------------[ cut here ]------------
======================================================
WARNING: possible circular locking dependency detected
syzkaller #0 Tainted: G L
------------------------------------------------------
syz.6.4520/27996 is trying to acquire lock:
ffffffff8e6f3680 (console_owner){-.-.}-{0:0}, at: console_lock_spinning_enable+0x61/0x80 kernel/printk/printk.c:1902
but task is already holding lock:
ffff8880b843b2e0 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested kernel/sched/core.c:655 [inline]
ffff8880b843b2e0 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x88/0x140 kernel/sched/core.c:639
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #4 (&rq->__lock){-.-.}-{2:2}:
_raw_spin_lock_nested+0x31/0x40 kernel/locking/spinlock.c:378
raw_spin_rq_lock_nested+0x2c/0x140 kernel/sched/core.c:647
raw_spin_rq_lock kernel/sched/sched.h:1615 [inline]
_task_rq_lock+0xcf/0x490 kernel/sched/core.c:747
cgroup_move_task+0x81/0x2b0 kernel/sched/psi.c:1170
css_set_move_task+0x285/0x600 kernel/cgroup/cgroup.c:948
cgroup_post_fork+0x202/0x9b0 kernel/cgroup/cgroup.c:6917
copy_process+0x5717/0x7a40 kernel/fork.c:2467
kernel_clone+0xfc/0x9a0 kernel/fork.c:2653
user_mode_thread+0xcc/0x110 kernel/fork.c:2729
rest_init+0x21/0x260 init/main.c:725
start_kernel+0x47f/0x480 init/main.c:1210
x86_64_start_reservations+0x24/0x30 arch/x86/kernel/head64.c:310
x86_64_start_kernel+0x12b/0x130 arch/x86/kernel/head64.c:291
common_startup_64+0x13e/0x148
-> #3 (&p->pi_lock){-.-.}-{2:2}:
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:132 [inline]
_raw_spin_lock_irqsave+0x3a/0x60 kernel/locking/spinlock.c:162
class_raw_spinlock_irqsave_constructor include/linux/spinlock.h:570 [inline]
try_to_wake_up+0xb2/0x1a80 kernel/sched/core.c:4130
__wake_up_common+0x135/0x1f0 kernel/sched/wait.c:108
__wake_up_common_lock kernel/sched/wait.c:125 [inline]
__wake_up+0x31/0x60 kernel/sched/wait.c:146
tty_port_default_wakeup+0x47/0x60 drivers/tty/tty_port.c:67
serial8250_tx_chars+0x68f/0x860 drivers/tty/serial/8250/8250_port.c:1719
serial8250_handle_irq+0x73e/0xcb0 drivers/tty/serial/8250/8250_port.c:1827
serial8250_default_handle_irq+0x9e/0x270 drivers/tty/serial/8250/8250_port.c:1846
serial8250_interrupt+0xf8/0x1d0 drivers/tty/serial/8250/8250_core.c:86
__handle_irq_event_percpu+0x232/0x8e0 kernel/irq/handle.c:209
handle_irq_event_percpu kernel/irq/handle.c:246 [inline]
handle_irq_event+0xab/0x1e0 kernel/irq/handle.c:263
handle_edge_irq+0x375/0x970 kernel/irq/chip.c:855
generic_handle_irq_desc include/linux/irqdesc.h:186 [inline]
handle_irq arch/x86/kernel/irq.c:262 [inline]
call_irq_handler arch/x86/kernel/irq.c:318 [inline]
__common_interrupt+0xd8/0x2f0 arch/x86/kernel/irq.c:333
common_interrupt+0xb9/0xe0 arch/x86/kernel/irq.c:326
asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:688
native_safe_halt arch/x86/include/asm/irqflags.h:48 [inline]
pv_native_safe_halt+0xf/0x20 arch/x86/kernel/paravirt.c:62
arch_safe_halt arch/x86/include/asm/paravirt.h:73 [inline]
