INFO: task syz-executor.0:14885 can't die for more than 143 seconds. syz-executor.0 D28040 14885 9333 0x00004004 Call Trace: context_switch kernel/sched/core.c:3385 [inline] __schedule+0x934/0x1f90 kernel/sched/core.c:4081 schedule+0xdc/0x2b0 kernel/sched/core.c:4155 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:4214 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x7ab/0x13c0 kernel/locking/mutex.c:1103 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1118 lock_fb_info include/linux/fb.h:636 [inline] fb_release+0x55/0x150 drivers/video/fbdev/core/fbmem.c:1442 __fput+0x2ff/0x890 fs/file_table.c:280 ____fput+0x16/0x20 fs/file_table.c:313 task_work_run+0x145/0x1c0 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:188 [inline] exit_to_usermode_loop+0x316/0x380 arch/x86/entry/common.c:164 prepare_exit_to_usermode arch/x86/entry/common.c:195 [inline] syscall_return_slowpath arch/x86/entry/common.c:278 [inline] do_syscall_64+0x676/0x790 arch/x86/entry/common.c:304 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4144b1 Code: c9 4c 89 c9 49 89 f2 48 89 fe 4c 89 d7 e9 49 fb ff ff 4d 89 d1 eb ea 4d 89 d1 4d 89 ea e9 68 ff ff ff 4d 8d 51 03 49 c1 ea 02 <4d> 89 cb 49 83 e1 03 4e 8d 24 12 49 f7 c3 03 00 00 00 0f 84 d9 00 RSP: 002b:00007ffd5c34af30 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000005 RCX: 00000000004144b1 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004 RBP: 0000000000000001 R08: 0000000052f1a941 R09: 0000000052f1a945 R10: 00007ffd5c34b010 R11: 0000000000000293 R12: 000000000075c9a0 R13: 000000000075c9a0 R14: 0000000000761038 R15: 000000000075bf2c INFO: task syz-executor.0:14885 blocked for more than 143 seconds. Not tainted 5.5.0-rc2-next-20191220-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.0 D28040 14885 9333 0x00004004 Call Trace: context_switch kernel/sched/core.c:3385 [inline] __schedule+0x934/0x1f90 kernel/sched/core.c:4081 schedule+0xdc/0x2b0 kernel/sched/core.c:4155 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:4214 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x7ab/0x13c0 kernel/locking/mutex.c:1103 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1118 lock_fb_info include/linux/fb.h:636 [inline] fb_release+0x55/0x150 drivers/video/fbdev/core/fbmem.c:1442 __fput+0x2ff/0x890 fs/file_table.c:280 ____fput+0x16/0x20 fs/file_table.c:313 task_work_run+0x145/0x1c0 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:188 [inline] exit_to_usermode_loop+0x316/0x380 arch/x86/entry/common.c:164 prepare_exit_to_usermode arch/x86/entry/common.c:195 [inline] syscall_return_slowpath arch/x86/entry/common.c:278 [inline] do_syscall_64+0x676/0x790 arch/x86/entry/common.c:304 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4144b1 Code: c9 4c 89 c9 49 89 f2 48 89 fe 4c 89 d7 e9 49 fb ff ff 4d 89 d1 eb ea 4d 89 d1 4d 89 ea e9 68 ff ff ff 4d 8d 51 03 49 c1 ea 02 <4d> 89 cb 49 83 e1 03 4e 8d 24 12 49 f7 c3 03 00 00 00 0f 84 d9 00 RSP: 002b:00007ffd5c34af30 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000005 RCX: 00000000004144b1 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004 RBP: 0000000000000001 R08: 0000000052f1a941 R09: 0000000052f1a945 R10: 00007ffd5c34b010 R11: 0000000000000293 R12: 000000000075c9a0 R13: 000000000075c9a0 R14: 0000000000761038 R15: 000000000075bf2c INFO: task syz-executor.2:14903 can't die for more than 143 seconds. syz-executor.2 R running task 26984 14903 9338 0x00004006 Call Trace: mark_held_locks+0xa4/0xf0 kernel/locking/lockdep.c:3360 __trace_hardirqs_on_caller