bisecting fixing commit since 893af1c79e42e53af0da22165b46eea135af0613 building syzkaller on acb51638141ff960f547431757130749bc176bc0 testing commit 893af1c79e42e53af0da22165b46eea135af0613 with gcc (GCC) 8.1.0 kernel signature: da829d1996da2bb7cfd13f774aad9cde06f3864152504ad472b4bd99b27f2d9b run #0: crashed: WARNING in untrack_pfn run #1: crashed: WARNING in corrupted run #2: crashed: WARNING in corrupted run #3: crashed: WARNING in corrupted run #4: crashed: WARNING in corrupted run #5: crashed: WARNING in corrupted run #6: crashed: WARNING in unmap_single_vma run #7: crashed: WARNING in corrupted run #8: crashed: WARNING in corrupted run #9: crashed: WARNING in corrupted testing current HEAD 106fa147d3daa58d2c1ae5f41a29d07036fe7d0a testing commit 106fa147d3daa58d2c1ae5f41a29d07036fe7d0a with gcc (GCC) 8.1.0 kernel signature: 88f456eb70c726e0f7fac404eb255d5cf91f1b4e57d4146e4370d137320e467f run #0: crashed: WARNING in corrupted run #1: crashed: WARNING in corrupted run #2: crashed: WARNING in corrupted run #3: crashed: WARNING in corrupted run #4: crashed: WARNING in corrupted run #5: crashed: WARNING in corrupted run #6: crashed: WARNING in corrupted run #7: crashed: WARNING in corrupted run #8: crashed: WARNING in corrupted run #9: crashed: WARNING in unmap_single_vma revisions tested: 2, total time: 26m41.952488579s (build: 17m42.580248605s, test: 8m7.482046784s) the crash still happens on HEAD commit msg: Linux 4.19.127 crash: WARNING in unmap_single_vma __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x123/0x177 lib/dump_stack.c:118 fail_dump lib/fault-inject.c:51 [inline] should_fail.cold.4+0x5/0x13 lib/fault-inject.c:149 __should_failslab+0xba/0xf0 mm/failslab.c:32 should_failslab+0x9/0x14 mm/slab_common.c:1558 slab_pre_alloc_hook mm/slab.h:424 [inline] slab_alloc mm/slab.c:3383 [inline] kmem_cache_alloc+0x2bc/0x730 mm/slab.c:3557 WARNING: CPU: 1 PID: 7434 at arch/x86/mm/pat.c:1064 untrack_pfn+0x1cb/0x240 arch/x86/mm/pat.c:1073 ptlock_alloc+0x1d/0x70 mm/memory.c:4833 Kernel panic - not syncing: panic_on_warn set ... ptlock_init include/linux/mm.h:1896 [inline] pgtable_page_ctor include/linux/mm.h:1930 [inline] pte_alloc_one+0x4e/0x130 arch/x86/mm/pgtable.c:38 __pte_alloc+0x1d/0x2f0 mm/memory.c:653 copy_pte_range mm/memory.c:1077 [inline] copy_pmd_range mm/memory.c:1153 [inline] copy_pud_range mm/memory.c:1187 [inline] copy_p4d_range mm/memory.c:1209 [inline] copy_page_range+0xef1/0x1890 mm/memory.c:1271 dup_mmap kernel/fork.c:549 [inline] dup_mm kernel/fork.c:1288 [inline] copy_mm kernel/fork.c:1344 [inline] copy_process.part.34+0x38a1/0x7370 kernel/fork.c:1897 copy_process kernel/fork.c:1694 [inline] _do_fork+0x15d/0xba0 kernel/fork.c:2207 __do_sys_clone kernel/fork.c:2314 [inline] __se_sys_clone kernel/fork.c:2308 [inline] __x64_sys_clone+0xba/0x140 kernel/fork.c:2308 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x459829 Code: fd b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 cb b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f4c0c832c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000038 RAX: ffffffffffffffda RBX: 00007f4c0c832c90 RCX: 0000000000459829 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f4c0c8336d4 R13: 00000000004bfce6 R14: 00000000004d1a38 R15: 0000000000000004 CPU: 1 PID: 7434 Comm: syz-executor.3 Not tainted 4.19.127-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+0x123/0x177 lib/dump_stack.c:118 panic+0x1cd/0x375 kernel/panic.c:186 __warn.cold.8+0x1b/0x3e kernel/panic.c:541 report_bug+0x1a4/0x200 lib/bug.c:186 fixup_bug arch/x86/kernel/traps.c:178 [inline] do_error_trap+0x200/0x350 arch/x86/kernel/traps.c:296 do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:316 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:1038 RIP: 0010:untrack_pfn+0x1cb/0x240 arch/x86/mm/pat.c:1064 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 6c a4 0d 00 48 89 95 30 ff ff ff 48 89 b5 38 ff ff RSP: 0018:ffff8880819d78b8 EFLAGS: 00010282 RAX: 00000000ffffffea RBX: 1ffff1101033af19 RCX: 0000000000000000 RDX: 0000000000000004 RSI: 0000000000000004 RDI: ffffffff89c8d6a0 RBP: ffff8880819d7988 R08: ffffed10151f346f R09: ffffed10151f346e R10: ffffed10151f346e R11: ffff8880a8f9a373 R12: ffff88808b71d460 R13: 0000000000000000 R14: ffff8880819d7968 R15: ffff8880819d7a58 unmap_single_vma+0x144/0x300 mm/memory.c:1535 unmap_vmas+0xe7/0x1a0 mm/memory.c:1586 exit_mmap+0x251/0x450 mm/mmap.c:3091 __mmput kernel/fork.c:1015 [inline] mmput+0x107/0x3f0 kernel/fork.c:1036 dup_mm kernel/fork.c:1304 [inline] copy_mm kernel/fork.c:1344 [inline] copy_process.part.34+0x2d0a/0x7370 kernel/fork.c:1897 copy_process kernel/fork.c:1694 [inline] _do_fork+0x15d/0xba0 kernel/fork.c:2207 __do_sys_clone kernel/fork.c:2314 [inline] __se_sys_clone kernel/fork.c:2308 [inline] __x64_sys_clone+0xba/0x140 kernel/fork.c:2308 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x459829 Code: fd b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 cb b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f9b46e99c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000038 RAX: ffffffffffffffda RBX: 00007f9b46e99c90 RCX: 0000000000459829 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f9b46e9a6d4 R13: 00000000004bfce6 R14: 00000000004d1a38 R15: 0000000000000004 CPU: 0 PID: 7427 Comm: syz-executor.2 Not tainted 4.19.127-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+0x123/0x177 lib/dump_stack.c:118 fail_dump lib/fault-inject.c:51 [inline] should_fail.cold.4+0x5/0x13 lib/fault-inject.c:149 __should_failslab+0xba/0xf0 mm/failslab.c:32 should_failslab+0x9/0x14 mm/slab_common.c:1558 slab_pre_alloc_hook mm/slab.h:424 [inline] slab_alloc mm/slab.c:3383 [inline] kmem_cache_alloc+0x2bc/0x730 mm/slab.c:3557 ptlock_alloc+0x1d/0x70 mm/memory.c:4833 ptlock_init include/linux/mm.h:1896 [inline] pgtable_page_ctor include/linux/mm.h:1930 [inline] pte_alloc_one+0x4e/0x130 arch/x86/mm/pgtable.c:38 copy_huge_pmd+0x69/0x510 mm/huge_memory.c:966 copy_pmd_range mm/memory.c:1143 [inline] copy_pud_range mm/memory.c:1187 [inline] copy_p4d_range mm/memory.c:1209 [inline] copy_page_range+0x597/0x1890 mm/memory.c:1271 dup_mmap kernel/fork.c:549 [inline] dup_mm kernel/fork.c:1288 [inline] copy_mm kernel/fork.c:1344 [inline] copy_process.part.34+0x38a1/0x7370 kernel/fork.c:1897 copy_process kernel/fork.c:1694 [inline] _do_fork+0x15d/0xba0 kernel/fork.c:2207 __do_sys_clone kernel/fork.c:2314 [inline] __se_sys_clone kernel/fork.c:2308 [inline] __x64_sys_clone+0xba/0x140 kernel/fork.c:2308 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x459829 Code: fd b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 cb b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fac69ac8c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000038 RAX: ffffffffffffffda RBX: 00007fac69ac8c90 RCX: 0000000000459829 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fac69ac96d4 R13: 00000000004bfce6 R14: 00000000004d1a38 R15: 0000000000000004 Kernel Offset: disabled Rebooting in 86400 seconds..