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Message-ID: <000000000000405425060df6d9f3@google.com> Date: Tue, 02 Jan 2024 05:55:18 -0800 From: syzbot <syzbot+1e0ed05798af62917464@...kaller.appspotmail.com> To: akpm@...ux-foundation.org, linux-kernel@...r.kernel.org, linux-mm@...ck.org, syzkaller-bugs@...glegroups.com Subject: [syzbot] [mm?] KMSAN: uninit-value in shrinker_alloc Hello, syzbot found the following issue on: HEAD commit: d2da77f431ac Merge tag 'parisc-for-6.7-rc3' of git://git.k.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=16aec608e80000 kernel config: https://syzkaller.appspot.com/x/.config?x=e32016b84cf917ca dashboard link: https://syzkaller.appspot.com/bug?extid=1e0ed05798af62917464 compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1712ebc8e80000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/4c6f2e6a124d/disk-d2da77f4.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/c53690e51338/vmlinux-d2da77f4.xz kernel image: https://storage.googleapis.com/syzbot-assets/c0799b7d74db/bzImage-d2da77f4.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+1e0ed05798af62917464@...kaller.appspotmail.com RBP: 00007f43defc4120 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002 R13: 000000000000000b R14: 00007f43de39bf80 R15: 00007f43de4bfa48 </TASK> ===================================================== BUG: KMSAN: uninit-value in shrinker_unit_free mm/shrinker.c:33 [inline] BUG: KMSAN: uninit-value in shrinker_unit_alloc mm/shrinker.c:52 [inline] BUG: KMSAN: uninit-value in expand_one_shrinker_info mm/shrinker.c:136 [inline] BUG: KMSAN: uninit-value in expand_shrinker_info mm/shrinker.c:165 [inline] BUG: KMSAN: uninit-value in shrinker_memcg_alloc mm/shrinker.c:227 [inline] BUG: KMSAN: uninit-value in shrinker_alloc+0xd7c/0x1100 mm/shrinker.c:697 shrinker_unit_free mm/shrinker.c:33 [inline] shrinker_unit_alloc mm/shrinker.c:52 [inline] expand_one_shrinker_info mm/shrinker.c:136 [inline] expand_shrinker_info mm/shrinker.c:165 [inline] shrinker_memcg_alloc mm/shrinker.c:227 [inline] shrinker_alloc+0xd7c/0x1100 mm/shrinker.c:697 alloc_super+0x9a6/0xf00 fs/super.c:386 sget_fc+0x36b/0xf80 fs/super.c:797 vfs_get_super fs/super.c:1333 [inline] get_tree_nodev+0x48/0x340 fs/super.c:1357 mqueue_get_tree+0xff/0x1c0 ipc/mqueue.c:435 vfs_get_tree+0xa5/0x520 fs/super.c:1771 fc_mount+0x33/0x110 fs/namespace.c:1114 mq_create_mount ipc/mqueue.c:485 [inline] mq_init_ns+0x51c/0x760 ipc/mqueue.c:1700 create_ipc_ns ipc/namespace.c:73 [inline] copy_ipcs+0x4b3/0xa40 ipc/namespace.c:112 create_new_namespaces+0x3ad/0xdb0 kernel/nsproxy.c:90 unshare_nsproxy_namespaces+0x17a/0x2b0 kernel/nsproxy.c:228 ksys_unshare+0x8fa/0x1340 kernel/fork.c:3433 __do_sys_unshare kernel/fork.c:3504 [inline] __se_sys_unshare kernel/fork.c:3502 [inline] __x64_sys_unshare+0x48/0x70 kernel/fork.c:3502 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x44/0x110 arch/x86/entry/common.c:82 entry_SYSCALL_64_after_hwframe+0x63/0x6b Uninit was created at: slab_post_alloc_hook+0x129/0xa70 mm/slab.h:768 slab_alloc_node mm/slub.c:3478 [inline] __kmem_cache_alloc_node+0x5c9/0x970 mm/slub.c:3517 __do_kmalloc_node mm/slab_common.c:1006 [inline] __kmalloc_node+0x11c/0x3c0 mm/slab_common.c:1014 kmalloc_node include/linux/slab.h:620 [inline] kvmalloc_node+0xc0/0x2d0 mm/util.c:617 expand_one_shrinker_info mm/shrinker.c:129 [inline] expand_shrinker_info mm/shrinker.c:165 [inline] shrinker_memcg_alloc mm/shrinker.c:227 [inline] shrinker_alloc+0x606/0x1100 mm/shrinker.c:697 alloc_super+0x9a6/0xf00 fs/super.c:386 sget_fc+0x36b/0xf80 fs/super.c:797 vfs_get_super fs/super.c:1333 [inline] get_tree_nodev+0x48/0x340 fs/super.c:1357 mqueue_get_tree+0xff/0x1c0 ipc/mqueue.c:435 vfs_get_tree+0xa5/0x520 fs/super.c:1771 fc_mount+0x33/0x110 fs/namespace.c:1114 mq_create_mount ipc/mqueue.c:485 [inline] mq_init_ns+0x51c/0x760 ipc/mqueue.c:1700 create_ipc_ns ipc/namespace.c:73 [inline] copy_ipcs+0x4b3/0xa40 ipc/namespace.c:112 create_new_namespaces+0x3ad/0xdb0 kernel/nsproxy.c:90 unshare_nsproxy_namespaces+0x17a/0x2b0 kernel/nsproxy.c:228 ksys_unshare+0x8fa/0x1340 kernel/fork.c:3433 __do_sys_unshare kernel/fork.c:3504 [inline] __se_sys_unshare kernel/fork.c:3502 [inline] __x64_sys_unshare+0x48/0x70 kernel/fork.c:3502 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x44/0x110 arch/x86/entry/common.c:82 entry_SYSCALL_64_after_hwframe+0x63/0x6b CPU: 1 PID: 5127 Comm: syz-executor.1 Not tainted 6.7.0-rc2-syzkaller-00265-gd2da77f431ac #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023 ===================================================== --- 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@...glegroups.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 syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing. 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
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