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WARNING in do_notify_parent

Status: upstream: reported C repro on 2026/02/28 16:11
Subsystems: kernel
[Documentation on labels]
Reported-by: syzbot+bbe6b99feefc3a0842de@syzkaller.appspotmail.com
Fix commit: kernel/fork: validate exit_signal in kernel_clone()
Patched on: [ci-upstream-linux-next-kasan-gce-root ci-upstream-rust-kasan-gce], missing on: [ci-qemu-gce-upstream-auto ci-qemu-native-arm64-kvm ci-qemu-upstream ci-qemu-upstream-386 ci-qemu2-arm32 ci-qemu2-arm64 ci-qemu2-arm64-compat ci-qemu2-arm64-mte ci-qemu2-riscv64 ci-snapshot-upstream-root ci-upstream-bpf-kasan-gce ci-upstream-bpf-next-kasan-gce ci-upstream-gce-arm64 ci-upstream-gce-leak ci-upstream-kasan-badwrites-root ci-upstream-kasan-gce ci-upstream-kasan-gce-386 ci-upstream-kasan-gce-root ci-upstream-kasan-gce-selinux-root ci-upstream-kasan-gce-smack-root ci-upstream-kmsan-gce-386-root ci-upstream-kmsan-gce-root ci-upstream-net-kasan-gce ci-upstream-net-this-kasan-gce ci2-upstream-fs ci2-upstream-kcsan-gce ci2-upstream-usb]
First crash: 56d, last: now
▶ ▼ ✨ AI Jobs (1)
ID Workflow Result Correct Bug Created Started Finished Revision Error
89df55d2-bac7-41e5-830c-4b35b960f14e repro ❓ WARNING in do_notify_parent 2026/03/05 20:22 2026/03/05 20:37 2026/03/05 20:48 31e9c887f7dc24e04b3ca70d0d54fc34141844b0
Cause bisection: failed (error log, bisect log)
  
▶ ▼ Discussions (4)
Title Replies (including bot) Last reply
[PATCH v3] kernel/fork: validate exit_signal in kernel_clone() 4 (4) 2026/03/17 14:19
[PATCH v2] kernel/fork: validate exit_signal in kernel_clone() 2 (2) 2026/03/16 11:51
[syzbot] [kernel?] WARNING in do_notify_parent 0 (4) 2026/03/16 08:21
[PATCH] kernel/fork: validate exit_signal in clone() syscall 1 (1) 2026/03/07 06:42
▶ ▼ Last patch testing requests (2)
Created Duration User Patch Repo Result
2026/03/16 08:21 1h00m kartikey406@gmail.com patch linux-next OK log
2026/03/07 05:28 23m kartikey406@gmail.com patch linux-next OK log

Sample crash report:
------------[ cut here ]------------
!valid_signal(sig)
WARNING: kernel/signal.c:2174 at do_notify_parent+0xd18/0xe30 kernel/signal.c:2174, CPU#1: syz.1.3032/16353
Modules linked in:
CPU: 1 UID: 0 PID: 16353 Comm: syz.1.3032 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
RIP: 0010:do_notify_parent+0xd18/0xe30 kernel/signal.c:2174
Code: c6 05 08 81 92 0e 01 48 c7 c7 60 3a cb 8b be a3 08 00 00 48 c7 c2 e0 3b cb 8b e8 c3 8c 17 00 e9 2e fa ff ff e8 99 45 3b 00 90 <0f> 0b 90 45 31 e4 e9 1c ff ff ff e8 88 45 3b 00 90 0f 0b 90 e9 db
RSP: 0018:ffffc900069579e0 EFLAGS: 00010093
RAX: ffffffff818a7917 RBX: dffffc0000000000 RCX: ffff88805c31dc40
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 0000000000000040
RBP: ffffc90006957b30 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff52000d2af58 R12: ffff88802df44150
R13: ffff88805c31dc40 R14: 0000000000000080 R15: 1ffff92000d2af44
FS:  0000000000000000(0000) GS:ffff888125325000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055557f37d7d0 CR3: 000000007f67c000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 exit_notify kernel/exit.c:757 [inline]
 do_exit+0x13f1/0x22c0 kernel/exit.c:987
 do_group_exit+0x21b/0x2d0 kernel/exit.c:1117
 get_signal+0x1284/0x1330 kernel/signal.c:3037
 arch_do_signal_or_restart+0xbc/0x830 arch/x86/kernel/signal.c:337
 __exit_to_user_mode_loop kernel/entry/common.c:64 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:98 [inline]
 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline]
 irqentry_exit_to_user_mode_prepare include/linux/irq-entry-common.h:252 [inline]
 irqentry_exit_to_user_mode include/linux/irq-entry-common.h:323 [inline]
 irqentry_exit+0x284/0x730 kernel/entry/common.c:162
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618
RIP: 0033:0x7f1b2959c821
Code: Unable to access opcode bytes at 0x7f1b2959c7f7.
