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Date: Sun, 08 Aug 2021 16:38:18 -0700
From: syzbot <syzbot+8760ca6c1ee783ac4abd@...kaller.appspotmail.com>
To: andrii@...nel.org, ast@...nel.org, bpf@...r.kernel.org,
christian.brauner@...ntu.com, cong.wang@...edance.com,
daniel@...earbox.net, davem@...emloft.net, edumazet@...gle.com,
jamorris@...ux.microsoft.com, john.fastabend@...il.com,
kafai@...com, kpsingh@...nel.org, kuba@...nel.org,
linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org,
netdev@...r.kernel.org, rao.shoaib@...cle.com, shuah@...nel.org,
songliubraving@...com, syzkaller-bugs@...glegroups.com,
viro@...iv.linux.org.uk, yhs@...com
Subject: [syzbot] BUG: sleeping function called from invalid context in _copy_to_iter
Hello,
syzbot found the following issue on:
HEAD commit: c2eecaa193ff pktgen: Remove redundant clone_skb override
git tree: net-next
console output: https://syzkaller.appspot.com/x/log.txt?x=12e3a69e300000
kernel config: https://syzkaller.appspot.com/x/.config?x=aba0c23f8230e048
dashboard link: https://syzkaller.appspot.com/bug?extid=8760ca6c1ee783ac4abd
compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.1
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=15c5b104300000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=10062aaa300000
The issue was bisected to:
commit 314001f0bf927015e459c9d387d62a231fe93af3
Author: Rao Shoaib <rao.shoaib@...cle.com>
Date: Sun Aug 1 07:57:07 2021 +0000
af_unix: Add OOB support
bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=10765f8e300000
final oops: https://syzkaller.appspot.com/x/report.txt?x=12765f8e300000
console output: https://syzkaller.appspot.com/x/log.txt?x=14765f8e300000
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+8760ca6c1ee783ac4abd@...kaller.appspotmail.com
Fixes: 314001f0bf92 ("af_unix: Add OOB support")
BUG: sleeping function called from invalid context at lib/iov_iter.c:619
in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 8443, name: syz-executor700
2 locks held by syz-executor700/8443:
#0: ffff888028fa0d00 (&u->iolock){+.+.}-{3:3}, at: unix_stream_read_generic+0x16c6/0x2190 net/unix/af_unix.c:2501
#1: ffff888028fa0df0 (&u->lock){+.+.}-{2:2}, at: spin_lock include/linux/spinlock.h:354 [inline]
#1: ffff888028fa0df0 (&u->lock){+.+.}-{2:2}, at: unix_stream_read_generic+0x16d0/0x2190 net/unix/af_unix.c:2502
Preemption disabled at:
[<0000000000000000>] 0x0
CPU: 1 PID: 8443 Comm: syz-executor700 Not tainted 5.14.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:105
___might_sleep.cold+0x1f1/0x237 kernel/sched/core.c:9154
__might_fault+0x6e/0x180 mm/memory.c:5258
_copy_to_iter+0x199/0x1600 lib/iov_iter.c:619
copy_to_iter include/linux/uio.h:139 [inline]
simple_copy_to_iter+0x4c/0x70 net/core/datagram.c:519
__skb_datagram_iter+0x10f/0x770 net/core/datagram.c:425
skb_copy_datagram_iter+0x40/0x50 net/core/datagram.c:533
skb_copy_datagram_msg include/linux/skbuff.h:3620 [inline]
unix_stream_read_actor+0x78/0xc0 net/unix/af_unix.c:2701
unix_stream_recv_urg net/unix/af_unix.c:2433 [inline]
unix_stream_read_generic+0x17cd/0x2190 net/unix/af_unix.c:2504
unix_stream_recvmsg+0xb1/0xf0 net/unix/af_unix.c:2717
sock_recvmsg_nosec net/socket.c:944 [inline]
sock_recvmsg net/socket.c:962 [inline]
sock_recvmsg net/socket.c:958 [inline]
____sys_recvmsg+0x2c4/0x600 net/socket.c:2622
___sys_recvmsg+0x127/0x200 net/socket.c:2664
do_recvmmsg+0x24d/0x6d0 net/socket.c:2758
__sys_recvmmsg net/socket.c:2837 [inline]
__do_sys_recvmmsg net/socket.c:2860 [inline]
__se_sys_recvmmsg net/socket.c:2853 [inline]
__x64_sys_recvmmsg+0x20b/0x260 net/socket.c:2853
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x43ef39
