blktests failures with v6.18-rc1 kernel
Shinichiro Kawasaki
shinichiro.kawasaki at wdc.com
Sat Oct 18 04:26:23 PDT 2025
Hi all,
I ran the latest blktests (git hash: 1673a2ba4d37) with the v6.18-rc1 kernel. I
observed 4 failures listed below. Comparing with the previous report with the
v6.17 kernel [1], 2 failures are newly reported (#3 and #4), but they are not
caused by the kernel changes between v6.17 and v6.18-rc1. These new failures
are caused by lockdep WARNs, and were hidden by other lockdep WARNs.
[1] https://lore.kernel.org/linux-block/3bbujxlhhzxufnihiyhssmknscdcqt7igyvzbhwf3sxdgbruma@kw5cf6u5npan/
List of failures
================
#1: nvme/005,063 (tcp transport)
#2: nvme/041 (fc transport)
#3: nvme/014,057,058 (new)
#4: nbd/002 (new)
Failure description
===================
#1: nvme/005,063 (tcp transport)
The test case nvme/005 and 063 fail for tcp transport due to the lockdep
WARN related to the three locks q->q_usage_counter, q->elevator_lock and
set->srcu. Refer to the nvme/063 failure report for v6.16-rc1 kernel [2].
[2] https://lore.kernel.org/linux-block/4fdm37so3o4xricdgfosgmohn63aa7wj3ua4e5vpihoamwg3ui@fq42f5q5t5ic/
#2: nvme/041 (fc transport)
The test case nvme/041 fails for fc transport. Refer to the report for the
v6.12 kernel [3]. Daniel posted the fix patch series [4] (Thanks!).
[3] https://lore.kernel.org/linux-nvme/6crydkodszx5vq4ieox3jjpwkxtu7mhbohypy24awlo5w7f4k6@to3dcng24rd4/
[4] https://lore.kernel.org/linux-nvme/20250829-nvme-fc-sync-v3-0-d69c87e63aee@kernel.org/
#3: nvme/014,057,058
The test cases nvme/014, 057 and 058 fail due to the lockdep WARN related
to disk->open_mutex, kblocked workqueue completion and nvme partition
scan_work completion. Yi Zhang had reported it in Jun/2025 [5]. And it was
observed during blktests CI this week [6]. The failure looks independent of
transport type.
[5] https://lore.kernel.org/linux-block/CAHj4cs8mJ+R_GmQm9R8ebResKAWUE8kF5+_WVg0v8zndmqd6BQ@mail.gmail.com/
[6] https://lore.kernel.org/linux-block/oeyzci6ffshpukpfqgztsdeke5ost5hzsuz4rrsjfmvpqcevax@5nhnwbkzbrpa/
#4: nbd/002
The test case nbd/002 fails due to the lockdep WARN related to
mm->mmap_lock, sk_lock-AF_INET6 and fs_reclaim [7]. I observed this
failure symptom with v6.17 kernel also.
[7]
[ 1580.296055] [ T80776] run blktests nbd/002 at 2025-10-18 19:23:26
[ 1580.464349] [ T80797] nbd0: detected capacity change from 0 to 20971520
[ 1580.533605] [ T80798] ======================================================
[ 1580.535626] [ T80798] WARNING: possible circular locking dependency detected
[ 1580.537820] [ T80798] 6.18.0-rc1 #100 Not tainted
[ 1580.539720] [ T80798] ------------------------------------------------------
[ 1580.541870] [ T80798] nbd-server/80798 is trying to acquire lock:
[ 1580.543950] [ T80798] ffffffff8c68d080 (fs_reclaim){+.+.}-{0:0}, at: __alloc_frozen_pages_noprof+0x1c0/0x650
[ 1580.546179] [ T80798]
but task is already holding lock:
[ 1580.548738] [ T80798] ffff8881357a62a0 (&mm->mmap_lock){++++}-{4:4}, at: lock_mm_and_find_vma+0x2d/0xc80
[ 1580.550307] [ T80798]
which lock already depends on the new lock.