RSP: 002b:00000000fffffdb0 EFLAGS: 00010217
RAX: 0000000000000000 RBX: 00007f1b29816090 RCX: 00007f1b2959c819
RDX: 0000000000000000 RSI: 00000000fffffdb0 RDI: 0000000082160480
RBP: 00007f1b29632c91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000000
R13: 00007f1b29816128 R14: 00007f1b29816090 R15: 00007ffc81b16c88
 </TASK>

Crashes (16077):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/04/20 12:14 bpf eb5249b12507 303e2802 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-bpf-kasan-gce WARNING in do_notify_parent
2026/03/03 06:20 linux-next d517cb8cea01 28b83e23 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-rust-kasan-gce WARNING in do_notify_parent
2026/03/03 10:07 linux-next d517cb8cea01 28b83e23 .config console log report syz / log [disk image] [vmlinux] [kernel image] ci-upstream-rust-kasan-gce WARNING in do_notify_parent
2026/03/03 07:15 linux-next d517cb8cea01 28b83e23 .config console log report syz / log [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING in do_notify_parent
2026/04/22 00:40 upstream 4ee64205ffaa 0b6ab7ec .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING in do_notify_parent
2026/04/22 00:14 upstream 4ee64205ffaa 0b6ab7ec .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root WARNING in do_notify_parent
2026/04/21 23:46 upstream 4ee64205ffaa 9765efe0 .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto WARNING in do_notify_parent
2026/04/21 23:09 upstream 4ee64205ffaa 9765efe0 .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto WARNING in do_notify_parent
2026/04/21 23:02 upstream 4ee64205ffaa 9765efe0 .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto WARNING in do_notify_parent
2026/04/21 22:34 upstream 4ee64205ffaa 9765efe0 .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto WARNING in do_notify_parent
2026/04/21 22:10 upstream 4ee64205ffaa 9765efe0 .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto WARNING in do_notify_parent
2026/04/21 21:43 upstream 4ee64205ffaa 0b6ab7ec .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING in do_notify_parent
2026/04/21 19:18 upstream 4ee64205ffaa 9765efe0 .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto WARNING in do_notify_parent
2026/04/21 16:16 upstream b4e07588e743 0b6ab7ec .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root WARNING in do_notify_parent
2026/04/21 15:36 upstream b4e07588e743 3f2e655b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root WARNING in do_notify_parent
2026/04/21 15:21 upstream b4e07588e743 3f2e655b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING in do_notify_parent
2026/04/21 15:16 upstream b4e07588e743 3f2e655b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING in do_notify_parent
2026/04/21 02:37 upstream a5d1079c28a5 e65da4ee .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root WARNING in do_notify_parent
2026/04/21 12:03 upstream b4e07588e743 3f2e655b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-386 WARNING in do_notify_parent
2026/04/22 00:01 upstream 4ee64205ffaa 9765efe0 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in do_notify_parent
2026/04/21 23:51 upstream b4e07588e743 9765efe0 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root WARNING in do_notify_parent
2026/04/21 23:31 upstream 4ee64205ffaa 9765efe0 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in do_notify_parent
2026/04/21 21:13 upstream 4ee64205ffaa 9765efe0 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in do_notify_parent
2026/04/21 21:02 upstream b4e07588e743 9765efe0 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root WARNING in do_notify_parent
2026/04/21 19:29 upstream b4e07588e743 9765efe0 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root WARNING in do_notify_parent
2026/04/21 19:09 upstream b4e07588e743 9765efe0 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root WARNING in do_notify_parent
2026/04/21 18:55 upstream b4e07588e743 9765efe0 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root WARNING in do_notify_parent
2026/04/21 18:18 upstream b4e07588e743 9765efe0 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root WARNING in do_notify_parent
2026/04/21 17:54 upstream b4e07588e743 9765efe0 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root WARNING in do_notify_parent
2026/04/21 15:25 upstream b4e07588e743 9765efe0 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream WARNING in do_notify_parent
2026/04/21 21:29 upstream 4ee64205ffaa 9765efe0 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 WARNING in do_notify_parent
