bisecting fixing commit since 01fd1694b93c92ad54fa684dac9c8068ecda8288 building syzkaller on 040fda588472da50749a3f605e183ad5c02104f4 testing commit 01fd1694b93c92ad54fa684dac9c8068ecda8288 with gcc (GCC) 8.1.0 kernel signature: 7afed90194610f3704dbfb353532f7fcb069f7f8c5b5a7658123f98ba6748c1d run #0: crashed: WARNING in corrupted run #1: crashed: WARNING in untrack_pfn run #2: crashed: WARNING in untrack_pfn run #3: crashed: WARNING in untrack_pfn run #4: crashed: WARNING in untrack_pfn run #5: crashed: WARNING in untrack_pfn run #6: crashed: WARNING in untrack_pfn run #7: crashed: WARNING in corrupted run #8: crashed: WARNING in unmap_single_vma run #9: crashed: WARNING in corrupted testing current HEAD b850307b279cbd12ab8c654d1a3dfe55319cc475 testing commit b850307b279cbd12ab8c654d1a3dfe55319cc475 with gcc (GCC) 8.1.0 kernel signature: b5737ee9930fe05c8407ff55b10962af1c1fe2c5153ec8e305bde9ad7b3b4a3b run #0: crashed: WARNING in untrack_pfn run #1: crashed: WARNING in corrupted run #2: crashed: WARNING in unmap_single_vma run #3: crashed: WARNING in untrack_pfn run #4: crashed: WARNING in corrupted run #5: crashed: WARNING in corrupted run #6: crashed: WARNING in corrupted run #7: crashed: WARNING in unmap_single_vma run #8: crashed: WARNING in corrupted run #9: crashed: WARNING in corrupted revisions tested: 2, total time: 25m40.669312935s (build: 18m41.141689153s, test: 6m9.076560987s) the crash still happens on HEAD commit msg: Linux 4.14.184 crash: WARNING in corrupted R13: 00000000004bfd46 R14: 00000000004d1af8 R15: 0000000000000004 CPU: 1 PID: 7265 Comm: syz-executor.2 Not tainted 4.14.184-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ------------[ cut here ]------------ Call Trace: WARNING: CPU: 0 PID: 7244 at arch/x86/mm/pat.c:1020 untrack_pfn+0x1ab/0x210 arch/x86/mm/pat.c:1027 __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0xf7/0x13b lib/dump_stack.c:58 Kernel panic - not syncing: panic_on_warn set ... fail_dump lib/fault-inject.c:51 [inline] should_fail.cold.3+0x105/0x14b lib/fault-inject.c:149 should_failslab+0xba/0xf0 mm/failslab.c:32 slab_pre_alloc_hook mm/slab.h:421 [inline] slab_alloc mm/slab.c:3376 [inline] kmem_cache_alloc+0x2cf/0x790 mm/slab.c:3550 anon_vma_alloc mm/rmap.c:82 [inline] anon_vma_fork+0xd0/0x4c0 mm/rmap.c:341 dup_mmap kernel/fork.c:664 [inline] dup_mm kernel/fork.c:1199 [inline] copy_mm kernel/fork.c:1254 [inline] copy_process.part.37+0x5bf8/0x66c0 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+0x46/0xbb RIP: 0033:0x459879 RSP: 002b:00007fdf795c4c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000038 RAX: ffffffffffffffda RBX: 00007fdf795c4c90 RCX: 0000000000459879 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 000000000075c070 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fdf795c56d4 R13: 00000000004bfd46 R14: 00000000004d1af8 R15: 0000000000000004 CPU: 0 PID: 7244 Comm: syz-executor.1 Not tainted 4.14.184-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:964 RIP: 0010:untrack_pfn+0x1ab/0x210 arch/x86/mm/pat.c:1020 RSP: 0018:ffff8880909bf8f8 EFLAGS: 00010282 RAX: 00000000ffffffea RBX: ffff88808e478148 RCX: 0000000000000000 RDX: 0000000000000004 RSI: 0000000000000001 RDI: ffffffff89387800 RBP: ffff8880909bf9c8 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000000 R11: ffff88808ceee3c0 R12: 1ffff11012137f21 R13: 0000000000000000 R14: ffff8880909bf9a8 R15: ffff8880909bfa98 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+0x5d4e/0x66c0 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+0x46/0xbb RIP: 0033:0x459879 RSP: 002b:00007f155dbb3c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000038 RAX: ffffffffffffffda RBX: 00007f155dbb3c90 RCX: 0000000000459879 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f155dbb46d4 R13: 00000000004bfd46 R14: 00000000004d1af8 R15: 0000000000000004 CPU: 1 PID: 7269 Comm: syz-executor.5 Not tainted 4.14.184-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_failslab+0xba/0xf0 mm/failslab.c:32 slab_pre_alloc_hook mm/slab.h:421 [inline] slab_alloc mm/slab.c:3376 [inline] kmem_cache_alloc+0x2cf/0x790 mm/slab.c:3550 dup_mmap kernel/fork.c:647 [inline] dup_mm kernel/fork.c:1199 [inline] copy_mm kernel/fork.c:1254 [inline] copy_process.part.37+0x5a6c/0x66c0 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+0x46/0xbb RIP: 0033:0x459879 RSP: 002b:00007fe707c9bc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000038 RAX: ffffffffffffffda RBX: 00007fe707c9bc90 RCX: 0000000000459879 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 000000000075bfc8 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fe707c9c6d4 R13: 00000000004bfd46 R14: 00000000004d1af8 R15: 0000000000000004 Kernel Offset: disabled Rebooting in 86400 seconds..