Hello,
syzbot has tested the proposed patch but the reproducer still triggered
crash:
WARNING in usb_submit_urb
hub 3-0:1.0: 0000000015733366 hub_activate type 4 discon 0
hub 3-0:1.0: 0000000015733366 Submitting status URB
hub 3-0:1.0: 0000000015733366 Submitting status URB
------------[ cut here ]------------
URB 000000006ea6e83c submitted while active
WARNING: CPU: 0 PID: 6476 at drivers/usb/core/urb.c:363
usb_submit_urb+0x1110/0x1400 drivers/usb/core/urb.c:363
Kernel panic - not syncing: panic_on_warn set ...
CPU: 0 PID: 6476 Comm: kworker/0:3 Not tainted 4.20.0-rc1+ #1
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
Workqueue: events_power_efficient hub_init_func2
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x253/0x3bb lib/dump_stack.c:113
panic+0x2cb/0x586 kernel/panic.c:188
__warn.cold+0x20/0x4e kernel/panic.c:540
report_bug+0x263/0x2b0 lib/bug.c:186
fixup_bug arch/x86/kernel/traps.c:178 [inline]
fixup_bug arch/x86/kernel/traps.c:173 [inline]
do_error_trap+0x11b/0x200 arch/x86/kernel/traps.c:271
do_invalid_op+0x37/0x50 arch/x86/kernel/traps.c:290
invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:969
RIP: 0010:usb_submit_urb+0x1110/0x1400 drivers/usb/core/urb.c:363
Code: 89 de e8 d3 21 7d fc 84 db 0f 85 fe f5 ff ff e8 86 20 7d fc 4c 89 fe
48 c7 c7 00 49 93 88 c6 05 d3 1b 10 05 01 e8 60 95 46 fc <0f> 0b e9 dc f5
ff ff c7 45 c8 01 00 00 00 e9 94 f6 ff ff 41 be ed
RSP: 0018:ffff8881c397f820 EFLAGS: 00010286
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff81656e66 RDI: 0000000000000005
RBP: ffff8881c397f880 R08: ffff8881b82185c0 R09: ffff8881b8218e88
R10: ffff8881b82185c0 R11: 0000000000000000 R12: ffff8881c397f9a0
R13: ffff8881cdf73b10 R14: 00000000fffffff0 R15: ffff8881d507d700
hub_activate+0xcef/0x19f0 drivers/usb/core/hub.c:1219
hub_init_func2+0x1e/0x30 drivers/usb/core/hub.c:1244
process_one_work+0xd0c/0x1ce0 kernel/workqueue.c:2153
worker_thread+0x143/0x14a0 kernel/workqueue.c:2296
kthread+0x357/0x430 kernel/kthread.c:246
ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352
Kernel Offset: disabled
Rebooting in 86400 seconds..
Tested on:
commit: e12e00e3 Merge tag 'kbuild-fixes-v4.20' of git://git.kerne..
git tree:
git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
console output: https://syzkaller.appspot.com/x/log.txt?x=166b19b7200000
kernel config: https://syzkaller.appspot.com/x/.config?x=69667e62a5e247a7
compiler: gcc (GCC) 9.0.0 20181231 (experimental)
patch: https://syzkaller.appspot.com/x/patch.diff?x=144ac55b200000
