Hello, syzbot found the following issue on: HEAD commit: 85cfd6e539bd kmsan: core: delete kmsan_gup_pgd_range() git tree: https://github.com/google/kmsan.git master console output: https://syzkaller.appspot.com/x/log.txt?x=17a505dc700000 kernel config: https://syzkaller.appspot.com/x/.config?x=b9807dd5b044fd7a dashboard link: https://syzkaller.appspot.com/bug?extid=ad1b8c404f0959c4bfcc compiler: clang version 14.0.0 (/usr/local/google/src/llvm-git-monorepo 2b554920f11c8b763cd9ed9003f4e19b919b8e1f), GNU ld (GNU Binutils for Debian) 2.35.2 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=10bcfdb2700000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=124ca21c700000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+ad1b8c404f0959c4bfcc@xxxxxxxxxxxxxxxxxxxxxxxxx ===================================================== BUG: KMSAN: uninit-value in mpol_rebind_policy mm/mempolicy.c:352 [inline] BUG: KMSAN: uninit-value in mpol_rebind_mm+0x35b/0x460 mm/mempolicy.c:383 mpol_rebind_policy mm/mempolicy.c:352 [inline] mpol_rebind_mm+0x35b/0x460 mm/mempolicy.c:383 cpuset_attach+0xe28/0x15e0 kernel/cgroup/cpuset.c:2291 cgroup_migrate_execute+0x1023/0x1d20 kernel/cgroup/cgroup.c:2515 cgroup_migrate kernel/cgroup/cgroup.c:2771 [inline] cgroup_attach_task+0x540/0x8b0 kernel/cgroup/cgroup.c:2804 __cgroup1_procs_write+0x5cc/0x7a0 kernel/cgroup/cgroup-v1.c:520 cgroup1_procs_write+0x97/0xb0 kernel/cgroup/cgroup-v1.c:533 cgroup_file_write+0x4c2/0x9e0 kernel/cgroup/cgroup.c:3852 kernfs_fop_write_iter+0x66a/0x9f0 fs/kernfs/file.c:296 call_write_iter include/linux/fs.h:2162 [inline] new_sync_write fs/read_write.c:503 [inline] vfs_write+0x1318/0x2030 fs/read_write.c:590 ksys_write+0x28b/0x510 fs/read_write.c:643 __do_sys_write fs/read_write.c:655 [inline] __se_sys_write fs/read_write.c:652 [inline] __x64_sys_write+0xdb/0x120 fs/read_write.c:652 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x54/0xd0 arch/x86/entry/common.c:82 entry_SYSCALL_64_after_hwframe+0x44/0xae Uninit was stored to memory at: __mpol_dup+0x107/0x480 mm/mempolicy.c:2326 mpol_dup include/linux/mempolicy.h:87 [inline] vma_replace_policy mm/mempolicy.c:762 [inline] mbind_range+0x13ee/0x1e40 mm/mempolicy.c:833 do_mbind+0x13d2/0x1b30 mm/mempolicy.c:1323 kernel_mbind mm/mempolicy.c:1477 [inline] __do_sys_mbind mm/mempolicy.c:1484 [inline] __se_sys_mbind+0x51c/0xc80 mm/mempolicy.c:1480 __x64_sys_mbind+0x19d/0x200 mm/mempolicy.c:1480 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x54/0xd0 arch/x86/entry/common.c:82 entry_SYSCALL_64_after_hwframe+0x44/0xae Uninit was created at: slab_post_alloc_hook mm/slab.h:524 [inline] slab_alloc_node mm/slub.c:3251 [inline] slab_alloc mm/slub.c:3259 [inline] kmem_cache_alloc+0x902/0x11c0 mm/slub.c:3264 mpol_new mm/mempolicy.c:293 [inline] do_mbind+0x8f5/0x1b30 mm/mempolicy.c:1279 kernel_mbind mm/mempolicy.c:1477 [inline] __do_sys_mbind mm/mempolicy.c:1484 [inline] __se_sys_mbind+0x51c/0xc80 mm/mempolicy.c:1480 __x64_sys_mbind+0x19d/0x200 mm/mempolicy.c:1480 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x54/0xd0 arch/x86/entry/common.c:82 entry_SYSCALL_64_after_hwframe+0x44/0xae CPU: 0 PID: 3474 Comm: syz-executor399 Not tainted 5.16.0-rc5-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ===================================================== --- 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@xxxxxxxxxxxxxxxx. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. syzbot can test patches for this issue, for details see: https://goo.gl/tpsmEJ#testing-patches
