=====================================================
BUG: KMSAN: uninit-value in skb_trim+0x1f8/0x280 net/core/skbuff.c:2095
 skb_trim+0x1f8/0x280 net/core/skbuff.c:2095
 ath9k_htc_rx_msg+0x63c/0xbc0 drivers/net/wireless/ath/ath9k/htc_hst.c:460
 ath9k_hif_usb_rx_stream drivers/net/wireless/ath/ath9k/hif_usb.c:654 [inline]
 ath9k_hif_usb_rx_cb+0x1721/0x1df0 drivers/net/wireless/ath/ath9k/hif_usb.c:687
 __usb_hcd_giveback_urb+0x6c6/0x930 drivers/usb/core/hcd.c:1670
 usb_hcd_giveback_urb+0x1e2/0x7c0 drivers/usb/core/hcd.c:1747
 dummy_timer+0x157a/0x51c0 drivers/usb/gadget/udc/dummy_hcd.c:1988
 call_timer_fn+0x81/0x540 kernel/time/timer.c:1421
 expire_timers+0x2f5/0x6d0 kernel/time/timer.c:1466
 __run_timers+0x682/0xa80 kernel/time/timer.c:1737
 run_timer_softirq+0x71/0xe0 kernel/time/timer.c:1750
 __do_softirq+0x1ee/0x7c5 kernel/softirq.c:558
 invoke_softirq+0xa4/0x130 kernel/softirq.c:432
 __irq_exit_rcu kernel/softirq.c:637 [inline]
 irq_exit_rcu+0x76/0x130 kernel/softirq.c:649
 sysvec_apic_timer_interrupt+0xa2/0xc0 arch/x86/kernel/apic/apic.c:1097
 asm_sysvec_apic_timer_interrupt+0x12/0x20
 kmsan_get_metadata+0x6/0x220 mm/kmsan/shadow.c:163
 kmsan_get_shadow_origin_ptr+0x9b/0xf0 mm/kmsan/shadow.c:140
 get_shadow_origin_ptr mm/kmsan/instrumentation.c:35 [inline]
 __msan_metadata_ptr_for_store_4+0x23/0x40 mm/kmsan/instrumentation.c:76
 stack_trace_consume_entry+0x103/0x300 kernel/stacktrace.c:90
 arch_stack_walk+0x2f9/0x3c0 arch/x86/kernel/stacktrace.c:27
 stack_trace_save+0x117/0x1a0 kernel/stacktrace.c:122
 kmsan_save_stack_with_flags mm/kmsan/core.c:80 [inline]
 kmsan_internal_chain_origin+0xac/0x120 mm/kmsan/core.c:252
 kmsan_internal_memmove_metadata+0x201/0x350 mm/kmsan/core.c:163
 __msan_memcpy+0x65/0x90 mm/kmsan/instrumentation.c:145
 sock_write_iter+0x109/0x690 net/socket.c:1048
 call_write_iter include/linux/fs.h:2050 [inline]
 new_sync_write fs/read_write.c:504 [inline]
 vfs_write+0x119f/0x1e80 fs/read_write.c:591
 ksys_write+0x28b/0x510 fs/read_write.c:644
 __do_sys_write fs/read_write.c:656 [inline]
 __se_sys_write fs/read_write.c:653 [inline]
 __x64_sys_write+0xdb/0x120 fs/read_write.c:653
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x51/0xa0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Uninit was created at:
 slab_post_alloc_hook mm/slab.h:754 [inline]
 slab_alloc_node mm/slub.c:3231 [inline]
 __kmalloc_node_track_caller+0xde3/0x14f0 mm/slub.c:4962
 kmalloc_reserve net/core/skbuff.c:354 [inline]
 __alloc_skb+0x545/0xf90 net/core/skbuff.c:426
 __netdev_alloc_skb+0x4b9/0x8c0 net/core/skbuff.c:494
 __dev_alloc_skb include/linux/skbuff.h:3107 [inline]
 ath9k_hif_usb_rx_stream drivers/net/wireless/ath/ath9k/hif_usb.c:636 [inline]
 ath9k_hif_usb_rx_cb+0xead/0x1df0 drivers/net/wireless/ath/ath9k/hif_usb.c:687
 __usb_hcd_giveback_urb+0x6c6/0x930 drivers/usb/core/hcd.c:1670
 usb_hcd_giveback_urb+0x1e2/0x7c0 drivers/usb/core/hcd.c:1747
 dummy_timer+0x157a/0x51c0 drivers/usb/gadget/udc/dummy_hcd.c:1988
 call_timer_fn+0x81/0x540 kernel/time/timer.c:1421
 expire_timers+0x2f5/0x6d0 kernel/time/timer.c:1466
 __run_timers+0x682/0xa80 kernel/time/timer.c:1737
 run_timer_softirq+0x71/0xe0 kernel/time/timer.c:1750
 __do_softirq+0x1ee/0x7c5 kernel/softirq.c:558

CPU: 1 PID: 9924 Comm: udevd Not tainted 5.18.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
=====================================================