INFO: task kworker/1:4:2589 blocked for more than 143 seconds.
Not tainted 5.8.0-rc3-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
kworker/1:4 D23488 2589 2 0x00004000
Workqueue: events console_callback
Call Trace:
context_switch kernel/sched/core.c:3453 [inline]
__schedule+0x8e1/0x1eb0 kernel/sched/core.c:4178
schedule+0xd0/0x2a0 kernel/sched/core.c:4253
schedule_timeout+0x1d8/0x250 kernel/time/timer.c:1873
__down_common kernel/locking/semaphore.c:220 [inline]
__down+0x183/0x2a0 kernel/locking/semaphore.c:237
down+0x57/0x80 kernel/locking/semaphore.c:61
console_lock+0x25/0x80 kernel/printk/printk.c:2309
console_callback+0x61/0x410 drivers/tty/vt/vt.c:2844
process_one_work+0x94c/0x1670 kernel/workqueue.c:2269
worker_thread+0x64c/0x1120 kernel/workqueue.c:2415
kthread+0x3b5/0x4a0 kernel/kthread.c:291
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:293
INFO: task kworker/u4:7:15060 blocked for more than 143 seconds.
Not tainted 5.8.0-rc3-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
kworker/u4:7 D25016 15060 2 0x00004000
Workqueue: events_unbound flush_to_ldisc
Call Trace:
context_switch kernel/sched/core.c:3453 [inline]
__schedule+0x8e1/0x1eb0 kernel/sched/core.c:4178
schedule+0xd0/0x2a0 kernel/sched/core.c:4253
schedule_timeout+0x1d8/0x250 kernel/time/timer.c:1873
__down_common kernel/locking/semaphore.c:220 [inline]
__down+0x183/0x2a0 kernel/locking/semaphore.c:237
down+0x57/0x80 kernel/locking/semaphore.c:61
console_lock+0x25/0x80 kernel/printk/printk.c:2309
do_con_write+0x11e/0x7400 drivers/tty/vt/vt.c:2596
con_put_char+0x96/0xe0 drivers/tty/vt/vt.c:3169
tty_put_char+0xb7/0x150 drivers/tty/tty_io.c:3031
do_output_char+0x155/0x850 drivers/tty/n_tty.c:488
__process_echoes+0x38e/0x9f0 drivers/tty/n_tty.c:739
flush_echoes drivers/tty/n_tty.c:829 [inline]
__receive_buf drivers/tty/n_tty.c:1648 [inline]
n_tty_receive_buf_common+0xb88/0x2bc0 drivers/tty/n_tty.c:1742
tty_ldisc_receive_buf+0xa9/0x190 drivers/tty/tty_buffer.c:461
tty_port_default_receive_buf+0x6e/0xa0 drivers/tty/tty_port.c:38
receive_buf drivers/tty/tty_buffer.c:481 [inline]
flush_to_ldisc+0x20d/0x380 drivers/tty/tty_buffer.c:533
process_one_work+0x94c/0x1670 kernel/workqueue.c:2269
worker_thread+0x64c/0x1120 kernel/workqueue.c:2415
kthread+0x3b5/0x4a0 kernel/kthread.c:291
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:293
Showing all locks held in the system:
1 lock held by khungtaskd/1146:
#0: ffffffff89bc1140 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:5779
2 locks held by kworker/1:4/2589:
#0: ffff8880aa026d38 ((wq_completion)events){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline]
#0: ffff8880aa026d38 ((wq_completion)events){+.+.}-{0:0}, at: atomic64_set include/asm-generic/atomic-instrumented.h:856 [inline]
#0: ffff8880aa026d38 ((wq_completion)events){+.+.}-{0:0}, at: atomic_long_set include/asm-generic/atomic-long.h:41 [inline]
#0: ffff8880aa026d38 ((wq_completion)events){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:616 [inline]
#0: ffff8880aa026d38 ((wq_completion)events){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:643 [inline]
#0: ffff8880aa026d38 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x82b/0x1670 kernel/workqueue.c:2240
#1: ffffc900085b7da8 (console_work){+.+.}-{0:0}, at: process_one_work+0x85f/0x1670 kernel/workqueue.c:2244
1 lock held by in:imklog/6492:
#0: ffff8880a20b1370 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:826
2 locks held by agetty/6727:
#0: ffff8880a7bcc098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:267
#1: ffffc90000f602e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x223/0x1a30 drivers/tty/n_tty.c:2156
2 locks held by agetty/6728:
#0: ffff8880949ad098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:267
#1: ffffc90000fb02e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x223/0x1a30 drivers/tty/n_tty.c:2156
6 locks held by kworker/u4:7/15060:
#0: ffff8880aa034138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline]
#0: ffff8880aa034138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: atomic64_set include/asm-generic/atomic-instrumented.h:856 [inline]
#0: ffff8880aa034138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: atomic_long_set include/asm-generic/atomic-long.h:41 [inline]
