INFO: task syz-executor.4:28484 can't die for more than 143 seconds. syz-executor.4 D29192 28484 8813 0x00000004 Call Trace: context_switch kernel/sched/core.c:3385 [inline] __schedule+0x8e1/0x1f30 kernel/sched/core.c:4081 schedule+0xdc/0x2b0 kernel/sched/core.c:4155 rwsem_down_write_slowpath+0x706/0xf80 kernel/locking/rwsem.c:1238 __down_write kernel/locking/rwsem.c:1392 [inline] down_write+0x13c/0x150 kernel/locking/rwsem.c:1535 inode_lock include/linux/fs.h:791 [inline] do_last fs/namei.c:3315 [inline] path_openat+0x1484/0x4710 fs/namei.c:3529 do_filp_open+0x1a1/0x280 fs/namei.c:3559 do_sys_open+0x3fe/0x5d0 fs/open.c:1097 __do_sys_openat fs/open.c:1124 [inline] __se_sys_openat fs/open.c:1118 [inline] __x64_sys_openat+0x9d/0x100 fs/open.c:1118 do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45a639 Code: Bad RIP value. RSP: 002b:00007f7f6e791c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 000000000045a639 RDX: 0000000000000040 RSI: 0000000020000180 RDI: ffffffffffffff9c RBP: 000000000075bfc8 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000155 R11: 0000000000000246 R12: 00007f7f6e7926d4 R13: 00000000004c72f9 R14: 00000000004dcd20 R15: 00000000ffffffff INFO: task syz-executor.4:28484 blocked for more than 143 seconds. Not tainted 5.4.0-rc8-next-20191120-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.4 D29192 28484 8813 0x00000004 Call Trace: context_switch kernel/sched/core.c:3385 [inline] __schedule+0x8e1/0x1f30 kernel/sched/core.c:4081 schedule+0xdc/0x2b0 kernel/sched/core.c:4155 rwsem_down_write_slowpath+0x706/0xf80 kernel/locking/rwsem.c:1238 __down_write kernel/locking/rwsem.c:1392 [inline] down_write+0x13c/0x150 kernel/locking/rwsem.c:1535 inode_lock include/linux/fs.h:791 [inline] do_last fs/namei.c:3315 [inline] path_openat+0x1484/0x4710 fs/namei.c:3529 do_filp_open+0x1a1/0x280 fs/namei.c:3559 do_sys_open+0x3fe/0x5d0 fs/open.c:1097 __do_sys_openat fs/open.c:1124 [inline] __se_sys_openat fs/open.c:1118 [inline] __x64_sys_openat+0x9d/0x100 fs/open.c:1118 do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45a639 Code: Bad RIP value. RSP: 002b:00007f7f6e791c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 000000000045a639 RDX: 0000000000000040 RSI: 0000000020000180 RDI: ffffffffffffff9c RBP: 000000000075bfc8 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000155 R11: 0000000000000246 R12: 00007f7f6e7926d4 R13: 00000000004c72f9 R14: 00000000004dcd20 R15: 00000000ffffffff INFO: task syz-executor.4:29185 can't die for more than 143 seconds. syz-executor.4 D29712 29185 8813 0x00000004 Call Trace: context_switch kernel/sched/core.c:3385 [inline] __schedule+0x8e1/0x1f30 kernel/sched/core.c:4081 schedule+0xdc/0x2b0 kernel/sched/core.c:4155 rwsem_down_write_slowpath+0x706/0xf80 kernel/locking/rwsem.c:1238 __down_write kernel/locking/rwsem.c:1392 [inline] down_write_nested+0x140/0x160 kernel/locking/rwsem.c:1631 inode_lock_nested include/linux/fs.h:826 [inline] filename_create+0x17c/0x4f0 fs/namei.c:3630 user_path_create fs/namei.c:3688 [inline] do_mknodat fs/namei.c:3749 [inline] do_mknodat+0x1a4/0x480 fs/namei.c:3737 __do_sys_mknod fs/namei.c:3789 [inline] __se_sys_mknod fs/namei.c:3787 [inline] __x64_sys_mknod+0x7b/0xb0 fs/namei.c:3787 do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45a639 Code: Bad RIP value. RSP: 002b:00007f7f6e770c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000085 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045a639 RDX: 0000000000000708 RSI: 00000000ffffc000 RDI: 0000000020000000 RBP: 000000000075c070 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f7f6e7716d4 R13: 00000000004c7033 R14: 00000000004dc780 R15: 00000000ffffffff INFO: task syz-executor.4:29185 blocked for more than 144 seconds. Not tainted 5.4.0-rc8-next-20191120-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.4 D29712 29185 8813 0x00000004 Call Trace: context_switch kernel/sched/core.c:3385 [inline] __schedule+0x8e1/0x1f30 kernel/sched/core.c:4081 schedule+0xdc/0x2b0 kernel/sched/core.c:4155 rwsem_down_write_slowpath+0x706/0xf80 kernel/locking/rwsem.c:1238 __down_write kernel/locking/rwsem.c:1392 [inline] down_write_nested+0x140/0x160 kernel/locking/rwsem.c:1631 inode_lock_nested include/linux/fs.h:826 [inline] filename_create+0x17c/0x4f0 fs/namei.c:3630 user_path_create fs/namei.c:3688 [inline] do_mknodat fs/namei.c:3749 [inline] do_mknodat+0x1a4/0x480 fs/namei.c:3737 __do_sys_mknod fs/namei.c:3789 [inline] __se_sys_mknod fs/namei.c:3787 [inline] __x64_sys_mknod+0x7b/0xb0 fs/namei.c:3787 do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45a639 Code: Bad RIP value. RSP: 002b:00007f7f6e770c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000085 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045a639 RDX: 0000000000000708 RSI: 00000000ffffc000 RDI: 0000000020000000 RBP: 000000000075c070 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f7f6e7716d4 R13: 00000000004c7033 R14: 00000000004dc780 R15: 00000000ffffffff INFO: task syz-executor.4:29186 can't die for more than 144 seconds. syz-executor.4 D28184 29186 8813 0x00004004 Call Trace: context_switch kernel/sched/core.c:3385 [inline] __schedule+0x8e1/0x1f30 kernel/sched/core.c:4081 schedule+0xdc/0x2b0 kernel/sched/core.c:4155 rwsem_down_write_slowpath+0x706/0xf80 kernel/locking/rwsem.c:1238 __down_write kernel/locking/rwsem.c:1392 [inline] down_write+0x13c/0x150 kernel/locking/rwsem.c:1535 inode_lock include/linux/fs.h:791 [inline] lock_mount+0x8c/0x2e0 fs/namespace.c:2134 do_add_mount+0x27/0x380 fs/namespace.c:2708 do_new_mount_fc fs/namespace.c:2771 [inline] do_new_mount fs/namespace.c:2824 [inline] do_mount+0x1701/0x1b50 fs/namespace.c:3142 ksys_mount+0xdb/0x150 fs/namespace.c:3351 __do_sys_mount fs/namespace.c:3365 [inline] __se_sys_mount fs/namespace.c:3362 [inline] __x64_sys_mount+0xbe/0x150 fs/namespace.c:3362 do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45a639 Code: Bad RIP value. RSP: 002b:00007f7f6e74fc78 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 000000000045a639 RDX: 0000000020000300 RSI: 0000000020000200 RDI: 0000000000000000 RBP: 000000000075c118 R08: 00000000200005c0 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f7f6e7506d4 R13: 00000000004c7138 R14: 00000000004dc960 R15: 00000000ffffffff INFO: task syz-executor.4:29186 blocked for more than 144 seconds. Not tainted 5.4.0-rc8-next-20191120-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.4 D28184 29186 8813 0x00004004 Call Trace: context_switch kernel/sched/core.c:3385 [inline] __schedule+0x8e1/0x1f30 kernel/sched/core.c:4081 schedule+0xdc/0x2b0 kernel/sched/core.c:4155 rwsem_down_write_slowpath+0x706/0xf80 kernel/locking/rwsem.c:1238 __down_write kernel/locking/rwsem.c:1392 [inline] down_write+0x13c/0x150 kernel/locking/rwsem.c:1535 inode_lock include/linux/fs.h:791 [inline] lock_mount+0x8c/0x2e0 fs/namespace.c:2134 do_add_mount+0x27/0x380 fs/namespace.c:2708 do_new_mount_fc fs/namespace.c:2771 [inline] do_new_mount fs/namespace.c:2824 [inline] do_mount+0x1701/0x1b50 fs/namespace.c:3142 ksys_mount+0xdb/0x150 fs/namespace.c:3351 __do_sys_mount fs/namespace.c:3365 [inline] __se_sys_mount fs/namespace.c:3362 [inline] __x64_sys_mount+0xbe/0x150 fs/namespace.c:3362 do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45a639 Code: Bad RIP value. RSP: 002b:00007f7f6e74fc78 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 000000000045a639 RDX: 0000000020000300 RSI: 0000000020000200 RDI: 0000000000000000 RBP: 000000000075c118 R08: 00000000200005c0 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f7f6e7506d4 R13: 00000000004c7138 R14: 00000000004dc960 R15: 00000000ffffffff Showing all locks held in the system: 1 lock held by khungtaskd/1083: #0: ffffffff88fabc00 (rcu_read_lock){....