INFO: task syz-executor057:9498 blocked for more than 143 seconds.
Not tainted 5.6.0-rc6-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor057 D28392 9498 9497 0x20024004
Call Trace:
schedule+0xd0/0x2a0 kernel/sched/core.c:4154
schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:4213
__mutex_lock_common kernel/locking/mutex.c:1033 [inline]
__mutex_lock+0x7ab/0x13c0 kernel/locking/mutex.c:1103
lock_fb_info include/linux/fb.h:637 [inline]
fb_open+0xd3/0x430 drivers/video/fbdev/core/fbmem.c:1418
chrdev_open+0x219/0x5c0 fs/char_dev.c:414
do_dentry_open+0x4a2/0x1250 fs/open.c:797
do_last fs/namei.c:3490 [inline]
path_openat+0x122a/0x32b0 fs/namei.c:3607
do_filp_open+0x192/0x260 fs/namei.c:3637
do_sys_openat2+0x54c/0x740 fs/open.c:1146
do_sys_open+0xc3/0x140 fs/open.c:1162
do_syscall_32_irqs_on arch/x86/entry/common.c:337 [inline]
do_fast_syscall_32+0x270/0xe8f arch/x86/entry/common.c:408
entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139
INFO: task syz-executor057:9499 blocked for more than 143 seconds.
Not tainted 5.6.0-rc6-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor057 D28392 9499 9496 0x20020004
Call Trace:
schedule+0xd0/0x2a0 kernel/sched/core.c:4154
schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:4213
__mutex_lock_common kernel/locking/mutex.c:1033 [inline]
__mutex_lock+0x7ab/0x13c0 kernel/locking/mutex.c:1103
lock_fb_info include/linux/fb.h:637 [inline]
fb_open+0xd3/0x430 drivers/video/fbdev/core/fbmem.c:1418
chrdev_open+0x219/0x5c0 fs/char_dev.c:414
do_dentry_open+0x4a2/0x1250 fs/open.c:797
do_last fs/namei.c:3490 [inline]
path_openat+0x122a/0x32b0 fs/namei.c:3607
do_filp_open+0x192/0x260 fs/namei.c:3637
do_sys_openat2+0x54c/0x740 fs/open.c:1146
do_sys_open+0xc3/0x140 fs/open.c:1162
do_syscall_32_irqs_on arch/x86/entry/common.c:337 [inline]
do_fast_syscall_32+0x270/0xe8f arch/x86/entry/common.c:408
entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139
INFO: task syz-executor057:9500 blocked for more than 143 seconds.
Not tainted 5.6.0-rc6-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor057 D28392 9500 9494 0x20020004
Call Trace:
schedule+0xd0/0x2a0 kernel/sched/core.c:4154
schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:4213
__mutex_lock_common kernel/locking/mutex.c:1033 [inline]
__mutex_lock+0x7ab/0x13c0 kernel/locking/mutex.c:1103
lock_fb_info include/linux/fb.h:637 [inline]
fb_open+0xd3/0x430 drivers/video/fbdev/core/fbmem.c:1418
chrdev_open+0x219/0x5c0 fs/char_dev.c:414
do_dentry_open+0x4a2/0x1250 fs/open.c:797
do_last fs/namei.c:3490 [inline]
path_openat+0x122a/0x32b0 fs/namei.c:3607
do_filp_open+0x192/0x260 fs/namei.c:3637
do_sys_openat2+0x54c/0x740 fs/open.c:1146
do_sys_open+0xc3/0x140 fs/open.c:1162
do_syscall_32_irqs_on arch/x86/entry/common.c:337 [inline]
do_fast_syscall_32+0x270/0xe8f arch/x86/entry/common.c:408
entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139
INFO: task syz-executor057:9501 blocked for more than 143 seconds.
