compat_sys_ioctl fs/ioctl.c:638 [inline] __ia32_compat_sys_ioctl+0x5ea/0x950 fs/ioctl.c:638 do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline] __do_fast_syscall_32+0x23e/0x6f0 arch/x86/entry/syscall_32.c:307 do_fast_syscall_32+0x33/0x70 arch/x86/entry/syscall_32.c:332 entry_SYSENTER_compat_after_hwframe+0x84/0x8e RIP: 0023:0xf704f0ec Code: 90 85 d2 74 0a 89 ce 81 e6 ff 0f 00 00 89 32 85 c0 74 05 c1 e9 0c 89 08 31 c0 5e 5d c3 90 0f 1f 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 58 b8 RSP: 002b:00000000f543d50c EFLAGS: 00000206 ORIG_RAX: 0000000000000036 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000000720 RDX: 0000000080000080 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:__mutex_lock_common kernel/locking/mutex.c:625 [inline] RIP: 0010:__mutex_lock+0x149/0x1550 kernel/locking/mutex.c:821 Code: c0 80 85 4a 9a 48 c1 e8 03 0f b6 04 18 84 c0 0f 85 35 12 00 00 83 3d f5 86 96 0e 00 75 22 49 8d 7c 24 58 48 89 f8 48 c1 e8 03 <80> 3c 18 00 74 05 e8 fc c3 7f f6 4d 39 64 24 58 0f 85 48 11 00 00 RSP: 0018:ffffc9001033efc0 EFLAGS: 00010206 RAX: 0000000000000018 RBX: dffffc0000000000 RCX: ffffffff9a4a8503 RDX: 0000000000000000 RSI: 000000000000026f RDI: 00000000000000c0 RBP: ffffc9001033f158 R08: ffffc9001033f0c7 R09: 0000000000000000 R10: ffffc9001033f0a0 R11: fffff52002067e19 R12: 0000000000000068 R13: 0000000000000000 R14: 1ffff92002067e0c R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff88812522d000(0063) knlGS:00000000f543db40 CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 CR2: 0000000080001ac0 CR3: 0000000038d0c000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000002 DR3: ffffffffafffff15 DR6: 00000000ffff0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: c0 80 85 4a 9a 48 c1 rolb $0xc1,0x489a4a85(%rax) 7: e8 03 0f b6 04 call 0x4b60f0f c: 18 84 c0 0f 85 35 12 sbb %al,0x1235850f(%rax,%rax,8) 13: 00 00 add %al,(%rax) 15: 83 3d f5 86 96 0e 00 cmpl $0x0,0xe9686f5(%rip) # 0xe968711 1c: 75 22 jne 0x40 1e: 49 8d 7c 24 58 lea 0x58(%r12),%rdi 23: 48 89 f8 mov %rdi,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 80 3c 18 00 cmpb $0x0,(%rax,%rbx,1) <-- trapping instruction 2e: 74 05 je 0x35 30: e8 fc c3 7f f6 call 0xf67fc431 35: 4d 39 64 24 58 cmp %r12,0x58(%r12) 3a: 0f 85 48 11 00 00 jne 0x1188