KMSAN: uninit-value in batadv_get

KMSAN: uninit-value in batadv_get_vid
Status: upstream: reported C repro on 2020/02/24 08:38
Reported-by: syzbot+0adb190024de0a0e265b@syzkaller.appspotmail.com
First crash: 698d, last: 13h50m

similar bugs (2):
Kernel	Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	KMSAN: uninit-value in br_dev_xmit	C			518	7d17h	695d	0/22	upstream: reported C repro on 2020/02/24 08:38
upstream	KMSAN: uninit-value in eth_type_trans (2)	C			1475	22m	728d	0/22	upstream: reported C repro on 2020/01/22 16:47

Sample crash report:

=====================================================
BUG: KMSAN: uninit-value in batadv_get_vid+0x1fd/0x340 net/batman-adv/main.c:650
CPU: 0 PID: 12317 Comm: syz-executor026 Not tainted 5.6.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1c9/0x220 lib/dump_stack.c:118
 kmsan_report+0xf7/0x1e0 mm/kmsan/kmsan_report.c:118
 __msan_warning+0x58/0xa0 mm/kmsan/kmsan_instr.c:215
 batadv_get_vid+0x1fd/0x340 net/batman-adv/main.c:650
 batadv_interface_tx+0x30a/0x2450 net/batman-adv/soft-interface.c:212
 __netdev_start_xmit include/linux/netdevice.h:4524 [inline]
 netdev_start_xmit include/linux/netdevice.h:4538 [inline]
 xmit_one net/core/dev.c:3470 [inline]
 dev_hard_start_xmit+0x531/0xab0 net/core/dev.c:3486
 __dev_queue_xmit+0x37de/0x4220 net/core/dev.c:4063
 dev_queue_xmit+0x4b/0x60 net/core/dev.c:4096
 __bpf_tx_skb net/core/filter.c:2061 [inline]
 __bpf_redirect_common net/core/filter.c:2100 [inline]
 __bpf_redirect+0x11d5/0x1440 net/core/filter.c:2107
 ____bpf_clone_redirect net/core/filter.c:2140 [inline]
 bpf_clone_redirect+0x466/0x620 net/core/filter.c:2112
 bpf_prog_bb15b996d00816f9+0x7a4/0x1000
 bpf_dispatcher_nopfunc include/linux/bpf.h:521 [inline]
 bpf_test_run+0x60c/0xe50 net/bpf/test_run.c:48
 bpf_prog_test_run_skb+0xcab/0x24a0 net/bpf/test_run.c:388
 bpf_prog_test_run kernel/bpf/syscall.c:2572 [inline]
 __do_sys_bpf+0xa684/0x13510 kernel/bpf/syscall.c:3414
 __se_sys_bpf kernel/bpf/syscall.c:3355 [inline]
 __ia32_sys_bpf+0xdb/0x120 kernel/bpf/syscall.c:3355
 do_syscall_32_irqs_on arch/x86/entry/common.c:339 [inline]
 do_fast_syscall_32+0x3c7/0x6e0 arch/x86/entry/common.c:410
 entry_SYSENTER_compat+0x68/0x77 arch/x86/entry/entry_64_compat.S:139
RIP: 0023:0xf7fc8d99
Code: 90 e8 0b 00 00 00 f3 90 0f ae e8 eb f9 8d 74 26 00 89 3c 24 c3 90 90 90 90 90 90 90 90 90 90 90 90 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 eb 0d 90 90 90 90 90 90 90 90 90 90 90 90
RSP: 002b:00000000ff9adc0c EFLAGS: 00000246 ORIG_RAX: 0000000000000165
RAX: ffffffffffffffda RBX: 000000000000000a RCX: 0000000020000280
RDX: 0000000000000040 RSI: 0000000000000000 RDI: 000000000000005b
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000

Uninit was created at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:144 [inline]
 kmsan_internal_poison_shadow+0x66/0xd0 mm/kmsan/kmsan.c:127
 kmsan_slab_alloc+0x8a/0xe0 mm/kmsan/kmsan_hooks.c:82
 slab_alloc_node mm/slub.c:2793 [inline]
 __kmalloc_node_track_caller+0xb40/0x1200 mm/slub.c:4401
 __kmalloc_reserve net/core/skbuff.c:142 [inline]
 pskb_expand_head+0x20b/0x1b00 net/core/skbuff.c:1629
 skb_ensure_writable+0x3ea/0x490 net/core/skbuff.c:5453