kernel/locking/lockdep.c:3389 [inline] lockdep_hardirqs_on+0x421/0x5e0 kernel/locking/lockdep.c:3434 trace_hardirqs_on_caller+0x6a/0x240 kernel/trace/trace_preemptirq.c:59 trace_hardirqs_on_thunk+0x1a/0x1c arch/x86/entry/thunk_64.S:41 retint_kernel+0x2b/0x2b RIP: a0000:0xffff888218c6c000 Code: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 <07> 00 00 00 00 00 00 00 00 20 09 00 ff ff ff ff 01 e1 4f 94 80 88 RSP: 4dcf528:00000000a45c2581 EFLAGS: a45c2581 ORIG_RAX: 0000000000000000 RAX: ffffc90004dcf4a8 RBX: 0000000000000000 RCX: ffffffff83b63528 RDX: 0000010000000000 RSI: 0000000000000000 RDI: ffffffffffffffff RBP: ffffc90004dcf528 R08: ffffffff81755726 R09: 0000000000000040 R10: ffffed104318c55b R11: ffff888218c62adf R12: ffff888218c6c000 R13: ffff8880000a0000 R14: 00000000a45c560c R15: 00000000a45c560c INFO: task syz-executor.2:14924 can't die for more than 143 seconds. syz-executor.2 D28376 14924 9338 0x00000004 Call Trace: context_switch kernel/sched/core.c:3385 [inline] __schedule+0x934/0x1f90 kernel/sched/core.c:4081 schedule+0xdc/0x2b0 kernel/sched/core.c:4155 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:4214 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x7ab/0x13c0 kernel/locking/mutex.c:1103 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1118 lock_fb_info include/linux/fb.h:636 [inline] fb_open+0xd7/0x450 drivers/video/fbdev/core/fbmem.c:1413 chrdev_open+0x245/0x6b0 fs/char_dev.c:414 do_dentry_open+0x4ca/0x1350 fs/open.c:797 vfs_open+0xa0/0xd0 fs/open.c:914 do_last fs/namei.c:3553 [inline] path_openat+0x12fd/0x34d0 fs/namei.c:3670 do_filp_open+0x192/0x260 fs/namei.c:3700 do_sys_openat2+0x633/0x840 fs/open.c:1152 do_sys_open+0xfc/0x190 fs/open.c:1168 __do_sys_openat fs/open.c:1182 [inline] __se_sys_openat fs/open.c:1177 [inline] __x64_sys_openat+0x9d/0x100 fs/open.c:1177 do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45a919 Code: 48 01 de 48 29 d9 e8 56 f8 ff ff 48 8b ac 24 00 80 00 00 48 81 c4 08 80 00 00 c3 e8 41 f6 ff ff e9 4c ff ff ff 48 8d bc 24 10 <80> 00 00 48 39 3b 75 8c 48 89 23 eb 87 cc cc cc cc cc cc cc cc cc RSP: 002b:00007fc2edbc4c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 000000000045a919 RDX: 0000000000000000 RSI: 0000000020000180 RDI: ffffffffffffff9c RBP: 000000000075c070 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fc2edbc56d4 R13: 00000000004c8067 R14: 00000000004df338 R15: 00000000ffffffff INFO: task syz-executor.2:14924 blocked for more than 143 seconds. Not tainted 5.5.0-rc2-next-20191220-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.2 D28376 14924 9338 0x00000004 Call Trace: context_switch kernel/sched/core.c:3385 [inline] __schedule+0x934/0x1f90 kernel/sched/core.c:4081 schedule+0xdc/0x2b0 kernel/sched/core.c:4155 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:4214 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x7ab/0x13c0 kernel/locking/mutex.c:1103 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1118 lock_fb_info include/linux/fb.h:636 [inline] fb_open+0xd7/0x450 drivers/video/fbdev/core/fbmem.c:1413 chrdev_open+0x245/0x6b0 fs/char_dev.c:414 do_dentry_open+0x4ca/0x1350 fs/open.c:797 vfs_open+0xa0/0xd0 fs/open.c:914 do_last fs/namei.c:3553 [inline] path_openat+0x12fd/0x34d0 fs/namei.c:3670 do_filp_open+0x192/0x260 fs/namei.c:3700 do_sys_openat2+0x633/0x840 fs/open.c:1152 do_sys_open+0xfc/0x190 fs/open.c:1168 __do_sys_openat fs/open.c:1182 [inline] __se_sys_openat fs/open.c:1177 [inline] __x64_sys_openat+0x9d/0x100 fs/open.c:1177 