BUG: sleeping function called from invalid context at kernel/locking/mutex.c:938
in_atomic(): 0, irqs_disabled(): 0, non_block: 0, pid: 27909, name: syz-executor.5
2 locks held by syz-executor.5/27909:
 #0: ffffffff8d6a5828 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:72 [inline]
 #0: ffffffff8d6a5828 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x3f9/0xad0 net/core/rtnetlink.c:5561
 #1: ffffffff8bf79320 (rcu_read_lock){....}-{1:2}, at: nla_ok include/net/netlink.h:1159 [inline]
 #1: ffffffff8bf79320 (rcu_read_lock){....}-{1:2}, at: do_setlink+0x27d0/0x3af0 net/core/rtnetlink.c:2868
Preemption disabled at:
[<0000000000000000>] 0x0
CPU: 1 PID: 27909 Comm: syz-executor.5 Not tainted 5.13.0-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:79 [inline]
 dump_stack+0x141/0x1d7 lib/dump_stack.c:120
 ___might_sleep.cold+0x1f1/0x237 kernel/sched/core.c:8338
 __mutex_lock_common kernel/locking/mutex.c:938 [inline]
 __mutex_lock+0xa9/0x10c0 kernel/locking/mutex.c:1104
 __ipv6_dev_mc_dec+0x5f/0x340 net/ipv6/mcast.c:965
 addrconf_leave_solict net/ipv6/addrconf.c:2182 [inline]
 addrconf_leave_solict net/ipv6/addrconf.c:2174 [inline]
 __ipv6_ifa_notify+0x5b6/0xa90 net/ipv6/addrconf.c:6099
 ipv6_ifa_notify net/ipv6/addrconf.c:6122 [inline]
 ipv6_del_addr+0x463/0xae0 net/ipv6/addrconf.c:1294
 addrconf_verify_rtnl+0xdbc/0x1220 net/ipv6/addrconf.c:4489
 inet6_set_iftoken net/ipv6/addrconf.c:5757 [inline]
 inet6_set_link_af+0x53c/0xc40 net/ipv6/addrconf.c:5833
 do_setlink+0x290d/0x3af0 net/core/rtnetlink.c:2875
 __rtnl_newlink+0xdcf/0x1710 net/core/rtnetlink.c:3385
 rtnl_newlink+0x64/0xa0 net/core/rtnetlink.c:3500
 rtnetlink_rcv_msg+0x44e/0xad0 net/core/rtnetlink.c:5564
 netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2504
 netlink_unicast_kernel net/netlink/af_netlink.c:1314 [inline]
 netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1340
 netlink_sendmsg+0x856/0xd90 net/netlink/af_netlink.c:1929
 sock_sendmsg_nosec net/socket.c:654 [inline]
 sock_sendmsg+0xcf/0x120 net/socket.c:674
 ____sys_sendmsg+0x6e8/0x810 net/socket.c:2350
 ___sys_sendmsg+0xf3/0x170 net/socket.c:2404
 __sys_sendmsg+0xe5/0x1b0 net/socket.c:2433
 do_syscall_64+0x3a/0xb0 arch/x86/entry/common.c:47
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x4665d9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f9e3b117188 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 000000000056c038 RCX: 00000000004665d9
RDX: 0000000000000000 RSI: 0000000020000080 RDI: 0000000000000005
RBP: 00000000004bfcb9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056c038
R13: 00007ffdae25800f R14: 00007f9e3b117300 R15: 0000000000022000

=============================
[ BUG: Invalid wait context ]
5.13.0-rc3-syzkaller #0 Tainted: G        W        
-----------------------------
syz-executor.5/27909 is trying to lock:
ffff88805bd7b530 (&idev->mc_lock){+.+.}-{3:3}, at: __ipv6_dev_mc_dec+0x5f/0x340 net/ipv6/mcast.c:965
other info that might help us debug this:
context-{4:4}
2 locks held by syz-executor.5/27909:
 #0: ffffffff8d6a5828 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:72 [inline]
 #0: ffffffff8d6a5828 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x3f9/0xad0 net/core/rtnetlink.c:5561
 #1: ffffffff8bf79320 (rcu_read_lock){....}-{1:2}, at: nla_ok include/net/netlink.h:1159 [inline]
 #1: ffffffff8bf79320 (rcu_read_lock){....}-{1:2}, at: do_setlink+0x27d0/0x3af0 net/core/rtnetlink.c:2868
stack backtrace:
CPU: 0 PID: 27909 Comm: syz-executor.5 Tainted: G        W         5.13.0-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:79 [inline]
 dump_stack+0x141/0x1d7 lib/dump_stack.c:120
 print_lock_invalid_wait_context kernel/locking/lockdep.c:4553 [inline]
 check_wait_context kernel/locking/lockdep.c:4614 [inline]
 __lock_acquire.cold+0xc8/0x3b4 kernel/locking/lockdep.c:4852
 lock_acquire kernel/locking/lockdep.c:5512 [inline]
 lock_acquire+0x1ab/0x740 kernel/locking/lockdep.c:5477