 __bpf_try_make_writable net/core/filter.c:1635 [inline]
 bpf_try_make_writable net/core/filter.c:1641 [inline]
 bpf_try_make_head_writable net/core/filter.c:1649 [inline]
 ____bpf_clone_redirect net/core/filter.c:2134 [inline]
 bpf_clone_redirect+0x251/0x620 net/core/filter.c:2112
 bpf_prog_bb15b996d00816f9+0x7a4/0x1000
 bpf_dispatcher_nopfunc include/linux/bpf.h:521 [inline]
 bpf_test_run+0x60c/0xe50 net/bpf/test_run.c:48
 bpf_prog_test_run_skb+0xcab/0x24a0 net/bpf/test_run.c:388
 bpf_prog_test_run kernel/bpf/syscall.c:2572 [inline]
 __do_sys_bpf+0xa684/0x13510 kernel/bpf/syscall.c:3414
 __se_sys_bpf kernel/bpf/syscall.c:3355 [inline]
 __ia32_sys_bpf+0xdb/0x120 kernel/bpf/syscall.c:3355
 do_syscall_32_irqs_on arch/x86/entry/common.c:339 [inline]
 do_fast_syscall_32+0x3c7/0x6e0 arch/x86/entry/common.c:410
 entry_SYSENTER_compat+0x68/0x77 arch/x86/entry/entry_64_compat.S:139
=====================================================

Crashes (1817):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	VM info	Title
ci-upstream-kmsan-gce-386	2020/02/22 06:30	https://github.com/google/kmsan.git master	8bbbc5cf3dca	2ffa6679	.config	log	report	syz	C
ci-upstream-kmsan-gce-386	2022/01/19 05:52	https://github.com/google/kmsan.git master	fa3879a274df	731a2d23	.config	log	report			info	KMSAN: uninit-value in batadv_get_vid
ci-upstream-kmsan-gce-386	2022/01/18 01:36	https://github.com/google/kmsan.git master	fa3879a274df	731a2d23	.config	log	report			info	KMSAN: uninit-value in batadv_get_vid
ci-upstream-kmsan-gce-386	2022/01/14 20:53	https://github.com/google/kmsan.git master	fa3879a274df	53e00b45	.config	log	report			info	KMSAN: uninit-value in batadv_get_vid
ci-upstream-kmsan-gce-386	2022/01/13 16:57	https://github.com/google/kmsan.git master	fa3879a274df	44d1319a	.config	log	report			info	KMSAN: uninit-value in batadv_get_vid
ci-upstream-kmsan-gce-386	2022/01/13 15:02	https://github.com/google/kmsan.git master	fa3879a274df	44d1319a	.config	log	report			info	KMSAN: uninit-value in batadv_get_vid
ci-upstream-kmsan-gce-386	2022/01/13 11:12	https://github.com/google/kmsan.git master	fa3879a274df	44d1319a	.config	log	report			info	KMSAN: uninit-value in batadv_get_vid
ci-upstream-kmsan-gce-386	2022/01/12 23:25	https://github.com/google/kmsan.git master	fa3879a274df	44d1319a	.config	log	report			info	KMSAN: uninit-value in batadv_get_vid
ci-upstream-kmsan-gce-386	2022/01/11 16:29	https://github.com/google/kmsan.git master	fa3879a274df	1884f55a	.config	log	report			info	KMSAN: uninit-value in batadv_get_vid
ci-upstream-kmsan-gce-386	2022/01/11 13:21	https://github.com/google/kmsan.git master	fa3879a274df	1884f55a	.config	log	report			info	KMSAN: uninit-value in batadv_get_vid
ci-upstream-kmsan-gce-386	2022/01/10 16:00	https://github.com/google/kmsan.git master	81c325bbf94e	2ca0d385	.config	log	report			info	KMSAN: uninit-value in batadv_get_vid
ci-upstream-kmsan-gce-386	2022/01/10 12:09	https://github.com/google/kmsan.git master	81c325bbf94e	2ca0d385	.config	log	report			info	KMSAN: uninit-value in batadv_get_vid
ci-upstream-kmsan-gce-386	2022/01/10 05:28	https://github.com/google/kmsan.git master	81c325bbf94e	2ca0d385	.config	log	report			info	KMSAN: uninit-value in batadv_get_vid
