device veth0_to_bridge entered promiscuous mode
device veth0_to_bridge left promiscuous mode
BUG: unable to handle kernel NULL pointer dereference at 0000000000000050
PGD 80000001a3ae1067 P4D 80000001a3ae1067 PUD 1a3ae0067 PMD 0 
Oops: 0000 [#1] SMP PTI
CPU: 0 PID: 4819 Comm: syz-fuzzer Not tainted 4.19.0-rc1+ #40
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:kmsan_free_page+0xec/0x2d0 mm/kmsan/kmsan_hooks.c:318
Code: 01 00 00 48 c7 00 00 00 00 00 44 39 e1 0f 8d b0 00 00 00 48 63 d1 48 8d 14 52 48 c1 e2 05 48 8b 54 13 40 48 83 c0 60 83 c1 01 <80> 7a 50 00 74 be 0f 0b 66 90 66 2e 0f 1f 84 00 00 00 00 00 eb fe
RSP: 0018:ffff8801a643f6a0 EFLAGS: 00010002
RAX: ffffea000a170168 RBX: ffffea000a170000 RCX: 0000000000000004
RDX: 0000000000000000 RSI: 0000000000000009 RDI: ffffea00067bc000
RBP: ffff8801a643f6e8 R08: 0000000000480020 R09: 0000000000000002
R10: 0000000000000000 R11: ffffffff81c45470 R12: 0000000000000200
R13: ffff8801b8d9bb00 R14: 0000000000000009 R15: ffffea000690c000
FS:  000000c420088768(0000) GS:ffff88021fc00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000050 CR3: 00000001c3b86000 CR4: 00000000001406f0
DR0: 0000000020000000 DR1: 0000000020000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
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 mm/memory.c:433 [inline]
 zap_page_range+0xa13/0xc10 mm/memory.c:1613
 madvise_dontneed_single_vma mm/madvise.c:510 [inline]
 madvise_dontneed_free mm/madvise.c:563 [inline]
 madvise_vma mm/madvise.c:698 [inline]
 __do_sys_madvise mm/madvise.c:873 [inline]
 __se_sys_madvise+0x1a93/0x3700 mm/madvise.c:801
 __x64_sys_madvise+0x4a/0x70 mm/madvise.c:801
 do_syscall_64+0xb8/0x100 arch/x86/entry/common.c:291
 entry_SYSCALL_64_after_hwframe+0x63/0xe7
RIP: 0033:0x45ddc7
Code: 8b 24 24 48 8b 6c 24 10 48 83 c4 18 c3 cc cc cc cc cc cc 48 8b 7c 24 08 48 8b 74 24 10 8b 54 24 18 48 c7 c0 1c 00 00 00 0f 05 <c3> cc cc cc cc cc cc cc cc 48 8b 7c 24 08 8b 74 24 10 8b 54 24 14
RSP: 002b:000000c420137e40 EFLAGS: 00000246 ORIG_RAX: 000000000000001c
RAX: ffffffffffffffda RBX: 00000000009b0000 RCX: 000000000045ddc7
RDX: 0000000000000004 RSI: 00000000009b0000 RDI: 000000c433720000
RBP: 000000c420137e70 R08: 000000c4346d6000 R09: 0000000000001000
R10: 0000000000070000 R11: 0000000000000246 R12: 00000000000004e0
R13: 0000000000000005 R14: 00007f00fe5ca6c8 R15: 0000000000000004
Modules linked in:
Dumping ftrace buffer:
   (ftrace buffer empty)
CR2: 0000000000000050
---[ end trace a063100cd9910024 ]---
RIP: 0010:kmsan_free_page+0xec/0x2d0 mm/kmsan/kmsan_hooks.c:318
Code: 01 00 00 48 c7 00 00 00 00 00 44 39 e1 0f 8d b0 00 00 00 48 63 d1 48 8d 14 52 48 c1 e2 05 48 8b 54 13 40 48 83 c0 60 83 c1 01 <80> 7a 50 00 74 be 0f 0b 66 90 66 2e 0f 1f 84 00 00 00 00 00 eb fe
RSP: 0018:ffff8801a643f6a0 EFLAGS: 00010002
RAX: ffffea000a170168 RBX: ffffea000a170000 RCX: 0000000000000004
RDX: 0000000000000000 RSI: 0000000000000009 RDI: ffffea00067bc000
RBP: ffff8801a643f6e8 R08: 0000000000480020 R09: 0000000000000002
R10: 0000000000000000 R11: ffffffff81c45470 R12: 0000000000000200
R13: ffff8801b8d9bb00 R14: 0000000000000009 R15: ffffea000690c000
FS:  000000c420088768(0000) GS:ffff88021fc00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000050 CR3: 00000001c3b86000 CR4: 00000000001406f0
DR0: 0000000020000000 DR1: 0000000020000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600