[syzbot] [kernel?] possible deadlock in device_create (2)
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syzbot
8:57 AM (9 hours ago) 8:57 AM
to da...@kernel.org, gre...@linuxfoundation.org, linux-...@vger.kernel.org, raf...@kernel.org, syzkall...@googlegroups.com
Hello,
syzbot found the following issue on:
HEAD commit: 88cbd8ac379c Add linux-next specific files for 20251120
git tree: linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=12cbba12580000
kernel config: https://syzkaller.appspot.com/x/.config?x=a8c4b5c6816f227d
dashboard link: https://syzkaller.appspot.com/bug?extid=e93eea510a0fc08f6805
compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/caaf2a62c9c1/disk-88cbd8ac.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/4172ec8ca062/vmlinux-88cbd8ac.xz
kernel image: https://storage.googleapis.com/syzbot-assets/bee849e7df9a/bzImage-88cbd8ac.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+e93eea...@syzkaller.appspotmail.com
cdc_mbim 1-1:1.0: setting tx_max = 184
cdc_mbim 1-1:1.0: cdc-wdm0: USB WDM device
======================================================
WARNING: possible circular locking dependency detected
syzkaller #0 Not tainted
------------------------------------------------------
kworker/1:6/5950 is trying to acquire lock:
ffffffff8e448520 (fs_reclaim){+.+.}-{0:0}, at: might_alloc include/linux/sched/mm.h:317 [inline]
ffffffff8e448520 (fs_reclaim){+.+.}-{0:0}, at: slab_pre_alloc_hook mm/slub.c:4899 [inline]
ffffffff8e448520 (fs_reclaim){+.+.}-{0:0}, at: slab_alloc_node mm/slub.c:5234 [inline]
ffffffff8e448520 (fs_reclaim){+.+.}-{0:0}, at: __kmalloc_cache_noprof+0x40/0x700 mm/slub.c:5766
but task is already holding lock:
ffffffff8ecda808 (gdp_mutex){+.+.}-{4:4}, at: get_device_parent+0x16f/0x3a0 drivers/base/core.c:3322
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #7 (gdp_mutex){+.+.}-{4:4}:
lock_acquire+0x117/0x350 kernel/locking/lockdep.c:5868
__mutex_lock_common kernel/locking/mutex.c:608 [inline]
__mutex_lock+0x187/0x1350 kernel/locking/mutex.c:770
get_device_parent+0x16f/0x3a0 drivers/base/core.c:3322
device_add+0x2e1/0xb80 drivers/base/core.c:3669
device_create_groups_vargs drivers/base/core.c:4427 [inline]
device_create+0x25b/0x2f0 drivers/base/core.c:4466
msr_device_create+0x33/0x50 arch/x86/kernel/msr.c:251
cpuhp_invoke_callback+0x445/0x860 kernel/cpu.c:195
cpuhp_thread_fun+0x3f4/0x850 kernel/cpu.c:1105
smpboot_thread_fn+0x542/0xa60 kernel/smpboot.c:160
kthread+0x711/0x8a0 kernel/kthread.c:463
ret_from_fork+0x599/0xb30 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
-> #6 (cpuhp_state-up){+.+.}-{0:0}:
lock_acquire+0x117/0x350 kernel/locking/lockdep.c:5868
cpuhp_lock_acquire kernel/cpu.c:104 [inline]
cpuhp_thread_fun+0x182/0x850 kernel/cpu.c:1082
smpboot_thread_fn+0x542/0xa60 kernel/smpboot.c:160
kthread+0x711/0x8a0 kernel/kthread.c:463
ret_from_fork+0x599/0xb30 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
-> #5 (cpu_hotplug_lock){++++}-{0:0}:
lock_acquire+0x117/0x350 kernel/locking/lockdep.c:5868
percpu_down_read_internal include/linux/percpu-rwsem.h:53 [inline]
percpu_down_read include/linux/percpu-rwsem.h:77 [inline]
cpus_read_lock+0x42/0x160 kernel/cpu.c:491
static_key_slow_inc+0x12/0x30 kernel/jump_label.c:190
nbd_reconnect_socket drivers/block/nbd.c:1342 [inline]
nbd_genl_reconfigure+0x10d8/0x1a50 drivers/block/nbd.c:2431
genl_family_rcv_msg_doit+0x215/0x300 net/netlink/genetlink.c:1115
genl_family_rcv_msg net/netlink/genetlink.c:1195 [inline]
genl_rcv_msg+0x60e/0x790 net/netlink/genetlink.c:1210
netlink_rcv_skb+0x208/0x470 net/netlink/af_netlink.c:2550
genl_rcv+0x28/0x40 net/netlink/genetlink.c:1219
netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline]
netlink_unicast+0x82f/0x9e0 net/netlink/af_netlink.c:1344
netlink_sendmsg+0x805/0xb30 net/netlink/af_netlink.c:1894
sock_sendmsg_nosec net/socket.c:727 [inline]
__sock_sendmsg+0x21c/0x270 net/socket.c:746
____sys_sendmsg+0x505/0x870 net/socket.c:2634
___sys_sendmsg+0x21f/0x2a0 net/socket.c:2688
__sys_sendmsg net/socket.c:2720 [inline]
__do_sys_sendmsg net/socket.c:2725 [inline]
__se_sys_sendmsg net/socket.c:2723 [inline]
__x64_sys_sendmsg+0x19b/0x260 net/socket.c:2723
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
-> #4 (&nsock->tx_lock){+.+.}-{4:4}:
lock_acquire+0x117/0x350 kernel/locking/lockdep.c:5868
__mutex_lock_common kernel/locking/mutex.c:608 [inline]
__mutex_lock+0x187/0x1350 kernel/locking/mutex.c:770
nbd_handle_cmd drivers/block/nbd.c:1143 [inline]
