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Thu, 04 Sep 2025 03:41:10 -0700 (PDT) Date: Thu, 04 Sep 2025 03:41:10 -0700 In-Reply-To: <357638f71edc7f1d9814b1851a64e09a8895bffc.1756968204.git.joeypabalinas@gmail.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <68b96cc6.a00a0220.eb3d.0003.GAE@google.com> Subject: [syzbot ci] Re: fork: simplify overcomplicated if conditions From: syzbot ci To: joeypabalinas@gmail.com, kees@kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org Cc: syzbot@lists.linux.dev, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" X-Rspamd-Queue-Id: EA7C3C000D X-Rspamd-Server: rspam04 X-Rspam-User: X-Stat-Signature: 8bz9yom7rrjizbxxutt5k6sic41gcpry X-HE-Tag: 1756982470-887673 X-HE-Meta: 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 Lvu0/Tw3 w028APWAlRzWQD0JjwIVjwl6BTY0PD4HQLYTnXFdBJacz8Gf95BvDAPovFTdWFT1T/EBz1OwZWPOaFxJRG7wfD5Sj6IH5yWl/ETDlYBMilaNFklewjVPQdnIFFqVWR+Z6fjixKh7ErdRxLz9KkfrgHnfQByTVSddxj6xnz8acClmHQY6alZqTfEVmxmw9hUXr3grGz2tpvAq8wn4JZ0kyLIAgDE06VNWoYnFzVC1vGAAsMBfhJmzK2Tlz++GCAEkFhvqEenrLqU+ZAj3FeHIFKpbNytGgh6MalOgS6yaSOj5oY4NLIo+fVh96E0tDsvl9BtI2VLOekP84feCZbkxdqNn8BueHUCtT27LyFEdmtPMb1h7PNYU0FbyKJg== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: syzbot ci has tested the following series [v1] fork: simplify overcomplicated if conditions https://lore.kernel.org/all/357638f71edc7f1d9814b1851a64e09a8895bffc.1756968204.git.joeypabalinas@gmail.com * [PATCH] fork: simplify overcomplicated if conditions and found the following issue: general protection fault in rest_init Full report is available here: https://ci.syzbot.org/series/e9c440d7-f494-4207-a59d-773bbbf909ff *** general protection fault in rest_init tree: torvalds URL: https://kernel.googlesource.com/pub/scm/linux/kernel/git/torvalds/linux base: b320789d6883cc00ac78ce83bccbfe7ed58afcf0 arch: amd64 compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 config: https://ci.syzbot.org/builds/58676b34-5a2d-40b9-ab9d-b45b8161dd5c/config Console: colour VGA+ 80x25 printk: legacy console [ttyS0] enabled printk: legacy console [ttyS0] enabled printk: legacy bootconsole [earlyser0] disabled printk: legacy bootconsole [earlyser0] disabled Lock dependency validator: Copyright (c) 2006 Red Hat, Inc., Ingo Molnar ... MAX_LOCKDEP_SUBCLASSES: 8 ... MAX_LOCK_DEPTH: 48 ... MAX_LOCKDEP_KEYS: 8192 ... CLASSHASH_SIZE: 4096 ... MAX_LOCKDEP_ENTRIES: 1048576 ... MAX_LOCKDEP_CHAINS: 1048576 ... CHAINHASH_SIZE: 524288 memory used by lock dependency info: 106625 kB memory used for stack traces: 8320 kB per task-struct memory footprint: 1920 bytes mempolicy: Enabling automatic NUMA balancing. Configure with numa_balancing= or the kernel.numa_balancing sysctl ACPI: Core revision 20250404 clocksource: hpet: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 19112604467 ns APIC: Switch to symmetric I/O mode setup x2apic enabled APIC: Switched APIC routing to: physical x2apic ..TIMER: vector=0x30 apic1=0 pin1=2 apic2=-1 pin2=-1 clocksource: tsc-early: mask: 0xffffffffffffffff max_cycles: 0x285d45cc0d6, max_idle_ns: 440795339158 ns Calibrating delay loop (skipped) preset value.. 