NOHZ: local_softirq_pending 08
NOHZ: local_softirq_pending 08
NOHZ: local_softirq_pending 08
NOHZ: local_softirq_pending 08
NOHZ: local_softirq_pending 08
INFO: task syz-executor.1:3899 blocked for more than 140 seconds.
Not tainted 4.14.175-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.1 D28688 3899 6352 0x00000004
Call Trace:
schedule+0x8d/0x1b0 kernel/sched/core.c:3428
schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:3486
__mutex_lock_common kernel/locking/mutex.c:833 [inline]
__mutex_lock+0x73c/0x1470 kernel/locking/mutex.c:893
fb_release+0x4e/0x140 drivers/video/fbdev/core/fbmem.c:1497
__fput+0x25f/0x790 fs/file_table.c:210
task_work_run+0x113/0x190 kernel/task_work.c:113
tracehook_notify_resume include/linux/tracehook.h:191 [inline]
exit_to_usermode_loop+0x1d6/0x220 arch/x86/entry/common.c:164
prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline]
syscall_return_slowpath arch/x86/entry/common.c:270 [inline]
do_syscall_64+0x4a3/0x640 arch/x86/entry/common.c:297
entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x416421
RSP: 002b:00007fffe9590c90 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000005 RCX: 0000000000416421
RDX: 0000000000000000 RSI: 0000000000001cc1 RDI: 0000000000000004
RBP: 0000000000000001 R08: 0000000005de3cc1 R09: 0000000005de3cc5
R10: 00007fffe9590d70 R11: 0000000000000293 R12: 000000000076c900
R13: 000000000076c900 R14: 00000000000ead58 R15: 000000000076bfac
INFO: task syz-executor.3:3914 blocked for more than 140 seconds.
Not tainted 4.14.175-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.3 D29728 3914 6351 0x00000004
Call Trace:
schedule+0x8d/0x1b0 kernel/sched/core.c:3428
schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:3486
__mutex_lock_common kernel/locking/mutex.c:833 [inline]
__mutex_lock+0x73c/0x1470 kernel/locking/mutex.c:893
fb_open+0xb7/0x400 drivers/video/fbdev/core/fbmem.c:1468
chrdev_open+0x1fc/0x540 fs/char_dev.c:423
do_dentry_open+0x732/0xe90 fs/open.c:777
vfs_open+0x105/0x220 fs/open.c:888
do_last fs/namei.c:3428 [inline]
path_openat+0x8ca/0x3c50 fs/namei.c:3569
do_filp_open+0x18e/0x250 fs/namei.c:3603
do_sys_open+0x29d/0x3f0 fs/open.c:1081
do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x45c889
RSP: 002b:00007f4c01cdbc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f4c01cdc6d4 RCX: 000000000045c889
RDX: 0000000000000000 RSI: 0000000020000180 RDI: ffffffffffffff9c
RBP: 000000000076bfa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 0000000000000798 R14: 00000000004ca4f4 R15: 000000000076bfac
INFO: task syz-executor.0:3911 blocked for more than 140 seconds.
Not tainted 4.14.175-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.0 D28688 3911 6350 0x00000004
Call Trace:
schedule+0x8d/0x1b0 kernel/sched/core.c:3428
schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:3486
__mutex_lock_common kernel/locking/mutex.c:833 [inline]
__mutex_lock+0x73c/0x1470 kernel/locking/mutex.c:893
fb_release+0x4e/0x140 drivers/video/fbdev/core/fbmem.c:1497
__fput+0x25f/0x790 fs/file_table.c:210
task_work_run+0x113/0x190 kernel/task_work.c:113
tracehook_notify_resume include/linux/tracehook.h:191 [inline]
exit_to_usermode_loop+0x1d6/0x220 arch/x86/entry/common.c:164
prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline]
syscall_return_slowpath arch/x86/entry/common.c:270 [inline]
do_syscall_64+0x4a3/0x640 arch/x86/entry/common.c:297
entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x416421
RSP: 002b:00007ffc1a8d3190 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000004 RCX: 0000000000416421
RDX: 0000001b30220000 RSI: 0000000000001c0b RDI: 0000000000000003
RBP: 0000000000000001 R08: 0000000015629c0b R09: 0000000015629c0f
R10: 00007ffc1a8d3270 R11: 0000000000000293 R12: 000000000076c900
R13: 000000000076c900 R14: 00000000000eaf58 R15: 000000000076bf0c
INFO: task syz-executor.2:3926 blocked for more than 140 seconds.
