INFO: task syz-executor.0:1276 blocked for more than 143 seconds.
Not tainted 5.8.0-rc4-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.0 D28752 1276 6817 0x00000004
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_preempt_disabled+0xf/0x20 kernel/sched/core.c:4312
__mutex_lock_common kernel/locking/mutex.c:1033 [inline]
__mutex_lock+0x3e2/0x10d0 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+0x266/0x770 fs/char_dev.c:414
do_dentry_open+0x501/0x1290 fs/open.c:828
do_open fs/namei.c:3243 [inline]
path_openat+0x1bb9/0x2750 fs/namei.c:3360
do_filp_open+0x17e/0x3c0 fs/namei.c:3387
do_sys_openat2+0x16f/0x3b0 fs/open.c:1179
do_sys_open fs/open.c:1195 [inline]
__do_sys_openat fs/open.c:1209 [inline]
__se_sys_openat fs/open.c:1204 [inline]
__x64_sys_openat+0x13f/0x1f0 fs/open.c:1204
do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:384
entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45cba9
Code: Bad RIP value.
RSP: 002b:00007ff886abac78 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00000000004f8c00 RCX: 000000000045cba9
RDX: 0000000000000000 RSI: 0000000020000180 RDI: ffffffffffffff9c
RBP: 000000000078bfa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000000007c6 R14: 00000000004cabb1 R15: 00007ff886abb6d4
INFO: task syz-executor.5:1280 blocked for more than 143 seconds.
Not tainted 5.8.0-rc4-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.5 D28680 1280 7281 0x00004004
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_preempt_disabled+0xf/0x20 kernel/sched/core.c:4312
__mutex_lock_common kernel/locking/mutex.c:1033 [inline]
__mutex_lock+0x3e2/0x10d0 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+0x266/0x770 fs/char_dev.c:414
do_dentry_open+0x501/0x1290 fs/open.c:828
do_open fs/namei.c:3243 [inline]
path_openat+0x1bb9/0x2750 fs/namei.c:3360
do_filp_open+0x17e/0x3c0 fs/namei.c:3387
do_sys_openat2+0x16f/0x3b0 fs/open.c:1179
do_sys_open fs/open.c:1195 [inline]
__do_sys_openat fs/open.c:1209 [inline]
__se_sys_openat fs/open.c:1204 [inline]
__x64_sys_openat+0x13f/0x1f0 fs/open.c:1204
do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:384
entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45cba9
Code: Bad RIP value.
RSP: 002b:00007f4b2c645c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00000000004f8c00 RCX: 000000000045cba9
RDX: 0000000000000000 RSI: 0000000020000180 RDI: ffffffffffffff9c
RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000000007c6 R14: 00000000004cabb1 R15: 00007f4b2c6466d4
INFO: task syz-executor.5:1282 blocked for more than 143 seconds.
Not tainted 5.8.0-rc4-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.5 D28752 1282 7281 0x00000004
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_preempt_disabled+0xf/0x20 kernel/sched/core.c:4312
__mutex_lock_common kernel/locking/mutex.c:1033 [inline]
__mutex_lock+0x3e2/0x10d0 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+0x266/0x770 fs/char_dev.c:414
do_dentry_open+0x501/0x1290 fs/open.c:828
do_open fs/namei.c:3243 [inline]
path_openat+0x1bb9/0x2750 fs/namei.c:3360
do_filp_open+0x17e/0x3c0 fs/namei.c:3387
do_sys_openat2+0x16f/0x3b0 fs/open.c:1179
do_sys_open fs/open.c:1195 [inline]
__do_sys_openat fs/open.c:1209 [inline]
__se_sys_openat fs/open.c:1204 [inline]
__x64_sys_openat+0x13f/0x1f0 fs/open.c:1204
do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:384
entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45cba9
Code: Bad RIP value.
RSP: 002b:00007f4b2c624c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00000000004f8c00 RCX: 000000000045cba9
RDX: 0000000000000000 RSI: 0000000020000180 RDI: ffffffffffffff9c
RBP: 000000000078bfa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000000007c6 R14: 00000000004cabb1 R15: 00007f4b2c6256d4
Showing all locks held in the system:
1 lock held by khungtaskd/1149:
#0: ffffffff89bc11c0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:5779
1 lock held by in:imklog/6496:
#0: ffff8880a848d0f0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:826
2 locks held by syz-executor.0/1270:
1 lock held by syz-executor.0/1276:
#0: ffff8880a36f1078 (&fb_info->lock){+.+.}-{3:3}, at: lock_fb_info include/linux/fb.h:637 [inline]
#0: ffff8880a36f1078 (&fb_info->lock){+.+.}-{3:3}, at: fb_open+0xd3/0x430 drivers/video/fbdev/core/fbmem.c:1418
1 lock held by syz-executor.5/1280:
#0: ffff8880a36f1078 (&fb_info->lock){+.+.}-{3:3}, at: lock_fb_info include/linux/fb.h:637 [inline]
#0: ffff8880a36f1078 (&fb_info->lock){+.+.}-{3:3}, at: fb_open+0xd3/0x430 drivers/video/fbdev/core/fbmem.c:1418
1 lock held by syz-executor.5/1282:
#0: ffff8880a36f1078 (&fb_info->lock){+.+.}-{3:3}, at: lock_fb_info include/linux/fb.h:637 [inline]
#0: ffff8880a36f1078 (&fb_info->lock){+.+.}-{3:3}, at: fb_open+0xd3/0x430 drivers/video/fbdev/core/fbmem.c:1418
=============================================
NMI backtrace for cpu 1
CPU: 1 PID: 1149 Comm: khungtaskd Not tainted 5.8.0-rc4-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: 1270 Comm: syz-executor.0 Not tainted 5.8.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:__sanitizer_cov_trace_pc+0x30/0x60 kernel/kcov.c:197
Code: ff 01 00 65 8b 05 20 47 8e 7e a9 00 01 ff 00 48 8b 34 24 74 0f f6 c4 01 74 35 8b 82 04 14 00 00 85 c0 74 2b 8b 82 e0 13 00 00 <83> f8 02 75 20 48 8b 8a e8 13 00 00 8b 92 e4 13 00 00 48 8b 01 48
RSP: 0018:ffffc900173f7488 EFLAGS: 00000246
RAX: 0000000000000002 RBX: 0000000000000000 RCX: ffffffff83c20d09
RDX: ffff888016b2c340 RSI: ffffffff83c20d1b RDI: 0000000000000004
RBP: 0000000000000040 R08: 0000000000000040 R09: 0000000000000040
R10: 0000000000000040 R11: 0000000000000000 R12: 0000000000000040
R13: ffff8880000a0000 R14: 0000000000000000 R15: 0000000000000000
FS: 00007ff886adc700(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000562299402e9f CR3: 00000000405f1000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
bitfill_aligned drivers/video/fbdev/core/cfbfillrect.c:48 [inline]
bitfill_aligned+0x7b/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_set_all_vcs+0x3b6/0x470 drivers/video/fbdev/core/fbcon.c:3039
fbcon_update_vcs+0x26/0x50 drivers/video/fbdev/core/fbcon.c:3046
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:384
entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45cba9
Code: Bad RIP value.
RSP: 002b:00007ff886adbc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00000000004e5a00 RCX: 000000000045cba9
RDX: 0000000020000000 RSI: 0000000000004601 RDI: 0000000000000003
RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000000002fe R14: 00000000004c5931 R15: 00007ff886adc6d4