syzbot has found a reproducer for the following issue on: HEAD commit: 29ad81a1 arch/x86: add missing include to sparsemem.h git tree: https://github.com/google/kmsan.git master console output: https://syzkaller.appspot.com/x/log.txt?x=16b7e7b2d00000 kernel config: https://syzkaller.appspot.com/x/.config?x=9c7da2160236454 dashboard link: https://syzkaller.appspot.com/bug?extid=e4534e8c1c382508312c compiler: Debian clang version 11.0.1-2 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=12897ef6d00000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=143ee4aad00000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+e4534e8c1c382508312c@xxxxxxxxxxxxxxxxxxxxxxxxx ===================================================== BUG: KMSAN: uninit-value in skb_trim+0x1fa/0x280 net/core/skbuff.c:1927 CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.11.0-rc7-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:79 [inline] dump_stack+0x21c/0x280 lib/dump_stack.c:120 kmsan_report+0xfb/0x1e0 mm/kmsan/kmsan_report.c:118 __msan_warning+0x5f/0xa0 mm/kmsan/kmsan_instr.c:197 skb_trim+0x1fa/0x280 net/core/skbuff.c:1927 ath9k_htc_rx_msg+0x631/0x1f30 drivers/net/wireless/ath/ath9k/htc_hst.c:455 ath9k_hif_usb_rx_stream drivers/net/wireless/ath/ath9k/hif_usb.c:647 [inline] ath9k_hif_usb_rx_cb+0x184e/0x1d20 drivers/net/wireless/ath/ath9k/hif_usb.c:680 __usb_hcd_giveback_urb+0x6ff/0x930 drivers/usb/core/hcd.c:1656 usb_hcd_giveback_urb+0x1cb/0x730 drivers/usb/core/hcd.c:1726 dummy_timer+0xda7/0x74f0 drivers/usb/gadget/udc/dummy_hcd.c:1971 call_timer_fn+0x7d/0x450 kernel/time/timer.c:1417 expire_timers+0x328/0x6c0 kernel/time/timer.c:1462 __run_timers+0x624/0x9e0 kernel/time/timer.c:1731 run_timer_softirq+0x2d/0x50 kernel/time/timer.c:1744 __do_softirq+0x1b9/0x715 kernel/softirq.c:343 asm_call_irq_on_stack+0xf/0x20 </IRQ> __run_on_irqstack arch/x86/include/asm/irq_stack.h:26 [inline] run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:77 [inline] do_softirq_own_stack+0x6e/0x90 arch/x86/kernel/irq_64.c:77 invoke_softirq kernel/softirq.c:226 [inline] __irq_exit_rcu+0x22f/0x280 kernel/softirq.c:420 irq_exit_rcu+0xe/0x10 kernel/softirq.c:432 sysvec_apic_timer_interrupt+0x106/0x130 arch/x86/kernel/apic/apic.c:1100 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:647 RIP: 0010:native_irq_disable arch/x86/include/asm/irqflags.h:49 [inline] RIP: 0010:arch_local_irq_disable arch/x86/include/asm/irqflags.h:89 [inline] RIP: 0010:acpi_safe_halt drivers/acpi/processor_idle.c:111 [inline] RIP: 0010:acpi_idle_do_entry drivers/acpi/processor_idle.c:516 [inline] RIP: 0010:acpi_idle_enter+0x61d/0x760 drivers/acpi/processor_idle.c:647 Code: f7 d3 44 21 e3 48 85 db 0f 84 ec 00 00 00 4d 85 e4 0f 85 f4 00 00 00 e9 0c 00 00 00 e8 1c b5 3a fb 0f 00 2d 5f e7 5d 09 fb f4 <fa> e9 e0 00 00 00 84 c0 8b 7d b8 0f 45 7d 98 e8 8f 3b bc fb e9 e5 RSP: 0018:ffffffff91403b70 EFLAGS: 00000246 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 000000023eaec040 RDX: ffffffff91431040 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffffff91403c08 R08: ffffffff86809bde