audit: type=1400 audit(1663600106.681:8): avc:  denied  { kernel } for  pid=6976 comm="syz-executor.7" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=perf_event permissive=1
------------[ cut here ]------------
======================================================
WARNING: possible circular locking dependency detected
6.0.0-rc6-next-20220919 #1 Not tainted
------------------------------------------------------
syz-executor.2/7021 is trying to acquire lock:
ffffffff853fa838 ((console_sem).lock){....}-{2:2}, at: down_trylock+0xe/0x70

but task is already holding lock:
ffff88800ff46c20 (&ctx->lock){....}-{2:2}, at: __perf_event_task_sched_out+0x53b/0x18d0

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #3 (&ctx->lock){....}-{2:2}:
       _raw_spin_lock+0x2a/0x40
       __perf_event_task_sched_out+0x53b/0x18d0
       __schedule+0xedd/0x2470
       schedule+0xda/0x1b0
       exit_to_user_mode_prepare+0x114/0x1a0
       syscall_exit_to_user_mode+0x19/0x40
       do_syscall_64+0x48/0x90
       entry_SYSCALL_64_after_hwframe+0x63/0xcd

-> #2 (&rq->__lock){-.-.}-{2:2}:
       _raw_spin_lock_nested+0x30/0x40
       raw_spin_rq_lock_nested+0x1e/0x30
       task_fork_fair+0x63/0x4d0
       sched_cgroup_fork+0x3d0/0x540
       copy_process+0x4183/0x6e20
       kernel_clone+0xe7/0x890
       user_mode_thread+0xad/0xf0
       rest_init+0x24/0x250
       arch_call_rest_init+0xf/0x14
       start_kernel+0x4c1/0x4e6
       secondary_startup_64_no_verify+0xe0/0xeb

-> #1 (&p->pi_lock){-.-.}-{2:2}:
       _raw_spin_lock_irqsave+0x39/0x60
       try_to_wake_up+0xab/0x1920
       up+0x75/0xb0
       __up_console_sem+0x6e/0x80
       console_unlock+0x46a/0x590
       do_con_write+0xc05/0x1d50
       con_write+0x21/0x40
       n_tty_write+0x4d4/0xfe0
       file_tty_write.constprop.0+0x49c/0x8f0
       vfs_write+0x9c3/0xd90
       ksys_write+0x127/0x250
       do_syscall_64+0x3b/0x90
       entry_SYSCALL_64_after_hwframe+0x63/0xcd

-> #0 ((console_sem).lock){....}-{2:2}:
       __lock_acquire+0x2a02/0x5e70
       lock_acquire+0x1a2/0x530
       _raw_spin_lock_irqsave+0x39/0x60
       down_trylock+0xe/0x70
       __down_trylock_console_sem+0x3b/0xd0
       vprintk_emit+0x16b/0x560
       vprintk+0x84/0xa0
       _printk+0xba/0xf1
       report_bug.cold+0x72/0xab
       handle_bug+0x3c/0x70
       exc_invalid_op+0x14/0x50
       asm_exc_invalid_op+0x16/0x20
       group_sched_out.part.0+0x2c7/0x460
       ctx_sched_out+0x8f1/0xc10
       __perf_event_task_sched_out+0x6d0/0x18d0
       __schedule+0xedd/0x2470
       schedule+0xda/0x1b0
       exit_to_user_mode_prepare+0x114/0x1a0
       syscall_exit_to_user_mode+0x19/0x40
       do_syscall_64+0x48/0x90
       entry_SYSCALL_64_after_hwframe+0x63/0xcd

other info that might help us debug this:

Chain exists of:
  (console_sem).lock --> &rq->__lock --> &ctx->lock

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(&ctx->lock);
                               lock(&rq->__lock);
                               lock(&ctx->lock);
  lock((console_sem).lock);

