syzbot


panic: pec_close: spurious pgrp ref

Status: closed as dup on 2022/08/01 14:03
Reported-by: syzbot+aa0d1d892c507f3eb6d1@syzkaller.appspotmail.com
First crash: 851d, last: 851d
Duplicate of
Title Repro Cause bisect Fix bisect Count Last Reported
panic: spec_close: spurious pgrp ref 6 816d 916d

Sample crash report:
[ 772.828s8380] panic: pec_close: spurious pgrp ref
[ 772.8288380] cpu1: Begin traceback...
[ 772.8388246] vpanic() at netbsd:vpanic+0x282 sys/kern/subr_prf.c:293
[ 772.8688265] panic() at netbsd:panic+0x9e sys/kern/subr_prf.c:1043
[ 772.8988259] spec_close() at netbsd:spec_close+0x849 sys/miscfs/specfs/spec_vnops.c:1756
[ 772.9288256] VOP_CLOSE() at netbsd:VOP_CLOSE+0xfc sys/kern/vnode_if.c:605
[ 772.9488253] vn_close() at netbsd:vn_close+0x52 sys/kern/vfs_vnops.c:480
[ 772.9788261] closef() at netbsd:closef+0x152 sys/kern/kern_descrip.c:832
[ 772.9988253] fd_free() at netbsd:fd_free+0x528 sys/kern/kern_descrip.c:1571
[ 773.0288240] exit1() at netbsd:exit1+0x306 sys/kern/kern_exit.c:301
[ 773.0488270] sys_exit() at netbsd:sys_exit+0x92 sys/kern/kern_exit.c:180
[ 773.0788234] syscall() at netbsd:syscall+0x25a sy_call sys/sys/syscallvar.h:65 [inline]
[ 773.0788234] syscall() at netbsd:syscall+0x25a sy_invoke sys/sys/syscallvar.h:94 [inline]
[ 773.0788234] syscall() at netbsd:syscall+0x25a sys/arch/x86/x86/syscall.c:138
[ 773.0888251] --- syscall (number 1) ---
[ 773.0988241] netbsd:syscall+0x25a:
[ 773.0988241] cpu1: End traceback...
[ 773.1088238] fatal breakpoint trap in supervisor mode
[ 773.1088238] trap type 1 code 0 rip 0xffffffff80220a4d cs 0x8 rflags 0x286 cr2 0x7f7ed3e0a70a ilevel 0 rsp 0xffffc1019d78b860
[ 773.1188225] curlwp 0xffffc10013470140 pid 1068.1068 lowest kstack 0xffffc1019d7842c0
[ 773.1288229] uvm_fault(0xffffc10012cc7cc8, 0xffff900000000000, 1) -> e
[ 773.1288229] fatal page fault in supervisor mode
[ 773.1288229] trap type 6 code 0 rip 0xffffffff81b840cb cs 0x8 rflags 0x10283 cr2 0xffff90000000003d ilevel 0x8 rsp 0xffffc1019d78b380
[ 773.1288229] curlwp 0xffffc10013470140 pid 1068.1068 lowest kstack 0xffffc1019d7842c0
kernel: page fault trap, code=0
[ 773.1288229] uvm_fault(0xffffc10012cc7cc8, 0xffff900000000000, 1) -> e
[ 773.1288229] fatal page fault in supervisor mode
[ 773.1288229] trap type 6 code 0 rip 0xffffffff81b840cb cs 0x8 rflags 0x10283 cr2 0xffff90000000003d ilevel 0x8 rsp 0xffffc1019d78aea0
[ 773.1288229] curlwp 0xffffc10013470140 pid 1068.1068 lowest kstack 0xffffc1019d7842c0
kernel: page fault trap, code=0
[ 773.1288229] uvm_fault(0xffffc10012cc7cc8, 0xffff900000000000, 1) -> e
[ 773.1288229] fatal page fault in supervisor mode
[ 773.1288229] trap type 6 code 0 rip 0xffffffff81b840cb cs 0x8 rflags 0x10283 cr2 0xffff90000000003d ilevel 0x8 rsp 0xffffc1019d78a9c0