default_idle+0x9/0x10 arch/x86/kernel/process.c:767
default_idle_call+0x6c/0xb0 kernel/sched/idle.c:122
cpuidle_idle_call kernel/sched/idle.c:191 [inline]
do_idle+0x43a/0x550 kernel/sched/idle.c:341
cpu_startup_entry+0x4f/0x60 kernel/sched/idle.c:439
rest_init+0x251/0x260 init/main.c:760
start_kernel+0x47f/0x480 init/main.c:1210
x86_64_start_reservations+0x24/0x30 arch/x86/kernel/head64.c:310
x86_64_start_kernel+0x12b/0x130 arch/x86/kernel/head64.c:291
common_startup_64+0x13e/0x148
-> #2 (&tty->write_wait){-.-.}-{3:3}:
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:132 [inline]
_raw_spin_lock_irqsave+0x3a/0x60 kernel/locking/spinlock.c:162
__wake_up_common_lock kernel/sched/wait.c:124 [inline]
__wake_up+0x1c/0x60 kernel/sched/wait.c:146
tty_port_default_wakeup+0x47/0x60 drivers/tty/tty_port.c:67
serial8250_tx_chars+0x68f/0x860 drivers/tty/serial/8250/8250_port.c:1719
serial8250_handle_irq+0x73e/0xcb0 drivers/tty/serial/8250/8250_port.c:1827
serial8250_default_handle_irq+0x9e/0x270 drivers/tty/serial/8250/8250_port.c:1846
serial8250_interrupt+0xf8/0x1d0 drivers/tty/serial/8250/8250_core.c:86
__handle_irq_event_percpu+0x232/0x8e0 kernel/irq/handle.c:209
handle_irq_event_percpu kernel/irq/handle.c:246 [inline]
handle_irq_event+0xab/0x1e0 kernel/irq/handle.c:263
handle_edge_irq+0x375/0x970 kernel/irq/chip.c:855
generic_handle_irq_desc include/linux/irqdesc.h:186 [inline]
handle_irq arch/x86/kernel/irq.c:262 [inline]
call_irq_handler arch/x86/kernel/irq.c:318 [inline]
__common_interrupt+0xd8/0x2f0 arch/x86/kernel/irq.c:333
common_interrupt+0xb9/0xe0 arch/x86/kernel/irq.c:326
asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:688
__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:178 [inline]
_raw_spin_unlock_irqrestore+0x31/0x80 kernel/locking/spinlock.c:194
spin_unlock_irqrestore include/linux/spinlock.h:407 [inline]
uart_port_unlock_irqrestore include/linux/serial_core.h:788 [inline]
uart_port_unlock_deref drivers/tty/serial/serial_core.c:91 [inline]
uart_port_unlock_deref drivers/tty/serial/serial_core.c:88 [inline]
uart_write+0x29d/0xb20 drivers/tty/serial/serial_core.c:634
process_output_block drivers/tty/n_tty.c:557 [inline]
n_tty_write+0x44f/0x12d0 drivers/tty/n_tty.c:2366
iterate_tty_write drivers/tty/tty_io.c:1006 [inline]
file_tty_write.isra.0+0x4d2/0x890 drivers/tty/tty_io.c:1081
tty_write drivers/tty/tty_io.c:1102 [inline]
redirected_tty_write drivers/tty/tty_io.c:1125 [inline]
redirected_tty_write+0xd4/0x120 drivers/tty/tty_io.c:1105
new_sync_write fs/read_write.c:595 [inline]
vfs_write+0x6ac/0x1070 fs/read_write.c:688
ksys_write+0x12a/0x250 fs/read_write.c:740
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x106/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
-> #1 (&port_lock_key){-.-.}-{3:3}:
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:132 [inline]
_raw_spin_lock_irqsave+0x3a/0x60 kernel/locking/spinlock.c:162
uart_port_lock_irqsave include/linux/serial_core.h:717 [inline]
