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kern/60776: reproducable assertion failure with today's current
>Number: 60776
>Category: kern
>Synopsis: reproducable assertion failure with today's current
>Confidential: no
>Severity: critical
>Priority: high
>Responsible: kern-bug-people
>State: open
>Class: sw-bug
>Submitter-Id: net
>Arrival-Date: Wed Sep 23 15:10:01 +0000 2026
>Originator: Martin Husemann
>Release: NetBSD 11.99.8
>Organization:
The NetBSD Foundation, Inc.
>Environment:
System: NetBSD seven-days-to-the-wolves.aprisoft.de 11.99.8 NetBSD 11.99.8 (GENERIC) #892: Wed Sep 23 10:29:43 CEST 2026 martin%seven-days-to-the-wolves.aprisoft.de@localhost:/work/src/sys/arch/amd64/compile/GENERIC amd64
Architecture: x86_64
Machine: amd64
>Description:
Today's amd64 kernel reproducably crashes for me when running build.sh.
[ 4043.4787057] panic: kernel diagnostic assertion "lwp_eprio(l) >= ts->ts_eprio" failed: file "../../../../kern/kern_turnstile.c", line 356
[ 4043.6286910] cpu1: Begin traceback...
[ 4043.6686907] vpanic() at netbsd:vpanic+0x189
[ 4043.7186903] kern_assert() at netbsd:kern_assert+0x4b
[ 4043.7786898] turnstile_wakeup() at netbsd:turnstile_wakeup+0x2c5
[ 4043.8586891] ubc_alloc.constprop.0() at netbsd:ubc_alloc.constprop.0+0x680
[ 4043.9386885] ubc_uiomove() at netbsd:ubc_uiomove+0x108
[ 4043.9986879] ffs_write() at netbsd:ffs_write+0x297
[ 4044.0586874] VOP_WRITE() at netbsd:VOP_WRITE+0x78
[ 4044.1086870] vn_write() at netbsd:vn_write+0xce
[ 4044.1686865] dofilewrite() at netbsd:dofilewrite+0x80
[ 4044.2286860] sys_write() at netbsd:sys_write+0x49
[ 4044.2786855] syscall() at netbsd:syscall+0x9d
[ 4044.3286851] --- syscall (number 4) ---
[ 4044.3786847] netbsd:syscall+0x9d:
[ 4044.4186843] cpu1: End traceback...
[ 4044.4586840] fatal breakpoint trap in supervisor mode
[ 4044.5186835] trap type 1 code 0 rip 0xffffffff8023541d cs 0x8 rflags 0x202 cr2 0xffffcc0940a31000 ilevel 0x8 rsp 0xffffcc0954238a90
[ 4044.6586823] curlwp 0xffff8d7fd9359400 pid 1596.1596 lowest kstack 0xffffcc09542342c0
Stopped in pid 1596.1596 (nbmkdep) at netbsd:breakpoint+0x5: leave
breakpoint() at netbsd:breakpoint+0x5
vpanic() at netbsd:vpanic+0x189
kern_assert() at netbsd:kern_assert+0x4b
turnstile_wakeup() at netbsd:turnstile_wakeup+0x2c5
ubc_alloc.constprop.0() at netbsd:ubc_alloc.constprop.0+0x680
ubc_uiomove() at netbsd:ubc_uiomove+0x108
ffs_write() at netbsd:ffs_write+0x297
VOP_WRITE() at netbsd:VOP_WRITE+0x78
vn_write() at netbsd:vn_write+0xce
dofilewrite() at netbsd:dofilewrite+0x80
sys_write() at netbsd:sys_write+0x49
syscall() at netbsd:syscall+0x9d
--- syscall (number 4) ---
netbsd:syscall+0x9d:
ds 4000
es 1
fs 180
gs 8a40
rdi 0