Code: 28 c3 e8 2a 14 00 00 66 2e 0f 1f 84 00 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 73 01 c3 48 c7 c1 c0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffca8776d68 EFLAGS: 00000246 ORIG_RAX: 000000000000012b
RAX: ffffffffffffffda RBX: 0000000000400488 RCX: 000000000043ef39
RDX: 0000000000000700 RSI: 0000000020001140 RDI: 0000000000000004
RBP: 0000000000402f20 R08: 0000000000000000 R09: 0000000000400488
R10: 0000000000000007 R11: 0000000000000246 R12: 0000000000402fb0
R13: 0000000000000000 R14: 00000000004ac018 R15: 0000000000400488
=============================
[ BUG: Invalid wait context ]
5.14.0-rc3-syzkaller #0 Tainted: G W
-----------------------------
syz-executor700/8443 is trying to lock:
ffff8880212b6a28 (&mm->mmap_lock#2){++++}-{3:3}, at: __might_fault+0xa3/0x180 mm/memory.c:5260
other info that might help us debug this:
context-{4:4}
2 locks held by syz-executor700/8443:
#0: ffff888028fa0d00 (&u->iolock){+.+.}-{3:3}, at: unix_stream_read_generic+0x16c6/0x2190 net/unix/af_unix.c:2501
#1: ffff888028fa0df0 (&u->lock){+.+.}-{2:2}, at: spin_lock include/linux/spinlock.h:354 [inline]
#1: ffff888028fa0df0 (&u->lock){+.+.}-{2:2}, at: unix_stream_read_generic+0x16d0/0x2190 net/unix/af_unix.c:2502
stack backtrace:
CPU: 1 PID: 8443 Comm: syz-executor700 Tainted: G W 5.14.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:105
print_lock_invalid_wait_context kernel/locking/lockdep.c:4666 [inline]
check_wait_context kernel/locking/lockdep.c:4727 [inline]
__lock_acquire.cold+0x213/0x3ab kernel/locking/lockdep.c:4965
lock_acquire kernel/locking/lockdep.c:5625 [inline]
lock_acquire+0x1ab/0x510 kernel/locking/lockdep.c:5590
__might_fault mm/memory.c:5261 [inline]
__might_fault+0x106/0x180 mm/memory.c:5246
_copy_to_iter+0x199/0x1600 lib/iov_iter.c:619
copy_to_iter include/linux/uio.h:139 [inline]
simple_copy_to_iter+0x4c/0x70 net/core/datagram.c:519
__skb_datagram_iter+0x10f/0x770 net/core/datagram.c:425
skb_copy_datagram_iter+0x40/0x50 net/core/datagram.c:533
skb_copy_datagram_msg include/linux/skbuff.h:3620 [inline]
unix_stream_read_actor+0x78/0xc0 net/unix/af_unix.c:2701
unix_stream_recv_urg net/unix/af_unix.c:2433 [inline]
unix_stream_read_generic+0x17cd/0x2190 net/unix/af_unix.c:2504
unix_stream_recvmsg+0xb1/0xf0 net/unix/af_unix.c:2717
sock_recvmsg_nosec net/socket.c:944 [inline]
sock_recvmsg net/socket.c:962 [inline]
sock_recvmsg net/socket.c:958 [inline]
____sys_recvmsg+0x2c4/0x600 net/socket.c:2622
___sys_recvmsg+0x127/0x200 net/socket.c:2664
do_recvmmsg+0x24d/0x6d0 net/socket.c:2758
__sys_recvmmsg net/socket.c:2837 [inline]
__do_sys_recvmmsg net/socket.c:2860 [inline]
__se_sys_recvmmsg net/socket.c:2853 [inline]
__x64_sys_recvmmsg+0x20b/0x260 net/socket.c:2853
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x43ef39
Code: 28 c3 e8 2a 14 00 00 66 2e 0f 1f 84 00 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 73 01 c3 48 c7 c1 c0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffca8776d68 EFLAGS: 00000246 ORIG_RAX: 000000000000012b
RAX: ffffffffffffffda RBX: 0000000000400488 RCX: 000000000043ef39
RDX: 0000000000000700 RSI: 0000000020001140 RDI: 0000000000000004
RBP: 0000000000402f20 R08: 0000000000000000 R09: 0000000000400488
R10: 0000000000000007 R11: 0000000000000246 R12: 0000
---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzkaller@...glegroups.com.
syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
For information about bisection process see: https://goo.gl/tpsmEJ#bisection
syzbot can test patches for this issue, for details see:
https://goo.gl/tpsmEJ#testing-patches
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