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Date: Wed, 18 Nov 2020 06:26:19 -0800
From: syzbot <syzbot+1bc48bf7f78253f664a9@...kaller.appspotmail.com>
To: dledford@...hat.com, jgg@...pe.ca, leon@...nel.org,
linux-kernel@...r.kernel.org, linux-rdma@...r.kernel.org,
parav@...lanox.com, syzkaller-bugs@...glegroups.com
Subject: Re: possible deadlock in _destroy_id
syzbot has found a reproducer for the following issue on:
HEAD commit: 20529233 Add linux-next specific files for 20201118
git tree: linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=16ce97be500000
kernel config: https://syzkaller.appspot.com/x/.config?x=2c4fb58b6526b3c1
dashboard link: https://syzkaller.appspot.com/bug?extid=1bc48bf7f78253f664a9
compiler: gcc (GCC) 10.1.0-syz 20200507
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=10b53981500000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=10e94c7e500000
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+1bc48bf7f78253f664a9@...kaller.appspotmail.com
wlan1 speed is unknown, defaulting to 1000
iwpm_register_pid: Unable to send a nlmsg (client = 2)
infiniband syz2: RDMA CMA: cma_listen_on_dev, error -98
============================================
WARNING: possible recursive locking detected
5.10.0-rc4-next-20201118-syzkaller #0 Not tainted
--------------------------------------------
syz-executor872/8502 is trying to acquire lock:
ffffffff8c684748 (lock#6){+.+.}-{3:3}, at: cma_release_dev drivers/infiniband/core/cma.c:476 [inline]
ffffffff8c684748 (lock#6){+.+.}-{3:3}, at: _destroy_id+0x299/0xa00 drivers/infiniband/core/cma.c:1852
but task is already holding lock:
ffffffff8c684748 (lock#6){+.+.}-{3:3}, at: cma_add_one+0x55c/0xce0 drivers/infiniband/core/cma.c:4902
other info that might help us debug this:
Possible unsafe locking scenario:
CPU0
----
lock(lock#6);
lock(lock#6);
*** DEADLOCK ***
May be due to missing lock nesting notation
6 locks held by syz-executor872/8502:
#0: ffffffff8fa76958 (&rdma_nl_types[idx].sem){.+.+}-{3:3}, at: rdma_nl_rcv_msg+0x15b/0x690 drivers/infiniband/core/netlink.c:164
#1: ffffffff8c66c490 (link_ops_rwsem){++++}-{3:3}, at: nldev_newlink+0x261/0x540 drivers/infiniband/core/nldev.c:1545
#2: ffffffff8c65bd90 (devices_rwsem){++++}-{3:3}, at: enable_device_and_get+0xfc/0x3c0 drivers/infiniband/core/device.c:1321
#3: ffffffff8c65bc50 (clients_rwsem){++++}-{3:3}, at: enable_device_and_get+0x163/0x3c0 drivers/infiniband/core/device.c:1331
#4: ffff888026f28598 (&device->client_data_rwsem){++++}-{3:3}, at: add_client_context+0x3d0/0x5e0 drivers/infiniband/core/device.c:710
#5: ffffffff8c684748 (lock#6){+.+.}-{3:3}, at: cma_add_one+0x55c/0xce0 drivers/infiniband/core/cma.c:4902
stack backtrace:
CPU: 1 PID: 8502 Comm: syz-executor872 Not tainted 5.10.0-rc4-next-20201118-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:79 [inline]
dump_stack+0x107/0x163 lib/dump_stack.c:120
print_deadlock_bug kernel/locking/lockdep.c:2759 [inline]
check_deadlock kernel/locking/lockdep.c:2802 [inline]
validate_chain kernel/locking/lockdep.c:3593 [inline]
__lock_acquire.cold+0x115/0x39f kernel/locking/lockdep.c:4830
lock_acquire kernel/locking/lockdep.c:5435 [inline]
lock_acquire+0x2a3/0x8c0 kernel/locking/lockdep.c:5400
__mutex_lock_common kernel/locking/mutex.c:956 [inline]
__mutex_lock+0x134/0x1110 kernel/locking/mutex.c:1103
cma_release_dev drivers/infiniband/core/cma.c:476 [inline]
_destroy_id+0x299/0xa00 drivers/infiniband/core/cma.c:1852
cma_listen_on_dev.cold+0x168/0x16d drivers/infiniband/core/cma.c:2535
cma_add_one+0x667/0xce0 drivers/infiniband/core/cma.c:4905
add_client_context+0x405/0x5e0 drivers/infiniband/core/device.c:712
enable_device_and_get+0x1d5/0x3c0 drivers/infiniband/core/device.c:1333
ib_register_device drivers/infiniband/core/device.c:1408 [inline]
ib_register_device+0x7a0/0xa30 drivers/infiniband/core/device.c:1367
siw_device_register drivers/infiniband/sw/siw/siw_main.c:72 [inline]
siw_newlink drivers/infiniband/sw/siw/siw_main.c:545 [inline]
siw_newlink+0xddb/0x1340 drivers/infiniband/sw/siw/siw_main.c:522
nldev_newlink+0x30e/0x540 drivers/infiniband/core/nldev.c:1555
rdma_nl_rcv_msg+0x367/0x690 drivers/infiniband/core/netlink.c:195
rdma_nl_rcv_skb drivers/infiniband/core/netlink.c:239 [inline]
rdma_nl_rcv+0x2f2/0x440 drivers/infiniband/core/netlink.c:259
netlink_unicast_kernel net/netlink/af_netlink.c:1304 [inline]
netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1330
netlink_sendmsg+0x856/0xd90 net/netlink/af_netlink.c:1919
sock_sendmsg_nosec net/socket.c:650 [inline]
sock_sendmsg+0xcf/0x120 net/socket.c:670
____sys_sendmsg+0x6e8/0x810 net/socket.c:2339
___sys_sendmsg+0xf3/0x170 net/socket.c:2393
__sys_sendmsg+0xe5/0x1b0 net/socket.c:2426
do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x440339
Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 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 7b 13 fc ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fff91ac9ae8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440339
RDX: 0000000000000000 RSI: 00000000200002c0 RDI: 0000000000000003
RBP: 00000000006ca018 R08: 0000000000000014 R09: 00000000004002c8
R10: 0000000000000041 R11: 0000000000000246 R12: 0000000000401b40
R13: 0000000000401bd0 R14: 0000000000000000 R15: 0000000000000000
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