rsi 3f8
rbp ffffcc0954238a90
rbx ffffffff816368a8 ostype+0x7a008
rdx 1
rcx 0
rax 1
r8 3
r9 0
r10 0
r11 ffffffff81613182 ostype+0x568e2
r12 ffffcc0954238ad8
r13 104
r14 0
r15 ffff8d7fd9359400
rip ffffffff8023541d breakpoint+0x5
cs 8
rflags 202
rsp ffffcc0954238a90
ss 10
netbsd:breakpoint+0x5: leave
db{1}> show all locks
PID LID CPU STRUCT LWP * OWNER BITS LOCK
5705 5705 0 ffff8d803cedd000 0 0 netbsd:kernel_pmap_store+0x180
21887 21887 3 ffff8d801ec67800 ffff8d7fd9359400 7 ffff8d7f904f4400
23930>23930 2 ffff8d8057b39c00 ffff8d7fd9359400 7 ffff8d7f904f4400
0 > 0 3 ffffffff81a8c100 10700 1 netbsd:turnstile_locks+0xd00
db{1}> show all locks/t
PID LID CPU STRUCT LWP * OWNER BITS LOCK
5705 5705 0 ffff8d803cedd000 0 0 netbsd:kernel_pmap_st
ore+0x180
21887 21887 3 ffff8d801ec67800 ffff8d7fd9359400 7 ffff8d7f904f4400
trace: pid 1596 lid 1596 at 0xffffcc0954238a90
breakpoint() at netbsd:breakpoint+0x5
vpanic() at netbsd:vpanic+0x189
kern_assert() at netbsd:kern_assert+0x4b
turnstile_wakeup() at netbsd:turnstile_wakeup+0x2c5
ubc_alloc.constprop.0() at netbsd:ubc_alloc.constprop.0+0x680
ubc_uiomove() at netbsd:ubc_uiomove+0x108
ffs_write() at netbsd:ffs_write+0x297
VOP_WRITE() at netbsd:VOP_WRITE+0x78
vn_write() at netbsd:vn_write+0xce
dofilewrite() at netbsd:dofilewrite+0x80
sys_write() at netbsd:sys_write+0x49
syscall() at netbsd:syscall+0x9d
--- syscall (number 4) ---
netbsd:syscall+0x9d:
23930>23930 2 ffff8d8057b39c00 ffff8d7fd9359400 7 ffff8d7f904f4400
trace: pid 1596 lid 1596 at 0xffffcc0954238a90
breakpoint() at netbsd:breakpoint+0x5
vpanic() at netbsd:vpanic+0x189
kern_assert() at netbsd:kern_assert+0x4b
turnstile_wakeup() at netbsd:turnstile_wakeup+0x2c5
ubc_alloc.constprop.0() at netbsd:ubc_alloc.constprop.0+0x680
ubc_uiomove() at netbsd:ubc_uiomove+0x108
ffs_write() at netbsd:ffs_write+0x297
VOP_WRITE() at netbsd:VOP_WRITE+0x78
vn_write() at netbsd:vn_write+0xce
dofilewrite() at netbsd:dofilewrite+0x80
sys_write() at netbsd:sys_write+0x49
syscall() at netbsd:syscall+0x9d
--- syscall (number 4) ---
netbsd:syscall+0x9d:
0 > 0 3 ffffffff81a8c100 10700 1 netbsd:turnstile_locks+0xd00
db{1}> show all tstiles/t
PID LID COMMAND WAITING-FOR TYPE WAIT-CHANNEL
5705 5705 aarch64--netbsd- 0 mutex netbsd:kernel_pmap_store+0x180
7494 7494 nbtsort 0 cv ffff8d8072484108
4482 4482 sh 0 cv ffff8d7fc09ae758
69 69 sh 0 cv ffff8d8033fa58d8
5756 5756 sh 0 cv ffff8d7f911d4a08
2201 2201 sh 0 cv ffff8d8033fa5c58
21887 21887 aarch64--netbsd- ffff8d7fd9359400 rwlock ffff8d7f904f4400
trace: pid 1596 lid 1596 at 0xffffcc0954238a90
breakpoint() at netbsd:breakpoint+0x5
vpanic() at netbsd:vpanic+0x189
kern_assert() at netbsd:kern_assert+0x4b
turnstile_wakeup() at netbsd:turnstile_wakeup+0x2c5
