================================ WARNING: inconsistent lock state 4.17.0-rc2+ #28 Not tainted -------------------------------- inconsistent {HARDIRQ-ON-W} -> {IN-HARDIRQ-W} usage. sshd/4507 [HC1[1]:SC0[0]:HE0:SE1] takes: (ptrval) (fs_reclaim){?.+.}, at: fs_reclaim_acquire.part.82+0x0/0x30 mm/page_alloc.c:463 {HARDIRQ-ON-W} state was registered at: lock_acquire+0x1dc/0x520 kernel/locking/lockdep.c:3920 fs_reclaim_acquire.part.82+0x24/0x30 mm/page_alloc.c:3739 fs_reclaim_acquire+0x14/0x20 mm/page_alloc.c:3740 slab_pre_alloc_hook mm/slab.h:418 [inline] slab_alloc_node mm/slab.c:3299 [inline] kmem_cache_alloc_node_trace+0x39/0x770 mm/slab.c:3661 kmalloc_node include/linux/slab.h:550 [inline] kzalloc_node include/linux/slab.h:712 [inline] alloc_worker+0xbd/0x2e0 kernel/workqueue.c:1704 init_rescuer.part.25+0x1f/0x190 kernel/workqueue.c:4000 init_rescuer kernel/workqueue.c:3997 [inline] workqueue_init+0x51f/0x7d0 kernel/workqueue.c:5732 kernel_init_freeable+0x2ad/0x58e init/main.c:1115 kernel_init+0x11/0x1b3 init/main.c:1053 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:412 irq event stamp: 517352 hardirqs last enabled at (517351): [] seqcount_lockdep_reader_access include/linux/seqlock.h:83 [inline] hardirqs last enabled at (517351): [] read_seqcount_begin include/linux/seqlock.h:164 [inline] hardirqs last enabled at (517351): [] ktime_get_ts64+0x405/0x510 kernel/time/timekeeping.c:850 hardirqs last disabled at (517352): [] interrupt_entry+0xb5/0xf0 arch/x86/entry/entry_64.S:625 softirqs last enabled at (517344): [] spin_unlock_bh include/linux/spinlock.h:355 [inline] softirqs last enabled at (517344): [] release_sock+0x1e2/0x2b0 net/core/sock.c:2864 softirqs last disabled at (517342): [] spin_lock_bh include/linux/spinlock.h:315 [inline] softirqs last disabled at (517342): [] release_sock+0x74/0x2b0 net/core/sock.c:2851 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(fs_reclaim); lock(fs_reclaim); *** DEADLOCK *** no locks held by sshd/4507. stack backtrace: CPU: 0 PID: 4507 Comm: sshd Not tainted 4.17.0-rc2+ #28 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+0x1b9/0x294 lib/dump_stack.c:113 print_usage_bug.cold.59+0x320/0x41a kernel/locking/lockdep.c:2542 valid_state kernel/locking/lockdep.c:2555 [inline] mark_lock_irq kernel/locking/lockdep.c:2749 [inline] mark_lock+0x1034/0x19e0 kernel/locking/lockdep.c:3147 mark_irqflags kernel/locking/lockdep.c:3022 [inline] __lock_acquire+0x1595/0x5140 kernel/locking/lockdep.c:3388 lock_acquire+0x1dc/0x520 kernel/locking/lockdep.c:3920 fs_reclaim_acquire.part.82+0x24/0x30 mm/page_alloc.c:3739 fs_reclaim_acquire+0x14/0x20 mm/page_alloc.c:3740 slab_pre_alloc_hook mm/slab.h:418 [inline] slab_alloc mm/slab.c:3378 [inline] __do_kmalloc mm/slab.c:3716 [inline] __kmalloc+0x45/0x760 mm/slab.c:3727 kmalloc_array include/linux/slab.h:631 [inline] kcalloc include/linux/slab.h:642 [inline] numa_crng_init drivers/char/random.c:798 [inline] crng_reseed+0x427/0x920 drivers/char/random.c:923 credit_entropy_bits+0x98d/0xa30 drivers/char/random.c:708 add_interrupt_randomness+0x494/0x860 drivers/char/random.c:1254 handle_irq_event_percpu+0xf9/0x1c0 kernel/irq/handle.c:191 handle_irq_event+0xa7/0x135 kernel/irq/handle.c:206 handle_edge_irq+0x20f/0x870 kernel/irq/chip.c:791 generic_handle_irq_desc include/linux/irqdesc.h:159 [inline] handle_irq+0x18c/0x2e7 arch/x86/kernel/irq_64.c:77 do_IRQ+0x78/0x190 arch/x86/kernel/irq.c:245 common_interrupt+0xf/0xf arch/x86/entry/entry_64.S:642 RIP: 0010:get_current arch/x86/include/asm/current.h:15 [inline] RIP: 0010:write_comp_data+0xa/0x70 kernel/kcov.c:121 RSP: 0018:ffff8801d021fa20 EFLAGS: 00000246 ORIG_RAX: ffffffffffffffd5 RAX: dffffc0000000000 RBX: 00007ffffffff000 RCX: ffffffff81a73dd5 RDX: 00007ffffffff000 RSI: ffffffffffffffff RDI: 0000000000000007 RBP: ffff8801d021fa30 R08: ffff8801c36f2180 R09: ffffed003b5c46c2 R10: 0000000000000003 R11: 0000000000000000 R12: ffffffff87fa1060 R13: 000000000000000a R14: ffff8801d021fba8 R15: 000055bd7d8edaf0 __might_fault+0x55/0x1e0 mm/memory.c:4548 _copy_from_user+0x30/0x150 lib/usercopy.c:10 copy_from_user include/linux/uaccess.h:147 [inline] get_fd_set fs/select.c:367 [inline] core_sys_select+0x3e2/0xb60 fs/select.c:647 kern_select+0x1b7/0x250 fs/select.c:696 __do_sys_select fs/select.c:705 [inline] __se_sys_select fs/select.c:702 [inline] __x64_sys_select+0xbe/0x150 fs/select.c:702 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7fa0997a2dd3 RSP: 002b:00007fff91aa07b8 EFLAGS: 00000246 ORIG_RAX: 0000000000000017 RAX: ffffffffffffffda RBX: 00007fff91aa0840 RCX: 00007fa0997a2dd3 RDX: 000055bd7d8edad0 RSI: 000055bd7d8edaf0 RDI: 000000000000000c RBP: 000055bd7d4318dc R08: 00007fff91aa07e0 R09: 0101010101010101 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fff91aa0848 R13: 0000000000000000 R14: 00007fff91aa0838 R15: 00007fff91aa083c BUG: sleeping function called from invalid context at mm/slab.h:421 in_atomic(): 1, irqs_disabled(): 1, pid: 4507, name: sshd INFO: lockdep is turned off. irq event stamp: 517352 hardirqs last enabled at (517351): [] seqcount_lockdep_reader_access include/linux/seqlock.h:83 [inline] hardirqs last enabled at (517351): [] read_seqcount_begin include/linux/seqlock.h:164 [inline] hardirqs last enabled at (517351): [] ktime_get_ts64+0x405/0x510 kernel/time/timekeeping.c:850 hardirqs last disabled at (517352): [] interrupt_entry+0xb5/0xf0 arch/x86/entry/entry_64.S:625 softirqs last enabled at (517344): [] spin_unlock_bh include/linux/spinlock.h:355 [inline] softirqs last enabled at (517344): [] release_sock+0x1e2/0x2b0 net/core/sock.c:2864 softirqs last disabled at (517342): [] spin_lock_bh include/linux/spinlock.h:315 [inline] softirqs last disabled at (517342): [] release_sock+0x74/0x2b0 net/core/sock.c:2851 CPU: 0 PID: 4507 Comm: sshd Not tainted 4.17.0-rc2+ #28 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+0x1b9/0x294 lib/dump_stack.c:113 ___might_sleep.cold.87+0x11f/0x13a kernel/sched/core.c:6188 __might_sleep+0x95/0x190 kernel/sched/core.c:6141 slab_pre_alloc_hook mm/slab.h:421 [inline] slab_alloc mm/slab.c:3378 [inline] __do_kmalloc mm/slab.c:3716 [inline] __kmalloc+0x2b9/0x760 mm/slab.c:3727 kmalloc_array include/linux/slab.h:631 [inline] kcalloc include/linux/slab.h:642 [inline] numa_crng_init drivers/char/random.c:798 [inline] crng_reseed+0x427/0x920 drivers/char/random.c:923 credit_entropy_bits+0x98d/0xa30 drivers/char/random.c:708 add_interrupt_randomness+0x494/0x860 drivers/char/random.c:1254 handle_irq_event_percpu+0xf9/0x1c0 kernel/irq/handle.c:191 handle_irq_event+0xa7/0x135 kernel/irq/handle.c:206 handle_edge_irq+0x20f/0x870 kernel/irq/chip.c:791 generic_handle_irq_desc include/linux/irqdesc.h:159 [inline] handle_irq+0x18c/0x2e7 arch/x86/kernel/irq_64.c:77 do_IRQ+0x78/0x190 arch/x86/kernel/irq.c:245 common_interrupt+0xf/0xf arch/x86/entry/entry_64.S:642 RIP: 0010:get_current arch/x86/include/asm/current.h:15 [inline] RIP: 0010:write_comp_data+0xa/0x70 kernel/kcov.c:121 RSP: 0018:ffff8801d021fa20 EFLAGS: 00000246 ORIG_RAX: ffffffffffffffd5 RAX: dffffc0000000000 RBX: 00007ffffffff000 RCX: ffffffff81a73dd5 RDX: 00007ffffffff000 RSI: ffffffffffffffff RDI: 0000000000000007 RBP: ffff8801d021fa30 R08: ffff8801c36f2180 R09: ffffed003b5c46c2 R10: 0000000000000003 R11: 0000000000000000 R12: ffffffff87fa1060 R13: 000000000000000a R14: ffff8801d021fba8 R15: 000055bd7d8edaf0 __might_fault+0x55/0x1e0 mm/memory.c:4548 _copy_from_user+0x30/0x150 lib/usercopy.c:10 copy_from_user include/linux/uaccess.h:147 [inline] get_fd_set fs/select.c:367 [inline] core_sys_select+0x3e2/0xb60 fs/select.c:647 kern_select+0x1b7/0x250 fs/select.c:696 __do_sys_select fs/select.c:705 [inline] __se_sys_select fs/select.c:702 [inline] __x64_sys_select+0xbe/0x150 fs/select.c:702 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7fa0997a2dd3 RSP: 002b:00007fff91aa07b8 EFLAGS: 00000246 ORIG_RAX: 0000000000000017 RAX: ffffffffffffffda RBX: 00007fff91aa0840 RCX: 00007fa0997a2dd3 RDX: 000055bd7d8edad0 RSI: 000055bd7d8edaf0 RDI: 000000000000000c RBP: 000055bd7d4318dc R08: 00007fff91aa07e0 R09: 0101010101010101 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fff91aa0848 R13: 0000000000000000 R14: 00007fff91aa0838 R15: 00007fff91aa083c random: crng init done