R09: ffff88813fffa000 R10: 0000000000000002 R11: ffffffff91431040 R12: 0000000000000000 R13: ffff888102fa0064 R14: 0000000000000000 R15: ffffffff91431ab8 cpuidle_enter_state+0x99e/0x1750 drivers/cpuidle/cpuidle.c:237 cpuidle_enter+0xe3/0x170 drivers/cpuidle/cpuidle.c:351 call_cpuidle kernel/sched/idle.c:158 [inline] cpuidle_idle_call kernel/sched/idle.c:239 [inline] do_idle+0x5df/0x790 kernel/sched/idle.c:299 cpu_startup_entry+0x45/0x50 kernel/sched/idle.c:396 rest_init+0x1c8/0x1f0 init/main.c:721 arch_call_rest_init+0x13/0x15 start_kernel+0xa17/0xbd8 init/main.c:1064 x86_64_start_reservations+0x2a/0x2c arch/x86/kernel/head64.c:525 x86_64_start_kernel+0x86/0x89 arch/x86/kernel/head64.c:506 secondary_startup_64_no_verify+0xb0/0xbb Uninit was created at: kmsan_save_stack_with_flags mm/kmsan/kmsan.c:121 [inline] kmsan_internal_poison_shadow+0x5c/0xf0 mm/kmsan/kmsan.c:104 kmsan_slab_alloc+0x8d/0xe0 mm/kmsan/kmsan_hooks.c:76 slab_alloc_node mm/slub.c:2907 [inline] __kmalloc_node_track_caller+0xa37/0x1430 mm/slub.c:4527 __kmalloc_reserve net/core/skbuff.c:142 [inline] __alloc_skb+0x2f8/0xb30 net/core/skbuff.c:210 __netdev_alloc_skb+0x450/0x7f0 net/core/skbuff.c:446 __dev_alloc_skb include/linux/skbuff.h:2839 [inline] ath9k_hif_usb_rx_stream drivers/net/wireless/ath/ath9k/hif_usb.c:629 [inline] ath9k_hif_usb_rx_cb+0xe58/0x1d20 drivers/net/wireless/ath/ath9k/hif_usb.c:680 __usb_hcd_giveback_urb+0x6ff/0x930 drivers/usb/core/hcd.c:1656 usb_hcd_giveback_urb+0x1cb/0x730 drivers/usb/core/hcd.c:1726 dummy_timer+0xda7/0x74f0 drivers/usb/gadget/udc/dummy_hcd.c:1971 call_timer_fn+0x7d/0x450 kernel/time/timer.c:1417 expire_timers+0x328/0x6c0 kernel/time/timer.c:1462 __run_timers+0x624/0x9e0 kernel/time/timer.c:1731 run_timer_softirq+0x2d/0x50 kernel/time/timer.c:1744 __do_softirq+0x1b9/0x715 kernel/softirq.c:343 ===================================================== ===================================================== BUG: KMSAN: uninit-value in skb_trim+0x1fa/0x280 net/core/skbuff.c:1927 CPU: 0 PID: 0 Comm: swapper/0 Tainted: G B 5.11.0-rc7-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:79 [inline] dump_stack+0x21c/0x280 lib/dump_stack.c:120 kmsan_report+0xfb/0x1e0 mm/kmsan/kmsan_report.c:118 __msan_warning+0x5f/0xa0 mm/kmsan/kmsan_instr.c:197 skb_trim+0x1fa/0x280 net/core/skbuff.c:1927 ath9k_htc_rx_msg+0x631/0x1f30 drivers/net/wireless/ath/ath9k/htc_hst.c:455 ath9k_hif_usb_rx_stream drivers/net/wireless/ath/ath9k/hif_usb.c:647 [inline] ath9k_hif_usb_rx_cb+0x184e/0x1d20 drivers/net/wireless/ath/ath9k/hif_usb.c:680 __usb_hcd_giveback_urb+0x6ff/0x930 drivers/usb/core/hcd.c:1656 usb_hcd_giveback_urb+0x1cb/0x730 drivers/usb/core/hcd.c:1726 dummy_timer+0xda7/0x74f0 drivers/usb/gadget/udc/dummy_hcd.c:1971 call_timer_fn+0x7d/0x450 kernel/time/timer.c:1417 expire_timers+0x328/0x6c0 kernel/time/timer.c:1462 __run_timers+0x624/0x9e0 kernel/time/timer.c:1731 run_timer_softirq+0x2d/0x50 kernel/time/timer.c:1744 __do_softirq+0x1b9/0x715 kernel/softirq.c:343 asm_call_irq_on_stack+0xf/0x20 </IRQ> __run_on_irqstack arch/x86/include/asm/irq_stack.h:26 [inline] run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:77 [inline] do_softirq_own_stack+0x6e/0x90 arch/x86/kernel/irq_64.c:77 invoke_softirq kernel/softirq.c:226 [inline] __irq_exit_rcu+0x22f/0x280 kernel/softirq.c:420 irq_exit_rcu+0xe/0x10 kernel/softirq.c:432 sysvec_apic_timer_interrupt+0x106/0x130 arch/x86/kernel/apic/apic.c:1100 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:647 RIP: 0010:native_irq_disable arch/x86/include/asm/irqflags.h:49 [inline] RIP: 0010:arch_local_irq_disable arch/x86/include/asm/irqflags.h:89 [inline] RIP: 0010:acpi_safe_halt drivers/acpi/processor_idle.c:111 [inline] RIP: 0010:acpi_idle_do_entry drivers/acpi/processor_idle.c:516 [inline] RIP: 0010:acpi_idle_enter+0x61d/0x760 drivers/acpi/processor_idle.c:647 Code: f7 d3 44 21 e3 48 85 db 0f 84 ec 00 00 00 4d 85 e4 0f 85 f4 00 00 00 e9 0c 00 00 00 e8 1c b5 3a fb 0f 00 2d 5f e7 5d 09 fb f4 <fa> e9 e0 00 00 00 84 c0 8b 7d b8 0f 45 7d 98 e8 8f 3b bc fb e9 e5 RSP: 0018:ffffffff91403b70 EFLAGS: 00000246 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 000000023eaec040 RDX: ffffffff91431040 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffffff91403c08 R08: ffffffff86809bde R09: ffff88813fffa000 R10: 0000000000000002 R11: ffffffff91431040 R12: 0000000000000000 R13: ffff888102fa0064 R14: 0000000000000000 R15: ffffffff91431ab8 cpuidle_enter_state+0x99e/0x1750 drivers/cpuidle/cpuidle.c:237 cpuidle_enter+0xe3/0x170 drivers/cpuidle/cpuidle.c:351 call_cpuidle kernel/sched/idle.c:158 [inline] cpuidle_idle_call kernel/sched/idle.c:239 [inline] do_idle+0x5df/0x790 kernel/sched/idle.c:299 cpu_startup_entry+0x45/0x50 kernel/sched/idle.c:396 rest_init+0x1c8/0x1f0 init/main.c:721 arch_call_rest_init+0x13/0x15 start_kernel+0xa17/0xbd8 init/main.c:1064 x86_64_start_reservations+0x2a/0x2c arch/x86/kernel/head64.c:525 x86_64_start_kernel+0x86/0x89 arch/x86/kernel/head64.c:506 secondary_startup_64_no_verify+0xb0/0xbb Uninit was created at: kmsan_save_stack_with_flags mm/kmsan/kmsan.c:121 [inline] kmsan_internal_poison_shadow+0x5c/0xf0 mm/kmsan/kmsan.c:104 kmsan_slab_alloc+0x8d/0xe0 mm/kmsan/kmsan_hooks.c:76 slab_alloc_node mm/slub.c:2907 [inline] __kmalloc_node_track_caller+0xa37/0x1430 mm/slub.c:4527 __kmalloc_reserve net/core/skbuff.c:142 [inline] __alloc_skb+0x2f8/0xb30 net/core/skbuff.c:210 __netdev_alloc_skb+0x450/0x7f0 net/core/skbuff.c:446 __dev_alloc_skb include/linux/skbuff.h:2839 [inline] ath9k_hif_usb_rx_stream drivers/net/wireless/ath/ath9k/hif_usb.c:629 [inline] ath9k_hif_usb_rx_cb+0xe58/0x1d20 drivers/net/wireless/ath/ath9k/hif_usb.c:680 __usb_hcd_giveback_urb+0x6ff/0x930 drivers/usb/core/hcd.c:1656 usb_hcd_giveback_urb+0x1cb/0x730 drivers/usb/core/hcd.c:1726 dummy_timer+0xda7/0x74f0 drivers/usb/gadget/udc/dummy_hcd.c:1971 call_timer_fn+0x7d/0x450 kernel/time/timer.c:1417 expire_timers+0x328/0x6c0 kernel/time/timer.c:1462 __run_timers+0x624/0x9e0 kernel/time/timer.c:1731 run_timer_softirq+0x2d/0x50 kernel/time/timer.c:1744 __do_softirq+0x1b9/0x715 kernel/softirq.c:343 =====================================================