ci-upstream-kmsan-gce-386	2022/01/09 04:14	https://github.com/google/kmsan.git master	81c325bbf94e	2ca0d385	.config	log	report			info	KMSAN: uninit-value in batadv_get_vid
ci-upstream-kmsan-gce-386	2022/01/09 02:40	https://github.com/google/kmsan.git master	81c325bbf94e	2ca0d385	.config	log	report			info	KMSAN: uninit-value in batadv_get_vid
ci-upstream-kmsan-gce-386	2022/01/08 02:16	https://github.com/google/kmsan.git master	81c325bbf94e	2ca0d385	.config	log	report			info	KMSAN: uninit-value in batadv_get_vid
ci-upstream-kmsan-gce-386	2022/01/08 00:07	https://github.com/google/kmsan.git master	81c325bbf94e	2ca0d385	.config	log	report			info	KMSAN: uninit-value in batadv_get_vid
ci-upstream-kmsan-gce-386	2022/01/07 22:43	https://github.com/google/kmsan.git master	81c325bbf94e	2ca0d385	.config	log	report			info	KMSAN: uninit-value in batadv_get_vid
ci-upstream-kmsan-gce-386	2022/01/07 22:43	https://github.com/google/kmsan.git master	81c325bbf94e	2ca0d385	.config	log	report			info	KMSAN: uninit-value in batadv_get_vid
ci-upstream-kmsan-gce-386	2022/01/07 21:26	https://github.com/google/kmsan.git master	81c325bbf94e	2ca0d385	.config	log	report			info	KMSAN: uninit-value in batadv_get_vid
ci-upstream-kmsan-gce-386	2022/01/07 12:30	https://github.com/google/kmsan.git master	81c325bbf94e	6acc789a	.config	log	report			info	KMSAN: uninit-value in batadv_get_vid
ci-upstream-kmsan-gce-386	2022/01/07 08:39	https://github.com/google/kmsan.git master	81c325bbf94e	6acc789a	.config	log	report			info	KMSAN: uninit-value in batadv_get_vid
ci-upstream-kmsan-gce-386	2022/01/06 06:54	https://github.com/google/kmsan.git master	81c325bbf94e	6acc789a	.config	log	report			info	KMSAN: uninit-value in batadv_get_vid
ci-upstream-kmsan-gce-386	2022/01/06 05:42	https://github.com/google/kmsan.git master	81c325bbf94e	6acc789a	.config	log	report			info	KMSAN: uninit-value in batadv_get_vid
ci-upstream-kmsan-gce-386	2022/01/05 22:46	https://github.com/google/kmsan.git master	81c325bbf94e	6acc789a	.config	log	report			info	KMSAN: uninit-value in batadv_get_vid
ci-upstream-kmsan-gce-386	2022/01/05 01:19	https://github.com/google/kmsan.git master	81c325bbf94e	0a2584dd	.config	log	report			info	KMSAN: uninit-value in batadv_get_vid
ci-upstream-kmsan-gce-386	2022/01/05 01:00	https://github.com/google/kmsan.git master	81c325bbf94e	0a2584dd	.config	log	report			info	KMSAN: uninit-value in batadv_get_vid
ci-upstream-kmsan-gce-386	2022/01/04 23:15	https://github.com/google/kmsan.git master	81c325bbf94e	0a2584dd	.config	log	report			info	KMSAN: uninit-value in batadv_get_vid
ci-upstream-kmsan-gce-386	2022/01/04 10:15	https://github.com/google/kmsan.git master	81c325bbf94e	7f723fbe	.config	log	report			info	KMSAN: uninit-value in batadv_get_vid
ci-upstream-kmsan-gce-386	2022/01/04 09:14	https://github.com/google/kmsan.git master	81c325bbf94e	7f723fbe	.config	log	report			info	KMSAN: uninit-value in batadv_get_vid
ci-upstream-kmsan-gce-386	2022/01/03 22:54	https://github.com/google/kmsan.git master	81c325bbf94e	4a3f34f2	.config	log	report			info	KMSAN: uninit-value in batadv_get_vid
ci-upstream-kmsan-gce-386	2022/01/03 21:38	https://github.com/google/kmsan.git master	81c325bbf94e	4a3f34f2	.config	log	report			info	KMSAN: uninit-value in batadv_get_vid
