INFO: task agetty:22272 blocked for more than 143 seconds.
Not tainted 5.15.0-rc6-next-20211021-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:agetty state:D stack:27784 pid:22272 ppid: 1 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:4965 [inline]
__schedule+0xa9a/0x4940 kernel/sched/core.c:6246
schedule+0xd2/0x260 kernel/sched/core.c:6319
schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6378
__mutex_lock_common kernel/locking/mutex.c:680 [inline]
__mutex_lock+0xa32/0x12f0 kernel/locking/mutex.c:740
tiocsti drivers/tty/tty_io.c:2308 [inline]
tty_ioctl+0x89f/0x1670 drivers/tty/tty_io.c:2719
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:874 [inline]
__se_sys_ioctl fs/ioctl.c:860 [inline]
__x64_sys_ioctl+0x193/0x200 fs/ioctl.c:860
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f5811554017
RSP: 002b:00007ffeb7b7fef8 EFLAGS: 00000206 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007ffeb7b80148 RCX: 00007f5811554017
RDX: 00007ffeb7b80147 RSI: 0000000000005412 RDI: 0000000000000000
RBP: 00007ffeb7b80180 R08: ffffffffffffff98 R09: 00007ffeb7b7ff70
R10: 0000000000000000 R11: 0000000000000206 R12: 00007ffeb7b7ff14
R13: 00007ffeb7b80070 R14: 00007ffeb7b7ff70 R15: 0000000000000000
INFO: task syz-executor.2:24117 can't die for more than 143 seconds.
task:syz-executor.2 state:R running task stack:26448 pid:24117 ppid: 17086 flags:0x00004006
Call Trace:
Showing all locks held in the system:
1 lock held by khungtaskd/27:
#0: ffffffff8bb833a0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6458
1 lock held by in:imklog/6248:
#0: ffff888072cd65f0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:990
2 locks held by kworker/u4:8/31413:
2 locks held by agetty/22272:
#0: ffff888079865098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:252
#1: ffff888010c790b8 (&buf->lock){+.+.}-{3:3}, at: tiocsti drivers/tty/tty_io.c:2308 [inline]
#1: ffff888010c790b8 (&buf->lock){+.+.}-{3:3}, at: tty_ioctl+0x89f/0x1670 drivers/tty/tty_io.c:2719
6 locks held by syz-executor.2/24117:
=============================================
NMI backtrace for cpu 1
CPU: 1 PID: 27 Comm: khungtaskd Not tainted 5.15.0-rc6-next-20211021-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
nmi_cpu_backtrace.cold+0x47/0x144 lib/nmi_backtrace.c:105
nmi_trigger_cpumask_backtrace+0x1ae/0x220 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:254 [inline]
watchdog+0xcb7/0xed0 kernel/hung_task.c:339
kthread+0x405/0x4f0 kernel/kthread.c:327
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 24117 Comm: syz-executor.2 Not tainted 5.15.0-rc6-next-20211021-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:slow_down_io arch/x86/include/asm/paravirt.h:55 [inline]
RIP: 0010:outb_p arch/x86/include/asm/io.h:334 [inline]
RIP: 0010:vga_io_w include/video/vga.h:209 [inline]
RIP: 0010:vga_io_rgfx include/video/vga.h:388 [inline]
RIP: 0010:setsr drivers/video/fbdev/vga16fb.c:160 [inline]
RIP: 0010:vga_8planes_imageblit drivers/video/fbdev/vga16fb.c:1142 [inline]
RIP: 0010:vga_imageblit_expand drivers/video/fbdev/vga16fb.c:1203 [inline]
RIP: 0010:vga16fb_imageblit+0x1cd3/0x2aa0 drivers/video/fbdev/vga16fb.c:1260
