======================================================
WARNING: possible circular locking dependency detected
6.13.0-syzkaller-00918-g95ec54a420b8 #0 Not tainted
------------------------------------------------------
syz.2.124/6389 is trying to acquire lock:
ffff888024d0f290 (set->srcu){.+.+}-{0:0}, at: srcu_lock_sync include/linux/srcu.h:170 [inline]
ffff888024d0f290 (set->srcu){.+.+}-{0:0}, at: __synchronize_srcu+0x9d/0x400 kernel/rcu/srcutree.c:1418

but task is already holding lock:
ffff888025a70fa0 (&q->sysfs_lock){+.+.}-{4:4}, at: blk_mq_elv_switch_none block/blk-mq.c:4936 [inline]
ffff888025a70fa0 (&q->sysfs_lock){+.+.}-{4:4}, at: __blk_mq_update_nr_hw_queues block/blk-mq.c:5014 [inline]
ffff888025a70fa0 (&q->sysfs_lock){+.+.}-{4:4}, at: blk_mq_update_nr_hw_queues+0x34e/0x1910 block/blk-mq.c:5065

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #7 (&q->sysfs_lock){+.+.}-{4:4}:
       lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5849
       __mutex_lock_common kernel/locking/mutex.c:585 [inline]
       __mutex_lock+0x1ac/0xee0 kernel/locking/mutex.c:735
       blk_mq_elv_switch_none block/blk-mq.c:4936 [inline]
       __blk_mq_update_nr_hw_queues block/blk-mq.c:5014 [inline]
       blk_mq_update_nr_hw_queues+0x34e/0x1910 block/blk-mq.c:5065
       nbd_start_device+0x16c/0xaa0 drivers/block/nbd.c:1475
       nbd_start_device_ioctl drivers/block/nbd.c:1526 [inline]
       __nbd_ioctl drivers/block/nbd.c:1601 [inline]
       nbd_ioctl+0x5dc/0xf40 drivers/block/nbd.c:1641
       blkdev_ioctl+0x57d/0x6a0 block/ioctl.c:693
       vfs_ioctl fs/ioctl.c:51 [inline]
       __do_sys_ioctl fs/ioctl.c:906 [inline]
       __se_sys_ioctl+0xf5/0x170 fs/ioctl.c:892
       do_syscall_x64 arch/x86/entry/common.c:52 [inline]
       do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #6 (&q->q_usage_counter(io)#51){++++}-{0:0}:
       lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5849
       bio_queue_enter block/blk.h:77 [inline]
       blk_mq_submit_bio+0x14e1/0x25a0 block/blk-mq.c:3091
       __submit_bio+0x2cf/0x6a0 block/blk-core.c:629
       __submit_bio_noacct_mq block/blk-core.c:716 [inline]
       submit_bio_noacct_nocheck+0x4d3/0xe30 block/blk-core.c:745
       mpage_bio_submit_read fs/mpage.c:75 [inline]
       mpage_readahead+0x630/0x780 fs/mpage.c:377
       read_pages+0x176/0x750 mm/readahead.c:160
       page_cache_ra_unbounded+0x606/0x720 mm/readahead.c:295
       do_page_cache_ra mm/readahead.c:325 [inline]
       force_page_cache_ra mm/readahead.c:354 [inline]
       page_cache_sync_ra+0x3c5/0xad0 mm/readahead.c:566
       page_cache_sync_readahead include/linux/pagemap.h:1397 [inline]
       filemap_get_pages+0x605/0x2080 mm/filemap.c:2537
       filemap_read+0x452/0xf50 mm/filemap.c:2637
       blkdev_read_iter+0x2d8/0x430 block/fops.c:795
       new_sync_read fs/read_write.c:484 [inline]
       vfs_read+0x991/0xb70 fs/read_write.c:565
       ksys_read+0x18f/0x2b0 fs/read_write.c:708
       do_syscall_x64 arch/x86/entry/common.c:52 [inline]
       do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #5 (mapping.invalidate_lock#2){.+.+}-{4:4}:
       lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5849
       down_read+0xb1/0xa40 kernel/locking/rwsem.c:1524
       filemap_invalidate_lock_shared include/linux/fs.h:887 [inline]
       page_cache_ra_unbounded+0x142/0x720 mm/readahead.c:226
       do_async_mmap_readahead mm/filemap.c:3222 [inline]
       filemap_fault+0x818/0x1490 mm/filemap.c:3321
       __do_fault+0x135/0x390 mm/memory.c:4907
       do_read_fault mm/memory.c:5322 [inline]
       do_fault mm/memory.c:5456 [inline]
       do_pte_missing mm/memory.c:3979 [inline]
       handle_pte_fault+0x39eb/0x5ed0 mm/memory.c:5801
       __handle_mm_fault mm/memory.c:5944 [inline]
       handle_mm_fault+0x1053/0x1ad0 mm/memory.c:6112
       faultin_page mm/gup.c:1196 [inline]
       __get_user_pages+0x1c82/0x49e0 mm/gup.c:1494
       __get_user_pages_locked mm/gup.c:1760 [inline]
       get_dump_page+0x155/0x2f0 mm/gup.c:2278
       dump_user_range+0x14d/0x970 fs/coredump.c:943
       elf_core_dump+0x3e9f/0x4790 fs/binfmt_elf.c:2129
       do_coredump+0x242a/0x2ee0 fs/coredump.c:758
       get_signal+0x140b/0x1750 kernel/signal.c:3021
       arch_do_signal_or_restart+0x96/0x860 arch/x86/kernel/signal.c:337
       exit_to_user_mode_loop kernel/entry/common.c:111 [inline]
       exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline]
       irqentry_exit_to_user_mode+0x7e/0x250 kernel/entry/common.c:231
       exc_page_fault+0x590/0x8b0 arch/x86/mm/fault.c:1542
       asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623

-> #4 (&mm->mmap_lock){++++}-{4:4}:
       lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5849
       __might_fault+0xc6/0x120 mm/memory.c:6751
       _copy_from_iter+0x100/0x1c20 lib/iov_iter.c:259
       copy_from_iter include/linux/uio.h:228 [inline]
       copy_from_iter_full include/linux/uio.h:245 [inline]
       skb_do_copy_data_nocache include/net/sock.h:2193 [inline]
       skb_copy_to_page_nocache include/net/sock.h:2219 [inline]
       tcp_sendmsg_locked+0x18a5/0x4f30 net/ipv4/tcp.c:1222
       tcp_sendmsg+0x30/0x50 net/ipv4/tcp.c:1358
       sock_sendmsg_nosec net/socket.c:711 [inline]
       __sock_sendmsg+0x1a6/0x270 net/socket.c:726
       sock_write_iter+0x2d7/0x3f0 net/socket.c:1147
       new_sync_write fs/read_write.c:586 [inline]
       vfs_write+0xaeb/0xd30 fs/read_write.c:679
       ksys_write+0x18f/0x2b0 fs/read_write.c:731
       do_syscall_x64 arch/x86/entry/common.c:52 [inline]
       do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #3 (sk_lock-AF_INET){+.+.}-{0:0}:
       lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5849
       lock_sock_nested+0x48/0x100 net/core/sock.c:3625
       lock_sock include/net/sock.h:1623 [inline]
       inet_autobind net/ipv4/af_inet.c:178 [inline]