[ 773.1288229] curlwp 0xffffc10013470140 pid 1068.1068 lowest kstack 0xffffc1019d7842c0
kernel: page fault trap, code=0
[ 773.1288229] uvm_fault(0xffffc10012cc7cc8, 0xffff900000000000, 1) -> e
[ 773.1288229] fatal page fault in supervisor mode
[ 773.1288229] trap type 6 code 0 rip 0xffffffff81b840cb cs 0x8 rflags 0x10283 cr2 0xffff90000000003d ilevel 0x8 rsp 0xffffc1019d78a4e0
[ 773.1288229] curlwp 0xffffc10013470140 pid 1068.1068 lowest kstack 0xffffc1019d7842c0
kernel: page fault trap, code=0
[ 773.1288229] uvm_fault(0xffffc10012cc7cc8, 0xffff900000000000, 1) -> e
[ 773.1288229] fatal page fault in supervisor mode
[ 773.1288229] trap type 6 code 0 rip 0xffffffff81b840cb cs 0x8 rflags 0x10283 cr2 0xffff90000000003d ilevel 0x8 rsp 0xffffc1019d78a000
[ 773.1288229] curlwp 0xffffc10013470140 pid 1068.1068 lowest kstack 0xffffc1019d7842c0
kernel: page fault trap, code=0
[ 773.1288229] uvm_fault(0xffffc10012cc7cc8, 0xffff900000000000, 1) -> e
[ 773.1288229] fatal page fault in supervisor mode
[ 773.1288229] trap type 6 code 0 rip 0xffffffff81b840cb cs 0x8 rflags 0x10283 cr2 0xffff90000000003d ilevel 0x8 rsp 0xffffc1019d789b20
[ 773.1288229] curlwp 0xffffc10013470140 pid 1068.1068 lowest kstack 0xffffc1019d7842c0
kernel: page fault trap, code=0
[ 773.1288229] uvm_fault(0xffffc10012cc7cc8, 0xffff900000000000, 1) -> e
[ 773.1288229] fatal page fault in supervisor mode
[ 773.1288229] trap type 6 code 0 rip 0xffffffff81b840cb cs 0x8 rflags 0x10283 cr2 0xffff90000000003d ilevel 0x8 rsp 0xffffc1019d789640
[ 773.1288229] curlwp 0xffffc10013470140 pid 1068.1068 lowest kstack 0xffffc1019d7842c0
kernel: page fault trap, code=0
[ 773.1288229] uvm_fault(0xffffc10012cc7cc8, 0xffff900000000000, 1) -> e
[ 773.1288229] fatal page fault in supervisor mode
[ 773.1288229] trap type 6 code 0 rip 0xffffffff81b840cb cs 0x8 rflags 0x10283 cr2 0xffff90000000003d ilevel 0x8 rsp 0xffffc1019d789160
[ 773.1288229] curlwp 0xffffc10013470140 pid 1068.1068 lowest kstack 0xffffc1019d7842c0
kernel: page fault trap, code=0
[ 773.1288229] uvm_fault(0xffffc10012cc7cc8, 0xffff900000000000, 1) -> e
[ 773.1288229] fatal page fault in supervisor mode
[ 773.1288229] trap type 6 code 0 rip 0xffffffff81b840cb cs 0x8 rflags 0x10283 cr2 0xffff90000000003d ilevel 0x8 rsp 0xffffc1019d788c80
[ 773.1288229] curlwp 0xffffc10013470140 pid 1068.1068 lowest kstack 0xffffc1019d7842c0
kernel: page fault trap, code=0
[ 773.1288229] uvm_fault(0xffffc10012cc7cc8, 0xffff900000000000, 1) -> e
[ 773.1288229] fatal page fault in supervisor mode
[ 773.1288229] trap type 6 code 0 rip 0xffffffff81b840cb cs 0x8 rflags 0x10283 cr2 0xffff90000000003d ilevel 0x8 rsp 0xffffc1019d7887a0
[ 773.1288229] curlwp 0xffffc10013470140 pid 1068.1068 lowest kstack 0xffffc1019d7842c0