Code: 85 e5 06 00 00 48 83 3d 7a ea 79 07 00 0f 84 b0 05 00 00 e8 cf ed 51 fd e8 3a d1 0d fd 66 90 b8 01 00 00 00 ba ce 03 00 00 ee <48> b8 00 00 00 00 00 fc ff df 48 89 da 48 c1 ea 03 80 3c 02 00 0f
RSP: 0018:ffffc9000b71f0f8 EFLAGS: 00000246
RAX: 0000000000000001 RBX: ffffffff8b9f7560 RCX: ffffc9000f541000
RDX: 00000000000003ce RSI: ffffffff84258af1 RDI: 0000000000000003
RBP: ffffc9000b71f288 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff84258aa5 R11: 0000000000000001 R12: dffffc0000000000
R13: ffff8880000a09e0 R14: 0000000000000001 R15: ffff888017f3c000
FS: 00007f4e003e8700(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fb8ab005000 CR3: 0000000087cf5000 CR4: 00000000003506f0
Call Trace:
bit_putcs_unaligned drivers/video/fbdev/core/bitblit.c:124 [inline]
bit_putcs+0x6e1/0xd20 drivers/video/fbdev/core/bitblit.c:173
fbcon_putcs+0x353/0x440 drivers/video/fbdev/core/fbcon.c:1277
fbcon_redraw.constprop.0+0x41a/0x4b0 drivers/video/fbdev/core/fbcon.c:1435
fbcon_scroll+0x45c/0x610 drivers/video/fbdev/core/fbcon.c:1469
con_scroll+0x5b9/0x6d0 drivers/tty/vt/vt.c:630
lf+0x26b/0x2c0 drivers/tty/vt/vt.c:1507
vc_con_write_normal drivers/tty/vt/vt.c:2851 [inline]
do_con_write+0xf1c/0x1e40 drivers/tty/vt/vt.c:2955
con_put_char+0x70/0xa0 drivers/tty/vt/vt.c:3303
tty_put_char+0xb7/0x150 drivers/tty/tty_io.c:3173
__process_echoes+0x583/0x9f0 drivers/tty/n_tty.c:726
commit_echoes+0x148/0x210 drivers/tty/n_tty.c:791
n_tty_receive_char+0x3b0/0x5b0 drivers/tty/n_tty.c:1411
n_tty_receive_buf_standard drivers/tty/n_tty.c:1560 [inline]
__receive_buf drivers/tty/n_tty.c:1577 [inline]
n_tty_receive_buf_common+0x109e/0x4780 drivers/tty/n_tty.c:1674
tty_ldisc_receive_buf+0xa3/0x190 drivers/tty/tty_buffer.c:471
paste_selection+0x1de/0x4c0 drivers/tty/vt/selection.c:408
tioclinux+0x126/0x560 drivers/tty/vt/vt.c:3204
vt_ioctl+0x229a/0x2b10 drivers/tty/vt/vt_ioctl.c:762
tty_ioctl+0xbbd/0x1670 drivers/tty/tty_io.c:2805
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:874 [inline]
__se_sys_ioctl fs/ioctl.c:860 [inline]
__x64_sys_ioctl+0x193/0x200 fs/ioctl.c:860
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f4e02e72a39
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f4e003e8188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f4e02f75f60 RCX: 00007f4e02e72a39
RDX: 00000000200000c0 RSI: 000000000000541c RDI: 0000000000000006
RBP: 00007f4e02ecce8f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffc26e1ba0f R14: 00007f4e003e8300 R15: 0000000000022000
----------------
Code disassembly (best guess), 1 bytes skipped:
0: e5 06 in $0x6,%eax
2: 00 00 add %al,(%rax)
4: 48 83 3d 7a ea 79 07 cmpq $0x0,0x779ea7a(%rip) # 0x779ea86
b: 00
c: 0f 84 b0 05 00 00 je 0x5c2
12: e8 cf ed 51 fd callq 0xfd51ede6
17: e8 3a d1 0d fd callq 0xfd0dd156
1c: 66 90 xchg %ax,%ax
1e: b8 01 00 00 00 mov $0x1,%eax
23: ba ce 03 00 00 mov $0x3ce,%edx
28: ee out %al,(%dx)
* 29: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax <-- trapping instruction
30: fc ff df
33: 48 89 da mov %rbx,%rdx
36: 48 c1 ea 03 shr $0x3,%rdx
3a: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1)
3e: 0f .byte 0xf