[ 1580.553212] [ T80798]
the existing dependency chain (in reverse order) is:
[ 1580.554958] [ T80798]
-> #6 (&mm->mmap_lock){++++}-{4:4}:
[ 1580.556639] [ T80798] __might_fault+0xc1/0x140
[ 1580.557656] [ T80798] _copy_from_user+0x22/0xa0
[ 1580.558541] [ T80798] copy_from_sockptr_offset.constprop.0+0x12e/0x180
[ 1580.559506] [ T80798] do_ipv6_setsockopt+0xa61/0x3770
[ 1580.560440] [ T80798] ipv6_setsockopt+0x79/0xf0
[ 1580.561336] [ T80798] do_sock_setsockopt+0x156/0x380
[ 1580.562290] [ T80798] __sys_setsockopt+0xe0/0x150
[ 1580.563238] [ T80798] __x64_sys_setsockopt+0xb9/0x180
[ 1580.564127] [ T80798] do_syscall_64+0x94/0x6c0
[ 1580.564977] [ T80798] entry_SYSCALL_64_after_hwframe+0x76/0x7e
[ 1580.565901] [ T80798]
-> #5 (sk_lock-AF_INET6){+.+.}-{0:0}:
[ 1580.567303] [ T80798] lock_sock_nested+0x32/0xf0
[ 1580.568081] [ T80798] tcp_recvmsg+0xdb/0x530
[ 1580.568822] [ T80798] inet6_recvmsg+0xfe/0x640
[ 1580.569590] [ T80798] sock_recvmsg+0xdc/0x220
[ 1580.570368] [ T80798] __sock_xmit+0x287/0x440 [nbd]
[ 1580.571163] [ T80798] nbd_handle_reply+0x6be/0xd40 [nbd]
[ 1580.571957] [ T80798] recv_work+0x21a/0x760 [nbd]
[ 1580.572673] [ T80798] process_one_work+0x868/0x14b0
[ 1580.573428] [ T80798] worker_thread+0x5ee/0xfd0
[ 1580.574199] [ T80798] kthread+0x3af/0x770
[ 1580.574911] [ T80798] ret_from_fork+0x450/0x580
[ 1580.575599] [ T80798] ret_from_fork_asm+0x1a/0x30
[ 1580.576390] [ T80798]
-> #4 (&cmd->lock){+.+.}-{4:4}:
[ 1580.577713] [ T80798] __mutex_lock+0x1b2/0x22c0
[ 1580.578451] [ T80798] nbd_queue_rq+0xa9/0xe50 [nbd]
[ 1580.579212] [ T80798] blk_mq_dispatch_rq_list+0x39b/0x22f0
[ 1580.579979] [ T80798] __blk_mq_sched_dispatch_requests+0xaa4/0x1500
[ 1580.580820] [ T80798] blk_mq_sched_dispatch_requests+0xa8/0x150
[ 1580.581628] [ T80798] blk_mq_run_hw_queue+0x1c9/0x520
[ 1580.582360] [ T80798] blk_mq_dispatch_list+0x4e0/0x1310
[ 1580.583103] [ T80798] blk_mq_flush_plug_list+0xf8/0x680
[ 1580.583852] [ T80798] __blk_flush_plug+0x26a/0x4e0
[ 1580.584558] [ T80798] __submit_bio+0x4d9/0x700
[ 1580.585275] [ T80798] submit_bio_noacct_nocheck+0x3d4/0xaf0
[ 1580.586084] [ T80798] block_read_full_folio+0x3db/0x780
[ 1580.586848] [ T80798] filemap_read_folio+0xa2/0x200
[ 1580.587556] [ T80798] do_read_cache_folio+0x1ac/0x420
[ 1580.588350] [ T80798] read_part_sector+0xb9/0x2c0
[ 1580.589054] [ T80798] read_lba+0x183/0x2f0
[ 1580.589729] [ T80798] efi_partition+0x248/0x2000
[ 1580.590425] [ T80798] bdev_disk_changed+0x592/0x930
