syzbot has found a reproducer for the following issue on: HEAD commit: 8395ae05cb5a Merge tag 'scsi-misc' of git://git.kernel.org.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1310a5f8480000 kernel config: https://syzkaller.appspot.com/x/.config?x=85327a149d5f50f dashboard link: https://syzkaller.appspot.com/bug?extid=90392eaed540afcc8fc3 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=16199460480000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1797f274480000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/71f6a8070e91/disk-8395ae05.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/0f742b65488c/vmlinux-8395ae05.xz kernel image: https://storage.googleapis.com/syzbot-assets/6e5588eaf267/bzImage-8395ae05.xz mounted in repro: https://storage.googleapis.com/syzbot-assets/4673a4f9cbbb/mount_0.gz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+90392eaed540afcc8fc3@xxxxxxxxxxxxxxxxxxxxxxxxx BUG: unable to handle page fault for address: fffffffffff81629 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page PGD c48f067 P4D c48f067 PUD c491067 PMD 0 Oops: 0000 [#1] PREEMPT SMP KASAN CPU: 0 PID: 5251 Comm: syz-executor130 Not tainted 6.1.0-syzkaller-14446-g8395ae05cb5a #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 RIP: 0010:__lock_acquire+0xd8d/0x56d0 kernel/locking/lockdep.c:4925 Code: c8 00 00 00 89 05 83 4e 3c 0f e9 bd 00 00 00 48 b8 00 00 00 00 00 fc ff df 4c 89 f2 48 c1 ea 03 80 3c 02 00 0f 85 4e 31 00 00 <49> 81 3e e0 e5 f6 8f 0f 84 4c f3 ff ff 41 83 fc 01 0f 87 54 f3 ff RSP: 0018:ffffc90004e0f7e8 EFLAGS: 00010046 RAX: dffffc0000000000 RBX: 1ffff920009c1f2d RCX: 0000000000000000 RDX: 1fffffffffff02c5 RSI: 0000000000000000 RDI: 0000000000000001 RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000 R10: fffffbfff1ce5ada R11: 0000000000000000 R12: 0000000000000000 R13: ffff88802c3a1d40 R14: fffffffffff81629 R15: 0000000000000000 FS: 00007fab0371d700(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: fffffffffff81629 CR3: 000000006e8d9000 CR4: 0000000000350ef0 Call Trace: <TASK> lock_acquire kernel/locking/lockdep.c:5668 [inline] lock_acquire+0x1e3/0x630 kernel/locking/lockdep.c:5633 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline] _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154 spin_lock include/linux/spinlock.h:350 [inline] take_dentry_name_snapshot+0x2b/0x170 fs/dcache.c:315 ovl_check_rename_whiteout fs/overlayfs/super.c:1207 [inline] ovl_make_workdir fs/overlayfs/super.c:1329 [inline] ovl_get_workdir fs/overlayfs/super.c:1444 [inline] ovl_fill_super+0x1dd2/0x6330 fs/overlayfs/super.c:2000 mount_nodev+0x64/0x120 fs/super.c:1405 legacy_get_tree+0x109/0x220 fs/fs_context.c:610 vfs_get_tree+0x8d/0x2f0 fs/super.c:1489 do_new_mount fs/namespace.c:3145 [inline] path_mount+0x132a/0x1e20 fs/namespace.c:3475 do_mount fs/namespace.c:3488 [inline] __do_sys_mount fs/namespace.c:3697 [inline] __se_sys_mount fs/namespace.c:3674 [inline] __x64_sys_mount+0x283/0x300 fs/namespace.c:3674 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: 0033:0x7fab03f80209 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 31 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:00007fab0371d208 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007fab04005528 RCX: 00007fab03f80209 RDX: 0000000020000080 RSI: 00000000200000c0 RDI: 0000000000000000 RBP: 00007fab04005520 R08: 0000000020000480 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fab0400552c R13: 00007ffcd399fc6f R14: 00007fab0371d300 R15: 0000000000022000 </TASK> Modules linked in: CR2: fffffffffff81629 ---[ end trace 0000000000000000 ]--- RIP: 0010:__lock_acquire+0xd8d/0x56d0 kernel/locking/lockdep.c:4925 Code: c8 00 00 00 89 05 83 4e 3c 0f e9 bd 00 00 00 48 b8 00 00 00 00 00 fc ff df 4c 89 f2 48 c1 ea 03 80 3c 02 00 0f 85 4e 31 00 00 <49> 81 3e e0 e5 f6 8f 0f 84 4c f3 ff ff 41 83 fc 01 0f 87 54 f3 ff RSP: 0018:ffffc90004e0f7e8 EFLAGS: 00010046 RAX: dffffc0000000000 RBX: 1ffff920009c1f2d RCX: 0000000000000000 RDX: 1fffffffffff02c5 RSI: 0000000000000000 RDI: 0000000000000001 RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000 R10: fffffbfff1ce5ada R11: 0000000000000000 R12: 0000000000000000 R13: ffff88802c3a1d40 R14: fffffffffff81629 R15: 0000000000000000 FS: 00007fab0371d700(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: fffffffffff81629 CR3: 000000006e8d9000 CR4: 0000000000350ef0 ---------------- Code disassembly (best guess): 0: c8 00 00 00 enterq $0x0,$0x0 4: 89 05 83 4e 3c 0f mov %eax,0xf3c4e83(%rip) # 0xf3c4e8d a: e9 bd 00 00 00 jmpq 0xcc f: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 16: fc ff df 19: 4c 89 f2 mov %r14,%rdx 1c: 48 c1 ea 03 shr $0x3,%rdx 20: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) 24: 0f 85 4e 31 00 00 jne 0x3178 * 2a: 49 81 3e e0 e5 f6 8f cmpq $0xffffffff8ff6e5e0,(%r14) <-- trapping instruction 31: 0f 84 4c f3 ff ff je 0xfffff383 37: 41 83 fc 01 cmp $0x1,%r12d 3b: 0f .byte 0xf 3c: 87 54 f3 ff xchg %edx,-0x1(%rbx,%rsi,8)
