Oops: general protection fault, probably for non-canonical address 0xdffffc0000000019: 0000 [#1] SMP KASAN PTI KASAN: null-ptr-deref in range [0x00000000000000c8-0x00000000000000cf] CPU: 0 UID: 0 PID: 6931 Comm: syz.1.275 Not tainted 6.15.0-rc6-syzkaller-00047-ge9565e23cd89 #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 RIP: 0010:__mutex_lock_common kernel/locking/mutex.c:580 [inline] RIP: 0010:__mutex_lock+0x138/0xe80 kernel/locking/mutex.c:746 Code: a0 b6 80 99 48 c1 e8 03 42 0f b6 04 28 84 c0 0f 85 0d 0c 00 00 83 3d 16 0d 29 0e 00 75 23 49 8d 7c 24 60 48 89 f8 48 c1 e8 03 <42> 80 3c 28 00 74 05 e8 4c 3d ca f6 4d 39 64 24 60 0f 85 7b 0b 00 RSP: 0018:ffffc9000b6871c0 EFLAGS: 00010202 RAX: 0000000000000019 RBX: 0000000000000000 RCX: ffffffff9980b603 RDX: ffff888034118000 RSI: ffffffff8d936f16 RDI: 00000000000000c8 RBP: ffffc9000b687358 R08: ffffc9000b6872c7 R09: 0000000000000000 R10: ffffc9000b6872a0 R11: fffff520016d0e59 R12: 0000000000000068 R13: dffffc0000000000 R14: ffff888031bef158 R15: 0000000000000000 FS: 00007f21531f66c0(0000) GS:ffff8881260c7000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000110c382cb1 CR3: 00000000110d8000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> dvb_usbv2_generic_write+0x26/0x60 drivers/media/usb/dvb-usb-v2/dvb_usb_urb.c:77 mxl111sf_ctrl_msg+0x16a/0x2e0 drivers/media/usb/dvb-usb-v2/mxl111sf.c:73 mxl111sf_write_reg+0xa0/0x180 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+0x461/0x4f00 drivers/media/usb/dvb-usb-v2/mxl111sf-i2c.c:813 __i2c_transfer+0x874/0x2170 drivers/i2c/i2c-core-base.c:-1 i2c_transfer+0x25b/0x3a0 drivers/i2c/i2c-core-base.c:2315 i2c_transfer_buffer_flags+0x105/0x190 drivers/i2c/i2c-core-base.c:2343 i2c_master_send include/linux/i2c.h:109 [inline] i2cdev_write+0x112/0x1b0 drivers/i2c/i2c-dev.c:183 vfs_write+0x27e/0xa90 fs/read_write.c:682 ksys_write+0x145/0x250 fs/read_write.c:736 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f215538e969 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:00007f21531f6038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f21555b5fa0 RCX: 00007f215538e969 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000005 RBP: 00007f2155410ab1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f21555b5fa0 R15: 00007f21556dfa28 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:__mutex_lock_common kernel/locking/mutex.c:580 [inline] RIP: 0010:__mutex_lock+0x138/0xe80 kernel/locking/mutex.c:746 Code: a0 b6 80 99 48 c1 e8 03 42 0f b6 04 28 84 c0 0f 85 0d 0c 00 00 83 3d 16 0d 29 0e 00 75 23 49 8d 7c 24 60 48 89 f8 48 c1 e8 03 <42> 80 3c 28 00 74 05 e8 4c 3d ca f6 4d 39 64 24 60 0f 85 7b 0b 00 RSP: 0018:ffffc9000b6871c0 EFLAGS: 00010202 RAX: 0000000000000019 RBX: 0000000000000000 RCX: ffffffff9980b603 RDX: ffff888034118000 RSI: ffffffff8d936f16 RDI: 00000000000000c8 RBP: ffffc9000b687358 R08: ffffc9000b6872c7 R09: 0000000000000000 R10: ffffc9000b6872a0 R11: fffff520016d0e59 R12: 0000000000000068 R13: dffffc0000000000 R14: ffff888031bef158 R15: 0000000000000000 FS: 00007f21531f66c0(0000) GS:ffff8881260c7000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000252030 CR3: 00000000110d8000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: a0 b6 80 99 48 c1 e8 movabs 0x4203e8c1489980b6,%al 7: 03 42 9: 0f b6 04 28 movzbl (%rax,%rbp,1),%eax d: 84 c0 test %al,%al f: 0f 85 0d 0c 00 00 jne 0xc22 15: 83 3d 16 0d 29 0e 00 cmpl $0x0,0xe290d16(%rip) # 0xe290d32 1c: 75 23 jne 0x41 1e: 49 8d 7c 24 60 lea 0x60(%r12),%rdi 23: 48 89 f8 mov %rdi,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 42 80 3c 28 00 cmpb $0x0,(%rax,%r13,1) <-- trapping instruction 2f: 74 05 je 0x36 31: e8 4c 3d ca f6 call 0xf6ca3d82 36: 4d 39 64 24 60 cmp %r12,0x60(%r12) 3b: 0f .byte 0xf 3c: 85 7b 0b test %edi,0xb(%rbx)