Hello, syzbot found the following issue on: HEAD commit: 6b1f86f8e9c7 Merge tag 'folio-5.18b' of git://git.infradea.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1330b513700000 kernel config: https://syzkaller.appspot.com/x/.config?x=b99d35252f93aed2 dashboard link: https://syzkaller.appspot.com/bug?extid=f8c45ccc7d5d45fc5965 compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=142a1f25700000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1618e40b700000 The issue was bisected to: commit 5abc1e37afa0335c52608d640fd30910b2eeda21 Author: Muchun Song <songmuchun@xxxxxxxxxxxxx> Date: Tue Mar 22 21:41:19 2022 +0000 mm: list_lru: allocate list_lru_one only when needed bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=13ea4c71700000 final oops: https://syzkaller.appspot.com/x/report.txt?x=101a4c71700000 console output: https://syzkaller.appspot.com/x/log.txt?x=17ea4c71700000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+f8c45ccc7d5d45fc5965@xxxxxxxxxxxxxxxxxxxxxxxxx Fixes: 5abc1e37afa0 ("mm: list_lru: allocate list_lru_one only when needed") general protection fault, probably for non-canonical address 0xdffffc0000000001: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f] CPU: 0 PID: 2964 Comm: udevd Tainted: G W 5.17.0-syzkaller-02172-g6b1f86f8e9c7 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:list_add_tail include/linux/list.h:102 [inline] RIP: 0010:list_lru_add+0x277/0x510 mm/list_lru.c:129 Code: 04 64 4d 8d 7c c7 10 4c 89 3c 24 e8 c3 f6 ca ff 49 8d 47 08 48 89 c2 48 89 44 24 10 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 <80> 3c 02 00 0f 85 4d 02 00 00 4d 8b 77 08 48 89 df 48 8b 14 24 4c RSP: 0018:ffffc90002c17db0 EFLAGS: 00010202 RAX: dffffc0000000000 RBX: ffff88823bc54fc0 RCX: 0000000000000000 RDX: 0000000000000001 RSI: ffffffff81acf7ad RDI: ffffffff8d93ddd0 RBP: ffff8880256da7f0 R08: 0000000000000000 R09: ffffffff8d93ddd7 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000001 R13: ffff88807fb2a880 R14: 0000000000000080 R15: 0000000000000000 FS: 00007f711b82e840(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f565fc7a718 CR3: 000000001a735000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> d_lru_add fs/dcache.c:431 [inline] retain_dentry fs/dcache.c:685 [inline] dput+0x7a7/0xdb0 fs/dcache.c:908 __fput+0x3ab/0x9f0 fs/file_table.c:330 task_work_run+0xdd/0x1a0 kernel/task_work.c:164 tracehook_notify_resume include/linux/tracehook.h:188 [inline] exit_to_user_mode_loop kernel/entry/common.c:190 [inline] exit_to_user_mode_prepare+0x27e/0x290 kernel/entry/common.c:222 __syscall_exit_to_user_mode_work kernel/entry/common.c:304 [inline] syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:315 do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f711b92a467 Code: 44 00 00 48 8b 15 11 aa 0c 00 f7 d8 64 89 02 b8 ff ff ff ff eb bc 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 b8 03 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 8b 15 e1 a9 0c 00 f7 d8 64 89 02 b8 RSP: 002b:00007ffe9fd16aa8 EFLAGS: 00000202 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 000055991078b240 RCX: 00007f711b92a467 RDX: 00007f711b9f1780 RSI: 0000000000000000 RDI: 000000000000000c RBP: 0000000000000000 R08: 0000000000000000 R09: 00007f711b9f5a60 R10: 0000000000000200 R11: 0000000000000202 R12: 00007f711b9f2380 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:list_add_tail include/linux/list.h:102 [inline] RIP: 0010:list_lru_add+0x277/0x510 mm/list_lru.c:129 Code: 04 64 4d 8d 7c c7 10 4c 89 3c 24 e8 c3 f6 ca ff 49 8d 47 08 48 89 c2 48 89 44 24 10 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 <80> 3c 02 00 0f 85 4d 02 00 00 4d 8b 77 08 48 89 df 48 8b 14 24 4c RSP: 0018:ffffc90002c17db0 EFLAGS: 00010202 RAX: dffffc0000000000 RBX: ffff88823bc54fc0 RCX: 0000000000000000 RDX: 0000000000000001 RSI: ffffffff81acf7ad RDI: ffffffff8d93ddd0 RBP: ffff8880256da7f0 R08: 0000000000000000 R09: ffffffff8d93ddd7 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000001 R13: ffff88807fb2a880 R14: 0000000000000080 R15: 0000000000000000 FS: 00007f711b82e840(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f565fc7a718 CR3: 000000001a735000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 04 64 add $0x64,%al 2: 4d 8d 7c c7 10 lea 0x10(%r15,%rax,8),%r15 7: 4c 89 3c 24 mov %r15,(%rsp) b: e8 c3 f6 ca ff callq 0xffcaf6d3 10: 49 8d 47 08 lea 0x8(%r15),%rax 14: 48 89 c2 mov %rax,%rdx 17: 48 89 44 24 10 mov %rax,0x10(%rsp) 1c: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 23: fc ff df 26: 48 c1 ea 03 shr $0x3,%rdx * 2a: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) <-- trapping instruction 2e: 0f 85 4d 02 00 00 jne 0x281 34: 4d 8b 77 08 mov 0x8(%r15),%r14 38: 48 89 df mov %rbx,%rdi 3b: 48 8b 14 24 mov (%rsp),%rdx 3f: 4c rex.WR --- 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. For information about bisection process see: https://goo.gl/tpsmEJ#bisection syzbot can test patches for this issue, for details see: https://goo.gl/tpsmEJ#testing-patches
