------------[ cut here ]------------
kernel BUG at mm/kmsan/kmsan_hooks.c:420!
invalid opcode: 0000 [#1] SMP
CPU: 1 PID: 6926 Comm: syz-fuzzer Not tainted 4.20.0-rc5+ #111
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:kmsan_free_page+0x27e/0x2a0 mm/kmsan/kmsan_hooks.c:481
Code: c8 90 36 ff 4c 89 7d b8 ff 75 b8 9d 65 48 8b 04 25 28 00 00 00 48 3b 45 d0 75 13 48 83 c4 28 5b 41 5c 41 5d 41 5e 41 5f 5d c3 <0f> 0b 0f 0b e8 69 6d 4f ff 0f 0b 0f 0b 0f 0b 0f 0b 0f 0b 0f 1f 44
RSP: 0018:ffff88819e1fee80 EFLAGS: 00010286
RAX: 0000000000000001 RBX: ffffea0000be8000 RCX: 0000000000000060
RDX: ffff8881fbb71a98 RSI: 0000000000000009 RDI: ffffea0000be8000
RBP: ffff88819e1feed0 R08: ffff888000000000 R09: ffff88819e1fee88
R10: 0000000000000000 R11: ffffffff820c0e60 R12: 0000000000000200
R13: ffffea0000be8071 R14: 0000000000000009 R15: 0000000000000009
FS:  000000c420026068(0000) GS:ffff88821fd00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffff600400 CR3: 000000015fd83000 CR4: 00000000001426e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 free_pages_prepare mm/page_alloc.c:997 [inline]
 __free_pages_ok+0x2f7/0x1080 mm/page_alloc.c:1260
 free_compound_page+0xac/0xe0 mm/page_alloc.c:575
 free_transhuge_page+0x3bd/0x470 mm/huge_memory.c:2764
 __put_compound_page mm/swap.c:95 [inline]
 release_pages+0xd3f/0x1840 mm/swap.c:759
 free_pages_and_swap_cache+0x553/0x590 mm/swap_state.c:295
 tlb_flush_mmu_free+0xd5/0x1f0 mm/mmu_gather.c:84
 zap_pte_range mm/memory.c:1159 [inline]
 zap_pmd_range mm/memory.c:1194 [inline]
 zap_pud_range mm/memory.c:1223 [inline]
 zap_p4d_range mm/memory.c:1244 [inline]
 unmap_page_range+0x3163/0x39a0 mm/memory.c:1265
 unmap_single_vma+0x43f/0x5e0 mm/memory.c:1310
 unmap_vmas+0x251/0x380 mm/memory.c:1340
 exit_mmap+0x52e/0xa20 mm/mmap.c:3145
 __mmput+0x184/0x6c0 kernel/fork.c:1047
 mmput+0x12d/0x1a0 kernel/fork.c:1068
 exit_mm+0x95d/0xb20 kernel/exit.c:546
 do_exit+0xff0/0x3e80 kernel/exit.c:856
 do_group_exit+0x1a7/0x350 kernel/exit.c:972
 get_signal+0x118f/0x22c0 kernel/signal.c:2517
 do_signal+0x1d5/0x2f10 arch/x86/kernel/signal.c:816
 exit_to_usermode_loop arch/x86/entry/common.c:162 [inline]
 prepare_exit_to_usermode+0x26b/0x460 arch/x86/entry/common.c:197
 syscall_return_slowpath+0xd8/0x6f0 arch/x86/entry/common.c:268
 do_syscall_64+0xf3/0x110 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x63/0xe7
RIP: 0033:0x45d911
Code: Bad RIP value.
RSP: 002b:000000c420035f18 EFLAGS: 00000246 ORIG_RAX: 000000000000010e
RAX: fffffffffffffdfe RBX: 0000000000000013 RCX: 000000000045d911
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 000000c420035f28 R08: 000000c420035f18 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000430120
R13: 00000000000000f1 R14: 0000000000000011 R15: 0000000000000000
Modules linked in:
---[ end trace 22c6725b45e1e687 ]---
RIP: 0010:kmsan_free_page+0x27e/0x2a0 mm/kmsan/kmsan_hooks.c:481
Code: c8 90 36 ff 4c 89 7d b8 ff 75 b8 9d 65 48 8b 04 25 28 00 00 00 48 3b 45 d0 75 13 48 83 c4 28 5b 41 5c 41 5d 41 5e 41 5f 5d c3 <0f> 0b 0f 0b e8 69 6d 4f ff 0f 0b 0f 0b 0f 0b 0f 0b 0f 0b 0f 1f 44
RSP: 0018:ffff88819e1fee80 EFLAGS: 00010286
RAX: 0000000000000001 RBX: ffffea0000be8000 RCX: 0000000000000060
RDX: ffff8881fbb71a98 RSI: 0000000000000009 RDI: ffffea0000be8000
RBP: ffff88819e1feed0 R08: ffff888000000000 R09: ffff88819e1fee88
R10: 0000000000000000 R11: ffffffff820c0e60 R12: 0000000000000200
R13: ffffea0000be8071 R14: 0000000000000009 R15: 0000000000000009
FS:  000000c420026068(0000) GS:ffff88821fd00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000000045d8e7 CR3: 000000015fd83000 CR4: 00000000001426e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400