serial8250_console_write+0x17e/0x1900 drivers/tty/serial/8250/8250_port.c:3301
console_emit_next_record kernel/printk/printk.c:3183 [inline]
console_flush_one_record+0x790/0xe50 kernel/printk/printk.c:3269
console_flush_all kernel/printk/printk.c:3343 [inline]
__console_flush_and_unlock kernel/printk/printk.c:3373 [inline]
console_unlock+0x103/0x260 kernel/printk/printk.c:3413
vprintk_emit+0x407/0x6b0 kernel/printk/printk.c:2479
_printk+0xcf/0x110 kernel/printk/printk.c:2504
register_console.cold+0xc0/0x248 kernel/printk/printk.c:4208
univ8250_console_init+0x6f/0x80 drivers/tty/serial/8250/8250_core.c:515
console_init+0x423/0x620 kernel/printk/printk.c:4407
start_kernel+0x305/0x480 init/main.c:1147
x86_64_start_reservations+0x24/0x30 arch/x86/kernel/head64.c:310
x86_64_start_kernel+0x12b/0x130 arch/x86/kernel/head64.c:291
common_startup_64+0x13e/0x148
-> #0 (console_owner){-.-.}-{0:0}:
check_prev_add kernel/locking/lockdep.c:3165 [inline]
check_prevs_add kernel/locking/lockdep.c:3284 [inline]
validate_chain kernel/locking/lockdep.c:3908 [inline]
__lock_acquire+0x14b8/0x2630 kernel/locking/lockdep.c:5237
lock_acquire kernel/locking/lockdep.c:5868 [inline]
lock_acquire+0x1cf/0x380 kernel/locking/lockdep.c:5825
console_lock_spinning_enable+0x72/0x80 kernel/printk/printk.c:1902
console_emit_next_record kernel/printk/printk.c:3177 [inline]
console_flush_one_record+0x739/0xe50 kernel/printk/printk.c:3269
console_flush_all kernel/printk/printk.c:3343 [inline]
__console_flush_and_unlock kernel/printk/printk.c:3373 [inline]
console_unlock+0x103/0x260 kernel/printk/printk.c:3413
vprintk_emit+0x407/0x6b0 kernel/printk/printk.c:2479
_printk+0xcf/0x110 kernel/printk/printk.c:2504
__report_bug.cold+0x15/0x137 lib/bug.c:243
report_bug+0xb2/0x220 lib/bug.c:281
handle_bug+0x16a/0x2a0 arch/x86/kernel/traps.c:435
exc_invalid_op+0x17/0x50 arch/x86/kernel/traps.c:489
asm_exc_invalid_op+0x1a/0x20 arch/x86/include/asm/idtentry.h:616
lockdep_assert_rq_held kernel/sched/sched.h:1600 [inline]
lockdep_assert_rq_held kernel/sched/sched.h:1597 [inline]
update_rq_clock+0x40a/0xd20 kernel/sched/core.c:850
pick_next_task kernel/sched/core.c:6132 [inline]
__schedule+0x1b7d/0x6120 kernel/sched/core.c:6852
preempt_schedule_irq+0x50/0x90 kernel/sched/core.c:7238
irqentry_exit+0x17b/0x670 kernel/entry/common.c:239
asm_sysvec_reschedule_ipi+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
__sanitizer_cov_trace_pc+0x0/0x70 include/linux/refcount.h:400
queue_work_on+0x141/0x1e0 kernel/workqueue.c:2410
queue_work include/linux/workqueue.h:669 [inline]
snd_virmidi_output_trigger+0xf6/0x140 sound/core/seq/seq_virmidi.c:178
snd_rawmidi_output_trigger sound/core/rawmidi.c:213 [inline]
snd_rawmidi_output_trigger sound/core/rawmidi.c:209 [inline]
snd_rawmidi_kernel_write1+0x51f/0x7c0 sound/core/rawmidi.c:1576
snd_rawmidi_write+0x2dc/0xc60 sound/core/rawmidi.c:1629
vfs_write+0x2aa/0x1070 fs/read_write.c:686
ksys_write+0x1f8/0x250 fs/read_write.c:740
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x106/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
