INFO: task syz.8.3035:17163 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.8.3035 state:D stack:26400 pid:17163 tgid:17160 ppid:12656 task_flags:0x400040 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5520 [inline]
__schedule+0x1259/0x6920 kernel/sched/core.c:7270
__schedule_loop kernel/sched/core.c:7347 [inline]
schedule+0xdd/0x2c0 kernel/sched/core.c:7362
io_schedule+0x8a/0xf0 kernel/sched/core.c:8190
folio_wait_bit_common+0x3c0/0xac0 mm/filemap.c:1329
folio_lock include/linux/pagemap.h:1186 [inline]
migrate_folio_unmap mm/migrate.c:1261 [inline]
migrate_pages_batch+0x81d/0x46f0 mm/migrate.c:1919
migrate_pages_sync+0x4db/0x880 mm/migrate.c:2063
migrate_pages+0x1a83/0x2850 mm/migrate.c:2145
compact_zone+0x2643/0x4640 mm/compaction.c:2698
compact_node+0x17f/0x2c0 mm/compaction.c:2945
compact_nodes mm/compaction.c:2967 [inline]
sysctl_compaction_handler mm/compaction.c:3018 [inline]
sysctl_compaction_handler+0x141/0x210 mm/compaction.c:3005
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_sys_sendfile64 fs/read_write.c:1426 [inline]
__se_sys_sendfile64 fs/read_write.c:1418 [inline]
__x64_sys_sendfile64+0x154/0x220 fs/read_write.c:1418
do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fbb5059e0d9
RSP: 002b:00007fbb514a0028 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 00007fbb50825fa0 RCX: 00007fbb5059e0d9
RDX: 00002000000000c0 RSI: 0000000000000003 RDI: 0000000000000004
RBP: 00007fbb50635024 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000005 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fbb50826038 R14: 00007fbb50825fa0 R15: 00007fffe159e4e8
Showing all locks held in the system:
locks held by khungtaskd/43: 1, last CPU#0:
#0: ffffffff8ede9d40 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:300 [inline]
#0: ffffffff8ede9d40 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:840 [inline]
#0: ffffffff8ede9d40 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x3d/0x184 kernel/locking/lockdep.c:6793
locks held by getty/5527: 2, last CPU#2:
#0: ffff8880235800a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x24/0x80 drivers/tty/tty_ldisc.c:243
#1: ffff8880235804f8 (&tty->atomic_write_lock){+.+.}-{4:4}, at: tty_write_lock drivers/tty/tty_io.c:939 [inline]
#1: ffff8880235804f8 (&tty->atomic_write_lock){+.+.}-{4:4}, at: iterate_tty_write drivers/tty/tty_io.c:958 [inline]
#1: ffff8880235804f8 (&tty->atomic_write_lock){+.+.}-{4:4}, at: file_tty_write.isra.0+0x24b/0x890 drivers/tty/tty_io.c:1054
locks held by udevd/11294: 1, on CPU#0:
#0: ffff888028fe3350 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0x41a/0xe40 block/bdev.c:990
locks held by syz.8.3035/17163: 1, on CPU#2:
#0: ffff88802ee84460 (sb_writers#3){.+.+}-{0:0}, at: splice_direct_to_actor+0x345/0xa30 fs/splice.c:1103
=============================================
NMI backtrace for cpu 0
CPU: 0 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:123
nmi_trigger_cpumask_backtrace+0x21f/0x2a0 lib/nmi_backtrace.c:66
trigger_all_cpu_backtrace include/linux/nmi.h:164 [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+0x373/0x450 kernel/kthread.c:436
ret_from_fork+0x730/0xd60 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Sending NMI from CPU 0 to CPUs 2:
NMI backtrace for cpu 2
CPU: 2 UID: 0 PID: 20232 Comm: syz.1.3816 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:__debug_check_no_obj_freed lib/debugobjects.c:1163 [inline]
RIP: 0010:debug_check_no_obj_freed+0x210/0x630 lib/debugobjects.c:1201
Code: 00 00 48 89 c2 31 f6 49 89 df 4c 89 74 24 28 48 c1 ea 03 89 f3 42 80 3c 22 00 0f 85 dd 00 00 00 48 8d 78 18 83 c3 01 4c 8b 30 <48> 89 fa 48 c1 ea 03 42 80 3c 22 00 0f 85 27 03 00 00 48 8b 50 18
RSP: 0018:ffffc900039ff740 EFLAGS: 00000012
RAX: ffff88802befd4d0 RBX: 0000000000000020 RCX: ffffffff81e6ac68
RDX: 1ffff110057dfa9a RSI: 0000000000000000 RDI: ffff88802befd4e8
RBP: ffffc900039ff870 R08: 0000000000000001 R09: fffff5200073fed6
R10: 0000000000000003 R11: 0000000000000000 R12: dffffc0000000000
R13: ffff88812b095000 R14: ffff88803cfd87a8 R15: ffff88812b096000
FS: 0000000000000000(0000) GS:ffff8880d5da2000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000559484e2fce8 CR3: 000000002a719000 CR4: 0000000000352ef0
Call Trace:
__free_pages_prepare mm/page_alloc.c:1425 [inline]
free_pages_prepare+0x3a7/0xe00 mm/page_alloc.c:1463
__free_contig_range_common+0x14f/0x250 mm/page_alloc.c:7060
__free_contig_range mm/page_alloc.c:7105 [inline]
free_pages_bulk+0x12a/0x200 mm/page_alloc.c:5322
vm_area_free_pages+0xad/0x2b0 mm/vmalloc.c:3462
vfree mm/vmalloc.c:3511 [inline]
vfree+0x108/0x730 mm/vmalloc.c:3485
kcov_put kernel/kcov.c:447 [inline]
kcov_put kernel/kcov.c:443 [inline]
kcov_close+0x34/0x60 kernel/kcov.c:554
__fput+0x3ff/0xb50 fs/file_table.c:512
task_work_run+0x150/0x240 kernel/task_work.c:233
exit_task_work include/linux/task_work.h:40 [inline]
do_exit+0x951/0x2ae0 kernel/exit.c:1008
do_group_exit+0xd5/0x2a0 kernel/exit.c:1151
get_signal+0x1ec7/0x21e0 kernel/signal.c:3046
arch_do_signal_or_restart+0x91/0x7e0 arch/x86/kernel/signal.c:337
__exit_to_user_mode_loop kernel/entry/common.c:66 [inline]
exit_to_user_mode_loop+0x139/0x700 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:336 [inline]
do_syscall_64+0x661/0x790 arch/x86/entry/syscall_64.c:89
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fac5679e0d9
Code: Unable to access opcode bytes at 0x7fac5679e0af.
RSP: 002b:00007fac576b1028 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: fffffffffffffff5 RBX: 00007fac56a25fa0 RCX: 00007fac5679e0d9
RDX: 0000000000000090 RSI: 00002000000000c0 RDI: 0000000000000005
RBP: 00007fac56835024 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fac56a26038 R14: 00007fac56a25fa0 R15: 00007fffdd86c7a8