kernel: page fault trap, code=0
[ 773.1288229] uvm_fault(0xffffc10012cc7cc8, 0xffff900000000000, 1) -> e
[ 773.1288229] fatal page fault in supervisor mode
[ 773.1288229] trap type 6 code 0 rip 0xffffffff81b840cb cs 0x8 rflags 0x10283 cr2 0xffff90000000003d ilevel 0x8 rsp 0xffffc1019d7882c0
[ 773.1288229] curlwp 0xffffc10013470140 pid 1068.1068 lowest kstack 0xffffc1019d7842c0
kernel: page fault trap, code=0
[ 773.1288229] uvm_fault(0xffffc10012cc7cc8, 0xffff900000000000, 1) -> e
[ 773.1288229] fatal page fault in supervisor mode
[ 773.1288229] trap type 6 code 0 rip 0xffffffff81b840cb cs 0x8 rflags 0x10283 cr2 0xffff90000000003d ilevel 0x8 rsp 0xffffc1019d787de0
[ 773.1288229] curlwp 0xffffc10013470140 pid 1068.1068 lowest kstack 0xffffc1019d7842c0
kernel: page fault trap, code=0
[ 773.1288229] uvm_fault(0xffffc10012cc7cc8, 0xffff900000000000, 1) -> e
[ 773.1288229] fatal page fault in supervisor mode
[ 773.1288229] trap type 6 code 0 rip 0xffffffff81b840cb cs 0x8 rflags 0x10283 cr2 0xffff90000000003d ilevel 0x8 rsp 0xffffc1019d787900
[ 773.1288229] curlwp 0xffffc10013470140 pid 1068.1068 lowest kstack 0xffffc1019d7842c0
kernel: page fault trap, code=0
[ 773.1288229] uvm_fault(0xffffc10012cc7cc8, 0xffff900000000000, 1) -> e
[ 773.1288229] fatal page fault in supervisor mode
[ 773.1288229] trap type 6 code 0 rip 0xffffffff81b840cb cs 0x8 rflags 0x10283 cr2 0xffff90000000003d ilevel 0x8 rsp 0xffffc1019d787420
[ 773.1288229] curlwp 0xffffc10013470140 pid 1068.1068 lowest kstack 0xffffc1019d7842c0
kernel: page fault trap, code=0
[ 773.1288229] uvm_fault(0xffffc10012cc7cc8, 0xffff900000000000, 1) -> e
[ 773.1288229] fatal page fault in supervisor mode
[ 773.1288229] trap type 6 code 0 rip 0xffffffff81b840cb cs 0x8 rflags 0x10283 cr2 0xffff90000000003d ilevel 0x8 rsp 0xffffc1019d786f40
[ 773.1288229] curlwp 0xffffc10013470140 pid 1068.1068 lowest kstack 0xffffc1019d7842c0
kernel: page fault trap, code=0
[ 773.1288229] uvm_fault(0xffffc10012cc7cc8, 0xffff900000000000, 1) -> e
[ 773.1288229] fatal page fault in supervisor mode
[ 773.1288229] trap type 6 code 0 rip 0xffffffff81b840cb cs 0x8 rflags 0x10283 cr2 0xffff90000000003d ilevel 0x8 rsp 0xffffc1019d786a60
[ 773.1288229] curlwp 0xffffc10013470140 pid 1068.1068 lowest kstack 0xffffc1019d7842c0
kernel: page fault trap, code=0
[ 773.1288229] fatal double fault in supervisor mode
[ 773.1288229] trap type 13 code 0 rip 0xffffffff81a5f455 cs 0x8 rflags 0x10a02 cr2 0xffffc1019d785f38 ilevel 0x8 rsp 0xffffc1019d785f40
[ 773.1288229] curlwp 0xffffc10013470140 pid 1068.1068 lowest kstack 0xffffc1019d7842c0
kernel: double fault trap, code=0
[ 773.1288229] uvm_fault(0xffffc10012cc7cc8, 0xffff900000000000, 1) -> e
