KMSAN: uninit-value in skb

KMSAN: uninit-value in skb_trim
Status: upstream: reported C repro on 2020/08/24 13:58
Reported-by: syzbot+e4534e8c1c382508312c@syzkaller.appspotmail.com
First crash: 244d, last: 1d14h

Patch testing requests:
Created	Duration	User	Patch	Repo	Result
2021/04/19 22:25	28m	phil@philpotter.co.uk		https://github.com/google/kmsan.git master	report log

Sample crash report:

=====================================================
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
=====================================================

Crashes (199):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	VM info	Title
ci-upstream-kmsan-gce	2021/03/21 09:13	https://github.com/google/kmsan.git master	29ad81a1	17810eae	.config	log	report	syz	C		KMSAN: uninit-value in skb_trim
ci-upstream-kmsan-gce	2021/04/19 07:03	https://github.com/google/kmsan.git master	4ebaab5f	7e2b734b	.config	log	report			info	KMSAN: uninit-value in skb_trim
ci-upstream-kmsan-gce	2021/04/17 16:16	https://github.com/google/kmsan.git master	4ebaab5f	7e2b734b	.config	log	report			info	KMSAN: uninit-value in skb_trim
ci-upstream-kmsan-gce	2021/04/14 04:25	https://github.com/google/kmsan.git master	4ebaab5f	a184b83e	.config	log	report			info	KMSAN: uninit-value in skb_trim
ci-upstream-kmsan-gce	2021/04/13 13:34	https://github.com/google/kmsan.git master	4ebaab5f	bfeda1b1	.config	log	report			info	KMSAN: uninit-value in skb_trim
ci-upstream-kmsan-gce	2021/04/13 09:47	https://github.com/google/kmsan.git master	4ebaab5f	bfeda1b1	.config	log	report			info	KMSAN: uninit-value in skb_trim
ci-upstream-kmsan-gce	2021/04/13 01:11	https://github.com/google/kmsan.git master	4ebaab5f	bfeda1b1	.config	log	report			info	KMSAN: uninit-value in skb_trim
ci-upstream-kmsan-gce	2021/04/11 19:05	https://github.com/google/kmsan.git master	4ebaab5f	bfeda1b1	.config	log	report			info	KMSAN: uninit-value in skb_trim
ci-upstream-kmsan-gce	2021/04/10 11:34	https://github.com/google/kmsan.git master	4ebaab5f	bfeda1b1	.config	log	report			info	KMSAN: uninit-value in skb_trim
ci-upstream-kmsan-gce	2021/04/09 17:29	https://github.com/google/kmsan.git master	29ad81a1	6a81331a	.config	log	report			info	KMSAN: uninit-value in skb_trim
ci-upstream-kmsan-gce	2021/04/08 19:04	https://github.com/google/kmsan.git master	29ad81a1	6a81331a	.config	log	report			info	KMSAN: uninit-value in skb_trim
ci-upstream-kmsan-gce	2021/04/05 17:12	https://github.com/google/kmsan.git master	29ad81a1	6a81331a	.config	log	report			info	KMSAN: uninit-value in skb_trim
ci-upstream-kmsan-gce	2021/03/30 21:53	https://github.com/google/kmsan.git master	29ad81a1	6a81331a	.config	log	report			info	KMSAN: uninit-value in skb_trim
ci-upstream-kmsan-gce	2021/03/29 23:33	https://github.com/google/kmsan.git master	29ad81a1	6a81331a	.config	log	report			info	KMSAN: uninit-value in skb_trim
ci-upstream-kmsan-gce	2021/03/29 17:07	https://github.com/google/kmsan.git master	29ad81a1	a8529b82	.config	log	report			info	KMSAN: uninit-value in skb_trim
ci-upstream-kmsan-gce	2021/03/28 22:23	https://github.com/google/kmsan.git master	29ad81a1	a8529b82	.config	log	report			info	KMSAN: uninit-value in skb_trim
ci-upstream-kmsan-gce	2021/03/28 06:02	https://github.com/google/kmsan.git master	29ad81a1	a8529b82	.config	log	report			info	KMSAN: uninit-value in skb_trim
ci-upstream-kmsan-gce	2021/03/27 15:06	https://github.com/google/kmsan.git master	29ad81a1	a8529b82	.config	log	report			info	KMSAN: uninit-value in skb_trim
ci-upstream-kmsan-gce	2021/03/26 01:06	https://github.com/google/kmsan.git master	29ad81a1	6a383ecf	.config	log	report			info	KMSAN: uninit-value in skb_trim
ci-upstream-kmsan-gce	2021/03/25 17:21	https://github.com/google/kmsan.git master	29ad81a1	6a383ecf	.config	log	report			info	KMSAN: uninit-value in skb_trim
ci-upstream-kmsan-gce	2021/03/25 12:26	https://github.com/google/kmsan.git master	29ad81a1	607e3baf	.config	log	report			info	KMSAN: uninit-value in skb_trim
ci-upstream-kmsan-gce	2021/03/24 12:22	https://github.com/google/kmsan.git master	29ad81a1	e613994b	.config	log	report			info	KMSAN: uninit-value in skb_trim
ci-upstream-kmsan-gce	2021/03/24 09:50	https://github.com/google/kmsan.git master	29ad81a1	e613994b	.config	log	report			info	KMSAN: uninit-value in skb_trim
ci-upstream-kmsan-gce	2021/03/21 07:42	https://github.com/google/kmsan.git master	29ad81a1	17810eae	.config	log	report			info	KMSAN: uninit-value in skb_trim
ci-upstream-kmsan-gce	2021/03/09 15:27	https://github.com/google/kmsan.git master	29ad81a1	09fbf400	.config	log	report			info	KMSAN: uninit-value in skb_trim
ci-upstream-kmsan-gce	2021/03/08 17:27	https://github.com/google/kmsan.git master	29ad81a1	09fbf400	.config	log	report			info	KMSAN: uninit-value in skb_trim
ci-upstream-kmsan-gce	2021/03/05 09:58	https://github.com/google/kmsan.git master	29ad81a1	9d751681	.config	log	report			info	KMSAN: uninit-value in skb_trim
ci-upstream-kmsan-gce	2021/03/05 03:43	https://github.com/google/kmsan.git master	29ad81a1	9d751681	.config	log	report			info	KMSAN: uninit-value in skb_trim
ci-upstream-kmsan-gce	2021/03/01 03:42	https://github.com/google/kmsan.git master	29ad81a1	4c37c133	.config	log	report			info	KMSAN: uninit-value in skb_trim
ci-upstream-kmsan-gce	2021/02/28 06:40	https://github.com/google/kmsan.git master	29ad81a1	4c37c133	.config	log	report			info	KMSAN: uninit-value in skb_trim
ci-upstream-kmsan-gce	2021/02/26 06:11	https://github.com/google/kmsan.git master	29ad81a1	76f7fc95	.config	log	report			info	KMSAN: uninit-value in skb_trim
ci-upstream-kmsan-gce-386	2021/04/20 09:51	https://github.com/google/kmsan.git master	4ebaab5f	4285c989	.config	log	report			info	KMSAN: uninit-value in skb_trim
ci-upstream-kmsan-gce-386	2021/04/19 19:51	https://github.com/google/kmsan.git master	4ebaab5f	50f523d7	.config	log	report			info	KMSAN: uninit-value in skb_trim
ci-upstream-kmsan-gce-386	2021/04/13 15:01	https://github.com/google/kmsan.git master	4ebaab5f	bfeda1b1	.config	log	report			info	KMSAN: uninit-value in skb_trim
ci-upstream-kmsan-gce-386	2021/04/08 12:58	https://github.com/google/kmsan.git master	29ad81a1	6a81331a	.config	log	report			info	KMSAN: uninit-value in skb_trim
ci-upstream-kmsan-gce-386	2021/04/07 15:44	https://github.com/google/kmsan.git master	29ad81a1	6a81331a	.config	log	report			info	KMSAN: uninit-value in skb_trim
ci-upstream-kmsan-gce-386	2021/04/07 08:30	https://github.com/google/kmsan.git master	29ad81a1	6a81331a	.config	log	report			info	KMSAN: uninit-value in skb_trim
ci-upstream-kmsan-gce-386	2021/04/06 16:51	https://github.com/google/kmsan.git master	29ad81a1	6a81331a	.config	log	report			info	KMSAN: uninit-value in skb_trim
ci-upstream-kmsan-gce-386	2021/04/06 05:02	https://github.com/google/kmsan.git master	29ad81a1	6a81331a	.config	log	report			info	KMSAN: uninit-value in skb_trim
ci-upstream-kmsan-gce-386	2021/04/02 16:00	https://github.com/google/kmsan.git master	29ad81a1	6a81331a	.config	log	report			info	KMSAN: uninit-value in skb_trim
ci-upstream-kmsan-gce-386	2021/03/27 14:02	https://github.com/google/kmsan.git master	29ad81a1	a8529b82	.config	log	report			info	KMSAN: uninit-value in skb_trim
ci-upstream-kmsan-gce-386	2021/03/21 07:35	https://github.com/google/kmsan.git master	29ad81a1	17810eae	.config	log	report			info	KMSAN: uninit-value in skb_trim
ci-upstream-kmsan-gce-386	2021/03/19 10:52	https://github.com/google/kmsan.git master	29ad81a1	380dcc3e	.config	log	report			info	KMSAN: uninit-value in skb_trim
ci-upstream-kmsan-gce-386	2021/03/18 19:40	https://github.com/google/kmsan.git master	29ad81a1	7216542e	.config	log	report			info	KMSAN: uninit-value in skb_trim
ci-upstream-kmsan-gce-386	2021/03/04 13:46	https://github.com/google/kmsan.git master	29ad81a1	d7e4e604	.config	log	report			info	KMSAN: uninit-value in skb_trim
ci-upstream-kmsan-gce-386	2021/03/03 14:58	https://github.com/google/kmsan.git master	29ad81a1	e5b64d68	.config	log	report			info	KMSAN: uninit-value in skb_trim
ci-upstream-kmsan-gce-386	2021/03/02 09:47	https://github.com/google/kmsan.git master	29ad81a1	183afb6c	.config	log	report			info	KMSAN: uninit-value in skb_trim
ci-upstream-kmsan-gce	2021/01/10 09:25	https://github.com/google/kmsan.git master	73d62e81	2c1f2513	.config	log	report			info
ci-upstream-kmsan-gce	2020/08/23 17:11	https://github.com/google/kmsan.git master	ce8056d1	cef5ae68	.config	log	report
ci-upstream-kmsan-gce	2020/08/20 13:38	https://github.com/google/kmsan.git master	ce8056d1	ed282a3a	.config	log	report