[ 1580.591221] [ T80798] blkdev_get_whole+0x144/0x200
[ 1580.591985] [ T80798] bdev_open+0x610/0xc60
[ 1580.592667] [ T80798] blkdev_open+0x2a7/0x450
[ 1580.593340] [ T80798] do_dentry_open+0x799/0x10d0
[ 1580.594198] [ T80798] vfs_open+0x76/0x440
[ 1580.594895] [ T80798] path_openat+0x1a52/0x2ac0
[ 1580.595567] [ T80798] do_filp_open+0x1c1/0x460
[ 1580.596240] [ T80798] do_sys_openat2+0xef/0x180
[ 1580.596911] [ T80798] __x64_sys_openat+0x10a/0x210
[ 1580.597627] [ T80798] do_syscall_64+0x94/0x6c0
[ 1580.598280] [ T80798] entry_SYSCALL_64_after_hwframe+0x76/0x7e
[ 1580.599003] [ T80798]
-> #3 (set->srcu){.+.+}-{0:0}:
[ 1580.600175] [ T80798] __synchronize_srcu+0xa0/0x240
[ 1580.600845] [ T80798] elevator_switch+0x12f/0x660
[ 1580.601518] [ T80798] elevator_change+0x2de/0x550
[ 1580.602201] [ T80798] elevator_set_default+0x278/0x2f0
[ 1580.602899] [ T80798] blk_register_queue+0x31b/0x470
[ 1580.603579] [ T80798] __add_disk+0x5fd/0xd50
[ 1580.604275] [ T80798] add_disk_fwnode+0x10f/0x590
[ 1580.605003] [ T80798] nbd_dev_add+0x6cd/0xa50 [nbd]
[ 1580.605714] [ T80798] 0xffffffffc0bdf14c
[ 1580.606395] [ T80798] do_one_initcall+0xd1/0x450
[ 1580.607148] [ T80798] do_init_module+0x281/0x820
[ 1580.607902] [ T80798] load_module+0x564e/0x7550
[ 1580.608581] [ T80798] init_module_from_file+0xe5/0x150
[ 1580.609334] [ T80798] idempotent_init_module+0x226/0x760
[ 1580.610119] [ T80798] __x64_sys_finit_module+0xc9/0x150
[ 1580.610864] [ T80798] do_syscall_64+0x94/0x6c0
[ 1580.611515] [ T80798] entry_SYSCALL_64_after_hwframe+0x76/0x7e
[ 1580.612290] [ T80798]
-> #2 (&q->elevator_lock){+.+.}-{4:4}:
[ 1580.613481] [ T80798] __mutex_lock+0x1b2/0x22c0
[ 1580.614164] [ T80798] elevator_change+0x12c/0x550
[ 1580.614917] [ T80798] elv_iosched_store+0x27a/0x2f0
[ 1580.615730] [ T80798] queue_attr_store+0x23b/0x360
[ 1580.616430] [ T80798] kernfs_fop_write_iter+0x3d6/0x5e0
[ 1580.617236] [ T80798] vfs_write+0x52c/0xf80
[ 1580.617888] [ T80798] ksys_write+0xfb/0x200
[ 1580.618545] [ T80798] do_syscall_64+0x94/0x6c0
[ 1580.619209] [ T80798] entry_SYSCALL_64_after_hwframe+0x76/0x7e
[ 1580.619973] [ T80798]
-> #1 (&q->q_usage_counter(io)){++++}-{0:0}:
[ 1580.621221] [ T80798] blk_alloc_queue+0x5bf/0x710
[ 1580.621924] [ T80798] blk_mq_alloc_queue+0x13f/0x250
[ 1580.622627] [ T80798] scsi_alloc_sdev+0x843/0xc60
[ 1580.623372] [ T80798] scsi_probe_and_add_lun+0x473/0xbc0
[ 1580.624205] [ T80798] __scsi_add_device+0x1be/0x1f0
[ 1580.624947] [ T80798] ata_scsi_scan_host+0x139/0x3a0
[ 1580.625708] [ T80798] async_run_entry_fn+0x93/0x540
[ 1580.626403] [ T80798] process_one_work+0x868/0x14b0
[ 1580.627181] [ T80798] worker_thread+0x5ee/0xfd0
[ 1580.627879] [ T80798] kthread+0x3af/0x770
[ 1580.628510] [ T80798] ret_from_fork+0x450/0x580
[ 1580.629224] [ T80798] ret_from_fork_asm+0x1a/0x30
[ 1580.629916] [ T80798]
-> #0 (fs_reclaim){+.+.}-{0:0}:
[ 1580.631062] [ T80798] __lock_acquire+0x14b7/0x22b0
[ 1580.631729] [ T80798] lock_acquire+0x16a/0x310
[ 1580.632412] [ T80798] fs_reclaim_acquire+0xd5/0x120
[ 1580.633165] [ T80798] __alloc_frozen_pages_noprof+0x1c0/0x650
[ 1580.633933] [ T80798] alloc_pages_mpol+0x151/0x380
[ 1580.634597] [ T80798] folio_alloc_mpol_noprof+0x12/0x210
[ 1580.635418] [ T80798] vma_alloc_folio_noprof+0xc6/0x180
[ 1580.636131] [ T80798] do_anonymous_page+0x786/0x1820
[ 1580.636825] [ T80798] __handle_mm_fault+0x137d/0x1cf0
[ 1580.637620] [ T80798] handle_mm_fault+0x220/0x7d0
[ 1580.638294] [ T80798] do_user_addr_fault+0x231/0xa40
[ 1580.638989] [ T80798] exc_page_fault+0x83/0x110
[ 1580.639691] [ T80798] asm_exc_page_fault+0x22/0x30
[ 1580.640471] [ T80798] rep_movs_alternative+0x75/0x90
[ 1580.641239] [ T80798] _copy_to_iter+0x1d9/0x1630
[ 1580.641951] [ T80798] __skb_datagram_iter+0x411/0x7e0
[ 1580.642691] [ T80798] skb_copy_datagram_iter+0x66/0x170
[ 1580.643459] [ T80798] tcp_recvmsg_locked+0x1516/0x23c0
[ 1580.644194] [ T80798] tcp_recvmsg+0xf6/0x530
[ 1580.644865] [ T80798] inet6_recvmsg+0xfe/0x640
[ 1580.645562] [ T80798] sock_recvmsg+0xdc/0x220
[ 1580.646262] [ T80798] sock_read_iter+0x268/0x4c0
[ 1580.646947] [ T80798] vfs_read+0x7a8/0xb10
[ 1580.647651] [ T80798] ksys_read+0x17e/0x200
[ 1580.648371] [ T80798] do_syscall_64+0x94/0x6c0
[ 1580.649096] [ T80798] entry_SYSCALL_64_after_hwframe+0x76/0x7e
[ 1580.649857] [ T80798]
other info that might help us debug this:
[ 1580.651564] [ T80798] Chain exists of:
fs_reclaim --> sk_lock-AF_INET6 --> &mm->mmap_lock
[ 1580.653383] [ T80798] Possible unsafe locking scenario:
[ 1580.654615] [ T80798] CPU0 CPU1
[ 1580.655301] [ T80798] ---- ----
[ 1580.656041] [ T80798] rlock(&mm->mmap_lock);
[ 1580.656725] [ T80798] lock(sk_lock-AF_INET6);
[ 1580.657523] [ T80798] lock(&mm->mmap_lock);
[ 1580.658385] [ T80798] lock(fs_reclaim);
[ 1580.658962] [ T80798]
*** DEADLOCK ***
[ 1580.660368] [ T80798] 2 locks held by nbd-server/80798:
[ 1580.661037] [ T80798] #0: ffff8881397b6e58 (sk_lock-AF_INET6){+.+.}-{0:0}, at: tcp_recvmsg+0xdb/0x530