5600.55 BogoMIPS (lpj=28002760) Last level iTLB entries: 4KB 0, 2MB 0, 4MB 0 Last level dTLB entries: 4KB 0, 2MB 0, 4MB 0, 1GB 0 mitigations: Enabled attack vectors: user_kernel, user_user, guest_host, guest_guest, SMT mitigations: auto Speculative Store Bypass: Vulnerable Spectre V2 : Mitigation: Retpolines ITS: Mitigation: Aligned branch/return thunks MDS: Vulnerable: Clear CPU buffers attempted, no microcode Spectre V1 : Mitigation: usercopy/swapgs barriers and __user pointer sanitization Spectre V2 : Spectre v2 / SpectreRSB: Filling RSB on context switch and VMEXIT active return thunk: its_return_thunk x86/fpu: x87 FPU will use FXSAVE Freeing SMP alternatives memory: 136K pid_max: default: 32768 minimum: 301 LSM: initializing lsm=lockdown,capability,landlock,yama,safesetid,tomoyo,apparmor,bpf,ima,evm landlock: Up and running. Yama: becoming mindful. TOMOYO Linux initialized AppArmor: AppArmor initialized LSM support for eBPF active Dentry cache hash table entries: 524288 (order: 10, 4194304 bytes, vmalloc hugepage) Inode-cache hash table entries: 262144 (order: 9, 2097152 bytes, vmalloc hugepage) Mount-cache hash table entries: 8192 (order: 4, 65536 bytes, vmalloc) Mountpoint-cache hash table entries: 8192 (order: 4, 65536 bytes, vmalloc) Running RCU synchronous self tests Running RCU synchronous self tests Oops: general protection fault, probably for non-canonical address 0xdffffc0000000005: 0000 [#1] SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000028-0x000000000000002f] CPU: 0 UID: 0 PID: 0 Comm: swapper/0 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 RIP: 0010:rest_init+0xf8/0x300 Code: f6 49 bf 00 00 00 00 00 fc ff df 89 ef 48 c7 c6 40 57 fe 8d e8 e9 47 12 f6 49 89 c6 48 89 c7 48 83 c7 2c 48 89 f8 48 c1 e8 03 <42> 0f b6 04 38 84 c0 0f 85 d9 01 00 00 41 80 4e 2f 04 e8 e1 e3 ff RSP: 0000:ffffffff8de07ee0 EFLAGS: 00010207 RAX: 0000000000000005 RBX: ffffffff8b79fc61 RCX: ffffffff8de95100 RDX: 0000000000000000 RSI: ffffffffffffffea RDI: 000000000000002c RBP: 00000000ffffffea R08: 0000000000000000 R09: ffffffff8b79fc61 R10: dffffc0000000000 R11: fffffbfff1f47207 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff8880b8618000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffff88813ffff000 CR3: 000000000df36000 CR4: 00000000000006f0 Call Trace: start_kernel+0x3a9/0x410 x86_64_start_reservations+0x24/0x30 x86_64_start_kernel+0x143/0x1c0 common_startup_64+0x13e/0x147 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:rest_init+0xf8/0x300 Code: f6 49 bf 00 00 00 00 00 fc ff df 89 ef 48 c7 c6 40 57 fe 8d e8 e9 47 12 f6 49 89 c6 48 89 c7 48 83 c7 2c 48 89 f8 48 c1 e8 03 <42> 0f b6 04 38 84 c0 0f 85 d9 01 00 00 41 80 4e 2f 04 e8 e1 e3 ff RSP: 0000:ffffffff8de07ee0 EFLAGS: 00010207 RAX: 0000000000000005 RBX: ffffffff8b79fc61 RCX: ffffffff8de95100 RDX: 0000000000000000 RSI: ffffffffffffffea RDI: 000000000000002c RBP: 00000000ffffffea R08: 0000000000000000 R09: ffffffff8b79fc61 R10: dffffc0000000000 R11: fffffbfff1f47207 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff8880b8618000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffff88813ffff000 CR3: 000000000df36000 CR4: 00000000000006f0 *** If these findings have caused you to resend the series or submit a separate fix, please add the following tag to your commit message: Tested-by: syzbot@syzkaller.appspotmail.com --- This report is generated by a bot. It may contain errors. syzbot ci engineers can be reached at syzkaller@googlegroups.com.