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Thu, 07 May 2026 18:00:05 +0200 Date: Thu, 07 May 2026 18:00:04 +0200 Message-ID: <9b025c57da794fba731182c0f19a3745.y2k@desarrollaria.com> From: y2k To: oleg@redhat.com Cc: brauner@kernel.org, linux-kernel@vger.kernel.org, syzkaller@googlegroups.com Subject: Re: WARNING in do_notify_parent (kernel/signal.c:2174) Content-Type: text/plain; charset=UTF-8 X-Provags-ID: V03:K1:plXb+5NZ750MkTqA/V0S42E5wdYoAFJ0+uWRLf3pv0HVKKBKRxh Yml7veK9wMBopJHGsM+kRCsDf6vEoV6HPBch4xWtRVu8HCg5fmp5rXD5QD7rXm5lGqWUjQD lg03OKYHAw4ZnEesL51U/B97zgYdiJYDepBrXXeo46cgS+4cbbGtO/j9cU4MTv34K16ss9y EcaNx1UFJQB3+36tsN2lQ== X-Spam-Flag: NO UI-OutboundReport: notjunk:1;M01:P0:31m9N0467gA=;mPQxA3fSweOrKDtomiBPI9sg39z vnPHxnlSnfgPCZczjjvk9jIh7Z6waalkHfc30U6/q7LiofCWsCz149wTE6gYsN0ezE70sEkt1 0b+GC+Lr2P6wQeWMYbfZ8ZxpSIJcew9hXjxrZloiUoHiwXD6gpaKvS+DNeUcP2YTfZ6izGp8j YEwOFEhHHQzaYZzgplQWho+7+UM4DnlpamMIHpQJuRd4zoTn0+EXEwg1GRltaegP4mvhXCMrB tBPOhns1qht1VWMgOD2MazgeIBd/kgX2eCftc0XTdAVbKsNXHTg6MsAKPsjsBAYPjYmL1sd7D d9ePmgW6dYlJhDuek6FnXPmhPbAKesBsd1l2J+ppr5pr5HXbzrl0d1wU3SWeacx6CwJr2OqkL lfscc8dizikRRuQsyMq1wJ/JaI6yLjJppF5B1dYEjOT+E+59DhY6+5y0VZMI7Gctkl4TXnBEp kHkgthRdEiy0b6jJY6SqR+O0M7tNErQCvixr/u9n11wppPinyBMqbxgXBXTYyN5Cj5XzsPqQG GEiQit3/NGs1xrEnvbpk/Wcdg1ujwgc9/JjLx8wGtOiC/oAptyBeBF0cbCGeidadKa8ltFdFx lI40Aix5iqdsxya5H5pHI0TI3ebKr9veJ4cvJtpiGdLONwoSzQTQVUxONbWTdYYGPJBNBgreq l1TPJ4z5mgjaAqptoUNI5kDlKAKb/pMUzxN9tYerQmwQJgUQ05G4nTamiPyNw9mWdD5IdPYsD Vw9LXu6ilztRGILDI64134C2TixaIuICtfqvVHoyFo/gbXOwquzyGB9sDhawEJhsCY2SR5FER XIehv+7PL+XMxdglE1ptVclQNsf5rD8rw70FsenysjOypfXU2e/gBw7LmRrgA2hfy8cy1U8lP cRoZPyj+dsI10BEbxr46KPrwDNUZUQUdfL60hARKL1n4N8UU71jo8u884YuLJIdnXg7ZPXWL6 +lxUaIKCPTXBu9cIewlblT/VIeyJffR1CToCDOw9AVc/y3LC3NEjGzN41kuVxkuPxSdOpTypl 8TQnLsh85SDGE5xbeFTTCcivVAAPbNaHnZbaO8myiQL20e0Ce0ozehAPBcOPNe4sBYehK5jv7 oV3njZ1Gfm6JxEF1IitYk+kYDX6FpXtQTC/q2Jux91NNt8XSHjj6f41zDLikJ+AciBTgaeGX1 VSxPR4tpZNiJDPIZlOagt8JS1YMxkx4AJGaeRjla+h1lilcFGwxmiBKSbo2RekHjzCjoH23CF aKEZAVZbeqGtftj84KBl6OvGtcXbYD+PQYw/T08ovl1sNuWl08Txvbz5Q2d69d7IexAfZ31F8 1XJJtNElY3Cx/iB3uABs6orNHGMZpG+1Kz3BWRhTp1aZ1vv4jp67dPaX2aYKp0ZjJj0cJFI4E 7LzLSBh6cTC8VwmtJEsmRL4d16dFTQ5BpsxApln3Y8LHSvDm4JQ6aKHgH6khCEbHHspsrGNuU qYTwa79Kk5DoaIi6biOVDio4H/PiPsoMwLs9JMwbaDpRsoe3UXxfuqe8MZz6nbDJH76R7/l9h mzV9OeXPyfp1uOfrsoAItLb9rfeDzZtsaCxfDOQrCqPkQwZhIJrhcwFX0LY31IcklXjlBqUGo Njo/8RISxurUDwrp+/45M3UiabB60wI8Qkdl/4KR6vlRvWWKts0xImSN9U6zYngMsmyOJTvmb Laxi91aQcEh13o8Uxey1gpn8F969NTJjJUv2h0dmC8dEOKL80ExvHqROjyY0iTIX/Jb/07v9T EvbRIZYdP1wtv9r1lOiek7KAV97jsQp/bkvyaECt3Czj+loj7FQ0y2QNdXQYgVomP0gms5a5p V6N0laUYGO7pJJSUlG4CdC9EsjB0vWgclt/+rsPklcXYw1W81dFJ5Lv6+WCXlJtugPvEA8PjK SFAyRFhd4zhBHqHZdW6mEydTWF7bZd4IewSELoMPlc+m2trMyIhg54J3Ae0e/+8L/iP7GvkQt GoTzkx+5+iOsMBoaHlX6lc+3VLsWNUtlpivpzWWHDg1fo9JQ/ASxen9H8eBcUvBiykmZ44uo8 hgsGUVUfsHbYOc4s52X7l1bagk+xoURa+DudCHQZU5+jzVBaxOxsn5cY8CZ806cUo/XaaGrRM jFtRPo3827Kiw/Fm0I+HgX0yUFKU4xhMT0dvnoIMJA7kueMAjzlYog== Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: I noticed that commit 0f8e38eeb995 adds WARN_ON_ONCE for invalid signals in do_notify_parent(). The syzkaller reproducer triggers this via syz_clone() with CLONE_THREAD flags. Could this be related to the ptrace path in exit.c:749 where exit_signal=-1 (set for CLONE_THREAD processes) could reach do_notify_parent() without a valid_signal() check? Thanks, y2k y2k@desarrollaria.com