do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45a919 Code: 48 01 de 48 29 d9 e8 56 f8 ff ff 48 8b ac 24 00 80 00 00 48 81 c4 08 80 00 00 c3 e8 41 f6 ff ff e9 4c ff ff ff 48 8d bc 24 10 <80> 00 00 48 39 3b 75 8c 48 89 23 eb 87 cc cc cc cc cc cc cc cc cc RSP: 002b:00007fc2edbc4c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 000000000045a919 RDX: 0000000000000000 RSI: 0000000020000180 RDI: ffffffffffffff9c RBP: 000000000075c070 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fc2edbc56d4 R13: 00000000004c8067 R14: 00000000004df338 R15: 00000000ffffffff INFO: task syz-executor.3:14914 can't die for more than 143 seconds. syz-executor.3 D28280 14914 9340 0x00004004 Call Trace: context_switch kernel/sched/core.c:3385 [inline] __schedule+0x934/0x1f90 kernel/sched/core.c:4081 schedule+0xdc/0x2b0 kernel/sched/core.c:4155 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:4214 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x7ab/0x13c0 kernel/locking/mutex.c:1103 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1118 lock_fb_info include/linux/fb.h:636 [inline] fb_open+0xd7/0x450 drivers/video/fbdev/core/fbmem.c:1413 chrdev_open+0x245/0x6b0 fs/char_dev.c:414 do_dentry_open+0x4ca/0x1350 fs/open.c:797 vfs_open+0xa0/0xd0 fs/open.c:914 do_last fs/namei.c:3553 [inline] path_openat+0x12fd/0x34d0 fs/namei.c:3670 do_filp_open+0x192/0x260 fs/namei.c:3700 do_sys_openat2+0x633/0x840 fs/open.c:1152 do_sys_open+0xfc/0x190 fs/open.c:1168 __do_sys_openat fs/open.c:1182 [inline] __se_sys_openat fs/open.c:1177 [inline] __x64_sys_openat+0x9d/0x100 fs/open.c:1177 do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45a919 Code: 48 01 de 48 29 d9 e8 56 f8 ff ff 48 8b ac 24 00 80 00 00 48 81 c4 08 80 00 00 c3 e8 41 f6 ff ff e9 4c ff ff ff 48 8d bc 24 10 <80> 00 00 48 39 3b 75 8c 48 89 23 eb 87 cc cc cc cc cc cc cc cc cc RSP: 002b:00007f9b37748c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 000000000045a919 RDX: 0000000000000000 RSI: 0000000020000180 RDI: ffffffffffffff9c RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f9b377496d4 R13: 00000000004c8067 R14: 00000000004df338 R15: 00000000ffffffff INFO: task syz-executor.3:14914 blocked for more than 143 seconds. Not tainted 5.5.0-rc2-next-20191220-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.3 D28280 14914 9340 0x00004004 Call Trace: context_switch kernel/sched/core.c:3385 [inline] __schedule+0x934/0x1f90 kernel/sched/core.c:4081 schedule+0xdc/0x2b0 kernel/sched/core.c:4155 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:4214 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x7ab/0x13c0 kernel/locking/mutex.c:1103 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1118 lock_fb_info include/linux/fb.h:636 [inline] fb_open+0xd7/0x450 drivers/video/fbdev/core/fbmem.c:1413 chrdev_open+0x245/0x6b0 fs/char_dev.c:414 do_dentry_open+0x4ca/0x1350 fs/open.c:797 vfs_open+0xa0/0xd0 fs/open.c:914 do_last fs/namei.c:3553 [inline] path_openat+0x12fd/0x34d0 fs/namei.c:3670 do_filp_open+0x192/0x260 fs/namei.c:3700 do_sys_openat2+0x633/0x840 fs/open.c:1152 do_sys_open+0xfc/0x190 fs/open.c:1168 __do_sys_openat fs/open.c:1182 [inline] __se_sys_openat fs/open.c:1177 [inline] __x64_sys_openat+0x9d/0x100 fs/open.c:1177 do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45a919 Code: 48 01 de 48 29 d9 e8 56 f8 ff ff 48 8b ac 24 00 80 00 00 48 81 c4 08 80 00 00 c3 e8 41 f6 ff ff e9 4c ff ff ff 48 8d bc 24 10 <80> 00 00 48 39 3b 75 8c 48 89 23 eb 87 cc cc cc cc cc cc cc cc cc RSP: 002b:00007f9b37748c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 