INFO: task syz-executor.2:8419 can't die for more than 143 seconds. syz-executor.2 D28272 8419 7138 0x00004004 Call Trace: context_switch kernel/sched/core.c:3430 [inline] __schedule+0x8f3/0x1f80 kernel/sched/core.c:4155 schedule+0xd0/0x2a0 kernel/sched/core.c:4230 schedule_timeout+0x454/0x850 kernel/time/timer.c:1873 __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:2331 con_install+0x8b/0x610 drivers/tty/vt/vt.c:3252 tty_driver_install_tty drivers/tty/tty_io.c:1228 [inline] tty_init_dev drivers/tty/tty_io.c:1341 [inline] tty_init_dev+0xf5/0x460 drivers/tty/tty_io.c:1318 tty_open_by_driver drivers/tty/tty_io.c:1983 [inline] tty_open+0x48b/0xb40 drivers/tty/tty_io.c:2031 chrdev_open+0x219/0x5c0 fs/char_dev.c:414 do_dentry_open+0x4b6/0x11a0 fs/open.c:822 do_open fs/namei.c:3234 [inline] path_openat+0x1e9e/0x27d0 fs/namei.c:3351 do_filp_open+0x192/0x260 fs/namei.c:3378 do_sys_openat2+0x585/0x7a0 fs/open.c:1173 do_sys_open+0xc3/0x140 fs/open.c:1189 do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:359 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x416851 Code: 00 00 00 e8 61 00 00 00 48 8b 44 24 20 48 8b 4c 24 38 48 8b 54 24 30 0f b6 14 0a 80 fa a1 75 13 89 44 24 60 48 89 4c 24 68 48 <8b> 6c 24 40 48 83 c4 48 c3 48 8d 05 34 92 58 00 48 89 04 24 48 c7 RSP: 002b:00007f1e6528b7a0 EFLAGS: 00000293 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 000000000050a680 RCX: 0000000000416851 RDX: 0000000000000000 RSI: 0000000000000002 RDI: 00007f1e6528b7d0 RBP: 000000000078bfa0 R08: 0000000000000000 R09: 000000000000000e R10: 0000000000000064 R11: 0000000000000293 R12: 00000000ffffffff R13: 0000000000000c4c R14: 00000000004cea33 R15: 00007f1e6528c6d4 INFO: task syz-executor.2:8419 blocked for more than 143 seconds. Not tainted 5.7.0-rc7-next-20200529-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.2 D28272 8419 7138 0x00004004 Call Trace: context_switch kernel/sched/core.c:3430 [inline] __schedule+0x8f3/0x1f80 kernel/sched/core.c:4155 schedule+0xd0/0x2a0 kernel/sched/core.c:4230 schedule_timeout+0x454/0x850 kernel/time/timer.c:1873 __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:2331 con_install+0x8b/0x610 drivers/tty/vt/vt.c:3252 tty_driver_install_tty drivers/tty/tty_io.c:1228 [inline] tty_init_dev drivers/tty/tty_io.c:1341 [inline] tty_init_dev+0xf5/0x460 drivers/tty/tty_io.c:1318 tty_open_by_driver drivers/tty/tty_io.c:1983 [inline] tty_open+0x48b/0xb40 drivers/tty/tty_io.c:2031 chrdev_open+0x219/0x5c0 fs/char_dev.c:414 do_dentry_open+0x4b6/0x11a0 fs/open.c:822 do_open fs/namei.c:3234 [inline] path_openat+0x1e9e/0x27d0 fs/namei.c:3351 do_filp_open+0x192/0x260 fs/namei.c:3378 do_sys_openat2+0x585/0x7a0 fs/open.c:1173 do_sys_open+0xc3/0x140 fs/open.c:1189 do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:359 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x416851 Code: 00 00 00 e8 61 00 00 00 48 8b 44 24 20 48 8b 4c 24 38 48 8b 54 24 30 0f b6 14 0a 80 fa a1 75 13 89 44 24 60 48 89 4c 24 68 48 <8b> 6c 24 40 48 83 c4 48 c3 48 8d 05 34 92 58 00 48 89 04 24 48 c7 RSP: 002b:00007f1e6528b7a0 EFLAGS: 00000293 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 000000000050a680 RCX: 0000000000416851 RDX: 0000000000000000 RSI: 0000000000000002 RDI: 00007f1e6528b7d0 RBP: 000000000078bfa0 R08: 0000000000000000 