bisecting fixing commit since 1bab61d3e8cd96f2badf515dcb06e4e1029bc017
building syzkaller on 4afdfa205b55633e7eb9db03a9d099d7aa324801
testing commit 1bab61d3e8cd96f2badf515dcb06e4e1029bc017 with gcc (GCC) 8.4.1 20210217
kernel signature: 139905e876886df55d6b4af6c0d2170521fc4e9657450e8d7f0df5533c42805b
all runs: crashed: kernel BUG in __handle_mm_fault
testing current HEAD 78fec1611cbf7b0bdaddfdbf174a3a2463663bff
testing commit 78fec1611cbf7b0bdaddfdbf174a3a2463663bff with gcc (GCC) 8.4.1 20210217
kernel signature: ee491f84fcb7f8049cb0f076b91745c3c2ae493f42f76d1eb1ad7f7bc187695d
all runs: crashed: kernel BUG in __handle_mm_fault
revisions tested: 2, total time: 23m20.325173604s (build: 16m45.431566681s, test: 6m1.338250117s)
the crash still happens on HEAD
commit msg: Linux 4.19.183
crash: kernel BUG in __handle_mm_fault
next ffff8881d7d1f250 prev ffff8881d7d1f358 mm ffff8881d94d4800
prot 25 anon_vma 0000000000000000 vm_ops ffffffff87310ea0
pgoff 0 file ffff8881f4621040 private_data 0000000000000000
flags: 0xfe(write|exec|shared|mayread|maywrite|mayexec|mayshare)
------------[ cut here ]------------
kernel BUG at mm/memory.c:4040!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 7205 Comm: syz-executor.4 Not tainted 4.19.183-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:wp_huge_pmd mm/memory.c:4040 [inline]
RIP: 0010:__handle_mm_fault+0x2192/0x4100 mm/memory.c:4248
Code: 00 00 00 4c 89 f7 e8 dd ef 09 00 f0 41 ff 0e 0f 85 54 ec ff ff 48 89 df e8 cb eb f5 ff e9 47 ec ff ff 48 89 df e8 0b e5 39 05 <0f> 0b 49 8d 84 24 60 ff ff ff 48 89 c7 e8 cc d8 0b 00 41 89 c7 e9
RSP: 0018:ffff8881d7fdfcc8 EFLAGS: 00010296
RAX: 0000000000000137 RBX: ffff8881d7980840 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff876789c0 RDI: ffffffff8a194aa0
RBP: ffff8881d7fdfde8 R08: ffffed103ed25081 R09: ffffed103ed25080
R10: ffffed103ed25080 R11: ffff8881f6928407 R12: ffff8881d7fdfdc0
R13: 1ffff1103affbfa0 R14: ffffffff87310ea0 R15: 0000000000000080
FS:  0000000001fe0400(0000) GS:ffff8881f6900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000200001c0 CR3: 00000001e97dd004 CR4: 00000000001606e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 handle_mm_fault+0x3dd/0x8b0 mm/memory.c:4295
 __do_page_fault+0x50e/0xb30 arch/x86/mm/fault.c:1412
 do_page_fault+0x64/0x3b0 arch/x86/mm/fault.c:1487
 page_fault+0x1e/0x30 arch/x86/entry/entry_64.S:1205
RIP: 0033:0x45fb08
Code: d1 f3 a4 c3 80 fa 10 73 17 80 fa 08 73 27 80 fa 04 73 33 80 fa 01 77 3b 72 05 0f b6 0e 88 0f c3 c5 fa 6f 06 c5 fa 6f 4c 16 f0 <c5> fa 7f 07 c5 fa 7f 4c 17 f0 c3 48 8b 4c 16 f8 48 8b 36 48 89 4c
RSP: 002b:00007ffc7a7cc258 EFLAGS: 00010206
RAX: 00000000200001c0 RBX: 000000000055c900 RCX: 0000000000960000
RDX: 0000000000000013 RSI: 0000000000560398 RDI: 00000000200001c0
RBP: 00007ffc7a7cc2f8 R08: 0000000000560278 R09: 0000000000000000
R10: 00007ffc7a7cc310 R11: 0000000000000246 R12: 00000000000003e8
R13: 000000000055bfac R14: 000000000055bf00 R15: 000000000055bfa0
Modules linked in:
---[ end trace 8ac45d9c60ee2d09 ]---
RIP: 0010:wp_huge_pmd mm/memory.c:4040 [inline]
RIP: 0010:__handle_mm_fault+0x2192/0x4100 mm/memory.c:4248
Code: 00 00 00 4c 89 f7 e8 dd ef 09 00 f0 41 ff 0e 0f 85 54 ec ff ff 48 89 df e8 cb eb f5 ff e9 47 ec ff ff 48 89 df e8 0b e5 39 05 <0f> 0b 49 8d 84 24 60 ff ff ff 48 89 c7 e8 cc d8 0b 00 41 89 c7 e9
RSP: 0018:ffff8881d7fdfcc8 EFLAGS: 00010296
RAX: 0000000000000137 RBX: ffff8881d7980840 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff876789c0 RDI: ffffffff8a194aa0
RBP: ffff8881d7fdfde8 R08: ffffed103ed25081 R09: ffffed103ed25080
R10: ffffed103ed25080 R11: ffff8881f6928407 R12: ffff8881d7fdfdc0
R13: 1ffff1103affbfa0 R14: ffffffff87310ea0 R15: 0000000000000080
FS:  0000000001fe0400(0000) GS:ffff8881f6900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000200001c0 CR3: 00000001e97dd005 CR4: 00000000001606e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400