| Summary: | fs/unionfs: VOP_UNSET_TEXT without VOP_SET_TEXT leads to panic | ||
|---|---|---|---|
| Product: | Base System | Reporter: | Michael Zhilin <mizhka> |
| Component: | kern | Assignee: | freebsd-fs (Nobody) <fs> |
| Status: | New --- | ||
| Severity: | Affects Only Me | Keywords: | panic |
| Priority: | --- | ||
| Version: | CURRENT | ||
| Hardware: | amd64 | ||
| OS: | Any | ||
Hi, Here is kernel panic on unionfs. During removal of vm map, kernel tries to unset text of vnode without previous setting text of vnode. VNASSERT failed: error_ == 0 not true at /usr/src/sys/vm/vm_map.c:601 (vm_map_entry_set_vnode_text) 0xfffff8000844e988: type VREG usecount 1, writecount 0, refcount 2 seqc users 0 hold count flags () flags (VIRF_PGREAD) v_object 0xfffff80008401528 ref 4 pages 6 cleanbuf 0 dirtybuf 0 lock type tmpfs: SHARED (count 1) tag VT_TMPFS, tmpfs_node 0xfffff800084549a0, flags 0x0, links 1 mode 0555, owner 0, group 0, size 20912, status 0x0 panic: VOP_UNSET_TEXT returned 22 time = 1606214918 KDB: stack backtrace: db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xfffffe0015e718d0 vpanic() at vpanic+0x182/frame 0xfffffe0015e71920 panic() at panic+0x43/frame 0xfffffe0015e71980 vm_map_entry_set_vnode_text() at vm_map_entry_set_vnode_text+0x267/frame 0xfffffe0015e719c0 vm_map_process_deferred() at vm_map_process_deferred+0x9e/frame 0xfffffe0015e719e0 vm_map_remove() at vm_map_remove+0xc9/frame 0xfffffe0015e71a10 vmspace_exit() at vmspace_exit+0xa9/frame 0xfffffe0015e71a40 exit1() at exit1+0x542/frame 0xfffffe0015e71ab0 sys_sys_exit() at sys_sys_exit+0xd/frame 0xfffffe0015e71ac0 amd64_syscall() at amd64_syscall+0x12e/frame 0xfffffe0015e71bf0 fast_syscall_common() at fast_syscall_common+0xf8/frame 0xfffffe0015e71bf0 --- syscall (1, FreeBSD ELF64, sys_sys_exit), rip = 0x800387aca, rsp = 0x7fffffffe578, rbp = 0x7fffffffe590 --- KDB: enter: panic [ thread pid 680 tid 100071 ] Stopped at kdb_enter+0x37: movq $0,0x10adc26(%rip) Test case to reproduce it in vm-bhyve: vm create unionfstest vm iso https://download.freebsd.org/ftp/snapshots/ISO-IMAGES/13.0/FreeBSD-13.0-CURRENT-amd64-20201119-f2ea0734875-bootonly.iso vm install unionfstest FreeBSD-13.0-CURRENT-amd64-20201119-f2ea0734875-bootonly.iso vm console unionfstest Inside VM (plz choose live cd or shell): mkdir /tmp/var mount -t unionfs -o below /var /tmp/var cd /tmp/var cp /bin/date /tmp/var /tmp/var/date