INFO: task syz-executor.3:1140 blocked for more than 143 seconds.
Not tainted 5.8.0-rc6-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.3 D28704 1140 7221 0x00004004
Call Trace:
context_switch kernel/sched/core.c:3458 [inline]
__schedule+0x91f/0x2250 kernel/sched/core.c:4215
schedule+0xd0/0x2a0 kernel/sched/core.c:4290
schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:4349
__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: 0033:0x45c1f9
Code: Bad RIP value.
RSP: 002b:00007f2494fbfc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 0000000000020ec0 RCX: 000000000045c1f9
RDX: 0000000000000000 RSI: 0000000020000180 RDI: ffffffffffffff9c
RBP: 000000000078bf48 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000078bf0c
R13: 0000000000c9fb6f R14: 00007f2494fc09c0 R15: 000000000078bf0c
INFO: task syz-executor.5:1167 blocked for more than 143 seconds.
Not tainted 5.8.0-rc6-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.5 D28704 1167 7389 0x00004004
Call Trace:
context_switch kernel/sched/core.c:3458 [inline]
__schedule+0x91f/0x2250 kernel/sched/core.c:4215
schedule+0xd0/0x2a0 kernel/sched/core.c:4290
schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:4349
__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: 0033:0x45c1f9
Code: Bad RIP value.
RSP: 002b:00007f092dcedc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 0000000000020ec0 RCX: 000000000045c1f9
RDX: 0000000000000000 RSI: 0000000020000180 RDI: ffffffffffffff9c
RBP: 000000000078bf48 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000078bf0c
R13: 0000000000c9fb6f R14: 00007f092dcee9c0 R15: 000000000078bf0c
Showing all locks held in the system:
1 lock held by khungtaskd/1156:
#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/6493:
#0: ffff88809a70a1b0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:826
2 locks held by agetty/6527:
#0: ffff8880a6713098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:267
#1: ffffc90000f902e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x223/0x1a30 drivers/tty/n_tty.c:2156
2 locks held by syz-executor.0/1134:
1 lock held by syz-executor.3/1140:
#0: ffff8880a3b44078 (&fb_info->lock){+.+.}-{3:3}, at: lock_fb_info include/linux/fb.h:637 [inline]
#0: ffff8880a3b44078 (&fb_info->lock){+.+.}-{3:3}, at: fb_open+0xd3/0x430 drivers/video/fbdev/core/fbmem.c:1418
1 lock held by syz-executor.5/1167:
#0: ffff8880a3b44078 (&fb_info->lock){+.+.}-{3:3}, at: lock_fb_info include/linux/fb.h:637 [inline]
#0: ffff8880a3b44078 (&fb_info->lock){+.+.}-{3:3}, at: fb_open+0xd3/0x430 drivers/video/fbdev/core/fbmem.c:1418
=============================================
NMI backtrace for cpu 0
CPU: 0 PID: 1156 Comm: khungtaskd Not tainted 5.8.0-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+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 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 1134 Comm: syz-executor.0 Not tainted 5.8.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:__readq arch/x86/include/asm/io.h:96 [inline]
RIP: 0010:bitfill_aligned drivers/video/fbdev/core/cfbfillrect.c:79 [inline]
RIP: 0010:bitfill_aligned+0x1b5/0x200 drivers/video/fbdev/core/cfbfillrect.c:35
Code: 8d b1 fd 83 fd ff 75 e0 4f 8d 6c fd 00 e8 83 90 b1 fd 31 ff 4c 89 f6 e8 19 8d b1 fd 4d 85 f6 0f 84 fa fe ff ff e8 6b 90 b1 fd <49> 8b 45 00 48 31 c3 49 21 de 49 31 c6 4d 89 75 00 e9 df fe ff ff
RSP: 0018:ffffc90005336fc8 EFLAGS: 00000246
RAX: 0000000000040000 RBX: 0000000000000000 RCX: ffffc90001b89000
RDX: 0000000000040000 RSI: ffffffff83c22c25 RDI: 0000000000000007
RBP: 00000000ffffffff R08: 0000000000001420 R09: 0000000000000040
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000050
R13: ffff8880000a0280 R14: 00000000ffffffff R15: 0000000000000000
FS: 00007fe28aa55700(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000c0114c40e0 CR3: 000000004ebd7000 CR4: 00000000001426e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
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
fbcon_switch+0x52c/0x16c0 drivers/video/fbdev/core/fbcon.c:2296
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:384
entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45c1f9
Code: Bad RIP value.
RSP: 002b:00007fe28aa54c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 000000000000d400 RCX: 000000000045c1f9
RDX: 0000000020000000 RSI: 0000000000004601 RDI: 0000000000000003
RBP: 000000000078bf40 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000078bf0c
R13: 0000000000c9fb6f R14: 00007fe28aa559c0 R15: 000000000078bf0c