[syzbot] KMSAN: uninit-value in stack_trace_consume_entry
From: syzbot
Date: Wed Aug 10 2022 - 02:13:26 EST
Hello,
syzbot found the following issue on:
HEAD commit: a58741ac26cc kmsan: don't compile memmove
git tree: https://github.com/google/kmsan.git master
console output: https://syzkaller.appspot.com/x/log.txt?x=13325fe3e00000
kernel config: https://syzkaller.appspot.com/x/.config?x=abbc202e1724cf37
dashboard link: https://syzkaller.appspot.com/bug?extid=227ae323c9d4c04c300a
compiler: clang version 10.0.0 (https://github.com/llvm/llvm-project/ c2443155a0fb245c8f17f2c1c72b6ea391e86e81)
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=11e2bc23e00000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=14915203e00000
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+227ae323c9d4c04c300a@xxxxxxxxxxxxxxxxxxxxxxxxx
=====================================================
BUG: KMSAN: uninit-value in stack_trace_consume_entry+0x171/0x310 kernel/stacktrace.c:89
CPU: 1 PID: 10926 Comm: syz-executor854 Not tainted 5.6.0-rc6-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
stack_trace_consume_entry+0x171/0x310 kernel/stacktrace.c:89
arch_stack_walk+0x317/0x3e0 arch/x86/kernel/stacktrace.c:27
stack_trace_save+0x117/0x1a0 kernel/stacktrace.c:123
kmsan_save_stack_with_flags mm/kmsan/kmsan.c:144 [inline]
kmsan_internal_chain_origin+0xad/0x130 mm/kmsan/kmsan.c:310
kmsan_memcpy_memmove_metadata+0x272/0x2e0 mm/kmsan/kmsan.c:247
kmsan_memcpy_metadata+0xb/0x10 mm/kmsan/kmsan.c:267
__msan_memcpy+0x43/0x50 mm/kmsan/kmsan_instr.c:116
sock_write_iter+0x4f6/0x6d0 net/socket.c:1005
call_write_iter include/linux/fs.h:1902 [inline]
new_sync_write fs/read_write.c:483 [inline]
__vfs_write+0xa5a/0xca0 fs/read_write.c:496
vfs_write+0x44a/0x8f0 fs/read_write.c:558
ksys_write+0x267/0x450 fs/read_write.c:611
__do_sys_write fs/read_write.c:623 [inline]
__se_sys_write+0x92/0xb0 fs/read_write.c:620
__x64_sys_write+0x4a/0x70 fs/read_write.c:620
do_syscall_64+0xb8/0x160 arch/x86/entry/common.c:296
entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x443dd9
Code: e8 2c e8 ff ff 48 83 c4 18 c3 0f 1f 80 00 00 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 8b 09 fc ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fffb6d37698 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000443dd9
RDX: 0000000000000018 RSI: 0000000020000280 RDI: 0000000000000003
RBP: 00007fffb6d376b0 R08: 0000000101bbbbbb R09: 0000000101bbbbbb
R10: 0000000000000004 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000404c80 R14: 0000000000000000 R15: 0000000000000000
Uninit was stored to memory at:
kmsan_save_stack_with_flags mm/kmsan/kmsan.c:144 [inline]
kmsan_internal_chain_origin+0xad/0x130 mm/kmsan/kmsan.c:310
__msan_chain_origin+0x50/0x90 mm/kmsan/kmsan_instr.c:165
stack_trace_consume_entry+0x27a/0x310 kernel/stacktrace.c:90
arch_stack_walk+0x317/0x3e0 arch/x86/kernel/stacktrace.c:27
stack_trace_save+0x117/0x1a0 kernel/stacktrace.c:123
