INFO: task syz.1.7721:21911 blocked in I/O wait for more than 143 seconds.
Tainted: G L syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.1.7721 state:D stack:25800 pid:21911 tgid:21906 ppid:19960 task_flags:0x400140 flags:0x08080002
Call Trace:
context_switch kernel/sched/core.c:5504 [inline]
__schedule+0x125c/0x6730 kernel/sched/core.c:7228
__schedule_loop kernel/sched/core.c:7307 [inline]
schedule+0xdd/0x390 kernel/sched/core.c:7322
io_schedule+0x8a/0xf0 kernel/sched/core.c:8150
folio_wait_bit_common+0x414/0xa70 mm/filemap.c:1324
folio_lock include/linux/pagemap.h:1159 [inline]
migrate_folio_unmap mm/migrate.c:1250 [inline]
migrate_pages_batch+0x7a1/0x45c0 mm/migrate.c:1907
migrate_pages_sync+0x4db/0x880 mm/migrate.c:2051
migrate_pages+0x1a83/0x2850 mm/migrate.c:2133
compact_zone+0x243c/0x4420 mm/compaction.c:2669
compact_node+0x17f/0x2c0 mm/compaction.c:2938
compact_nodes mm/compaction.c:2960 [inline]
sysctl_compaction_handler mm/compaction.c:3011 [inline]
sysctl_compaction_handler+0x141/0x210 mm/compaction.c:2998
proc_sys_call_handler+0x47f/0x5a0 fs/proc/proc_sysctl.c:600
iter_file_splice_write+0x830/0x10b0 fs/splice.c:736
do_splice_from fs/splice.c:936 [inline]
direct_splice_actor+0x192/0x690 fs/splice.c:1159
splice_direct_to_actor+0x345/0xa30 fs/splice.c:1103
do_splice_direct_actor fs/splice.c:1202 [inline]
do_splice_direct+0x174/0x240 fs/splice.c:1228
do_sendfile+0xadc/0xe20 fs/read_write.c:1371
__do_compat_sys_sendfile fs/read_write.c:1447 [inline]
__se_compat_sys_sendfile fs/read_write.c:1436 [inline]
__ia32_compat_sys_sendfile+0x162/0x220 fs/read_write.c:1436
do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline]
__do_fast_syscall_32+0xe7/0x970 arch/x86/entry/syscall_32.c:307
do_fast_syscall_32+0x32/0x70 arch/x86/entry/syscall_32.c:332
entry_SYSENTER_compat_after_hwframe+0x84/0x8e
RIP: 0023:0xf709efec
RSP: 002b:00000000f544b50c EFLAGS: 00000292 ORIG_RAX: 00000000000000bb
RAX: ffffffffffffffda RBX: 000000000000000b RCX: 0000000000000008
RDX: 00000000800000c0 RSI: 0000000000000005 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000292 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
INFO: lockdep is turned off.
NMI backtrace for cpu 3
CPU: 3 UID: 0 PID: 43 Comm: khungtaskd Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
Call Trace:
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120
nmi_cpu_backtrace.cold+0x12d/0x151 lib/nmi_backtrace.c:122
nmi_trigger_cpumask_backtrace+0x21c/0x2a0 lib/nmi_backtrace.c:65
trigger_all_cpu_backtrace include/linux/nmi.h:162 [inline]
__sys_info lib/sys_info.c:157 [inline]
sys_info+0x141/0x190 lib/sys_info.c:165
check_hung_uninterruptible_tasks kernel/hung_task.c:353 [inline]
watchdog+0xcb1/0x1030 kernel/hung_task.c:561
kthread+0x370/0x450 kernel/kthread.c:436
ret_from_fork+0x72b/0xd50 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Sending NMI from CPU 3 to CPUs 0-2:
NMI backtrace for cpu 2
CPU: 2 UID: 0 PID: 0 Comm: swapper/2 Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
RIP: 0010:pv_native_safe_halt+0xf/0x20 arch/x86/kernel/paravirt.c:64
Code: 76 88 02 c3 cc cc cc cc 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa eb 07 0f 00 2d 83 76 13 00 fb f4 fc 48 03 00 66 2e 0f 1f 84 00 00 00 00 00 66 90 90 90 90 90 90
RSP: 0018:ffffc9000047fe00 EFLAGS: 00000246
RAX: 0000000001c6204c RBX: ffff88801c7e4a80 RCX: ffffffff8b9822d5
RDX: 0000000000000001 RSI: ffffffff8c1e6500 RDI: ffffffff81ddc3a7
RBP: ffffed10038fc950 R08: 0000000000000000 R09: ffffed100568678d
R10: ffff88802b433c6b R11: ffffffff81d4986c R12: 0000000000000000
R13: 0000000000000000 R14: 1ffff9200008ffc4 R15: dffffc0000000000
FS: 0000000000000000(0000) GS:ffff8880972f6000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000558a53f34000 CR3: 000000004e2d7000 CR4: 0000000000352ef0
DR0: 0000000000000009 DR1: 00000000000000c9 DR2: 00000000000000f3
DR3: 00000000000000c0 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
arch_safe_halt arch/x86/include/asm/paravirt.h:62 [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:199 [inline]
do_idle+0x3a7/0x5b0 kernel/sched/idle.c:355
cpu_startup_entry+0x4f/0x60 kernel/sched/idle.c:454
start_secondary+0x21d/0x2d0 arch/x86/kernel/smpboot.c:312
common_startup_64+0x13e/0x158
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 29572 Comm: syz.7.8719 Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
RIP: 0010:check_preemption_disabled+0x1c/0xe0 lib/smp_processor_id.c:54
Code: 90 90 90 90 90 90 90 90 90 90 90 90 90 90 41 54 55 53 48 83 ec 08 65 8b 1d d5 75 7a 08 65 f7 05 c6 75 7a 08 ff ff ff 7f 74 0f <48> 83 c4 08 89 d8 5b 5d 41 5c c3 cc cc cc cc 9c 58 f6 c4 02 74 ea
RSP: 0000:ffffc900070af5c0 EFLAGS: 00000006
RAX: dffffc0000000000 RBX: 0000000000000001 RCX: 0000000000000002
RDX: 0000000000000098 RSI: ffffffff8c1e6500 RDI: ffffffff8c1e6540
RBP: 0000000000000002 R08: ffff888044faca94 R09: fffffbfff21b6e8f
R10: ffffffff90db747f R11: 0000000000000001 R12: 0000000000000098
R13: ffff8880972f6000 R14: ffff888044fad4f8 R15: ffff888044faca80
FS: 0000000000000000(0000) GS:ffff8880971f6000(0063) knlGS:00000000f5415b40
CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 00000000803ce000 CR3: 000000004e2d7000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
ttwu_queue_cond kernel/sched/core.c:4007 [inline]
ttwu_queue_wakelist+0x20/0x450 kernel/sched/core.c:4058
ttwu_queue kernel/sched/core.c:4072 [inline]
try_to_wake_up+0xbca/0x1c90 kernel/sched/core.c:4415
autoremove_wake_function+0x16/0x150 kernel/sched/wait.c:403
__wake_up_common+0x135/0x1f0 kernel/sched/wait.c:108
__wake_up_common_lock kernel/sched/wait.c:125 [inline]
__wake_up_sync_key+0x36/0x50 kernel/sched/wait.c:192
__unix_dgram_recvmsg+0x31a/0xc30 net/unix/af_unix.c:2607
unix_dgram_recvmsg+0xcd/0x100 net/unix/af_unix.c:2681
sock_recvmsg_nosec net/socket.c:1126 [inline]
____sys_recvmsg+0x5eb/0x670 net/socket.c:2902
___sys_recvmsg+0x16a/0x1a0 net/socket.c:2946
do_recvmmsg+0x54d/0x740 net/socket.c:3033
__sys_recvmmsg+0x21f/0x270 net/socket.c:3115
__do_compat_sys_recvmmsg_time32 net/compat.c:417 [inline]
__se_compat_sys_recvmmsg_time32 net/compat.c:413 [inline]
__ia32_compat_sys_recvmmsg_time32+0xc4/0x160 net/compat.c:413
do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline]
__do_fast_syscall_32+0xe7/0x970 arch/x86/entry/syscall_32.c:307
do_fast_syscall_32+0x32/0x70 arch/x86/entry/syscall_32.c:332
entry_SYSENTER_compat_after_hwframe+0x84/0x8e
RIP: 0023:0xf7f75fec
Code: Unable to access opcode bytes at 0xf7f75fc2.
