random: sshd: uninitialized urandom read (32 bytes read)
random: sshd: uninitialized urandom read (32 bytes read)
random: sshd: uninitialized urandom read (32 bytes read)
=============================
WARNING: suspicious RCU usage
4.17.0-rc2+ #16 Not tainted
-----------------------------
include/linux/rcupdate.h:304 Illegal context switch in RCU read-side critical section!
other info that might help us debug this:
rcu_scheduler_active = 2, debug_locks = 1
7 locks held by kworker/u4:3/825:
#0: (ptrval) ((wq_completion)"writeback"){+.+.}, at: __write_once_size include/linux/compiler.h:215 [inline]
#0: (ptrval) ((wq_completion)"writeback"){+.+.}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline]
#0: (ptrval) ((wq_completion)"writeback"){+.+.}, at: atomic64_set include/asm-generic/atomic-instrumented.h:40 [inline]
#0: (ptrval) ((wq_completion)"writeback"){+.+.}, at: atomic_long_set include/asm-generic/atomic-long.h:57 [inline]
#0: (ptrval) ((wq_completion)"writeback"){+.+.}, at: set_work_data kernel/workqueue.c:617 [inline]
#0: (ptrval) ((wq_completion)"writeback"){+.+.}, at: set_work_pool_and_clear_pending kernel/workqueue.c:644 [inline]
#0: (ptrval) ((wq_completion)"writeback"){+.+.}, at: process_one_work+0xaef/0x1b50 kernel/workqueue.c:2116
#1: (ptrval) ((work_completion)(&(&wb->dwork)->work)){+.+.}, at: process_one_work+0xb46/0x1b50 kernel/workqueue.c:2120
#2: (ptrval) (&type->s_umount_key#29){++++}, at: trylock_super+0x22/0x110 fs/super.c:399
#3: (ptrval) (&sbi->s_journal_flag_rwsem){.+.+}, at: do_writepages+0x9a/0x1a0 mm/page-writeback.c:2341
#4: (ptrval) (jbd2_handle){.+.+}, at: start_this_handle+0x581/0x1250 fs/jbd2/transaction.c:385
#5: (ptrval) (rcu_read_lock){....}, at: blk_rq_is_passthrough include/linux/blkdev.h:297 [inline]
#5: (ptrval) (rcu_read_lock){....}, at: blk_do_io_stat block/blk.h:300 [inline]
#5: (ptrval) (rcu_read_lock){....}, at: blk_account_io_start+0x166/0xde0 block/blk-core.c:2785
#6: (ptrval) (rcu_read_lock){....}, at: arch_static_branch arch/x86/include/asm/jump_label.h:36 [inline]
#6: (ptrval) (rcu_read_lock){....}, at: static_key_false include/linux/jump_label.h:142 [inline]
#6: (ptrval) (rcu_read_lock){....}, at: netif_receive_skb_internal+0xa2/0x7b0 net/core/dev.c:4705
stack backtrace:
CPU: 1 PID: 825 Comm: kworker/u4:3 Not tainted 4.17.0-rc2+ #16
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: writeback wb_workfn (flush-8:0)
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x1b9/0x294 lib/dump_stack.c:113
lockdep_rcu_suspicious+0x14a/0x153 kernel/locking/lockdep.c:4592
rcu_preempt_sleep_check include/linux/rcupdate.h:303 [inline]
___might_sleep+0x26d/0x320 kernel/sched/core.c:6153
__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:arch_local_irq_restore arch/x86/include/asm/paravirt.h:783 [inline]
RIP: 0010:slab_alloc mm/slab.c:3385 [inline]
RIP: 0010:kmem_cache_alloc+0x283/0x760 mm/slab.c:3552
RSP: 0018:ffff8801daf06800 EFLAGS: 00000286 ORIG_RAX: ffffffffffffffd9
RAX: 0000000000000007 RBX: 0000000001080020 RCX: 1ffff1003afae1c7
RDX: 0000000000000000 RSI: ffff8801d7d70e68 RDI: 0000000000000286
RBP: ffff8801daf06870 R08: ffff8801d7d70d78 R09: 0000000000000002