ci-upstream-kmsan-gce-386	2022/01/01 15:43	https://github.com/google/kmsan.git master	81c325bbf94e	e1768e9c	.config	log	report			info	KMSAN: uninit-value in batadv_get_vid
ci-upstream-kmsan-gce-386	2022/01/01 02:38	https://github.com/google/kmsan.git master	81c325bbf94e	e1768e9c	.config	log	report			info	KMSAN: uninit-value in batadv_get_vid
ci-upstream-kmsan-gce-386	2022/01/01 01:15	https://github.com/google/kmsan.git master	81c325bbf94e	e1768e9c	.config	log	report			info	KMSAN: uninit-value in batadv_get_vid
ci-upstream-kmsan-gce-386	2022/01/01 00:06	https://github.com/google/kmsan.git master	81c325bbf94e	e1768e9c	.config	log	report			info	KMSAN: uninit-value in batadv_get_vid
ci-upstream-kmsan-gce-386	2021/12/31 09:07	https://github.com/google/kmsan.git master	81c325bbf94e	36bd2e48	.config	log	report			info	KMSAN: uninit-value in batadv_get_vid
ci-upstream-kmsan-gce-386	2021/12/31 07:53	https://github.com/google/kmsan.git master	81c325bbf94e	36bd2e48	.config	log	report			info	KMSAN: uninit-value in batadv_get_vid
ci-upstream-kmsan-gce-386	2021/12/29 02:10	https://github.com/google/kmsan.git master	81c325bbf94e	76c8cf06	.config	log	report			info	KMSAN: uninit-value in batadv_get_vid
ci-upstream-kmsan-gce-386	2021/12/29 01:16	https://github.com/google/kmsan.git master	81c325bbf94e	76c8cf06	.config	log	report			info	KMSAN: uninit-value in batadv_get_vid
ci-upstream-kmsan-gce-386	2021/12/29 00:00	https://github.com/google/kmsan.git master	81c325bbf94e	76c8cf06	.config	log	report			info	KMSAN: uninit-value in batadv_get_vid
ci-upstream-kmsan-gce-386	2021/12/28 22:49	https://github.com/google/kmsan.git master	81c325bbf94e	76c8cf06	.config	log	report			info	KMSAN: uninit-value in batadv_get_vid
ci-upstream-kmsan-gce-386	2021/12/28 09:44	https://github.com/google/kmsan.git master	81c325bbf94e	6b3c5e64	.config	log	report			info	KMSAN: uninit-value in batadv_get_vid
ci-upstream-kmsan-gce-386	2021/12/28 06:44	https://github.com/google/kmsan.git master	81c325bbf94e	6b3c5e64	.config	log	report			info	KMSAN: uninit-value in batadv_get_vid
ci-upstream-kmsan-gce-386	2021/12/27 20:55	https://github.com/google/kmsan.git master	81c325bbf94e	5140bd58	.config	log	report			info	KMSAN: uninit-value in batadv_get_vid
ci-upstream-kmsan-gce-386	2021/12/27 04:11	https://github.com/google/kmsan.git master	81c325bbf94e	e4f103c4	.config	log	report			info	KMSAN: uninit-value in batadv_get_vid
ci-upstream-kmsan-gce-386	2021/12/26 17:57	https://github.com/google/kmsan.git master	81c325bbf94e	e4f103c4	.config	log	report			info	KMSAN: uninit-value in batadv_get_vid
ci-upstream-kmsan-gce-386	2021/12/24 20:28	https://github.com/google/kmsan.git master	81c325bbf94e	6caa12e4	.config	log	report			info	KMSAN: uninit-value in batadv_get_vid
ci-upstream-kmsan-gce-386	2021/12/22 10:14	https://github.com/google/kmsan.git master	81c325bbf94e	6caa12e4	.config	log	report			info	KMSAN: uninit-value in batadv_get_vid
ci-upstream-kmsan-gce-386	2021/01/16 20:47	https://github.com/google/kmsan.git master	73d62e81b476	65a7a854	.config	log	report			info
ci-upstream-kmsan-gce-386	2020/02/21 03:30	https://github.com/google/kmsan.git master	8bbbc5cf3dca	bd2a74a3	.config	log	report