RSP: 002b:00000000f541550c EFLAGS: 00000292 ORIG_RAX: 0000000000000151
RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 0000000080000040
RDX: 00000000080002c1 RSI: 0000000000000002 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000292 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 15612 Comm: kworker/0:0H Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
Workqueue: events_highpri snd_vmidi_output_work
RIP: 0010:pv_wait_head_or_lock kernel/locking/qspinlock_paravirt.h:430 [inline]
RIP: 0010:__pv_queued_spin_lock_slowpath+0x434/0xc00 kernel/locking/qspinlock.c:325
Code: 01 00 00 66 89 8c 24 80 00 00 00 41 0f b6 45 00 44 38 f8 7f 08 84 c0 0f 85 c8 06 00 00 0f b6 03 84 c0 0f 84 84 00 00 00 f3 90 <41> 83 ec 01 75 ce 48 b8 00 00 00 00 00 fc ff df 48 8b 74 24 20 48
RSP: 0000:ffffc9000656f780 EFLAGS: 00000002
RAX: 0000000000000001 RBX: ffff88802b23b4c8 RCX: 0000000000000100
RDX: 0000000000000001 RSI: 0000000000000002 RDI: ffff88802b23b4ca
RBP: dffffc0000000000 R08: 0000000000000001 R09: ffffed1005647699
R10: ffff88802b23b4cb R11: 0000000000000000 R12: 0000000000007f90
R13: ffffed1005647699 R14: ffff88802b23c480 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff8880970f6000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000f7248850 CR3: 0000000050e86000 CR4: 0000000000352ef0
Call Trace:
pv_queued_spin_lock_slowpath arch/x86/include/asm/paravirt-spinlock.h:35 [inline]
queued_spin_lock_slowpath arch/x86/include/asm/paravirt-spinlock.h:66 [inline]
queued_spin_lock include/asm-generic/qspinlock.h:114 [inline]
do_raw_spin_lock+0x1e0/0x260 kernel/locking/spinlock_debug.c:116
raw_spin_rq_lock_nested kernel/sched/core.c:675 [inline]
raw_spin_rq_lock_nested+0x88/0x140 kernel/sched/core.c:659
raw_spin_rq_lock kernel/sched/sched.h:1653 [inline]
rq_lock kernel/sched/sched.h:1991 [inline]
ttwu_queue kernel/sched/core.c:4075 [inline]
try_to_wake_up+0xbf1/0x1c90 kernel/sched/core.c:4415
__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
__snd_rawmidi_transmit_ack+0x225/0x380 sound/core/rawmidi.c:1448
snd_rawmidi_transmit+0xdf/0x130 sound/core/rawmidi.c:1492
snd_vmidi_output_work+0x111/0x390 sound/core/seq/seq_virmidi.c:151
process_one_work+0xa23/0x1940 kernel/workqueue.c:3322
process_scheduled_works kernel/workqueue.c:3405 [inline]
worker_thread+0x5ef/0xe50 kernel/workqueue.c:3486
kthread+0x370/0x450 kernel/kthread.c:436
ret_from_fork+0x72b/0xd50 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245