panic: unknown host errno "errno NUM" (NUM) (3)

Status: moderation: reported C repro on 2026/10/15 15:02
Reported-by: syzbot+8b1e65a423c886aebc49@syzkaller.appspotmail.com
First crash: 12d, last: 17m
▶ ▼ Similar bugs (2)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
gvisor panic: unknown host errno "errno NUM" (NUM) 2 syz, C 397 784d 821d 26/26 fixed on 2024/08/27 14:22
gvisor panic: unknown host errno "errno NUM" (NUM) (2) 2 syz, C 286 752d 777d 26/26 fixed on 2024/09/30 10:41

Sample crash report:
panic: unknown host errno "errno 512" (512)

goroutine 2002 gp=0xc0011ff2c0 m=48 mp=0xc000a7c008 [running]:
panic({0x2da6df0?, 0xc000d8a060?})
	GOROOT/src/runtime/panic.go:878 +0x159 fp=0xc0019070b8 sp=0xc001907010 pc=0x4919d9
gvisor.dev/gvisor/pkg/syserr.FromHost(0x200)
	pkg/syserr/syserr.go:252 +0x10d fp=0xc001907120 sp=0xc0019070b8 pc=0xbdc50d
gvisor.dev/gvisor/pkg/syserr.FromError({0x2ef9f80, 0x2f50340})
	pkg/syserr/syserr.go:275 +0x169 fp=0xc001907190 sp=0xc001907120 pc=0xbdc6a9
gvisor.dev/gvisor/pkg/sentry/loader.Load({0x2f17a00, 0xc001433208}, {0xc0017b5008, 0xc0019800e8, 0x1, {0xc001510f00, 0x7}, 0x0, {0xc0015ee370, 0xc001553b08}, ...}, ...)
	pkg/sentry/loader/loader.go:283 +0x2b7 fp=0xc001907850 sp=0xc001907190 pc=0x10487f7
gvisor.dev/gvisor/pkg/sentry/kernel.(*Kernel).LoadTaskImage(0xc000278508, {0x2f17a00, 0xc001433208}, {0xc0017b5008, 0xc0019800e8, 0x1, {0xc001510f00, 0x7}, 0x0, {0xc0015ee370, ...}, ...})
	pkg/sentry/kernel/task_image.go:152 +0x3f1 fp=0xc001907b28 sp=0xc001907850 pc=0x11143d1
gvisor.dev/gvisor/pkg/sentry/kernel.(*runExecveAfterExecveCredsLock).execute(0xc000e8b9d0, 0xc001433208)
	pkg/sentry/kernel/task_exec.go:192 +0x7f2 fp=0xc001907e70 sp=0xc001907b28 pc=0x1100912
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).run(0xc001433208, 0x72)
	pkg/sentry/kernel/task_run.go:89 +0x4aa fp=0xc001907fb0 sp=0xc001907e70 pc=0x111976a
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start.gowrap1()
	pkg/sentry/kernel/task_start.go:579 +0x39 fp=0xc001907fe0 sp=0xc001907fb0 pc=0x116d479
runtime.goexit({})
	src/runtime/asm_amd64.s:1264 +0x1 fp=0xc001907fe8 sp=0xc001907fe0 pc=0x49a401
created by gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start in goroutine 1631
	pkg/sentry/kernel/task_start.go:579 +0x15a

Crashes (1564):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/10/08 21:38 gvisor 254aeb360ee1 9d4697fa .config console log report syz / log C ci-gvisor-ptrace-1-race panic: unknown host errno "errno NUM" (NUM)
2026/10/08 21:11 gvisor 254aeb360ee1 9d4697fa console log report syz / log C ci-gvisor-systrap-1 panic: unknown host errno "errno NUM" (NUM)
2026/10/08 20:48 gvisor 254aeb360ee1 9d4697fa console log report syz / log C ci-gvisor-ptrace-2 panic: unknown host errno "errno NUM" (NUM)
2026/10/08 20:47 gvisor 254aeb360ee1 9d4697fa .config console log report syz / log C ci-gvisor-ptrace-2-race panic: unknown host errno "errno NUM" (NUM)
2026/10/08 20:18 gvisor 254aeb360ee1 9d4697fa .config console log report syz / log C ci-gvisor-systrap-1-race panic: unknown host errno "errno NUM" (NUM)