 *** DEADLOCK ***

2 locks held by syz-executor.2/7021:
 #0: ffff88806ce37d18 (&rq->__lock){-.-.}-{2:2}, at: __schedule+0x1cf/0x2470
 #1: ffff88800ff46c20 (&ctx->lock){....}-{2:2}, at: __perf_event_task_sched_out+0x53b/0x18d0

stack backtrace:
CPU: 0 PID: 7021 Comm: syz-executor.2 Not tainted 6.0.0-rc6-next-20220919 #1
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014
Call Trace:
 <TASK>
 dump_stack_lvl+0x8b/0xb3
 check_noncircular+0x263/0x2e0
 __lock_acquire+0x2a02/0x5e70
 lock_acquire+0x1a2/0x530
 _raw_spin_lock_irqsave+0x39/0x60
 down_trylock+0xe/0x70
 __down_trylock_console_sem+0x3b/0xd0
 vprintk_emit+0x16b/0x560
 vprintk+0x84/0xa0
 _printk+0xba/0xf1
 report_bug.cold+0x72/0xab
 handle_bug+0x3c/0x70
 exc_invalid_op+0x14/0x50
 asm_exc_invalid_op+0x16/0x20
RIP: 0010:group_sched_out.part.0+0x2c7/0x460
Code: 5e 41 5f e9 3b b7 ef ff e8 36 b7 ef ff 65 8b 1d 5b 15 ac 7e 31 ff 89 de e8 d6 b3 ef ff 85 db 0f 84 8a 00 00 00 e8 19 b7 ef ff <0f> 0b e9 a5 fe ff ff e8 0d b7 ef ff 48 8d 7d 10 48 b8 00 00 00 00
RSP: 0018:ffff88803c8c7c48 EFLAGS: 00010006
RAX: 0000000040000002 RBX: 0000000000000000 RCX: 0000000000000000
RDX: ffff8880100a5040 RSI: ffffffff81566077 RDI: 0000000000000005
RBP: ffff888008661158 R08: 0000000000000005 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000001 R12: ffff88800ff46c00
R13: ffff88806ce3d140 R14: ffffffff8547bf80 R15: 0000000000000002
 ctx_sched_out+0x8f1/0xc10
 __perf_event_task_sched_out+0x6d0/0x18d0
 __schedule+0xedd/0x2470
 schedule+0xda/0x1b0
 exit_to_user_mode_prepare+0x114/0x1a0
 syscall_exit_to_user_mode+0x19/0x40
 do_syscall_64+0x48/0x90
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7fbf32c2eb19
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 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fbf301a4218 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: 0000000000000001 RBX: 00007fbf32d41f68 RCX: 00007fbf32c2eb19
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007fbf32d41f6c
RBP: 00007fbf32d41f60 R08: 000000000000000e R09: 0000000000000000
R10: 0000000000000003 R11: 0000000000000246 R12: 00007fbf32d41f6c
R13: 00007fff019b196f R14: 00007fbf301a4300 R15: 0000000000022000
 </TASK>
WARNING: CPU: 0 PID: 7021 at kernel/events/core.c:2309 group_sched_out.part.0+0x2c7/0x460
Modules linked in:
CPU: 0 PID: 7021 Comm: syz-executor.2 Not tainted 6.0.0-rc6-next-20220919 #1
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014
RIP: 0010:group_sched_out.part.0+0x2c7/0x460
Code: 5e 41 5f e9 3b b7 ef ff e8 36 b7 ef ff 65 8b 1d 5b 15 ac 7e 31 ff 89 de e8 d6 b3 ef ff 85 db 0f 84 8a 00 00 00 e8 19 b7 ef ff <0f> 0b e9 a5 fe ff ff e8 0d b7 ef ff 48 8d 7d 10 48 b8 00 00 00 00
RSP: 0018:ffff88803c8c7c48 EFLAGS: 00010006
RAX: 0000000040000002 RBX: 0000000000000000 RCX: 0000000000000000
RDX: ffff8880100a5040 RSI: ffffffff81566077 RDI: 0000000000000005
RBP: ffff888008661158 R08: 0000000000000005 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000001 R12: ffff88800ff46c00
R13: ffff88806ce3d140 R14: ffffffff8547bf80 R15: 0000000000000002
FS:  00007fbf301a4700(0000) GS:ffff88806ce00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fbf32d3e000 CR3: 000000002fea8000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 ctx_sched_out+0x8f1/0xc10
 __perf_event_task_sched_out+0x6d0/0x18d0
 __schedule+0xedd/0x2470
 schedule+0xda/0x1b0
 exit_to_user_mode_prepare+0x114/0x1a0
 syscall_exit_to_user_mode+0x19/0x40
 do_syscall_64+0x48/0x90
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7fbf32c2eb19
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 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fbf301a4218 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: 0000000000000001 RBX: 00007fbf32d41f68 RCX: 00007fbf32c2eb19
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007fbf32d41f6c
RBP: 00007fbf32d41f60 R08: 000000000000000e R09: 0000000000000000
R10: 0000000000000003 R11: 0000000000000246 R12: 00007fbf32d41f6c
