Oops: general protection fault, probably for non-canonical address 0xdffffc0000000018: 0000 [#1] SMP KASAN PTI KASAN: null-ptr-deref in range [0x00000000000000c0-0x00000000000000c7] CPU: 1 UID: 0 PID: 9438 Comm: syz.0.1235 Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026 RIP: 0010:__mutex_lock_common kernel/locking/mutex.c:611 [inline] RIP: 0010:__mutex_lock+0x14e/0x1550 kernel/locking/mutex.c:806 Code: e0 23 4c 9a 48 c1 e8 03 42 0f b6 04 30 84 c0 0f 85 3e 12 00 00 83 3d b0 09 92 0e 00 75 23 49 8d 7c 24 58 48 89 f8 48 c1 e8 03 <42> 80 3c 30 00 74 05 e8 d6 f1 76 f6 4d 39 64 24 58 0f 85 6a 11 00 RSP: 0018:ffffc900062bf1c0 EFLAGS: 00010206 RAX: 0000000000000018 RBX: 0000000000000000 RCX: ffffffff9a4c2303 RDX: 0000000000000000 RSI: ffffffff8e24e53f RDI: 00000000000000c0 RBP: ffffc900062bf378 R08: ffffc900062bf2e7 R09: 0000000000000000 R10: ffffc900062bf2c0 R11: fffff52000c57e5d R12: 0000000000000068 R13: 0000000000000000 R14: dffffc0000000000 R15: 1ffff92000c57e50 FS: 0000000000000000(0000) GS:ffff888125314000(0063) knlGS:00000000f53e6b40 CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 CR2: 000000000c2ee3d3 CR3: 0000000053fba000 CR4: 00000000003526f0 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+0x496/0x5100 drivers/media/usb/dvb-usb-v2/mxl111sf-i2c.c:813 __i2c_transfer+0x79a/0x1f70 drivers/i2c/i2c-core-base.c:-1 i2c_transfer+0x1cc/0x2d0 drivers/i2c/i2c-core-base.c:2317 i2c_transfer_buffer_flags+0x10d/0x1a0 drivers/i2c/i2c-core-base.c:2345 i2c_master_recv include/linux/i2c.h:79 [inline] i2cdev_read+0x10d/0x250 drivers/i2c/i2c-dev.c:155 do_loop_readv_writev fs/read_write.c:849 [inline] vfs_readv+0x587/0x840 fs/read_write.c:1022 do_readv+0x154/0x2e0 fs/read_write.c:1082 do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline] __do_fast_syscall_32+0x229/0x6e0 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: 0023:0xf7f2301c 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:00000000f53e650c EFLAGS: 00000206 ORIG_RAX: 0000000000000091 RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 0000000080000340 RDX: 0000000000000001 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:611 [inline] RIP: 0010:__mutex_lock+0x14e/0x1550 kernel/locking/mutex.c:806 Code: e0 23 4c 9a 48 c1 e8 03 42 0f b6 04 30 84 c0 0f 85 3e 12 00 00 83 3d b0 09 92 0e 00 75 23 49 8d 7c 24 58 48 89 f8 48 c1 e8 03 <42> 80 3c 30 00 74 05 e8 d6 f1 76 f6 4d 39 64 24 58 0f 85 6a 11 00 RSP: 0018:ffffc900062bf1c0 EFLAGS: 00010206 RAX: 0000000000000018 RBX: 0000000000000000 RCX: ffffffff9a4c2303 RDX: 0000000000000000 RSI: ffffffff8e24e53f RDI: 00000000000000c0 RBP: ffffc900062bf378 R08: ffffc900062bf2e7 R09: 0000000000000000 R10: ffffc900062bf2c0 R11: fffff52000c57e5d R12: 0000000000000068 R13: 0000000000000000 R14: dffffc0000000000 R15: 1ffff92000c57e50 FS: 0000000000000000(0000) GS:ffff888125214000(0063) knlGS:00000000f53e6b40 CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 CR2: 00000000f7418108 CR3: 0000000053fba000 CR4: 00000000003526f0 ---------------- Code disassembly (best guess): 0: e0 23 loopne 0x25 2: 4c 9a rex.WR (bad) 4: 48 c1 e8 03 shr $0x3,%rax 8: 42 0f b6 04 30 movzbl (%rax,%r14,1),%eax d: 84 c0 test %al,%al f: 0f 85 3e 12 00 00 jne 0x1253 15: 83 3d b0 09 92 0e 00 cmpl $0x0,0xe9209b0(%rip) # 0xe9209cc 1c: 75 23 jne 0x41 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: 42 80 3c 30 00 cmpb $0x0,(%rax,%r14,1) <-- trapping instruction 2f: 74 05 je 0x36 31: e8 d6 f1 76 f6 call 0xf676f20c 36: 4d 39 64 24 58 cmp %r12,0x58(%r12) 3b: 0f .byte 0xf 3c: 85 6a 11 test %ebp,0x11(%rdx)