[ 773.1288229] fatal page fault in supervisor mode
[ 773.1288229] trap type 6 code 0 rip 0xffffffff81b840cb cs 0x8 rflags 0x10083 cr2 0xffff90000000003d ilevel 0x8 rsp 0xffffc10184debc40
[ 773.1288229] curlwp 0xffffc10013470140 pid 1068.1068 lowest kstack 0xffffc1019d7842c0
kernel: page fault trap, code=0
[ 773.1288229] uvm_fault(0xffffc10012cc7cc8, 0xffff900000000000, 1) -> e
[ 773.1288229] fatal page fault in supervisor mode
[ 773.1288229] trap type 6 code 0 rip 0xffffffff81b840cb cs 0x8 rflags 0x10283 cr2 0xffff90000000003d ilevel 0x8 rsp 0xffffc10184deb760
[ 773.1288229] curlwp 0xffffc10013470140 pid 1068.1068 lowest kstack 0xffffc1019d7842c0
kernel: page fault trap, code=0
[ 773.1288229] uvm_fault(0xffffc10012cc7cc8, 0xffff900000000000, 1) -> e
[ 773.1288229] fatal page fault in supervisor mode
[ 773.1288229] trap type 6 code 0 rip 0xffffffff81b840cb cs 0x8 rflags 0x10283 cr2 0xffff90000000003d ilevel 0x8 rsp 0xffffc10184deb280
[ 773.1288229] curlwp 0xffffc10013470140 pid 1068.1068 lowest kstack 0xffffc1019d7842c0
kernel: page fault trap, code=0
[ 773.1288229] uvm_fault(0xffffc10012cc7cc8, 0xffff900000000000, 1) -> e
[ 773.1288229] fatal page fault in supervisor mode
[ 773.1288229] trap type 6 code 0 rip 0xffffffff81b840cb cs 0x8 rflags 0x10283 cr2 0xffff90000000003d ilevel 0x8 rsp 0xffffc10184deada0
[ 773.1288229] curlwp 0xffffc10013470140 pid 1068.1068 lowest kstack 0xffffc1019d7842c0
kernel: page fault trap, code=0
[ 773.1288229] uvm_fault(0xffffc10012cc7cc8, 0xffff900000000000, 1) -> e
[ 773.1288229] fatal page fault in supervisor mode
[ 773.1288229] trap type 6 code 0 rip 0xffffffff81b840cb cs 0x8 rflags 0x10283 cr2 0xffff90000000003d ilevel 0x8 rsp 0xffffc10184dea8c0
[ 773.1288229] curlwp 0xffffc10013470140 pid 1068.1068 lowest kstack 0xffffc1019d7842c0
kernel: page fault trap, code=0
[ 773.1288229] uvm_fault(0xffffc10012cc7cc8, 0xffff900000000000, 1) -> e
[ 773.1288229] fatal page fault in supervisor mode
[ 773.1288229] trap type 6 code 0 rip 0xffffffff81b840cb cs 0x8 rflags 0x10283 cr2 0xffff90000000003d ilevel 0x8 rsp 0xffffc10184dea3e0
[ 773.1288229] curlwp 0xffffc10013470140 pid 1068.1068 lowest kstack 0xffffc1019d7842c0
kernel: page fault trap, code=0
[ 773.1288229] uvm_fault(0xffffc10012cc7cc8, 0xffff900000000000, 1) -> e
[ 773.1288229] fatal page fault in supervisor mode
[ 773.1288229] trap type 6 code 0 rip 0xffffffff81b840cb cs 0x8 rflags 0x10283 cr2 0xffff90000000003d ilevel 0x8 rsp 0xffffc10184de9f00
[ 773.1288229] curlwp 0xffffc10013470140 pid 1068.1068 lowest kstack 0xffffc1019d7842c0
kernel: page fault trap, code=0
[ 773.1288229] uvm_fault(0xffffc10012cc7cc8, 0xffff900000000000, 1) -> e
[ 773.1288229] fatal page fault in supervisor mode
