INFO: task syz-executor.5:27316 blocked for more than 143 seconds. Not tainted 5.8.0-rc5-next-20200714-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.5 D28160 27316 7345 0x80004006 Call Trace: context_switch kernel/sched/core.c:3445 [inline] __schedule+0x8b4/0x1e80 kernel/sched/core.c:4169 schedule+0xd0/0x2a0 kernel/sched/core.c:4244 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:4303 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x3e2/0x10d0 kernel/locking/mutex.c:1103 tty_release_struct+0xa9/0xe0 drivers/tty/tty_io.c:1624 tty_release+0xc67/0xf60 drivers/tty/tty_io.c:1785 __fput+0x33c/0x880 fs/file_table.c:281 task_work_run+0xdd/0x190 kernel/task_work.c:135 exit_task_work include/linux/task_work.h:25 [inline] do_exit+0xb7d/0x29f0 kernel/exit.c:806 do_group_exit+0x125/0x310 kernel/exit.c:903 get_signal+0x40b/0x1ee0 kernel/signal.c:2743 do_signal+0x82/0x2520 arch/x86/kernel/signal.c:810 exit_to_usermode_loop arch/x86/entry/common.c:235 [inline] __prepare_exit_to_usermode+0x14d/0x1f0 arch/x86/entry/common.c:269 do_syscall_64+0x6c/0xe0 arch/x86/entry/common.c:393 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45cba9 Code: Bad RIP value. RSP: 002b:00007f573d5a4cf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 000000000078c048 RCX: 000000000045cba9 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 000000000078c048 RBP: 000000000078c040 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000078c04c R13: 00007ffc908e2f2f R14: 00007f573d5a59c0 R15: 000000000078c04c INFO: task syz-executor.1:27430 can't die for more than 143 seconds. syz-executor.1 D28184 27430 6982 0x00004006 Call Trace: context_switch kernel/sched/core.c:3445 [inline] __schedule+0x8b4/0x1e80 kernel/sched/core.c:4169 schedule+0xd0/0x2a0 kernel/sched/core.c:4244 schedule_timeout+0x1d8/0x250 kernel/time/timer.c:1873 __down_common kernel/locking/semaphore.c:220 [inline] __down+0x183/0x2a0 kernel/locking/semaphore.c:237 down+0x57/0x80 kernel/locking/semaphore.c:61 console_lock+0x25/0x80 kernel/printk/printk.c:2357 con_shutdown+0x3d/0x90 drivers/tty/vt/vt.c:3386 release_tty+0xcb/0x570 drivers/tty/tty_io.c:1514 tty_release_struct+0xb4/0xe0 drivers/tty/tty_io.c:1625 tty_release+0xc67/0xf60 drivers/tty/tty_io.c:1785 __fput+0x33c/0x880 fs/file_table.c:281 task_work_run+0xdd/0x190 kernel/task_work.c:135 get_signal+0xd6c/0x1ee0 kernel/signal.c:2547 do_signal+0x82/0x2520 arch/x86/kernel/signal.c:810 exit_to_usermode_loop arch/x86/entry/common.c:235 [inline] __prepare_exit_to_usermode+0x14d/0x1f0 arch/x86/entry/common.c:269 do_syscall_64+0x6c/0xe0 arch/x86/entry/common.c:393 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45cba9 Code: Bad RIP value. RSP: 002b:00007f1c92832c78 EFLAGS: 00000246 ORIG_RAX: 000000000000010e RAX: fffffffffffffdfe RBX: 00000000004fc9e0 RCX: 000000000045cba9 RDX: 0000000000000000 RSI: 00000000200000c0 RDI: 0000000000000040 RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000020000140 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000000008ad R14: 00000000004cb9de R15: 00007f1c928336d4 INFO: task syz-executor.1:27430 blocked for more than 143 seconds. Not tainted 5.8.0-rc5-next-20200714-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.1 D28184 27430 6982 0x00004006 Call Trace: context_switch kernel/sched/core.c:3445 [inline] __schedule+0x8b4/0x1e80 kernel/sched/core.c:4169 schedule+0xd0/0x2a0 kernel/sched/core.c:4244 schedule_timeout+0x1d8/0x250 kernel/time/timer.c:1873 __down_common kernel/locking/semaphore.c:220 [inline] __down+0x183/0x2a0 kernel/locking/semaphore.c:237 down+0x57/0x80 kernel/locking/semaphore.c:61 console_lock+0x25/0x80 kernel/printk/printk.c:2357 con_shutdown+0x3d/0x90 drivers/tty/vt/vt.c:3386 release_tty+0xcb/0x570 drivers/tty/tty_io.c:1514 tty_release_struct+0xb4/0xe0 drivers/tty/tty_io.c:1625 tty_release+0xc67/0xf60 drivers/tty/tty_io.c:1785 __fput+0x33c/0x880 fs/file_table.c:281 task_work_run+0xdd/0x190 kernel/task_work.c:135 get_signal+0xd6c/0x1ee0 kernel/signal.c:2547 do_signal+0x82/0x2520 arch/x86/kernel/signal.c:810 exit_to_usermode_loop arch/x86/entry/common.c:235 [inline] __prepare_exit_to_usermode+0x14d/0x1f0 arch/x86/entry/common.c:269 do_syscall_64+0x6c/0xe0 arch/x86/entry/common.c:393 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45cba9 Code: Bad RIP value. RSP: 002b:00007f1c92832c78 EFLAGS: 00000246 ORIG_RAX: 000000000000010e RAX: fffffffffffffdfe RBX: 00000000004fc9e0 RCX: 000000000045cba9 RDX: 0000000000000000 RSI: 00000000200000c0 RDI: 0000000000000040 RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000020000140 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000000008ad R14: 00000000004cb9de R15: 00007f1c928336d4 INFO: task syz-executor.1:27435 can't die for more than 143 seconds. syz-executor.1 D28728 27435 6982 0x00000004 Call Trace: context_switch kernel/sched/core.c:3445 [inline] __schedule+0x8b4/0x1e80 kernel/sched/core.c:4169 schedule+0xd0/0x2a0 kernel/sched/core.c:4244 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:4303 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x3e2/0x10d0 kernel/locking/mutex.c:1103 ptmx_open drivers/tty/pty.c:844 [inline] ptmx_open+0x103/0x360 drivers/tty/pty.c:811 chrdev_open+0x266/0x770 fs/char_dev.c:414 do_dentry_open+0x4b9/0x11b0 fs/open.c:822 do_open fs/namei.c:3249 [inline] path_openat+0x1bb9/0x2750 fs/namei.c:3366 do_filp_open+0x17e/0x3c0 fs/namei.c:3393 do_sys_openat2+0x16f/0x3b0 fs/open.c:1173 do_sys_open fs/open.c:1189 [inline] __do_sys_openat fs/open.c:1203 [inline] __se_sys_openat fs/open.c:1198 [inline] __x64_sys_openat+0x13f/0x1f0 fs/open.c:1198 do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:384 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45cba9 Code: Bad RIP value. RSP: 002b:00007f1c92811c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00000000004f9fa0 RCX: 000000000045cba9 RDX: 0000000000000000 RSI: 0000000020000080 RDI: ffffffffffffff9c RBP: 000000000078bfa0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000804 R14: 00000000004cae4e R15: 00007f1c928126d4 INFO: task syz-executor.1:27435 blocked for more than 143 seconds. Not tainted 5.8.0-rc5-next-20200714-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.1 D28728 27435 6982 0x00000004 Call Trace: context_switch kernel/sched/core.c:3445 [inline] __schedule+0x8b4/0x1e80 kernel/sched/core.c:4169 schedule+0xd0/0x2a0 kernel/sched/core.c:4244 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:4303 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x3e2/0x10d0 kernel/locking/mutex.c:1103 ptmx_open drivers/tty/pty.c:844 [inline] ptmx_open+0x103/0x360 drivers/tty/pty.c:811 chrdev_open+0x266/0x770 fs/char_dev.c:414 do_dentry_open+0x4b9/0x11b0 fs/open.c:822 do_open fs/namei.c:3249 [inline] path_openat+0x1bb9/0x2750 fs/namei.c:3366 do_filp_open+0x17e/0x3c0 fs/namei.c:3393 do_sys_openat2+0x16f/0x3b0 fs/open.c:1173 do_sys_open fs/open.c:1189 [inline] __do_sys_openat fs/open.c:1203 [inline] __se_sys_openat fs/open.c:1198 [inline] __x64_sys_openat+0x13f/0x1f0 fs/open.c:1198 do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:384 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45cba9 Code: Bad RIP value. RSP: 002b:00007f1c92811c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00000000004f9fa0 RCX: 000000000045cba9 RDX: 0000000000000000 RSI: 0000000020000080 RDI: ffffffffffffff9c RBP: 000000000078bfa0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000804 R14: 00000000004cae4e R15: 00007f1c928126d4 INFO: task syz-executor.1:27457 can't die for more than 143 seconds. syz-executor.1 D28728 27457 6982 0x00004004 Call Trace: context_switch kernel/sched/core.c:3445 [inline] __schedule+0x8b4/0x1e80 kernel/sched/core.c:4169 schedule+0xd0/0x2a0 kernel/sched/core.c:4244 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:4303 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x3e2/0x10d0 kernel/locking/mutex.c:1103 tty_open_by_driver drivers/tty/tty_io.c:1947 [inline] tty_open+0x51d/0xf60 drivers/tty/tty_io.c:2031 chrdev_open+0x266/0x770 fs/char_dev.c:414 do_dentry_open+0x4b9/0x11b0 fs/open.c:822 do_open fs/namei.c:3249 [inline] path_openat+0x1bb9/0x2750 fs/namei.c:3366 do_filp_open+0x17e/0x3c0 fs/namei.c:3393 do_sys_openat2+0x16f/0x3b0 fs/open.c:1173 do_sys_open fs/open.c:1189 [inline] ksys_open include/linux/syscalls.h:1398 [inline] __do_sys_open fs/open.c:1195 [inline] __se_sys_open fs/open.c:1193 [inline] __x64_sys_open+0x119/0x1c0 fs/open.c:1193 do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:384 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x416921 Code: Bad RIP value. RSP: 002b:00007f1c927f07a0 EFLAGS: 00000293 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 000000000050c3a0 RCX: 0000000000416921 RDX: 0000000000000000 RSI: 0000000000000002 RDI: 00007f1c927f07d0 RBP: 000000000078c040 R08: 0000000000000000 R09: 000000000000000e R10: 0000000000000064 R11: 0000000000000293 R12: 00000000ffffffff R13: 0000000000000c94 R14: 00000000004cee36 R15: 00007f1c927f16d4 INFO: task syz-executor.1:27457 blocked for more than 143 seconds. Not tainted 5.8.0-rc5-next-20200714-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.1 D28728 27457 6982 0x00004004 Call Trace: context_switch kernel/sched/core.c:3445 [inline] __schedule+0x8b4/0x1e80 kernel/sched/core.c:4169 schedule+0xd0/0x2a0 kernel/sched/core.c:4244 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:4303 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x3e2/0x10d0 kernel/locking/mutex.c:1103 tty_open_by_driver drivers/tty/tty_io.c:1947 [inline] tty_open+0x51d/0xf60 drivers/tty/tty_io.c:2031 chrdev_open+0x266/0x770 fs/char_dev.c:414 do_dentry_open+0x4b9/0x11b0 fs/open.c:822 do_open fs/namei.c:3249 [inline] path_openat+0x1bb9/0x2750 fs/namei.c:3366 do_filp_open+0x17e/0x3c0 fs/namei.c:3393 do_sys_openat2+0x16f/0x3b0 fs/open.c:1173 do_sys_open fs/open.c:1189 [inline] ksys_open include/linux/syscalls.h:1398 [inline] __do_sys_open fs/open.c:1195 [inline] __se_sys_open fs/open.c:1193 [inline] __x64_sys_open+0x119/0x1c0 fs/open.c:1193 do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:384 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x416921 Code: Bad RIP value. RSP: 002b:00007f1c927f07a0 EFLAGS: 00000293 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 000000000050c3a0 RCX: 0000000000416921 RDX: 0000000000000000 RSI: 0000000000000002 RDI: 00007f1c927f07d0 RBP: 000000000078c040 R08: 0000000000000000 R09: 000000000000000e R10: 0000000000000064 R11: 0000000000000293 R12: 00000000ffffffff R13: 0000000000000c94 R14: 00000000004cee36 R15: 00007f1c927f16d4 INFO: task syz-executor.1:27458 can't die for more than 143 seconds. syz-executor.1 D28728 27458 6982 0x00004004 Call Trace: context_switch kernel/sched/core.c:3445 [inline] __schedule+0x8b4/0x1e80 kernel/sched/core.c:4169 schedule+0xd0/0x2a0 kernel/sched/core.c:4244 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:4303 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x3e2/0x10d0 kernel/locking/mutex.c:1103 tty_open_by_driver drivers/tty/tty_io.c:1947 [inline] tty_open+0x51d/0xf60 drivers/tty/tty_io.c:2031 chrdev_open+0x266/0x770 fs/char_dev.c:414 do_dentry_open+0x4b9/0x11b0 fs/open.c:822 do_open fs/namei.c:3249 [inline] path_openat+0x1bb9/0x2750 fs/namei.c:3366 do_filp_open+0x17e/0x3c0 fs/namei.c:3393 do_sys_openat2+0x16f/0x3b0 fs/open.c:1173 do_sys_open fs/open.c:1189 [inline] __do_sys_openat fs/open.c:1203 [inline] __se_sys_openat fs/open.c:1198 [inline] __x64_sys_openat+0x13f/0x1f0 fs/open.c:1198 do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:384 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45cba9 Code: Bad RIP value. RSP: 002b:00007f1c927cfc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00000000004faf20 RCX: 000000000045cba9 RDX: 0000000000000000 RSI: 0000000020000040 RDI: ffffffffffffff9c RBP: 000000000078c0e0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000842 R14: 00000000004cb2fb R15: 00007f1c927d06d4 INFO: task syz-executor.1:27458 blocked for more than 143 seconds. Not tainted 5.8.0-rc5-next-20200714-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.1 D28728 27458 6982 0x00004004 Call Trace: context_switch kernel/sched/core.c:3445 [inline] __schedule+0x8b4/0x1e80 kernel/sched/core.c:4169 schedule+0xd0/0x2a0 kernel/sched/core.c:4244 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:4303 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x3e2/0x10d0 kernel/locking/mutex.c:1103 tty_open_by_driver drivers/tty/tty_io.c:1947 [inline] tty_open+0x51d/0xf60 drivers/tty/tty_io.c:2031 chrdev_open+0x266/0x770 fs/char_dev.c:414 do_dentry_open+0x4b9/0x11b0 fs/open.c:822 do_open fs/namei.c:3249 [inline] path_openat+0x1bb9/0x2750 fs/namei.c:3366 do_filp_open+0x17e/0x3c0 fs/namei.c:3393 do_sys_openat2+0x16f/0x3b0 fs/open.c:1173 do_sys_open fs/open.c:1189 [inline] __do_sys_openat fs/open.c:1203 [inline] __se_sys_openat fs/open.c:1198 [inline] __x64_sys_openat+0x13f/0x1f0 fs/open.c:1198 do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:384 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45cba9 Code: Bad RIP value. RSP: 002b:00007f1c927cfc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00000000004faf20 RCX: 