#0: ffff8880aa034138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:616 [inline]
#0: ffff8880aa034138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:643 [inline]
#0: ffff8880aa034138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x82b/0x1670 kernel/workqueue.c:2240
#1: ffffc900054a7da8 ((work_completion)(&buf->work)){+.+.}-{0:0}, at: process_one_work+0x85f/0x1670 kernel/workqueue.c:2244
#2: ffff8880aa1c40b8 (&buf->lock){+.+.}-{3:3}, at: flush_to_ldisc+0x3e/0x380 drivers/tty/tty_buffer.c:505
#3: ffff8880949ad098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref+0x1d/0x80 drivers/tty/tty_ldisc.c:288
#4: ffff8880949ad2e8 (&tty->termios_rwsem){++++}-{3:3}, at: n_tty_receive_buf_common+0x89/0x2bc0 drivers/tty/n_tty.c:1705
#5: ffffc90000fb0378 (&ldata->output_lock){+.+.}-{3:3}, at: flush_echoes drivers/tty/n_tty.c:827 [inline]
#5: ffffc90000fb0378 (&ldata->output_lock){+.+.}-{3:3}, at: __receive_buf drivers/tty/n_tty.c:1648 [inline]
#5: ffffc90000fb0378 (&ldata->output_lock){+.+.}-{3:3}, at: n_tty_receive_buf_common+0xb49/0x2bc0 drivers/tty/n_tty.c:1742
2 locks held by syz-executor.3/25897:
=============================================
NMI backtrace for cpu 1
CPU: 1 PID: 1146 Comm: khungtaskd Not tainted 5.8.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x18f/0x20d lib/dump_stack.c:118
nmi_cpu_backtrace.cold+0x70/0xb1 lib/nmi_backtrace.c:101
nmi_trigger_cpumask_backtrace+0x1b3/0x223 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:209 [inline]
watchdog+0xd7d/0x1000 kernel/hung_task.c:295
kthread+0x3b5/0x4a0 kernel/kthread.c:291
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:293
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 25897 Comm: syz-executor.3 Not tainted 5.8.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:get_current arch/x86/include/asm/current.h:15 [inline]
RIP: 0010:write_comp_data+0xa/0x80 kernel/kcov.c:217
Code: 65 48 8b 04 25 00 ff 01 00 48 8b 80 f8 13 00 00 c3 0f 1f 44 00 00 66 2e 0f 1f 84 00 00 00 00 00 49 89 f2 65 8b 05 56 4c 8e 7e <65> 48 8b 34 25 00 ff 01 00 a9 00 01 ff 00 74 0f f6 c4 01 74 59 8b
RSP: 0018:ffffc900160974e8 EFLAGS: 00000216
RAX: 0000000080000000 RBX: 0000000000000000 RCX: ffffffff83c1fd29
RDX: 0000000000000018 RSI: 0000000000000007 RDI: 0000000000000005
RBP: ffff8880000a01c0 R08: 0000000000001400 R09: 0000000000000040
R10: 0000000000000007 R11: 0000000000000000 R12: 0000000000000050
R13: ffff8880000a0000 R14: 0000000000000000 R15: 0000000000000018
FS: 00007f7e3d607700(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000c013557000 CR3: 00000000905ce000 CR4: 00000000001426f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
bitfill_aligned drivers/video/fbdev/core/cfbfillrect.c:63 [inline]
bitfill_aligned+0x139/0x200 drivers/video/fbdev/core/cfbfillrect.c:35
cfb_fillrect+0x40b/0x7b0 drivers/video/fbdev/core/cfbfillrect.c:327
vga16fb_fillrect+0x683/0x193b drivers/video/fbdev/vga16fb.c:951
bit_clear_margins+0x2d5/0x4a0 drivers/video/fbdev/core/bitblit.c:232
fbcon_clear_margins+0x1d5/0x230 drivers/video/fbdev/core/fbcon.c:1381
fbcon_switch+0xb6e/0x16c0 drivers/video/fbdev/core/fbcon.c:2363
redraw_screen+0x2ae/0x770 drivers/tty/vt/vt.c:1015
fbcon_modechanged+0x575/0x710 drivers/video/fbdev/core/fbcon.c:3001
fbcon_update_vcs+0x3a/0x50 drivers/video/fbdev/core/fbcon.c:3048
fb_set_var+0xae8/0xd60 drivers/video/fbdev/core/fbmem.c:1056
do_fb_ioctl+0x33f/0x6c0 drivers/video/fbdev/core/fbmem.c:1109
fb_ioctl+0xdd/0x130 drivers/video/fbdev/core/fbmem.c:1185
vfs_ioctl fs/ioctl.c:48 [inline]
ksys_ioctl+0x11a/0x180 fs/ioctl.c:753
__do_sys_ioctl fs/ioctl.c:762 [inline]
__se_sys_ioctl fs/ioctl.c:760 [inline]
__x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:760
do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:359
entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45cb29
Code: Bad RIP value.
RSP: 002b:00007f7e3d606c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00000000004e55a0 RCX: 000000000045cb29
RDX: 00000000200001c0 RSI: 0000000000004601 RDI: 0000000000000006
RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000000002fd R14: 00000000004c58a5 R15: 00007f7e3d6076d4