BUG: spinlock bad magic on CPU#1, syz-executor.3/3660 lock: 0xffff8880b9b00040, .magic: 00000000, .owner: /-1, .owner_cpu: 0 CPU: 1 PID: 3660 Comm: syz-executor.3 Not tainted 5.15.157-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e3/0x2d0 lib/dump_stack.c:106 debug_spin_lock_before kernel/locking/spinlock_debug.c:85 [inline] do_raw_spin_lock+0x200/0x370 kernel/locking/spinlock_debug.c:114 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:117 [inline] _raw_spin_lock_irqsave+0xdd/0x120 kernel/locking/spinlock.c:162 srcu_might_be_idle kernel/rcu/srcutree.c:767 [inline] synchronize_srcu+0xb3/0x1c0 kernel/rcu/srcutree.c:1008 blk_mq_quiesce_queue+0x112/0x1d0 block/blk-mq.c:240 nbd_clear_que drivers/block/nbd.c:848 [inline] nbd_clear_sock drivers/block/nbd.c:1240 [inline] nbd_clear_sock_ioctl drivers/block/nbd.c:1379 [inline] __nbd_ioctl drivers/block/nbd.c:1407 [inline] nbd_ioctl+0x2bb/0xe10 drivers/block/nbd.c:1467 blkdev_ioctl+0x333/0x6b0 block/ioctl.c:604 block_ioctl+0xb1/0xf0 block/fops.c:493 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:874 [inline] __se_sys_ioctl+0xf1/0x160 fs/ioctl.c:860 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7f78d2638ea9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 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 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f78d0b690c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f78d2767120 RCX: 00007f78d2638ea9 RDX: 0000000000000000 RSI: 000000000000ab04 RDI: 0000000000000009 RBP: 00007f78d26854a4 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000006e R14: 00007f78d2767120 R15: 00007ffd40415798 general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] CPU: 1 PID: 3660 Comm: syz-executor.3 Not tainted 5.15.157-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 RIP: 0010:rcu_segcblist_enqueue+0x9c/0xc0 kernel/rcu/rcu_segcblist.c:348 Code: c7 06 00 00 00 00 48 83 c3 20 48 89 d8 48 c1 e8 03 42 80 3c 20 00 74 08 48 89 df e8 9e 76 5d 00 4c 8b 3b 4c 89 f8 48 c1 e8 03 <42> 80 3c 20 00 74 08 4c 89 ff e8 05 77 5d 00 4d 89 37 4c 89 33 5b RSP: 0018:ffffc90004477a58 EFLAGS: 00010046 RAX: 0000000000000000 RBX: ffff8880b9b000a0 RCX: 0000000000000001 RDX: dffffc0000000000 RSI: ffffc90004477b80 RDI: ffff8880b9b000c8 RBP: 1ffff1100f690ca7 R08: dffffc0000000000 R09: 0000000000000003 R10: ffffffffffffffff R11: dffffc0000000001 R12: dffffc0000000000 R13: ffff8880b9b00040 R14: ffffc90004477b80 R15: 0000000000000000 FS: 00007f78d0b696c0(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000200012c0 CR3: 00000000731be000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: srcu_gp_start_if_needed+0x156/0x8f0 kernel/rcu/srcutree.c:823 __call_srcu kernel/rcu/srcutree.c:883 [inline] __synchronize_srcu+0x2b1/0x360 kernel/rcu/srcutree.c:929 blk_mq_quiesce_queue+0x112/0x1d0 block/blk-mq.c:240 nbd_clear_que drivers/block/nbd.c:848 [inline] nbd_clear_sock drivers/block/nbd.c:1240 [inline] nbd_clear_sock_ioctl drivers/block/nbd.c:1379 [inline] __nbd_ioctl drivers/block/nbd.c:1407 [inline] nbd_ioctl+0x2bb/0xe10 drivers/block/nbd.c:1467 blkdev_ioctl+0x333/0x6b0 block/ioctl.c:604 block_ioctl+0xb1/0xf0 block/fops.c:493 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:874 [inline] __se_sys_ioctl+0xf1/0x160 fs/ioctl.c:860 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7f78d2638ea9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 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 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f78d0b690c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f78d2767120 RCX: 00007f78d2638ea9 RDX: 0000000000000000 RSI: 000000000000ab04 RDI: 0000000000000009 RBP: 00007f78d26854a4 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000006e R14: 00007f78d2767120 R15: 00007ffd40415798 Modules linked in: ---[ end trace 628c6def0a6e0b6b ]--- RIP: 0010:rcu_segcblist_enqueue+0x9c/0xc0 kernel/rcu/rcu_segcblist.c:348 Code: c7 06 00 00 00 00 48 83 c3 20 48 89 d8 48 c1 e8 03 42 80 3c 20 00 74 08 48 89 df e8 9e 76 5d 00 4c 8b 3b 4c 89 f8 48 c1 e8 03 <42> 80 3c 20 00 74 08 4c 89 ff e8 05 77 5d 00 4d 89 37 4c 89 33 5b RSP: 0018:ffffc90004477a58 EFLAGS: 00010046 RAX: 0000000000000000 RBX: ffff8880b9b000a0 RCX: 0000000000000001 RDX: dffffc0000000000 RSI: ffffc90004477b80 RDI: ffff8880b9b000c8 RBP: 1ffff1100f690ca7 R08: dffffc0000000000 R09: 0000000000000003 R10: ffffffffffffffff R11: dffffc0000000001 R12: dffffc0000000000 R13: ffff8880b9b00040 R14: ffffc90004477b80 R15: 0000000000000000 FS: 00007f78d0b696c0(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000200012c0 CR3: 00000000731be000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: c7 06 00 00 00 00 movl $0x0,(%rsi) 6: 48 83 c3 20 add $0x20,%rbx a: 48 89 d8 mov %rbx,%rax d: 48 c1 e8 03 shr $0x3,%rax 11: 42 80 3c 20 00 cmpb $0x0,(%rax,%r12,1) 16: 74 08 je 0x20 18: 48 89 df mov %rbx,%rdi 1b: e8 9e 76 5d 00 call 0x5d76be 20: 4c 8b 3b mov (%rbx),%r15 23: 4c 89 f8 mov %r15,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 42 80 3c 20 00 cmpb $0x0,(%rax,%r12,1) <-- trapping instruction 2f: 74 08 je 0x39 31: 4c 89 ff mov %r15,%rdi 34: e8 05 77 5d 00 call 0x5d773e 39: 4d 89 37 mov %r14,(%r15) 3c: 4c 89 33 mov %r14,(%rbx) 3f: 5b pop %rbx