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Thu, 05 Feb 2026 23:24:24 -0800 (PST) Date: Thu, 05 Feb 2026 23:24:24 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <69859728.050a0220.3b3015.0033.GAE@google.com> Subject: [syzbot] [cgroups?] [mm?] KASAN: wild-memory-access Read in lookup_swap_cgroup_id (2) From: syzbot To: akpm@linux-foundation.org, cgroups@vger.kernel.org, hannes@cmpxchg.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, mhocko@kernel.org, muchun.song@linux.dev, roman.gushchin@linux.dev, shakeel.butt@linux.dev, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" X-Rspam-User: X-Rspamd-Server: rspam06 X-Rspamd-Queue-Id: 0D3B51C0004 X-Stat-Signature: t9bfo4e5mkeabhssea59uuurecqzj4xb X-HE-Tag: 1770362664-64526 X-HE-Meta: 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 Rd9K5edm 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 6GY8cmP0 xdb7RGIAofA3MtH80+Qec/gQsPoZNrPjzU1k+dib2I46yKkmV+HDNCsmOVWR6YelOG2723vofcl0kxsdJwm1RaR72a66ctLqde/T/0H0WzmM8egPNDlBK8rPIyYBBcjwjXRsxQnbpR4aOiqP+8DX1VxbcG1wZpenNO9SC5rAhpjX7uILt2h9WJdiqJhm6JWrTeQMRLZ+btDQhfh+uBSkaPTTgblOLOWfUTPELJqOvTImfiuO2kVtVqlHjiVz5KQgr7oRSp2qn42twh54SSj57BZnm8QE6fxqKGVy7ujbSaTkWlDtnrD542WC7+Ds42u3GK05xF7zLdbbT1zYqrO0+CTyl6lfLJWTqSdEqVGb3y1zetjS0zJCwuJfFIb1JEW3Jo9BEV9s4MIIArq/NtMV7L3dzLJiOi4gxEj40OiBxcwKeTwJoUgbHjaF6WriVl/IcPCGGFon+G4zLcfM/mtGCDEQ7arEpci5 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: Hello, syzbot found the following issue on: HEAD commit: 18f7fcd5e69a Linux 6.19-rc8 git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1428fc5a580000 kernel config: https://syzkaller.appspot.com/x/.config?x=f1fac0919970b671 dashboard link: https://syzkaller.appspot.com/bug?extid=e12bd9ca48157add237a compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/2c19d9acc149/disk-18f7fcd5.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/02cf07c94e58/vmlinux-18f7fcd5.xz kernel image: https://storage.googleapis.com/syzbot-assets/84011cec9819/bzImage-18f7fcd5.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+e12bd9ca48157add237a@syzkaller.appspotmail.com ================================================================== BUG: KASAN: wild-memory-access in instrument_atomic_read include/linux/instrumented.h:68 [inline] BUG: KASAN: wild-memory-access in atomic_read include/linux/atomic/atomic-instrumented.h:32 [inline] BUG: KASAN: wild-memory-access in __swap_cgroup_id_lookup mm/swap_cgroup.c:28 [inline] BUG: KASAN: wild-memory-access in lookup_swap_cgroup_id+0xf9/0x1a0 mm/swap_cgroup.c:127 Read of size 4 at addr 0007fffffffffffc by task syz.5.3598/20029 CPU: 1 UID: 0 PID: 20029 Comm: syz.5.3598 Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120 kasan_report+0xdf/0x1a0 mm/kasan/report.c:595 check_region_inline mm/kasan/generic.c:186 [inline] kasan_check_range+0x10f/0x1e0 mm/kasan/generic.c:200 instrument_atomic_read include/linux/instrumented.h:68 [inline] atomic_read include/linux/atomic/atomic-instrumented.h:32 [inline] __swap_cgroup_id_lookup mm/swap_cgroup.c:28 [inline] lookup_swap_cgroup_id+0xf9/0x1a0 mm/swap_cgroup.c:127 swap_pte_batch+0x3c3/0x720 mm/internal.h:390 zap_nonpresent_ptes mm/memory.c:1749 [inline] do_zap_pte_range mm/memory.c:1818 [inline] zap_pte_range mm/memory.c:1858 [inline] zap_pmd_range mm/memory.c:1950 [inline] zap_pud_range mm/memory.c:1978 [inline] zap_p4d_range mm/memory.c:1999 [inline] unmap_page_range+0x1f6f/0x43e0 mm/memory.c:2020 unmap_single_vma+0x153/0x240 mm/memory.c:2062 unmap_vmas+0x218/0x470 mm/memory.c:2104 exit_mmap+0x181/0xae0 mm/mmap.c:1277 __mmput+0x12a/0x410 kernel/fork.c:1173 mmput+0x67/0x80 kernel/fork.c:1196 exit_mm kernel/exit.c:581 [inline] do_exit+0x78a/0x2a30 kernel/exit.c:959 do_group_exit+0xd5/0x2a0 kernel/exit.c:1112 get_signal+0x1ec7/0x21e0 kernel/signal.c:3034 arch_do_signal_or_restart+0x91/0x7a0 arch/x86/kernel/signal.c:337 __exit_to_user_mode_loop kernel/entry/common.c:41 [inline] exit_to_user_mode_loop+0x86/0x4b0 kernel/entry/common.c:75 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline] syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:256 [inline] syscall_exit_to_user_mode_work include/linux/entry-common.h:159 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:194 [inline] do_syscall_64+0x4fe/0xf80 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f2f8f19aeb9 Code: Unable to access opcode bytes at 0x7f2f8f19ae8f. RSP: 002b:00007f2f900350e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 00007f2f8f416098 RCX: 00007f2f8f19aeb9 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f2f8f416098 RBP: 00007f2f8f416090 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f2f8f416128 R14: 00007ffc0c8cc050 R15: 00007ffc0c8cc138 ================================================================== --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@googlegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup