BUG: Dentry 00000000f392c898{i=0,n=.index} still in use (1) [unmount of 9p 9p] ------------[ cut here ]------------ WARNING: CPU: 0 PID: 338 at fs/dcache.c:1597 umount_check+0x179/0x1c0 fs/dcache.c:1588 Kernel panic - not syncing: panic_on_warn set ... CPU: 0 PID: 338 Comm: syz-executor835 Not tainted 5.4.102-syzkaller-00363-g1bd00b1a96b5 #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+0x1d8/0x24e lib/dump_stack.c:118 panic+0x285/0x740 kernel/panic.c:221 __warn+0x1f1/0x200 kernel/panic.c:582 report_bug+0x380/0x4d0 lib/bug.c:195 fixup_bug arch/x86/kernel/traps.c:179 [inline] do_error_trap arch/x86/kernel/traps.c:272 [inline] do_invalid_op+0x6e/0x110 arch/x86/kernel/traps.c:291 invalid_op+0x1e/0x30 arch/x86/entry/entry_64.S:1029 RIP: 0010:umount_check+0x179/0x1c0 fs/dcache.c:1588 Code: ff 4c 8b 0b 48 81 c5 20 04 00 00 48 c7 c7 00 d5 e8 84 4c 89 fe 4c 89 f2 4c 89 f9 45 89 e8 31 c0 55 e8 e7 31 b0 ff 48 83 c4 08 <0f> 0b e9 fd fe ff ff 89 e9 80 e1 07 80 c1 03 38 c1 0f 8c d4 fe ff RSP: 0018:ffff8881e8e9f6f8 EFLAGS: 00010282 RAX: 000000000000004f RBX: ffffffff85fe5920 RCX: 687ddb4eb3e54e00 RDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000000000000000 RBP: ffff8881f14b0420 R08: ffffffff814e69c7 R09: ffffed103edc5e08 R10: ffffed103edc5e08 R11: 0000000000000000 R12: dffffc0000000000 R13: 0000000000000001 R14: 0000000000000000 R15: ffff8881efbc5bb0 d_walk+0x2d9/0x540 fs/dcache.c:1307 do_one_tree fs/dcache.c:1604 [inline] shrink_dcache_for_umount+0x8a/0x1a0 fs/dcache.c:1620 generic_shutdown_super+0x63/0x2a0 fs/super.c:447 kill_anon_super+0x36/0x60 fs/super.c:1108 v9fs_kill_super+0x48/0x90 fs/9p/vfs_super.c:219 deactivate_locked_super+0xaf/0x100 fs/super.c:335 deactivate_super+0x1b3/0x270 fs/super.c:366 cleanup_mnt+0x432/0x4e0 fs/namespace.c:1102 task_work_run+0x186/0x1b0 kernel/task_work.c:113 exit_task_work include/linux/task_work.h:22 [inline] do_exit+0xcb9/0x2bf0 kernel/exit.c:812 do_group_exit+0x15c/0x2c0 kernel/exit.c:910 get_signal+0x164f/0x1fc0 kernel/signal.c:2745 do_signal+0x92/0x5c0 arch/x86/kernel/signal.c:815 exit_to_usermode_loop arch/x86/entry/common.c:159 [inline] prepare_exit_to_usermode+0x207/0x310 arch/x86/entry/common.c:194 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x4458c9 Code: Bad RIP value. RSP: 002b:00007f7dc5f552f8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 00000000004cb4e0 RCX: 00000000004458c9 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00000000004cb4e8 RBP: 000000000049b120 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0030656c69662f2e R13: 6e656d6572636e69 R14: 64663d736e617274 R15: 00000000004cb4e8 Kernel Offset: disabled Rebooting in 86400 seconds..