R10: ffff8801d7d70540 R11: 0000000000000000 R12: ffff8801d8a7adc0
R13: ffff8801d9a11080 R14: ffff8801d9a11080 R15: 0000000001080020
skb_clone+0x1ed/0x4f0 net/core/skbuff.c:1282
skb_share_check include/linux/skbuff.h:1514 [inline]
packet_rcv_spkt+0x59a/0x730 net/packet/af_packet.c:1848
deliver_skb net/core/dev.c:1924 [inline]
deliver_ptype_list_skb net/core/dev.c:1939 [inline]
__netif_receive_skb_core+0x1435/0x3630 net/core/dev.c:4575
__netif_receive_skb+0x2c/0x1e0 net/core/dev.c:4657
netif_receive_skb_internal+0x126/0x7b0 net/core/dev.c:4731
napi_skb_finish net/core/dev.c:5093 [inline]
napi_gro_receive+0x44d/0x5a0 net/core/dev.c:5124
receive_buf+0xc59/0x2750 drivers/net/virtio_net.c:946
virtnet_receive drivers/net/virtio_net.c:1201 [inline]
virtnet_poll+0x3c8/0xdb5 drivers/net/virtio_net.c:1283
napi_poll net/core/dev.c:5735 [inline]
net_rx_action+0x7b7/0x1930 net/core/dev.c:5801
__do_softirq+0x2e0/0xaf5 kernel/softirq.c:285
invoke_softirq kernel/softirq.c:365 [inline]
irq_exit+0x1d1/0x200 kernel/softirq.c:405
exiting_irq arch/x86/include/asm/apic.h:525 [inline]
do_IRQ+0xf1/0x190 arch/x86/kernel/irq.c:257
common_interrupt+0xf/0xf arch/x86/entry/entry_64.S:642
RIP: 0010:__sbitmap_for_each_set include/linux/sbitmap.h:245 [inline]
RIP: 0010:sbitmap_for_each_set include/linux/sbitmap.h:284 [inline]
RIP: 0010:bt_for_each block/blk-mq-tag.c:237 [inline]
RIP: 0010:blk_mq_queue_tag_busy_iter+0x2ee/0x9e0 block/blk-mq-tag.c:350
RSP: 0018:ffff8801d7d7d118 EFLAGS: 00000287 ORIG_RAX: ffffffffffffffd9
RAX: 0000000000000000 RBX: 0000000000000080 RCX: ffffffff83421769
RDX: 0000000000000080 RSI: 0000000000000031 RDI: 0000000000000004
RBP: ffff8801d7d7d278 R08: ffff8801d7d70540 R09: ffffed003b5e46c2
R10: 0000000000000003 R11: 0000000000000006 R12: 0000000000002000
R13: 0000000000000031 R14: ffff8801d20c3a00 R15: dffffc0000000000
blk_mq_in_flight+0x129/0x1b0 block/blk-mq.c:118
part_in_flight+0xdf/0x5a0 block/genhd.c:72
part_round_stats+0x1e3/0x770 block/blk-core.c:1728
blk_account_io_start+0x732/0xde0 block/blk-core.c:2807
blk_mq_bio_to_request+0x46e/0x930 block/blk-mq.c:1700
blk_mq_make_request+0x11bb/0x25c0 block/blk-mq.c:1885
generic_make_request+0x795/0x1510 block/blk-core.c:2459
submit_bio+0xba/0x460 block/blk-core.c:2567
ext4_io_submit+0x190/0x220 fs/ext4/page-io.c:356
io_submit_add_bh fs/ext4/page-io.c:396 [inline]
ext4_bio_write_page+0x7de/0x1534 fs/ext4/page-io.c:506
mpage_submit_page+0x15d/0x270 fs/ext4/inode.c:2209
mpage_map_and_submit_buffers+0x52e/0x9b0 fs/ext4/inode.c:2406
mpage_map_and_submit_extent fs/ext4/inode.c:2544 [inline]
ext4_writepages+0x262b/0x4030 fs/ext4/inode.c:2856
do_writepages+0x9a/0x1a0 mm/page-writeback.c:2341
__writeback_single_inode+0x1e4/0x15c0 fs/fs-writeback.c:1323
writeback_sb_inodes+0x6f0/0x11a0 fs/fs-writeback.c:1587
__writeback_inodes_wb+0x1b0/0x320 fs/fs-writeback.c:1656
wb_writeback+0x9e4/0xf50 fs/fs-writeback.c:1765
wb_check_background_flush fs/fs-writeback.c:1833 [inline]
wb_do_writeback fs/fs-writeback.c:1921 [inline]
wb_workfn+0xd2f/0x1770 fs/fs-writeback.c:1949
process_one_work+0xc1e/0x1b50 kernel/workqueue.c:2145
worker_thread+0x1cc/0x1440 kernel/workqueue.c:2279
kthread+0x345/0x410 kernel/kthread.c:238
ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:412
BUG: sleeping function called from invalid context at mm/slab.h:421
in_atomic(): 1, irqs_disabled(): 1, pid: 825, name: kworker/u4:3
7 locks held by kworker/u4:3/825:
#0: (ptrval) ((wq_completion)"writeback"){+.+.}, at: __write_once_size include/linux/compiler.h:215 [inline]
#0: (ptrval) ((wq_completion)"writeback"){+.+.}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline]
#0: (ptrval) ((wq_completion)"writeback"){+.+.}, at: atomic64_set include/asm-generic/atomic-instrumented.h:40 [inline]
#0: (ptrval) ((wq_completion)"writeback"){+.+.}, at: atomic_long_set include/asm-generic/atomic-long.h:57 [inline]
#0: (ptrval) ((wq_completion)"writeback"){+.+.}, at: set_work_data kernel/workqueue.c:617 [inline]
#0: (ptrval) ((wq_completion)"writeback"){+.+.}, at: set_work_pool_and_clear_pending kernel/workqueue.c:644 [inline]
#0: (ptrval) ((wq_completion)"writeback"){+.+.}, at: process_one_work+0xaef/0x1b50 kernel/workqueue.c:2116
#1: (ptrval) ((work_completion)(&(&wb->dwork)->work)){+.+.}, at: process_one_work+0xb46/0x1b50 kernel/workqueue.c:2120
#2: (ptrval) (&type->s_umount_key#29){++++}, at: trylock_super+0x22/0x110 fs/super.c:399
#3: (ptrval) (&sbi->s_journal_flag_rwsem){.+.+}, at: do_writepages+0x9a/0x1a0 mm/page-writeback.c:2341
#4: (ptrval) (jbd2_handle){.+.+}, at: start_this_handle+0x581/0x1250 fs/jbd2/transaction.c:385
#5: (ptrval) (rcu_read_lock){....}, at: blk_rq_is_passthrough include/linux/blkdev.h:297 [inline]
#5: (ptrval) (rcu_read_lock){....}, at: blk_do_io_stat block/blk.h:300 [inline]
#5: (ptrval) (rcu_read_lock){....}, at: blk_account_io_start+0x166/0xde0 block/blk-core.c:2785
#6: (ptrval) (rcu_read_lock){....}, at: arch_static_branch arch/x86/include/asm/jump_label.h:36 [inline]
#6: (ptrval) (rcu_read_lock){....}, at: static_key_false include/linux/jump_label.h:142 [inline]
#6: (ptrval) (rcu_read_lock){....}, at: netif_receive_skb_internal+0xa2/0x7b0 net/core/dev.c:4705
irq event stamp: 97961
hardirqs last enabled at (97960): [] slab_alloc mm/slab.c:3385 [inline]
hardirqs last enabled at (97960): [] kmem_cache_alloc+0x26f/0x760 mm/slab.c:3552
hardirqs last disabled at (97961): [] interrupt_entry+0xb5/0xf0 arch/x86/entry/entry_64.S:625
softirqs last enabled at (97094): [] __do_softirq+0x778/0xaf5 kernel/softirq.c:311
softirqs last disabled at (97099): [] invoke_softirq kernel/softirq.c:365 [inline]
softirqs last disabled at (97099): [] irq_exit+0x1d1/0x200 kernel/softirq.c:405
CPU: 1 PID: 825 Comm: kworker/u4:3 Not tainted 4.17.0-rc2+ #16
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: writeback wb_workfn (flush-8:0)
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:arch_local_irq_restore arch/x86/include/asm/paravirt.h:783 [inline]
RIP: 0010:slab_alloc mm/slab.c:3385 [inline]
RIP: 0010:kmem_cache_alloc+0x283/0x760 mm/slab.c:3552
RSP: 0018:ffff8801daf06800 EFLAGS: 00000286 ORIG_RAX: ffffffffffffffd9
RAX: 0000000000000007 RBX: 0000000001080020 RCX: 1ffff1003afae1c7
RDX: 0000000000000000 RSI: ffff8801d7d70e68 RDI: 0000000000000286
RBP: ffff8801daf06870 R08: ffff8801d7d70d78 R09: 0000000000000002
R10: ffff8801d7d70540 R11: 0000000000000000 R12: ffff8801d8a7adc0
