random: sshd: uninitialized urandom read (32 bytes read) random: sshd: uninitialized urandom read (32 bytes read) kworker/dying (51) used greatest stack depth: 16504 bytes left random: sshd: uninitialized urandom read (32 bytes read) random: sshd: uninitialized urandom read (32 bytes read) INFO: task syz-executor210:4524 blocked for more than 140 seconds. Not tainted 4.18.0-rc5+ #156 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor210 D23528 4524 4521 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_hash+0x12e/0x190 fs/namei.c:1505 filename_create+0x1e5/0x5b0 fs/namei.c:3646 user_path_create fs/namei.c:3703 [inline] do_mkdirat+0xda/0x310 fs/namei.c:3842 __do_sys_mkdirat fs/namei.c:3861 [inline] __se_sys_mkdirat fs/namei.c:3859 [inline] __x64_sys_mkdirat+0x76/0xb0 fs/namei.c:3859 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x445849 Code: e8 7c b7 02 00 48 83 c4 18 c3 0f 1f 80 00 00 00 00 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 2b 12 fc ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fbe78031da8 EFLAGS: 00000293 ORIG_RAX: 0000000000000102 RAX: ffffffffffffffda RBX: 00000000006dac24 RCX: 0000000000445849 RDX: 0000000000000000 RSI: 0000000020000500 RDI: 00000000ffffff9c RBP: 00000000006dac20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000293 R12: 0030656c69662f2e R13: 65646f6d746f6f72 R14: 2f30656c69662f2e R15: 0000000000000008 INFO: task syz-executor210:4525 blocked for more than 140 seconds. Not tainted 4.18.0-rc5+ #156 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor210 D25408 4525 4521 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_nested+0xae/0x130 kernel/locking/rwsem.c:194 inode_lock_nested include/linux/fs.h:750 [inline] filename_create+0x1b2/0x5b0 fs/namei.c:3645 user_path_create fs/namei.c:3703 [inline] do_mkdirat+0xda/0x310 fs/namei.c:3842 __do_sys_mkdirat fs/namei.c:3861 [inline] __se_sys_mkdirat fs/namei.c:3859 [inline] __x64_sys_mkdirat+0x76/0xb0 fs/namei.c:3859 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x445849 Code: e8 7c b7 02 00 48 83 c4 18 c3 0f 1f 80 00 00 00 00 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 2b 12 fc ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fbe78010da8 EFLAGS: 00000293 ORIG_RAX: 0000000000000102 RAX: ffffffffffffffda RBX: 00000000006dac3c RCX: 0000000000445849 RDX: 0000000000000000 RSI: 0000000020000500 RDI: 00000000ffffff9c RBP: 00000000006dac38 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000293 R12: 0030656c69662f2e R13: 65646f6d746f6f72 R14: 2f30656c69662f2e R15: 0000000000000008 Showing all locks held in the system: 1 lock held by khungtaskd/901: #0: (____ptrval____) (rcu_read_lock){....}, at: debug_show_all_locks+0xd0/0x428 kernel/locking/lockdep.c:4461 1 lock held by rsyslogd/4404: 2 locks held by getty/4494: #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/4495: #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/4496: #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/4497: #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/4498: #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/4499: #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/4500: #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 3 locks held by syz-executor210/4524: #0: (____ptrval____) (sb_writers#9){.+.+}, at: sb_start_write include/linux/fs.h:1554 [inline] #0: (____ptrval____) (sb_writers#9){.+.+}, at: mnt_want_write+0x3f/0xc0 fs/namespace.c:386 #1: (____ptrval____) (&type->i_mutex_dir_key#3/1){+.+.}, at: inode_lock_nested include/linux/fs.h:750 [inline] #1: (____ptrval____) (&type->i_mutex_dir_key#3/1){+.+.}, at: filename_create+0x1b2/0x5b0 fs/namei.c:3645 #2: (____ptrval____) (&fi->mutex){+.+.}, at: fuse_lock_inode+0xaf/0xe0 fs/fuse/inode.c:363 2 locks held by syz-executor210/4525: #0: (____ptrval____) (sb_writers#9){.+.+}, at: sb_start_write include/linux/fs.h:1554 [inline] #0: (____ptrval____) (sb_writers#9){.+.+}, at: mnt_want_write+0x3f/0xc0 fs/namespace.c:386 #1: (____ptrval____) (&type->i_mutex_dir_key#3/1){+.+.}, at: inode_lock_nested include/linux/fs.h:750 [inline] #1: (____ptrval____) (&type->i_mutex_dir_key#3/1){+.+.}, at: filename_create+0x1b2/0x5b0 fs/namei.c:3645 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 901 Comm: khungtaskd Not tainted 4.18.0-rc5+ #156 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 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.18.0-rc5+ #156 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:lookup_chain_cache kernel/locking/lockdep.c:2319 [inline] RIP: 0010:lookup_chain_cache_add kernel/locking/lockdep.c:2338 [inline] RIP: 0010:validate_chain kernel/locking/lockdep.c:2392 [inline] RIP: 0010:__lock_acquire+0xeec/0x5020 kernel/locking/lockdep.c:3435 Code: 00 48 83 fb 08 0f 84 ee 00 00 00 48 8d 7b 10 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 11 36 00 00 4c 3b 5b 10 0f 84 3f fb ff ff <48> 8d 8c 24 60 02 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 ca 48 RSP: 0018:ffff8801dae076d0 EFLAGS: 00000017 RAX: dffffc0000000000 RBX: ffffffff89f1a8c8 RCX: 00000000c38e570c RDX: 1ffffffff13e351b RSI: 0000000000000000 RDI: ffffffff89f1a8d8 RBP: ffff8801dae07a60 R08: 0000000000001e68 R09: 0000000000000000 R10: ffffffff88e765f8 R11: 05bc14afc5dd28c2 R12: 1ffff1003b5c0f1e R13: 0000000000000000 R14: ffffffff88e75dc0 R15: 0000000000000001 FS: 0000000000000000(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffff600400 CR3: 00000001b0820000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: lock_acquire+0x1e4/0x540 kernel/locking/lockdep.c:3924 seqcount_lockdep_reader_access include/linux/seqlock.h:81 [inline] read_seqcount_begin include/linux/seqlock.h:164 [inline] ktime_get+0x14e/0x440 kernel/time/timekeeping.c:744 tick_nohz_irq_enter kernel/time/tick-sched.c:1228 [inline] tick_irq_enter+0x83/0x390 kernel/time/tick-sched.c:1249 irq_enter+0xb6/0xd0 kernel/softirq.c:353 scheduler_ipi+0x3a9/0xa50 kernel/sched/core.c:1790 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 aa 7a 27 fa 48 8b 45 d8 e9 d2 fe ff ff 48 89 df e8 99 7a 27 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:ffffffff88e07bc0 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff02 RAX: dffffc0000000000 RBX: 1ffffffff11c0f7b RCX: 0000000000000000 RDX: 1ffffffff11e3618 RSI: 0000000000000001 RDI: ffffffff88f1b0c0 RBP: ffffffff88e07bc0 R08: ffffed003b5c46d7 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: ffffffff88e07c78 R14: ffffffff899ecb60 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 rest_init+0xe1/0xe4 init/main.c:442 start_kernel+0x90e/0x949 init/main.c:738 x86_64_start_reservations+0x29/0x2b arch/x86/kernel/head64.c:452 x86_64_start_kernel+0x76/0x79 arch/x86/kernel/head64.c:433 secondary_startup_64+0xa5/0xb0 arch/x86/kernel/head_64.S:242