nbd_queue_rq+0x257/0xf10 drivers/block/nbd.c:1207
blk_mq_dispatch_rq_list+0x4c0/0x1900 block/blk-mq.c:2137
__blk_mq_do_dispatch_sched block/blk-mq-sched.c:168 [inline]
blk_mq_do_dispatch_sched block/blk-mq-sched.c:182 [inline]
__blk_mq_sched_dispatch_requests+0xdac/0x1570 block/blk-mq-sched.c:307
blk_mq_sched_dispatch_requests+0xd7/0x190 block/blk-mq-sched.c:329
blk_mq_run_hw_queue+0x348/0x4f0 block/blk-mq.c:2375
blk_mq_dispatch_list+0xd0c/0xe00 include/linux/spinlock.h:-1
blk_mq_flush_plug_list+0x469/0x550 block/blk-mq.c:2986
__blk_flush_plug+0x3d3/0x4b0 block/blk-core.c:1225
blk_finish_plug block/blk-core.c:1252 [inline]
__submit_bio+0x2d3/0x5a0 block/blk-core.c:651
__submit_bio_noacct_mq block/blk-core.c:724 [inline]
submit_bio_noacct_nocheck+0x2eb/0xa50 block/blk-core.c:755
submit_bh fs/buffer.c:2829 [inline]
block_read_full_folio+0x599/0x830 fs/buffer.c:2447
filemap_read_folio+0x117/0x380 mm/filemap.c:2496
do_read_cache_folio+0x358/0x590 mm/filemap.c:4095
read_mapping_folio include/linux/pagemap.h:1017 [inline]
read_part_sector+0xb6/0x2b0 block/partitions/core.c:722
adfspart_check_ICS+0xa4/0xa50 block/partitions/acorn.c:360
check_partition block/partitions/core.c:141 [inline]
blk_add_partitions block/partitions/core.c:589 [inline]
bdev_disk_changed+0x75f/0x14b0 block/partitions/core.c:693
blkdev_get_whole+0x380/0x510 block/bdev.c:765
bdev_open+0x31e/0xd30 block/bdev.c:974
blkdev_open+0x457/0x600 block/fops.c:703
do_dentry_open+0x7ce/0x1420 fs/open.c:962
vfs_open+0x3b/0x340 fs/open.c:1094
do_open fs/namei.c:4597 [inline]
path_openat+0x33ce/0x3d90 fs/namei.c:4756
do_filp_open+0x1fa/0x410 fs/namei.c:4783
do_sys_openat2+0x121/0x1c0 fs/open.c:1432
do_sys_open fs/open.c:1447 [inline]
__do_sys_openat fs/open.c:1463 [inline]
__se_sys_openat fs/open.c:1458 [inline]
__x64_sys_openat+0x138/0x170 fs/open.c:1458
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
-> #3 (&cmd->lock){+.+.}-{4:4}:
lock_acquire+0x117/0x350 kernel/locking/lockdep.c:5868
__mutex_lock_common kernel/locking/mutex.c:608 [inline]
__mutex_lock+0x187/0x1350 kernel/locking/mutex.c:770
nbd_queue_rq+0xc8/0xf10 drivers/block/nbd.c:1199
blk_mq_dispatch_rq_list+0x4c0/0x1900 block/blk-mq.c:2137
__blk_mq_do_dispatch_sched block/blk-mq-sched.c:168 [inline]
blk_mq_do_dispatch_sched block/blk-mq-sched.c:182 [inline]
__blk_mq_sched_dispatch_requests+0xdac/0x1570 block/blk-mq-sched.c:307
blk_mq_sched_dispatch_requests+0xd7/0x190 block/blk-mq-sched.c:329
blk_mq_run_hw_queue+0x348/0x4f0 block/blk-mq.c:2375
blk_mq_dispatch_list+0xd0c/0xe00 include/linux/spinlock.h:-1
blk_mq_flush_plug_list+0x469/0x550 block/blk-mq.c:2986
__blk_flush_plug+0x3d3/0x4b0 block/blk-core.c:1225
blk_finish_plug block/blk-core.c:1252 [inline]
__submit_bio+0x2d3/0x5a0 block/blk-core.c:651
__submit_bio_noacct_mq block/blk-core.c:724 [inline]
submit_bio_noacct_nocheck+0x2eb/0xa50 block/blk-core.c:755
submit_bh fs/buffer.c:2829 [inline]
block_read_full_folio+0x599/0x830 fs/buffer.c:2447
filemap_read_folio+0x117/0x380 mm/filemap.c:2496
do_read_cache_folio+0x358/0x590 mm/filemap.c:4095
read_mapping_folio include/linux/pagemap.h:1017 [inline]
read_part_sector+0xb6/0x2b0 block/partitions/core.c:722
adfspart_check_ICS+0xa4/0xa50 block/partitions/acorn.c:360
check_partition block/partitions/core.c:141 [inline]
blk_add_partitions block/partitions/core.c:589 [inline]
bdev_disk_changed+0x75f/0x14b0 block/partitions/core.c:693
blkdev_get_whole+0x380/0x510 block/bdev.c:765
bdev_open+0x31e/0xd30 block/bdev.c:974
blkdev_open+0x457/0x600 block/fops.c:703
do_dentry_open+0x7ce/0x1420 fs/open.c:962
vfs_open+0x3b/0x340 fs/open.c:1094
do_open fs/namei.c:4597 [inline]
path_openat+0x33ce/0x3d90 fs/namei.c:4756
do_filp_open+0x1fa/0x410 fs/namei.c:4783
do_sys_openat2+0x121/0x1c0 fs/open.c:1432
do_sys_open fs/open.c:1447 [inline]
__do_sys_openat fs/open.c:1463 [inline]
__se_sys_openat fs/open.c:1458 [inline]
__x64_sys_openat+0x138/0x170 fs/open.c:1458
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
-> #2 (set->srcu){.+.?}-{0:0}:
lock_sync+0xba/0x160 kernel/locking/lockdep.c:5916
srcu_lock_sync include/linux/srcu.h:197 [inline]
__synchronize_srcu+0x96/0x3a0 kernel/rcu/srcutree.c:1503
blk_throtl_init+0x298/0x410 block/blk-throttle.c:1324
tg_set_conf+0x1c6/0x4b0 block/blk-throttle.c:1359
cgroup_file_write+0x3a1/0x740 kernel/cgroup/cgroup.c:4312
kernfs_fop_write_iter+0x3af/0x540 fs/kernfs/file.c:352
new_sync_write fs/read_write.c:593 [inline]
vfs_write+0x5c9/0xb30 fs/read_write.c:686