R13: 00007fff019b196f R14: 00007fbf301a4300 R15: 0000000000022000
 </TASK>
irq event stamp: 1928
hardirqs last  enabled at (1927): [<ffffffff81340019>] exit_to_user_mode_prepare+0x109/0x1a0
hardirqs last disabled at (1928): [<ffffffff8424d995>] __schedule+0x1225/0x2470
softirqs last  enabled at (900): [<ffffffff8117063b>] __irq_exit_rcu+0x11b/0x180
softirqs last disabled at (759): [<ffffffff8117063b>] __irq_exit_rcu+0x11b/0x180
---[ end trace 0000000000000000 ]---
sr 1:0:0:0: [sr0] tag#0 FAILED Result: hostbyte=DID_OK driverbyte=DRIVER_OK cmd_age=0s
sr 1:0:0:0: [sr0] tag#0 Sense Key : Not Ready [current] 
sr 1:0:0:0: [sr0] tag#0 Add. Sense: Medium not present
sr 1:0:0:0: [sr0] tag#0 CDB: Read(10) 28 00 00 00 00 00 00 00 08 00
I/O error, dev sr0, sector 0 op 0x0:(READ) flags 0x80700 phys_seg 4 prio class 2
sr 1:0:0:0: [sr0] tag#0 unaligned transfer
I/O error, dev sr0, sector 0 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 2
Buffer I/O error on dev sr0, logical block 0, async page read
sr 1:0:0:0: [sr0] tag#0 unaligned transfer
I/O error, dev sr0, sector 1 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 2
Buffer I/O error on dev sr0, logical block 1, async page read
sr 1:0:0:0: [sr0] tag#0 unaligned transfer
I/O error, dev sr0, sector 2 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 2
Buffer I/O error on dev sr0, logical block 2, async page read
sr 1:0:0:0: [sr0] tag#0 unaligned transfer
I/O error, dev sr0, sector 3 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 2
Buffer I/O error on dev sr0, logical block 3, async page read
sr 1:0:0:0: [sr0] tag#0 unaligned transfer
I/O error, dev sr0, sector 4 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 2
Buffer I/O error on dev sr0, logical block 4, async page read
sr 1:0:0:0: [sr0] tag#0 unaligned transfer
I/O error, dev sr0, sector 5 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 2
Buffer I/O error on dev sr0, logical block 5, async page read
sr 1:0:0:0: [sr0] tag#0 unaligned transfer
I/O error, dev sr0, sector 6 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 2
Buffer I/O error on dev sr0, logical block 6, async page read
sr 1:0:0:0: [sr0] tag#0 unaligned transfer
I/O error, dev sr0, sector 7 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 2
Buffer I/O error on dev sr0, logical block 7, async page read
netlink: 8 bytes leftover after parsing attributes in process `syz-executor.3'.
loop4: detected capacity change from 0 to 2048
EXT4-fs (loop4): mounted filesystem without journal. Quota mode: writeback.
EXT4-fs (loop4): unmounting filesystem.
sr 1:0:0:0: [sr0] tag#0 FAILED Result: hostbyte=DID_OK driverbyte=DRIVER_OK cmd_age=0s
sr 1:0:0:0: [sr0] tag#0 Sense Key : Not Ready [current] 
sr 1:0:0:0: [sr0] tag#0 Add. Sense: Medium not present
sr 1:0:0:0: [sr0] tag#0 CDB: Read(10) 28 00 00 00 00 00 00 00 08 00
I/O error, dev sr0, sector 0 op 0x0:(READ) flags 0x80700 phys_seg 4 prio class 2
sr 1:0:0:0: [sr0] tag#0 unaligned transfer
Buffer I/O error on dev sr0, logical block 0, async page read
sr 1:0:0:0: [sr0] tag#0 unaligned transfer
Buffer I/O error on dev sr0, logical block 1, async page read
sr 1:0:0:0: [sr0] tag#0 unaligned transfer
sr 1:0:0:0: [sr0] tag#0 unaligned transfer
sr 1:0:0:0: [sr0] tag#0 unaligned transfer
sr 1:0:0:0: [sr0] tag#0 unaligned transfer
sr 1:0:0:0: [sr0] tag#0 unaligned transfer
sr 1:0:0:0: [sr0] tag#0 unaligned transfer
device lo entered promiscuous mode
SELinux: security_context_str_to_sid (unconfined_u) failed with errno=-22
process 'syz-executor.0' launched '/dev/fd/-1/./file0' with NULL argv: empty string added
loop0: detected capacity change from 0 to 255
FAT-fs (loop0): Unrecognized mount option "uid<00000000000000060929" or missing value
SELinux: security_context_str_to_sid (unconfined_u) failed with errno=-22
loop0: detected capacity change from 0 to 255
FAT-fs (loop0): Unrecognized mount option "uid<00000000000000060929" or missing value
