bisecting fixing commit since 45f092f9e9cb31486db546e39bfe7cc0b3f57099
building syzkaller on ca6f3cfa782bb9aa9e1cb1247a2a4632608ab368
testing commit 45f092f9e9cb31486db546e39bfe7cc0b3f57099 with gcc (GCC) 8.1.0
kernel signature: 413b4c3b47bfdacd183287a7a25592f45b1f1d17ad91233e540614c9ca5ca492
run #0: crashed: WARNING in corrupted
run #1: OK
run #2: OK
run #3: OK
run #4: OK
run #5: OK
run #6: OK
run #7: OK
run #8: OK
run #9: OK
testing current HEAD 12cd844a39ed16aa183a820a54fe6f9a0bb4cd14
testing commit 12cd844a39ed16aa183a820a54fe6f9a0bb4cd14 with gcc (GCC) 8.1.0
kernel signature: d8de3f3d2644d980d8a94b17acb19f6b02013944c1c0d3d0e07b294d2e332233
run #0: crashed: WARNING in untrack_pfn
run #1: OK
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: 37m46.439605088s (build: 16m44.29327542s, test: 19m51.453902207s)
the crash still happens on HEAD
commit msg: Linux 4.14.173
crash: WARNING in untrack_pfn
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fdd2c3546d4
R13: 00000000004bfce6 R14: 00000000004d1a58 R15: 0000000000000005
------------[ cut here ]------------
FAULT_INJECTION: forcing a failure.
name fail_page_alloc, interval 1, probability 0, space 0, times 0
WARNING: CPU: 0 PID: 7095 at arch/x86/mm/pat.c:1020 untrack_pfn+0x1ab/0x210 arch/x86/mm/pat.c:1027
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 7095 Comm: syz-executor.3 Not tainted 4.14.173-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0xf7/0x13b lib/dump_stack.c:58
 panic+0x1b0/0x358 kernel/panic.c:183
 __warn.cold.8+0x25/0x2c kernel/panic.c:547
 report_bug+0x1a4/0x1f3 lib/bug.c:186
 fixup_bug arch/x86/kernel/traps.c:177 [inline]
 do_error_trap+0x1bd/0x310 arch/x86/kernel/traps.c:295
 do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:314
 invalid_op+0x1b/0x40 arch/x86/entry/entry_64.S:963
RIP: 0010:untrack_pfn+0x1ab/0x210 arch/x86/mm/pat.c:1020
RSP: 0018:ffff8880881cf8f8 EFLAGS: 00010282
RAX: 00000000ffffffea RBX: ffff888092fa9000 RCX: 0000000000000000
RDX: 0000000000000004 RSI: 0000000000000001 RDI: ffffffff89383800
RBP: ffff8880881cf9c8 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: ffff8880a85c4400 R12: 1ffff11011039f21
R13: 0000000000000000 R14: ffff8880881cf9a8 R15: ffff8880881cfa98
 unmap_single_vma+0x144/0x300 mm/memory.c:1539
 unmap_vmas+0xe2/0x190 mm/memory.c:1590
 exit_mmap+0x249/0x450 mm/mmap.c:3056
 __mmput kernel/fork.c:930 [inline]
 mmput+0xed/0x3c0 kernel/fork.c:951
 dup_mm kernel/fork.c:1215 [inline]
 copy_mm kernel/fork.c:1254 [inline]
 copy_process.part.37+0x5d6f/0x66e0 kernel/fork.c:1771
 copy_process kernel/fork.c:1586 [inline]
 _do_fork+0x155/0xbb0 kernel/fork.c:2070
 SYSC_clone kernel/fork.c:2180 [inline]
 SyS_clone+0x14/0x20 kernel/fork.c:2174
 do_syscall_64+0x1c7/0x5b0 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x459829
RSP: 002b:00007fdd2c353c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007fdd2c353c90 RCX: 0000000000459829
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fdd2c3546d4
R13: 00000000004bfce6 R14: 00000000004d1a58 R15: 0000000000000005
CPU: 1 PID: 7099 Comm: syz-executor.1 Not tainted 4.14.173-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0xf7/0x13b lib/dump_stack.c:58
 fail_dump lib/fault-inject.c:51 [inline]
 should_fail.cold.3+0x105/0x14b lib/fault-inject.c:149
 should_fail_alloc_page mm/page_alloc.c:2891 [inline]
 prepare_alloc_pages mm/page_alloc.c:4124 [inline]
 __alloc_pages_nodemask+0x1d5/0x770 mm/page_alloc.c:4172
 alloc_pages_current+0xd6/0x1b0 mm/mempolicy.c:2113
 alloc_pages include/linux/gfp.h:520 [inline]
 pte_alloc_one+0x14/0xd0 arch/x86/mm/pgtable.c:30
 __pte_alloc+0x1d/0x280 mm/memory.c:656
 copy_pte_range mm/memory.c:1081 [inline]
 copy_pmd_range mm/memory.c:1157 [inline]
 copy_pud_range mm/memory.c:1191 [inline]
 copy_p4d_range mm/memory.c:1213 [inline]
 copy_page_range+0xfed/0x1970 mm/memory.c:1275
 dup_mmap kernel/fork.c:709 [inline]
 dup_mm kernel/fork.c:1199 [inline]
 copy_mm kernel/fork.c:1254 [inline]
 copy_process.part.37+0x5d91/0x66e0 kernel/fork.c:1771
 copy_process kernel/fork.c:1586 [inline]
 _do_fork+0x155/0xbb0 kernel/fork.c:2070
 SYSC_clone kernel/fork.c:2180 [inline]
 SyS_clone+0x14/0x20 kernel/fork.c:2174
 do_syscall_64+0x1c7/0x5b0 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x459829
RSP: 002b:00007fa3189b5c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007fa3189b5c90 RCX: 0000000000459829
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 000000000075bfc8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fa3189b66d4
R13: 00000000004bfce6 R14: 00000000004d1a58 R15: 0000000000000005
Kernel Offset: disabled
Rebooting in 86400 seconds..