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BUG: KMSAN: uninit-value in run_timer_softirq+0x2d/0x50 kernel/time/timer.c:1698
CPU: 1 PID: 12518 Comm: syz-executor.5 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:_raw_spin_unlock_irqrestore+0x4b/0x70 kernel/locking/spinlock.c:192
Code: 00 8b b8 88 0c 00 00 48 8b 00 48 85 c0 75 28 48 89 df e8 88 85 b1 f3 c6 00 00 c6 03 00 4d 85 e4 75 1c 4c 89 7d d8 ff 75 d8 9d <48> 83 c4 08 5b 41 5c 41 5e 41 5f 5d c3 e8 13 8d b1 f3 eb d1 44 89
RSP: 0018:ffff8881dfb5fc50 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13
RAX: ffff88821fc91580 RBX: ffff88812fd37580 RCX: ccccccccccccd000
RDX: ffff88821fbb0580 RSI: ffffea000a9eed50 RDI: 000000012fd37580
RBP: ffff8881dfb5fc78 R08: 0000000000000000 R09: ffff8881dfb6fe90
R10: 000000a45c2ba39f R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000282
 unlock_hrtimer_base kernel/time/hrtimer.c:877 [inline]
 hrtimer_start_range_ns+0x1570/0x16b0 kernel/time/hrtimer.c:1108
 hrtimer_start_expires include/linux/hrtimer.h:395 [inline]
 do_nanosleep+0x226/0x990 kernel/time/hrtimer.c:1676
 hrtimer_nanosleep kernel/time/hrtimer.c:1733 [inline]
 __do_sys_nanosleep kernel/time/hrtimer.c:1767 [inline]
 __se_sys_nanosleep+0x6e2/0x900 kernel/time/hrtimer.c:1754
 __x64_sys_nanosleep+0x3e/0x60 kernel/time/hrtimer.c:1754
 do_syscall_64+0xbc/0xf0 arch/x86/entry/common.c:297
 entry_SYSCALL_64_after_hwframe+0x63/0xe7
RIP: 0033:0x457ed0
Code: c0 5b 5d c3 66 0f 1f 44 00 00 8b 04 24 48 83 c4 18 5b 5d c3 66 0f 1f 44 00 00 83 3d 81 e8 61 00 00 75 14 b8 23 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 24 d3 fb ff c3 48 83 ec 08 e8 ea 46 00 00
RSP: 002b:0000000000a6fd88 EFLAGS: 00000246 ORIG_RAX: 0000000000000023
RAX: ffffffffffffffda RBX: 00000000000ac46c RCX: 0000000000457ed0
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000a6fd90
RBP: 00000000000004a1 R08: 0000000000000001 R09: 00005555573b6940
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002
R13: 0000000000a6fde0 R14: 00000000000ac0b5 R15: 0000000000a6fdf0

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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