device lo left promiscuous mode
device lo entered promiscuous mode
device lo entered promiscuous mode
device lo left promiscuous mode
device lo entered promiscuous mode
device lo left promiscuous mode
device lo entered promiscuous mode
device lo left promiscuous mode
device lo entered promiscuous mode
device lo left promiscuous mode
syz-executor.5 (7172) used greatest stack depth: 24536 bytes left
hrtimer: interrupt took 19637 ns
device lo entered promiscuous mode
loop2: detected capacity change from 0 to 256
FAT-fs (loop2): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1)
9pnet_virtio: no channels available for device 127.0.0.1
9pnet_virtio: no channels available for device 127.0.0.1
FAT-fs (loop2): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1)
9pnet_virtio: no channels available for device 127.0.0.1
loop2: detected capacity change from 0 to 256
FAT-fs (loop2): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1)
9pnet_virtio: no channels available for device 127.0.0.1
9pnet_virtio: no channels available for device 127.0.0.1
syz-executor.3 (7227) used greatest stack depth: 24472 bytes left
FAT-fs (loop2): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1)
loop1: detected capacity change from 0 to 256
loop2: detected capacity change from 0 to 256
loop7: detected capacity change from 0 to 256
FAT-fs (loop2): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1)
FAT-fs (loop1): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1)
FAT-fs (loop7): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1)
loop0: detected capacity change from 0 to 256
cgroup: Need name or subsystem set
FAT-fs (loop0): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1)
syz-executor.3 (7262) used greatest stack depth: 24304 bytes left
FAT-fs (loop2): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1)
FAT-fs (loop1): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1)
loop2: detected capacity change from 0 to 256
FAT-fs (loop2): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1)
FAT-fs (loop0): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1)
loop1: detected capacity change from 0 to 256
FAT-fs (loop1): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1)
FAT-fs (loop7): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1)
loop0: detected capacity change from 0 to 256
FAT-fs (loop0): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1)
loop7: detected capacity change from 0 to 256
FAT-fs (loop7): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1)
FAT-fs (loop2): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1)
FAT-fs (loop1): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1)
FAT-fs (loop7): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1)
FAT-fs (loop0): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1)
loop0: detected capacity change from 0 to 256
FAT-fs (loop0): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1)
loop7: detected capacity change from 0 to 256
loop1: detected capacity change from 0 to 256
FAT-fs (loop1): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1)
FAT-fs (loop7): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1)
FAT-fs (loop0): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1)
FAT-fs (loop1): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1)
FAT-fs (loop7): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1)
=======================================================
WARNING: The mand mount option has been deprecated and
         and is ignored by this kernel. Remove the mand
         option from the mount to silence this warning.
=======================================================
random: crng reseeded on system resumption
Restarting kernel threads ... done.
random: crng reseeded on system resumption
Restarting kernel threads ... done.
capability: warning: `syz-executor.0' uses deprecated v2 capabilities in a way that may be insecure