other info that might help us debug this:
Chain exists of:
console_owner --> &p->pi_lock --> &rq->__lock
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(&rq->__lock);
lock(&p->pi_lock);
lock(&rq->__lock);
lock(console_owner);
*** DEADLOCK ***
3 locks held by syz.6.4520/27996:
#0: ffff8880b843b2e0 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested kernel/sched/core.c:655 [inline]
#0: ffff8880b843b2e0 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x88/0x140 kernel/sched/core.c:639
#1: ffffffff8e7d3ac0 (console_lock){+.+.}-{0:0}, at: _printk+0xcf/0x110 kernel/printk/printk.c:2504
#2: ffffffff8e7d3b38 (console_srcu){....}-{0:0}, at: rcu_try_lock_acquire include/linux/rcupdate.h:317 [inline]
#2: ffffffff8e7d3b38 (console_srcu){....}-{0:0}, at: srcu_read_lock_nmisafe include/linux/srcu.h:428 [inline]
#2: ffffffff8e7d3b38 (console_srcu){....}-{0:0}, at: console_srcu_read_lock kernel/printk/printk.c:291 [inline]
#2: ffffffff8e7d3b38 (console_srcu){....}-{0:0}, at: console_flush_one_record+0xfd/0xe50 kernel/printk/printk.c:3246
stack backtrace:
CPU: 0 UID: 0 PID: 27996 Comm: syz.6.4520 Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
Call Trace:
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120
print_circular_bug.cold+0x178/0x1c7 kernel/locking/lockdep.c:2043
check_noncircular+0x146/0x160 kernel/locking/lockdep.c:2175
check_prev_add kernel/locking/lockdep.c:3165 [inline]
check_prevs_add kernel/locking/lockdep.c:3284 [inline]
validate_chain kernel/locking/lockdep.c:3908 [inline]
__lock_acquire+0x14b8/0x2630 kernel/locking/lockdep.c:5237
lock_acquire kernel/locking/lockdep.c:5868 [inline]
lock_acquire+0x1cf/0x380 kernel/locking/lockdep.c:5825
console_lock_spinning_enable+0x72/0x80 kernel/printk/printk.c:1902
console_emit_next_record kernel/printk/printk.c:3177 [inline]
console_flush_one_record+0x739/0xe50 kernel/printk/printk.c:3269
console_flush_all kernel/printk/printk.c:3343 [inline]
__console_flush_and_unlock kernel/printk/printk.c:3373 [inline]
console_unlock+0x103/0x260 kernel/printk/printk.c:3413
vprintk_emit+0x407/0x6b0 kernel/printk/printk.c:2479
_printk+0xcf/0x110 kernel/printk/printk.c:2504
__report_bug.cold+0x15/0x137 lib/bug.c:243
report_bug+0xb2/0x220 lib/bug.c:281
handle_bug+0x16a/0x2a0 arch/x86/kernel/traps.c:435
exc_invalid_op+0x17/0x50 arch/x86/kernel/traps.c:489
asm_exc_invalid_op+0x1a/0x20 arch/x86/include/asm/idtentry.h:616
RIP: 0010:lockdep_assert_rq_held kernel/sched/sched.h:1600 [inline]
RIP: 0010:lockdep_assert_rq_held kernel/sched/sched.h:1597 [inline]
RIP: 0010:update_rq_clock+0x40a/0xd20 kernel/sched/core.c:850
Code: ab 48 0b 00 00 48 83 c4 18 5b 5d 41 5c 41 5d 41 5e 41 5f c3 cc cc cc cc a8 04 0f 84 df fc ff ff 90 0f 0b 90 e9 d6 fc ff ff 90 <0f> 0b 90 e9 92 fc ff ff 4c 8d 83 40 0b 00 00 48 b8 00 00 00 00 00
RSP: 0018:ffffc9000636f820 EFLAGS: 00010046
RAX: 0000000000000000 RBX: ffff8880b853b280 RCX: 0000000000000001
RDX: 0000000000000046 RSI: ffffffff8de59aee RDI: ffffffff8c1b09a0
