./strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ./syz-executor3799638046 <...> DUID 00:04:4f:52:9e:ef:28:bc:79:ad:2a:9e:d1:97:f2:e1:e7:a4 forked to background, child pid 4666 [ 21.632680][ T4667] 8021q: adding VLAN 0 to HW filter on device bond0 [ 21.642455][ T4667] eql: remember to turn off Van-Jacobson compression on your slave devices Starting sshd: OK syzkaller Warning: Permanently added '10.128.1.136' (ECDSA) to the list of known hosts. execve("./syz-executor3799638046", ["./syz-executor3799638046"], 0x7fff367d5350 /* 10 vars */) = 0 brk(NULL) = 0x555555be9000 brk(0x555555be9c40) = 0x555555be9c40 arch_prctl(ARCH_SET_FS, 0x555555be9300) = 0 uname({sysname="Linux", nodename="syzkaller", ...}) = 0 readlink("/proc/self/exe", "/root/syz-executor3799638046", 4096) = 28 brk(0x555555c0ac40) = 0x555555c0ac40 brk(0x555555c0b000) = 0x555555c0b000 mprotect(0x7f09daf15000, 16384, PROT_READ) = 0 mmap(0x1ffff000, 4096, PROT_NONE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x1ffff000 mmap(0x20000000, 16777216, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x20000000 mmap(0x21000000, 4096, PROT_NONE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x21000000 openat(AT_FDCWD, "/dev/raw-gadget", O_RDWR) = 3 ioctl(3, USB_RAW_IOCTL_INIT, 0x7fff325756e0) = 0 ioctl(3, UI_DEV_CREATE or USB_RAW_IOCTL_RUN, 0) = 0 ioctl(3, USB_RAW_IOCTL_EVENT_FETCH, 0x7fff325756e0) = 0 ioctl(3, USB_RAW_IOCTL_EVENT_FETCH, 0x7fff325756e0) = 0 ioctl(3, USB_RAW_IOCTL_EP0_WRITE, 0x7fff325746d0) = 18 syzkaller login: [ 45.217031][ T7] usb 1-1: new high-speed USB device number 2 using dummy_hcd ioctl(3, USB_RAW_IOCTL_EVENT_FETCH, 0x7fff325756e0) = 0 ioctl(3, USB_RAW_IOCTL_EP0_WRITE, 0x7fff325746d0) = 18 [ 45.457049][ T7] usb 1-1: Using ep0 maxpacket: 16 ioctl(3, USB_RAW_IOCTL_EVENT_FETCH, 0x7fff325756e0) = 0 ioctl(3, USB_RAW_IOCTL_EP0_WRITE, 0x7fff325746d0) = 9 ioctl(3, USB_RAW_IOCTL_EVENT_FETCH, 0x7fff325756e0) = 0 ioctl(3, USB_RAW_IOCTL_EP0_WRITE, 0x7fff325746d0) = 18 ioctl(3, USB_RAW_IOCTL_EVENT_FETCH, 0x7fff325756e0) = 0 ioctl(3, USB_RAW_IOCTL_EP0_WRITE, 0x7fff325746d0) = 4 ioctl(3, USB_RAW_IOCTL_EVENT_FETCH, 0x7fff325756e0) = 0 ioctl(3, USB_RAW_IOCTL_EP0_WRITE, 0x7fff325746d0) = 8 ioctl(3, USB_RAW_IOCTL_EVENT_FETCH, 0x7fff325756e0) = 0 ioctl(3, USB_RAW_IOCTL_EP0_WRITE, 0x7fff325746d0) = 8 ioctl(3, USB_RAW_IOCTL_EVENT_FETCH, 0x7fff325756e0) = 0 ioctl(3, USB_RAW_IOCTL_EP0_WRITE, 0x7fff325746d0) = 8 ioctl(3, USB_RAW_IOCTL_EVENT_FETCH, 0x7fff325756e0) = 0 ioctl(3, USB_RAW_IOCTL_VBUS_DRAW, 0) = 0 ioctl(3, USB_RAW_IOCTL_CONFIGURE, 0) = 0 ioctl(3, USB_RAW_IOCTL_EP0_READ, 0x7fff325746d0) = 0 [ 45.747083][ T7] usb 1-1: New USB device found, idVendor=2040, idProduct=c0a0, bcdDevice= 9.80 [ 45.756544][ T7] usb 1-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3 [ 45.764550][ T7] usb 1-1: Product: syz [ 45.768738][ T7] usb 1-1: Manufacturer: syz [ 45.773308][ T7] usb 1-1: SerialNumber: syz [ 45.779793][ T7] usb 1-1: config 0 descriptor?? [ 45.819051][ T7] smsusb:smsusb_probe: board id=8, interface number 0 [ 45.825915][ T7] ------------[ cut here ]------------ [ 45.831392][ T7] WARNING: CPU: 0 PID: 7 at kernel/workqueue.c:3182 __flush_work+0x946/0xb60 [ 45.840224][ T7] Modules linked in: [ 45.844103][ T7] CPU: 0 PID: 7 Comm: kworker/0:0 Not tainted 6.4.0-rc5-syzkaller #0 [ 45.852179][ T7] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/25/2023 [ 45.862249][ T7] Workqueue: usb_hub_wq hub_event [ 45.867293][ T7] RIP: 0010:__flush_work+0x946/0xb60 [ 45.872589][ T7] Code: 00 48 c7 c6 0b f8 53 81 48 c7 c7 c0 90 79 8c e8 d0 ef 11 00 e9 6f fc ff ff e8 06 4e 30 00 0f 0b e9 63 fc ff ff e8 fa 4d 30 00 <0f> 0b 45 31 ed e9 54 fc ff ff e8 cb 16 83 00 e9 3e fb ff ff e8 e1 [ 45.892249][ T7] RSP: 0018:ffffc900000c6c08 EFLAGS: 00010293 [ 45.898355][ T7] RAX: 0000000000000000 RBX: ffff88802bed40e8 RCX: 0000000000000000 [ 45.906339][ T7] RDX: ffff88801627bb80 RSI: ffffffff8153f846 RDI: 0000000000000001 [ 45.915010][ T7] RBP: ffffc900000c6da0 R08: 0000000000000001 R09: 0000000000000000 [ 45.923108][ T7] R10: 0000000000000001 R11: ffffffff810055ef R12: ffff88802bed40e8 [ 45.931123][ T7] R13: 0000000000000001 R14: 0000000000000001 R15: ffff88802bed4100 [ 45.939149][ T7] FS: 0000000000000000(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000 [ 45.948135][ T7] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 45.954715][ T7] CR2: 000055d72c82ab40 CR3: 00000000274f9000 CR4: 0000000000350ef0 [ 45.962719][ T7] Call Trace: [ 45.965998][ T7] [ 45.968957][ T7] ? __warn+0xe6/0x390 [ 45.973043][ T7] ? __flush_work+0x946/0xb60 [ 45.977847][ T7] ? report_bug+0x2da/0x500 [ 45.982430][ T7] ? handle_bug+0x3c/0x70 [ 45.986738][ T7] ? exc_invalid_op+0x18/0x50 [ 45.991438][ T7] ? asm_exc_invalid_op+0x1a/0x20 [ 45.996480][ T7] ? ret_from_fork+0x1f/0x30 [ 46.001105][ T7] ? __flush_work+0x946/0xb60 [ 46.005795][ T7] ? __flush_work+0x946/0xb60 [ 46.010529][ T7] ? __flush_work+0x946/0xb60 exit_group(0) = ? +++ exited with 0 +++ [ 46.015222][ T7] ? lockdep_hardirqs_on+0x7d/0x100