000000000045cba9 RDX: 0000000000000000 RSI: 0000000020000040 RDI: ffffffffffffff9c RBP: 000000000078c0e0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000842 R14: 00000000004cb2fb R15: 00007f1c927d06d4 INFO: task syz-executor.5:27444 can't die for more than 143 seconds. syz-executor.5 R running task 26960 27444 7345 0x00004006 Call Trace: INFO: task syz-executor.5:27448 can't die for more than 143 seconds. syz-executor.5 D28728 27448 7345 0x00000004 Call Trace: context_switch kernel/sched/core.c:3445 [inline] __schedule+0x8b4/0x1e80 kernel/sched/core.c:4169 schedule+0xd0/0x2a0 kernel/sched/core.c:4244 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:4303 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x3e2/0x10d0 kernel/locking/mutex.c:1103 lock_fb_info include/linux/fb.h:638 [inline] fb_open+0xd3/0x430 drivers/video/fbdev/core/fbmem.c:1418 chrdev_open+0x266/0x770 fs/char_dev.c:414 do_dentry_open+0x4b9/0x11b0 fs/open.c:822 do_open fs/namei.c:3249 [inline] path_openat+0x1bb9/0x2750 fs/namei.c:3366 do_filp_open+0x17e/0x3c0 fs/namei.c:3393 do_sys_openat2+0x16f/0x3b0 fs/open.c:1173 do_sys_open fs/open.c:1189 [inline] __do_sys_openat fs/open.c:1203 [inline] __se_sys_openat fs/open.c:1198 [inline] __x64_sys_openat+0x13f/0x1f0 fs/open.c:1198 do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:384 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45cba9 Code: Bad RIP value. RSP: 002b:00007f573d5c5c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00000000004f9760 RCX: 000000000045cba9 RDX: 0000000000000000 RSI: 0000000020000180 RDI: ffffffffffffff9c RBP: 000000000078bfa0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000000007e3 R14: 00000000004cac7f R15: 00007f573d5c66d4 INFO: task syz-executor.5:27448 blocked for more than 143 seconds. Not tainted 5.8.0-rc5-next-20200714-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.5 D28728 27448 7345 0x00000004 Call Trace: context_switch kernel/sched/core.c:3445 [inline] __schedule+0x8b4/0x1e80 kernel/sched/core.c:4169 schedule+0xd0/0x2a0 kernel/sched/core.c:4244 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:4303 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x3e2/0x10d0 kernel/locking/mutex.c:1103 lock_fb_info include/linux/fb.h:638 [inline] fb_open+0xd3/0x430 drivers/video/fbdev/core/fbmem.c:1418 chrdev_open+0x266/0x770 fs/char_dev.c:414 do_dentry_open+0x4b9/0x11b0 fs/open.c:822 do_open fs/namei.c:3249 [inline] path_openat+0x1bb9/0x2750 fs/namei.c:3366 do_filp_open+0x17e/0x3c0 fs/namei.c:3393 do_sys_openat2+0x16f/0x3b0 fs/open.c:1173 do_sys_open fs/open.c:1189 [inline] __do_sys_openat fs/open.c:1203 [inline] __se_sys_openat fs/open.c:1198 [inline] __x64_sys_openat+0x13f/0x1f0 fs/open.c:1198 do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:384 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45cba9 Code: Bad RIP value. RSP: 002b:00007f573d5c5c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00000000004f9760 RCX: 000000000045cba9 RDX: 0000000000000000 RSI: 0000000020000180 RDI: ffffffffffffff9c RBP: 000000000078bfa0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000000007e3 R14: 00000000004cac7f R15: 00007f573d5c66d4 Showing all locks held in the system: 2 locks held by kworker/u4:0/7: 1 lock held by khungtaskd/1163: #0: ffffffff89c53980 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:5779 2 locks held by systemd-journal/3900: 2 locks held by in:imklog/6518: 4 locks held by rs:main Q:Reg/6519: 1 lock held by syz-executor.5/27316: #0: ffffffff8a20d7c8 (tty_mutex){+.