Hi, Andrey Konovalov <andreyknvl@xxxxxxxxxx> writes: > Hi! > > I've got the following error report while running the syzkaller fuzzer. > > On commit 3c49de52d5647cda8b42c4255cf8a29d1e22eff5 (Dec 2). > > WARNING: CPU: 0 PID: 5257 at drivers/usb/gadget/udc/dummy_hcd.c:672 > dummy_free_request+0x153/0x170 > Kernel panic - not syncing: panic_on_warn set ... > > usb 2-1: string descriptor 0 read error: -71 > usb 2-1: New USB device found, idVendor=0000, idProduct=0000 > usb 2-1: New USB device strings: Mfr=0, Product=170, SerialNumber=0 > CPU: 0 PID: 5257 Comm: syz-executor0 Not tainted 4.9.0-rc7+ #16 > Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011 > ffff88006af0ec48 ffffffff81f96aba ffffffff00000200 1ffff1000d5e1d1c > ffffed000d5e1d14 0000000000000a06 0000000041b58ab3 ffffffff8598b4c8 > ffffffff81f96828 0000000041b58ab3 ffffffff85942a10 ffffffff81432790 > Call Trace: > [< inline >] __dump_stack lib/dump_stack.c:15 > [<ffffffff81f96aba>] dump_stack+0x292/0x398 lib/dump_stack.c:51 > [<ffffffff8168c7be>] panic+0x1cb/0x3a9 kernel/panic.c:179 > [<ffffffff812b80b4>] __warn+0x1c4/0x1e0 kernel/panic.c:542 > [<ffffffff812b831c>] warn_slowpath_null+0x2c/0x40 kernel/panic.c:585 > [<ffffffff830fcac3>] dummy_free_request+0x153/0x170 > drivers/usb/gadget/udc/dummy_hcd.c:672 > [<ffffffff830ed160>] usb_ep_free_request+0xc0/0x420 > drivers/usb/gadget/udc/core.c:195 > [<ffffffff83224fe1>] gadgetfs_unbind+0x131/0x190 > drivers/usb/gadget/legacy/inode.c:1612 > [<ffffffff830ebcbf>] usb_gadget_remove_driver+0x10f/0x2b0 > drivers/usb/gadget/udc/core.c:1228 > [<ffffffff830ec016>] usb_gadget_unregister_driver+0x1b6/0x2c0 > drivers/usb/gadget/udc/core.c:1357 > [<ffffffff83224650>] dev_release+0x80/0x160 > drivers/usb/gadget/legacy/inode.c:1187 > [<ffffffff81805852>] __fput+0x332/0x7f0 fs/file_table.c:208 > [<ffffffff81805d95>] ____fput+0x15/0x20 fs/file_table.c:244 > [<ffffffff81338b9b>] task_work_run+0x19b/0x270 kernel/task_work.c:116 > [< inline >] exit_task_work include/linux/task_work.h:21 > [<ffffffff812c7eca>] do_exit+0x16aa/0x2530 kernel/exit.c:828 > [<ffffffff812cd749>] do_group_exit+0x149/0x420 kernel/exit.c:932 > [<ffffffff812faa9d>] get_signal+0x76d/0x17b0 kernel/signal.c:2307 > [<ffffffff811cfee2>] do_signal+0xd2/0x2120 arch/x86/kernel/signal.c:807 > [<ffffffff81003d00>] exit_to_usermode_loop+0x170/0x200 > arch/x86/entry/common.c:156 > [< inline >] prepare_exit_to_usermode arch/x86/entry/common.c:190 > [<ffffffff81007293>] syscall_return_slowpath+0x3d3/0x420 > arch/x86/entry/common.c:259 > [<ffffffff84f47f62>] entry_SYSCALL_64_fastpath+0xc0/0xc2 > Dumping ftrace buffer: > (ftrace buffer empty) > Kernel Offset: disabled There have been several emails like this one. Can you check if my branch testing/fixes is working for you? -- balbi
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