------------[ cut here ]------------
kernel BUG at mm/kmsan/kmsan_hooks.c:268!
invalid opcode: 0000 [#1] SMP PTI
CPU: 1 PID: 4271 Comm: syz-fuzzer Not tainted 4.19.0-rc1+ #42
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:kmsan_free_page+0x281/0x2d0 mm/kmsan/kmsan_hooks.c:329
Code: 7d d0 83 c0 ff 41 89 85 f4 08 00 00 75 59 e8 e6 95 49 ff 4c 89 7d c0 ff 75 c0 9d 48 83 c4 20 5b 41 5c 41 5d 41 5e 41 5f 5d c3 <0f> 0b 0f 1f 00 66 2e 0f 1f 84 00 00 00 00 00 eb fe 0f 0b 66 90 66
RSP: 0018:ffff8801ad8df100 EFLAGS: 00010282
RAX: 0000000000000065 RBX: ffffea0006176630 RCX: 0000000000000009
RDX: ffff8801ff8143d8 RSI: 0000000000000009 RDI: ffffea0006174000
RBP: ffff8801ad8df148 R08: 0000000000480020 R09: 0000000000000002
R10: 0000000000000000 R11: ffffffff81c45470 R12: 0000000000000200
R13: 0000000000000009 R14: 0000000000000009 R15: ffff8801c706c400
FS:  000000c420027568(0000) GS:ffff88021fd00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000005e6bb0 CR3: 0000000009c30000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 free_pages_prepare mm/page_alloc.c:994 [inline]
 __free_pages_ok+0x25a/0x16c0 mm/page_alloc.c:1252
 free_compound_page+0x8b/0xc0 mm/page_alloc.c:572
 free_transhuge_page+0x3af/0x460 mm/huge_memory.c:2733
 __put_compound_page mm/swap.c:96 [inline]
 release_pages+0x70c/0x1650 mm/swap.c:760
 free_pages_and_swap_cache+0x54b/0x570 mm/swap_state.c:319
 tlb_flush_mmu_free mm/memory.c:250 [inline]
 tlb_flush_mmu+0x504/0x6b0 mm/memory.c:259
 arch_tlb_finish_mmu mm/memory.c:274 [inline]
 tlb_finish_mmu+0x205/0x420 mm/memory.c:433
 exit_mmap+0x519/0x940 mm/mmap.c:3095
 __mmput+0x154/0x5f0 kernel/fork.c:1003
 mmput+0xa7/0xe0 kernel/fork.c:1024
 exit_mm+0x6dd/0x790 kernel/exit.c:546
 do_exit+0xbf7/0x3890 kernel/exit.c:856
 do_group_exit+0x1a0/0x350 kernel/exit.c:972
 get_signal+0x1425/0x1ef0 kernel/signal.c:2513
 do_signal+0x11d/0x2060 arch/x86/kernel/signal.c:816
 exit_to_usermode_loop arch/x86/entry/common.c:162 [inline]
 prepare_exit_to_usermode+0x273/0x410 arch/x86/entry/common.c:197
 syscall_return_slowpath+0xdb/0x700 arch/x86/entry/common.c:268
 do_syscall_64+0xde/0x100 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x63/0xe7
RIP: 0033:0x45ddf3
Code: Bad RIP value.
RSP: 002b:000000c420031de8 EFLAGS: 00000286 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 000000c420027500 RCX: 000000000045ddf3
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000000c420027610
RBP: 000000c420031e30 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000286 R12: 0000000000000001
R13: 000000c42cb243c0 R14: 0000000000000001 R15: 0000000000000000
Modules linked in:
Dumping ftrace buffer:
   (ftrace buffer empty)
---[ end trace e57455e50dbcb54e ]---
RIP: 0010:kmsan_free_page+0x281/0x2d0 mm/kmsan/kmsan_hooks.c:329
Code: 7d d0 83 c0 ff 41 89 85 f4 08 00 00 75 59 e8 e6 95 49 ff 4c 89 7d c0 ff 75 c0 9d 48 83 c4 20 5b 41 5c 41 5d 41 5e 41 5f 5d c3 <0f> 0b 0f 1f 00 66 2e 0f 1f 84 00 00 00 00 00 eb fe 0f 0b 66 90 66
RSP: 0018:ffff8801ad8df100 EFLAGS: 00010282
RAX: 0000000000000065 RBX: ffffea0006176630 RCX: 0000000000000009
RDX: ffff8801ff8143d8 RSI: 0000000000000009 RDI: ffffea0006174000
RBP: ffff8801ad8df148 R08: 0000000000480020 R09: 0000000000000002
R10: 0000000000000000 R11: ffffffff81c45470 R12: 0000000000000200
R13: 0000000000000009 R14: 0000000000000009 R15: ffff8801c706c400
FS:  000000c420027568(0000) GS:ffff88021fd00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000000045ddc9 CR3: 0000000009c30000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400