Not tainted 5.6.0-rc6-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor057 D28288 9501 9492 0x20020004
Call Trace:
schedule+0xd0/0x2a0 kernel/sched/core.c:4154
schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:4213
__mutex_lock_common kernel/locking/mutex.c:1033 [inline]
__mutex_lock+0x7ab/0x13c0 kernel/locking/mutex.c:1103
lock_fb_info include/linux/fb.h:637 [inline]
fb_open+0xd3/0x430 drivers/video/fbdev/core/fbmem.c:1418
chrdev_open+0x219/0x5c0 fs/char_dev.c:414
do_dentry_open+0x4a2/0x1250 fs/open.c:797
do_last fs/namei.c:3490 [inline]
path_openat+0x122a/0x32b0 fs/namei.c:3607
do_filp_open+0x192/0x260 fs/namei.c:3637
do_sys_openat2+0x54c/0x740 fs/open.c:1146
do_sys_open+0xc3/0x140 fs/open.c:1162
do_syscall_32_irqs_on arch/x86/entry/common.c:337 [inline]
do_fast_syscall_32+0x270/0xe8f arch/x86/entry/common.c:408
entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139
INFO: task syz-executor057:9502 blocked for more than 143 seconds.
Not tainted 5.6.0-rc6-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor057 D28392 9502 9495 0x20020004
Call Trace:
schedule+0xd0/0x2a0 kernel/sched/core.c:4154
schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:4213
__mutex_lock_common kernel/locking/mutex.c:1033 [inline]
__mutex_lock+0x7ab/0x13c0 kernel/locking/mutex.c:1103
lock_fb_info include/linux/fb.h:637 [inline]
fb_open+0xd3/0x430 drivers/video/fbdev/core/fbmem.c:1418
chrdev_open+0x219/0x5c0 fs/char_dev.c:414
do_dentry_open+0x4a2/0x1250 fs/open.c:797
do_last fs/namei.c:3490 [inline]
path_openat+0x122a/0x32b0 fs/namei.c:3607
do_filp_open+0x192/0x260 fs/namei.c:3637
do_sys_openat2+0x54c/0x740 fs/open.c:1146
do_sys_open+0xc3/0x140 fs/open.c:1162
do_syscall_32_irqs_on arch/x86/entry/common.c:337 [inline]
do_fast_syscall_32+0x270/0xe8f arch/x86/entry/common.c:408
entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139
Showing all locks held in the system:
1 lock held by khungtaskd/1138:
#0: ffffffff897accc0 (rcu_read_lock){....}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:5331
1 lock held by rsyslogd/9374:
#0: ffff888095d3c860 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xe3/0x100 fs/file.c:821
2 locks held by getty/9464:
#0: ffff8880a8e99090 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:267
#1: ffffc900017eb2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x21d/0x1b30 drivers/tty/n_tty.c:2156
2 locks held by getty/9465:
#0: ffff888093e35090 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:267
#1: ffffc900017fb2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x21d/0x1b30 drivers/tty/n_tty.c:2156
2 locks held by getty/9466:
#0: ffff8880a8dc6090 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:267
#1: ffffc9000183b2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x21d/0x1b30 drivers/tty/n_tty.c:2156
2 locks held by getty/9467:
#0: ffff888091df0090 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:267
#1: ffffc9000181b2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x21d/0x1b30 drivers/tty/n_tty.c:2156
2 locks held by getty/9468:
#0: ffff88808e74d090 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:267
#1: ffffc9000186b2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x21d/0x1b30 drivers/tty/n_tty.c:2156
2 locks held by getty/9469:
#0: ffff88808c9c9090 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:267
#1: ffffc9000187b2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x21d/0x1b30 drivers/tty/n_tty.c:2156
2 locks held by getty/9470:
#0: ffff88808e9b9090 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:267
#1: ffffc900017bb2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x21d/0x1b30 drivers/tty/n_tty.c:2156
