================================================================== BUG: KMSAN: uninit-value in mpol_rebind_policy mm/mempolicy.c:353 [inline] BUG: KMSAN: uninit-value in mpol_rebind_mm+0x249/0x370 mm/mempolicy.c:384 CPU: 1 PID: 12562 Comm: syz-executor.2 Not tainted 5.0.0+ #17 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x173/0x1d0 lib/dump_stack.c:113 kmsan_report+0x131/0x2a0 mm/kmsan/kmsan.c:624 __msan_warning+0x7a/0xf0 mm/kmsan/kmsan_instr.c:310 mpol_rebind_policy mm/mempolicy.c:353 [inline] mpol_rebind_mm+0x249/0x370 mm/mempolicy.c:384 cpuset_attach+0xc50/0x12c0 kernel/cgroup/cpuset.c:2170 cgroup_migrate_execute+0xbbd/0x1b00 kernel/cgroup/cgroup.c:2378 cgroup_migrate kernel/cgroup/cgroup.c:2637 [inline] cgroup_attach_task+0x642/0x10d0 kernel/cgroup/cgroup.c:2674 __cgroup1_procs_write+0x53b/0x670 kernel/cgroup/cgroup-v1.c:553 cgroup1_procs_write+0x9b/0xb0 kernel/cgroup/cgroup-v1.c:566 cgroup_file_write+0x44a/0x8e0 kernel/cgroup/cgroup.c:3507 kernfs_fop_write+0x569/0x840 fs/kernfs/file.c:316 __vfs_write+0x1e2/0xc20 fs/read_write.c:485 vfs_write+0x481/0x920 fs/read_write.c:549 ksys_write fs/read_write.c:598 [inline] __do_sys_write fs/read_write.c:610 [inline] __se_sys_write+0x17a/0x370 fs/read_write.c:607 __x64_sys_write+0x4a/0x70 fs/read_write.c:607 do_syscall_64+0xbc/0xf0 arch/x86/entry/common.c:291 entry_SYSCALL_64_after_hwframe+0x63/0xe7 RIP: 0033:0x458209 Code: ad b8 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 7b b8 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f42db515c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000458209 RDX: 0000000000000006 RSI: 0000000020000240 RDI: 0000000000000004 RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f42db5166d4 R13: 00000000004c761d R14: 00000000004dd210 R15: 00000000ffffffff Uninit was stored to memory at: kmsan_save_stack_with_flags mm/kmsan/kmsan.c:205 [inline] kmsan_save_stack mm/kmsan/kmsan.c:220 [inline] kmsan_internal_chain_origin+0x134/0x230 mm/kmsan/kmsan.c:426 kmsan_memcpy_memmove_metadata+0xb5b/0xfe0 mm/kmsan/kmsan.c:304 kmsan_memcpy_metadata+0xb/0x10 mm/kmsan/kmsan.c:324 __msan_memcpy+0x58/0x70 mm/kmsan/kmsan_instr.c:139 __mpol_dup+0x146/0x470 mm/mempolicy.c:2149 mpol_dup include/linux/mempolicy.h:91 [inline] vma_replace_policy mm/mempolicy.c:656 [inline] mbind_range mm/mempolicy.c:728 [inline] do_mbind mm/mempolicy.c:1223 [inline] kernel_mbind+0x254c/0x31a0 mm/mempolicy.c:1347 __do_sys_mbind mm/mempolicy.c:1354 [inline] __se_sys_mbind+0x11c/0x130 mm/mempolicy.c:1350 __x64_sys_mbind+0x6e/0x90 mm/mempolicy.c:1350 do_syscall_64+0xbc/0xf0 arch/x86/entry/common.c:291 entry_SYSCALL_64_after_hwframe+0x63/0xe7 Uninit was created at: kmsan_save_stack_with_flags mm/kmsan/kmsan.c:205 [inline] kmsan_internal_poison_shadow+0x92/0x150 mm/kmsan/kmsan.c:159 kmsan_kmalloc+0xa6/0x130 mm/kmsan/kmsan_hooks.c:173 kmem_cache_alloc+0x585/0xb60 mm/slub.c:2791 mpol_new mm/mempolicy.c:276 [inline] do_mbind mm/mempolicy.c:1180 [inline] kernel_mbind+0x8a7/0x31a0 mm/mempolicy.c:1347 __do_sys_mbind mm/mempolicy.c:1354 [inline] __se_sys_mbind+0x11c/0x130 mm/mempolicy.c:1350 __x64_sys_mbind+0x6e/0x90 mm/mempolicy.c:1350 do_syscall_64+0xbc/0xf0 arch/x86/entry/common.c:291 entry_SYSCALL_64_after_hwframe+0x63/0xe7 ==================================================================