RBP: ffffc9000636f9c8 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff90d9c017 R11: 0000000000000000 R12: ffffffff90d9f3e4
R13: ffff8880b853c0c0 R14: ffff88801e691e80 R15: ffff8880b853b280
pick_next_task kernel/sched/core.c:6132 [inline]
__schedule+0x1b7d/0x6120 kernel/sched/core.c:6852
preempt_schedule_irq+0x50/0x90 kernel/sched/core.c:7238
irqentry_exit+0x17b/0x670 kernel/entry/common.c:239
asm_sysvec_reschedule_ipi+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x70 kernel/kcov.c:210
Code: 96 09 5a 00 48 89 df 5b e9 7d 83 5f 00 be 03 00 00 00 5b e9 62 e5 eb 02 66 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1e fa 65 8b 05 c5 47 05 12 48 8b 34 24 65 48 8b 15 a1 47 05
RSP: 0018:ffffc9000636fad8 EFLAGS: 00000283
RAX: 0000000000030043 RBX: 0000000000000000 RCX: ffffc900118bf000
RDX: 0000000000080000 RSI: ffffffff81cf5ddb RDI: ffff888027b85b80
RBP: 0000000000000001 R08: 0000000000000007 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000008
R13: ffff88813fe62c00 R14: ffff8880336ed900 R15: 0000000000001000
queue_work_on+0x141/0x1e0 kernel/workqueue.c:2410
queue_work include/linux/workqueue.h:669 [inline]
snd_virmidi_output_trigger+0xf6/0x140 sound/core/seq/seq_virmidi.c:178
snd_rawmidi_output_trigger sound/core/rawmidi.c:213 [inline]
snd_rawmidi_output_trigger sound/core/rawmidi.c:209 [inline]
snd_rawmidi_kernel_write1+0x51f/0x7c0 sound/core/rawmidi.c:1576
snd_rawmidi_write+0x2dc/0xc60 sound/core/rawmidi.c:1629
vfs_write+0x2aa/0x1070 fs/read_write.c:686
ksys_write+0x1f8/0x250 fs/read_write.c:740
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x106/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f328419c799
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f32850e2028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f3284416090 RCX: 00007f328419c799
RDX: 000000100000a3d9 RSI: 0000200000000400 RDI: 0000000000000008
RBP: 00007f3284232c99 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f3284416128 R14: 00007f3284416090 R15: 00007ffd1a73d978
debug_locks && !(lock_is_held(&(__rq_lockp(rq))->dep_map) != 0)
WARNING: kernel/sched/sched.h:1600 at lockdep_assert_rq_held kernel/sched/sched.h:1600 [inline], CPU#0: syz.6.4520/27996
WARNING: kernel/sched/sched.h:1600 at lockdep_assert_rq_held kernel/sched/sched.h:1597 [inline], CPU#0: syz.6.4520/27996
WARNING: kernel/sched/sched.h:1600 at update_rq_clock+0x40a/0xd20 kernel/sched/core.c:850, CPU#0: syz.6.4520/27996
Modules linked in:
CPU: 0 UID: 0 PID: 27996 Comm: syz.6.4520 Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
RIP: 0010:lockdep_assert_rq_held kernel/sched/sched.h:1600 [inline]
RIP: 0010:lockdep_assert_rq_held kernel/sched/sched.h:1597 [inline]
RIP: 0010:update_rq_clock+0x40a/0xd20 kernel/sched/core.c:850
Code: ab 48 0b 00 00 48 83 c4 18 5b 5d 41 5c 41 5d 41 5e 41 5f c3 cc cc cc cc a8 04 0f 84 df fc ff ff 90 0f 0b 90 e9 d6 fc ff ff 90 <0f> 0b 90 e9 92 fc ff ff 4c 8d 83 40 0b 00 00 48 b8 00 00 00 00 00
RSP: 0018:ffffc9000636f820 EFLAGS: 00010046