2 locks held by syz-executor057/9493:
1 lock held by syz-executor057/9498:
#0: ffff8880a3b0f070 (&fb_info->lock){+.+.}, at: lock_fb_info include/linux/fb.h:637 [inline]
#0: ffff8880a3b0f070 (&fb_info->lock){+.+.}, at: fb_open+0xd3/0x430 drivers/video/fbdev/core/fbmem.c:1418
1 lock held by syz-executor057/9499:
#0: ffff8880a3b0f070 (&fb_info->lock){+.+.}, at: lock_fb_info include/linux/fb.h:637 [inline]
#0: ffff8880a3b0f070 (&fb_info->lock){+.+.}, at: fb_open+0xd3/0x430 drivers/video/fbdev/core/fbmem.c:1418
1 lock held by syz-executor057/9500:
#0: ffff8880a3b0f070 (&fb_info->lock){+.+.}, at: lock_fb_info include/linux/fb.h:637 [inline]
#0: ffff8880a3b0f070 (&fb_info->lock){+.+.}, at: fb_open+0xd3/0x430 drivers/video/fbdev/core/fbmem.c:1418
1 lock held by syz-executor057/9501:
#0: ffff8880a3b0f070 (&fb_info->lock){+.+.}, at: lock_fb_info include/linux/fb.h:637 [inline]
#0: ffff8880a3b0f070 (&fb_info->lock){+.+.}, at: fb_open+0xd3/0x430 drivers/video/fbdev/core/fbmem.c:1418
1 lock held by syz-executor057/9502:
#0: ffff8880a3b0f070 (&fb_info->lock){+.+.}, at: lock_fb_info include/linux/fb.h:637 [inline]
#0: ffff8880a3b0f070 (&fb_info->lock){+.+.}, at: fb_open+0xd3/0x430 drivers/video/fbdev/core/fbmem.c:1418
=============================================
NMI backtrace for cpu 0
CPU: 0 PID: 1138 Comm: khungtaskd Not tainted 5.6.0-rc6-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+0x188/0x20d lib/dump_stack.c:118
nmi_cpu_backtrace.cold+0x70/0xb1 lib/nmi_backtrace.c:101
nmi_trigger_cpumask_backtrace+0x231/0x27e lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:205 [inline]
watchdog+0xa8c/0x1010 kernel/hung_task.c:289
kthread+0x357/0x430 kernel/kthread.c:255
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 9493 Comm: syz-executor057 Not tainted 5.6.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:writeb arch/x86/include/asm/io.h:65 [inline]
RIP: 0010:vga16fb_fillrect+0x9c1/0x1960 drivers/video/fbdev/vga16fb.c:923
Code: 45 31 f6 48 89 04 24 8d 43 ff 48 83 c0 01 48 89 44 24 08 e8 a1 51 bb fd 31 ff 89 de 31 ed e8 06 53 bb fd 85 db 4d 89 ec 74 22 <e8> 8a 51 bb fd 45 88 34 24 83 c5 01 89 df 49 83 c4 01 89 ee e8 66
RSP: 0018:ffffc900020974b8 EFLAGS: 00000216
RAX: 0000000000000000 RBX: 0000000000000050 RCX: ffffffff83b6d3aa
RDX: 000000000000002f RSI: 0000000000000050 RDI: 0000000000000004
RBP: 000000000000002f R08: ffff88809cccc1c0 R09: ffffed10147621dc
R10: ffffed10147621db R11: ffff8880a3b10edf R12: ffff8880000a002f
R13: ffff8880000a0000 R14: 0000000000000000 R15: 00000000ec40d007
FS: 0000000000000000(0000) GS:ffff8880ae700000(0063) knlGS:0000000009b1e840
CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: ffffffffff600400 CR3: 00000000a217d000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
bit_clear_margins+0x2d5/0x4a0 drivers/video/fbdev/core/bitblit.c:232
fbcon_clear_margins+0x1de/0x240 drivers/video/fbdev/core/fbcon.c:1379
fbcon_switch+0xd1b/0x1740 drivers/video/fbdev/core/fbcon.c:2361
redraw_screen+0x2a8/0x770 drivers/tty/vt/vt.c:1008
fbcon_modechanged+0x5bd/0x780 drivers/video/fbdev/core/fbcon.c:2998
fbcon_update_vcs+0x3a/0x50 drivers/video/fbdev/core/fbcon.c:3045
fb_set_var+0xad0/0xd40 drivers/video/fbdev/core/fbmem.c:1056
do_fb_ioctl+0x390/0x7d0 drivers/video/fbdev/core/fbmem.c:1109
fb_compat_ioctl+0x305/0xc50 drivers/video/fbdev/core/fbmem.c:1315
__do_compat_sys_ioctl fs/ioctl.c:857 [inline]
__se_compat_sys_ioctl fs/ioctl.c:808 [inline]
__ia32_compat_sys_ioctl+0x23d/0x2b0 fs/ioctl.c:808
do_syscall_32_irqs_on arch/x86/entry/common.c:337 [inline]
do_fast_syscall_32+0x270/0xe8f arch/x86/entry/common.c:408
entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139