INFO: task syz.7.7926:3920 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.7.7926 state:D stack:25712 pid:3920 tgid:3919 ppid:1142 task_flags:0x400140 flags:0x08080002
Call Trace:
context_switch kernel/sched/core.c:5510 [inline]
__schedule+0x125c/0x6730 kernel/sched/core.c:7234
__schedule_loop kernel/sched/core.c:7311 [inline]
schedule+0xdd/0x2c0 kernel/sched/core.c:7326
io_schedule+0x8a/0xf0 kernel/sched/core.c:8154
folio_wait_bit_common+0x414/0xa70 mm/filemap.c:1323
folio_lock include/linux/pagemap.h:1157 [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:2668
compact_node+0x17f/0x2c0 mm/compaction.c:2937
compact_nodes mm/compaction.c:2959 [inline]
sysctl_compaction_handler mm/compaction.c:3010 [inline]
sysctl_compaction_handler+0x141/0x210 mm/compaction.c:2997
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: 0023:0xf700efec
RSP: 002b:00000000f53fd50c EFLAGS: 00000292 ORIG_RAX: 00000000000000bb
RAX: ffffffffffffffda RBX: 0000000000000009 RCX: 0000000000000008
RDX: 00000000800000c0 RSI: 0000000000000005 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
Showing all locks held in the system:
1 lock held by khungtaskd/43:
#0: ffffffff8ebe5f80 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:300 [inline]
#0: ffffffff8ebe5f80 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:840 [inline]
#0: ffffffff8ebe5f80 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x3d/0x184 kernel/locking/lockdep.c:6775
1 lock held by kswapd1/111:
2 locks held by udevd/5152:
2 locks held by getty/5541:
#0: ffff8880297040a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x24/0x80 drivers/tty/tty_ldisc.c:243
#1: ffffc9000019b2e8 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x419/0x14e0 drivers/tty/n_tty.c:2211
6 locks held by kworker/0:0H/14840:
3 locks held by syz-executor/28799:
1 lock held by udevd/2601:
#0: ffff88802571a350 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0x41a/0xe40 block/bdev.c:948
1 lock held by syz.7.7926/3920:
#0: ffff888025bb6450 (sb_writers#3){.+.+}-{0:0}, at: splice_direct_to_actor+0x345/0xa30 fs/splice.c:1103
4 locks held by syz.2.8533/7047:
2 locks held by syz.8.8543/7078:
1 lock held by syz.8.8543/7079:
#0: ffff8880466c4378 (&mm->mmap_lock){++++}-{4:4}, at: mmap_read_trylock include/linux/mmap_lock.h:611 [inline]
#0: ffff8880466c4378 (&mm->mmap_lock){++++}-{4:4}, at: get_mmap_lock_carefully mm/mmap_lock.c:441 [inline]
#0: ffff8880466c4378 (&mm->mmap_lock){++++}-{4:4}, at: lock_mm_and_find_vma+0x35/0x6f0 mm/mmap_lock.c:501
2 locks held by syz.3.8544/7081:
#0: ffff88802b23b660 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested kernel/sched/core.c:675 [inline]
#0: ffff88802b23b660 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x88/0x140 kernel/sched/core.c:659
#1: ffffffff9b93c378 (&obj_hash[i].lock){-.-.}-{2:2}, at: psi_sched_switch kernel/sched/stats.h:218 [inline]
#1: ffffffff9b93c378 (&obj_hash[i].lock){-.-.}-{2:2}, at: __schedule+0x2e8e/0x6730 kernel/sched/core.c:7228
2 locks held by syz.3.8544/7082:
3 locks held by syz.6.8546/7092:
=============================================
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: 111 Comm: kswapd1 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:__sanitizer_cov_trace_pc+0x3f/0x70 kernel/kcov.c:217
Code: 59 12 a9 00 01 ff 00 74 1b f6 c4 01 74 07 a9 00 00 ff 00 74 05 c3 cc cc cc cc 8b 82 24 17 00 00 85 c0 74 f1 8b 82 f8 16 00 00 <83> f8 02 75 e6 48 8b 8a 00 17 00 00 8b 92 fc 16 00 00 48 8b 01 48
RSP: 0000:ffffc9000214ecd8 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffff8880532d58c0 RCX: ffffffff8283cd86
RDX: ffff888041340000 RSI: ffffffff8283bd19 RDI: ffff88804b6b6800
RBP: ffff8880532d58c0 R08: 0000000000000004 R09: 0000000000000003
R10: 0000000000000005 R11: 0000000000000000 R12: 0000000000000005
R13: ffff88804b6b6800 R14: ffff8880532d58c0 R15: 0000000000012800
FS: 0000000000000000(0000) GS:ffff888096dee000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000f739a108 CR3: 000000005ceed000 CR4: 0000000000352ef0
Call Trace:
remove_zspage+0x19/0x2b0 mm/zsmalloc.c:665
fix_fullness_group+0x122/0x370 mm/zsmalloc.c:690
zs_malloc+0x894/0x1380 mm/zsmalloc.c:1324
zswap_compress mm/zswap.c:900 [inline]
zswap_store_page mm/zswap.c:1410 [inline]
zswap_store+0x12fa/0x2e70 mm/zswap.c:1521
swap_writeout+0xde0/0x1b20 mm/page_io.c:285
shmem_writeout+0xf14/0x1a90 mm/shmem.c:1703
pageout mm/vmscan.c:655 [inline]
shrink_folio_list+0x3bbd/0x60a0 mm/vmscan.c:1397
evict_folios+0x327/0x1960 mm/vmscan.c:4835
try_to_shrink_lruvec+0x249/0x6b0 mm/vmscan.c:4983
