[  891.208024] run fstests btrfs/001 at 2022-09-06 21:06:05
[  891.835536] BTRFS: device fsid 08647b93-736e-429b-a985-3df0cc78324b devid 1 transid 6 /dev/mapper/vg0-lv7 scanned by mkfs.btrfs (2255)

[  891.835544] =============================
[  891.835552] WARNING: suspicious RCU usage
[  891.835553] 6.0.0-rc4+ #827 Not tainted
[  891.835555] -----------------------------
[  891.835556] fs/btrfs/volumes.c:402 suspicious rcu_dereference_check() usage!
[  891.835557] 
               other info that might help us debug this:

[  891.835558] 
               rcu_scheduler_active = 2, debug_locks = 1
[  891.835560] 2 locks held by mkfs.btrfs/2255:
[  891.835561]  #0: ffffffffa1eb4b28 (uuid_mutex){+.+.}-{3:3}, at: btrfs_control_ioctl+0x137/0x1a0
[  891.835572]  #1: ffff9d6044523ce0 (&fs_devs->device_list_mutex){+.+.}-{3:3}, at: btrfs_free_stale_devices+0x7b/0x200
[  891.835580] 
               stack backtrace:
[  891.835584] CPU: 1 PID: 2255 Comm: mkfs.btrfs Not tainted 6.0.0-rc4+ #827
[  891.835586] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.13.0-2.fc32 04/01/2014
[  891.835590] Call Trace:
[  891.835591]  
[  891.835593]  dump_stack_lvl+0x56/0x73
[  891.835598]  btrfs_free_device+0x84/0x90
[  891.835601]  btrfs_free_stale_devices+0xfa/0x200
[  891.835607]  btrfs_scan_one_device+0x1b5/0x1c0
[  891.835613]  btrfs_control_ioctl+0x14c/0x1a0
[  891.835617]  __x64_sys_ioctl+0x88/0xc0
[  891.835622]  do_syscall_64+0x38/0x90
[  891.835626]  entry_SYSCALL_64_after_hwframe+0x63/0xcd
[  891.835629] RIP: 0033:0x7f387d7690ab
[  891.835634] Code: ff ff ff 85 c0 79 9b 49 c7 c4 ff ff ff ff 5b 5d 4c 89 e0 41 5c c3 66 0f 1f 84 00 00 00 00 00 f3 0f 1e fa b8 10 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 95 bd 0c 00 f7 d8 64 89 01 48
[  891.835635] RSP: 002b:00007ffec0445f78 EFLAGS: 00000202 ORIG_RAX: 0000000000000010
[  891.835640] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007f387d7690ab
[  891.835641] RDX: 00007ffec0445f80 RSI: 0000000050009404 RDI: 0000000000000003
[  891.835642] RBP: 00007ffec0445f80 R08: 0000000000000000 R09: 0000000000000000
[  891.835644] R10: 0000000000000026 R11: 0000000000000202 R12: 00007ffec0449d5b
[  891.835645] R13: 00007ffec0449d5b R14: 00007ffec04483c8 R15: 0000000001d61d80
[  891.835656]  
[  891.867449] BTRFS info (device dm-7): using crc32c (crc32c-intel) checksum algorithm
[  891.867459] BTRFS info (device dm-7): using free space tree
[  891.870534] BTRFS info (device dm-7): checking UUID tree
[  892.004949] BTRFS info (device dm-7): setting incompat feature flag for DEFAULT_SUBVOL (0x2)
[  892.072144] BTRFS info (device dm-7): using crc32c (crc32c-intel) checksum algorithm
[  892.072152] BTRFS info (device dm-7): using free space tree
[  892.137269] BTRFS info (device dm-7): using crc32c (crc32c-intel) checksum algorithm
[  892.137278] BTRFS info (device dm-7): using free space tree
[  892.224787] BTRFS info (device dm-7): using crc32c (crc32c-intel) checksum algorithm
[  892.224798] BTRFS info (device dm-7): using free space tree
[  892.330690] BTRFS info (device dm-7): using crc32c (crc32c-intel) checksum algorithm
[  892.330698] BTRFS info (device dm-7): using free space tree
[  892.489026] BTRFS info (device dm-7): using crc32c (crc32c-intel) checksum algorithm
[  892.489035] BTRFS info (device dm-7): using free space tree