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BUG: KMSAN: uninit-value in run_timer_softirq+0x2d/0x50 kernel/time/timer.c:1698
CPU: 1 PID: 23784 Comm: blkid Not tainted 5.3.0-rc7+ #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x191/0x1f0 lib/dump_stack.c:113
 kmsan_report+0x13a/0x2b0 mm/kmsan/kmsan_report.c:108
 __msan_warning+0x73/0xe0 mm/kmsan/kmsan_instr.c:250
 __hlist_del include/linux/list.h:763 [inline]
 detach_timer kernel/time/timer.c:811 [inline]
 expire_timers kernel/time/timer.c:1356 [inline]
 __run_timers+0xb99/0x11a0 kernel/time/timer.c:1685
 run_timer_softirq+0x2d/0x50 kernel/time/timer.c:1698
 __do_softirq+0x4a1/0x83a kernel/softirq.c:293
 invoke_softirq kernel/softirq.c:375 [inline]
 irq_exit+0x230/0x280 kernel/softirq.c:416
 exiting_irq+0xe/0x10 arch/x86/include/asm/apic.h:537
 smp_apic_timer_interrupt+0x48/0x70 arch/x86/kernel/apic/apic.c:1135
 apic_timer_interrupt+0x2e/0x40 arch/x86/entry/entry_64.S:837
 </IRQ>
RIP: 0010:kmsan_alloc_page+0x30e/0x360 mm/kmsan/kmsan_shadow.c:401
Code: c3 50 48 39 c1 7c e5 65 ff 0d 02 ef fe 7d 65 8b 05 fb ee fe 7d 85 c0 75 39 e8 4e 20 38 ff 48 8b 45 b0 48 89 45 a8 ff 75 a8 9d <65> 48 8b 04 25 28 00 00 00 48 3b 45 d0 75 12 44 89 f8 48 83 c4 30
RSP: 0000:ffff8881ca8cf7d0 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: 0000000000000246 RBX: ffffea000a9a1638 RCX: 0000000000000001
RDX: ffffea0008f3d600 RSI: 0000000000000000 RDI: ffffea0008f3d600
RBP: ffff8881ca8cf828 R08: 0000000000000201 R09: ffff88812fd41410
R10: 0000000000000004 R11: ffff88812fd4a2f8 R12: ffffea0008fdc890
R13: 0000000000000001 R14: ffffea0008f3d650 R15: 0000000000000000
 __alloc_pages_nodemask+0x142d/0x5fa0 mm/page_alloc.c:4757
 alloc_pages_vma+0xb54/0x1210 mm/mempolicy.c:2116
 alloc_zeroed_user_highpage_movable include/linux/highmem.h:209 [inline]
 do_anonymous_page mm/memory.c:2995 [inline]
 handle_pte_fault mm/memory.c:3840 [inline]
 __handle_mm_fault mm/memory.c:3966 [inline]
 handle_mm_fault+0x5281/0x9ef0 mm/memory.c:4003
 do_user_addr_fault+0x905/0x1510 arch/x86/mm/fault.c:1461
 __do_page_fault+0x1a2/0x410 arch/x86/mm/fault.c:1526
 do_page_fault+0xbb/0x500 arch/x86/mm/fault.c:1550
 page_fault+0x4e/0x60 arch/x86/entry/entry_64.S:1214
RIP: 0033:0x7f965288ff28
Code: 07 00 00 00 00 48 c7 47 10 00 00 00 00 48 c7 47 18 00 00 00 00 49 89 d5 c7 47 08 ff ff ff ff ba 00 10 00 00 48 89 e6 48 89 ef <e8> 23 fd ff ff 48 85 c0 74 36 31 f6 31 c0 48 89 e7 e8 32 5d ff ff
RSP: 002b:00007ffe2c618310 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 00007ffe2c619350 RCX: 00007ffe2c61a3c8
RDX: 0000000000001000 RSI: 00007ffe2c618310 RDI: 0000000000000700
RBP: 0000000000000700 R08: 00007f96528795a0 R09: 0000000000000000
R10: 0000000000000000 R11: 00007f96528880e0 R12: 00007ffe2c61a3c8
R13: 0000000000000000 R14: 00007f9652aa5820 R15: 00007f965289b2a2

Uninit was created at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:150 [inline]
 kmsan_internal_poison_shadow+0x53/0x100 mm/kmsan/kmsan.c:134
 kmsan_slab_free+0x8d/0x100 mm/kmsan/kmsan_hooks.c:123
 slab_free_freelist_hook mm/slub.c:1472 [inline]
 slab_free mm/slub.c:3038 [inline]
 kfree+0x4c1/0x2db0 mm/slub.c:3980
 skb_free_head net/core/skbuff.c:591 [inline]
 skb_release_data+0x7de/0x9d0 net/core/skbuff.c:611
 skb_release_all net/core/skbuff.c:665 [inline]
 __kfree_skb+0x8a/0x210 net/core/skbuff.c:679
 consume_skb+0x2b0/0x2e0 net/core/skbuff.c:838
 skb_free_datagram+0x52/0x180 net/core/datagram.c:328
 netlink_recvmsg+0xd2d/0x18e0 net/netlink/af_netlink.c:1996
 sock_recvmsg_nosec net/socket.c:871 [inline]
 sock_recvmsg+0x3b3/0x3c0 net/socket.c:889
 ___sys_recvmsg+0x461/0x11e0 net/socket.c:2480
 __sys_recvmsg net/socket.c:2537 [inline]
 __do_sys_recvmsg net/socket.c:2547 [inline]
 __se_sys_recvmsg+0x2fa/0x450 net/socket.c:2544
 __x64_sys_recvmsg+0x4a/0x70 net/socket.c:2544
 do_syscall_64+0xbc/0xf0 arch/x86/entry/common.c:297
 entry_SYSCALL_64_after_hwframe+0x63/0xe7
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