R13: ffff8801d9a11080 R14: ffff8801d9a11080 R15: 0000000001080020
skb_clone+0x1ed/0x4f0 net/core/skbuff.c:1282
skb_share_check include/linux/skbuff.h:1514 [inline]
packet_rcv_spkt+0x59a/0x730 net/packet/af_packet.c:1848
deliver_skb net/core/dev.c:1924 [inline]
deliver_ptype_list_skb net/core/dev.c:1939 [inline]
__netif_receive_skb_core+0x1435/0x3630 net/core/dev.c:4575
__netif_receive_skb+0x2c/0x1e0 net/core/dev.c:4657
netif_receive_skb_internal+0x126/0x7b0 net/core/dev.c:4731
napi_skb_finish net/core/dev.c:5093 [inline]
napi_gro_receive+0x44d/0x5a0 net/core/dev.c:5124
receive_buf+0xc59/0x2750 drivers/net/virtio_net.c:946
virtnet_receive drivers/net/virtio_net.c:1201 [inline]
virtnet_poll+0x3c8/0xdb5 drivers/net/virtio_net.c:1283
napi_poll net/core/dev.c:5735 [inline]
net_rx_action+0x7b7/0x1930 net/core/dev.c:5801
__do_softirq+0x2e0/0xaf5 kernel/softirq.c:285
invoke_softirq kernel/softirq.c:365 [inline]
irq_exit+0x1d1/0x200 kernel/softirq.c:405
exiting_irq arch/x86/include/asm/apic.h:525 [inline]
do_IRQ+0xf1/0x190 arch/x86/kernel/irq.c:257
common_interrupt+0xf/0xf arch/x86/entry/entry_64.S:642
RIP: 0010:__sbitmap_for_each_set include/linux/sbitmap.h:245 [inline]
RIP: 0010:sbitmap_for_each_set include/linux/sbitmap.h:284 [inline]
RIP: 0010:bt_for_each block/blk-mq-tag.c:237 [inline]
RIP: 0010:blk_mq_queue_tag_busy_iter+0x2ee/0x9e0 block/blk-mq-tag.c:350
RSP: 0018:ffff8801d7d7d118 EFLAGS: 00000287 ORIG_RAX: ffffffffffffffd9
RAX: 0000000000000000 RBX: 0000000000000080 RCX: ffffffff83421769
RDX: 0000000000000080 RSI: 0000000000000031 RDI: 0000000000000004
RBP: ffff8801d7d7d278 R08: ffff8801d7d70540 R09: ffffed003b5e46c2
R10: 0000000000000003 R11: 0000000000000006 R12: 0000000000002000
R13: 0000000000000031 R14: ffff8801d20c3a00 R15: dffffc0000000000
blk_mq_in_flight+0x129/0x1b0 block/blk-mq.c:118
part_in_flight+0xdf/0x5a0 block/genhd.c:72
part_round_stats+0x1e3/0x770 block/blk-core.c:1728
blk_account_io_start+0x732/0xde0 block/blk-core.c:2807
blk_mq_bio_to_request+0x46e/0x930 block/blk-mq.c:1700
blk_mq_make_request+0x11bb/0x25c0 block/blk-mq.c:1885
generic_make_request+0x795/0x1510 block/blk-core.c:2459
submit_bio+0xba/0x460 block/blk-core.c:2567
ext4_io_submit+0x190/0x220 fs/ext4/page-io.c:356
io_submit_add_bh fs/ext4/page-io.c:396 [inline]
ext4_bio_write_page+0x7de/0x1534 fs/ext4/page-io.c:506
mpage_submit_page+0x15d/0x270 fs/ext4/inode.c:2209
mpage_map_and_submit_buffers+0x52e/0x9b0 fs/ext4/inode.c:2406
mpage_map_and_submit_extent fs/ext4/inode.c:2544 [inline]
ext4_writepages+0x262b/0x4030 fs/ext4/inode.c:2856
do_writepages+0x9a/0x1a0 mm/page-writeback.c:2341
__writeback_single_inode+0x1e4/0x15c0 fs/fs-writeback.c:1323
writeback_sb_inodes+0x6f0/0x11a0 fs/fs-writeback.c:1587
__writeback_inodes_wb+0x1b0/0x320 fs/fs-writeback.c:1656
wb_writeback+0x9e4/0xf50 fs/fs-writeback.c:1765
wb_check_background_flush fs/fs-writeback.c:1833 [inline]
wb_do_writeback fs/fs-writeback.c:1921 [inline]
wb_workfn+0xd2f/0x1770 fs/fs-writeback.c:1949
process_one_work+0xc1e/0x1b50 kernel/workqueue.c:2145
worker_thread+0x1cc/0x1440 kernel/workqueue.c:2279
kthread+0x345/0x410 kernel/kthread.c:238
ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:412
random: crng init done