[ 1580.661998] [ T80798] #1: ffff8881357a62a0 (&mm->mmap_lock){++++}-{4:4}, at: lock_mm_and_find_vma+0x2d/0xc80
[ 1580.662981] [ T80798]
stack backtrace:
[ 1580.664118] [ T80798] CPU: 0 UID: 0 PID: 80798 Comm: nbd-server Not tainted 6.18.0-rc1 #100 PREEMPT(voluntary)
[ 1580.664121] [ T80798] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.17.0-5.fc42 04/01/2014
[ 1580.664123] [ T80798] Call Trace:
[ 1580.664125] [ T80798] <TASK>
[ 1580.664127] [ T80798] dump_stack_lvl+0x6a/0x90
[ 1580.664132] [ T80798] print_circular_bug.cold+0x185/0x1d0
[ 1580.664136] [ T80798] check_noncircular+0x14a/0x170
[ 1580.664140] [ T80798] __lock_acquire+0x14b7/0x22b0
[ 1580.664143] [ T80798] lock_acquire+0x16a/0x310
[ 1580.664144] [ T80798] ? __alloc_frozen_pages_noprof+0x1c0/0x650
[ 1580.664146] [ T80798] ? ip6_mtu+0x162/0x3b0
[ 1580.664149] [ T80798] ? lock_release+0x1ad/0x300
[ 1580.664151] [ T80798] fs_reclaim_acquire+0xd5/0x120
[ 1580.664153] [ T80798] ? __alloc_frozen_pages_noprof+0x1c0/0x650
[ 1580.664155] [ T80798] __alloc_frozen_pages_noprof+0x1c0/0x650
[ 1580.664157] [ T80798] ? lock_release+0x1ad/0x300
[ 1580.664158] [ T80798] ? __pfx___alloc_frozen_pages_noprof+0x10/0x10
[ 1580.664160] [ T80798] ? ip6_output+0x262/0x780
[ 1580.664164] [ T80798] alloc_pages_mpol+0x151/0x380
[ 1580.664167] [ T80798] ? __pfx_alloc_pages_mpol+0x10/0x10
[ 1580.664170] [ T80798] folio_alloc_mpol_noprof+0x12/0x210
[ 1580.664173] [ T80798] vma_alloc_folio_noprof+0xc6/0x180
[ 1580.664175] [ T80798] ? __pfx_vma_alloc_folio_noprof+0x10/0x10
[ 1580.664177] [ T80798] ? ___pte_offset_map+0x2a/0x3d0
[ 1580.664180] [ T80798] ? lock_acquire+0x17a/0x310
[ 1580.664182] [ T80798] do_anonymous_page+0x786/0x1820
[ 1580.664185] [ T80798] ? rcu_read_unlock+0x17/0x60
[ 1580.664186] [ T80798] ? lock_release+0x1ad/0x300
[ 1580.664188] [ T80798] __handle_mm_fault+0x137d/0x1cf0
[ 1580.664191] [ T80798] ? mt_find+0x4fa/0x660
[ 1580.664193] [ T80798] ? __pfx___handle_mm_fault+0x10/0x10
[ 1580.664197] [ T80798] ? find_vma+0x9d/0x110
[ 1580.664200] [ T80798] ? __pfx_find_vma+0x10/0x10
[ 1580.664202] [ T80798] handle_mm_fault+0x220/0x7d0
[ 1580.664204] [ T80798] do_user_addr_fault+0x231/0xa40
[ 1580.664207] [ T80798] exc_page_fault+0x83/0x110
[ 1580.664209] [ T80798] asm_exc_page_fault+0x22/0x30
[ 1580.664211] [ T80798] RIP: 0010:rep_movs_alternative+0x75/0x90
[ 1580.664214] [ T80798] Code: 05 c3 cc cc cc cc 48 8b 06 48 89 07 48 8d 47 08 48 83 e0 f8 48 29 f8 48 01 c7 48 01 c6 48 29 c1 48 89 c8 48 c1 e9 03 83 e0 07 <f3> 48 a5 89 c1 85 c9 75 91 c3 cc cc cc cc 48 8d 0c c8 eb 86 cc cc
