program: r0 = syz_usb_connect(0x3, 0x40, &(0x7f0000000000)=ANY=[@ANYBLOB="12010002000000407205feca00010000000109022e0001010080fa0904000004ff000000070501020002000705810200020007050202000200070582020002"], 0x0) syz_usb_ep_read(r0, 0x1, 0x0, 0x0) syz_usb_ep_write(r0, 0x81, 0x0, 0x0) syz_usb_ep_read(r0, 0x1, 0x40, &(0x7f0000000400)) mkdirat(0xffffffffffffff9c, &(0x7f0000000040)='./sys\x00', 0x1ff) mount(&(0x7f0000000d00)=@filename='none\x00', &(0x7f0000000e00)='./sys\x00', &(0x7f0000000f00)='sysfs\x00', 0x0, 0x0) r1 = openat(0xffffffffffffff9c, &(0x7f0000001000)='./sys/devices/platform/dummy_hcd.0/usb5/5-1/5-1:1.0/adsl_state\x00', 0x2, 0x0) write(r1, &(0x7f0000001200)='stop\x00', 0x5) [ 94.875458][ T5289] Bluetooth: hci0: command tx timeout [ 95.180649][ T5324] usb 5-1: new high-speed USB device number 2 using dummy_hcd [ 95.334522][ T5324] usb 5-1: New USB device found, idVendor=0572, idProduct=cafe, bcdDevice= 1.00 [ 95.338149][ T5324] usb 5-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0 [ 95.552117][ T5324] cxacru 5-1:1.0: invalid response length to cm 0x90: 0 [ 96.920852][ T5289] Bluetooth: hci0: command tx timeout [ 98.201322][ T5331] cxacru 5-1:1.0: receive of cm 0x85 failed (-104) [ 98.205112][ T5331] Oops: general protection fault, probably for non-canonical address 0xdffffc0000000002: 0000 [#1] SMP KASAN NOPTI [ 98.209975][ T5331] KASAN: null-ptr-deref in range [0x0000000000000010-0x0000000000000017] [ 98.213393][ T5331] CPU: 0 UID: 0 PID: 5331 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full) [ 98.217018][ T5331] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 98.221100][ T5331] RIP: 0010:adsl_state_store+0x5cc/0x770 [ 98.223550][ T5331] Code: 03 42 80 3c 28 00 74 14 48 89 4c 24 10 48 8b 7c 24 10 e8 e7 2a 88 fa 48 8b 4c 24 10 48 8b 11 48 83 c2 10 48 89 d0 48 c1 e8 03 <42> 0f b6 04 28 84 c0 0f 85 4b 01 00 00 4d 89 f4 8b 32 48 c7 c7 e0 [ 98.231328][ T5331] RSP: 0018:ffffc9000e4e7b80 EFLAGS: 00010202 [ 98.233802][ T5331] RAX: 0000000000000002 RBX: 00000000ffffff98 RCX: ffff888012a8a078 [ 98.237002][ T5331] RDX: 0000000000000010 RSI: 0000000000000921 RDI: 0000000000000922 [ 98.240245][ T5331] RBP: ffffc9000e4e7c40 R08: ffffc9000e4e7907 R09: 1ffff92001c9cf20 [ 98.243520][ T5331] R10: dffffc0000000000 R11: fffff52001c9cf21 R12: ffff888012a94800 [ 98.246677][ T5331] R13: dffffc0000000000 R14: 0000000000000004 R15: 1ffff92001c9cf74 [ 98.249815][ T5331] FS: 00007fc1b27276c0(0000) GS:ffff88808c543000(0000) knlGS:0000000000000000 [ 98.253357][ T5331] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 98.256038][ T5331] CR2: 000055557fe57a58 CR3: 0000000040ae6000 CR4: 0000000000352ef0 [ 98.259305][ T5331] Call Trace: [ 98.260780][ T5331] [ 98.262069][ T5331] ? sysfs_file_kobj+0x1a/0x230 [ 98.264137][ T5331] ? __pfx_adsl_state_store+0x10/0x10 [ 98.266390][ T5331] ? sysfs_file_kobj+0x1e4/0x230 [ 98.268467][ T5331] ? sysfs_kf_write+0x166/0x260 [ 98.270509][ T5331] ? __pfx_sysfs_kf_write+0x10/0x10 [ 98.272692][ T5331] kernfs_fop_write_iter+0x3a4/0x540 [ 98.274919][ T5331] vfs_write+0x612/0xba0 [ 98.276689][ T5331] ? __pfx_vfs_write+0x10/0x10 [ 98.278675][ T5331] ? __fget_files+0x2a/0x420 [ 98.280568][ T5331] ksys_write+0x150/0x270 [ 98.282324][ T5331] ? __pfx_ksys_write+0x10/0x10 [ 98.284374][ T5331] ? entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 98.286945][ T5331] do_syscall_64+0x174/0x580 [ 98.288818][ T5331] ? clear_bhb_loop+0x40/0x90 [ 98.290777][ T5331] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 98.293320][ T5331] RIP: 0033:0x7fc1b179df99 [ 98.295185][ T5331] Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48 [ 98.303127][ T5331] RSP: 002b:00007fc1b2726fe8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 [ 98.306431][ T5331] RAX: ffffffffffffffda RBX: 00007fc1b1a26090 RCX: 00007fc1b179df99 [ 98.309645][ T5331] RDX: 0000000000000005 RSI: 0000200000001200 RDI: 0000000000000004 [ 98.312888][ T5331] RBP: 00007fc1b1834ec4 R08: 0000000000000000 R09: 0000000000000000 [ 98.316010][ T5331] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 [ 98.319365][ T5331] R13: 00007fc1b1a26128 R14: 00007fc1b1a26090 R15: 00007fff838eac28 [ 98.322650][ T5331] [ 98.323935][ T5331] Modules linked in: [ 98.325932][ T5331] ---[ end trace 0000000000000000 ]--- [ 98.329293][ T5331] RIP: 0010:adsl_state_store+0x5cc/0x770 [ 98.331727][ T5331] Code: 03 42 80 3c 28 00 74 14 48 89 4c 24 10 48 8b 7c 24 10 e8 e7 2a 88 fa 48 8b 4c 24 10 48 8b 11 48 83 c2 10 48 89 d0 48 c1 e8 03 <42> 0f b6 04 28 84 c0 0f 85 4b 01 00 00 4d 89 f4 8b 32 48 c7 c7 e0 [ 98.339325][ T5331] RSP: 0018:ffffc9000e4e7b80 EFLAGS: 00010202 [ 98.341973][ T5331] RAX: 0000000000000002 RBX: 00000000ffffff98 RCX: ffff888012a8a078 [ 98.345285][ T5331] RDX: 0000000000000010 RSI: 0000000000000921 RDI: 0000000000000922 [ 98.348449][ T5331] RBP: ffffc9000e4e7c40 R08: ffffc9000e4e7907 R09: 1ffff92001c9cf20 [ 98.351731][ T5331] R10: dffffc0000000000 R11: fffff52001c9cf21 R12: ffff888012a94800 [ 98.354906][ T5331] R13: dffffc0000000000 R14: 0000000000000004 R15: 1ffff92001c9cf74 [ 98.358210][ T5331] FS: 00007fc1b27276c0(0000) GS:ffff88808c543000(0000) knlGS:0000000000000000 [ 98.361927][ T5331] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 98.365086][ T5331] CR2: 000055557fe57a58 CR3: 0000000040ae6000 CR4: 0000000000352ef0 [ 98.368484][ T5331] Kernel panic - not syncing: Fatal exception [ 98.371332][ T5331] Kernel Offset: disabled [ 98.373107][ T5331] Rebooting in 86400 seconds..