+.}-{3:3}, at: tty_release_struct+0xa9/0xe0 drivers/tty/tty_io.c:1624 1 lock held by syz-executor.1/27430: #0: ffffffff8a20d7c8 (tty_mutex){+.+.}-{3:3}, at: tty_release_struct+0xa9/0xe0 drivers/tty/tty_io.c:1624 1 lock held by syz-executor.1/27435: #0: ffffffff8a20d7c8 (tty_mutex){+.+.}-{3:3}, at: ptmx_open drivers/tty/pty.c:844 [inline] #0: ffffffff8a20d7c8 (tty_mutex){+.+.}-{3:3}, at: ptmx_open+0x103/0x360 drivers/tty/pty.c:811 1 lock held by syz-executor.1/27457: #0: ffffffff8a20d7c8 (tty_mutex){+.+.}-{3:3}, at: tty_open_by_driver drivers/tty/tty_io.c:1947 [inline] #0: ffffffff8a20d7c8 (tty_mutex){+.+.}-{3:3}, at: tty_open+0x51d/0xf60 drivers/tty/tty_io.c:2031 1 lock held by syz-executor.1/27458: #0: ffffffff8a20d7c8 (tty_mutex){+.+.}-{3:3}, at: tty_open_by_driver drivers/tty/tty_io.c:1947 [inline] #0: ffffffff8a20d7c8 (tty_mutex){+.+.}-{3:3}, at: tty_open+0x51d/0xf60 drivers/tty/tty_io.c:2031 2 locks held by syz-executor.5/27444: 1 lock held by syz-executor.5/27448: #0: ffff888218897078 (&fb_info->lock){+.+.}-{3:3}, at: lock_fb_info include/linux/fb.h:638 [inline] #0: ffff888218897078 (&fb_info->lock){+.+.}-{3:3}, at: fb_open+0xd3/0x430 drivers/video/fbdev/core/fbmem.c:1418 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1163 Comm: khungtaskd Not tainted 5.8.0-rc5-next-20200714-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+0x44/0xd7 lib/nmi_backtrace.c:105 nmi_trigger_cpumask_backtrace+0x1b3/0x223 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+0xd89/0xf30 kernel/hung_task.c:339 kthread+0x3b5/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 7 Comm: kworker/u4:0 Not tainted 5.8.0-rc5-next-20200714-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: bat_events batadv_nc_worker RIP: 0010:check_wait_context kernel/locking/lockdep.c:4070 [inline] RIP: 0010:__lock_acquire+0x5b6/0x56e0 kernel/locking/lockdep.c:4330 Code: 49 63 c7 48 8d 04 80 4d 8d ac c4 f9 08 00 00 eb 12 41 83 ef 01 49 83 ed 28 41 83 ff ff 0f 84 83 0b 00 00 49 8d 4d df 4c 89 e8 <4c> 89 ef 48 c1 e8 03 83 e7 07 42 0f b6 04 30 40 38 f8 7f 08 84 c0 RSP: 0018:ffffc90000cdfa38 EFLAGS: 00000013 RAX: ffff8880a95a6ab9 RBX: 0000000000000000 RCX: ffff8880a95a6a98 RDX: 0000000000000002 RSI: 0000000000000000 RDI: 0000000000000001 RBP: ffff8880a95a6ae8 R08: 0000000000000000 R09: ffffffff8c6529e7 R10: fffffbfff18ca53c R11: 0000000000000001 R12: ffff8880a95a61c0 R13: ffff8880a95a6ab9 R14: dffffc0000000000 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fd3c0024050 CR3: 00000000a7d68000 CR4: 00000000001506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: lock_acquire+0x1f1/0xad0 kernel/locking/lockdep.c:4959 rcu_lock_acquire include/linux/rcupdate.h:241 [inline] rcu_read_lock include/linux/rcupdate.h:634 [inline] batadv_nc_purge_orig_hash net/batman-adv/network-coding.c:407 [inline] batadv_nc_worker+0x12d/0xe50 net/batman-adv/network-coding.c:718 process_one_work+0x94c/0x1670 kernel/workqueue.c:2269 worker_thread+0x64c/0x1120 kernel/workqueue.c:2415 kthread+0x3b5/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294