random: crng reseeded on system resumption
Restarting kernel threads ... done.
random: crng reseeded on system resumption
Restarting kernel threads ... done.
random: crng reseeded on system resumption
Restarting kernel threads ... done.
9p: Unknown access argument &: -22
9p: Unknown access argument &: -22
loop7: detected capacity change from 0 to 256
audit: type=1400 audit(1663600113.010:9): avc:  denied  { write } for  pid=7503 comm="syz-executor.7" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=perf_event permissive=1
FAT-fs (loop7): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1)
random: crng reseeded on system resumption
Restarting kernel threads ... done.
loop7: detected capacity change from 0 to 256
9p: Unknown access argument &: -22
FAT-fs (loop7): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1)
random: crng reseeded on system resumption
Restarting kernel threads ... done.
9p: Unknown access argument &: -22
9p: Unknown access argument &: -22
loop7: detected capacity change from 0 to 256
FAT-fs (loop7): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1)
audit: type=1400 audit(1663600113.817:10): avc:  denied  { block_suspend } for  pid=7593 comm="syz-executor.2" capability=36  scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=capability2 permissive=1
loop7: detected capacity change from 0 to 1024
SELinux:  Context /sbin/dhclient is not valid (left unmapped).
audit: type=1400 audit(1663600113.998:11): avc:  denied  { associate } for  pid=7610 comm="syz-executor.0" name="sr0" dev="devtmpfs" ino=116 scontext=system_u:object_r:unlabeled_t:s0 tcontext=system_u:object_r:device_t:s0 tclass=filesystem permissive=1 srawcon="/sbin/dhclient"
EXT4-fs (loop7): mounted filesystem without journal. Quota mode: none.
EXT4-fs (loop7): unmounting filesystem.
loop7: detected capacity change from 0 to 1024
EXT4-fs (loop7): mounted filesystem without journal. Quota mode: none.
EXT4-fs (loop7): unmounting filesystem.
Zero length message leads to an empty skb
random: crng reseeded on system resumption
random: crng reseeded on system resumption
random: crng reseeded on system resumption
random: crng reseeded on system resumption
Bluetooth: Frame is too long (len 29, expected len 4)
Bluetooth: Frame is too long (len 29, expected len 4)
random: crng reseeded on system resumption
random: crng reseeded on system resumption
loop7: detected capacity change from 0 to 40
syz-executor.7: attempt to access beyond end of device
loop7: rw=2049, sector=88, nr_sectors = 4 limit=40
random: crng reseeded on system resumption
kworker/u4:10: attempt to access beyond end of device
loop7: rw=1, sector=92, nr_sectors = 32 limit=40
kworker/u4:10: attempt to access beyond end of device
loop7: rw=1, sector=124, nr_sectors = 4 limit=40
buffer_io_error: 6 callbacks suppressed
Buffer I/O error on dev loop7, logical block 31, lost async page write
loop7: detected capacity change from 0 to 40
random: crng reseeded on system resumption
syz-executor.7: attempt to access beyond end of device
loop7: rw=2049, sector=88, nr_sectors = 4 limit=40
random: crng reseeded on system resumption
loop7: detected capacity change from 0 to 40
random: crng reseeded on system resumption
syz-executor.7: attempt to access beyond end of device
loop7: rw=2049, sector=88, nr_sectors = 4 limit=40
random: crng reseeded on system resumption
random: crng reseeded on system resumption
random: crng reseeded on system resumption
loop7: detected capacity change from 0 to 40
netlink: 8 bytes leftover after parsing attributes in process `syz-executor.4'.
random: crng reseeded on system resumption
syz-executor.7: attempt to access beyond end of device
loop7: rw=2049, sector=88, nr_sectors = 4 limit=40
random: crng reseeded on system resumption
random: crng reseeded on system resumption
random: crng reseeded on system resumption
random: crng reseeded on system resumption