watchdog: BUG: soft lockup - CPU#0 stuck for 22s! [syz-executor.5:16886] Modules linked in: irq event stamp: 34074 hardirqs last enabled at (34073): [] restore_regs_and_return_to_kernel+0x0/0x2a hardirqs last disabled at (34074): [] apic_timer_interrupt+0x8e/0xa0 arch/x86/entry/entry_64.S:793 softirqs last enabled at (29576): [] __do_softirq+0x68b/0x9ff kernel/softirq.c:314 softirqs last disabled at (29509): [] invoke_softirq kernel/softirq.c:368 [inline] softirqs last disabled at (29509): [] irq_exit+0x193/0x240 kernel/softirq.c:409 CPU: 0 PID: 16886 Comm: syz-executor.5 Not tainted 4.14.290-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022 task: ffff8880a110e080 task.stack: ffff888062e98000 RIP: 0010:__read_once_size include/linux/compiler.h:185 [inline] RIP: 0010:atomic_read arch/x86/include/asm/atomic.h:27 [inline] RIP: 0010:queued_write_lock_slowpath+0xcb/0x1d0 kernel/locking/qrwlock.c:139 RSP: 0018:ffff888062e9fd10 EFLAGS: 00000206 ORIG_RAX: ffffffffffffff10 RAX: 0000000000000101 RBX: ffffffff89dd8468 RCX: 00000000000052ff RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffffffff89dd8468 RBP: ffffffff89dd846c R08: ffffffff8b9ca2f8 R09: 0000000000040585 R10: ffff8880a110e958 R11: ffff8880a110e080 R12: 0000000000000003 R13: fffffbfff13bb08d R14: 00000000000000ff R15: ffff8880af6b1a90 FS: 0000555555f9c400(0000) GS:ffff8880ba400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f0e67eaa718 CR3: 000000008845f000 CR4: 00000000003406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: queued_write_lock include/asm-generic/qrwlock.h:134 [inline] do_raw_write_lock+0xc2/0x1d0 kernel/locking/spinlock_debug.c:203 bt_sock_unlink+0x1d/0x170 net/bluetooth/af_bluetooth.c:151 hci_sock_release+0xc1/0x4c0 net/bluetooth/hci_sock.c:855 __sock_release+0xcd/0x2b0 net/socket.c:602 sock_close+0x15/0x20 net/socket.c:1139 __fput+0x25f/0x7a0 fs/file_table.c:210 task_work_run+0x11f/0x190 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:191 [inline] exit_to_usermode_loop+0x1ad/0x200 arch/x86/entry/common.c:164 prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline] syscall_return_slowpath arch/x86/entry/common.c:270 [inline] do_syscall_64+0x4a3/0x640 arch/x86/entry/common.c:297 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x7f463e4b4e4b RSP: 002b:00007ffd529d24f0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000005 RCX: 00007f463e4b4e4b RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000004 RBP: 00007f463e616960 R08: 0000000000000000 R09: 00007f463e61a468 R10: 0000000000000000 R11: 0000000000000293 R12: 00000000002cefe5 R13: 00007f463e61b560 R14: 00007f463e615370 R15: 0000000000000005 Code: 75 dc 49 89 dd 49 89 dc 41 be ff 00 00 00 49 c1 ed 03 41 83 e4 07 48 b8 00 00 00 00 00 fc ff df 49 01 c5 41 83 c4 03 eb 02 f3 90 <41> 0f b6 45 00 41 38 c4 7c 08 84 c0 0f 85 9e 00 00 00 8b 03 83 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 skipped: idling at pc 0xffffffff8723f20e