ksys_write+0x145/0x250 fs/read_write.c:738
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
-> #1 (&q->q_usage_counter(io)#17){++++}-{0:0}:
lock_acquire+0x117/0x350 kernel/locking/lockdep.c:5868
blk_alloc_queue+0x538/0x620 block/blk-core.c:461
blk_mq_alloc_queue block/blk-mq.c:4410 [inline]
__blk_mq_alloc_disk+0x15c/0x340 block/blk-mq.c:4457
loop_add+0x411/0xad0 drivers/block/loop.c:2202
loop_init+0xd9/0x170 drivers/block/loop.c:2437
do_one_initcall+0x1fb/0x870 init/main.c:1378
do_initcall_level+0x104/0x190 init/main.c:1440
do_initcalls+0x59/0xa0 init/main.c:1456
kernel_init_freeable+0x334/0x4b0 init/main.c:1688
kernel_init+0x1d/0x1d0 init/main.c:1578
ret_from_fork+0x599/0xb30 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
-> #0 (fs_reclaim){+.+.}-{0:0}:
check_prev_add kernel/locking/lockdep.c:3165 [inline]
check_prevs_add kernel/locking/lockdep.c:3284 [inline]
validate_chain+0xb9b/0x2130 kernel/locking/lockdep.c:3908
__lock_acquire+0xab9/0xd20 kernel/locking/lockdep.c:5237
lock_acquire+0x117/0x350 kernel/locking/lockdep.c:5868
__fs_reclaim_acquire mm/page_alloc.c:4301 [inline]
fs_reclaim_acquire+0x72/0x100 mm/page_alloc.c:4315
might_alloc include/linux/sched/mm.h:317 [inline]
slab_pre_alloc_hook mm/slub.c:4899 [inline]
slab_alloc_node mm/slub.c:5234 [inline]
__kmalloc_cache_noprof+0x40/0x700 mm/slub.c:5766
kmalloc_noprof include/linux/slab.h:957 [inline]
kzalloc_noprof include/linux/slab.h:1094 [inline]
class_dir_create_and_add drivers/base/core.c:3279 [inline]
get_device_parent+0x255/0x3a0 drivers/base/core.c:3339
device_add+0x2e1/0xb80 drivers/base/core.c:3669
wwan_create_dev+0x15a/0x1f0 drivers/net/wwan/wwan_core.c:249
wwan_create_port+0xe0/0xa20 drivers/net/wwan/wwan_core.c:462
wdm_wwan_init+0x80/0x180 drivers/usb/class/cdc-wdm.c:938
wdm_create+0x12be/0x1720 drivers/usb/class/cdc-wdm.c:1125
usb_cdc_wdm_register+0x33/0x60 drivers/usb/class/cdc-wdm.c:1205
cdc_mbim_bind+0x3e1/0x640 drivers/net/usb/cdc_mbim.c:169
usbnet_probe+0xab5/0x28f0 drivers/net/usb/usbnet.c:1802
usb_probe_interface+0x668/0xc90 drivers/usb/core/driver.c:396
call_driver_probe drivers/base/dd.c:-1 [inline]
really_probe+0x26d/0xad0 drivers/base/dd.c:659
__driver_probe_device+0x18c/0x320 drivers/base/dd.c:801
driver_probe_device+0x4f/0x240 drivers/base/dd.c:831
__device_attach_driver+0x279/0x430 drivers/base/dd.c:959
bus_for_each_drv+0x251/0x2e0 drivers/base/bus.c:500
__device_attach+0x2b8/0x430 drivers/base/dd.c:1031
bus_probe_device+0x185/0x260 drivers/base/bus.c:575
device_add+0x7b6/0xb80 drivers/base/core.c:3745
usb_set_configuration+0x1a87/0x2110 drivers/usb/core/message.c:2210
usb_generic_driver_probe+0x8d/0x150 drivers/usb/core/generic.c:250
usb_probe_device+0x1c4/0x3c0 drivers/usb/core/driver.c:291
call_driver_probe drivers/base/dd.c:-1 [inline]
really_probe+0x26d/0xad0 drivers/base/dd.c:659
__driver_probe_device+0x18c/0x320 drivers/base/dd.c:801
driver_probe_device+0x4f/0x240 drivers/base/dd.c:831
__device_attach_driver+0x279/0x430 drivers/base/dd.c:959
bus_for_each_drv+0x251/0x2e0 drivers/base/bus.c:500
__device_attach+0x2b8/0x430 drivers/base/dd.c:1031
bus_probe_device+0x185/0x260 drivers/base/bus.c:575
device_add+0x7b6/0xb80 drivers/base/core.c:3745
usb_new_device+0xa39/0x1720 drivers/usb/core/hub.c:2695
hub_port_connect drivers/usb/core/hub.c:5567 [inline]
hub_port_connect_change drivers/usb/core/hub.c:5707 [inline]
port_event drivers/usb/core/hub.c:5871 [inline]
hub_event+0x29b1/0x4ef0 drivers/usb/core/hub.c:5953
process_one_work+0x93a/0x15e0 kernel/workqueue.c:3261
process_scheduled_works kernel/workqueue.c:3344 [inline]
worker_thread+0x9b0/0xee0 kernel/workqueue.c:3425
kthread+0x711/0x8a0 kernel/kthread.c:463
ret_from_fork+0x599/0xb30 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
other info that might help us debug this:
Chain exists of:
fs_reclaim --> cpuhp_state-up --> gdp_mutex
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(gdp_mutex);
lock(cpuhp_state-up);
lock(gdp_mutex);
lock(fs_reclaim);
*** DEADLOCK ***
7 locks held by kworker/1:6/5950:
#0: ffff8880202a3d48 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work+0x841/0x15e0 kernel/workqueue.c:3236
#1: ffffc900046bfb80 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work+0x868/0x15e0 kernel/workqueue.c:3237
#2: ffff88802896d198 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:914 [inline]
#2: ffff88802896d198 (&dev->mutex){....}-{4:4}, at: hub_event+0x187/0x4ef0 drivers/usb/core/hub.c:5899
