INFO: task syz-executor7:24514 blocked for more than 120 seconds.
Not tainted 4.16.0-rc7+ #6
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor7 D20512 24514 4473 0x00000004
Call Trace:
context_switch kernel/sched/core.c:2862 [inline]
__schedule+0x8fb/0x1ec0 kernel/sched/core.c:3440
schedule+0xf5/0x430 kernel/sched/core.c:3499
io_schedule+0x1c/0x70 kernel/sched/core.c:5115
__blkdev_direct_IO_simple+0x7bd/0xf50 fs/block_dev.c:241
blkdev_direct_IO+0xccb/0x1060 fs/block_dev.c:428
generic_file_read_iter+0x4cc/0x28e0 mm/filemap.c:2343
blkdev_read_iter+0x105/0x170 fs/block_dev.c:1928
call_read_iter include/linux/fs.h:1776 [inline]
generic_file_splice_read+0x3f9/0x7b0 fs/splice.c:307
do_splice_to+0x10a/0x160 fs/splice.c:880
splice_direct_to_actor+0x242/0x820 fs/splice.c:952
do_splice_direct+0x29b/0x3c0 fs/splice.c:1061
do_sendfile+0x5c9/0xe80 fs/read_write.c:1413
SYSC_sendfile64 fs/read_write.c:1468 [inline]
SyS_sendfile64+0xbd/0x160 fs/read_write.c:1460
do_syscall_64+0x281/0x940 arch/x86/entry/common.c:287
entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x4548b9
RSP: 002b:00007f87fe7adc68 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 00007f87fe7ae6d4 RCX: 00000000004548b9
RDX: 0000000020000080 RSI: 0000000000000014 RDI: 0000000000000014
RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000102000004 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000000004c5 R14: 00000000006f9318 R15: 0000000000000000
Showing all locks held in the system:
2 locks held by khungtaskd/863:
#0: (rcu_read_lock){....}, at: [<00000000c91b2762>] check_hung_uninterruptible_tasks kernel/hung_task.c:175 [inline]
#0: (rcu_read_lock){....}, at: [<00000000c91b2762>] watchdog+0x1c5/0xd60 kernel/hung_task.c:249
#1: (tasklist_lock){.+.+}, at: [<00000000b7856669>] debug_show_all_locks+0xd3/0x3d0 kernel/locking/lockdep.c:4470
2 locks held by getty/4393:
#0: (&tty->ldisc_sem){++++}, at: [<000000005a87abed>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365
#1: (&ldata->atomic_read_lock){+.+.}, at: [<0000000021c6f29d>] n_tty_read+0x2ef/0x1a40 drivers/tty/n_tty.c:2131
2 locks held by getty/4394:
#0: (&tty->ldisc_sem){++++}, at: [<000000005a87abed>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365
#1: (&ldata->atomic_read_lock){+.+.}, at: [<0000000021c6f29d>] n_tty_read+0x2ef/0x1a40 drivers/tty/n_tty.c:2131
2 locks held by getty/4395:
#0: (&tty->ldisc_sem){++++}, at: [<000000005a87abed>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365
#1: (&ldata->atomic_read_lock){+.+.}, at: [<0000000021c6f29d>] n_tty_read+0x2ef/0x1a40 drivers/tty/n_tty.c:2131
2 locks held by getty/4396:
#0: (&tty->ldisc_sem){++++}, at: [<000000005a87abed>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365
#1: (&ldata->atomic_read_lock){+.+.}, at: [<0000000021c6f29d>] n_tty_read+0x2ef/0x1a40 drivers/tty/n_tty.c:2131
2 locks held by getty/4397:
#0: (&tty->ldisc_sem){++++}, at: [<000000005a87abed>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365
#1: (&ldata->atomic_read_lock){+.+.}, at: [<0000000021c6f29d>] n_tty_read+0x2ef/0x1a40 drivers/tty/n_tty.c:2131
2 locks held by getty/4398:
#0: (&tty->ldisc_sem){++++}, at: [<000000005a87abed>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365
#1: (&ldata->atomic_read_lock){+.+.}, at: [<0000000021c6f29d>] n_tty_read+0x2ef/0x1a40 drivers/tty/n_tty.c:2131
2 locks held by getty/4399:
#0: (&tty->ldisc_sem){++++}, at: [<000000005a87abed>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365
#1: (&ldata->atomic_read_lock){+.+.}, at: [<0000000021c6f29d>] n_tty_read+0x2ef/0x1a40 drivers/tty/n_tty.c:2131
=============================================
NMI backtrace for cpu 1
CPU: 1 PID: 863 Comm: khungtaskd Not tainted 4.16.0-rc7+ #6
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:17 [inline]
dump_stack+0x194/0x24d lib/dump_stack.c:53
nmi_cpu_backtrace+0x1d2/0x210 lib/nmi_backtrace.c:103
nmi_trigger_cpumask_backtrace+0x123/0x180 lib/nmi_backtrace.c:62
arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38
trigger_all_cpu_backtrace include/linux/nmi.h:138 [inline]
check_hung_task kernel/hung_task.c:132 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:190 [inline]
watchdog+0x90c/0xd60 kernel/hung_task.c:249
kthread+0x33c/0x400 kernel/kthread.c:238
ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:406
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0 skipped: idling at native_safe_halt+0x6/0x10 arch/x86/include/asm/irqflags.h:54