R09: 000000000000000e R10: 0000000000000064 R11: 0000000000000293 R12: 00000000ffffffff R13: 0000000000000c4c R14: 00000000004cea33 R15: 00007f1e6528c6d4 INFO: task syz-executor.4:8417 can't die for more than 143 seconds. syz-executor.4 R running task 22112 8417 7226 0x00004006 Call Trace: INFO: task syz-executor.4:8435 can't die for more than 143 seconds. syz-executor.4 D28520 8435 7226 0x00000004 Call Trace: context_switch kernel/sched/core.c:3430 [inline] __schedule+0x8f3/0x1f80 kernel/sched/core.c:4155 schedule+0xd0/0x2a0 kernel/sched/core.c:4230 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:4289 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x7b3/0x13c0 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+0x219/0x5c0 fs/char_dev.c:414 do_dentry_open+0x4b6/0x11a0 fs/open.c:822 do_open fs/namei.c:3234 [inline] path_openat+0x1e9e/0x27d0 fs/namei.c:3351 do_filp_open+0x192/0x260 fs/namei.c:3378 do_sys_openat2+0x585/0x7a0 fs/open.c:1173 do_sys_open+0xc3/0x140 fs/open.c:1189 do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:359 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45ca59 Code: 48 8d 3d e2 b7 28 01 e8 c5 22 00 00 e9 18 ff ff ff 48 8d 3d c9 b7 28 01 e8 b4 22 00 00 e9 ec fe ff ff e8 aa 04 00 00 e9 85 fe ff cc cc cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 RSP: 002b:00007f1ecc143c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00000000004f8340 RCX: 000000000045ca59 RDX: 0000000000000000 RSI: 0000000020000040 RDI: ffffffffffffff9c RBP: 000000000078bfa0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000000007bf R14: 00000000004ca9ed R15: 00007f1ecc1446d4 INFO: task syz-executor.4:8435 blocked for more than 143 seconds. Not tainted 5.7.0-rc7-next-20200529-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.4 D28520 8435 7226 0x00000004 Call Trace: context_switch kernel/sched/core.c:3430 [inline] __schedule+0x8f3/0x1f80 kernel/sched/core.c:4155 schedule+0xd0/0x2a0 kernel/sched/core.c:4230 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:4289 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x7b3/0x13c0 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+0x219/0x5c0 fs/char_dev.c:414 do_dentry_open+0x4b6/0x11a0 fs/open.c:822 do_open fs/namei.c:3234 [inline] path_openat+0x1e9e/0x27d0 fs/namei.c:3351 do_filp_open+0x192/0x260 fs/namei.c:3378 do_sys_openat2+0x585/0x7a0 fs/open.c:1173 do_sys_open+0xc3/0x140 fs/open.c:1189 do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:359 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45ca59 Code: 48 8d 3d e2 b7 28 01 e8 c5 22 00 00 e9 18 ff ff ff 48 8d 3d c9 b7 28 01 e8 b4 22 00 00 e9 ec fe ff ff e8 aa 04 00 00 e9 85 fe ff cc cc cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 RSP: 002b:00007f1ecc143c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00000000004f8340 RCX: 000000000045ca59 RDX: 0000000000000000 RSI: 0000000020000040 RDI: ffffffffffffff9c RBP: 000000000078bfa0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000000007bf R14: 00000000004ca9ed R15: 00007f1ecc1446d4 INFO: task syz-executor.0:8430 can't die for more than 143 seconds. syz-executor.0 D25976 8430 6888 0x00000004 Call Trace: context_switch kernel/sched/core.c:3430 [inline] __schedule+0x8f3/0x1f80 kernel/sched/core.c:4155 schedule+0xd0/0x2a0 