================================ WARNING: inconsistent lock state 4.17.0-rc2+ #18 Not tainted -------------------------------- inconsistent {HARDIRQ-ON-W} -> {IN-HARDIRQ-W} usage. sshd/4492 [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: 548652 hardirqs last enabled at (548651): [] kmem_cache_free+0xa0/0x2d0 mm/slab.c:3757 hardirqs last disabled at (548652): [] interrupt_entry+0xb5/0xf0 arch/x86/entry/entry_64.S:625 softirqs last enabled at (548642): [] spin_unlock_bh include/linux/spinlock.h:355 [inline] softirqs last enabled at (548642): [] __release_sock+0xcb/0x3a0 net/core/sock.c:2331 softirqs last disabled at (548640): [] spin_lock_bh include/linux/spinlock.h:315 [inline] softirqs last disabled at (548640): [] 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 *** 1 lock held by sshd/4492: #0: (ptrval) (sk_lock-AF_INET){+.+.}, at: lock_sock include/net/sock.h:1469 [inline] #0: (ptrval) (sk_lock-AF_INET){+.+.}, at: tcp_sendmsg+0x21/0x50 net/ipv4/tcp.c:1445 stack backtrace: CPU: 1 PID: 4492 Comm: sshd Not tainted 4.17.0-rc2+ #18 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:tcp_clean_rtx_queue net/ipv4/tcp_input.c:3161 [inline] RIP: 0010:tcp_ack+0x246f/0x5510 net/ipv4/tcp_input.c:3621 RSP: 0018:ffff8801ae28f330 EFLAGS: 00000202 ORIG_RAX: ffffffffffffffd8 RAX: 0000000000000007 RBX: 0000000000000000 RCX: ffffffff864b8549 RDX: 0000000000000000 RSI: ffff8801cd4f1344 RDI: 0000000000000005 RBP: ffff8801ae28f6b8 R08: ffff8801ae5f2040 R09: ffff8801ae28f648 R10: ffffed003b5e46c2 R11: ffff8801daf23613 R12: ffff8801cfc09000 R13: 0000000000000004 R14: ffff8801cd4f114c R15: ffff8801cd4f0a80 tcp_rcv_established+0x1419/0x2010 net/ipv4/tcp_input.c:5417 tcp_v4_do_rcv+0x615/0x8c0 net/ipv4/tcp_ipv4.c:1477 sk_backlog_rcv include/net/sock.h:909 [inline] __release_sock+0x12f/0x3a0 net/core/sock.c:2338 release_sock+0xa4/0x2b0 net/core/sock.c:2853 tcp_sendmsg+0x3a/0x50 net/ipv4/tcp.c:1447 inet_sendmsg+0x19f/0x690 net/ipv4/af_inet.c:798 sock_sendmsg_nosec net/socket.c:629 [inline] sock_sendmsg+0xd5/0x120 net/socket.c:639 sock_write_iter+0x35a/0x5a0 net/socket.c:908 call_write_iter include/linux/fs.h:1784 [inline] new_sync_write fs/read_write.c:474 [inline] __vfs_write+0x64d/0x960 fs/read_write.c:487 vfs_write+0x1f8/0x560 fs/read_write.c:549 ksys_write+0xf9/0x250 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+0x1b1/0x800 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7f12be6d8370 RSP: 002b:00007ffc5685fcf8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 0000000000000038 RCX: 00007f12be6d8370 RDX: 0000000000000038 RSI: 000055bef463c420 RDI: 0000000000000003 RBP: 000055bef463c420 R08: 0000000000000001 R09: 727020676e697475 R10: 78650a6d6172676f R11: 0000000000000246 R12: 00007ffc5685fd5c R13: 000055bef26c6fb4 R14: 0000000000000028 R15: 000055bef26c8ca0 BUG: sleeping function called from invalid context at mm/slab.h:421 in_atomic(): 1, irqs_disabled(): 1, pid: 4492, name: sshd INFO: lockdep is turned off. irq event stamp: 548652 hardirqs last enabled at (548651): [] kmem_cache_free+0xa0/0x2d0 mm/slab.c:3757 hardirqs last disabled at (548652): [] interrupt_entry+0xb5/0xf0 arch/x86/entry/entry_64.S:625 softirqs last enabled at (548642): [] spin_unlock_bh include/linux/spinlock.h:355 [inline] softirqs last enabled at (548642): [] __release_sock+0xcb/0x3a0 net/core/sock.c:2331 softirqs last disabled at (548640): [] spin_lock_bh include/linux/spinlock.h:315 [inline] softirqs last disabled at (548640): [] release_sock+0x74/0x2b0 net/core/sock.c:2851 CPU: 1 PID: 4492 Comm: sshd Not tainted 4.17.0-rc2+ #18 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:tcp_clean_rtx_queue net/ipv4/tcp_input.c:3161 [inline] RIP: 0010:tcp_ack+0x246f/0x5510 net/ipv4/tcp_input.c:3621 RSP: 0018:ffff8801ae28f330 EFLAGS: 00000202 ORIG_RAX: ffffffffffffffd8 RAX: 0000000000000007 RBX: 0000000000000000 RCX: ffffffff864b8549 RDX: 0000000000000000 RSI: ffff8801cd4f1344 RDI: 0000000000000005 RBP: ffff8801ae28f6b8 R08: ffff8801ae5f2040 R09: ffff8801ae28f648 R10: ffffed003b5e46c2 R11: ffff8801daf23613 R12: ffff8801cfc09000 R13: 0000000000000004 R14: ffff8801cd4f114c R15: ffff8801cd4f0a80 tcp_rcv_established+0x1419/0x2010 net/ipv4/tcp_input.c:5417 tcp_v4_do_rcv+0x615/0x8c0 net/ipv4/tcp_ipv4.c:1477 sk_backlog_rcv include/net/sock.h:909 [inline] __release_sock+0x12f/0x3a0 net/core/sock.c:2338 release_sock+0xa4/0x2b0 net/core/sock.c:2853 tcp_sendmsg+0x3a/0x50 net/ipv4/tcp.c:1447 inet_sendmsg+0x19f/0x690 net/ipv4/af_inet.c:798 sock_sendmsg_nosec net/socket.c:629 [inline] sock_sendmsg+0xd5/0x120 net/socket.c:639 sock_write_iter+0x35a/0x5a0 net/socket.c:908 call_write_iter include/linux/fs.h:1784 [inline] new_sync_write fs/read_write.c:474 [inline] __vfs_write+0x64d/0x960 fs/read_write.c:487 vfs_write+0x1f8/0x560 fs/read_write.c:549 ksys_write+0xf9/0x250 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+0x1b1/0x800 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7f12be6d8370 RSP: 002b:00007ffc5685fcf8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 0000000000000038 RCX: 00007f12be6d8370 RDX: 0000000000000038 RSI: 000055bef463c420 RDI: 0000000000000003 RBP: 000055bef463c420 R08: 0000000000000001 R09: 727020676e697475 R10: 78650a6d6172676f R11: 0000000000000246 R12: 00007ffc5685fd5c R13: 000055bef26c6fb4 R14: 0000000000000028 R15: 000055bef26c8ca0 random: crng init done