ubc_alloc.constprop.0() at netbsd:ubc_alloc.constprop.0+0x680
ubc_uiomove() at netbsd:ubc_uiomove+0x108
ffs_write() at netbsd:ffs_write+0x297
VOP_WRITE() at netbsd:VOP_WRITE+0x78
vn_write() at netbsd:vn_write+0xce
dofilewrite() at netbsd:dofilewrite+0x80
sys_write() at netbsd:sys_write+0x49
syscall() at netbsd:syscall+0x9d
--- syscall (number 4) ---
netbsd:syscall+0x9d:
4481 4481 aarch64--netbsd- 0 cv ffff8d8125262458
16610 16610 sh 0 cv ffff8d7ff8775bd8
28753 28753 nbmake 0 select ffff8d867d782b00
4247 4247 sh 0 cv ffff8d7fbf7dec58
10038 10038 nbmake 0 select ffff8d867d782f00
4650 4650 sh 0 cv ffff8d7ff9ad7118
9118 9118 nbmake 0 select ffff8d867d782f00
27900 27900 nbmake 0 select ffff8d8682b6f400
19448 19448 nbmake 0 select ffff8d867d782b00
18296 18296 sh 0 cv ffff8d806a077418
15401 15401 sh 0 cv ffff8d7fdc4a9b58
29755 29755 sh 0 cv ffff8d8165250c58
22820 22820 nbmake 0 select ffff8d8682b6f400
13988 13988 sh 0 cv ffff8d8127992498
15682 15682 nbmake 0 select ffff8d867d782700
16365 16365 sh 0 cv ffff8d7f953c5098
15681 15681 nbmake 0 select ffff8d867d782b00
1515 1515 sh 0 cv ffff8d7fa3559818
3807 3807 nbmake 0 select ffff8d867d782700
1374 1374 sh 0 cv ffff8d7f9ae920d8
1504 1504 nbmake 0 select ffff8d867d782700
656 656 sh 0 cv ffff8d7f9ae92b58
653 653 sh 0 cv ffff8d7f98785898
648 648 tcsh 0 cv ffff8d7f91e1d588
644 644 rxvt 0 select ffff8d867d782b00
339 339 ssh-agent 0 select ffff8d867d782700
338 338 tcsh 0 kpause ffff8d7f9af61000
336 336 tcsh 0 kpause ffff8d7f9069f400
335 335 rxvt 0 select ffff8d867d782b00
333 333 tcsh 0 kpause ffff8d7f90f4d800
332 332 sshd-session 0 select ffff8d867d782700
330 330 sshd-session 0 select ffff8d8682b6f400
1850 1850 getty 0 kpause ffff8d7f95ca7c00
1721 1721 getty 0 kpause ffff8d7f99ecdc00
1592 1592 getty 0 kpause ffff8d7f90f4dc00
311 311 getty 0 cv ffff8d7f8f513288
302 302 cron 0 kpause ffff8d7f98632000
2598 2598 inetd 0 cv ffff8d7f950b3b20
401 401 sshd 0 select ffff8d867d782700
394 394 upsmon 0 kpause ffff8d7f9a1c7000
393 393 upsmon 0 cv ffff8d7f911d4808
390 390 upsd 0 select ffff8d867d782700
2485 2485 powerd 0 cv ffff8d7f97d5aca0
2303 2303 ntpd 0 kpause ffff8d7f99ecd000
1917 1917 rpc.lockd 0 select ffff8d867d782700
1586 1722 nfsd 0 cv ffff8d7f93fef720
1586 1568 nfsd 0 cv ffff8d7f93fef3e0
1586 1337 nfsd 0 cv ffff8d7f9a0bdb20
1586 1439 nfsd 0 cv ffff8d7f913dd1e0
1586 1586 nfsd 0 select ffff8d867d782f00
1401 1401 mountd 0 select ffff8d8682b6f400
1087 1087 rpcbind 0 select ffff8d867d782700
1085 1085 syslogd 0 cv ffff8d7f91922fa0
702 702 dhcpcd 0 cv ffff8d7f90d5c520
820 820 dhcpcd 0 cv ffff8d7f9925b3a0
817 817 dhcpcd 0 cv ffff8d7f91496e20
819 819 dhcpcd 0 cv ffff8d7f9a02aca0
1 1 init 0 cv ffff8d7f90775058