#3: ffff88807f14d198 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:914 [inline]
#3: ffff88807f14d198 (&dev->mutex){....}-{4:4}, at: __device_attach+0x88/0x430 drivers/base/dd.c:1006
#4: ffff88806b989160 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:914 [inline]
#4: ffff88806b989160 (&dev->mutex){....}-{4:4}, at: __device_attach+0x88/0x430 drivers/base/dd.c:1006
#5: ffffffff8ef587e8 (wwan_register_lock){+.+.}-{4:4}, at: wwan_create_dev+0x1c/0x1f0 drivers/net/wwan/wwan_core.c:223
#6: ffffffff8ecda808 (gdp_mutex){+.+.}-{4:4}, at: get_device_parent+0x16f/0x3a0 drivers/base/core.c:3322
stack backtrace:
CPU: 1 UID: 0 PID: 5950 Comm: kworker/1:6 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Workqueue: usb_hub_wq hub_event
Call Trace:
<TASK>
dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
print_circular_bug+0x2ee/0x310 kernel/locking/lockdep.c:2043
check_noncircular+0x134/0x160 kernel/locking/lockdep.c:2175
check_prev_add kernel/locking/lockdep.c:3165 [inline]
check_prevs_add kernel/locking/lockdep.c:3284 [inline]
validate_chain+0xb9b/0x2130 kernel/locking/lockdep.c:3908
__lock_acquire+0xab9/0xd20 kernel/locking/lockdep.c:5237
lock_acquire+0x117/0x350 kernel/locking/lockdep.c:5868
__fs_reclaim_acquire mm/page_alloc.c:4301 [inline]
fs_reclaim_acquire+0x72/0x100 mm/page_alloc.c:4315
might_alloc include/linux/sched/mm.h:317 [inline]
slab_pre_alloc_hook mm/slub.c:4899 [inline]
slab_alloc_node mm/slub.c:5234 [inline]
__kmalloc_cache_noprof+0x40/0x700 mm/slub.c:5766
kmalloc_noprof include/linux/slab.h:957 [inline]
kzalloc_noprof include/linux/slab.h:1094 [inline]
class_dir_create_and_add drivers/base/core.c:3279 [inline]
get_device_parent+0x255/0x3a0 drivers/base/core.c:3339
device_add+0x2e1/0xb80 drivers/base/core.c:3669
wwan_create_dev+0x15a/0x1f0 drivers/net/wwan/wwan_core.c:249
wwan_create_port+0xe0/0xa20 drivers/net/wwan/wwan_core.c:462
wdm_wwan_init+0x80/0x180 drivers/usb/class/cdc-wdm.c:938
wdm_create+0x12be/0x1720 drivers/usb/class/cdc-wdm.c:1125
usb_cdc_wdm_register+0x33/0x60 drivers/usb/class/cdc-wdm.c:1205
cdc_mbim_bind+0x3e1/0x640 drivers/net/usb/cdc_mbim.c:169
usbnet_probe+0xab5/0x28f0 drivers/net/usb/usbnet.c:1802
usb_probe_interface+0x668/0xc90 drivers/usb/core/driver.c:396
call_driver_probe drivers/base/dd.c:-1 [inline]
really_probe+0x26d/0xad0 drivers/base/dd.c:659
__driver_probe_device+0x18c/0x320 drivers/base/dd.c:801
driver_probe_device+0x4f/0x240 drivers/base/dd.c:831
__device_attach_driver+0x279/0x430 drivers/base/dd.c:959
bus_for_each_drv+0x251/0x2e0 drivers/base/bus.c:500
__device_attach+0x2b8/0x430 drivers/base/dd.c:1031
bus_probe_device+0x185/0x260 drivers/base/bus.c:575
device_add+0x7b6/0xb80 drivers/base/core.c:3745
usb_set_configuration+0x1a87/0x2110 drivers/usb/core/message.c:2210
usb_generic_driver_probe+0x8d/0x150 drivers/usb/core/generic.c:250
usb_probe_device+0x1c4/0x3c0 drivers/usb/core/driver.c:291
call_driver_probe drivers/base/dd.c:-1 [inline]
really_probe+0x26d/0xad0 drivers/base/dd.c:659
__driver_probe_device+0x18c/0x320 drivers/base/dd.c:801
driver_probe_device+0x4f/0x240 drivers/base/dd.c:831
__device_attach_driver+0x279/0x430 drivers/base/dd.c:959
bus_for_each_drv+0x251/0x2e0 drivers/base/bus.c:500
__device_attach+0x2b8/0x430 drivers/base/dd.c:1031
bus_probe_device+0x185/0x260 drivers/base/bus.c:575
device_add+0x7b6/0xb80 drivers/base/core.c:3745
usb_new_device+0xa39/0x1720 drivers/usb/core/hub.c:2695
hub_port_connect drivers/usb/core/hub.c:5567 [inline]
hub_port_connect_change drivers/usb/core/hub.c:5707 [inline]
port_event drivers/usb/core/hub.c:5871 [inline]
hub_event+0x29b1/0x4ef0 drivers/usb/core/hub.c:5953
process_one_work+0x93a/0x15e0 kernel/workqueue.c:3261
process_scheduled_works kernel/workqueue.c:3344 [inline]
worker_thread+0x9b0/0xee0 kernel/workqueue.c:3425
kthread+0x711/0x8a0 kernel/kthread.c:463
ret_from_fork+0x599/0xb30 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
</TASK>
wwan wwan0: port wwan0mbim0 attached
cdc_mbim 1-1:1.0 wwan0: register 'cdc_mbim' at usb-dummy_hcd.0-1, CDC MBIM, b6:b8:b8:38:29:fc
usb 1-1: USB disconnect, device number 89
cdc_mbim 1-1:1.0 wwan0: unregister 'cdc_mbim' usb-dummy_hcd.0-1, CDC MBIM
wwan wwan0: port wwan0mbim0 disconnected
usb 1-1: new full-speed USB device number 90 using dummy_hcd
usb 1-1: New USB device found, idVendor=0ccd, idProduct=00b3, bcdDevice=2d.ea
usb 1-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
usb 1-1: Product: syz
usb 1-1: Manufacturer: syz
usb 1-1: SerialNumber: syz
usb 1-1: config 0 descriptor??