 __mutex_lock_common kernel/locking/mutex.c:959 [inline]
 __mutex_lock+0x139/0x10c0 kernel/locking/mutex.c:1104
 __ipv6_dev_mc_dec+0x5f/0x340 net/ipv6/mcast.c:965
 addrconf_leave_solict net/ipv6/addrconf.c:2182 [inline]
 addrconf_leave_solict net/ipv6/addrconf.c:2174 [inline]
 __ipv6_ifa_notify+0x5b6/0xa90 net/ipv6/addrconf.c:6099
 ipv6_ifa_notify net/ipv6/addrconf.c:6122 [inline]
 ipv6_del_addr+0x463/0xae0 net/ipv6/addrconf.c:1294
 addrconf_verify_rtnl+0xdbc/0x1220 net/ipv6/addrconf.c:4489
 inet6_set_iftoken net/ipv6/addrconf.c:5757 [inline]
 inet6_set_link_af+0x53c/0xc40 net/ipv6/addrconf.c:5833
 do_setlink+0x290d/0x3af0 net/core/rtnetlink.c:2875
 __rtnl_newlink+0xdcf/0x1710 net/core/rtnetlink.c:3385
 rtnl_newlink+0x64/0xa0 net/core/rtnetlink.c:3500
 rtnetlink_rcv_msg+0x44e/0xad0 net/core/rtnetlink.c:5564
 netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2504
 netlink_unicast_kernel net/netlink/af_netlink.c:1314 [inline]
 netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1340
 netlink_sendmsg+0x856/0xd90 net/netlink/af_netlink.c:1929
 sock_sendmsg_nosec net/socket.c:654 [inline]
 sock_sendmsg+0xcf/0x120 net/socket.c:674
 ____sys_sendmsg+0x6e8/0x810 net/socket.c:2350
 ___sys_sendmsg+0xf3/0x170 net/socket.c:2404
 __sys_sendmsg+0xe5/0x1b0 net/socket.c:2433
 do_syscall_64+0x3a/0xb0 arch/x86/entry/common.c:47
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x4665d9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f9e3b117188 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 000000000056c038 RCX: 00000000004665d9
RDX: 0000000000000000 RSI: 0000000020000080 RDI: 0000000000000005
RBP: 00000000004bfcb9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056c038
R13: 00007ffdae25800f R14: 00007f9e3b117300 R15: 0000000000022000
BUG: sleeping function called from invalid context at kernel/locking/mutex.c:938
in_atomic(): 0, irqs_disabled(): 0, non_block: 0, pid: 27909, name: syz-executor.5
INFO: lockdep is turned off.
Preemption disabled at:
[<0000000000000000>] 0x0
CPU: 0 PID: 27909 Comm: syz-executor.5 Tainted: G        W         5.13.0-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:79 [inline]
 dump_stack+0x141/0x1d7 lib/dump_stack.c:120
 ___might_sleep.cold+0x1f1/0x237 kernel/sched/core.c:8338
 __mutex_lock_common kernel/locking/mutex.c:938 [inline]
 __mutex_lock+0xa9/0x10c0 kernel/locking/mutex.c:1104
 __ipv6_dev_mc_dec+0x5f/0x340 net/ipv6/mcast.c:965
 addrconf_leave_solict net/ipv6/addrconf.c:2182 [inline]
 addrconf_leave_solict net/ipv6/addrconf.c:2174 [inline]
 __ipv6_ifa_notify+0x5b6/0xa90 net/ipv6/addrconf.c:6099
 ipv6_ifa_notify net/ipv6/addrconf.c:6122 [inline]
 ipv6_del_addr+0x463/0xae0 net/ipv6/addrconf.c:1294
 addrconf_verify_rtnl+0xdbc/0x1220 net/ipv6/addrconf.c:4489
 inet6_set_iftoken net/ipv6/addrconf.c:5757 [inline]
 inet6_set_link_af+0x53c/0xc40 net/ipv6/addrconf.c:5833
 do_setlink+0x290d/0x3af0 net/core/rtnetlink.c:2875
 __rtnl_newlink+0xdcf/0x1710 net/core/rtnetlink.c:3385
 rtnl_newlink+0x64/0xa0 net/core/rtnetlink.c:3500
 rtnetlink_rcv_msg+0x44e/0xad0 net/core/rtnetlink.c:5564
 netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2504
 netlink_unicast_kernel net/netlink/af_netlink.c:1314 [inline]
 netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1340
 netlink_sendmsg+0x856/0xd90 net/netlink/af_netlink.c:1929
 sock_sendmsg_nosec net/socket.c:654 [inline]
 sock_sendmsg+0xcf/0x120 net/socket.c:674
 ____sys_sendmsg+0x6e8/0x810 net/socket.c:2350
 ___sys_sendmsg+0xf3/0x170 net/socket.c:2404
 __sys_sendmsg+0xe5/0x1b0 net/socket.c:2433
 do_syscall_64+0x3a/0xb0 arch/x86/entry/common.c:47
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x4665d9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f9e3b117188 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 000000000056c038 RCX: 00000000004665d9
RDX: 0000000000000000 RSI: 0000000020000080 RDI: 0000000000000005
RBP: 00000000004bfcb9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056c038
R13: 00007ffdae25800f R14: 00007f9e3b117300 R15: 0000000000022000