2026/10/08 19:40 gvisor 254aeb360ee1 9d4697fa console log report syz / log C ci-gvisor-ptrace-1 panic: unknown host errno "errno NUM" (NUM)
2026/10/08 19:02 gvisor 254aeb360ee1 9d4697fa console log report syz / log C ci-gvisor-kvm panic: unknown host errno "errno NUM" (NUM)
2026/10/08 15:22 gvisor 254aeb360ee1 9d4697fa console log report syz / log C ci-gvisor-ptrace-3 panic: unknown host errno "errno NUM" (NUM)
2026/10/08 15:19 gvisor 254aeb360ee1 9d4697fa .config console log report syz / log C ci-gvisor-ptrace-3-race panic: unknown host errno "errno NUM" (NUM)
2026/10/08 20:30 gvisor 254aeb360ee1 9d4697fa console log report syz / log C ci-gvisor-arm64-ptrace-1 panic: unknown host errno "errno NUM" (NUM)
2026/10/08 20:22 gvisor 254aeb360ee1 9d4697fa .config console log report syz / log C ci-gvisor-arm64-ptrace-1-race panic: unknown host errno "errno NUM" (NUM)
2026/10/08 19:23 gvisor 254aeb360ee1 9d4697fa .config console log report syz / log C ci-gvisor-arm64-systrap-1-race panic: unknown host errno "errno NUM" (NUM)
2026/10/08 14:59 gvisor 254aeb360ee1 9d4697fa console log report syz / log C ci-gvisor-arm64-systrap-1 panic: unknown host errno "errno NUM" (NUM)
2026/10/21 02:00 gvisor c5e9146e675a 61c200c7 console log report info ci-gvisor-systrap-1 panic: unknown host errno "errno NUM" (NUM)
2026/10/20 22:40 gvisor c5e9146e675a df8746fb console log report info ci-gvisor-systrap-1 panic: unknown host errno "errno NUM" (NUM)
2026/10/20 16:02 gvisor c5e9146e675a df8746fb console log report info ci-gvisor-systrap-1 panic: unknown host errno "errno NUM" (NUM)
2026/10/20 12:49 gvisor c5e9146e675a df8746fb console log report info ci-gvisor-ptrace-1 panic: unknown host errno "errno NUM" (NUM)
2026/10/20 09:25 gvisor c5e9146e675a 21286ae2 console log report info ci-gvisor-systrap-1 panic: unknown host errno "errno NUM" (NUM)
2026/10/20 05:56 gvisor c5e9146e675a 21286ae2 .config console log report info ci-gvisor-ptrace-2-race panic: unknown host errno "errno NUM" (NUM)
2026/10/20 04:54 gvisor c5e9146e675a 21286ae2 .config console log report info ci-gvisor-ptrace-2-race panic: unknown host errno "errno NUM" (NUM)
2026/10/20 01:06 gvisor c5e9146e675a 21286ae2 console log report info ci-gvisor-kvm panic: unknown host errno "errno NUM" (NUM)
2026/10/20 00:28 gvisor c5e9146e675a 21286ae2 console log report info ci-gvisor-kvm panic: unknown host errno "errno NUM" (NUM)
2026/10/19 14:31 gvisor c5e9146e675a 440f8011 console log report info ci-gvisor-kvm panic: unknown host errno "errno NUM" (NUM)
2026/10/19 02:20 gvisor c5e9146e675a 432c0077 console log report info ci-gvisor-kvm panic: unknown host errno "errno NUM" (NUM)
2026/10/12 06:17 gvisor c5e9146e675a 4f92358f console log report info ci-gvisor-ptrace-2 panic: unknown host errno "errno NUM" (NUM)
2026/10/12 01:49 gvisor c5e9146e675a 4f92358f .config console log report info ci-gvisor-ptrace-1-race panic: unknown host errno "errno NUM" (NUM)
