Hello, syzbot found the following issue on: HEAD commit: 5dadc1be8fc5 Merge tag 'char-misc-6.11-rc7' of git://git.k.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=16784e00580000 kernel config: https://syzkaller.appspot.com/x/.config?x=58a85aa6925a8b78 dashboard link: https://syzkaller.appspot.com/bug?extid=f9f5333782a854509322 compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 userspace arch: i386 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/21e48b60b45c/disk-5dadc1be.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/92982a88343c/vmlinux-5dadc1be.xz kernel image: https://storage.googleapis.com/syzbot-assets/2149656ca3d1/bzImage-5dadc1be.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+f9f5333782a854509322@xxxxxxxxxxxxxxxxxxxxxxxxx Oops: general protection fault, probably for non-canonical address 0xdffffc0000000019: 0000 [#1] PREEMPT SMP KASAN PTI KASAN: null-ptr-deref in range [0x00000000000000c8-0x00000000000000cf] CPU: 0 UID: 0 PID: 10852 Comm: syz.3.1595 Not tainted 6.11.0-rc6-syzkaller-00355-g5dadc1be8fc5 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 RIP: 0010:__mutex_lock_common kernel/locking/mutex.c:587 [inline] RIP: 0010:__mutex_lock+0xf2/0xd70 kernel/locking/mutex.c:752 Code: c0 c0 b9 33 9a 48 c1 e8 03 42 0f b6 04 20 84 c0 0f 85 79 0b 00 00 83 3d bb 28 71 0e 00 75 21 49 8d 7d 60 48 89 f8 48 c1 e8 03 <42> 80 3c 20 00 74 05 e8 b2 42 38 f6 4d 39 6d 60 0f 85 f3 0a 00 00 RSP: 0018:ffffc9000313ef60 EFLAGS: 00010202 RAX: 0000000000000019 RBX: 0000000000000000 RCX: ffffffff9a33b903 RDX: dffffc0000000000 RSI: ffff888030280000 RDI: 00000000000000c8 RBP: ffffc9000313f0b8 R08: ffffc9000313f027 R09: 0000000000000000 R10: ffffc9000313f000 R11: fffff52000627e05 R12: dffffc0000000000 R13: 0000000000000068 R14: 0000000000000000 R15: ffff888060c51958 FS: 0000000000000000(0000) GS:ffff8880b8800000(0063) knlGS:00000000f5776b40 CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 CR2: 00007f35653215e8 CR3: 0000000028422000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> dvb_usbv2_generic_write+0x26/0x50 drivers/media/usb/dvb-usb-v2/dvb_usb_urb.c:77 mxl111sf_ctrl_msg+0x143/0x270 drivers/media/usb/dvb-usb-v2/mxl111sf.c:73 mxl111sf_write_reg+0xd8/0x1f0 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_xfer+0x91e/0x8a30 drivers/media/usb/dvb-usb-v2/mxl111sf-i2c.c:813 __i2c_transfer+0x866/0x21f0 i2c_transfer+0x271/0x3b0 drivers/i2c/i2c-core-base.c:2304 i2cdev_ioctl_rdwr+0x452/0x700 drivers/i2c/i2c-dev.c:309 compat_i2cdev_ioctl+0x7ca/0x8e0 drivers/i2c/i2c-dev.c:576 __do_compat_sys_ioctl fs/ioctl.c:1007 [inline] __se_compat_sys_ioctl+0x51c/0xca0 fs/ioctl.c:950 do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline] __do_fast_syscall_32+0xb4/0x110 arch/x86/entry/common.c:386 do_fast_syscall_32+0x34/0x80 arch/x86/entry/common.c:411 entry_SYSENTER_compat_after_hwframe+0x84/0x8e RIP: 0023:0xf747d579 Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 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 90 90 RSP: 002b:00000000f577656c EFLAGS: 00000206 ORIG_RAX: 0000000000000036 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000000707 RDX: 0000000020001100 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:__mutex_lock_common kernel/locking/mutex.c:587 [inline] RIP: 0010:__mutex_lock+0xf2/0xd70 kernel/locking/mutex.c:752 Code: c0 c0 b9 33 9a 48 c1 e8 03 42 0f b6 04 20 84 c0 0f 85 79 0b 00 00 83 3d bb 28 71 0e 00 75 21 49 8d 7d 60 48 89 f8 48 c1 e8 03 <42> 80 3c 20 00 74 05 e8 b2 42 38 f6 4d 39 6d 60 0f 85 f3 0a 00 00 RSP: 0018:ffffc9000313ef60 EFLAGS: 00010202 RAX: 0000000000000019 RBX: 0000000000000000 RCX: ffffffff9a33b903 RDX: dffffc0000000000 RSI: ffff888030280000 RDI: 00000000000000c8 RBP: ffffc9000313f0b8 R08: ffffc9000313f027 R09: 0000000000000000 R10: ffffc9000313f000 R11: fffff52000627e05 R12: dffffc0000000000 R13: 0000000000000068 R14: 0000000000000000 R15: ffff888060c51958 FS: 0000000000000000(0000) GS:ffff8880b8800000(0063) knlGS:00000000f5776b40 CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 CR2: 000055f273f047f0 CR3: 0000000028422000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: c0 c0 b9 rol $0xb9,%al 3: 33 9a 48 c1 e8 03 xor 0x3e8c148(%rdx),%ebx 9: 42 0f b6 04 20 movzbl (%rax,%r12,1),%eax e: 84 c0 test %al,%al 10: 0f 85 79 0b 00 00 jne 0xb8f 16: 83 3d bb 28 71 0e 00 cmpl $0x0,0xe7128bb(%rip) # 0xe7128d8 1d: 75 21 jne 0x40 1f: 49 8d 7d 60 lea 0x60(%r13),%rdi 23: 48 89 f8 mov %rdi,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 42 80 3c 20 00 cmpb $0x0,(%rax,%r12,1) <-- trapping instruction 2f: 74 05 je 0x36 31: e8 b2 42 38 f6 call 0xf63842e8 36: 4d 39 6d 60 cmp %r13,0x60(%r13) 3a: 0f 85 f3 0a 00 00 jne 0xb33 --- 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@xxxxxxxxxxxxxxxx. 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