usb 1-1: dvb_usb_v2: found a 'TerraTec NOXON DAB Stick' in warm state
dvb_usb_rtl28xxu 1-1:0.0: probe with driver dvb_usb_rtl28xxu failed with error -71
usb 1-1: USB disconnect, device number 90
---
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syzbot found the following issue on:
HEAD commit: 88cbd8ac379c Add linux-next specific files for 20251120
git tree: linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=12cbba12580000
kernel config: https://syzkaller.appspot.com/x/.config?x=a8c4b5c6816f227d
dashboard link: https://syzkaller.appspot.com/bug?extid=e93eea510a0fc08f6805
compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/caaf2a62c9c1/disk-88cbd8ac.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/4172ec8ca062/vmlinux-88cbd8ac.xz
kernel image: https://storage.googleapis.com/syzbot-assets/bee849e7df9a/bzImage-88cbd8ac.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+e93eea...@syzkaller.appspotmail.com
cdc_mbim 1-1:1.0: setting tx_max = 184
cdc_mbim 1-1:1.0: cdc-wdm0: USB WDM device
======================================================
WARNING: possible circular locking dependency detected
syzkaller #0 Not tainted
------------------------------------------------------
kworker/1:6/5950 is trying to acquire lock:
ffffffff8e448520 (fs_reclaim){+.+.}-{0:0}, at: might_alloc include/linux/sched/mm.h:317 [inline]
ffffffff8e448520 (fs_reclaim){+.+.}-{0:0}, at: slab_pre_alloc_hook mm/slub.c:4899 [inline]
ffffffff8e448520 (fs_reclaim){+.+.}-{0:0}, at: slab_alloc_node mm/slub.c:5234 [inline]
ffffffff8e448520 (fs_reclaim){+.+.}-{0:0}, at: __kmalloc_cache_noprof+0x40/0x700 mm/slub.c:5766
but task is already holding lock:
ffffffff8ecda808 (gdp_mutex){+.+.}-{4:4}, at: get_device_parent+0x16f/0x3a0 drivers/base/core.c:3322
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #7 (gdp_mutex){+.+.}-{4:4}:
lock_acquire+0x117/0x350 kernel/locking/lockdep.c:5868
__mutex_lock_common kernel/locking/mutex.c:608 [inline]
__mutex_lock+0x187/0x1350 kernel/locking/mutex.c:770
get_device_parent+0x16f/0x3a0 drivers/base/core.c:3322
device_add+0x2e1/0xb80 drivers/base/core.c:3669
device_create_groups_vargs drivers/base/core.c:4427 [inline]
device_create+0x25b/0x2f0 drivers/base/core.c:4466
msr_device_create+0x33/0x50 arch/x86/kernel/msr.c:251
cpuhp_invoke_callback+0x445/0x860 kernel/cpu.c:195
cpuhp_thread_fun+0x3f4/0x850 kernel/cpu.c:1105
smpboot_thread_fn+0x542/0xa60 kernel/smpboot.c:160
kthread+0x711/0x8a0 kernel/kthread.c:463
ret_from_fork+0x599/0xb30 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
-> #6 (cpuhp_state-up){+.+.}-{0:0}:
lock_acquire+0x117/0x350 kernel/locking/lockdep.c:5868
cpuhp_lock_acquire kernel/cpu.c:104 [inline]
cpuhp_thread_fun+0x182/0x850 kernel/cpu.c:1082
smpboot_thread_fn+0x542/0xa60 kernel/smpboot.c:160
kthread+0x711/0x8a0 kernel/kthread.c:463
ret_from_fork+0x599/0xb30 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
-> #5 (cpu_hotplug_lock){++++}-{0:0}:
lock_acquire+0x117/0x350 kernel/locking/lockdep.c:5868
percpu_down_read_internal include/linux/percpu-rwsem.h:53 [inline]
percpu_down_read include/linux/percpu-rwsem.h:77 [inline]
cpus_read_lock+0x42/0x160 kernel/cpu.c:491
static_key_slow_inc+0x12/0x30 kernel/jump_label.c:190
nbd_reconnect_socket drivers/block/nbd.c:1342 [inline]
nbd_genl_reconfigure+0x10d8/0x1a50 drivers/block/nbd.c:2431
genl_family_rcv_msg_doit+0x215/0x300 net/netlink/genetlink.c:1115
genl_family_rcv_msg net/netlink/genetlink.c:1195 [inline]
genl_rcv_msg+0x60e/0x790 net/netlink/genetlink.c:1210
netlink_rcv_skb+0x208/0x470 net/netlink/af_netlink.c:2550
genl_rcv+0x28/0x40 net/netlink/genetlink.c:1219
netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline]
netlink_unicast+0x82f/0x9e0 net/netlink/af_netlink.c:1344
netlink_sendmsg+0x805/0xb30 net/netlink/af_netlink.c:1894
sock_sendmsg_nosec net/socket.c:727 [inline]
__sock_sendmsg+0x21c/0x270 net/socket.c:746
____sys_sendmsg+0x505/0x870 net/socket.c:2634
___sys_sendmsg+0x21f/0x2a0 net/socket.c:2688
__sys_sendmsg net/socket.c:2720 [inline]
__do_sys_sendmsg net/socket.c:2725 [inline]
__se_sys_sendmsg net/socket.c:2723 [inline]
__x64_sys_sendmsg+0x19b/0x260 net/socket.c:2723
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
-> #4 (&nsock->tx_lock){+.+.}-{4:4}:
lock_acquire+0x117/0x350 kernel/locking/lockdep.c:5868
__mutex_lock_common kernel/locking/mutex.c:608 [inline]
__mutex_lock+0x187/0x1350 kernel/locking/mutex.c:770
nbd_handle_cmd drivers/block/nbd.c:1143 [inline]
nbd_queue_rq+0x257/0xf10 drivers/block/nbd.c:1207
blk_mq_dispatch_rq_list+0x4c0/0x1900 block/blk-mq.c:2137