2026/10/11 16:51 gvisor c5e9146e675a 4f92358f .config console log report info ci-gvisor-systrap-1-race panic: unknown host errno "errno NUM" (NUM)
2026/10/11 09:08 gvisor c5e9146e675a 4f92358f console log report info ci-gvisor-ptrace-3 panic: unknown host errno "errno NUM" (NUM)
2026/10/21 01:33 gvisor c5e9146e675a 61c200c7 .config console log report info ci-gvisor-arm64-systrap-1-race panic: unknown host errno "errno NUM" (NUM)
2026/10/21 00:18 gvisor c5e9146e675a 61c200c7 .config console log report info ci-gvisor-arm64-systrap-1-race panic: unknown host errno "errno NUM" (NUM)
2026/10/20 21:25 gvisor c5e9146e675a df8746fb console log report info ci-gvisor-arm64-ptrace-1 panic: unknown host errno "errno NUM" (NUM)
2026/10/20 20:47 gvisor c5e9146e675a df8746fb .config console log report info ci-gvisor-arm64-systrap-1-race panic: unknown host errno "errno NUM" (NUM)
2026/10/20 19:44 gvisor c5e9146e675a df8746fb .config console log report info ci-gvisor-arm64-systrap-1-race panic: unknown host errno "errno NUM" (NUM)
2026/10/20 18:37 gvisor c5e9146e675a df8746fb .config console log report info ci-gvisor-arm64-systrap-1-race panic: unknown host errno "errno NUM" (NUM)
2026/10/20 17:33 gvisor c5e9146e675a df8746fb .config console log report info ci-gvisor-arm64-systrap-1-race panic: unknown host errno "errno NUM" (NUM)
2026/10/20 17:05 gvisor c5e9146e675a df8746fb .config console log report info ci-gvisor-arm64-systrap-1-race panic: unknown host errno "errno NUM" (NUM)
2026/10/20 14:59 gvisor c5e9146e675a df8746fb .config console log report info ci-gvisor-arm64-systrap-1-race panic: unknown host errno "errno NUM" (NUM)
2026/10/20 13:55 gvisor c5e9146e675a df8746fb .config console log report info ci-gvisor-arm64-systrap-1-race panic: unknown host errno "errno NUM" (NUM)
2026/10/20 11:49 gvisor c5e9146e675a df8746fb .config console log report info ci-gvisor-arm64-systrap-1-race panic: unknown host errno "errno NUM" (NUM)
2026/10/20 11:49 gvisor c5e9146e675a df8746fb .config console log report info ci-gvisor-arm64-systrap-1-race panic: unknown host errno "errno NUM" (NUM)
2026/10/20 10:27 gvisor c5e9146e675a 21286ae2 .config console log report info ci-gvisor-arm64-systrap-1-race panic: unknown host errno "errno NUM" (NUM)
2026/10/20 09:00 gvisor c5e9146e675a 21286ae2 console log report info ci-gvisor-arm64-ptrace-1 panic: unknown host errno "errno NUM" (NUM)
2026/10/20 07:53 gvisor c5e9146e675a 21286ae2 .config console log report info ci-gvisor-arm64-systrap-1-race panic: unknown host errno "errno NUM" (NUM)
2026/10/20 06:33 gvisor c5e9146e675a 21286ae2 .config console log report info ci-gvisor-arm64-systrap-1-race panic: unknown host errno "errno NUM" (NUM)
2026/10/20 03:49 gvisor c5e9146e675a 21286ae2 .config console log report info ci-gvisor-arm64-systrap-1-race panic: unknown host errno "errno NUM" (NUM)
2026/10/20 03:28 gvisor c5e9146e675a 21286ae2 .config console log report info ci-gvisor-arm64-systrap-1-race panic: unknown host errno "errno NUM" (NUM)
