BUG: spinlock bad magic on CPU#0, syz-executor.5/12669
 lock: 0xffff8880ba000040, .magic: 00000000, .owner: <none>/-1, .owner_cpu: 0
CPU: 0 PID: 12669 Comm: syz-executor.5 Not tainted 5.12.0-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:79 [inline]
 dump_stack+0x93/0xc2 lib/dump_stack.c:120
 debug_spin_lock_before kernel/locking/spinlock_debug.c:83 [inline]
 do_raw_spin_lock+0x216/0x2b0 kernel/locking/spinlock_debug.c:112
 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:117 [inline]
 _raw_spin_lock_irqsave+0x41/0x50 kernel/locking/spinlock.c:159
 srcu_might_be_idle kernel/rcu/srcutree.c:772 [inline]
 synchronize_srcu+0x4f/0x1c0 kernel/rcu/srcutree.c:1010
 blk_mq_quiesce_queue+0xfc/0x190 block/blk-mq.c:233
 elevator_init_mq+0x248/0x350 block/elevator.c:682
 __device_add_disk+0x971/0x1030 block/genhd.c:580
 add_disk include/linux/genhd.h:231 [inline]
 nbd_dev_add+0x68e/0x880 drivers/block/nbd.c:1718
 nbd_genl_connect+0x42f/0x1290 drivers/block/nbd.c:1817
 genl_family_rcv_msg_doit+0x1e4/0x2f0 net/netlink/genetlink.c:739
 genl_family_rcv_msg net/netlink/genetlink.c:783 [inline]
 genl_rcv_msg+0x27a/0x4a0 net/netlink/genetlink.c:800
 netlink_rcv_skb+0x118/0x370 net/netlink/af_netlink.c:2502
 genl_rcv+0x1f/0x30 net/netlink/genetlink.c:811
 netlink_unicast_kernel net/netlink/af_netlink.c:1312 [inline]
 netlink_unicast+0x42e/0x700 net/netlink/af_netlink.c:1338
 netlink_sendmsg+0x70e/0xbe0 net/netlink/af_netlink.c:1927
 sock_sendmsg_nosec net/socket.c:654 [inline]
 sock_sendmsg+0xab/0xe0 net/socket.c:674
 ____sys_sendmsg+0x5bf/0x7a0 net/socket.c:2350
 ___sys_sendmsg+0xd3/0x150 net/socket.c:2404
 __sys_sendmsg+0xb2/0x140 net/socket.c:2433
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x466019
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:00007f04d63f1188 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 000000000056c008 RCX: 0000000000466019
RDX: 0000000002000800 RSI: 0000000020002580 RDI: 0000000000000004
RBP: 00000000004bd067 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056c008
R13: 00007ffd77ffc9bf R14: 00007f04d63f1300 R15: 0000000000022000
general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
CPU: 0 PID: 12669 Comm: syz-executor.5 Not tainted 5.12.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:rcu_segcblist_enqueue+0xb9/0x130 kernel/rcu/rcu_segcblist.c:349
Code: 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 75 4e 48 b8 00 00 00 00 00 fc ff df 48 8b 6b 20 48 89 ea 48 c1 ea 03 <80> 3c 02 00 75 21 48 89 75 00 48 89 73 20 48 83 c4 08 5b 5d c3 48
RSP: 0018:ffffc900037bf128 EFLAGS: 00010046
RAX: dffffc0000000000 RBX: ffff8880ba000080 RCX: ffffffff8151dd10
RDX: 0000000000000000 RSI: ffffc900037bf210 RDI: ffff8880ba0000a0
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000003
R10: fffff520006f7e17 R11: 6637303030302052 R12: ffffc900037bf210
R13: ffff8880ba000080 R14: 0000000000000000 R15: ffff8880ba000040
FS:  00007f04d63f1700(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f28f1ae501f CR3: 000000003aa90000 CR4: 00000000001506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 srcu_gp_start_if_needed+0x116/0xbc0 kernel/rcu/srcutree.c:828
 __call_srcu kernel/rcu/srcutree.c:888 [inline]
 __synchronize_srcu+0x1d1/0x280 kernel/rcu/srcutree.c:934
 blk_mq_quiesce_queue+0xfc/0x190 block/blk-mq.c:233
 elevator_init_mq+0x248/0x350 block/elevator.c:682
 __device_add_disk+0x971/0x1030 block/genhd.c:580
 add_disk include/linux/genhd.h:231 [inline]
 nbd_dev_add+0x68e/0x880 drivers/block/nbd.c:1718
 nbd_genl_connect+0x42f/0x1290 drivers/block/nbd.c:1817
 genl_family_rcv_msg_doit+0x1e4/0x2f0 net/netlink/genetlink.c:739
 genl_family_rcv_msg net/netlink/genetlink.c:783 [inline]
 genl_rcv_msg+0x27a/0x4a0 net/netlink/genetlink.c:800
 netlink_rcv_skb+0x118/0x370 net/netlink/af_netlink.c:2502
 genl_rcv+0x1f/0x30 net/netlink/genetlink.c:811
 netlink_unicast_kernel net/netlink/af_netlink.c:1312 [inline]
 netlink_unicast+0x42e/0x700 net/netlink/af_netlink.c:1338
 netlink_sendmsg+0x70e/0xbe0 net/netlink/af_netlink.c:1927
 sock_sendmsg_nosec net/socket.c:654 [inline]
 sock_sendmsg+0xab/0xe0 net/socket.c:674
 ____sys_sendmsg+0x5bf/0x7a0 net/socket.c:2350
 ___sys_sendmsg+0xd3/0x150 net/socket.c:2404
 __sys_sendmsg+0xb2/0x140 net/socket.c:2433
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x466019
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:00007f04d63f1188 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 000000000056c008 RCX: 0000000000466019
RDX: 0000000002000800 RSI: 0000000020002580 RDI: 0000000000000004
RBP: 00000000004bd067 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056c008
R13: 00007ffd77ffc9bf R14: 00007f04d63f1300 R15: 0000000000022000
Modules linked in:
---[ end trace 6b1fb8758ae881af ]---
RIP: 0010:rcu_segcblist_enqueue+0xb9/0x130 kernel/rcu/rcu_segcblist.c:349
Code: 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 75 4e 48 b8 00 00 00 00 00 fc ff df 48 8b 6b 20 48 89 ea 48 c1 ea 03 <80> 3c 02 00 75 21 48 89 75 00 48 89 73 20 48 83 c4 08 5b 5d c3 48
RSP: 0018:ffffc900037bf128 EFLAGS: 00010046
RAX: dffffc0000000000 RBX: ffff8880ba000080 RCX: ffffffff8151dd10
RDX: 0000000000000000 RSI: ffffc900037bf210 RDI: ffff8880ba0000a0
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000003
R10: fffff520006f7e17 R11: 6637303030302052 R12: ffffc900037bf210
R13: ffff8880ba000080 R14: 0000000000000000 R15: ffff8880ba000040
FS:  00007f04d63f1700(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f28f1ae501f CR3: 000000003aa90000 CR4: 00000000001506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400