syzbot

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kernel BUG at drivers/usb/usbip/vhci_sysfs.c:396!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 10308 Comm: syz-executor241 Not tainted 5.11.0-rc6-next-20210205-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:attach_store.cold+0x376/0x396 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/drivers/usb/usbip/vhci_sysfs.c:396
Code: e8 47 0d d0 f8 48 8b 5d 70 48 c7 c7 00 f0 ff ff 48 89 de e8 b4 50 8c f8 48 81 fb 00 f0 ff ff 0f 87 56 ff ff ff e8 b2 48 8c f8 <0f> 0b e8 ab 48 8c f8 8b b4 24 90 00 00 00 48 89 ef e8 5c ff b3 fc
RSP: 0018:ffffc9000171fb58 EFLAGS: 00010293
RAX: 0000000000000000 RBX: ffff888020641c00 RCX: 0000000000000000
RDX: ffff8880141db800 RSI: ffffffff88e6a42e RDI: 0000000000000003
RBP: ffff888144d8c5d0 R08: fffffffffffff000 R09: ffff88801320f527
R10: ffffffff88e6a41c R11: 000000000000003f R12: fffffffffffffffc
R13: ffff888144d8c640 R14: ffff888144d8c5e8 R15: ffff888034c01500
FS:  00007fbff523d700(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000004b4942 CR3: 0000000016adb000 CR4: 00000000001506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 dev_attr_store+0x50/0x80 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/drivers/base/core.c:1936
 sysfs_kf_write+0x110/0x160 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/fs/sysfs/file.c:139
 kernfs_fop_write_iter+0x342/0x500 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/fs/kernfs/file.c:296
 call_write_iter syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/./include/linux/fs.h:1977 [inline]
 new_sync_write+0x426/0x650 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/fs/read_write.c:519
 vfs_write+0x791/0xa30 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/fs/read_write.c:606
 ksys_write+0x12d/0x250 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/fs/read_write.c:659
 do_syscall_64+0x2d/0x70 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x40a52f
Code: 89 54 24 18 48 89 74 24 10 89 7c 24 08 e8 99 fd ff ff 48 8b 54 24 18 48 8b 74 24 10 41 89 c0 8b 7c 24 08 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 31 44 89 c7 48 89 44 24 08 e8 cc fd ff ff 48
RSP: 002b:00007fbff523cc60 EFLAGS: 00000293 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000000000000008 RCX: 000000000040a52f
RDX: 0000000000000008 RSI: 00007fbff523ccb0 RDI: 0000000000000005
RBP: 0000000000000005 R08: 0000000000000000 R09: 00007fbff523cc00
R10: 0000000000000000 R11: 0000000000000293 R12: 00007fbff523ccb0
R13: 0000000000000000 R14: 00007fbff523d300 R15: 0000000000022000
Modules linked in:
---[ end trace 7a11e091a6d7a5b7 ]---
RIP: 0010:attach_store.cold+0x376/0x396 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/drivers/usb/usbip/vhci_sysfs.c:396
Code: e8 47 0d d0 f8 48 8b 5d 70 48 c7 c7 00 f0 ff ff 48 89 de e8 b4 50 8c f8 48 81 fb 00 f0 ff ff 0f 87 56 ff ff ff e8 b2 48 8c f8 <0f> 0b e8 ab 48 8c f8 8b b4 24 90 00 00 00 48 89 ef e8 5c ff b3 fc
RSP: 0018:ffffc9000171fb58 EFLAGS: 00010293
RAX: 0000000000000000 RBX: ffff888020641c00 RCX: 0000000000000000
RDX: ffff8880141db800 RSI: ffffffff88e6a42e RDI: 0000000000000003
RBP: ffff888144d8c5d0 R08: fffffffffffff000 R09: ffff88801320f527
R10: ffffffff88e6a41c R11: 000000000000003f R12: fffffffffffffffc
R13: ffff888144d8c640 R14: ffff888144d8c5e8 R15: ffff888034c01500
FS:  00007fbff523d700(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000004d2b34 CR3: 0000000016adb000 CR4: 00000000001506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400