VFS: Found a V7 FS (block size = 512) on device loop4 ------------[ cut here ]------------ WARNING: CPU: 0 PID: 8342 at fs/inode.c:343 inc_nlink.cold+0x11/0x18 fs/inode.c:343 Kernel panic - not syncing: panic_on_warn set ... CPU: 0 PID: 8342 Comm: syz-executor.4 Not tainted 4.19.190-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1fc/0x2ef lib/dump_stack.c:118 panic+0x26a/0x50e kernel/panic.c:186 __warn.cold+0x20/0x5a kernel/panic.c:541 report_bug+0x262/0x2b0 lib/bug.c:186 fixup_bug arch/x86/kernel/traps.c:178 [inline] fixup_bug arch/x86/kernel/traps.c:173 [inline] do_error_trap+0x1d7/0x310 arch/x86/kernel/traps.c:296 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:1038 RIP: 0010:inc_nlink.cold+0x11/0x18 fs/inode.c:343 Code: c0 74 04 3c 03 7e 08 8b 5d 48 e9 06 77 b5 f9 4c 89 e7 e8 d9 a9 a4 f9 eb ee e8 d2 e6 6e f9 48 c7 c7 c0 aa 74 88 e8 eb ee fe ff <0f> 0b e9 48 78 b5 f9 e8 ba e6 6e f9 48 8d 7b 40 b8 ff ff 37 00 48 RSP: 0018:ffff88803b397df0 EFLAGS: 00010282 RAX: 0000000000000024 RBX: ffff8880493cd660 RCX: 0000000000000000 RDX: 000000000000826e RSI: ffffffff814dde61 RDI: ffffed1007672fb0 RBP: 0000000000000000 R08: 0000000000000024 R09: 0000000000000000 R10: 0000000000000005 R11: 0000000000000000 R12: ffff8880493cd6a8 R13: ffff88808de3c000 R14: 000000000000007e R15: 0000000000000040 inode_inc_link_count include/linux/fs.h:2101 [inline] sysv_mkdir+0x21/0x150 fs/sysv/namei.c:131 vfs_mkdir+0x508/0x7a0 fs/namei.c:3819 do_mkdirat+0x262/0x2d0 fs/namei.c:3842 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4665d9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f70edd5d188 EFLAGS: 00000246 ORIG_RAX: 0000000000000102 RAX: ffffffffffffffda RBX: 000000000056bf60 RCX: 00000000004665d9 RDX: 0000000000000040 RSI: 0000000020000440 RDI: 0000000000000005 RBP: 00000000004bfcb9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf60 R13: 00007ffd361ce54f R14: 00007f70edd5d300 R15: 0000000000022000 Kernel Offset: disabled Rebooting in 86400 seconds..