INFO: task syz-executor410:6832 blocked for more than 143 seconds. Not tainted 5.8.0-rc3-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor410 D28544 6832 6830 0x00004004 Call Trace: context_switch kernel/sched/core.c:3453 [inline] __schedule+0x7d3/0xc40 kernel/sched/core.c:4178 INFO: task syz-executor410:6833 blocked for more than 143 seconds. Not tainted 5.8.0-rc3-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor410 D28496 6833 6828 0x00004004 Call Trace: context_switch kernel/sched/core.c:3453 [inline] __schedule+0x7d3/0xc40 kernel/sched/core.c:4178 INFO: task syz-executor410:6834 blocked for more than 143 seconds. Not tainted 5.8.0-rc3-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor410 D27600 6834 6826 0x00004004 Call Trace: context_switch kernel/sched/core.c:3453 [inline] __schedule+0x7d3/0xc40 kernel/sched/core.c:4178 INFO: task syz-executor410:6835 blocked for more than 143 seconds. Not tainted 5.8.0-rc3-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor410 D27664 6835 6829 0x00004004 Call Trace: context_switch kernel/sched/core.c:3453 [inline] __schedule+0x7d3/0xc40 kernel/sched/core.c:4178 INFO: task syz-executor410:6836 blocked for more than 143 seconds. Not tainted 5.8.0-rc3-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor410 D27776 6836 6831 0x00004004 Call Trace: context_switch kernel/sched/core.c:3453 [inline] __schedule+0x7d3/0xc40 kernel/sched/core.c:4178 Showing all locks held in the system: 1 lock held by khungtaskd/1147: #0: ffffffff892e9490 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30 arch/x86/pci/mmconfig_64.c:151 1 lock held by in:imklog/6509: #0: ffff88809df40930 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x253/0x2f0 fs/file.c:826 2 locks held by syz-executor410/6827: 1 lock held by syz-executor410/6832: #0: ffff8880a386f078 (&fb_info->lock){+.+.}-{3:3}, at: lock_fb_info include/linux/fb.h:637 [inline] #0: ffff8880a386f078 (&fb_info->lock){+.+.}-{3:3}, at: fb_open+0x14b/0x3b0 drivers/video/fbdev/core/fbmem.c:1418 1 lock held by syz-executor410/6833: #0: ffff8880a386f078 (&fb_info->lock){+.+.}-{3:3}, at: lock_fb_info include/linux/fb.h:637 [inline] #0: ffff8880a386f078 (&fb_info->lock){+.+.}-{3:3}, at: fb_open+0x14b/0x3b0 drivers/video/fbdev/core/fbmem.c:1418 1 lock held by syz-executor410/6834: #0: ffff8880a386f078 (&fb_info->lock){+.+.}-{3:3}, at: lock_fb_info include/linux/fb.h:637 [inline] #0: ffff8880a386f078 (&fb_info->lock){+.+.}-{3:3}, at: fb_open+0x14b/0x3b0 drivers/video/fbdev/core/fbmem.c:1418 1 lock held by syz-executor410/6835: #0: ffff8880a386f078 (&fb_info->lock){+.+.}-{3:3}, at: lock_fb_info include/linux/fb.h:637 [inline] #0: ffff8880a386f078 (&fb_info->lock){+.+.}-{3:3}, at: fb_open+0x14b/0x3b0 drivers/video/fbdev/core/fbmem.c:1418 1 lock held by syz-executor410/6836: #0: ffff8880a386f078 (&fb_info->lock){+.+.}-{3:3}, at: lock_fb_info include/linux/fb.h:637 [inline] #0: ffff8880a386f078 (&fb_info->lock){+.+.}-{3:3}, at: fb_open+0x14b/0x3b0 drivers/video/fbdev/core/fbmem.c:1418 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1147 Comm: khungtaskd Not tainted 5.8.0-rc3-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+0x1f0/0x31e lib/dump_stack.c:118 nmi_cpu_backtrace+0x9f/0x180 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x16a/0x280 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+0xd65/0xdb0 kernel/hung_task.c:295 kthread+0x37e/0x3a0 drivers/block/aoe/aoecmd.c:1234 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: 6827 Comm: syz-executor410 Not tainted 5.8.0-rc3-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:bitfill_aligned+0x118/0x1f0 drivers/video/fbdev/core/cfbfillrect.c:62 Code: 24 10 48 8b 03 49 31 c6 49 21 ee 49 31 c6 4c 89 33 e9 da 00 00 00 e8 27 67 a2 fd 44 8b 24 24 48 8b 44 24 18 31 d2 f7 74 24 04 <89> c5 bf 07 00 00 00 89 c6 e8 1a 6b a2 fd 83 fd 07 76 3b 4c 8b 7c RSP: 0018:ffffc90000f87908 EFLAGS: 00000246 RAX: 0000000000000028 RBX: ffff8880000a0000 RCX: ffff8880939cc240 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: ffffffff83d21478 R09: 0000000000000040 R10: 0000000000000002 R11: ffff8880939cc240 R12: 0000000000000000 R13: ffffffffffffffff R14: 0000000000000000 R15: 00000000000009c0 FS: 000000000161c880(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020000180 CR3: 00000000a003d000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: cfb_fillrect+0x57b/0x790 drivers/video/fbdev/core/cfbfillrect.c:327 bit_clear_margins+0x37b/0x620 drivers/video/fbdev/core/bitblit.c:232 fbcon_clear_margins drivers/video/fbdev/core/fbcon.c:1381 [inline] fbcon_switch+0x1448/0x1e40 drivers/video/fbdev/core/fbcon.c:2363 redraw_screen+0x4fc/0x16f0 drivers/tty/vt/vt.c:1015 fbcon_modechanged+0x8d5/0xd90 drivers/video/fbdev/core/fbcon.c:3001 fb_set_var+0x825/0xcc0 drivers/video/fbdev/core/fbmem.c:1056 do_fb_ioctl+0x502/0x6f0 drivers/video/fbdev/core/fbmem.c:1109 vfs_ioctl fs/ioctl.c:48 [inline] ksys_ioctl fs/ioctl.c:753 [inline] __do_sys_ioctl fs/ioctl.c:762 [inline] __se_sys_ioctl+0xf9/0x160 fs/ioctl.c:760 do_syscall_64+0x73/0xe0 arch/x86/entry/common.c:359 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x441459 Code: Bad RIP value. RSP: 002b:00007fff244019e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000441459 RDX: 0000000020000000 RSI: 0000000000004601 RDI: 0000000000000003 RBP: 00000000006cb018 R08: 00000000004002c8 R09: 00000000004002c8 R10: 0000000000000004 R11: 0000000000000246 R12: 00000000004021d0 R13: 0000000000402260 R14: 0000000000000000 R15: 0000000000000000