kmsan_save_stack_with_flags mm/kmsan/kmsan.c:144 [inline]
kmsan_internal_chain_origin+0xad/0x130 mm/kmsan/kmsan.c:310
kmsan_memcpy_memmove_metadata+0x272/0x2e0 mm/kmsan/kmsan.c:247
kmsan_memcpy_metadata+0xb/0x10 mm/kmsan/kmsan.c:267
__msan_memcpy+0x43/0x50 mm/kmsan/kmsan_instr.c:116
sock_write_iter+0x4f6/0x6d0 net/socket.c:1005
call_write_iter include/linux/fs.h:1902 [inline]
new_sync_write fs/read_write.c:483 [inline]
__vfs_write+0xa5a/0xca0 fs/read_write.c:496
vfs_write+0x44a/0x8f0 fs/read_write.c:558
ksys_write+0x267/0x450 fs/read_write.c:611
__do_sys_write fs/read_write.c:623 [inline]
__se_sys_write+0x92/0xb0 fs/read_write.c:620
__x64_sys_write+0x4a/0x70 fs/read_write.c:620
do_syscall_64+0xb8/0x160 arch/x86/entry/common.c:296
entry_SYSCALL_64_after_hwframe+0x44/0xa9
Uninit was stored to memory at:
kmsan_save_stack_with_flags mm/kmsan/kmsan.c:144 [inline]
kmsan_internal_chain_origin+0xad/0x130 mm/kmsan/kmsan.c:310
__msan_chain_origin+0x50/0x90 mm/kmsan/kmsan_instr.c:165
stack_trace_save+0x193/0x1a0 kernel/stacktrace.c:117
kmsan_save_stack_with_flags mm/kmsan/kmsan.c:144 [inline]
kmsan_internal_chain_origin+0xad/0x130 mm/kmsan/kmsan.c:310
kmsan_memcpy_memmove_metadata+0x272/0x2e0 mm/kmsan/kmsan.c:247
kmsan_memcpy_metadata+0xb/0x10 mm/kmsan/kmsan.c:267
__msan_memcpy+0x43/0x50 mm/kmsan/kmsan_instr.c:116
sock_write_iter+0x4f6/0x6d0 net/socket.c:1005
call_write_iter include/linux/fs.h:1902 [inline]
new_sync_write fs/read_write.c:483 [inline]
__vfs_write+0xa5a/0xca0 fs/read_write.c:496
vfs_write+0x44a/0x8f0 fs/read_write.c:558
ksys_write+0x267/0x450 fs/read_write.c:611
__do_sys_write fs/read_write.c:623 [inline]
__se_sys_write+0x92/0xb0 fs/read_write.c:620
__x64_sys_write+0x4a/0x70 fs/read_write.c:620
do_syscall_64+0xb8/0x160 arch/x86/entry/common.c:296
entry_SYSCALL_64_after_hwframe+0x44/0xa9
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]
__alloc_skb+0x2fd/0xac0 net/core/skbuff.c:210
alloc_skb include/linux/skbuff.h:1081 [inline]
alloc_skb_with_frags+0x18c/0xa70 net/core/skbuff.c:5764
sock_alloc_send_pskb+0xada/0xc60 net/core/sock.c:2245
packet_alloc_skb net/packet/af_packet.c:2816 [inline]
packet_snd net/packet/af_packet.c:2911 [inline]
packet_sendmsg+0x66a0/0x93b0 net/packet/af_packet.c:2993
sock_sendmsg_nosec net/socket.c:652 [inline]
sock_sendmsg net/socket.c:672 [inline]
sock_write_iter+0x6bc/0x6d0 net/socket.c:1004
call_write_iter include/linux/fs.h:1902 [inline]
new_sync_write fs/read_write.c:483 [inline]
__vfs_write+0xa5a/0xca0 fs/read_write.c:496
vfs_write+0x44a/0x8f0 fs/read_write.c:558
ksys_write+0x267/0x450 fs/read_write.c:611
__do_sys_write fs/read_write.c:623 [inline]
__se_sys_write+0x92/0xb0 fs/read_write.c:620
__x64_sys_write+0x4a/0x70 fs/read_write.c:620
do_syscall_64+0xb8/0x160 arch/x86/entry/common.c:296
entry_SYSCALL_64_after_hwframe+0x44/0xa9
=====================================================
---
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