RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
Uninit was stored to memory at:
=====================================================
BUG: KMSAN: uninit-value in is_kernel include/linux/kallsyms.h:41 [inline]
BUG: KMSAN: uninit-value in is_ksym_addr include/linux/kallsyms.h:49 [inline]
BUG: KMSAN: uninit-value in kallsyms_lookup+0x148/0x8e0 kernel/kallsyms.c:292
CPU: 1 PID: 31318 Comm: syz-executor.2 Not tainted 5.6.0-rc7-syzkaller #0
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+0x1c9/0x220 lib/dump_stack.c:118
 kmsan_report+0xf7/0x1e0 mm/kmsan/kmsan_report.c:118
 __msan_warning+0x58/0xa0 mm/kmsan/kmsan_instr.c:215
 is_kernel include/linux/kallsyms.h:41 [inline]
 is_ksym_addr include/linux/kallsyms.h:49 [inline]
 kallsyms_lookup+0x148/0x8e0 kernel/kallsyms.c:292
 __sprint_symbol+0x140/0x590 kernel/kallsyms.c:365
 sprint_symbol+0x7c/0x90 kernel/kallsyms.c:396
 symbol_string+0x157/0x420 lib/vsprintf.c:961
 pointer+0x1560/0x1e40 lib/vsprintf.c:2188
 vsnprintf+0x1a2a/0x31b0 lib/vsprintf.c:2578
 vscnprintf+0xc2/0x180 lib/vsprintf.c:2677
 vprintk_store+0xef/0x11d0 kernel/printk/printk.c:1917
 vprintk_emit+0x2c0/0x860 kernel/printk/printk.c:1984
 vprintk_default+0x90/0xa0 kernel/printk/printk.c:2029
 vprintk_func+0x636/0x820 kernel/printk/printk_safe.c:386
 printk+0x18b/0x1d3 kernel/printk/printk.c:2062
 stack_trace_print+0x1b1/0x1f0 kernel/stacktrace.c:32
 kmsan_print_origin+0xf5/0x190 mm/kmsan/kmsan_report.c:52
 kmsan_internal_chain_origin+0x76/0x130 mm/kmsan/kmsan.c:302
 kmsan_memcpy_memmove_metadata+0x272/0x2e0 mm/kmsan/kmsan.c:247
 kmsan_memcpy_metadata+0xb/0x10 mm/kmsan/kmsan.c:267
 __msan_memcpy+0x43/0x50 mm/kmsan/kmsan_instr.c:116
 kstrdup mm/util.c:62 [inline]
 kstrdup_const+0x1cc/0x240 mm/util.c:82
 alloc_vfsmnt+0x1b8/0xaf0 fs/namespace.c:186
 clone_mnt+0xce/0x1910 fs/namespace.c:1023
 copy_tree+0x2ae/0x1d70 fs/namespace.c:1760
 propagate_one+0x77f/0xd00 fs/pnode.c:261
 propagate_mnt+0x1f0/0x1230 fs/pnode.c:309
 attach_recursive_mnt+0x1220/0x3d10 fs/namespace.c:2071
 graft_tree fs/namespace.c:2179 [inline]
 do_loopback fs/namespace.c:2307 [inline]
 do_mount+0x3bc5/0x4ac0 fs/namespace.c:3101
 __do_compat_sys_mount fs/compat.c:122 [inline]
 __se_compat_sys_mount+0x3a8/0xa10 fs/compat.c:89
 __ia32_compat_sys_mount+0x157/0x1b0 fs/compat.c:89
 do_syscall_32_irqs_on arch/x86/entry/common.c:339 [inline]
 do_fast_syscall_32+0x3c7/0x6e0 arch/x86/entry/common.c:410
 entry_SYSENTER_compat+0x68/0x77 arch/x86/entry/entry_64_compat.S:139
RIP: 0023:0xf7f75d99
Code: 90 e8 0b 00 00 00 f3 90 0f ae e8 eb f9 8d 74 26 00 89 3c 24 c3 90 90 90 90 90 90 90 90 90 90 90 90 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 eb 0d 90 90 90 90 90 90 90 90 90 90 90 90
RSP: 002b:00000000f5d700cc EFLAGS: 00000296 ORIG_RAX: 0000000000000015
RAX: ffffffffffffffda RBX: 0000000020000000 RCX: 00000000200004c0
RDX: 0000000000000000 RSI: 0000000000007a04 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000

Uninit was created at:
 kmsan_save_stack_with_flags+0x3c/0x90 mm/kmsan/kmsan.c:144
 kmsan_internal_alloc_meta_for_pages mm/kmsan/kmsan_shadow.c:280 [inline]
 kmsan_alloc_page+0xb9/0x180 mm/kmsan/kmsan_shadow.c:304
 __alloc_pages_nodemask+0x5712/0x5e80 mm/page_alloc.c:4777
 alloc_pages_current+0x67d/0x990 mm/mempolicy.c:2211
 alloc_pages include/linux/gfp.h:532 [inline]
 alloc_slab_page+0x111/0x12f0 mm/slub.c:1530
 allocate_slab mm/slub.c:1675 [inline]
 new_slab+0x2bc/0x1130 mm/slub.c:1741
 new_slab_objects mm/slub.c:2490 [inline]
 ___slab_alloc+0x14a3/0x2040 mm/slub.c:2651
 __slab_alloc mm/slub.c:2691 [inline]
 slab_alloc_node mm/slub.c:2765 [inline]
 kmem_cache_alloc_node+0x77b/0xed0 mm/slub.c:2838
 alloc_task_struct_node kernel/fork.c:170 [inline]
 dup_task_struct kernel/fork.c:869 [inline]
 copy_process+0xb29/0x9e90 kernel/fork.c:1922
 _do_fork+0x24f/0xfb0 kernel/fork.c:2432
 kernel_thread+0x171/0x230 kernel/fork.c:2519
 call_usermodehelper_exec_work+0xb3/0x540 kernel/umh.c:195
 process_one_work+0x1555/0x1f40 kernel/workqueue.c:2266
 worker_thread+0xef6/0x2450 kernel/workqueue.c:2412
 kthread+0x4b5/0x4f0 kernel/kthread.c:256
 ret_from_fork+0x35/0x40 arch/x86/entry/entry_64.S:353
=====================================================