0 250 system 0 cv ffff8d7f90d10c48
0 175 system 0 cv ffff8d7f90c9f208
0 174 system 0 cv ffff8d7f909de408
0 173 system 0 cv ffff8d7f909de308
0 172 system 0 cv ffff8d7f907d5d08
0 171 system 0 kpause ffff8d7f90847c00
0 170 system 0 cv netbsd:uvmpd_pool_drain_cv
0 169 system 0 cv ffff8d7f907d5c08
0 168 system 0 sleep netbsd:uvm+0x188
0 165 system 0 cv ffff8d7f90822448
0 163 system 0 cv ffff8d7f8f3b1ac0
0 161 system 0 cv ffffcc0042f5eba0
0 222 system 0 cv ffff8d7f90722b88
0 221 system 0 cv ffff8d7f906c6bc8
0 220 system 0 cv netbsd:unp_thread_cv
0 218 system 0 cv ffff8d7f906f5f08
0 217 system 0 cv ffff8d7f906f5ec8
0 216 system 0 cv ffff8d7f906f5e88
0 215 system 0 cv ffff8d7f906f5e48
0 214 system 0 cv ffff8d7f906c6948
0 213 system 0 cv ffff8d7f906f5b08
0 212 system 0 cv ffff8d7f906f5ac8
0 211 system 0 cv ffff8d7f906f5a88
0 210 system 0 cv ffff8d7f906f5a48
0 209 system 0 cv ffff8d7f906f5708
0 208 system 0 cv ffff8d7f906f56c8
0 207 system 0 cv ffff8d7f906f5688
0 206 system 0 cv ffff8d7f906f5648
0 205 system 0 cv ffff8d7f90623b08
0 204 system 0 cv ffff8d7f90623ac8
0 203 system 0 cv ffff8d7f90623a88
0 202 system 0 cv ffff8d7f90623a48
0 200 system 0 cv ffff8d7f906c6088
0 199 system 0 cv ffff8d7f90651f08
0 198 system 0 cv ffff8d7f90651dc8
0 197 system 0 cv ffff8d7f90651c88
0 196 system 0 cv ffff8d7f90651b48
0 195 system 0 cv ffff8d7f90651a08
0 194 system 0 cv ffff8d7f906513c8
0 193 system 0 cv ffff8d7f8f2b2978
0 192 system 0 cv ffff8d7f8f2b24c0
0 117 system 0 cv netbsd:entropy_global+0xf0
0 116 system 0 cv ffffcc0042f60ba0
0 115 system 0 cv ffffcc0042f603b0
0 114 system 0 cv ffffcc0042f5fbc0
0 113 system 0 cv ffffcc0042f5f3d0
0 112 system 0 cv ffffcc0042f5ebe0
0 111 system 0 cv ffffcc0042f5e3f0
0 110 system 0 cv netbsd:usb_taskq+0x58
0 109 system 0 cv netbsd:usb_taskq+0x18
0 108 system 0 cv ffff8d7f8f8ba108
0 107 system 0 cv ffffcc0937a6d010
0 101 system 0 cv ffffcc0937a32010
0 30 system 0 cv ffffcc0937354010
0 24 system 0 cv ffff8d8682b6fe08
0 23 system 0 cv ffff8d8682b6fd08
0 22 system 0 cv ffff8d8682b6fc08
0 21 system 0 cv ffff8d8682b6fb08
0 20 system 0 cv ffff8d8682b6fa08
0 19 system 0 cv netbsd:gc+0x8
0 18 system 0 cv netbsd:sysmon_task_queue_cv
0 17 system 0 cv ffff8d8681b24948
0 16 system 0 cv ffff8d8681b24808
0 15 system 0 cv netbsd:pendfree_thread_cv
0 14 system 0 cv ffff8d8681b246c8
0 13 system 0 cv ffff8d8681b24588
0 12 system 0 cv ffff8d8681b24448
0 11 system 0 cv ffff8d8681b24308
0 10 system 0 cv ffff8d8681b241c8
0 9 system 0 cv ffff8d8682b6f728
0 8 system 0 cv netbsd:module_thread_cv
0 7 system 0 cv netbsd:cpu_info_primary+0x10
>How-To-Repeat:
Run build.sh with enough concurrency?
>Fix:
n/a
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