2026/10/20 02:19 gvisor c5e9146e675a 21286ae2 .config console log report info ci-gvisor-arm64-systrap-1-race panic: unknown host errno "errno NUM" (NUM)
2026/10/19 22:30 gvisor c5e9146e675a 440f8011 .config console log report info ci-gvisor-arm64-ptrace-1-race panic: unknown host errno "errno NUM" (NUM)
2026/10/19 21:28 gvisor c5e9146e675a 440f8011 .config console log report info ci-gvisor-arm64-systrap-1-race panic: unknown host errno "errno NUM" (NUM)
2026/10/19 20:39 gvisor c5e9146e675a 440f8011 .config console log report info ci-gvisor-arm64-systrap-1-race panic: unknown host errno "errno NUM" (NUM)
2026/10/19 19:38 gvisor c5e9146e675a 440f8011 .config console log report info ci-gvisor-arm64-systrap-1-race panic: unknown host errno "errno NUM" (NUM)
2026/10/19 18:38 gvisor c5e9146e675a 440f8011 console log report info ci-gvisor-arm64-ptrace-1 panic: unknown host errno "errno NUM" (NUM)
2026/10/19 17:56 gvisor c5e9146e675a 440f8011 .config console log report info ci-gvisor-arm64-systrap-1-race panic: unknown host errno "errno NUM" (NUM)
2026/10/19 16:44 gvisor c5e9146e675a 440f8011 .config console log report info ci-gvisor-arm64-systrap-1-race panic: unknown host errno "errno NUM" (NUM)
2026/10/19 15:40 gvisor c5e9146e675a 440f8011 console log report info ci-gvisor-arm64-ptrace-1 panic: unknown host errno "errno NUM" (NUM)
2026/10/19 15:34 gvisor c5e9146e675a 440f8011 .config console log report info ci-gvisor-arm64-ptrace-1-race panic: unknown host errno "errno NUM" (NUM)
2026/10/19 13:23 gvisor c5e9146e675a 440f8011 .config console log report info ci-gvisor-arm64-systrap-1-race panic: unknown host errno "errno NUM" (NUM)
2026/10/19 12:09 gvisor c5e9146e675a 440f8011 .config console log report info ci-gvisor-arm64-systrap-1-race panic: unknown host errno "errno NUM" (NUM)
2026/10/19 10:13 gvisor c5e9146e675a 432c0077 .config console log report info ci-gvisor-arm64-ptrace-1-race panic: unknown host errno "errno NUM" (NUM)
2026/10/19 09:19 gvisor c5e9146e675a 432c0077 .config console log report info ci-gvisor-arm64-systrap-1-race panic: unknown host errno "errno NUM" (NUM)
2026/10/19 07:56 gvisor c5e9146e675a 432c0077 .config console log report info ci-gvisor-arm64-systrap-1-race panic: unknown host errno "errno NUM" (NUM)
2026/10/19 06:56 gvisor c5e9146e675a 432c0077 .config console log report info ci-gvisor-arm64-ptrace-1-race panic: unknown host errno "errno NUM" (NUM)
2026/10/19 06:24 gvisor c5e9146e675a 432c0077 .config console log report info ci-gvisor-arm64-systrap-1-race panic: unknown host errno "errno NUM" (NUM)
2026/10/19 05:08 gvisor c5e9146e675a 432c0077 .config console log report info ci-gvisor-arm64-systrap-1-race panic: unknown host errno "errno NUM" (NUM)
2026/10/19 03:28 gvisor c5e9146e675a 432c0077 .config console log report info ci-gvisor-arm64-systrap-1-race panic: unknown host errno "errno NUM" (NUM)
2026/10/16 03:14 gvisor c5e9146e675a 3f2522c6 console log report info ci-gvisor-arm64-systrap-1 panic: unknown host errno "errno NUM" (NUM)
* Struck through repros no longer work on HEAD.