RAX: 0000000000000000 RBX: ffff8880b853b280 RCX: 0000000000000001
RDX: 0000000000000046 RSI: ffffffff8de59aee RDI: ffffffff8c1b09a0
RBP: ffffc9000636f9c8 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff90d9c017 R11: 0000000000000000 R12: ffffffff90d9f3e4
R13: ffff8880b853c0c0 R14: ffff88801e691e80 R15: ffff8880b853b280
FS: 00007f32850e26c0(0000) GS:ffff88812434a000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2ea12ff8 CR3: 0000000035e1e000 CR4: 00000000003526f0
Call Trace:
pick_next_task kernel/sched/core.c:6132 [inline]
__schedule+0x1b7d/0x6120 kernel/sched/core.c:6852
preempt_schedule_irq+0x50/0x90 kernel/sched/core.c:7238
irqentry_exit+0x17b/0x670 kernel/entry/common.c:239
asm_sysvec_reschedule_ipi+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x70 kernel/kcov.c:210
Code: 96 09 5a 00 48 89 df 5b e9 7d 83 5f 00 be 03 00 00 00 5b e9 62 e5 eb 02 66 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1e fa 65 8b 05 c5 47 05 12 48 8b 34 24 65 48 8b 15 a1 47 05
RSP: 0018:ffffc9000636fad8 EFLAGS: 00000283
RAX: 0000000000030043 RBX: 0000000000000000 RCX: ffffc900118bf000
RDX: 0000000000080000 RSI: ffffffff81cf5ddb RDI: ffff888027b85b80
RBP: 0000000000000001 R08: 0000000000000007 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000008
R13: ffff88813fe62c00 R14: ffff8880336ed900 R15: 0000000000001000
queue_work_on+0x141/0x1e0 kernel/workqueue.c:2410
queue_work include/linux/workqueue.h:669 [inline]
snd_virmidi_output_trigger+0xf6/0x140 sound/core/seq/seq_virmidi.c:178
snd_rawmidi_output_trigger sound/core/rawmidi.c:213 [inline]
snd_rawmidi_output_trigger sound/core/rawmidi.c:209 [inline]
snd_rawmidi_kernel_write1+0x51f/0x7c0 sound/core/rawmidi.c:1576
snd_rawmidi_write+0x2dc/0xc60 sound/core/rawmidi.c:1629
vfs_write+0x2aa/0x1070 fs/read_write.c:686
ksys_write+0x1f8/0x250 fs/read_write.c:740
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x106/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f328419c799
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f32850e2028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f3284416090 RCX: 00007f328419c799
RDX: 000000100000a3d9 RSI: 0000200000000400 RDI: 0000000000000008
RBP: 00007f3284232c99 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f3284416128 R14: 00007f3284416090 R15: 00007ffd1a73d978
----------------
Code disassembly (best guess):
0: 96 xchg %eax,%esi
1: 09 5a 00 or %ebx,0x0(%rdx)
4: 48 89 df mov %rbx,%rdi
7: 5b pop %rbx
8: e9 7d 83 5f 00 jmp 0x5f838a
d: be 03 00 00 00 mov $0x3,%esi
12: 5b pop %rbx
13: e9 62 e5 eb 02 jmp 0x2ebe57a
18: 66 90 xchg %ax,%ax
1a: 90 nop
1b: 90 nop
1c: 90 nop
1d: 90 nop
1e: 90 nop
1f: 90 nop
20: 90 nop
21: 90 nop
22: 90 nop
23: 90 nop
24: 90 nop
25: 90 nop
26: 90 nop
27: 90 nop
28: 90 nop
29: 90 nop
* 2a: f3 0f 1e fa endbr64 <-- trapping instruction
2e: 65 8b 05 c5 47 05 12 mov %gs:0x120547c5(%rip),%eax # 0x120547fa
35: 48 8b 34 24 mov (%rsp),%rsi
39: 65 gs
3a: 48 rex.W
3b: 8b .byte 0x8b
3c: 15 .byte 0x15
3d: a1 .byte 0xa1
3e: 47 rex.RXB
3f: 05 .byte 0x5