kernel/sched/core.c:4230 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:4289 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x7b3/0x13c0 kernel/locking/mutex.c:1103 tty_open_by_driver drivers/tty/tty_io.c:1947 [inline] tty_open+0x3ae/0xb40 drivers/tty/tty_io.c:2031 chrdev_open+0x219/0x5c0 fs/char_dev.c:414 do_dentry_open+0x4b6/0x11a0 fs/open.c:822 do_open fs/namei.c:3234 [inline] path_openat+0x1e9e/0x27d0 fs/namei.c:3351 do_filp_open+0x192/0x260 fs/namei.c:3378 do_sys_openat2+0x585/0x7a0 fs/open.c:1173 do_sys_open+0xc3/0x140 fs/open.c:1189 do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:359 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x416851 Code: 00 00 00 e8 61 00 00 00 48 8b 44 24 20 48 8b 4c 24 38 48 8b 54 24 30 0f b6 14 0a 80 fa a1 75 13 89 44 24 60 48 89 4c 24 68 48 <8b> 6c 24 40 48 83 c4 48 c3 48 8d 05 34 92 58 00 48 89 04 24 48 c7 RSP: 002b:00007fb06e2a47a0 EFLAGS: 00000293 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 000000000050a640 RCX: 0000000000416851 RDX: 0000000000000000 RSI: 0000000000000002 RDI: 00007fb06e2a47d0 RBP: 000000000078bf00 R08: 0000000000000000 R09: 000000000000000d R10: 0000000000000064 R11: 0000000000000293 R12: 00000000ffffffff R13: 0000000000000c4b R14: 00000000004cea21 R15: 00007fb06e2a56d4 INFO: task syz-executor.0:8430 blocked for more than 143 seconds. Not tainted 5.7.0-rc7-next-20200529-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.0 D25976 8430 6888 0x00000004 Call Trace: context_switch kernel/sched/core.c:3430 [inline] __schedule+0x8f3/0x1f80 kernel/sched/core.c:4155 schedule+0xd0/0x2a0 kernel/sched/core.c:4230 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:4289 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x7b3/0x13c0 kernel/locking/mutex.c:1103 tty_open_by_driver drivers/tty/tty_io.c:1947 [inline] tty_open+0x3ae/0xb40 drivers/tty/tty_io.c:2031 chrdev_open+0x219/0x5c0 fs/char_dev.c:414 do_dentry_open+0x4b6/0x11a0 fs/open.c:822 do_open fs/namei.c:3234 [inline] path_openat+0x1e9e/0x27d0 fs/namei.c:3351 do_filp_open+0x192/0x260 fs/namei.c:3378 do_sys_openat2+0x585/0x7a0 fs/open.c:1173 do_sys_open+0xc3/0x140 fs/open.c:1189 do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:359 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x416851 Code: 00 00 00 e8 61 00 00 00 48 8b 44 24 20 48 8b 4c 24 38 48 8b 54 24 30 0f b6 14 0a 80 fa a1 75 13 89 44 24 60 48 89 4c 24 68 48 <8b> 6c 24 40 48 83 c4 48 c3 48 8d 05 34 92 58 00 48 89 04 24 48 c7 RSP: 002b:00007fb06e2a47a0 EFLAGS: 00000293 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 000000000050a640 RCX: 0000000000416851 RDX: 0000000000000000 RSI: 0000000000000002 RDI: 00007fb06e2a47d0 RBP: 000000000078bf00 R08: 0000000000000000 R09: 000000000000000d R10: 0000000000000064 R11: 0000000000000293 R12: 00000000ffffffff R13: 0000000000000c4b R14: 00000000004cea21 R15: 00007fb06e2a56d4 Showing all locks held in the system: 1 lock held by khungtaskd/1140: #0: ffffffff89bbde00 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:5779 1 lock held by in:imklog/6552: #0: ffff888092e9e1b0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:826 2 locks held by syz-executor.2/8419: #0: ffffffff8a16ddc8 (tty_mutex){+.+.}-{3:3}, at: tty_open_by_driver drivers/tty/tty_io.c:1947 [inline] #0: ffffffff8a16ddc8 (tty_mutex){+.