bisecting fixing commit since 893af1c79e42e53af0da22165b46eea135af0613 building syzkaller on acb51638141ff960f547431757130749bc176bc0 testing commit 893af1c79e42e53af0da22165b46eea135af0613 with gcc (GCC) 8.1.0 kernel signature: 674076fff8700b9d33d26806ab224db08e82678e59fecf861304d2de29c26cdd run #0: crashed: WARNING in unmap_single_vma 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 testing current HEAD 0c88e405c97ed1828443b67891e6d4bb6e56cd4e testing commit 0c88e405c97ed1828443b67891e6d4bb6e56cd4e with gcc (GCC) 8.1.0 kernel signature: 31c41d7f74b8cfe162cca3f7b647ad5627b87af4701a75e35dbc7c07f7431198 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 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: 24m6.986592502s (build: 17m21.788139241s, test: 5m39.0286353s) the crash still happens on HEAD commit msg: Linux 4.19.160 crash: WARNING in unmap_single_vma 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:1588 slab_pre_alloc_hook mm/slab.h:424 [inline] slab_alloc mm/slab.c:3383 [inline] kmem_cache_alloc+0x47/0x730 mm/slab.c:3557 anon_vma_chain_alloc mm/rmap.c:129 [inline] anon_vma_clone+0xc3/0x3f0 mm/rmap.c:269 WARNING: CPU: 0 PID: 7458 at arch/x86/mm/pat.c:1064 untrack_pfn+0x1cb/0x240 arch/x86/mm/pat.c:1073 anon_vma_fork+0x80/0x450 mm/rmap.c:332 Kernel panic - not syncing: panic_on_warn set ... dup_mmap kernel/fork.c:504 [inline] dup_mm kernel/fork.c:1288 [inline] copy_mm kernel/fork.c:1344 [inline] copy_process.part.34+0x346b/0x7690 kernel/fork.c:1916 copy_process kernel/fork.c:1722 [inline] _do_fork+0x16a/0xcb0 kernel/fork.c:2228 __do_sys_clone kernel/fork.c:2335 [inline] __se_sys_clone kernel/fork.c:2329 [inline] __x64_sys_clone+0xba/0x140 kernel/fork.c:2329 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4598a9 Code: 7d 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 4b b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f3aac7e0c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000038 RAX: ffffffffffffffda RBX: 00007f3aac7e0c90 RCX: 00000000004598a9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 000000000075bfc8 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f3aac7e16d4 R13: 00000000004bfd66 R14: 00000000004d1ab8 R15: 0000000000000004 CPU: 0 PID: 7458 Comm: syz-executor.4 Not tainted 4.19.160-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 8c a5 0d 00 48 89 95 30 ff ff ff 48 89 b5 38 ff ff RSP: 0018:ffff8880a27178c0 EFLAGS: 00010282 RAX: 00000000ffffffea RBX: 1ffff110144e2f1a RCX: 0000000000000000 RDX: 0000000000000004 RSI: 0000000000000004 RDI: ffffffff89c8b6a0 RBP: ffff8880a2717990 R08: ffffed1013a8a838 R09: ffffed1013a8a837 R10: ffffed1013a8a837 R11: ffff88809d4541bb R12: ffff8880b56c4e70 R13: 0000000000000000 R14: ffff8880a2717970 R15: ffff8880a2717a60 unmap_single_vma+0x144/0x300 mm/memory.c:1547 unmap_vmas+0xe7/0x1a0 mm/memory.c:1598 exit_mmap+0x251/0x470 mm/mmap.c:3093 __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+0x2c97/0x7690 kernel/fork.c:1916 copy_process kernel/fork.c:1722 [inline] _do_fork+0x16a/0xcb0 kernel/fork.c:2228 __do_sys_clone kernel/fork.c:2335 [inline] __se_sys_clone kernel/fork.c:2329 [inline] __x64_sys_clone+0xba/0x140 kernel/fork.c:2329 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4598a9 Code: 7d 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 4b b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f82a4deac78 EFLAGS: 00000246 ORIG_RAX: 0000000000000038 RAX: ffffffffffffffda RBX: 00007f82a4deac90 RCX: 00000000004598a9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f82a4deb6d4 R13: 00000000004bfd66 R14: 00000000004d1ab8 R15: 0000000000000004 CPU: 1 PID: 7462 Comm: syz-executor.2 Not tainted 4.19.160-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:1588 slab_pre_alloc_hook mm/slab.h:424 [inline] slab_alloc mm/slab.c:3383 [inline] kmem_cache_alloc_trace+0x2d4/0x740 mm/slab.c:3623 kmalloc include/linux/slab.h:515 [inline] kzalloc include/linux/slab.h:709 [inline] reserve_memtype+0x166/0x710 arch/x86/mm/pat.c:595 reserve_pfn_range+0x12b/0x350 arch/x86/mm/pat.c:912 track_pfn_copy+0x173/0x1b0 arch/x86/mm/pat.c:981 copy_page_range+0xefa/0x1810 mm/memory.c:1258 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+0x39b7/0x7690 kernel/fork.c:1916 copy_process kernel/fork.c:1722 [inline] _do_fork+0x16a/0xcb0 kernel/fork.c:2228 __do_sys_clone kernel/fork.c:2335 [inline] __se_sys_clone kernel/fork.c:2329 [inline] __x64_sys_clone+0xba/0x140 kernel/fork.c:2329 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4598a9 Code: 7d 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 4b b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fa91edeac78 EFLAGS: 00000246 ORIG_RAX: 0000000000000038 RAX: ffffffffffffffda RBX: 00007fa91edeac90 RCX: 00000000004598a9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fa91edeb6d4 R13: 00000000004bfd66 R14: 00000000004d1ab8 R15: 0000000000000004 Kernel Offset: disabled Rebooting in 86400 seconds..