       inet_send_prepare net/ipv4/af_inet.c:837 [inline]
       inet_sendmsg+0x120/0x390 net/ipv4/af_inet.c:848
       sock_sendmsg_nosec net/socket.c:711 [inline]
       __sock_sendmsg+0x1a6/0x270 net/socket.c:726
       sock_sendmsg+0x134/0x200 net/socket.c:749
       __sock_xmit+0x219/0x4e0 drivers/block/nbd.c:574
       sock_xmit drivers/block/nbd.c:602 [inline]
       nbd_send_cmd+0x996/0x2110 drivers/block/nbd.c:712
       nbd_handle_cmd drivers/block/nbd.c:1174 [inline]
       nbd_queue_rq+0xcd5/0xef0 drivers/block/nbd.c:1204
       blk_mq_dispatch_rq_list+0xad3/0x19d0 block/blk-mq.c:2120
       __blk_mq_do_dispatch_sched block/blk-mq-sched.c:170 [inline]
       blk_mq_do_dispatch_sched block/blk-mq-sched.c:184 [inline]
       __blk_mq_sched_dispatch_requests+0xb8a/0x1840 block/blk-mq-sched.c:309
       blk_mq_sched_dispatch_requests+0xd6/0x190 block/blk-mq-sched.c:331
       blk_mq_run_hw_queue+0x354/0x500 block/blk-mq.c:2354
       blk_mq_flush_plug_list+0x118e/0x1870 block/blk-mq.c:2917
       __blk_flush_plug+0x420/0x500 block/blk-core.c:1214
       blk_finish_plug block/blk-core.c:1241 [inline]
       __submit_bio+0x54a/0x6a0 block/blk-core.c:643
       __submit_bio_noacct_mq block/blk-core.c:716 [inline]
       submit_bio_noacct_nocheck+0x4d3/0xe30 block/blk-core.c:745
       submit_bh fs/buffer.c:2819 [inline]
       block_read_full_folio+0x9b3/0xae0 fs/buffer.c:2446
       filemap_read_folio+0x148/0x3b0 mm/filemap.c:2357
       do_read_cache_folio+0x373/0x5b0 mm/filemap.c:3817
       read_mapping_folio include/linux/pagemap.h:1011 [inline]
       read_part_sector+0xb3/0x260 block/partitions/core.c:722
       adfspart_check_ICS+0xd9/0x9a0 block/partitions/acorn.c:360
       check_partition block/partitions/core.c:141 [inline]
       blk_add_partitions block/partitions/core.c:589 [inline]
       bdev_disk_changed+0x72c/0x13f0 block/partitions/core.c:693
       blkdev_get_whole+0x2d2/0x450 block/bdev.c:706
       bdev_open+0x2d4/0xc50 block/bdev.c:915
       blkdev_open+0x38e/0x4e0 block/fops.c:652
       do_dentry_open+0xbe1/0x1b70 fs/open.c:938
       vfs_open+0x3e/0x330 fs/open.c:1068
       do_open fs/namei.c:3828 [inline]
       path_openat+0x2c84/0x3590 fs/namei.c:3987
       do_filp_open+0x27f/0x4e0 fs/namei.c:4014
       do_sys_openat2+0x13e/0x1d0 fs/open.c:1395
       do_sys_open fs/open.c:1410 [inline]
       __do_sys_openat fs/open.c:1426 [inline]
       __se_sys_openat fs/open.c:1421 [inline]
       __x64_sys_openat+0x247/0x2a0 fs/open.c:1421
       do_syscall_x64 arch/x86/entry/common.c:52 [inline]
       do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #2 (&nsock->tx_lock){+.+.}-{4:4}:
       lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5849
       __mutex_lock_common kernel/locking/mutex.c:585 [inline]
       __mutex_lock+0x1ac/0xee0 kernel/locking/mutex.c:735
       nbd_handle_cmd drivers/block/nbd.c:1140 [inline]
       nbd_queue_rq+0x262/0xef0 drivers/block/nbd.c:1204
       blk_mq_dispatch_rq_list+0xad3/0x19d0 block/blk-mq.c:2120
       __blk_mq_do_dispatch_sched block/blk-mq-sched.c:170 [inline]
       blk_mq_do_dispatch_sched block/blk-mq-sched.c:184 [inline]
       __blk_mq_sched_dispatch_requests+0xb8a/0x1840 block/blk-mq-sched.c:309
       blk_mq_sched_dispatch_requests+0xd6/0x190 block/blk-mq-sched.c:331
       blk_mq_run_hw_queue+0x354/0x500 block/blk-mq.c:2354
       blk_mq_flush_plug_list+0x118e/0x1870 block/blk-mq.c:2917
       __blk_flush_plug+0x420/0x500 block/blk-core.c:1214
       blk_finish_plug block/blk-core.c:1241 [inline]
       __submit_bio+0x54a/0x6a0 block/blk-core.c:643
       __submit_bio_noacct_mq block/blk-core.c:716 [inline]
       submit_bio_noacct_nocheck+0x4d3/0xe30 block/blk-core.c:745
       submit_bh fs/buffer.c:2819 [inline]
       block_read_full_folio+0x9b3/0xae0 fs/buffer.c:2446
       filemap_read_folio+0x148/0x3b0 mm/filemap.c:2357
       do_read_cache_folio+0x373/0x5b0 mm/filemap.c:3817
       read_mapping_folio include/linux/pagemap.h:1011 [inline]
       read_part_sector+0xb3/0x260 block/partitions/core.c:722
       adfspart_check_ICS+0xd9/0x9a0 block/partitions/acorn.c:360
       check_partition block/partitions/core.c:141 [inline]
       blk_add_partitions block/partitions/core.c:589 [inline]
       bdev_disk_changed+0x72c/0x13f0 block/partitions/core.c:693
       blkdev_get_whole+0x2d2/0x450 block/bdev.c:706
       bdev_open+0x2d4/0xc50 block/bdev.c:915
       blkdev_open+0x38e/0x4e0 block/fops.c:652
       do_dentry_open+0xbe1/0x1b70 fs/open.c:938
       vfs_open+0x3e/0x330 fs/open.c:1068
       do_open fs/namei.c:3828 [inline]
       path_openat+0x2c84/0x3590 fs/namei.c:3987
       do_filp_open+0x27f/0x4e0 fs/namei.c:4014
       do_sys_openat2+0x13e/0x1d0 fs/open.c:1395
       do_sys_open fs/open.c:1410 [inline]
       __do_sys_openat fs/open.c:1426 [inline]
       __se_sys_openat fs/open.c:1421 [inline]
       __x64_sys_openat+0x247/0x2a0 fs/open.c:1421
       do_syscall_x64 arch/x86/entry/common.c:52 [inline]
       do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #1 (&cmd->lock){+.+.}-{4:4}:
       lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5849
       __mutex_lock_common kernel/locking/mutex.c:585 [inline]
       __mutex_lock+0x1ac/0xee0 kernel/locking/mutex.c:735
       nbd_queue_rq+0xcf/0xef0 drivers/block/nbd.c:1196
       blk_mq_dispatch_rq_list+0xad3/0x19d0 block/blk-mq.c:2120
       __blk_mq_do_dispatch_sched block/blk-mq-sched.c:170 [inline]
       blk_mq_do_dispatch_sched block/blk-mq-sched.c:184 [inline]
       __blk_mq_sched_dispatch_requests+0xb8a/0x1840 block/blk-mq-sched.c:309
       blk_mq_sched_dispatch_requests+0xd6/0x190 block/blk-mq-sched.c:331
       blk_mq_run_hw_queue+0x354/0x500 block/blk-mq.c:2354
       blk_mq_flush_plug_list+0x118e/0x1870 block/blk-mq.c:2917
       __blk_flush_plug+0x420/0x500 block/blk-core.c:1214
       blk_finish_plug block/blk-core.c:1241 [inline]
       __submit_bio+0x54a/0x6a0 block/blk-core.c:643
       __submit_bio_noacct_mq block/blk-core.c:716 [inline]
       submit_bio_noacct_nocheck+0x4d3/0xe30 block/blk-core.c:745
       submit_bh fs/buffer.c:2819 [inline]
       block_read_full_folio+0x9b3/0xae0 fs/buffer.c:2446
       filemap_read_folio+0x148/0x3b0 mm/filemap.c:2357
       do_read_cache_folio+0x373/0x5b0 mm/filemap.c:3817
       read_mapping_folio include/linux/pagemap.h:1011 [inline]
       read_part_sector+0xb3/0x260 block/partitions/core.c:722
       adfspart_check_ICS+0xd9/0x9a0 block/partitions/acorn.c:360
       check_partition block/partitions/core.c:141 [inline]
       blk_add_partitions block/partitions/core.c:589 [inline]
       bdev_disk_changed+0x72c/0x13f0 block/partitions/core.c:693
       blkdev_get_whole+0x2d2/0x450 block/bdev.c:706
       bdev_open+0x2d4/0xc50 block/bdev.c:915
       blkdev_open+0x38e/0x4e0 block/fops.c:652
       do_dentry_open+0xbe1/0x1b70 fs/open.c:938
       vfs_open+0x3e/0x330 fs/open.c:1068
       do_open fs/namei.c:3828 [inline]
       path_openat+0x2c84/0x3590 fs/namei.c:3987
       do_filp_open+0x27f/0x4e0 fs/namei.c:4014
       do_sys_openat2+0x13e/0x1d0 fs/open.c:1395
       do_sys_open fs/open.c:1410 [inline]
       __do_sys_openat fs/open.c:1426 [inline]
       __se_sys_openat fs/open.c:1421 [inline]
       __x64_sys_openat+0x247/0x2a0 fs/open.c:1421
       do_syscall_x64 arch/x86/entry/common.c:52 [inline]
       do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #0 (set->srcu){.+.+}-{0:0}:
       check_prev_add kernel/locking/lockdep.c:3161 [inline]
       check_prevs_add kernel/locking/lockdep.c:3280 [inline]
       validate_chain+0x18ef/0x5920 kernel/locking/lockdep.c:3904
       __lock_acquire+0x1397/0x2100 kernel/locking/lockdep.c:5226
       lock_sync+0x18b/0x310 kernel/locking/lockdep.c:5897
       srcu_lock_sync include/linux/srcu.h:170 [inline]
       __synchronize_srcu+0xb1/0x400 kernel/rcu/srcutree.c:1418
       elevator_disable+0x8c/0x3f0 block/elevator.c:657
       blk_mq_elv_switch_none block/blk-mq.c:4950 [inline]
       __blk_mq_update_nr_hw_queues block/blk-mq.c:5014 [inline]
       blk_mq_update_nr_hw_queues+0x599/0x1910 block/blk-mq.c:5065
       nbd_start_device+0x16c/0xaa0 drivers/block/nbd.c:1475
       nbd_start_device_ioctl drivers/block/nbd.c:1526 [inline]
       __nbd_ioctl drivers/block/nbd.c:1601 [inline]
       nbd_ioctl+0x5dc/0xf40 drivers/block/nbd.c:1641
       blkdev_ioctl+0x57d/0x6a0 block/ioctl.c:693
       vfs_ioctl fs/ioctl.c:51 [inline]
       __do_sys_ioctl fs/ioctl.c:906 [inline]
       __se_sys_ioctl+0xf5/0x170 fs/ioctl.c:892
       do_syscall_x64 arch/x86/entry/common.c:52 [inline]
       do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

other info that might help us debug this:

Chain exists of:
  set->srcu --> &q->q_usage_counter(io)#51 --> &q->sysfs_lock

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(&q->sysfs_lock);
