bisecting fixing commit since 893af1c79e42e53af0da22165b46eea135af0613 building syzkaller on acb51638141ff960f547431757130749bc176bc0 testing commit 893af1c79e42e53af0da22165b46eea135af0613 with gcc (GCC) 8.1.0 kernel signature: ce9e0e7456fc8ac574868e3f31127bbef91de91f51c0e71b95b6ded118bcf2ee all runs: crashed: WARNING in corrupted testing current HEAD 5692097116094a4a7045abcc1dbc172dbdc5657e testing commit 5692097116094a4a7045abcc1dbc172dbdc5657e with gcc (GCC) 8.1.0 kernel signature: 538ff81df0c2e91cb985819c7faf00d0ce289989f87f6c3ddcf05240aeeeb737 run #0: crashed: WARNING in untrack_pfn run #1: crashed: WARNING in untrack_pfn 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 corrupted revisions tested: 2, total time: 28m47.655791418s (build: 17m53.728009324s, test: 9m32.283565228s) the crash still happens on HEAD commit msg: Linux 4.19.109 crash: WARNING in corrupted RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f887ba626d4 R13: 00000000004bfce6 R14: 00000000004d1a38 R15: 0000000000000004 CPU: 0 PID: 8205 Comm: syz-executor.2 Not tainted 4.19.109-syzkaller #0 WARNING: CPU: 1 PID: 8191 at arch/x86/mm/pat.c:1064 untrack_pfn+0x1cb/0x240 arch/x86/mm/pat.c:1073 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Kernel panic - not syncing: panic_on_warn set ... 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 vm_area_dup+0x1b/0x150 kernel/fork.c:329 dup_mmap kernel/fork.c:489 [inline] dup_mm kernel/fork.c:1288 [inline] copy_mm kernel/fork.c:1344 [inline] copy_process.part.34+0x3152/0x7390 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:00007ff75b4bbc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000038 RAX: ffffffffffffffda RBX: 00007ff75b4bbc90 RCX: 0000000000459829 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007ff75b4bc6d4 R13: 00000000004bfce6 R14: 00000000004d1a38 R15: 0000000000000004 CPU: 1 PID: 8191 Comm: syz-executor.0 Not tainted 4.19.109-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 FAULT_INJECTION: forcing a failure. name failslab, interval 1, probability 0, space 0, times 0 do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:316 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:1037 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 bc a4 0d 00 48 89 95 30 ff ff ff 48 89 b5 38 ff ff RSP: 0018:ffff88808013f8b8 EFLAGS: 00010282 RAX: 00000000ffffffea RBX: 1ffff11010027f19 RCX: 0000000000000000 RDX: 0000000000000004 RSI: 0000000000000004 RDI: ffffffff89c886a0 RBP: ffff88808013f988 R08: ffffed1014c4b090 R09: ffffed1014c4b08f R10: ffffed1014c4b08f R11: ffff8880a625847b R12: ffff8880928b9040 R13: 0000000000000000 R14: ffff88808013f968 R15: ffff88808013fa58 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/0x7390 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:00007f887ba61c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000038 RAX: ffffffffffffffda RBX: 00007f887ba61c90 RCX: 0000000000459829 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f887ba626d4 R13: 00000000004bfce6 R14: 00000000004d1a38 R15: 0000000000000004 CPU: 0 PID: 8208 Comm: syz-executor.3 Not tainted 4.19.109-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 vm_area_dup+0x1b/0x150 kernel/fork.c:329 dup_mmap kernel/fork.c:489 [inline] dup_mm kernel/fork.c:1288 [inline] copy_mm kernel/fork.c:1344 [inline] copy_process.part.34+0x3152/0x7390 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:00007fb28ccd1c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000038 RAX: ffffffffffffffda RBX: 00007fb28ccd1c90 RCX: 0000000000459829 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fb28ccd26d4 R13: 00000000004bfce6 R14: 00000000004d1a38 R15: 0000000000000004 Kernel Offset: disabled Rebooting in 86400 seconds..