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assert "refs != ~NUM" failed in kern_synch.c

Status: upstream: reported on 2025/02/08 12:26
Reported-by: syzbot+bee527c059e64ef8bdec@syzkaller.appspotmail.com
First crash: 14d, last: 5h02m

Sample crash report:
panic: kernel diagnostic assertion "refs != ~0" failed: file "/syzkaller/managers/multicore/kernel/sys/kern/kern_synch.c", line 944
Starting stack trace...
panic(ffffffff8343c78e) at panic+0x1d0 sys/kern/subr_prf.c:229
__assert(ffffffff833e97ac,ffffffff833efe28,3b0,ffffffff833efe70) at __assert+0x29
refcnt_finalize(ffff80002a4539d0,ffffffff8332e326) at refcnt_finalize+0x1c8 sys/kern/kern_synch.c:945
pppx_if_destroy(205b9a,ffff80002a4539c8) at pppx_if_destroy+0x3d sys/net/if_pppx.c:806
pppxclose(205b9a,1,2000,ffff8000ffff59d0) at pppxclose+0xa0 sys/net/if_pppx.c:553
spec_close(ffff80002a45f0a0) at spec_close+0x412
VOP_CLOSE(fffffd805c466d90,1,fffffd807f7d3680,ffff8000ffff59d0) at VOP_CLOSE+0x133 sys/kern/vfs_vops.c:156
vn_closefile(fffffd806be88998,ffff8000ffff59d0) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline]
vn_closefile(fffffd806be88998,ffff8000ffff59d0) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615
fdrop(fffffd806be88998,ffff8000ffff59d0) at fdrop+0x126 sys/kern/kern_descrip.c:1265
closef(fffffd806be88998,ffff8000ffff59d0) at closef+0x192 sys/kern/kern_descrip.c:1249
syscall(ffff80002a45f300) at syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff80002a45f300) at syscall+0xbc6 sys/arch/amd64/amd64/trap.c:577
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xaec9511fd30, count: 245
End of stack trace.

Crashes (35):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/02/22 23:45 openbsd 459198ba8b84 d34966d1 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore assert "refs != ~NUM" failed in kern_synch.c
2025/02/22 18:48 openbsd 45a541306066 d34966d1 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore assert "refs != ~NUM" failed in kern_synch.c
2025/02/22 14:15 openbsd 45a541306066 d34966d1 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-main assert "refs != ~NUM" failed in kern_synch.c
2025/02/22 13:06 openbsd 45a541306066 d34966d1 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore assert "refs != ~NUM" failed in kern_synch.c
2025/02/22 10:33 openbsd 45a541306066 d34966d1 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore assert "refs != ~NUM" failed in kern_synch.c
2025/02/22 04:59 openbsd 6a403588e274 d34966d1 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-main assert "refs != ~NUM" failed in kern_synch.c
2025/02/21 19:47 openbsd 6a403588e274 d34966d1 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-main assert "refs != ~NUM" failed in kern_synch.c
2025/02/20 01:32 openbsd 483a78e15aaa 50668798 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore assert "refs != ~NUM" failed in kern_synch.c
2025/02/18 15:41 openbsd 6065620d7782 c37c7249 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore assert "refs != ~NUM" failed in kern_synch.c
2025/02/18 09:45 openbsd 6065620d7782 c37c7249 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-main assert "refs != ~NUM" failed in kern_synch.c
2025/02/17 11:12 openbsd c48feb9479a9 4121cf9d .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore assert "refs != ~NUM" failed in kern_synch.c
2025/02/16 14:26 openbsd a1e112ca8bad 40a34ec9 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-main assert "refs != ~NUM" failed in kern_synch.c
2025/02/16 10:52 openbsd a1e112ca8bad 40a34ec9 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore assert "refs != ~NUM" failed in kern_synch.c
2025/02/16 03:33 openbsd a1e112ca8bad 40a34ec9 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-main assert "refs != ~NUM" failed in kern_synch.c
2025/02/15 16:42 openbsd 5c4be1f536db 40a34ec9 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-main assert "refs != ~NUM" failed in kern_synch.c
2025/02/15 13:02 openbsd 5c4be1f536db 40a34ec9 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-main assert "refs != ~NUM" failed in kern_synch.c
2025/02/15 05:41 openbsd 8d2464095911 40a34ec9 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-main assert "refs != ~NUM" failed in kern_synch.c
2025/02/15 02:36 openbsd 8d2464095911 40a34ec9 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore assert "refs != ~NUM" failed in kern_synch.c
2025/02/14 14:24 openbsd 4b5fa14926a1 fe17639f .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore assert "refs != ~NUM" failed in kern_synch.c
2025/02/13 12:46 openbsd bd92615b0406 7320a65f .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-main assert "refs != ~NUM" failed in kern_synch.c
2025/02/13 04:50 openbsd eb8501b6f1f9 2afad16e .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-main assert "refs != ~NUM" failed in kern_synch.c
2025/02/12 19:32 openbsd 705b70e045d6 b27c2402 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-main assert "refs != ~NUM" failed in kern_synch.c
2025/02/12 18:34 openbsd 705b70e045d6 b27c2402 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-main assert "refs != ~NUM" failed in kern_synch.c
2025/02/12 07:25 openbsd d800967ee04b f2baddf5 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore assert "refs != ~NUM" failed in kern_synch.c
2025/02/12 00:51 openbsd 06a6b4fa55e8 f2baddf5 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-main assert "refs != ~NUM" failed in kern_synch.c
2025/02/11 06:57 openbsd c7df606a226b 43f51a00 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-main assert "refs != ~NUM" failed in kern_synch.c
2025/02/10 22:58 openbsd 4f6ac7630c0c 43f51a00 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore assert "refs != ~NUM" failed in kern_synch.c
2025/02/10 19:01 openbsd 4f6ac7630c0c 43f51a00 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-main assert "refs != ~NUM" failed in kern_synch.c
2025/02/10 15:35 openbsd 4f6ac7630c0c 43f51a00 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-main assert "refs != ~NUM" failed in kern_synch.c
2025/02/09 10:04 openbsd 2347e6edcd5e ef44b750 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore assert "refs != ~NUM" failed in kern_synch.c
2025/02/09 06:58 openbsd 2347e6edcd5e ef44b750 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore assert "refs != ~NUM" failed in kern_synch.c
2025/02/08 21:33 openbsd 2347e6edcd5e ef44b750 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore assert "refs != ~NUM" failed in kern_synch.c
2025/02/08 17:27 openbsd 2347e6edcd5e ef44b750 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore assert "refs != ~NUM" failed in kern_synch.c
2025/02/08 16:05 openbsd 2347e6edcd5e ef44b750 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore assert "refs != ~NUM" failed in kern_synch.c
2025/02/08 12:25 openbsd 2347e6edcd5e ef44b750 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-main assert "refs != ~NUM" failed in kern_synch.c
* Struck through repros no longer work on HEAD.