[ 1580.664216] [ T80798] RSP: 0018:ffff888122a9f5a8 EFLAGS: 00010246
[ 1580.664218] [ T80798] RAX: 0000000000000000 RBX: 0000000000003000 RCX: 000000000000051c
[ 1580.664220] [ T80798] RDX: 0000000000000000 RSI: ffff8881283b0790 RDI: 000055a1d4280000
[ 1580.664221] [ T80798] RBP: ffff888122a9fb20 R08: ffffffff89945d48 R09: ffffed102507600e
[ 1580.664222] [ T80798] R10: ffffed102507660e R11: 0000000000000000 R12: 000055a1d427f8e0
[ 1580.664223] [ T80798] R13: 000000000000001c R14: ffff8881283b0070 R15: 000000000000301c
[ 1580.664225] [ T80798] ? _copy_to_iter+0x1c8/0x1630
[ 1580.664228] [ T80798] _copy_to_iter+0x1d9/0x1630
[ 1580.664230] [ T80798] ? lock_acquire+0x17a/0x310
[ 1580.664231] [ T80798] ? find_held_lock+0x2b/0x80
[ 1580.664235] [ T80798] ? __pfx__copy_to_iter+0x10/0x10
[ 1580.664237] [ T80798] ? __virt_addr_valid+0x22e/0x4e0
[ 1580.664239] [ T80798] ? __check_object_size+0x2eb/0x5d0
[ 1580.664243] [ T80798] __skb_datagram_iter+0x411/0x7e0
[ 1580.664245] [ T80798] ? __pfx_simple_copy_to_iter+0x10/0x10
[ 1580.664248] [ T80798] ? __lock_acquire+0x497/0x22b0
[ 1580.664250] [ T80798] skb_copy_datagram_iter+0x66/0x170
[ 1580.664253] [ T80798] tcp_recvmsg_locked+0x1516/0x23c0
[ 1580.664256] [ T80798] ? __pfx_tcp_recvmsg_locked+0x10/0x10
[ 1580.664258] [ T80798] ? mark_held_locks+0x40/0x70
[ 1580.664260] [ T80798] ? lockdep_hardirqs_on_prepare+0xce/0x1b0
[ 1580.664262] [ T80798] tcp_recvmsg+0xf6/0x530
[ 1580.664264] [ T80798] ? avc_has_perm_noaudit+0x3d/0x290
[ 1580.664268] [ T80798] ? __pfx_tcp_recvmsg+0x10/0x10
[ 1580.664270] [ T80798] ? __pfx_sock_has_perm+0x10/0x10
[ 1580.664275] [ T80798] inet6_recvmsg+0xfe/0x640
[ 1580.664277] [ T80798] ? __pfx_avc_has_perm+0x10/0x10
[ 1580.664279] [ T80798] ? __pfx_inet6_recvmsg+0x10/0x10
[ 1580.664281] [ T80798] sock_recvmsg+0xdc/0x220
[ 1580.664284] [ T80798] sock_read_iter+0x268/0x4c0
[ 1580.664286] [ T80798] ? __pfx_file_has_perm+0x10/0x10
[ 1580.664288] [ T80798] ? __pfx_sock_read_iter+0x10/0x10
[ 1580.664291] [ T80798] ? rw_verify_area+0x6b/0x5f0
[ 1580.664294] [ T80798] vfs_read+0x7a8/0xb10
[ 1580.664296] [ T80798] ? lock_acquire+0x16a/0x310
[ 1580.664298] [ T80798] ? __pfx_vfs_read+0x10/0x10
[ 1580.664299] [ T80798] ? lock_acquire+0x17a/0x310
[ 1580.664301] [ T80798] ? __fget_files+0x1aa/0x2f0
[ 1580.664304] [ T80798] ? lock_release+0x1ad/0x300
[ 1580.664308] [ T80798] ksys_read+0x17e/0x200
[ 1580.664310] [ T80798] ? __pfx_ksys_read+0x10/0x10
[ 1580.664311] [ T80798] ? __lock_acquire+0x497/0x22b0
