syzbot has found a reproducer for the following issue on: HEAD commit: 869a85b9 Add linux-next specific files for 20210507 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=15b48a63d00000 kernel config: https://syzkaller.appspot.com/x/.config?x=b72885037018d06d dashboard link: https://syzkaller.appspot.com/bug?extid=c48f34012b06c4ac67dd syz repro: https://syzkaller.appspot.com/x/repro.syz?x=10479fd5d00000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1565e995d00000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+c48f34012b06c4ac67dd@xxxxxxxxxxxxxxxxxxxxxxxxx ------------[ cut here ]------------ kernel BUG at include/linux/swapops.h:197! invalid opcode: 0000 [#1] PREEMPT SMP KASAN CPU: 0 PID: 8460 Comm: syz-executor246 Not tainted 5.12.0-next-20210507-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:migration_entry_to_page include/linux/swapops.h:197 [inline] RIP: 0010:migration_entry_to_page include/linux/swapops.h:190 [inline] RIP: 0010:zap_huge_pmd+0xe5b/0x1110 mm/huge_memory.c:1697 Code: 2b 3f b8 ff 48 8b 5c 24 10 48 83 eb 01 e9 a8 f6 ff ff e8 18 3f b8 ff 48 8b 5c 24 10 48 83 eb 01 e9 66 f7 ff ff e8 05 3f b8 ff <0f> 0b e8 fe 3e b8 ff 31 f6 31 ff 49 bc 00 f0 ff ff ff ff 0f 00 e8 RSP: 0018:ffffc90001a2f730 EFLAGS: 00010293 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: ffff888024bc5580 RSI: ffffffff81bc972b RDI: 0000000000000003 RBP: ffffc90001a2fa48 R08: 0000000000000000 R09: 0000000000000000 R10: ffffffff81bc8ec8 R11: 0000000000000000 R12: ffff88802c9a5800 R13: ffffea0000e58080 R14: ffff8880303bfea0 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000004c8168 CR3: 0000000016b36000 CR4: 00000000001506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: zap_pmd_range mm/memory.c:1361 [inline] zap_pud_range mm/memory.c:1403 [inline] zap_p4d_range mm/memory.c:1424 [inline] unmap_page_range+0x1aa4/0x2650 mm/memory.c:1445 unmap_single_vma+0x198/0x300 mm/memory.c:1490 unmap_vmas+0x16d/0x2f0 mm/memory.c:1522 exit_mmap+0x2a8/0x590 mm/mmap.c:3207 __mmput+0x122/0x470 kernel/fork.c:1096 mmput+0x58/0x60 kernel/fork.c:1117 exit_mm kernel/exit.c:502 [inline] do_exit+0xb0a/0x2a60 kernel/exit.c:813 do_group_exit+0x125/0x310 kernel/exit.c:923 get_signal+0x47f/0x2150 kernel/signal.c:2856 arch_do_signal_or_restart+0x2a8/0x1eb0 arch/x86/kernel/signal.c:789 handle_signal_work kernel/entry/common.c:147 [inline] exit_to_user_mode_loop kernel/entry/common.c:171 [inline] exit_to_user_mode_prepare+0x171/0x280 kernel/entry/common.c:208 __syscall_exit_to_user_mode_work kernel/entry/common.c:290 [inline] syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:301 do_syscall_64+0x47/0xb0 arch/x86/entry/common.c:57 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x4458f9 Code: Unable to access opcode bytes at RIP 0x4458cf. RSP: 002b:00007f45f24e4318 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 00000000004ca408 RCX: 00000000004458f9 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00000000004ca408 RBP: 00000000004ca400 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000001000000020 R13: 00007ffeb676771f R14: 00007f45f24e4400 R15: 0000000000022000 Modules linked in: ---[ end trace 8c9f5c48deec1bb7 ]--- RIP: 0010:migration_entry_to_page include/linux/swapops.h:197 [inline] RIP: 0010:migration_entry_to_page include/linux/swapops.h:190 [inline] RIP: 0010:zap_huge_pmd+0xe5b/0x1110 mm/huge_memory.c:1697 Code: 2b 3f b8 ff 48 8b 5c 24 10 48 83 eb 01 e9 a8 f6 ff ff e8 18 3f b8 ff 48 8b 5c 24 10 48 83 eb 01 e9 66 f7 ff ff e8 05 3f b8 ff <0f> 0b e8 fe 3e b8 ff 31 f6 31 ff 49 bc 00 f0 ff ff ff ff 0f 00 e8 RSP: 0018:ffffc90001a2f730 EFLAGS: 00010293 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: ffff888024bc5580 RSI: ffffffff81bc972b RDI: 0000000000000003 RBP: ffffc90001a2fa48 R08: 0000000000000000 R09: 0000000000000000 R10: ffffffff81bc8ec8 R11: 0000000000000000 R12: ffff88802c9a5800 R13: ffffea0000e58080 R14: ffff8880303bfea0 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000004c8168 CR3: 000000000bc8e000 CR4: 00000000001506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