+.}-{3:3}, at: tty_open+0x3ae/0xb40 drivers/tty/tty_io.c:2031 #1: ffff8880a64e31c0 (&tty->legacy_mutex){+.+.}-{3:3}, at: tty_lock+0xbd/0x120 drivers/tty/tty_mutex.c:19 2 locks held by syz-executor.4/8417: 1 lock held by syz-executor.4/8435: #0: ffff888218875078 (&fb_info->lock){+.+.}-{3:3}, at: lock_fb_info include/linux/fb.h:637 [inline] #0: ffff888218875078 (&fb_info->lock){+.+.}-{3:3}, at: fb_open+0xd3/0x430 drivers/video/fbdev/core/fbmem.c:1418 1 lock held by syz-executor.0/8430: #0: ffffffff8a16ddc8 (tty_mutex){+.+.}-{3:3}, at: tty_open_by_driver drivers/tty/tty_io.c:1947 [inline] #0: ffffffff8a16ddc8 (tty_mutex){+.+.}-{3:3}, at: tty_open+0x3ae/0xb40 drivers/tty/tty_io.c:2031 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1140 Comm: khungtaskd Not tainted 5.7.0-rc7-next-20200529-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+0x1e6/0x221 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:147 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:253 [inline] watchdog+0xf97/0x14e0 kernel/hung_task.c:339 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: 8417 Comm: syz-executor.4 Not tainted 5.7.0-rc7-next-20200529-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:bitfill_aligned drivers/video/fbdev/core/cfbfillrect.c:74 [inline] RIP: 0010:bitfill_aligned+0x158/0x200 drivers/video/fbdev/core/cfbfillrect.c:35 Code: fe e8 0c 00 af fd 41 83 ff 07 77 bd 41 8d 44 24 f8 44 89 e5 c1 e8 03 83 e5 07 48 83 c0 01 48 c1 e0 06 49 01 c5 e8 48 fe ae fd <44> 8d 7d ff 31 ff 89 ee e8 db ff ae fd 85 ed 74 2b 44 89 fd 4d 89 RSP: 0018:ffffc90018816fd0 EFLAGS: 00000246 RAX: 0000000000040000 RBX: 0000000000000000 RCX: ffffc90012126000 RDX: 0000000000040000 RSI: ffffffff83c3fd58 RDI: 0000000000000005 RBP: 0000000000000000 R08: ffff8880a67d4540 R09: 0000000000000040 R10: ffff888218839a5f R11: ffffed104310734b R12: 0000000000000050 R13: ffff8880000a0280 R14: 0000000000000000 R15: 0000000000000000 FS: 00007f1ecc165700(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f1948933000 CR3: 00000000a29ba000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: 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+0xcde/0x16f0 drivers/video/fbdev/core/fbcon.c:2363 redraw_screen+0x2ae/0x770 drivers/tty/vt/vt.c:1015 fbcon_modechanged+0x581/0x720 drivers/video/fbdev/core/fbcon.c:3000 fbcon_update_vcs+0x3a/0x50 drivers/video/fbdev/core/fbcon.c:3047 fb_set_var+0xb03/0xd90 drivers/video/fbdev/core/fbmem.c:1056 fbcon_switch+0x52a/0x16f0 drivers/video/fbdev/core/fbcon.c:2296 redraw_screen+0x2ae/0x770 drivers/tty/vt/vt.c:1015 fbcon_modechanged+0x581/0x720 drivers/video/fbdev/core/fbcon.c:3000 fbcon_update_vcs+0x3a/0x50 drivers/video/fbdev/core/fbcon.c:3047 fb_set_var+0xb03/0xd90 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: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:359 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45ca59 Code: 0d b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 0f 83 db b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f1ecc164c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00000000004e5240 RCX: 000000000045ca59 RDX: 0000000020000080 RSI: 0000000000004601 RDI: 0000000000000003 RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000000002fb R14: 00000000004c5797 R15: 00007f1ecc1656d4