bisecting fixing commit since d45331b00ddb179e291766617259261c112db872
building syzkaller on 8620c2c2581732b54045bd75ae1220982fbb650f
testing commit d45331b00ddb179e291766617259261c112db872 with gcc (GCC) 8.1.0
kernel signature: f1f068705fbd722045225a0cc7b67802a1f924a7f92e964f9ba69aac96008e11
all runs: crashed: WARNING in untrack_pfn
testing current HEAD 00086336a8d96a04aa960f912287692a258f6cf5
testing commit 00086336a8d96a04aa960f912287692a258f6cf5 with gcc (GCC) 8.1.0
kernel signature: 2f8108decf7ed8fabbf17c78dbf75b8a15361cfcf8c9d03cb4aeb1a720aafc28
run #0: crashed: WARNING in untrack_pfn
run #1: crashed: WARNING in untrack_pfn
run #2: OK
run #3: OK
run #4: OK
run #5: OK
run #6: OK
run #7: OK
run #8: OK
run #9: OK
revisions tested: 2, total time: 25m58.793426374s (build: 11m13.528337971s, test: 14m1.201832428s)
the crash still happens on HEAD
commit msg: Merge tag 'efi-urgent-2020-04-15' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
crash: WARNING in untrack_pfn
RBP: ffffffffffffffff R08: 0000000000000000 R09: 00000000004aa90f
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000004
R13: 00007ffe095a1940 R14: 0000000000000000 R15: 0000000000000000
------------[ cut here ]------------
WARNING: CPU: 1 PID: 14186 at arch/x86/mm/pat/memtype.c:1093 untrack_pfn+0x1cb/0x240 arch/x86/mm/pat/memtype.c:1102
Kernel panic - not syncing: panic_on_warn set ...
CPU: 1 PID: 14186 Comm: syz-executor317 Not tainted 5.7.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x12d/0x187 lib/dump_stack.c:118
 panic+0x22a/0x4e3 kernel/panic.c:221
 __warn.cold.10+0x25/0x2a kernel/panic.c:582
 report_bug+0x1b0/0x270 lib/bug.c:195
 fixup_bug arch/x86/kernel/traps.c:175 [inline]
 do_error_trap+0x11b/0x200 arch/x86/kernel/traps.c:267
 do_invalid_op+0x36/0x40 arch/x86/kernel/traps.c:286
 invalid_op+0x23/0x30 arch/x86/entry/entry_64.S:1027
RIP: 0010:untrack_pfn+0x1cb/0x240 arch/x86/mm/pat/memtype.c:1093
Code: 00 00 00 48 c7 43 08 00 00 00 00 48 8b 45 d8 65 48 33 04 25 28 00 00 00 75 14 48 81 c4 b0 00 00 00 5b 41 5c 41 5d 41 5e 5d c3 <0f> 0b eb c1 e8 ac 01 0f 00 48 89 95 30 ff ff ff 48 89 b5 38 ff ff
RSP: 0018:ffff888092397730 EFLAGS: 00010282
RAX: 00000000ffffffea RBX: 1ffff11012472ee8 RCX: 0000000000000000
RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffffffff8a47b8a0
RBP: ffff888092397800 R08: ffffed101303a2fd R09: ffffed101303a2fd
R10: ffff8880981d17e3 R11: ffffed101303a2fc R12: ffff8880a1553a50
R13: 0000000000000000 R14: ffff8880923977e0 R15: ffff888092397950
 unmap_single_vma+0x144/0x300 mm/memory.c:1291
 unmap_vmas+0x1a0/0x2a0 mm/memory.c:1344
 exit_mmap+0x25e/0x470 mm/mmap.c:3150
 __mmput kernel/fork.c:1085 [inline]
 mmput+0x121/0x410 kernel/fork.c:1106
 dup_mm+0x543/0x1190 kernel/fork.c:1379
 copy_mm kernel/fork.c:1419 [inline]
 copy_process+0x277c/0x6250 kernel/fork.c:2085
 _do_fork+0xec/0xc30 kernel/fork.c:2430
 __do_sys_clone+0xd2/0x110 kernel/fork.c:2585
 __se_sys_clone kernel/fork.c:2566 [inline]
 __x64_sys_clone+0xb9/0x140 kernel/fork.c:2566
 do_syscall_64+0xca/0x630 arch/x86/entry/common.c:295
 entry_SYSCALL_64_after_hwframe+0x49/0xb3
RIP: 0033:0x4432c9
Code: e8 1c 0d 03 00 48 83 c4 18 c3 0f 1f 80 00 00 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 5b 07 fc ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007ffe095a18e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00000000004432c9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffffffffffffff R08: 0000000000000000 R09: 00000000004aa90f
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000004
R13: 00007ffe095a1940 R14: 0000000000000000 R15: 0000000000000000
Kernel Offset: disabled
Rebooting in 86400 seconds..