watchdog: BUG: soft lockup - CPU#1 stuck for 114s! [syz-executor6:22910] Modules linked in: irq event stamp: 34638 hardirqs last enabled at (34637): [] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline] hardirqs last enabled at (34637): [] _raw_spin_unlock_irqrestore+0x74/0xc0 kernel/locking/spinlock.c:184 hardirqs last disabled at (34638): [] interrupt_entry+0xb5/0xf0 arch/x86/entry/entry_64.S:625 softirqs last enabled at (6300): [] __do_softirq+0x780/0xb17 kernel/softirq.c:318 softirqs last disabled at (6283): [] invoke_softirq kernel/softirq.c:372 [inline] softirqs last disabled at (6283): [] irq_exit+0x1d4/0x210 kernel/softirq.c:412 CPU: 1 PID: 22910 Comm: syz-executor6 Not tainted 4.18.0-rc5+ #57 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:783 [inline] RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline] RIP: 0010:_raw_spin_unlock_irqrestore+0xa1/0xc0 kernel/locking/spinlock.c:184 Code: a8 b0 f1 88 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 75 21 48 83 3d fe 19 5f 01 00 74 0e 48 89 df 57 9d <0f> 1f 44 00 00 eb bb 0f 0b 0f 0b e8 1f 56 27 fa eb 97 e8 18 56 27 RSP: 0018:ffff88019661f750 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13 RAX: dffffc0000000000 RBX: 0000000000000286 RCX: 0000000000000000 RDX: 1ffffffff11e3615 RSI: 0000000000000001 RDI: 0000000000000286 RBP: ffff88019661f760 R08: ffffed003ad06472 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801d6832388 R13: ffff88019661f7e0 R14: 0000000000000001 R15: ffff8801acfe4c00 FS: 0000000000000000(0000) GS:ffff8801daf00000(0063) knlGS:00000000f5f6bb40 CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 CR2: 0000000000625208 CR3: 00000001c8c59000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: spin_unlock_irqrestore include/linux/spinlock.h:365 [inline] snd_virmidi_output_trigger+0x4d0/0x6b0 sound/core/seq/seq_virmidi.c:205 snd_rawmidi_output_trigger sound/core/rawmidi.c:150 [inline] snd_rawmidi_kernel_write1+0x519/0x700 sound/core/rawmidi.c:1288 snd_rawmidi_write+0x2ea/0xde0 sound/core/rawmidi.c:1338 __vfs_write+0x117/0x9f0 fs/read_write.c:485 vfs_write+0x1f8/0x560 fs/read_write.c:549 ksys_write+0x101/0x260 fs/read_write.c:598 __do_sys_write fs/read_write.c:610 [inline] __se_sys_write fs/read_write.c:607 [inline] __ia32_sys_write+0x71/0xb0 fs/read_write.c:607 do_syscall_32_irqs_on arch/x86/entry/common.c:326 [inline] do_fast_syscall_32+0x34d/0xfb2 arch/x86/entry/common.c:397 entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139 RIP: 0023:0xf7fb1cb9 Code: 55 08 8b 88 64 cd ff ff 8b 98 68 cd ff ff 89 c8 85 d2 74 02 89 0a 5b 5d c3 8b 04 24 c3 8b 1c 24 c3 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 eb 0d 90 90 90 90 90 90 90 90 90 90 90 90 RSP: 002b:00000000f5f6b0ac EFLAGS: 00000282 ORIG_RAX: 0000000000000004 RAX: ffffffffffffffda RBX: 0000000000000016 RCX: 00000000200000c0 RDX: 00000000ffffff7d RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 22874 Comm: syz-executor6 Not tainted 4.18.0-rc5+ #57 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:arch_local_save_flags arch/x86/include/asm/paravirt.h:778 [inline] RIP: 0010:trace_hardirqs_off_caller+0x1f1/0x2c0 kernel/locking/lockdep.c:2914 Code: b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 c4 00 00 00 48 83 3d 87 a0 93 07 00 0f 84 aa 00 00 00 9c 58 <0f> 1f 44 00 00 f6 c4 02 0f 84 df fe ff ff e8 8c ce fd 01 85 c0 74 RSP: 0018:ffff880196067528 EFLAGS: 00000086 RAX: 0000000000000086 RBX: ffff8801d9792080 RCX: 0000000000000000 RDX: 1ffffffff11e3614 RSI: 0000000000000000 RDI: ffffffff88f1b0a0 RBP: ffff880196067540 R08: fffffbfff12ea115 R09: fffffbfff12ea114 R10: fffffbfff12ea114 R11: ffffffff897508a3 R12: ffff8801d9792080 R13: ffffffff87929673 R14: 0000000000000000 R15: 0000000000000002 FS: 0000000000000000(0000) GS:ffff8801dae00000(0063) knlGS:00000000f5fadb40 CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 CR2: ffffffffff600400 CR3: 00000001c8c59000 CR4: 00000000001406f0 DR0: 0000000020000000 DR1: 0000000020000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: trace_hardirqs_off+0xd/0x10 kernel/locking/lockdep.c:2932 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline] _raw_spin_unlock_irqrestore+0x63/0xc0 kernel/locking/spinlock.c:184 spin_unlock_irqrestore include/linux/spinlock.h:365 [inline] queueptr+0x99/0xb0 sound/core/seq/seq_queue.c:237 update_timestamp_of_queue+0x25/0x220 sound/core/seq/seq_clientmgr.c:561 deliver_to_subscribers sound/core/seq/seq_clientmgr.c:675 [inline] snd_seq_deliver_event+0x57f/0x950 sound/core/seq/seq_clientmgr.c:812 snd_seq_kernel_client_dispatch+0x157/0x1a0 sound/core/seq/seq_clientmgr.c:2331 snd_virmidi_output_trigger+0x444/0x6b0 sound/core/seq/seq_virmidi.c:198 snd_rawmidi_output_trigger sound/core/rawmidi.c:150 [inline] snd_rawmidi_kernel_write1+0x519/0x700 sound/core/rawmidi.c:1288 snd_rawmidi_write+0x2ea/0xde0 sound/core/rawmidi.c:1338 __vfs_write+0x117/0x9f0 fs/read_write.c:485 vfs_write+0x1f8/0x560 fs/read_write.c:549 ksys_write+0x101/0x260 fs/read_write.c:598 __do_sys_write fs/read_write.c:610 [inline] __se_sys_write fs/read_write.c:607 [inline] __ia32_sys_write+0x71/0xb0 fs/read_write.c:607 do_syscall_32_irqs_on arch/x86/entry/common.c:326 [inline] do_fast_syscall_32+0x34d/0xfb2 arch/x86/entry/common.c:397 entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139 RIP: 0023:0xf7fb1cb9 Code: 55 08 8b 88 64 cd ff ff 8b 98 68 cd ff ff 89 c8 85 d2 74 02 89 0a 5b 5d c3 8b 04 24 c3 8b 1c 24 c3 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 eb 0d 90 90 90 90 90 90 90 90 90 90 90 90 RSP: 002b:00000000f5fad0ac EFLAGS: 00000282 ORIG_RAX: 0000000000000004 RAX: ffffffffffffffda RBX: 0000000000000014 RCX: 00000000200000c0 RDX: 00000000ffffff7d RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000