netlink: 'syz-executor6': attribute type 4 has an invalid length.
netlink: 17 bytes leftover after parsing attributes in process `syz-executor6'.
======================================================
WARNING: possible circular locking dependency detected
4.17.0-rc6+ #66 Not tainted
------------------------------------------------------
syz-executor3/5078 is trying to acquire lock:
00000000ccbaa169 (rlock-AF_UNIX){+.+.}, at: skb_queue_tail+0x26/0x150 net/core/skbuff.c:2915
but task is already holding lock:
00000000dd0f3fae (&(&u->lock)->rlock/1){+.+.}, at: unix_state_double_lock+0x80/0xb0 net/unix/af_unix.c:1078
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #1 (&(&u->lock)->rlock/1){+.+.}:
_raw_spin_lock_nested+0x28/0x40 kernel/locking/spinlock.c:354
sk_diag_dump_icons net/unix/diag.c:82 [inline]
sk_diag_fill.isra.5+0xa43/0x10d0 net/unix/diag.c:144
sk_diag_dump net/unix/diag.c:178 [inline]
unix_diag_dump+0x35f/0x550 net/unix/diag.c:206
netlink_dump+0x507/0xd20 net/netlink/af_netlink.c:2226
__netlink_dump_start+0x51a/0x780 net/netlink/af_netlink.c:2323
netlink_dump_start include/linux/netlink.h:214 [inline]
unix_diag_handler_dump+0x3f4/0x7b0 net/unix/diag.c:307
__sock_diag_cmd net/core/sock_diag.c:230 [inline]
sock_diag_rcv_msg+0x2e0/0x3d0 net/core/sock_diag.c:261
netlink_rcv_skb+0x172/0x440 net/netlink/af_netlink.c:2448
sock_diag_rcv+0x2a/0x40 net/core/sock_diag.c:272
netlink_unicast_kernel net/netlink/af_netlink.c:1310 [inline]
netlink_unicast+0x58b/0x740 net/netlink/af_netlink.c:1336
netlink_sendmsg+0x9f0/0xfa0 net/netlink/af_netlink.c:1901
sock_sendmsg_nosec net/socket.c:629 [inline]
sock_sendmsg+0xd5/0x120 net/socket.c:639
sock_write_iter+0x35a/0x5a0 net/socket.c:908
call_write_iter include/linux/fs.h:1784 [inline]
new_sync_write fs/read_write.c:474 [inline]
__vfs_write+0x64d/0x960 fs/read_write.c:487
vfs_write+0x1f8/0x560 fs/read_write.c:549
ksys_write+0xf9/0x250 fs/read_write.c:598
__do_sys_write fs/read_write.c:610 [inline]
__se_sys_write fs/read_write.c:607 [inline]
__x64_sys_write+0x73/0xb0 fs/read_write.c:607
do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287
entry_SYSCALL_64_after_hwframe+0x49/0xbe
-> #0 (rlock-AF_UNIX){+.+.}:
lock_acquire+0x1dc/0x520 kernel/locking/lockdep.c:3920
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0x96/0xc0 kernel/locking/spinlock.c:152
skb_queue_tail+0x26/0x150 net/core/skbuff.c:2915
unix_dgram_sendmsg+0xf77/0x1730 net/unix/af_unix.c:1797
sock_sendmsg_nosec net/socket.c:629 [inline]
sock_sendmsg+0xd5/0x120 net/socket.c:639
___sys_sendmsg+0x525/0x940 net/socket.c:2117
__sys_sendmmsg+0x240/0x6f0 net/socket.c:2212
__do_sys_sendmmsg net/socket.c:2241 [inline]
__se_sys_sendmmsg net/socket.c:2238 [inline]
__x64_sys_sendmmsg+0x9d/0x100 net/socket.c:2238
do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287
entry_SYSCALL_64_after_hwframe+0x49/0xbe
other info that might help us debug this:
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(&(&u->lock)->rlock/1);
lock(rlock-AF_UNIX);
lock(&(&u->lock)->rlock/1);
lock(rlock-AF_UNIX);
*** DEADLOCK ***
1 lock held by syz-executor3/5078:
#0: 00000000dd0f3fae (&(&u->lock)->rlock/1){+.+.}, at: unix_state_double_lock+0x80/0xb0 net/unix/af_unix.c:1078
stack backtrace:
CPU: 0 PID: 5078 Comm: syz-executor3 Not tainted 4.17.0-rc6+ #66
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+0x1b9/0x294 lib/dump_stack.c:113
print_circular_bug.isra.36.cold.54+0x1bd/0x27d kernel/locking/lockdep.c:1223
check_prev_add kernel/locking/lockdep.c:1863 [inline]
check_prevs_add kernel/locking/lockdep.c:1976 [inline]
validate_chain kernel/locking/lockdep.c:2417 [inline]
__lock_acquire+0x343e/0x5140 kernel/locking/lockdep.c:3431
lock_acquire+0x1dc/0x520 kernel/locking/lockdep.c:3920
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0x96/0xc0 kernel/locking/spinlock.c:152
skb_queue_tail+0x26/0x150 net/core/skbuff.c:2915
unix_dgram_sendmsg+0xf77/0x1730 net/unix/af_unix.c:1797
sock_sendmsg_nosec net/socket.c:629 [inline]
sock_sendmsg+0xd5/0x120 net/socket.c:639
___sys_sendmsg+0x525/0x940 net/socket.c:2117
__sys_sendmmsg+0x240/0x6f0 net/socket.c:2212
__do_sys_sendmmsg net/socket.c:2241 [inline]
__se_sys_sendmmsg net/socket.c:2238 [inline]
__x64_sys_sendmmsg+0x9d/0x100 net/socket.c:2238
do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x455a09
RSP: 002b:00007f7d8e761c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000133
RAX: ffffffffffffffda RBX: 00007f7d8e7626d4 RCX: 0000000000455a09
RDX: fffffffffffffdc3 RSI: 00000000200bd000 RDI: 0000000000000018
RBP: 000000000072bf50 R08: 0000000000000000 R09: 0000000000000000
R10: 5a6d8d97750cae5e R11: 0000000000000246 R12: 00000000ffffffff
R13: 000000000000057e R14: 00000000006fc470 R15: 0000000000000001
netlink: 3 bytes leftover after parsing attributes in process `syz-executor0'.
ieee80211 phy4: Selected rate control algorithm 'minstrel_ht'
netlink: 3 bytes leftover after parsing attributes in process `syz-executor0'.
ieee80211 phy5: Selected rate control algorithm 'minstrel_ht'
ieee80211 phy6: Selected rate control algorithm 'minstrel_ht'
ieee80211 phy7: Selected rate control algorithm 'minstrel_ht'
ieee80211 phy8: Selected rate control algorithm 'minstrel_ht'
ieee80211 phy9: Selected rate control algorithm 'minstrel_ht'
ieee80211 phy10: Selected rate control algorithm 'minstrel_ht'
ieee80211 phy11: Selected rate control algorithm 'minstrel_ht'
ieee80211 phy12: Selected rate control algorithm 'minstrel_ht'
ieee80211 phy13: Selected rate control algorithm 'minstrel_ht'
ieee80211 phy14: Selected rate control algorithm 'minstrel_ht'
ieee80211 phy15: Selected rate control algorithm 'minstrel_ht'
ieee80211 phy16: Selected rate control algorithm 'minstrel_ht'
ieee80211 phy17: Selected rate control algorithm 'minstrel_ht'
ieee80211 phy18: Selected rate control algorithm 'minstrel_ht'
ieee80211 phy19: Selected rate control algorithm 'minstrel_ht'
ieee80211 phy20: Selected rate control algorithm 'minstrel_ht'
ieee80211 phy21: Selected rate control algorithm 'minstrel_ht'
ieee80211 phy22: Selected rate control algorithm 'minstrel_ht'
ieee80211 phy23: Selected rate control algorithm 'minstrel_ht'
ieee80211 phy24: Selected rate control algorithm 'minstrel_ht'
ieee80211 phy25: Selected rate control algorithm 'minstrel_ht'
ieee80211 phy26: Selected rate control algorithm 'minstrel_ht'
ieee80211 phy27: Selected rate control algorithm 'minstrel_ht'
ieee80211 phy28: Selected rate control algorithm 'minstrel_ht'