000000000045a919 RDX: 0000000000000000 RSI: 0000000020000180 RDI: ffffffffffffff9c RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f9b377496d4 R13: 00000000004c8067 R14: 00000000004df338 R15: 00000000ffffffff INFO: task syz-executor.4:14916 can't die for more than 143 seconds. syz-executor.4 D27416 14916 9343 0x00004004 Call Trace: context_switch kernel/sched/core.c:3385 [inline] __schedule+0x934/0x1f90 kernel/sched/core.c:4081 schedule+0xdc/0x2b0 kernel/sched/core.c:4155 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:4214 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x7ab/0x13c0 kernel/locking/mutex.c:1103 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1118 lock_fb_info include/linux/fb.h:636 [inline] fb_open+0xd7/0x450 drivers/video/fbdev/core/fbmem.c:1413 chrdev_open+0x245/0x6b0 fs/char_dev.c:414 do_dentry_open+0x4ca/0x1350 fs/open.c:797 vfs_open+0xa0/0xd0 fs/open.c:914 do_last fs/namei.c:3553 [inline] path_openat+0x12fd/0x34d0 fs/namei.c:3670 do_filp_open+0x192/0x260 fs/namei.c:3700 do_sys_openat2+0x633/0x840 fs/open.c:1152 do_sys_open+0xfc/0x190 fs/open.c:1168 __do_sys_openat fs/open.c:1182 [inline] __se_sys_openat fs/open.c:1177 [inline] __x64_sys_openat+0x9d/0x100 fs/open.c:1177 do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45a919 Code: 48 01 de 48 29 d9 e8 56 f8 ff ff 48 8b ac 24 00 80 00 00 48 81 c4 08 80 00 00 c3 e8 41 f6 ff ff e9 4c ff ff ff 48 8d bc 24 10 <80> 00 00 48 39 3b 75 8c 48 89 23 eb 87 cc cc cc cc cc cc cc cc cc RSP: 002b:00007f0ac952cc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 000000000045a919 RDX: 0000000000000000 RSI: 0000000020000180 RDI: ffffffffffffff9c RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f0ac952d6d4 R13: 00000000004c8067 R14: 00000000004df338 R15: 00000000ffffffff INFO: task syz-executor.4:14916 blocked for more than 143 seconds. Not tainted 5.5.0-rc2-next-20191220-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.4 D27416 14916 9343 0x00004004 Call Trace: context_switch kernel/sched/core.c:3385 [inline] __schedule+0x934/0x1f90 kernel/sched/core.c:4081 schedule+0xdc/0x2b0 kernel/sched/core.c:4155 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:4214 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x7ab/0x13c0 kernel/locking/mutex.c:1103 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1118 lock_fb_info include/linux/fb.h:636 [inline] fb_open+0xd7/0x450 drivers/video/fbdev/core/fbmem.c:1413 chrdev_open+0x245/0x6b0 fs/char_dev.c:414 do_dentry_open+0x4ca/0x1350 fs/open.c:797 vfs_open+0xa0/0xd0 fs/open.c:914 do_last fs/namei.c:3553 [inline] path_openat+0x12fd/0x34d0 fs/namei.c:3670 do_filp_open+0x192/0x260 fs/namei.c:3700 do_sys_openat2+0x633/0x840 fs/open.c:1152 do_sys_open+0xfc/0x190 fs/open.c:1168 __do_sys_openat fs/open.c:1182 [inline] __se_sys_openat fs/open.c:1177 [inline] __x64_sys_openat+0x9d/0x100 fs/open.c:1177 do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45a919 Code: Bad RIP value. RSP: 002b:00007f0ac952cc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 000000000045a919 RDX: 0000000000000000 RSI: 0000000020000180 RDI: ffffffffffffff9c RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f0ac952d6d4 R13: 00000000004c8067 R14: 00000000004df338 R15: 00000000ffffffff INFO: task syz-executor.5:14921 can't die for more than 143 seconds. syz-executor.5 D28376 14921 9346 0x00000004 Call Trace: context_switch kernel/sched/core.c:3385 [inline] __schedule+0x934/0x1f90 kernel/sched/core.c:4081 schedule+0xdc/0x2b0 kernel/sched/core.c:4155 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:4214 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x7ab/0x13c0 kernel/locking/mutex.c:1103 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1118 lock_fb_info include/linux/fb.h:636 [inline] fb_open+0xd7/0x450 drivers/video/fbdev/core/fbmem.c:1413 chrdev_open+0x245/0x6b0 fs/char_dev.c:414 do_dentry_open+0x4ca/0x1350 fs/open.c:797 vfs_open+0xa0/0xd0 fs/open.c:914 do_last fs/namei.c:3553 [inline] path_openat+0x12fd/0x34d0 fs/namei.c:3670 do_filp_open+0x192/0x260 fs/namei.c:3700 do_sys_openat2+0x633/0x840 fs/open.c:1152 do_sys_open+0xfc/0x190 fs/open.c:1168 __do_sys_openat fs/open.c:1182 [inline] __se_sys_openat fs/open.c:1177 [inline] __x64_sys_openat+0x9d/0x100 fs/open.c:1177 do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45a919 Code: Bad RIP value. RSP: 002b:00007f96384fbc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 000000000045a919 RDX: 0000000000000000 RSI: 0000000020000180 RDI: ffffffffffffff9c RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f96384fc6d4 R13: 00000000004c8067 R14: 00000000004df338 R15: 00000000ffffffff INFO: task syz-executor.5:14921 blocked for more than 143 seconds. Not tainted 5.5.0-rc2-next-20191220-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.5 D28376 14921 9346 0x00000004 Call Trace: context_switch kernel/sched/core.c:3385 [inline] __schedule+0x934/0x1f90 kernel/sched/core.c:4081 schedule+0xdc/0x2b0 kernel/sched/core.c:4155 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:4214 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x7ab/0x13c0 kernel/locking/mutex.c:1103 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1118 lock_fb_info include/linux/fb.h:636 [inline] fb_open+0xd7/0x450 drivers/video/fbdev/core/fbmem.c:1413 chrdev_open+0x245/0x6b0 fs/char_dev.c:414 do_dentry_open+0x4ca/0x1350 fs/open.c:797 vfs_open+0xa0/0xd0 fs/open.c:914 do_last fs/namei.c:3553 [inline] path_openat+0x12fd/0x34d0 fs/namei.c:3670 do_filp_open+0x192/0x260 fs/namei.c:3700 do_sys_openat2+0x633/0x840 fs/open.c:1152 do_sys_open+0xfc/0x190 fs/open.c:1168 __do_sys_openat fs/open.c:1182 [inline] __se_sys_openat fs/open.c:1177 [inline] __x64_sys_openat+0x9d/0x100 fs/open.c:1177 do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45a919 Code: Bad RIP value. RSP: 002b:00007f96384fbc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 000000000045a919 RDX: 0000000000000000 RSI: 0000000020000180 RDI: ffffffffffffff9c RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f96384fc6d4 R13: 00000000004c8067 R14: 00000000004df338 R15: 00000000ffffffff INFO: task syz-executor.1:14926 can't die for more than 143 seconds. syz-executor.1 D28376 14926 9336 0x00004004 Call Trace: context_switch kernel/sched/core.c:3385 [inline] __schedule+0x934/0x1f90 kernel/sched/core.c:4081 schedule+0xdc/0x2b0 kernel/sched/core.c:4155 schedule_timeout+0x72b/0xc60 kernel/time/timer.c:1871 __down_common kernel/locking/semaphore.c:220 [inline] __down+0x176/0x2c0 kernel/locking/semaphore.c:237 down+0x64/0x90 kernel/locking/semaphore.c:61 console_lock+0x29/0x80 kernel/printk/printk.c:2289 vcs_open+0x67/0xd0 drivers/tty/vt/vc_screen.c:688 chrdev_open+0x245/0x6b0 fs/char_dev.c:414 do_dentry_open+0x4ca/0x1350 fs/open.c:797 vfs_open+0xa0/0xd0 fs/open.c:914 do_last fs/namei.c:3553 [inline] path_openat+0x12fd/0x34d0 fs/namei.c:3670 do_filp_open+0x192/0x260 fs/namei.c:3700 do_sys_openat2+0x633/0x840 fs/open.c:1152 do_sys_open+0xfc/0x190 fs/open.c:1168 __do_sys_openat fs/open.c:1182 [inline] __se_sys_openat fs/open.c:1177 [inline] __x64_sys_openat+0x9d/0x100 fs/open.c:1177 do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45a919 Code: Bad RIP value. RSP: 002b:00007f2351df9c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 000000000045a919 RDX: 0000000000000000 RSI: 00000000200001c0 RDI: ffffffffffffff9c RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f2351dfa6d4 R13: 00000000004c86f4 R14: 00000000004dfc50 R15: 00000000ffffffff INFO: task syz-executor.1:14926 blocked for more than 143 seconds. Not tainted 5.5.0-rc2-next-20191220-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.1 D28376 14926 9336 0x00004004 Call Trace: context_switch kernel/sched/core.c:3385 [inline] __schedule+0x934/0x1f90 kernel/sched/core.c:4081 schedule+0xdc/0x2b0 kernel/sched/core.c:4155 schedule_timeout+0x72b/0xc60 kernel/time/timer.c:1871 __down_common kernel/locking/semaphore.c:220 [inline] __down+0x176/0x2c0 kernel/locking/semaphore.c:237 down+0x64/0x90 kernel/locking/semaphore.c:61 console_lock+0x29/0x80 kernel/printk/printk.c:2289 vcs_open+0x67/0xd0 drivers/tty/vt/vc_screen.c:688 chrdev_open+0x245/0x6b0 fs/char_dev.c:414 do_dentry_open+0x4ca/0x1350 fs/open.c:797 vfs_open+0xa0/0xd0 fs/open.c:914 do_last fs/namei.c:3553 [inline] path_openat+0x12fd/0x34d0 fs/namei.c:3670 do_filp_open+0x192/0x260 fs/namei.c:3700 do_sys_openat2+0x633/0x840 fs/open.c:1152 do_sys_open+0xfc/0x190 fs/open.c:1168 __do_sys_openat fs/open.c:1182 [inline] __se_sys_openat fs/open.c:1177 [inline] __x64_sys_openat+0x9d/0x100 fs/open.c:1177 do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45a919 Code: Bad RIP value. RSP: 002b:00007f2351df9c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 000000000045a919 RDX: 0000000000000000 RSI: 00000000200001c0 RDI: ffffffffffffff9c RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f2351dfa6d4 R13: 00000000004c86f4 R14: 00000000004dfc50 R15: 00000000ffffffff INFO: task syz-executor.1:14927 can't die for more than 143 seconds. syz-executor.1 D27792 14927 9336 0x00000004 Call Trace: context_switch kernel/sched/core.c:3385 [inline] __schedule+0x934/0x1f90 kernel/sched/core.c:4081 schedule+0xdc/0x2b0 kernel/sched/core.c:4155 schedule_timeout+0x72b/0xc60 kernel/time/timer.c:1871 __down_common kernel/locking/semaphore.c:220 [inline] __down+0x176/0x2c0 kernel/locking/semaphore.c:237 down+0x64/0x90 kernel/locking/semaphore.c:61 console_lock+0x29/0x80 kernel/printk/printk.c:2289 vcs_open+0x67/0xd0 drivers/tty/vt/vc_screen.c:688 chrdev_open+0x245/0x6b0 fs/char_dev.c:414 do_dentry_open+0x4ca/0x1350 fs/open.c:797 vfs_open+0xa0/0xd0 fs/open.c:914 do_last fs/namei.c:3553 [inline] path_openat+0x12fd/0x34d0 fs/namei.c:3670 do_filp_open+0x192/0x260 fs/namei.c:3700 do_sys_openat2+0x633/0x840 fs/open.c:1152 do_sys_open+0xfc/0x190 fs/open.c:1168 __do_sys_openat fs/open.c:1182 [inline] __se_sys_openat fs/open.c:1177 [inline] __x64_sys_openat+0x9d/0x100 fs/open.c:1177 do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45a919 Code: Bad RIP value. RSP: 002b:00007f2351dd8c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 000000000045a919 RDX: 0000000000000000 RSI: 00000000200001c0 RDI: ffffffffffffff9c RBP: 000000000075bfc8 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f2351dd96d4 R13: 00000000004c86f4 R14: 00000000004dfc50 R15: 00000000ffffffff INFO: task syz-executor.1:14927 blocked for more than 143 seconds. Not tainted 5.5.0-rc2-next-20191220-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.1 D27792 14927 9336 0x00000004 Call Trace: context_switch kernel/sched/core.c:3385 [inline] __schedule+0x934/0x1f90 kernel/sched/core.c:4081 schedule+0xdc/0x2b0 kernel/sched/core.c:4155 schedule_timeout+0x72b/0xc60 kernel/time/timer.c:1871 __down_common kernel/locking/semaphore.c:220 [inline] __down+0x176/0x2c0 kernel/locking/semaphore.c:237 down+0x64/0x90 kernel/locking/semaphore.c:61 console_lock+0x29/0x80 kernel/printk/printk.c:2289 vcs_open+0x67/0xd0 drivers/tty/vt/vc_screen.c:688 chrdev_open+0x245/0x6b0 fs/char_dev.c:414 do_dentry_open+0x4ca/0x1350 fs/open.c:797 vfs_open+0xa0/0xd0 fs/open.c:914 do_last fs/namei.c:3553 [inline] path_openat+0x12fd/0x34d0 fs/namei.c:3670 do_filp_open+0x192/0x260 fs/namei.c:3700 do_sys_openat2+0x633/0x840 fs/open.c:1152 do_sys_open+0xfc/0x190 fs/open.c:1168 __do_sys_openat fs/open.c:1182 [inline] __se_sys_openat fs/open.c:1177 [inline] __x64_sys_openat+0x9d/0x100 fs/open.c:1177 do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45a919 Code: Bad RIP value. RSP: 002b:00007f2351dd8c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 000000000045a919 RDX: 0000000000000000 RSI: 00000000200001c0 RDI: ffffffffffffff9c RBP: 000000000075bfc8 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f2351dd96d4 R13: 00000000004c86f4 R14: 00000000004dfc50 R15: 00000000ffffffff Showing all locks held in the system: 1 lock held by khungtaskd/1115: #0: ffffffff899af980 (rcu_read_lock){....}, at: debug_show_all_locks+0x5f/0x279 kernel/locking/lockdep.c:5334 1 lock held by rsyslogd/9204: #0: ffff8880a8de7de0 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xee/0x110 fs/file.c:803 2 locks held by getty/9294: #0: ffff88809a8ab090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340 #1: ffffc9000173b2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 drivers/tty/n_tty.c:2156 2 locks held by getty/9295: #0: ffff888094c54090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340 #1: ffffc9000172b2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 drivers/tty/n_tty.c:2156 2 locks held by getty/9296: #0: ffff8880a7495090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340 #1: ffffc9000177b2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 drivers/tty/n_tty.c:2156 2 locks held by getty/9297: #0: ffff888094345090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340 #1: ffffc900017ab2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 drivers/tty/n_tty.c:2156 2 locks held by getty/9298: #0: ffff8880a499e090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340 #1: ffffc900017bb2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 drivers/tty/n_tty.c:2156 2 locks held by getty/9299: #0: ffff8880a4620090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340 #1: ffffc9000179b2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 drivers/tty/n_tty.c:2156 2 locks held by getty/9300: #0: ffff8880a00de090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340 #1: ffffc900011342e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 drivers/tty/n_tty.c:2156 1 lock held by syz-executor.0/14885: #0: ffff888218c6c070 (&fb_info->lock){+.+.}, at: lock_fb_info include/linux/fb.h:636 [inline] #0: ffff888218c6c070 (&fb_info->lock){+.+.}, at: fb_release+0x55/0x150 drivers/video/fbdev/core/fbmem.c:1442 2 locks held by syz-executor.2/14903: 1 lock held by syz-executor.2/14924: #0: ffff888218c6c070 (&fb_info->lock){+.+.}, at: lock_fb_info include/linux/fb.h:636 [inline] #0: ffff888218c6c070 (&fb_info->lock){+.+.}, at: fb_open+0xd7/0x450 drivers/video/fbdev/core/fbmem.c:1413 1 lock held by syz-executor.3/14914: #0: ffff888218c6c070 (&fb_info->lock){+.