Hello, syzbot found the following issue on: HEAD commit: b7b275e60bcd Linux 6.1-rc7 git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=102c68d5880000 kernel config: https://syzkaller.appspot.com/x/.config?x=cc4b2e0a8e8a8366 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 userspace arch: i386 Unfortunately, I don't have any reproducer for this issue yet. IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+90392eaed540afcc8fc3@xxxxxxxxxxxxxxxxxxxxxxxxx REISERFS (device loop1): Created .reiserfs_priv - reserved for xattr storage. overlayfs: upper fs needs to support d_type. overlayfs: upper fs does not support tmpfile. BUG: unable to handle page fault for address: fffffffffff8161d #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page PGD c28f067 P4D c28f067 PUD c291067 PMD 0 Oops: 0000 [#1] PREEMPT SMP KASAN CPU: 1 PID: 5330 Comm: syz-executor.1 Not tainted 6.1.0-rc7-syzkaller #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014 RIP: 0010:__lock_acquire+0xd8d/0x56d0 kernel/locking/lockdep.c:4925 Code: c8 00 00 00 89 05 73 07 19 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 60 b5 d2 8f 0f 84 4c f3 ff ff 41 83 fc 01 0f 87 54 f3 ff RSP: 0018:ffffc9002212f7c8 EFLAGS: 00010046 RAX: dffffc0000000000 RBX: 1ffff92004425f29 RCX: 0000000000000000 RDX: 1fffffffffff02c3 RSI: 0000000000000000 RDI: 0000000000000001 RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000 R10: fffffbfff1ca3442 R11: 0000000000000000 R12: 0000000000000000 R13: ffff88801c779d40 R14: fffffffffff8161d R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff88802c700000(0063) knlGS:00000000f7f15b40 CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 CR2: fffffffffff8161d CR3: 000000001b613000 CR4: 0000000000150ee0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 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:1297 [inline] ovl_make_workdir fs/overlayfs/super.c:1419 [inline] ovl_get_workdir fs/overlayfs/super.c:1534 [inline] ovl_fill_super+0x1ddd/0x6400 fs/overlayfs/super.c:2090 mount_nodev+0x64/0x120 fs/super.c:1447 legacy_get_tree+0x109/0x220 fs/fs_context.c:610 vfs_get_tree+0x8d/0x2f0 fs/super.c:1531 do_new_mount fs/namespace.c:3040 [inline] path_mount+0x132a/0x1e20 fs/namespace.c:3370 do_mount fs/namespace.c:3383 [inline] __do_sys_mount fs/namespace.c:3591 [inline] __se_sys_mount fs/namespace.c:3568 [inline] __ia32_sys_mount+0x282/0x300 fs/namespace.c:3568 do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline] __do_fast_syscall_32+0x65/0xf0 arch/x86/entry/common.c:178 do_fast_syscall_32+0x33/0x70 arch/x86/entry/common.c:203 entry_SYSENTER_compat_after_hwframe+0x70/0x82 RIP: 0023:0xf7f1a549 Code: 03 74 c0 01 10 05 03 74 b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00 RSP: 002b:00000000f7f155cc EFLAGS: 00000296 ORIG_RAX: 0000000000000015 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000200000c0 RDX: 0000000020000080 RSI: 0000000000000000 RDI: 0000000020000480 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000296 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 </TASK> Modules linked in: CR2: fffffffffff8161d ---[ end trace 0000000000000000 ]--- RIP: 0010:__lock_acquire+0xd8d/0x56d0 kernel/locking/lockdep.c:4925 Code: c8 00 00 00 89 05 73 07 19 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 60 b5 d2 8f 0f 84 4c f3 ff ff 41 83 fc 01 0f 87 54 f3 ff RSP: 0018:ffffc9002212f7c8 EFLAGS: 00010046 RAX: dffffc0000000000 RBX: 1ffff92004425f29 RCX: 0000000000000000 RDX: 1fffffffffff02c3 RSI: 0000000000000000 RDI: 0000000000000001 RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000 R10: fffffbfff1ca3442 R11: 0000000000000000 R12: 0000000000000000 R13: ffff88801c779d40 R14: fffffffffff8161d R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff88802c700000(0063) knlGS:00000000f7f15b40 CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 CR2: fffffffffff8161d CR3: 000000001b613000 CR4: 0000000000150ee0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: c8 00 00 00 enterq $0x0,$0x0 4: 89 05 73 07 19 0f mov %eax,0xf190773(%rip) # 0xf19077d 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 60 b5 d2 8f cmpq $0xffffffff8fd2b560,(%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) --- This report is generated by a bot. 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