__blk_mq_do_dispatch_sched block/blk-mq-sched.c:168 [inline]
blk_mq_do_dispatch_sched block/blk-mq-sched.c:182 [inline]
__blk_mq_sched_dispatch_requests+0xdac/0x1570 block/blk-mq-sched.c:307
blk_mq_sched_dispatch_requests+0xd7/0x190 block/blk-mq-sched.c:329
blk_mq_run_hw_queue+0x348/0x4f0 block/blk-mq.c:2375
blk_mq_dispatch_list+0xd0c/0xe00 include/linux/spinlock.h:-1
blk_mq_flush_plug_list+0x469/0x550 block/blk-mq.c:2986
__blk_flush_plug+0x3d3/0x4b0 block/blk-core.c:1225
blk_finish_plug block/blk-core.c:1252 [inline]
__submit_bio+0x2d3/0x5a0 block/blk-core.c:651
__submit_bio_noacct_mq block/blk-core.c:724 [inline]
submit_bio_noacct_nocheck+0x2eb/0xa50 block/blk-core.c:755
submit_bh fs/buffer.c:2829 [inline]
block_read_full_folio+0x599/0x830 fs/buffer.c:2447
filemap_read_folio+0x117/0x380 mm/filemap.c:2496
do_read_cache_folio+0x358/0x590 mm/filemap.c:4095
read_mapping_folio include/linux/pagemap.h:1017 [inline]
read_part_sector+0xb6/0x2b0 block/partitions/core.c:722
adfspart_check_ICS+0xa4/0xa50 block/partitions/acorn.c:360
check_partition block/partitions/core.c:141 [inline]
blk_add_partitions block/partitions/core.c:589 [inline]
bdev_disk_changed+0x75f/0x14b0 block/partitions/core.c:693
blkdev_get_whole+0x380/0x510 block/bdev.c:765
bdev_open+0x31e/0xd30 block/bdev.c:974
blkdev_open+0x457/0x600 block/fops.c:703
do_dentry_open+0x7ce/0x1420 fs/open.c:962
vfs_open+0x3b/0x340 fs/open.c:1094
do_open fs/namei.c:4597 [inline]
path_openat+0x33ce/0x3d90 fs/namei.c:4756
do_filp_open+0x1fa/0x410 fs/namei.c:4783
do_sys_openat2+0x121/0x1c0 fs/open.c:1432
do_sys_open fs/open.c:1447 [inline]
__do_sys_openat fs/open.c:1463 [inline]
__se_sys_openat fs/open.c:1458 [inline]
__x64_sys_openat+0x138/0x170 fs/open.c:1458
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
-> #3 (&cmd->lock){+.+.}-{4:4}:
lock_acquire+0x117/0x350 kernel/locking/lockdep.c:5868
__mutex_lock_common kernel/locking/mutex.c:608 [inline]
__mutex_lock+0x187/0x1350 kernel/locking/mutex.c:770
nbd_queue_rq+0xc8/0xf10 drivers/block/nbd.c:1199
blk_mq_dispatch_rq_list+0x4c0/0x1900 block/blk-mq.c:2137
__blk_mq_do_dispatch_sched block/blk-mq-sched.c:168 [inline]
blk_mq_do_dispatch_sched block/blk-mq-sched.c:182 [inline]
__blk_mq_sched_dispatch_requests+0xdac/0x1570 block/blk-mq-sched.c:307
blk_mq_sched_dispatch_requests+0xd7/0x190 block/blk-mq-sched.c:329
blk_mq_run_hw_queue+0x348/0x4f0 block/blk-mq.c:2375
blk_mq_dispatch_list+0xd0c/0xe00 include/linux/spinlock.h:-1
blk_mq_flush_plug_list+0x469/0x550 block/blk-mq.c:2986
__blk_flush_plug+0x3d3/0x4b0 block/blk-core.c:1225
blk_finish_plug block/blk-core.c:1252 [inline]
__submit_bio+0x2d3/0x5a0 block/blk-core.c:651
__submit_bio_noacct_mq block/blk-core.c:724 [inline]
submit_bio_noacct_nocheck+0x2eb/0xa50 block/blk-core.c:755
submit_bh fs/buffer.c:2829 [inline]
block_read_full_folio+0x599/0x830 fs/buffer.c:2447
filemap_read_folio+0x117/0x380 mm/filemap.c:2496
do_read_cache_folio+0x358/0x590 mm/filemap.c:4095
read_mapping_folio include/linux/pagemap.h:1017 [inline]
read_part_sector+0xb6/0x2b0 block/partitions/core.c:722
adfspart_check_ICS+0xa4/0xa50 block/partitions/acorn.c:360
check_partition block/partitions/core.c:141 [inline]
blk_add_partitions block/partitions/core.c:589 [inline]
bdev_disk_changed+0x75f/0x14b0 block/partitions/core.c:693
blkdev_get_whole+0x380/0x510 block/bdev.c:765
bdev_open+0x31e/0xd30 block/bdev.c:974
blkdev_open+0x457/0x600 block/fops.c:703
do_dentry_open+0x7ce/0x1420 fs/open.c:962
vfs_open+0x3b/0x340 fs/open.c:1094
do_open fs/namei.c:4597 [inline]
path_openat+0x33ce/0x3d90 fs/namei.c:4756
do_filp_open+0x1fa/0x410 fs/namei.c:4783
do_sys_openat2+0x121/0x1c0 fs/open.c:1432
do_sys_open fs/open.c:1447 [inline]
__do_sys_openat fs/open.c:1463 [inline]
__se_sys_openat fs/open.c:1458 [inline]
__x64_sys_openat+0x138/0x170 fs/open.c:1458
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
-> #2 (set->srcu){.+.?}-{0:0}:
lock_sync+0xba/0x160 kernel/locking/lockdep.c:5916
srcu_lock_sync include/linux/srcu.h:197 [inline]
__synchronize_srcu+0x96/0x3a0 kernel/rcu/srcutree.c:1503
blk_throtl_init+0x298/0x410 block/blk-throttle.c:1324
tg_set_conf+0x1c6/0x4b0 block/blk-throttle.c:1359
cgroup_file_write+0x3a1/0x740 kernel/cgroup/cgroup.c:4312
kernfs_fop_write_iter+0x3af/0x540 fs/kernfs/file.c:352
new_sync_write fs/read_write.c:593 [inline]
vfs_write+0x5c9/0xb30 fs/read_write.c:686
ksys_write+0x145/0x250 fs/read_write.c:738
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
-> #1 (&q->q_usage_counter(io)#17){++++}-{0:0}:
lock_acquire+0x117/0x350 kernel/locking/lockdep.c:5868
blk_alloc_queue+0x538/0x620 block/blk-core.c:461
blk_mq_alloc_queue block/blk-mq.c:4410 [inline]
__blk_mq_alloc_disk+0x15c/0x340 block/blk-mq.c:4457
loop_add+0x411/0xad0 drivers/block/loop.c:2202
loop_init+0xd9/0x170 drivers/block/loop.c:2437
do_one_initcall+0x1fb/0x870 init/main.c:1378
do_initcall_level+0x104/0x190 init/main.c:1440
do_initcalls+0x59/0xa0 init/main.c:1456
kernel_init_freeable+0x334/0x4b0 init/main.c:1688
kernel_init+0x1d/0x1d0 init/main.c:1578
ret_from_fork+0x599/0xb30 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
-> #0 (fs_reclaim){+.+.}-{0:0}:
check_prev_add kernel/locking/lockdep.c:3165 [inline]
check_prevs_add kernel/locking/lockdep.c:3284 [inline]
validate_chain+0xb9b/0x2130 kernel/locking/lockdep.c:3908
__lock_acquire+0xab9/0xd20 kernel/locking/lockdep.c:5237
lock_acquire+0x117/0x350 kernel/locking/lockdep.c:5868
__fs_reclaim_acquire mm/page_alloc.c:4301 [inline]
fs_reclaim_acquire+0x72/0x100 mm/page_alloc.c:4315
might_alloc include/linux/sched/mm.h:317 [inline]
slab_pre_alloc_hook mm/slub.c:4899 [inline]
slab_alloc_node mm/slub.c:5234 [inline]
__kmalloc_cache_noprof+0x40/0x700 mm/slub.c:5766
kmalloc_noprof include/linux/slab.h:957 [inline]
kzalloc_noprof include/linux/slab.h:1094 [inline]
class_dir_create_and_add drivers/base/core.c:3279 [inline]
get_device_parent+0x255/0x3a0 drivers/base/core.c:3339
device_add+0x2e1/0xb80 drivers/base/core.c:3669
wwan_create_dev+0x15a/0x1f0 drivers/net/wwan/wwan_core.c:249
wwan_create_port+0xe0/0xa20 drivers/net/wwan/wwan_core.c:462
wdm_wwan_init+0x80/0x180 drivers/usb/class/cdc-wdm.c:938
wdm_create+0x12be/0x1720 drivers/usb/class/cdc-wdm.c:1125
usb_cdc_wdm_register+0x33/0x60 drivers/usb/class/cdc-wdm.c:1205
cdc_mbim_bind+0x3e1/0x640 drivers/net/usb/cdc_mbim.c:169
usbnet_probe+0xab5/0x28f0 drivers/net/usb/usbnet.c:1802
usb_probe_interface+0x668/0xc90 drivers/usb/core/driver.c:396
call_driver_probe drivers/base/dd.c:-1 [inline]
really_probe+0x26d/0xad0 drivers/base/dd.c:659
__driver_probe_device+0x18c/0x320 drivers/base/dd.c:801
driver_probe_device+0x4f/0x240 drivers/base/dd.c:831
__device_attach_driver+0x279/0x430 drivers/base/dd.c:959
bus_for_each_drv+0x251/0x2e0 drivers/base/bus.c:500
__device_attach+0x2b8/0x430 drivers/base/dd.c:1031
bus_probe_device+0x185/0x260 drivers/base/bus.c:575
device_add+0x7b6/0xb80 drivers/base/core.c:3745
usb_set_configuration+0x1a87/0x2110 drivers/usb/core/message.c:2210
usb_generic_driver_probe+0x8d/0x150 drivers/usb/core/generic.c:250
usb_probe_device+0x1c4/0x3c0 drivers/usb/core/driver.c:291
call_driver_probe drivers/base/dd.c:-1 [inline]
really_probe+0x26d/0xad0 drivers/base/dd.c:659
__driver_probe_device+0x18c/0x320 drivers/base/dd.c:801
driver_probe_device+0x4f/0x240 drivers/base/dd.c:831
__device_attach_driver+0x279/0x430 drivers/base/dd.c:959
bus_for_each_drv+0x251/0x2e0 drivers/base/bus.c:500
__device_attach+0x2b8/0x430 drivers/base/dd.c:1031
bus_probe_device+0x185/0x260 drivers/base/bus.c:575
device_add+0x7b6/0xb80 drivers/base/core.c:3745
usb_new_device+0xa39/0x1720 drivers/usb/core/hub.c:2695
hub_port_connect drivers/usb/core/hub.c:5567 [inline]
hub_port_connect_change drivers/usb/core/hub.c:5707 [inline]
port_event drivers/usb/core/hub.c:5871 [inline]
hub_event+0x29b1/0x4ef0 drivers/usb/core/hub.c:5953
process_one_work+0x93a/0x15e0 kernel/workqueue.c:3261
process_scheduled_works kernel/workqueue.c:3344 [inline]
worker_thread+0x9b0/0xee0 kernel/workqueue.c:3425
kthread+0x711/0x8a0 kernel/kthread.c:463
ret_from_fork+0x599/0xb30 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
other info that might help us debug this:
Chain exists of:
fs_reclaim --> cpuhp_state-up --> gdp_mutex
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(gdp_mutex);
lock(cpuhp_state-up);
lock(gdp_mutex);
lock(fs_reclaim);
*** DEADLOCK ***
7 locks held by kworker/1:6/5950:
#0: ffff8880202a3d48 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work+0x841/0x15e0 kernel/workqueue.c:3236
#1: ffffc900046bfb80 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work+0x868/0x15e0 kernel/workqueue.c:3237
#2: ffff88802896d198 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:914 [inline]
#2: ffff88802896d198 (&dev->mutex){....}-{4:4}, at: hub_event+0x187/0x4ef0 drivers/usb/core/hub.c:5899
#3: ffff88807f14d198 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:914 [inline]
#3: ffff88807f14d198 (&dev->mutex){....}-{4:4}, at: __device_attach+0x88/0x430 drivers/base/dd.c:1006
#4: ffff88806b989160 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:914 [inline]