[ 1580.664313] [ T80798] do_syscall_64+0x94/0x6c0
[ 1580.664315] [ T80798] ? __pfx_css_rstat_updated+0x10/0x10
[ 1580.664319] [ T80798] ? lock_acquire+0x16a/0x310
[ 1580.664321] [ T80798] ? handle_mm_fault+0x36d/0x7d0
[ 1580.664322] [ T80798] ? rcu_is_watching+0x11/0xb0
[ 1580.664325] [ T80798] ? find_held_lock+0x2b/0x80
[ 1580.664327] [ T80798] ? rcu_read_unlock+0x17/0x60
[ 1580.664328] [ T80798] ? lock_release+0x1ad/0x300
[ 1580.664330] [ T80798] ? find_held_lock+0x2b/0x80
[ 1580.664332] [ T80798] ? exc_page_fault+0x83/0x110
[ 1580.664334] [ T80798] ? lock_release+0x1ad/0x300
[ 1580.664336] [ T80798] ? do_user_addr_fault+0x4c6/0xa40
[ 1580.664338] [ T80798] ? rcu_is_watching+0x11/0xb0
[ 1580.664340] [ T80798] entry_SYSCALL_64_after_hwframe+0x76/0x7e
[ 1580.664342] [ T80798] RIP: 0033:0x7f0c58a88462
[ 1580.664344] [ T80798] Code: 08 0f 85 61 42 ff ff 49 89 fb 48 89 f0 48 89 d7 48 89 ce 4c 89 c2 4d 89 ca 4c 8b 44 24 08 4c 8b 4c 24 10 4c 89 5c 24 08 0f 05 <c3> 66 2e 0f 1f 84 00 00 00 00 00 66 2e 0f 1f 84 00 00 00 00 00 66
[ 1580.664346] [ T80798] RSP: 002b:00007ffdf41c9538 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
[ 1580.664347] [ T80798] RAX: ffffffffffffffda RBX: 000055a1d427d020 RCX: 00007f0c58a88462
[ 1580.664348] [ T80798] RDX: 0000000000003000 RSI: 000055a1d427f8e0 RDI: 0000000000000005
[ 1580.664349] [ T80798] RBP: 00007ffdf41c9560 R08: 0000000000000000 R09: 0000000000000000
[ 1580.664350] [ T80798] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000003000
[ 1580.664351] [ T80798] R13: 000055a1d427f8e0 R14: 0000000000000005 R15: 000055a1d427f0f0
[ 1580.664355] [ T80798] </TASK>
[ 1580.753702] [ T458] nbd0:
[ 1580.824444] [ T80806] block nbd0: NBD_DISCONNECT
[ 1580.825131] [ T80806] block nbd0: Disconnected due to user request.
[ 1580.825747] [ T80806] block nbd0: shutting down sockets
[ 1580.879783] [ T80812] nbd0: detected capacity change from 0 to 20971520
[ 1580.883993] [ T80802] nbd0: p1
[ 1581.923717] [ T80820] block nbd0: NBD_DISCONNECT
[ 1581.925322] [ T80820] block nbd0: Disconnected due to user request.
[ 1581.926377] [ T80820] block nbd0: shutting down sockets
[ 1581.980348] [ T80823] nbd0: detected capacity change from 0 to 20971520
[ 1581.984519] [ T80802] nbd0: p1
[ 1582.040071] [ T80830] block nbd0: NBD_DISCONNECT
[ 1582.041644] [ T80830] block nbd0: Disconnected due to user request.
[ 1582.042681] [ T80830] block nbd0: shutting down sockets
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