2026/04/21 17:19 upstream b4e07588e743 9765efe0 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 WARNING in do_notify_parent
2026/04/21 11:08 upstream b4e07588e743 3f2e655b .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu2-arm64-mte WARNING in do_notify_parent
2026/04/19 05:26 upstream fba676bd2919 303e2802 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu2-arm64-compat WARNING in do_notify_parent
2026/04/22 00:31 bpf eb5249b12507 0b6ab7ec .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-bpf-kasan-gce WARNING in do_notify_parent
2026/04/21 23:24 bpf eb5249b12507 0b6ab7ec .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-bpf-kasan-gce WARNING in do_notify_parent
2026/04/21 22:48 bpf eb5249b12507 0b6ab7ec .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-bpf-kasan-gce WARNING in do_notify_parent
2026/04/21 22:42 bpf eb5249b12507 0b6ab7ec .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-bpf-kasan-gce WARNING in do_notify_parent
2026/04/21 22:02 bpf eb5249b12507 0b6ab7ec .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-bpf-kasan-gce WARNING in do_notify_parent
2026/04/21 21:51 bpf eb5249b12507 0b6ab7ec .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-bpf-kasan-gce WARNING in do_notify_parent
2026/04/21 19:42 bpf eb5249b12507 0b6ab7ec .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-bpf-kasan-gce WARNING in do_notify_parent
2026/04/21 15:47 bpf eb5249b12507 3f2e655b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-bpf-kasan-gce WARNING in do_notify_parent
2026/04/21 15:41 bpf eb5249b12507 3f2e655b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-bpf-kasan-gce WARNING in do_notify_parent
2026/04/21 15:30 bpf eb5249b12507 3f2e655b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-bpf-kasan-gce WARNING in do_notify_parent
2026/04/21 23:18 bpf-next c8f0ee969f76 0b6ab7ec .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-bpf-next-kasan-gce WARNING in do_notify_parent
2026/04/21 22:55 bpf-next c8f0ee969f76 0b6ab7ec .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-bpf-next-kasan-gce WARNING in do_notify_parent
2026/04/21 22:48 bpf-next c8f0ee969f76 0b6ab7ec .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-bpf-next-kasan-gce WARNING in do_notify_parent
2026/04/21 22:27 bpf-next c8f0ee969f76 0b6ab7ec .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-bpf-next-kasan-gce WARNING in do_notify_parent
2026/04/21 21:35 bpf-next c8f0ee969f76 0b6ab7ec .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-bpf-next-kasan-gce WARNING in do_notify_parent
2026/04/21 21:22 bpf-next c8f0ee969f76 0b6ab7ec .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-bpf-next-kasan-gce WARNING in do_notify_parent
2026/04/21 20:52 bpf-next c8f0ee969f76 0b6ab7ec .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-bpf-next-kasan-gce WARNING in do_notify_parent
2026/04/21 20:39 bpf-next c8f0ee969f76 0b6ab7ec .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-bpf-next-kasan-gce WARNING in do_notify_parent
2026/04/21 20:27 bpf-next c8f0ee969f76 0b6ab7ec .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-bpf-next-kasan-gce WARNING in do_notify_parent
2026/04/21 20:16 bpf-next c8f0ee969f76 0b6ab7ec .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-bpf-next-kasan-gce WARNING in do_notify_parent
2026/04/21 19:54 bpf-next c8f0ee969f76 0b6ab7ec .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-bpf-next-kasan-gce WARNING in do_notify_parent
2026/04/21 18:39 bpf-next c8f0ee969f76 0b6ab7ec .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-bpf-next-kasan-gce WARNING in do_notify_parent
2026/04/21 16:54 bpf-next c8f0ee969f76 0b6ab7ec .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-bpf-next-kasan-gce WARNING in do_notify_parent
2026/04/21 15:55 bpf-next c8f0ee969f76 3f2e655b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-bpf-next-kasan-gce WARNING in do_notify_parent
2026/04/21 15:43 bpf-next c8f0ee969f76 3f2e655b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-bpf-next-kasan-gce WARNING in do_notify_parent
2026/03/09 19:53 linux-next a0ae2a256046 176bead5 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING in do_notify_parent
2026/03/09 03:46 linux-next a0ae2a256046 5cb44a80 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-rust-kasan-gce WARNING in do_notify_parent
2026/02/28 15:58 linux-next 3fa5e5702a82 43249bac .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-rust-kasan-gce WARNING in do_notify_parent
2026/02/24 16:07 linux-next 3ef088b0c577 96b1aa46 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-rust-kasan-gce WARNING in do_notify_parent
* Struck through repros no longer work on HEAD.