random: sshd: uninitialized urandom read (32 bytes read) random: sshd: uninitialized urandom read (32 bytes read) random: sshd: uninitialized urandom read (32 bytes read) random: sshd: uninitialized urandom read (32 bytes read) random: sshd: uninitialized urandom read (32 bytes read) INFO: task syz-executor061:4577 blocked for more than 140 seconds. Not tainted 4.18.0-rc4+ #145 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor061 D21512 4577 4574 0x00000004 Call Trace: context_switch kernel/sched/core.c:2853 [inline] __schedule+0x87c/0x1ed0 kernel/sched/core.c:3501 schedule+0xfb/0x450 kernel/sched/core.c:3545 request_wait_answer+0x4c8/0x920 fs/fuse/dev.c:463 __fuse_request_send+0x12a/0x1d0 fs/fuse/dev.c:483 fuse_request_send+0x62/0xa0 fs/fuse/dev.c:496 fuse_simple_request+0x33d/0x730 fs/fuse/dev.c:554 fuse_lookup_name+0x3ee/0x830 fs/fuse/dir.c:323 fuse_lookup+0xf9/0x4c0 fs/fuse/dir.c:360 __lookup_slow+0x2b5/0x540 fs/namei.c:1630 lookup_slow+0x57/0x80 fs/namei.c:1647 walk_component+0x94a/0x2630 fs/namei.c:1769 lookup_last fs/namei.c:2237 [inline] path_lookupat.isra.45+0x202/0xbf0 fs/namei.c:2287 filename_lookup+0x264/0x510 fs/namei.c:2321 user_path_at_empty+0x40/0x50 fs/namei.c:2584 user_path_at include/linux/namei.h:57 [inline] vfs_statx+0x129/0x210 fs/stat.c:185 vfs_stat include/linux/fs.h:3101 [inline] __do_sys_newstat+0x8f/0x110 fs/stat.c:337 __se_sys_newstat fs/stat.c:333 [inline] __x64_sys_newstat+0x54/0x80 fs/stat.c:333 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x445869 Code: Bad RIP value. RSP: 002b:00007f227e507da8 EFLAGS: 00000297 ORIG_RAX: 0000000000000004 RAX: ffffffffffffffda RBX: 00000000006dac24 RCX: 0000000000445869 RDX: 0000000000445869 RSI: 0000000020000480 RDI: 00000000200000c0 RBP: 00000000006dac20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000297 R12: 0030656c69662f2e R13: 7375662f7665642f R14: 2f30656c69662f2e R15: 0000000000000001 INFO: task syz-executor061:4578 blocked for more than 140 seconds. Not tainted 4.18.0-rc4+ #145 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor061 D24376 4578 4574 0x00000004 Call Trace: context_switch kernel/sched/core.c:2853 [inline] __schedule+0x87c/0x1ed0 kernel/sched/core.c:3501 schedule+0xfb/0x450 kernel/sched/core.c:3545 __rwsem_down_write_failed_common+0x95d/0x1630 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+0xaa/0x130 kernel/locking/rwsem.c:72 inode_lock include/linux/fs.h:715 [inline] fuse_reverse_inval_entry+0xae/0x6d0 fs/fuse/dir.c:969 fuse_notify_delete fs/fuse/dev.c:1541 [inline] fuse_notify fs/fuse/dev.c:1773 [inline] fuse_dev_do_write+0x2d4d/0x3700 fs/fuse/dev.c:1848 fuse_dev_write+0x19a/0x240 fs/fuse/dev.c:1928 call_write_iter include/linux/fs.h:1793 [inline] new_sync_write fs/read_write.c:474 [inline] __vfs_write+0x6c6/0x9f0 fs/read_write.c:487 vfs_write+0x1f8/0x560 fs/read_write.c:549 ksys_write+0x101/0x260 fs/read_write.c:598 __do_sys_write fs/read_write.c:610 [inline] __se_sys_write fs/read_write.c:607 [inline] __x64_sys_write+0x73/0xb0 fs/read_write.c:607 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x445869 Code: Bad RIP value. RSP: 002b:00007f227e4e6da8 EFLAGS: 00000293 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00000000006dac3c RCX: 0000000000445869 RDX: 0000000000000033 RSI: 0000000020000280 RDI: 0000000000000003 RBP: 00000000006dac38 R08: 00007f227e4e7700 R09: 0000000000000000 R10: 00007f227e4e7700 R11: 0000000000000293 R12: 0030656c69662f2e R13: 7375662f7665642f R14: 2f30656c69662f2e R15: 0000000000000001 Showing all locks held in the system: 1 lock held by khungtaskd/902: #0: (____ptrval____) (rcu_read_lock){....}, at: debug_show_all_locks+0xd0/0x428 kernel/locking/lockdep.c:4461 1 lock held by rsyslogd/4457: 2 locks held by getty/4547: #0: (____ptrval____) (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (____ptrval____) (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 2 locks held by getty/4548: #0: (____ptrval____) (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (____ptrval____) (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 2 locks held by getty/4549: #0: (____ptrval____) (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (____ptrval____) (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 2 locks held by getty/4550: #0: (____ptrval____) (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (____ptrval____) (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 2 locks held by getty/4551: #0: (____ptrval____) (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (____ptrval____) (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 2 locks held by getty/4552: #0: (____ptrval____) (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (____ptrval____) (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 2 locks held by getty/4553: #0: (____ptrval____) (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (____ptrval____) (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 2 locks held by syz-executor061/4577: #0: (____ptrval____) (&type->i_mutex_dir_key#3){++++}, at: inode_lock_shared include/linux/fs.h:725 [inline] #0: (____ptrval____) (&type->i_mutex_dir_key#3){++++}, at: lookup_slow+0x49/0x80 fs/namei.c:1646 #1: (____ptrval____) (&fi->mutex){+.+.}, at: fuse_lock_inode+0xaf/0xe0 fs/fuse/inode.c:363 2 locks held by syz-executor061/4578: #0: (____ptrval____) (&fc->killsb){.+.+}, at: fuse_notify_delete fs/fuse/dev.c:1538 [inline] #0: (____ptrval____) (&fc->killsb){.+.+}, at: fuse_notify fs/fuse/dev.c:1773 [inline] #0: (____ptrval____) (&fc->killsb){.+.+}, at: fuse_dev_do_write+0x2cbe/0x3700 fs/fuse/dev.c:1848 #1: (____ptrval____) (&type->i_mutex_dir_key#3){++++}, at: inode_lock include/linux/fs.h:715 [inline] #1: (____ptrval____) (&type->i_mutex_dir_key#3){++++}, at: fuse_reverse_inval_entry+0xae/0x6d0 fs/fuse/dir.c:969 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 902 Comm: khungtaskd Not tainted 4.18.0-rc4+ #145 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.4+0x19/0xce lib/nmi_backtrace.c:103 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:138 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:196 [inline] watchdog+0x9c4/0xf80 kernel/hung_task.c:252 kthread+0x345/0x410 kernel/kthread.c:246 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:412 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-rc4+ #145 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:rebalance_domains+0x232/0xd90 kernel/sched/fair.c:9225 Code: 49 c1 ec 03 4d 89 6e c0 4c 89 eb 48 b8 00 00 00 00 00 fc ff df 41 c6 04 04 f8 e8 19 16 0c 00 85 c0 74 0d 80 3d 6c e4 3f 08 00 <0f> 84 03 07 00 00 4d 85 ed 0f 84 ab 07 00 00 49 8d 86 40 ff ff ff RSP: 0018:ffff8801daf075e8 EFLAGS: 00000246 RAX: 0000000000000001 RBX: ffff8801d9ba9a80 RCX: 1ffff1003b5e0eae RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff8801d9ae8bb4 RBP: ffff8801daf077a8 R08: ffffed003b5e46d7 R09: ffffed003b5e46d6 R10: ffffed003b5e46d6 R11: ffff8801daf236b3 R12: 1ffff1003b5e0ee8 R13: ffff8801d9ba9a80 R14: ffff8801daf07780 R15: ffffffff88e09000 FS: 0000000000000000(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffff600400 CR3: 00000001b07ff000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: _nohz_idle_balance+0x636/0x820 kernel/sched/fair.c:9647 nohz_idle_balance kernel/sched/fair.c:9695 [inline] run_rebalance_domains+0x2c6/0x4c0 kernel/sched/fair.c:9878 __do_softirq+0x2e8/0xb17 kernel/softirq.c:288 invoke_softirq kernel/softirq.c:368 [inline] irq_exit+0x1d1/0x200 kernel/softirq.c:408 scheduler_ipi+0x53c/0xa50 kernel/sched/core.c:1800 smp_reschedule_interrupt+0xf5/0x670 arch/x86/kernel/smp.c:277 reschedule_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:887 RIP: 0010:native_safe_halt+0x6/0x10 arch/x86/include/asm/irqflags.h:54 Code: c7 48 89 45 d8 e8 ba ff 25 fa 48 8b 45 d8 e9 d2 fe ff ff 48 89 df e8 a9 ff 25 fa 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:ffff8801d9af7c38 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff02 RAX: dffffc0000000000 RBX: 1ffff1003b35ef8a RCX: 0000000000000000 RDX: 1ffffffff11e3610 RSI: 0000000000000001 RDI: ffffffff88f1b080 RBP: ffff8801d9af7c38 R08: ffffed003b5e46d7 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000001 R13: ffff8801d9af7cf0 R14: ffffffff899ed0e0 R15: 0000000000000000 arch_safe_halt arch/x86/include/asm/paravirt.h:94 [inline] default_idle+0xc7/0x450 arch/x86/kernel/process.c:500 arch_cpu_idle+0x10/0x20 arch/x86/kernel/process.c:491 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:270 secondary_startup_64+0xa5/0xb0 arch/x86/kernel/head_64.S:242