[ 773.1288229] trap type 6 code 0 rip 0xffffffff81b840cb cs 0x8 rflags 0x10283 cr2 0xffff90000000003d ilevel 0x8 rsp 0xffffc10184de9a20
[ 773.1288229] curlwp 0xffffc10013470140 pid 1068.1068 lowest kstack 0xffffc1019d7842c0
kernel: page fault trap, code=0
[ 773.1288229] uvm_fault(0xffffc10012cc7cc8, 0xffff900000000000, 1) -> e
[ 773.1288229] fatal page fault in supervisor mode
[ 773.1288229] trap type 6 code 0 rip 0xffffffff81b840cb cs 0x8 rflags 0x10283 cr2 0xffff90000000003d ilevel 0x8 rsp 0xffffc10184de9540
[ 773.1288229] curlwp 0xffffc10013470140 pid 1068.1068 lowest kstack 0xffffc1019d7842c0
kernel: page fault trap, code=0
[ 773.1288229] uvm_fault(0xffffc10012cc7cc8, 0xffff900000000000, 1) -> e
[ 773.1288229] fatal page fault in supervisor mode
[ 773.1288229] trap type 6 code 0 rip 0xffffffff81b840cb cs 0x8 rflags 0x10283 cr2 0xffff90000000003d ilevel 0x8 rsp 0xffffc10184de9060
[ 773.1288229] curlwp 0xffffc10013470140 pid 1068.1068 lowest kstack 0xffffc1019d7842c0
kernel: page fault trap, code=0
[ 773.1288229] uvm_fault(0xffffc10012cc7cc8, 0xffff900000000000, 1) -> e
[ 773.1288229] fatal page fault in supervisor mode
[ 773.1288229] trap type 6 code 0 rip 0xffffffff81b840cb cs 0x8 rflags 0x10283 cr2 0xffff90000000003d ilevel 0x8 rsp 0xffffc10184de8b80
[ 773.1288229] curlwp 0xffffc10013470140 pid 1068.1068 lowest kstack 0xffffc1019d7842c0
kernel: page fault trap, code=0
SeaBIOS (version 1.8.2-google)
Total RAM Size = 0x0000000200000000 = 8192 MiB
CPUs found: 2     Max CPUs supported: 2
SeaBIOS (version 1.8.2-google)
Machine UUID 1f06db9e-5621-6dfd-bff7-3dc973b667bc
found virtio-scsi at 0:3
virtio-scsi vendor='Google' product='PersistentDisk' rev='1' type=0 removable=0
virtio-scsi blksize=512 sectors=4194304 = 2048 MiB
drive 0x000f2700: PCHS=0/0/0 translation=lba LCHS=520/128/63 s=4194304
Sending Seabios boot VM event.
Booting from Hard Disk 0...

>> NetBSD/x86 BIOS Boot, Revision 5.11 (Thu Jun 11 19:20:47 UTC 2020) (from NetBSD 9.99.65)
>> Memory: 639/3144640 k

     1. Boot normally
     2. Boot single user
     3. Drop to boot prompt

Choose an option; RETURN for default; SPACE to stop countdown.
Option 1 will be chosen in 5 seconds. 4 seconds. 3 seconds. 2 seconds. 1 seconds. 0 seconds. 0 seconds.     
command(s): rndseed /var/db/entropy-file;boot
default boot twice, skipping...
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/-\|/-\|/-\|/-\|/-\|/-\|Loading /var/db/entropy-file  
[   1.0000000] cpu_rng: rdrand/rdseed
[   1.0000000] entropy: ready
[   1.0000000] entropy: entering seed from bootloader with 256 bits of entropy

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2022/07/27 21:25 netbsd 50fba5fee58b fb95c74d .config console log report ci2-netbsd panic: pec_close: spurious pgrp ref
* Struck through repros no longer work on HEAD.