Hello, syzbot found the following issue on: HEAD commit: 123212f53f3e Add linux-next specific files for 20230707 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=12cd9964a80000 kernel config: https://syzkaller.appspot.com/x/.config?x=15ec80b62f588543 dashboard link: https://syzkaller.appspot.com/bug?extid=05a4b28d3ba52e73b4c6 compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/098f7ee2237c/disk-123212f5.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/88defebbfc49/vmlinux-123212f5.xz kernel image: https://storage.googleapis.com/syzbot-assets/d5e9343ec16a/bzImage-123212f5.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+05a4b28d3ba52e73b4c6@xxxxxxxxxxxxxxxxxxxxxxxxx general protection fault, probably for non-canonical address 0xffdffc001fc10009: 0000 [#1] PREEMPT SMP KASAN KASAN: maybe wild-memory-access in range [0xff000000fe080048-0xff000000fe08004f] CPU: 0 PID: 17492 Comm: syz-executor.4 Not tainted 6.4.0-next-20230707-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/03/2023 RIP: 0010:filemap_release_folio+0x1e6/0x2a0 mm/filemap.c:4082 Code: 48 c1 ea 03 80 3c 02 00 0f 85 ac 00 00 00 48 8b 9b e8 01 00 00 48 b8 00 00 00 00 00 fc ff df 48 8d 7b 48 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 90 00 00 00 48 8b 5b 48 48 85 db 74 23 e8 a2 dd RSP: 0018:ffffc900053f71b8 EFLAGS: 00010a06 RAX: dffffc0000000000 RBX: ff000000fe080001 RCX: ffffc9000c36a000 RDX: 1fe000001fc10009 RSI: ffffffff81b10a98 RDI: ff000000fe080049 RBP: ffffea0000c5af00 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000000 R13: 0000000000000cc0 R14: 0000000000000000 R15: ffff88807d7950d1 FS: 00007f39a8bfa700(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f39a8c19698 CR3: 0000000026575000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> shrink_folio_list+0x291e/0x3e60 mm/vmscan.c:2068 reclaim_folio_list+0xd0/0x390 mm/vmscan.c:2801 reclaim_pages+0x442/0x670 mm/vmscan.c:2837 madvise_cold_or_pageout_pte_range+0x100e/0x1ee0 mm/madvise.c:533 walk_pmd_range mm/pagewalk.c:140 [inline] walk_pud_range mm/pagewalk.c:218 [inline] walk_p4d_range mm/pagewalk.c:253 [inline] walk_pgd_range+0x9e7/0x1470 mm/pagewalk.c:290 __walk_page_range+0x651/0x780 mm/pagewalk.c:392 walk_page_range+0x311/0x4a0 mm/pagewalk.c:490 madvise_pageout_page_range mm/madvise.c:591 [inline] madvise_pageout+0x2fe/0x560 mm/madvise.c:618 madvise_vma_behavior+0x61a/0x21a0 mm/madvise.c:1039 madvise_walk_vmas+0x1c7/0x2b0 mm/madvise.c:1268 do_madvise.part.0+0x276/0x490 mm/madvise.c:1448 do_madvise mm/madvise.c:1461 [inline] __do_sys_madvise mm/madvise.c:1461 [inline] __se_sys_madvise mm/madvise.c:1459 [inline] __x64_sys_madvise+0x117/0x150 mm/madvise.c:1459 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f39a7e8c389 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 00 00 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 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f39a8bfa168 EFLAGS: 00000246 ORIG_RAX: 000000000000001c RAX: ffffffffffffffda RBX: 00007f39a7fac050 RCX: 00007f39a7e8c389 RDX: 0000000000000015 RSI: 0000000000600003 RDI: 0000000020000000 RBP: 00007f39a7ed7493 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffe1ce83f1f R14: 00007f39a8bfa300 R15: 0000000000022000 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:filemap_release_folio+0x1e6/0x2a0 mm/filemap.c:4082 Code: 48 c1 ea 03 80 3c 02 00 0f 85 ac 00 00 00 48 8b 9b e8 01 00 00 48 b8 00 00 00 00 00 fc ff df 48 8d 7b 48 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 90 00 00 00 48 8b 5b 48 48 85 db 74 23 e8 a2 dd RSP: 0018:ffffc900053f71b8 EFLAGS: 00010a06 RAX: dffffc0000000000 RBX: ff000000fe080001 RCX: ffffc9000c36a000 RDX: 1fe000001fc10009 RSI: ffffffff81b10a98 RDI: ff000000fe080049 RBP: ffffea0000c5af00 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000000 R13: 0000000000000cc0 R14: 0000000000000000 R15: ffff88807d7950d1 FS: 00007f39a8bfa700(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f3c3a1831b8 CR3: 0000000026575000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 48 c1 ea 03 shr $0x3,%rdx 4: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) 8: 0f 85 ac 00 00 00 jne 0xba e: 48 8b 9b e8 01 00 00 mov 0x1e8(%rbx),%rbx 15: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 1c: fc ff df 1f: 48 8d 7b 48 lea 0x48(%rbx),%rdi 23: 48 89 fa mov %rdi,%rdx 26: 48 c1 ea 03 shr $0x3,%rdx * 2a: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) <-- trapping instruction 2e: 0f 85 90 00 00 00 jne 0xc4 34: 48 8b 5b 48 mov 0x48(%rbx),%rbx 38: 48 85 db test %rbx,%rbx 3b: 74 23 je 0x60 3d: e8 .byte 0xe8 3e: a2 .byte 0xa2 3f: dd .byte 0xdd --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the bug is already fixed, let syzbot know by replying with: #syz fix: exact-commit-title If you want to change bug's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the bug is a duplicate of another bug, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup
