INFO: task syz-executor1:17268 blocked for more than 140 seconds. Not tainted 4.18.0+ #198 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor1 D24224 17268 4428 0x00000004 Call Trace: context_switch kernel/sched/core.c:2823 [inline] __schedule+0x87c/0x1ec0 kernel/sched/core.c:3471 schedule+0xfb/0x450 kernel/sched/core.c:3515 __rwsem_down_write_failed_common+0x98b/0x1650 kernel/locking/rwsem-xadd.c:566 rwsem_down_write_failed+0xe/0x10 kernel/locking/rwsem-xadd.c:595 call_rwsem_down_write_failed+0x17/0x30 arch/x86/lib/rwsem.S:117 __down_write arch/x86/include/asm/rwsem.h:142 [inline] down_write_nested+0xae/0x130 kernel/locking/rwsem.c:194 inode_lock_nested include/linux/fs.h:768 [inline] lock_rename+0x236/0x290 fs/namei.c:2821 do_renameat2+0x69e/0x1120 fs/namei.c:4530 __do_sys_rename fs/namei.c:4626 [inline] __se_sys_rename fs/namei.c:4624 [inline] __x64_sys_rename+0x5e/0x80 fs/namei.c:4624 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457089 Code: 08 e8 3b a9 fb ff 48 8b 44 24 20 48 8b 4c 24 18 48 8b 54 24 38 48 8b 7c 24 48 eb 8d 48 8b 6c 24 50 48 83 c4 58 c3 48 89 04 24 <48> 89 5c 24 08 e8 0d a9 fb ff 48 8b 44 24 40 48 8b 4c 24 48 48 8b RSP: 002b:00007fa1818e0c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000052 RAX: ffffffffffffffda RBX: 00007fa1818e16d4 RCX: 0000000000457089 RDX: 0000000000000000 RSI: 00000000200000c0 RDI: 0000000020000040 RBP: 00000000009301e0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000004d3890 R14: 00000000004c851a R15: 0000000000000002 Showing all locks held in the system: 1 lock held by khungtaskd/775: #0: 00000000fd73a784 (rcu_read_lock){....}, at: debug_show_all_locks+0xd0/0x428 kernel/locking/lockdep.c:4461 1 lock held by rsyslogd/4289: #0: 0000000087775658 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x1bb/0x200 fs/file.c:766 2 locks held by getty/4379: #0: 00000000b18eef07 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:353 #1: 00000000cf7490bd (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 2 locks held by getty/4380: #0: 00000000693192cf (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:353 #1: 00000000c9312925 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 2 locks held by getty/4381: #0: 00000000118c0627 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:353 #1: 00000000d7c92bf5 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 2 locks held by getty/4382: #0: 000000002a771787 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:353 #1: 00000000506dafa9 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 2 locks held by getty/4383: #0: 0000000011495b14 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:353 #1: 00000000c2ea318f (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 2 locks held by getty/4384: #0: 0000000086661abf (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:353 #1: 00000000500b2946 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 2 locks held by getty/4385: #0: 0000000005d3b6ca (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:353 #1: 00000000819815e6 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 3 locks held by syz-executor1/17239: #0: 0000000088f662ee (sb_writers#24){.+.+}, at: sb_start_write include/linux/fs.h:1572 [inline] #0: 0000000088f662ee (sb_writers#24){.+.+}, at: mnt_want_write+0x3f/0xc0 fs/namespace.c:386 #1: 0000000044e83e71 (&sb->s_type->i_mutex_key#17/1){+.+.}, at: inode_lock_nested include/linux/fs.h:768 [inline] #1: 0000000044e83e71 (&sb->s_type->i_mutex_key#17/1){+.+.}, at: lock_rename+0x236/0x290 fs/namei.c:2821 #2: 00000000dec81383 (&sb->s_type->i_mutex_key#17/4){+.+.}, at: inode_lock_nested include/linux/fs.h:768 [inline] #2: 00000000dec81383 (&sb->s_type->i_mutex_key#17/4){+.+.}, at: lock_two_nondirectories+0xdd/0x120 fs/inode.c:1009 2 locks held by syz-executor1/17268: #0: 0000000088f662ee (sb_writers#24){.+.+}, at: sb_start_write include/linux/fs.h:1572 [inline] #0: 0000000088f662ee (sb_writers#24){.+.+}, at: mnt_want_write+0x3f/0xc0 fs/namespace.c:386 #1: 0000000044e83e71 (&sb->s_type->i_mutex_key#17/1){+.+.}, at: inode_lock_nested include/linux/fs.h:768 [inline] #1: 0000000044e83e71 (&sb->s_type->i_mutex_key#17/1){+.+.}, at: lock_rename+0x236/0x290 fs/namei.c:2821 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 775 Comm: khungtaskd Not tainted 4.18.0+ #198 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+0x1c9/0x2b4 lib/dump_stack.c:113 nmi_cpu_backtrace.cold.3+0x48/0x88 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x151/0x192 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:144 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:196 [inline] watchdog+0x9c4/0xf80 kernel/hung_task.c:252 kthread+0x35a/0x420 kernel/kthread.c:246 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:413 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 0 Comm: swapper/1 Not tainted 4.18.0+ #198 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:trace_softirqs_off+0xe1/0x380 kernel/locking/lockdep.c:2989 Code: c1 ea 03 0f b6 14 02 4c 89 e0 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 50 02 00 00 8b 3d 07 53 30 08 85 ff 0f 84 1c 01 00 00 <48> 8d bb 20 08 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 RSP: 0018:ffff8801db107aa0 EFLAGS: 00000046 RAX: 0000000000000086 RBX: ffff8801d9f1a380 RCX: 0000000000000000 RDX: 1ffffffff0fe3794 RSI: 0000000080000001 RDI: ffffffff87f1bca0 RBP: ffff8801db107ab8 R08: 0000000000000000 R09: 0000000000000001 R10: ffffed003b6246d6 R11: ffff8801db1236b3 R12: ffffffff89907820 R13: ffffffff8149eaa6 R14: ffff8801db107e68 R15: 0000000000000001 FS: 0000000000000000(0000) GS:ffff8801db100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f3954c66e04 CR3: 00000001b1803000 CR4: 00000000001406e0 Call Trace: __local_bh_disable_ip+0xe9/0x120 kernel/softirq.c:129 __do_softirq+0x175/0xb1e kernel/softirq.c:269 invoke_softirq kernel/softirq.c:372 [inline] irq_exit+0x1d6/0x210 kernel/softirq.c:412 scheduler_ipi+0x53c/0xa50 kernel/sched/core.c:1780 smp_reschedule_interrupt+0xfd/0x680 arch/x86/kernel/smp.c:278 reschedule_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:888 RIP: 0010:native_safe_halt+0x6/0x10 arch/x86/include/asm/irqflags.h:56 Code: c7 48 89 45 d8 e8 fa 86 04 fb 48 8b 45 d8 e9 d2 fe ff ff 48 89 df e8 e9 86 04 fb eb 8a 90 90 90 90 90 90 90 55 48 89 e5 fb f4 <5d> c3 0f 1f 84 00 00 00 00 00 55 48 89 e5 f4 5d c3 90 90 90 90 90 RSP: 0018:ffff8801d9f27c38 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff02 RAX: dffffc0000000000 RBX: 1ffff1003b3e4f8a RCX: 0000000000000000 RDX: 1ffffffff0fe3798 RSI: 0000000000000001 RDI: ffffffff87f1bcc0 RBP: ffff8801d9f27c38 R08: ffffed003b6246d7 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000001 R13: ffff8801d9f27cf0 R14: ffffffff888b8c20 R15: 0000000000000000 arch_safe_halt arch/x86/include/asm/paravirt.h:94 [inline] default_idle+0xc7/0x450 arch/x86/kernel/process.c:498 arch_cpu_idle+0x10/0x20 arch/x86/kernel/process.c:489 default_idle_call+0x6d/0x90 kernel/sched/idle.c:93 cpuidle_idle_call kernel/sched/idle.c:153 [inline] do_idle+0x3aa/0x570 kernel/sched/idle.c:262 cpu_startup_entry+0x10c/0x120 kernel/sched/idle.c:368 start_secondary+0x433/0x5d0 arch/x86/kernel/smpboot.c:271 secondary_startup_64+0xa4/0xb0 arch/x86/kernel/head_64.S:242