}, at: debug_show_all_locks+0x5f/0x279 kernel/locking/lockdep.c:5334 2 locks held by rsyslogd/8670: #0: ffff8880a59abba0 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xee/0x110 fs/file.c:801 #1: ffff8880ae837358 (&rq->lock){-.-.}, at: rq_lock kernel/sched/sched.h:1215 [inline] #1: ffff8880ae837358 (&rq->lock){-.-.}, at: __schedule+0x232/0x1f30 kernel/sched/core.c:4029 2 locks held by getty/8760: #0: ffff88809b502090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340 #1: ffffc90005f672e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 drivers/tty/n_tty.c:2156 2 locks held by getty/8761: #0: ffff8880960bb090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340 #1: ffffc90005f512e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 drivers/tty/n_tty.c:2156 2 locks held by getty/8762: #0: ffff88808e05e090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340 #1: ffffc90005f452e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 drivers/tty/n_tty.c:2156 2 locks held by getty/8763: #0: ffff8880989ac090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340 #1: ffffc90005f492e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 drivers/tty/n_tty.c:2156 2 locks held by getty/8764: #0: ffff888098c3a090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340 #1: ffffc90005f612e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 drivers/tty/n_tty.c:2156 2 locks held by getty/8765: #0: ffff888099863090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340 #1: ffffc90005f6b2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 drivers/tty/n_tty.c:2156 2 locks held by getty/8766: #0: ffff88808fb2e090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340 #1: ffffc90005f392e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 drivers/tty/n_tty.c:2156 2 locks held by syz-executor.4/28393: #0: ffff88805f018428 (sb_writers#19){.+.+}, at: sb_start_write include/linux/fs.h:1650 [inline] #0: ffff88805f018428 (sb_writers#19){.+.+}, at: mnt_want_write+0x3f/0xc0 fs/namespace.c:354 #1: ffff888093e4cc90 (&sb->s_type->i_mutex_key#27/1){+.+.}, at: inode_lock_nested include/linux/fs.h:826 [inline] #1: ffff888093e4cc90 (&sb->s_type->i_mutex_key#27/1){+.+.}, at: filename_create+0x17c/0x4f0 fs/namei.c:3630 2 locks held by syz-executor.4/28484: #0: ffff88805f018428 (sb_writers#19){.+.+}, at: sb_start_write include/linux/fs.h:1650 [inline] #0: ffff88805f018428 (sb_writers#19){.+.+}, at: mnt_want_write+0x3f/0xc0 fs/namespace.c:354 #1: ffff888093e4cc90 (&sb->s_type->i_mutex_key#28){++++}, at: inode_lock include/linux/fs.h:791 [inline] #1: ffff888093e4cc90 (&sb->s_type->i_mutex_key#28){++++}, at: do_last fs/namei.c:3315 [inline] #1: ffff888093e4cc90 (&sb->s_type->i_mutex_key#28){++++}, at: path_openat+0x1484/0x4710 fs/namei.c:3529 2 locks held by syz-executor.4/29185: #0: ffff88805f018428 (sb_writers#19){.+.+}, at: sb_start_write include/linux/fs.h:1650 [inline] #0: ffff88805f018428 (sb_writers#19){.+.+}, at: mnt_want_write+0x3f/0xc0 fs/namespace.c:354 #1: ffff888093e4cc90 (&sb->s_type->i_mutex_key#27/1){+.+.}, at: inode_lock_nested include/linux/fs.h:826 [inline] #1: ffff888093e4cc90 (&sb->s_type->i_mutex_key#27/1){+.+.}, at: filename_create+0x17c/0x4f0 fs/namei.c:3630 1 lock held by syz-executor.4/29186: #0: ffff888093e4cc90 (&sb->s_type->i_mutex_key#28){++++}, at: inode_lock include/linux/fs.h:791 [inline] #0: ffff888093e4cc90 (&sb->s_type->i_mutex_key#28){++++}, at: lock_mount+0x8c/0x2e0 fs/namespace.c:2134 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1083 Comm: khungtaskd Not tainted 5.4.0-rc8-next-20191120-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:269 [inline] watchdog+0xc8f/0x1350 kernel/hung_task.c:353 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 skipped: idling at native_safe_halt+0xe/0x10 arch/x86/include/asm/irqflags.h:60