+.}, at: lock_fb_info include/linux/fb.h:636 [inline] #0: ffff888218c6c070 (&fb_info->lock){+.+.}, at: fb_open+0xd7/0x450 drivers/video/fbdev/core/fbmem.c:1413 1 lock held by syz-executor.4/14916: #0: ffff888218c6c070 (&fb_info->lock){+.+.}, at: lock_fb_info include/linux/fb.h:636 [inline] #0: ffff888218c6c070 (&fb_info->lock){+.+.}, at: fb_open+0xd7/0x450 drivers/video/fbdev/core/fbmem.c:1413 1 lock held by syz-executor.5/14921: #0: ffff888218c6c070 (&fb_info->lock){+.+.}, at: lock_fb_info include/linux/fb.h:636 [inline] #0: ffff888218c6c070 (&fb_info->lock){+.+.}, at: fb_open+0xd7/0x450 drivers/video/fbdev/core/fbmem.c:1413 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1115 Comm: khungtaskd Not tainted 5.5.0-rc2-next-20191220-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+0x197/0x210 lib/dump_stack.c:118 nmi_cpu_backtrace.cold+0x70/0xb2 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x23b/0x28b lib/nmi_backtrace.c:62 arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:249 [inline] watchdog+0xdf1/0x14e0 kernel/hung_task.c:333 kthread+0x361/0x430 kernel/kthread.c:255 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: 14903 Comm: syz-executor.2 Not tainted 5.5.0-rc2-next-20191220-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:62 [inline] RIP: 0010:bitfill_aligned+0xeb/0x210 drivers/video/fbdev/core/cfbfillrect.c:35 Code: e8 4a 21 bf fd 31 ff 44 89 fe e8 c0 22 bf fd 45 85 ff 0f 85 ff 00 00 00 e8 32 21 bf fd 44 89 e0 31 d2 bf 07 00 00 00 41 f7 f5 <41> 89 c4 89 c6 41 89 c5 e8 98 22 bf fd 41 83 fc 07 76 5f 4d 89 f7 RSP: 0018:ffffc90004dcf468 EFLAGS: 00000246 RAX: 0000000000000004 RBX: 0000000000000000 RCX: ffffc9000d9dd000 RDX: 0000000000000000 RSI: ffffffff83b6345e RDI: 0000000000000007 RBP: ffffc90004dcf4a8 R08: ffff8880944fe100 R09: 0000000000000040 R10: ffffed104318c55b R11: ffff888218c62adf R12: 0000000000000100 R13: 0000000000000040 R14: ffff8880000a0000 R15: 0000000000000000 FS: 00007fc2edc07700(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f7f61bdd000 CR3: 0000000096a35000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: cfb_fillrect+0x423/0x7c0 drivers/video/fbdev/core/cfbfillrect.c:327 vga16fb_fillrect+0x6ce/0x19b0 drivers/video/fbdev/vga16fb.c:951 bit_clear_margins+0x30b/0x530 drivers/video/fbdev/core/bitblit.c:232 fbcon_clear_margins+0x1e9/0x250 drivers/video/fbdev/core/fbcon.c:1372 fbcon_switch+0xd7f/0x17f0 drivers/video/fbdev/core/fbcon.c:2354 redraw_screen+0x2b6/0x7d0 drivers/tty/vt/vt.c:997 fbcon_modechanged+0x5c3/0x790 drivers/video/fbdev/core/fbcon.c:2991 fbcon_update_vcs+0x42/0x50 drivers/video/fbdev/core/fbcon.c:3038 fb_set_var+0xb32/0xdd0 drivers/video/fbdev/core/fbmem.c:1051 do_fb_ioctl+0x390/0x7d0 drivers/video/fbdev/core/fbmem.c:1104 fb_ioctl+0xe6/0x130 drivers/video/fbdev/core/fbmem.c:1180 vfs_ioctl fs/ioctl.c:47 [inline] ksys_ioctl+0x123/0x180 fs/ioctl.c:747 __do_sys_ioctl fs/ioctl.c:756 [inline] __se_sys_ioctl fs/ioctl.c:754 [inline] __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:754 do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45a919 Code: ad b6 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 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fc2edc06c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045a919 RDX: 0000000020000000 RSI: 0000000000004601 RDI: 0000000000000005 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fc2edc076d4 R13: 00000000004c310d R14: 00000000004d8498 R15: 00000000ffffffff