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Fix panics when truncating/deleting files
There's an union in dbuf_dirty_record_t; dr_brtwrite could evaluate to B_TRUE if the dirty record is of another type than dl. Adding more explicit dr type check before trying to access dr_brtwrite. Fixes two similar panics: [ 1373.806119] VERIFY0(db->db_level) failed (0 == 1) [ 1373.807232] PANIC at dbuf.c:2549:dbuf_undirty() [ 1373.814979] dump_stack_lvl+0x71/0x90 [ 1373.815799] spl_panic+0xd3/0x100 [spl] [ 1373.827709] dbuf_undirty+0x62a/0x970 [zfs] [ 1373.829204] dmu_buf_will_dirty_impl+0x1e9/0x5b0 [zfs] [ 1373.831010] dnode_free_range+0x532/0x1220 [zfs] [ 1373.833922] dmu_free_long_range+0x4e0/0x930 [zfs] [ 1373.835277] zfs_trunc+0x75/0x1e0 [zfs] [ 1373.837958] zfs_freesp+0x9b/0x470 [zfs] [ 1373.847236] zfs_setattr+0x161a/0x3500 [zfs] [ 1373.855267] zpl_setattr+0x125/0x320 [zfs] [ 1373.856725] notify_change+0x1ee/0x4a0 [ 1373.859207] do_truncate+0x7f/0xd0 [ 1373.859968] do_sys_ftruncate+0x28e/0x2e0 [ 1373.860962] do_syscall_64+0x38/0x90 [ 1373.861751] entry_SYSCALL_64_after_hwframe+0x6e/0xd8 [ 1822.381337] VERIFY0(db->db_level) failed (0 == 1) [ 1822.382376] PANIC at dbuf.c:2549:dbuf_undirty() [ 1822.389232] dump_stack_lvl+0x71/0x90 [ 1822.389920] spl_panic+0xd3/0x100 [spl] [ 1822.399567] dbuf_undirty+0x62a/0x970 [zfs] [ 1822.400583] dmu_buf_will_dirty_impl+0x1e9/0x5b0 [zfs] [ 1822.401752] dnode_free_range+0x532/0x1220 [zfs] [ 1822.402841] dmu_object_free+0x74/0x120 [zfs] [ 1822.403869] zfs_znode_delete+0x75/0x120 [zfs] [ 1822.404906] zfs_rmnode+0x3f6/0x7f0 [zfs] [ 1822.405870] zfs_inactive+0xa3/0x610 [zfs] [ 1822.407803] zpl_evict_inode+0x3e/0x90 [zfs] [ 1822.408831] evict+0xc1/0x1c0 [ 1822.409387] do_unlinkat+0x147/0x300 [ 1822.410060] __x64_sys_unlinkat+0x33/0x60 [ 1822.410802] do_syscall_64+0x38/0x90 [ 1822.411458] entry_SYSCALL_64_after_hwframe+0x6e/0xd8 Reviewed-by: Alexander Motin <mav@FreeBSD.org> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Reviewed-by: Brian Atkinson <batkinson@lanl.gov> Signed-off-by: Pavel Snajdr <snajpa@snajpa.net> Closes #15983
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@ -2633,26 +2633,24 @@ dmu_buf_will_dirty_impl(dmu_buf_t *db_fake, int flags, dmu_tx_t *tx)
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ASSERT(!zfs_refcount_is_zero(&db->db_holds));
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/*
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* Quick check for dirtiness. For already dirty blocks, this
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* reduces runtime of this function by >90%, and overall performance
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* by 50% for some workloads (e.g. file deletion with indirect blocks
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* cached).
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* Quick check for dirtiness to improve performance for some workloads
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* (e.g. file deletion with indirect blocks cached).
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*/
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mutex_enter(&db->db_mtx);
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if (db->db_state == DB_CACHED || db->db_state == DB_NOFILL) {
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dbuf_dirty_record_t *dr = dbuf_find_dirty_eq(db, tx->tx_txg);
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/*
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* It's possible that it is already dirty but not cached,
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* It's possible that the dbuf is already dirty but not cached,
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* because there are some calls to dbuf_dirty() that don't
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* go through dmu_buf_will_dirty().
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*/
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dbuf_dirty_record_t *dr = dbuf_find_dirty_eq(db, tx->tx_txg);
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if (dr != NULL) {
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if (dr->dt.dl.dr_brtwrite) {
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if (db->db_level == 0 &&
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dr->dt.dl.dr_brtwrite) {
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/*
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* Block cloning: If we are dirtying a cloned
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* block, we cannot simply redirty it, because
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* this dr has no data associated with it.
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* level 0 block, we cannot simply redirty it,
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* because this dr has no associated data.
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* We will go through a full undirtying below,
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* before dirtying it again.
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*/
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