                               lock(&q->q_usage_counter(io)#51);
                               lock(&q->sysfs_lock);
  sync(set->srcu);

 *** DEADLOCK ***

5 locks held by syz.2.124/6389:
 #0: ffff888025a6e998 (&nbd->config_lock){+.+.}-{4:4}, at: nbd_ioctl+0x13c/0xf40 drivers/block/nbd.c:1634
 #1: ffff888025a6e8d8 (&set->tag_list_lock){+.+.}-{4:4}, at: blk_mq_update_nr_hw_queues+0xa0/0x1910 block/blk-mq.c:5064
 #2: ffff888025a70a70 (&q->q_usage_counter(io)#51){++++}-{0:0}, at: __blk_mq_update_nr_hw_queues block/blk-mq.c:5007 [inline]
 #2: ffff888025a70a70 (&q->q_usage_counter(io)#51){++++}-{0:0}, at: blk_mq_update_nr_hw_queues+0x281/0x1910 block/blk-mq.c:5065
 #3: ffff888025a70aa8 (&q->q_usage_counter(queue)#35){+.+.}-{0:0}, at: __blk_mq_update_nr_hw_queues block/blk-mq.c:5007 [inline]
 #3: ffff888025a70aa8 (&q->q_usage_counter(queue)#35){+.+.}-{0:0}, at: blk_mq_update_nr_hw_queues+0x281/0x1910 block/blk-mq.c:5065
 #4: ffff888025a70fa0 (&q->sysfs_lock){+.+.}-{4:4}, at: blk_mq_elv_switch_none block/blk-mq.c:4936 [inline]
 #4: ffff888025a70fa0 (&q->sysfs_lock){+.+.}-{4:4}, at: __blk_mq_update_nr_hw_queues block/blk-mq.c:5014 [inline]
 #4: ffff888025a70fa0 (&q->sysfs_lock){+.+.}-{4:4}, at: blk_mq_update_nr_hw_queues+0x34e/0x1910 block/blk-mq.c:5065

stack backtrace:
CPU: 0 UID: 0 PID: 6389 Comm: syz.2.124 Not tainted 6.13.0-syzkaller-00918-g95ec54a420b8 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
 print_circular_bug+0x13a/0x1b0 kernel/locking/lockdep.c:2074
 check_noncircular+0x36a/0x4a0 kernel/locking/lockdep.c:2206
 check_prev_add kernel/locking/lockdep.c:3161 [inline]
 check_prevs_add kernel/locking/lockdep.c:3280 [inline]
 validate_chain+0x18ef/0x5920 kernel/locking/lockdep.c:3904
 __lock_acquire+0x1397/0x2100 kernel/locking/lockdep.c:5226
 lock_sync+0x18b/0x310 kernel/locking/lockdep.c:5897
 srcu_lock_sync include/linux/srcu.h:170 [inline]
 __synchronize_srcu+0xb1/0x400 kernel/rcu/srcutree.c:1418
 elevator_disable+0x8c/0x3f0 block/elevator.c:657
 blk_mq_elv_switch_none block/blk-mq.c:4950 [inline]
 __blk_mq_update_nr_hw_queues block/blk-mq.c:5014 [inline]
 blk_mq_update_nr_hw_queues+0x599/0x1910 block/blk-mq.c:5065
 nbd_start_device+0x16c/0xaa0 drivers/block/nbd.c:1475
 nbd_start_device_ioctl drivers/block/nbd.c:1526 [inline]
 __nbd_ioctl drivers/block/nbd.c:1601 [inline]
 nbd_ioctl+0x5dc/0xf40 drivers/block/nbd.c:1641
 blkdev_ioctl+0x57d/0x6a0 block/ioctl.c:693
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:906 [inline]
 __se_sys_ioctl+0xf5/0x170 fs/ioctl.c:892
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f6bfd785d29
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f6bfb5f6038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f6bfd975fa0 RCX: 00007f6bfd785d29
RDX: 0000000000000000 RSI: 000000000000ab03 RDI: 000000000000000d
RBP: 00007f6bfd801b08 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f6bfd975fa0 R15: 00007ffc85e1ade8
 </TASK>
block nbd2: shutting down sockets