INFO: task syz-executor.2:10292 can't die for more than 143 seconds. syz-executor.2 R running task 26216 10292 7415 0x00004006 Call Trace: preempt_schedule_irq+0xb0/0x150 kernel/sched/core.c:4346 retint_kernel+0x1b/0x2b RIP: 0010:bitfill_aligned+0x12/0x200 drivers/video/fbdev/core/cfbfillrect.c:37 Code: e9 54 fa ff ff e8 8e 31 f1 fd e9 ed fc ff ff 66 0f 1f 84 00 00 00 00 00 41 57 41 89 d7 41 56 41 55 49 89 f5 41 54 45 89 c4 55 <44> 89 cd 53 48 89 cb 48 83 ec 10 e8 8e 10 b3 fd 31 ff 44 89 e6 e8 RSP: 0018:ffffc900050674f0 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: ffffffff83c023e0 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffff8880000a0000 RDI: ffff888218f9a000 RBP: ffff888218f9a000 R08: 0000000000001400 R09: 0000000000000040 R10: ffff888218f8961f R11: ffffed10431f12c3 R12: 0000000000001400 R13: ffff8880000a0000 R14: 00000000e353248c R15: 0000000000000000 cfb_fillrect+0x418/0x7a0 drivers/video/fbdev/core/cfbfillrect.c:327 vga16fb_fillrect+0x68f/0x1960 drivers/video/fbdev/vga16fb.c:951 bit_clear_margins+0x2d5/0x4a0 drivers/video/fbdev/core/bitblit.c:232 fbcon_clear_margins+0x1de/0x240 drivers/video/fbdev/core/fbcon.c:1381 fbcon_switch+0xd21/0x1740 drivers/video/fbdev/core/fbcon.c:2363 redraw_screen+0x2ae/0x770 drivers/tty/vt/vt.c:1009 fbcon_modechanged+0x5c3/0x790 drivers/video/fbdev/core/fbcon.c:3000 fbcon_update_vcs+0x3a/0x50 drivers/video/fbdev/core/fbcon.c:3047 fb_set_var+0xad0/0xd40 drivers/video/fbdev/core/fbmem.c:1056 do_fb_ioctl+0x390/0x6e0 drivers/video/fbdev/core/fbmem.c:1109 fb_ioctl+0xdd/0x130 drivers/video/fbdev/core/fbmem.c:1185 vfs_ioctl fs/ioctl.c:47 [inline] ksys_ioctl+0x11a/0x180 fs/ioctl.c:763 __do_sys_ioctl fs/ioctl.c:772 [inline] __se_sys_ioctl fs/ioctl.c:770 [inline] __x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:770 do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xb3 RIP: 0033:0x45c829 Code: Bad RIP value. RSP: 002b:00007f9629c17c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00000000004e46c0 RCX: 000000000045c829 RDX: 0000000020000000 RSI: 0000000000004601 RDI: 0000000000000004 RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000000002f0 R14: 00000000004c5497 R15: 00007f9629c186d4 INFO: task syz-executor.0:10313 blocked for more than 143 seconds. Not tainted 5.7.0-rc1-next-20200415-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.0 D28400 10313 7220 0x00000004 Call Trace: schedule+0xd0/0x2a0 kernel/sched/core.c:4163 schedule_timeout+0x55b/0x850 kernel/time/timer.c:1874 __down_common kernel/locking/semaphore.c:220 [inline] __down+0x176/0x2c0 kernel/locking/semaphore.c:237 down+0x57/0x80 kernel/locking/semaphore.c:61 console_lock+0x25/0x80 kernel/printk/printk.c:2318 vcs_open+0x62/0xc0 drivers/tty/vt/vc_screen.c:688 chrdev_open+0x219/0x5c0 fs/char_dev.c:414 do_dentry_open+0x4b6/0x12a0 fs/open.c:797 do_open fs/namei.c:3229 [inline] path_openat+0x1e70/0x27f0 fs/namei.c:3346 do_filp_open+0x192/0x260 fs/namei.c:3373 do_sys_openat2+0x585/0x7d0 fs/open.c:1148 do_sys_open+0xc3/0x140 fs/open.c:1164 do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xb3 RIP: 0033:0x45c829 Code: Bad RIP value. RSP: 002b:00007fa6037a3c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00000000004f8b80 RCX: 000000000045c829 RDX: 0000000000000000 RSI: 0000000020000140 RDI: ffffffffffffff9c RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000803 R14: 00000000004cabd9 R15: 00007fa6037a46d4 Showing all locks held in the system: 2 locks held by kworker/u4:2/41: 4 locks held by kworker/u4:4/157: 1 lock held by khungtaskd/1171: #0: ffffffff899befc0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:5754 1 lock held by in:imklog/6909: #0: ffff8880a6a5ddf0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:826 2 locks held by syz-executor.2/10292: ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1171 Comm: khungtaskd Not tainted 5.7.0-rc1-next-20200415-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+0x188/0x20d lib/dump_stack.c:118 nmi_cpu_backtrace.cold+0x70/0xb1 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x231/0x27e lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:147 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:249 [inline] watchdog+0xde3/0x14e0 kernel/hung_task.c:333 kthread+0x388/0x470 kernel/kthread.c:268 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 41 Comm: kworker/u4:2 Not tainted 5.7.0-rc1-next-20200415-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: bat_events batadv_tt_purge RIP: 0010:lockdep_softirqs_off+0xee/0x360 kernel/locking/lockdep.c:3793 Code: 28 02 00 00 8b 3d c2 50 0f 0b 85 ff 0f 84 f6 00 00 00 48 8d bb b0 08 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6 04 02 84 c0 74 08 3c 03 0f 8e de 01 00 00 8b 8b b0 08 00 00 RSP: 0018:ffffc90000eb7c60 EFLAGS: 00000802 RAX: dffffc0000000000 RBX: ffff8880a9120440 RCX: 1ffffffff18d222c RDX: 1ffff1101522419e RSI: 0000000000000201 RDI: ffff8880a9120cf0 RBP: ffffffff87bf0b7d R08: 0000000000000000 R09: 0000000000000001 R10: ffffffff8c313adf R11: fffffbfff186275b R12: ffff8880a9120440 R13: ffff888088981140 R14: ffff8880a3d09180 R15: 0000000000000045 FS: 0000000000000000(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f84218f9fe8 CR3: 0000000095c45000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __local_bh_disable_ip+0xf0/0x190 kernel/softirq.c:129 __raw_spin_lock_bh include/linux/spinlock_api_smp.h:134 [inline] _raw_spin_lock_bh+0x13/0x40 kernel/locking/spinlock.c:175 spin_lock_bh include/linux/spinlock.h:358 [inline] batadv_tt_global_purge net/batman-adv/translation-table.c:2511 [inline] batadv_tt_purge+0x10d/0xa30 net/batman-adv/translation-table.c:3802 process_one_work+0x965/0x16a0 kernel/workqueue.c:2268 worker_thread+0x96/0xe20 kernel/workqueue.c:2414 kthread+0x388/0x470 kernel/kthread.c:268 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352