Not tainted 4.14.175-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.2 D29728 3926 6348 0x00000004
Call Trace:
schedule+0x8d/0x1b0 kernel/sched/core.c:3428
schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:3486
__mutex_lock_common kernel/locking/mutex.c:833 [inline]
__mutex_lock+0x73c/0x1470 kernel/locking/mutex.c:893
fb_open+0xb7/0x400 drivers/video/fbdev/core/fbmem.c:1468
chrdev_open+0x1fc/0x540 fs/char_dev.c:423
do_dentry_open+0x732/0xe90 fs/open.c:777
vfs_open+0x105/0x220 fs/open.c:888
do_last fs/namei.c:3428 [inline]
path_openat+0x8ca/0x3c50 fs/namei.c:3569
do_filp_open+0x18e/0x250 fs/namei.c:3603
do_sys_open+0x29d/0x3f0 fs/open.c:1081
do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x45c889
RSP: 002b:00007fc4161f4c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007fc4161f56d4 RCX: 000000000045c889
RDX: 0000000000000000 RSI: 0000000020000180 RDI: ffffffffffffff9c
RBP: 000000000076bfa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 0000000000000798 R14: 00000000004ca4f4 R15: 000000000076bfac
Showing all locks held in the system:
1 lock held by khungtaskd/1057:
#0: (tasklist_lock){.+.+}, at: [<ffffffff81465bb3>] debug_show_all_locks+0x7c/0x21a kernel/locking/lockdep.c:4544
1 lock held by in:imklog/6001:
#0: (&f->f_pos_lock){+.+.}, at: [<ffffffff8191b836>] __fdget_pos+0xa6/0xc0 fs/file.c:769
1 lock held by syz-executor.1/3899:
#0: (&fb_info->lock){+.+.}, at: [<ffffffff831715be>] fb_release+0x4e/0x140 drivers/video/fbdev/core/fbmem.c:1497
1 lock held by syz-executor.3/3914:
#0: (&fb_info->lock){+.+.}, at: [<ffffffff83171ec7>] fb_open+0xb7/0x400 drivers/video/fbdev/core/fbmem.c:1468
1 lock held by syz-executor.0/3911:
#0: (&fb_info->lock){+.+.}, at: [<ffffffff831715be>] fb_release+0x4e/0x140 drivers/video/fbdev/core/fbmem.c:1497
1 lock held by syz-executor.2/3926:
#0: (&fb_info->lock){+.+.}, at: [<ffffffff83171ec7>] fb_open+0xb7/0x400 drivers/video/fbdev/core/fbmem.c:1468
=============================================
NMI backtrace for cpu 1
CPU: 1 PID: 1057 Comm: khungtaskd Not tainted 4.14.175-syzkaller #0
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+0x13e/0x194 lib/dump_stack.c:58
nmi_cpu_backtrace.cold+0x57/0x93 lib/nmi_backtrace.c:101
nmi_trigger_cpumask_backtrace+0x139/0x17e lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:140 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:195 [inline]
watchdog+0x5e2/0xb80 kernel/hung_task.c:274
kthread+0x30d/0x420 kernel/kthread.c:232
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 3921 Comm: syz-executor.2 Not tainted 4.14.175-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff888088118580 task.stack: ffff88821ad58000
RIP: 0010:__sanitizer_cov_trace_pc+0x28/0x50 kernel/kcov.c:93
RSP: 0018:ffff88821ad5f3c8 EFLAGS: 00000246
RAX: 0000000000040000 RBX: ffff8880000a0050 RCX: ffffc90005b1a000
RDX: 0000000000040000 RSI: ffffffff831ea6f3 RDI: ffff88821ad5f480
RBP: 0000000000000050 R08: 000000000000ffff R09: ffffed1043247af4
R10: ffffed1043247af3 R11: ffff88821923d79f R12: ffff8880000a0023
R13: 0000000000000000 R14: 00000000e298a622 R15: 000000000000004f
FS: 00007fc416216700(0000) GS:ffff8880aea00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000c441e7a950 CR3: 00000000a0db4000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
writeb arch/x86/include/asm/io.h:65 [inline]
vga16fb_fillrect+0x943/0x1880 drivers/video/fbdev/vga16fb.c:923
bit_clear_margins+0x2a4/0x480 drivers/video/fbdev/core/bitblit.c:232
fbcon_clear_margins+0x285/0x310 drivers/video/fbdev/core/fbcon.c:1317
fbcon_switch+0xcdf/0x1780 drivers/video/fbdev/core/fbcon.c:2299
redraw_screen+0x331/0x770 drivers/tty/vt/vt.c:689
fbcon_modechanged+0x59d/0x890 drivers/video/fbdev/core/fbcon.c:2946
fbcon_event_notify+0x11a/0x1746 drivers/video/fbdev/core/fbcon.c:3299
notifier_call_chain+0x107/0x1a0 kernel/notifier.c:93
__blocking_notifier_call_chain kernel/notifier.c:317 [inline]
__blocking_notifier_call_chain kernel/notifier.c:304 [inline]
blocking_notifier_call_chain kernel/notifier.c:328 [inline]
blocking_notifier_call_chain+0x79/0x90 kernel/notifier.c:325
fb_set_var+0xaad/0xc70 drivers/video/fbdev/core/fbmem.c:1054
do_fb_ioctl+0x3cc/0x940 drivers/video/fbdev/core/fbmem.c:1127
fb_ioctl+0xdd/0x130 drivers/video/fbdev/core/fbmem.c:1242
vfs_ioctl fs/ioctl.c:46 [inline]
file_ioctl fs/ioctl.c:500 [inline]
do_vfs_ioctl+0x75a/0xfe0 fs/ioctl.c:684
SYSC_ioctl fs/ioctl.c:701 [inline]
SyS_ioctl+0x7f/0xb0 fs/ioctl.c:692
do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x45c889
RSP: 002b:00007fc416215c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fc4162166d4 RCX: 000000000045c889
RDX: 0000000020000000 RSI: 0000000000004601 RDI: 0000000000000004
RBP: 000000000076bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000000002ee R14: 00000000004c54bc R15: 000000000076bf0c
Code: ff ff 90 65 48 8b 04 25 40 ee 01 00 48 85 c0 74 1a 65 8b 15 1b a7 a7 7e 81 e2 00 01 1f 00 75 0b 8b 90 50 13 00 00 83 fa 01 74 01 <c3> 48 8b 34 24 48 8b 88 58 13 00 00 8b 80 54 13 00 00 48 8b 11