Hello, syzbot found the following issue on: HEAD commit: 4fe89d07dcc2 Linux 6.0 git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=13ce7332880000 kernel config: https://syzkaller.appspot.com/x/.config?x=48b99eaecc2b324f dashboard link: https://syzkaller.appspot.com/bug?extid=b9bd2bf91ab68a2ab30c compiler: Debian clang version 13.0.1-++20220126092033+75e33f71c2da-1~exp1~20220126212112.63, 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/ce1d9b74a5e0/disk-4fe89d07.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/06e7c02fa7ba/vmlinux-4fe89d07.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+b9bd2bf91ab68a2ab30c@xxxxxxxxxxxxxxxxxxxxxxxxx ================================== WARNING: Nested lock was not taken 6.0.0-syzkaller #0 Not tainted ---------------------------------- syz-executor.3/23677 is trying to lock: ffff88803d162070 (&sb->s_type->i_lock_key#36){+.+.}-{2:2}, at: spin_lock include/linux/spinlock.h:349 [inline] ffff88803d162070 (&sb->s_type->i_lock_key#36){+.+.}-{2:2}, at: _atomic_dec_and_lock+0x9d/0x110 lib/dec_and_lock.c:28 but this task is not holding: general protection fault, probably for non-canonical address 0xdffffc0000000003: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000018-0x000000000000001f] CPU: 0 PID: 23677 Comm: syz-executor.3 Not tainted 6.0.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022 RIP: 0010:print_lock_nested_lock_not_held kernel/locking/lockdep.c:4885 [inline] RIP: 0010:__lock_acquire+0x1112/0x1f60 kernel/locking/lockdep.c:5044 Code: 3c 30 00 48 8b 5c 24 70 74 12 48 89 df e8 76 b5 72 00 49 be 00 00 00 00 00 fc ff df 48 8b 1b 48 83 c3 18 48 89 d8 48 c1 e8 03 <42> 80 3c 30 00 74 08 48 89 df e8 4f b5 72 00 48 8b 33 45 31 f6 48 RSP: 0000:ffffc900150af828 EFLAGS: 00010006 RAX: 0000000000000003 RBX: 0000000000000018 RCX: e0bee71cabdf0c00 RDX: ffffc90004761000 RSI: 00000000000170e6 RDI: 00000000000170e7 RBP: ffff88807be705e0 R08: ffffffff816bd38d R09: ffffed1017344f14 R10: ffffed1017344f14 R11: 1ffff11017344f13 R12: ffff88807be70848 R13: 08bc104c6bc4a8e0 R14: dffffc0000000000 R15: ffff88807be70000 FS: 00007f83fbf0f700(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f83fb3b0000 CR3: 000000001cc6f000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> lock_acquire+0x182/0x3c0 kernel/locking/lockdep.c:5666 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline] _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:154 spin_lock include/linux/spinlock.h:349 [inline] _atomic_dec_and_lock+0x9d/0x110 lib/dec_and_lock.c:28 iput+0x85/0x760 fs/inode.c:1766 ntfs_fill_super+0x3af3/0x42a0 fs/ntfs3/super.c:1190 get_tree_bdev+0x400/0x620 fs/super.c:1323 vfs_get_tree+0x88/0x270 fs/super.c:1530 do_new_mount+0x289/0xad0 fs/namespace.c:3040 do_mount fs/namespace.c:3383 [inline] __do_sys_mount fs/namespace.c:3591 [inline] __se_sys_mount+0x2d3/0x3c0 fs/namespace.c:3568 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f83fae8bada Code: 48 c7 c2 b8 ff ff ff f7 d8 64 89 02 b8 ff ff ff ff eb d2 e8 b8 04 00 00 0f 1f 84 00 00 00 00 00 49 89 ca b8 a5 00 00 00 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:00007f83fbf0ef88 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 0000000020000200 RCX: 00007f83fae8bada RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007f83fbf0efe0 RBP: 00007f83fbf0f020 R08: 00007f83fbf0f020 R09: 0000000020000000 R10: 0000000000000000 R11: 0000000000000202 R12: 0000000020000000 R13: 0000000020000100 R14: 00007f83fbf0efe0 R15: 0000000020002180 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:print_lock_nested_lock_not_held kernel/locking/lockdep.c:4885 [inline] RIP: 0010:__lock_acquire+0x1112/0x1f60 kernel/locking/lockdep.c:5044 Code: 3c 30 00 48 8b 5c 24 70 74 12 48 89 df e8 76 b5 72 00 49 be 00 00 00 00 00 fc ff df 48 8b 1b 48 83 c3 18 48 89 d8 48 c1 e8 03 <42> 80 3c 30 00 74 08 48 89 df e8 4f b5 72 00 48 8b 33 45 31 f6 48 RSP: 0000:ffffc900150af828 EFLAGS: 00010006 RAX: 0000000000000003 RBX: 0000000000000018 RCX: e0bee71cabdf0c00 RDX: ffffc90004761000 RSI: 00000000000170e6 RDI: 00000000000170e7 RBP: ffff88807be705e0 R08: ffffffff816bd38d R09: ffffed1017344f14 R10: ffffed1017344f14 R11: 1ffff11017344f13 R12: ffff88807be70848 R13: 08bc104c6bc4a8e0 R14: dffffc0000000000 R15: ffff88807be70000 FS: 00007f83fbf0f700(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f83fb3b0000 CR3: 000000001cc6f000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 3c 30 cmp $0x30,%al 2: 00 48 8b add %cl,-0x75(%rax) 5: 5c pop %rsp 6: 24 70 and $0x70,%al 8: 74 12 je 0x1c a: 48 89 df mov %rbx,%rdi d: e8 76 b5 72 00 callq 0x72b588 12: 49 be 00 00 00 00 00 movabs $0xdffffc0000000000,%r14 19: fc ff df 1c: 48 8b 1b mov (%rbx),%rbx 1f: 48 83 c3 18 add $0x18,%rbx 23: 48 89 d8 mov %rbx,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 42 80 3c 30 00 cmpb $0x0,(%rax,%r14,1) <-- trapping instruction 2f: 74 08 je 0x39 31: 48 89 df mov %rbx,%rdi 34: e8 4f b5 72 00 callq 0x72b588 39: 48 8b 33 mov (%rbx),%rsi 3c: 45 31 f6 xor %r14d,%r14d 3f: 48 rex.W --- 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.
