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BUG: KMSAN: uninit-value in skb_trim+0x1f2/0x280 net/core/skbuff.c:1916
CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.8.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x21c/0x280 lib/dump_stack.c:118
 kmsan_report+0xf7/0x1e0 mm/kmsan/kmsan_report.c:121
 __msan_warning+0x58/0xa0 mm/kmsan/kmsan_instr.c:215
 skb_trim+0x1f2/0x280 net/core/skbuff.c:1916
 ath9k_htc_rx_msg+0x5f6/0x1f50 drivers/net/wireless/ath/ath9k/htc_hst.c:453
 ath9k_hif_usb_rx_stream drivers/net/wireless/ath/ath9k/hif_usb.c:638 [inline]
 ath9k_hif_usb_rx_cb+0x1841/0x1d10 drivers/net/wireless/ath/ath9k/hif_usb.c:671
 __usb_hcd_giveback_urb+0x687/0x870 drivers/usb/core/hcd.c:1650
 usb_hcd_giveback_urb+0x1cb/0x730 drivers/usb/core/hcd.c:1716
 dummy_timer+0xd98/0x71c0 drivers/usb/gadget/udc/dummy_hcd.c:1967
 call_timer_fn+0x226/0x550 kernel/time/timer.c:1404
 expire_timers+0x4fc/0x780 kernel/time/timer.c:1449
 __run_timers+0xaf4/0xd30 kernel/time/timer.c:1773
 run_timer_softirq+0x2d/0x50 kernel/time/timer.c:1786
 __do_softirq+0x2ea/0x7f5 kernel/softirq.c:293
 asm_call_on_stack+0xf/0x20 arch/x86/entry/entry_64.S:711
 </IRQ>
 __run_on_irqstack arch/x86/include/asm/irq_stack.h:23 [inline]
 run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:50 [inline]
 do_softirq_own_stack+0x7c/0xa0 arch/x86/kernel/irq_64.c:77
 invoke_softirq kernel/softirq.c:390 [inline]
 __irq_exit_rcu+0x226/0x270 kernel/softirq.c:420
 irq_exit_rcu+0xe/0x10 kernel/softirq.c:432
 sysvec_apic_timer_interrupt+0x107/0x130 arch/x86/kernel/apic/apic.c:1091
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:593
RIP: 0010:finish_lock_switch+0x2b/0x40 kernel/sched/core.c:3198
Code: 48 89 e5 53 48 89 fb e8 23 c4 b9 00 8b b8 88 0c 00 00 48 8b 00 48 85 c0 75 12 48 89 df e8 ad bd b9 00 c6 00 00 c6 03 00 fb 5b <5d> c3 e8 5e c3 b9 00 eb e7 66 90 66 2e 0f 1f 84 00 00 00 00 00 55
RSP: 0018:ffff88812df7fd68 EFLAGS: 00000282
RAX: ffff88821fdb2340 RBX: ffff88812d278000 RCX: 000000021fd13340
RDX: ffff88821fd13340 RSI: 00000000000004a0 RDI: ffff88812fd94340
RBP: ffff88812df7fd68 R08: ffffea000000000f R09: ffff88812fffa000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff88812df809d8
R13: ffff88812df80000 R14: 0000000000000001 R15: ffff88812fd94340
 finish_task_switch+0xd2/0x2f0 kernel/sched/core.c:3303
 context_switch kernel/sched/core.c:3467 [inline]
 __schedule+0x4ae/0x520 kernel/sched/core.c:4195
 schedule_idle+0x60/0xa0 kernel/sched/core.c:4298
 do_idle+0x7ea/0x810 kernel/sched/idle.c:304
 cpu_startup_entry+0x45/0x50 kernel/sched/idle.c:372
 start_secondary+0x1bf/0x240 arch/x86/kernel/smpboot.c:268
 secondary_startup_64+0xa4/0xb0 arch/x86/kernel/head_64.S:243

Uninit was created at:
 kmsan_save_stack_with_flags+0x3c/0x90 mm/kmsan/kmsan.c:144
 kmsan_internal_alloc_meta_for_pages mm/kmsan/kmsan_shadow.c:269 [inline]
 kmsan_alloc_page+0xc5/0x1a0 mm/kmsan/kmsan_shadow.c:293
 __alloc_pages_nodemask+0xdf0/0x1030 mm/page_alloc.c:4889
 __alloc_pages include/linux/gfp.h:509 [inline]
 __alloc_pages_node include/linux/gfp.h:522 [inline]
 alloc_pages_node include/linux/gfp.h:536 [inline]
 __page_frag_cache_refill mm/page_alloc.c:4964 [inline]
 page_frag_alloc+0x35b/0x880 mm/page_alloc.c:4994
 __netdev_alloc_skb+0x2a8/0xc90 net/core/skbuff.c:451
 __dev_alloc_skb include/linux/skbuff.h:2813 [inline]
 ath9k_hif_usb_rx_stream drivers/net/wireless/ath/ath9k/hif_usb.c:620 [inline]
 ath9k_hif_usb_rx_cb+0xe5a/0x1d10 drivers/net/wireless/ath/ath9k/hif_usb.c:671
 __usb_hcd_giveback_urb+0x687/0x870 drivers/usb/core/hcd.c:1650
 usb_hcd_giveback_urb+0x1cb/0x730 drivers/usb/core/hcd.c:1716
 dummy_timer+0xd98/0x71c0 drivers/usb/gadget/udc/dummy_hcd.c:1967
 call_timer_fn+0x226/0x550 kernel/time/timer.c:1404
 expire_timers+0x4fc/0x780 kernel/time/timer.c:1449
 __run_timers+0xaf4/0xd30 kernel/time/timer.c:1773
 run_timer_softirq+0x2d/0x50 kernel/time/timer.c:1786
 __do_softirq+0x2ea/0x7f5 kernel/softirq.c:293
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