shrink_one+0x307/0x850 mm/vmscan.c:5024
shrink_many mm/vmscan.c:5087 [inline]
lru_gen_shrink_node mm/vmscan.c:5165 [inline]
shrink_node+0x2721/0x3e90 mm/vmscan.c:6154
kswapd_shrink_node mm/vmscan.c:7008 [inline]
balance_pgdat+0xb20/0x1f00 mm/vmscan.c:7186
kswapd+0x556/0xb50 mm/vmscan.c:7462
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
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 5152 Comm: udevd 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:asm_sysvec_apic_timer_interrupt+0x0/0x20 arch/x86/include/asm/idtentry.h:674
Code: 16 11 b7 0a e9 81 06 00 00 90 f3 0f 1e fa 0f 01 ca fc 6a ff e8 31 05 00 00 48 89 c4 48 89 e7 e8 26 10 b7 0a e9 61 06 00 00 90 0f 1e fa 0f 01 ca fc 6a ff e8 11 05 00 00 48 89 c4 48 89 e7 e8
RSP: 0018:ffffc900254f7ca8 EFLAGS: 00000006
RAX: 00000000013f5df3 RBX: ffff888026018000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff8e1a6fd9 RDI: ffff8880260196f8
RBP: ffffc900254f7d28 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: ffff888075f6a540
R13: 0000000000000001 R14: ffffffff9122a244 R15: ffff88802b33b600
FS: 00007f4d31fa0880(0000) GS:ffff888096cee000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000ffd59f7c CR3: 00000000498b7000 CR4: 0000000000352ef0
Call Trace:
RIP: 0010:finish_task_switch.isra.0+0x2cd/0x10c0 kernel/sched/core.c:5361
Code: ab 0a 00 00 41 c7 87 20 0e 00 00 00 00 00 00 e9 47 04 00 00 49 8d 7f 48 e8 60 3b e5 09 e8 bb 8b 3c 00 fb 48 8d bb f8 16 00 00 <48> b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 0f b6 04 02 84
RSP: 0018:ffffc900254f7cd0 EFLAGS: 00000206
context_switch kernel/sched/core.c:5513 [inline]
__schedule+0x1264/0x6730 kernel/sched/core.c:7234
__schedule_loop kernel/sched/core.c:7311 [inline]
schedule+0xdd/0x2c0 kernel/sched/core.c:7326
__exit_to_user_mode_loop kernel/entry/common.c:55 [inline]
exit_to_user_mode_loop+0x7e/0x6f0 kernel/entry/common.c:101
__exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline]
syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:230 [inline]
syscall_exit_to_user_mode include/linux/entry-common.h:318 [inline]
do_syscall_64+0x652/0x840 arch/x86/entry/syscall_64.c:100
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f4d31915a67
Code: 44 00 00 48 83 ec 10 48 63 ff 45 31 c9 45 31 c0 6a 01 31 c9 e8 ca 19 f9 ff 48 83 c4 18 c3 0f 1f 44 00 00 b8 03 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 8b 15 61 b3 0d 00 f7 d8 64 89 02 b8
RSP: 002b:00007ffe78ad5ad8 EFLAGS: 00000202 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 000055726fa0c010 RCX: 00007f4d31915a67
RDX: fffffffffffff000 RSI: 00007f4d319f1b20 RDI: 000000000000000f
RBP: 000055726f9b1400 R08: 000000000003cc10 R09: 0000000000000000
R10: 0000000000000003 R11: 0000000000000202 R12: 000055726f9c47b0
R13: 00000000000000fd R14: 0000557247cbcbe0 R15: 00007ffe78ad5dd0
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 14840 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:__sanitizer_cov_trace_pc+0x0/0x70 kernel/kcov.c:210
Code: d6 ee 5d 00 48 89 df 5b e9 7d 69 63 00 be 03 00 00 00 5b e9 92 e2 11 03 66 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1e fa 65 8b 05 65 f7 59 12 48 8b 34 24 65 48 8b 15 41 f7 59
RSP: 0000:ffffc9000376f8f0 EFLAGS: 00000046
RAX: 0000000000000000 RBX: 0000000000000001 RCX: ffffffff821160e5
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff888029772540
RBP: ffff88806e4eca80 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff888029772540
R13: 0000000000000000 R14: ffff88806e4eca80 R15: ffff88802b23b600
FS: 0000000000000000(0000) GS:ffff888096bee000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000080008000 CR3: 00000000638f0000 CR4: 0000000000352ef0
Call Trace:
tracing_record_taskinfo_sched_switch+0xac/0x560 kernel/trace/trace_sched_switch.c:425
probe_sched_switch+0x62/0x90 kernel/trace/trace_sched_switch.c:36
__do_trace_sched_switch include/trace/events/sched.h:220 [inline]
trace_sched_switch include/trace/events/sched.h:220 [inline]
__schedule+0x2e64/0x6730 kernel/sched/core.c:7231
preempt_schedule_common+0x42/0xc0 kernel/sched/core.c:7413
preempt_schedule_thunk+0x16/0x40 arch/x86/entry/thunk.S:12
__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:179 [inline]
_raw_spin_unlock_irqrestore+0x61/0x80 kernel/locking/spinlock.c:198
spin_unlock_irqrestore include/linux/spinlock.h:408 [inline]
class_spinlock_irqsave_destructor include/linux/spinlock.h:619 [inline]
snd_rawmidi_transmit+0xf1/0x130 sound/core/rawmidi.c:1486
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