#4: ffff88806b989160 (&dev->mutex){....}-{4:4}, at: __device_attach+0x88/0x430 drivers/base/dd.c:1006
#5: ffffffff8ef587e8 (wwan_register_lock){+.+.}-{4:4}, at: wwan_create_dev+0x1c/0x1f0 drivers/net/wwan/wwan_core.c:223
#6: ffffffff8ecda808 (gdp_mutex){+.+.}-{4:4}, at: get_device_parent+0x16f/0x3a0 drivers/base/core.c:3322
stack backtrace:
CPU: 1 UID: 0 PID: 5950 Comm: kworker/1:6 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Workqueue: usb_hub_wq hub_event
Call Trace:
<TASK>
dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
print_circular_bug+0x2ee/0x310 kernel/locking/lockdep.c:2043
check_noncircular+0x134/0x160 kernel/locking/lockdep.c:2175
check_prev_add kernel/locking/lockdep.c:3165 [inline]
check_prevs_add kernel/locking/lockdep.c:3284 [inline]
validate_chain+0xb9b/0x2130 kernel/locking/lockdep.c:3908
__lock_acquire+0xab9/0xd20 kernel/locking/lockdep.c:5237
lock_acquire+0x117/0x350 kernel/locking/lockdep.c:5868
__fs_reclaim_acquire mm/page_alloc.c:4301 [inline]
fs_reclaim_acquire+0x72/0x100 mm/page_alloc.c:4315
might_alloc include/linux/sched/mm.h:317 [inline]
slab_pre_alloc_hook mm/slub.c:4899 [inline]
slab_alloc_node mm/slub.c:5234 [inline]
__kmalloc_cache_noprof+0x40/0x700 mm/slub.c:5766
kmalloc_noprof include/linux/slab.h:957 [inline]
kzalloc_noprof include/linux/slab.h:1094 [inline]
class_dir_create_and_add drivers/base/core.c:3279 [inline]
get_device_parent+0x255/0x3a0 drivers/base/core.c:3339
device_add+0x2e1/0xb80 drivers/base/core.c:3669
wwan_create_dev+0x15a/0x1f0 drivers/net/wwan/wwan_core.c:249
wwan_create_port+0xe0/0xa20 drivers/net/wwan/wwan_core.c:462
wdm_wwan_init+0x80/0x180 drivers/usb/class/cdc-wdm.c:938
wdm_create+0x12be/0x1720 drivers/usb/class/cdc-wdm.c:1125
usb_cdc_wdm_register+0x33/0x60 drivers/usb/class/cdc-wdm.c:1205
cdc_mbim_bind+0x3e1/0x640 drivers/net/usb/cdc_mbim.c:169
usbnet_probe+0xab5/0x28f0 drivers/net/usb/usbnet.c:1802
usb_probe_interface+0x668/0xc90 drivers/usb/core/driver.c:396
call_driver_probe drivers/base/dd.c:-1 [inline]
really_probe+0x26d/0xad0 drivers/base/dd.c:659
__driver_probe_device+0x18c/0x320 drivers/base/dd.c:801
driver_probe_device+0x4f/0x240 drivers/base/dd.c:831
__device_attach_driver+0x279/0x430 drivers/base/dd.c:959
bus_for_each_drv+0x251/0x2e0 drivers/base/bus.c:500
__device_attach+0x2b8/0x430 drivers/base/dd.c:1031
bus_probe_device+0x185/0x260 drivers/base/bus.c:575
device_add+0x7b6/0xb80 drivers/base/core.c:3745
usb_set_configuration+0x1a87/0x2110 drivers/usb/core/message.c:2210
usb_generic_driver_probe+0x8d/0x150 drivers/usb/core/generic.c:250
usb_probe_device+0x1c4/0x3c0 drivers/usb/core/driver.c:291
call_driver_probe drivers/base/dd.c:-1 [inline]
really_probe+0x26d/0xad0 drivers/base/dd.c:659
__driver_probe_device+0x18c/0x320 drivers/base/dd.c:801
driver_probe_device+0x4f/0x240 drivers/base/dd.c:831
__device_attach_driver+0x279/0x430 drivers/base/dd.c:959
bus_for_each_drv+0x251/0x2e0 drivers/base/bus.c:500
__device_attach+0x2b8/0x430 drivers/base/dd.c:1031
bus_probe_device+0x185/0x260 drivers/base/bus.c:575
device_add+0x7b6/0xb80 drivers/base/core.c:3745
usb_new_device+0xa39/0x1720 drivers/usb/core/hub.c:2695
hub_port_connect drivers/usb/core/hub.c:5567 [inline]
hub_port_connect_change drivers/usb/core/hub.c:5707 [inline]
port_event drivers/usb/core/hub.c:5871 [inline]
hub_event+0x29b1/0x4ef0 drivers/usb/core/hub.c:5953
process_one_work+0x93a/0x15e0 kernel/workqueue.c:3261
process_scheduled_works kernel/workqueue.c:3344 [inline]
worker_thread+0x9b0/0xee0 kernel/workqueue.c:3425
kthread+0x711/0x8a0 kernel/kthread.c:463
ret_from_fork+0x599/0xb30 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
</TASK>
wwan wwan0: port wwan0mbim0 attached
cdc_mbim 1-1:1.0 wwan0: register 'cdc_mbim' at usb-dummy_hcd.0-1, CDC MBIM, b6:b8:b8:38:29:fc
usb 1-1: USB disconnect, device number 89
cdc_mbim 1-1:1.0 wwan0: unregister 'cdc_mbim' usb-dummy_hcd.0-1, CDC MBIM
wwan wwan0: port wwan0mbim0 disconnected
usb 1-1: new full-speed USB device number 90 using dummy_hcd
usb 1-1: New USB device found, idVendor=0ccd, idProduct=00b3, bcdDevice=2d.ea
usb 1-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
usb 1-1: Product: syz
usb 1-1: Manufacturer: syz
usb 1-1: SerialNumber: syz
usb 1-1: config 0 descriptor??
usb 1-1: dvb_usb_v2: found a 'TerraTec NOXON DAB Stick' in warm state
dvb_usb_rtl28xxu 1-1:0.0: probe with driver dvb_usb_rtl28xxu failed with error -71
usb 1-1: USB disconnect, device number 90
---
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